WO1999048594A1 - Installation for treating gas with adsorbent disc filter - Google Patents

Installation for treating gas with adsorbent disc filter Download PDF

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Publication number
WO1999048594A1
WO1999048594A1 PCT/FR1999/000660 FR9900660W WO9948594A1 WO 1999048594 A1 WO1999048594 A1 WO 1999048594A1 FR 9900660 W FR9900660 W FR 9900660W WO 9948594 A1 WO9948594 A1 WO 9948594A1
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WO
WIPO (PCT)
Prior art keywords
filter element
filter
gas
treated
gas flow
Prior art date
Application number
PCT/FR1999/000660
Other languages
French (fr)
Inventor
Vincent Delecroix
Original Assignee
Messier-Bugatti
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messier-Bugatti filed Critical Messier-Bugatti
Priority to JP2000537635A priority Critical patent/JP2002507477A/en
Priority to EP99909063A priority patent/EP1064076A1/en
Publication of WO1999048594A1 publication Critical patent/WO1999048594A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/26—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies rotatable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/704—Solvents not covered by groups B01D2257/702 - B01D2257/7027
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/93—Toxic compounds not provided for in groups B01D2257/00 - B01D2257/708
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
    • B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas

Definitions

  • the invention relates to a gas treatment installation using a rotary adsorbent filter.
  • Such an installation can be used for filtration and / or concentration purposes, for example for the treatment of a flow of air charged with molecules in order to produce a flow of purified air after adsorption of these molecules and / or a flow air in which the concentration of molecules is increased.
  • document US 5,584,916-A- shows a rotor containing an adsorbent material forming a filter, in this case an artificial zeolite.
  • a rotor containing an adsorbent material forming a filter, in this case an artificial zeolite.
  • a treatment zone receiving a gas flow to be treated charged with an organic solvent and delivering a purified gas flow
  • a regeneration zone receiving a stream of hot air and delivering air charged with desorbed solvent.
  • the gas flow to be treated and the desorption air stream pass through the filter parallel to the axis of rotation.
  • the adsorbent material can be activated carbon.
  • the document JP 57-024616-A- shows a filter formed by a winding in superimposed layers of a complex formed by a flat sheet and a corrugated sheet, so as to provide passages for the gas flow to be treated and for the desorption air stream parallel to the axis of rotation.
  • One of the sheets comprises fine particles of activated carbon and the heating of the filter in the desorption zone is carried out by the Joule effect, by passing the filter between two electrodes in the form of grids on which the lateral faces of the filter rub.
  • Document JP 53-050067-A- is also known, which mentions the use of activated carbon in fibrous form for the adsorbent material of the rotary filter.
  • the object of the invention is to provide a gas treatment installation comprising a rotary adsorbent filter, the production and continuous regeneration of which can be carried out in a simple manner and provide high efficiency.
  • a gas treatment installation comprising at least one rotary filter which comprises: an adsorbent filter element comprising activated carbon fibers, means for supplying a gas flow to be treated on one side of the filter element, a first gas outlet for collecting the gas flow having passed through the filter element in an adsorption zone corresponding to a first part of the rotary path of the filter, means for regenerating the filter element in a desorption zone corresponding to a second part of the rotary path of the filter, distinct from the first part, and a second gas outlet for collecting a gas stream having passed through the filter element in the desorption zone, installation in which: the filter element is formed by at least one layer of activated carbon fabric describing a cylindrical surface around the axis of rotation of the filter; the means for supplying a gas flow to be treated opening in a volume
  • the use of an activated carbon fabric to produce the filter element is particularly advantageous.
  • the fabric intrinsically has the mechanical resistance necessary to give the filtering element the necessary resistance while ensuring the adsorption function while being traversed by the gas flow to be treated.
  • the electrical conduction properties of a carbon fiber fabric make it particularly suitable for Joule heating during regeneration.
  • the cylindrical surface of the filter element has undulations in order to increase the surface of exchange with the gas flow to be treated.
  • the electrical supply of the fraction of the filter element located in the desorption zone is carried out by rubbing contact with supply electrodes.
  • the means for supplying a gas flow to be treated communicate with one side of the filter element in the adsorption zone and in the desorption zone, so that the current gaseous collected on the second gas outlet consists of a fraction of the gaseous flow to be treated enriched by elements desorbed from the filter element.
  • the installation then operates simultaneously as a filter by eliminating by adsorption of the elements contained in part of the gas flow to be treated and as an enrichment device, by increasing by desorption the concentration of the rest of the gas flow in elements that it contains .
  • the means for supplying a gas flow to be treated communicate with one side of the filter element in the adsorption zone only, and additional means for supplying a gas streams are provided, which communicate with one side of the filter element in the desorption zone only.
  • the drive of the desorbed elements is carried out by a gas stream distinct from the gas stream to be treated.
  • Figure 2 a longitudinal sectional view of the filter of the installation of Figure 1;
  • Figure 3 a cross-sectional view of the filter of the installation of Figure 1;
  • FIG. 5 a detail view in cross section of regeneration zone of the filter of Figure 3;
  • - Figure 6 a very schematic view of an installation comprising several rotary filters mounted in cascade;
  • FIG. 7 a very schematic view of a gas treatment installation according to a second embodiment of the invention
  • FIG. 8 a perspective view of partitioning means between adsorption zone and desorption zone in the installation of Figure 7;
  • a rotary filter 10 receives a gas flow to be treated brought by a pipe 12, for example air charged with toxic molecules coming from a room.
  • the purified air is collected by a first pipe 14, on a first outlet of the filter 10, for example to be returned to the room where the air to be purified has been taken.
  • Air with an increased content of toxic molecules is collected through a second line 16, on a second outlet of the filter 10, to be conveyed, for example, to a recovery or treatment device.
  • the rotary filter 10 comprises a filter element 20 (FIGS. 2, 3) driven in rotation inside a fixed casing 40.
  • the filter element 20 consists of activated carbon fabric. This can be obtained by carbonization of a fabric of carbon precursor, then activation.
  • a process for obtaining activated carbon fabric by carbonization of rayon fabric and activation for example by carbon dioxide, water vapor or air at a temperature of 600 ° C to 1000 ° C is described in document FR 2 741 3636-A-.
  • Another process for obtaining activated texture in carbon fibers is described in document WO 98/41678-A.
  • a fabric preferably having an electrical resistance between 0 and 100 ⁇ / D and a tensile strength at least equal to 0.5 daN / cm will be chosen so that it can be handled without tearing.
  • the filter element 20 is mounted on a support structure comprising a plurality of bars 22a, 22b which extend parallel to the axis 11 of rotation of the rotary filter while being regularly distributed around it.
  • the bars 22a, 22b are arranged respectively in two outer and inner rings of different diameters.
  • the activated carbon fabric is mounted on the bars 22a, 22b, in one or more superimposed layers, passing alternately around a bar 22a of the outer ring and around a bar 22b of the inner ring.
  • the filter element 20 describes a cylindrical surface with an axis 11 forming regular undulations.
  • the filter element thus has a star-shaped profile. In the example illustrated, the number of undulations is equal to 12; it could of course be different.
  • the activated carbon fabric is held in place on the bars 22a by means of rubber pieces 24 in the form of half-tubes which are engaged on the fabric and the bars as shown in FIG. 4.
  • the bars 22a, 22b are mounted between two plates 26, 28 perpendicular to the axis 11.
  • One (26) of the plates has a central opening in which a hub 30 is mounted.
  • the latter has a flange 30a which s presses on the external face of the plate 26 and is extended outwards by a tubular part 30b.
  • An axis 32 passes axially through the hub 30 and the opposite plate 28 to allow the assembly of the plates 26, 28 and the bars 22a, 22b by screwing on the axis 32.
  • the plates 26, 28 have a central part more large thickness projecting from the inside and forming cylindrical notches 26a, 28a of the same diameter.
  • Parts 34 in the form of wedges are mounted against the internal faces of the plates 26, 28 between the recesses 26a, 28a and the periphery of the plates.
  • the parts 34 are slightly spaced from each other in the circumferential direction.
  • Each piece 34 has an outer rim 34a which covers the peripheral edge of the corresponding plate.
  • the parts 34 are in number equal to that of the bars 22b forming the inner ring of bars.
  • Each bar 22b has ends of reduced diameter which penetrate into orifices formed in the vicinity of the internal end of rounded shape of a respective part 34.
  • the bars 22b and the parts 34 are, on the internal side, tangent to the same surface cylindrical substantially coincident with that of the recesses 26a, 28a.
  • the bars 22a forming the outer ring each pass between two neighboring pieces 34. They have ends of reduced diameter which penetrate into holes formed in the plates 26, 28 protruding slightly from the external face of the plate 26.
  • the fabric forming the filter element 20 has a width greater than the distance between the central parts plates 26, 28, so that the edges of the fabric, at the level where it passes around the bars 22b, bear on the recesses 26a, 28a.
  • the parts 34 are fixed to the plates 26, 28 by means of screws 36 which press on the edges 34a of the parts 34 in the direction of the periphery of the plates 26, 28 (a single screw 36 is shown in FIG. 3).
  • screws 36 which press on the edges 34a of the parts 34 in the direction of the periphery of the plates 26, 28 (a single screw 36 is shown in FIG. 3).
  • the edges of the filter element are applied with pressure to the surfaces of the recesses 26a, 28a.
  • Spacers 38 parallel to the axis 11 help to maintain the parts 34 applied against the plates 26, 28 in the vicinity of their periphery.
  • the casing 40 comprises a cylindrical ferrule 42 surrounding the rotary filter, closed by two flanges 46, 48.
  • the flanges 46, 48 support the rotary filter by means of bearings in which are mounted the tubular part 30b of the hub 30 and the end part of the axis 32 projecting beyond the plate 28.
  • the tubular part 30b of the hub 30 is connected to the pipe 12 for supplying the gas flow to be treated and openings 30c are made without the hub 30, around the axis 32, to communicate the central part of the rotary filter 10, on the internal side of the filter element 20, with the pipe 12.
  • the axis 32 extends to the outside of the flange 48 of the casing 40 to be connected to a motor 50 for driving the rotary filter (FIG. 1).
  • the ferrule 42 of the envelope 40 is provided with two neighboring sealing seats 52, 54 which each extend over the entire length of the envelope but over a limited sector, providing an internal surface 52a, 54a of reduced radius ( Figures 3, 5). This radius is determined to allow, by contact between the surfaces 52a, 54a and the rubber pieces 24 lining the bars 22a ( Figure 4), to share in a sealed manner the volume located between the external side of the filter element and the ferrule 42 of envelope 40.
  • this volume is shared between a first volume A which communicates with the first outlet 56 of the filter connected to line 14, and a second volume B which communicates with the second outlet 58 of the filter connected to line 16
  • the second outlet 58 of the filter is formed through the ferrule 42 between the ends closest to the sealing seats 52, 54, while the first outlet 56 of the filter is formed through the ferrule 42 substantially opposite to the first outing.
  • the flange 46 is provided with electrodes 62, 64 which each extend over a limited sector slightly less than the angular distance between two bars 22a (FIGS. 3, 5).
  • the electrodes 62, 64 project towards the inside of the envelope so as to come into frictional contact with the ends of the bars 22a which project through the plate 26, when the rotary filter rotates.
  • the electrodes 62, 64 are connected to a source of electrical power 66, outside of the envelope 40 (FIG. 1).
  • the operation of the installation described above is as follows.
  • the gas flow to be treated is admitted into the central part of the rotary filter 10 through the line 12 and the orifices 30c and is forced to pass through the filter element 20 between its internal side or face and its external side or face.
  • the smallest part of the filter element located between the bars 22a in contact with the electrodes 62, 64 undergoes heating by Joule effect causing desorption. In this way, the fraction of gas flow passing through this part of the filter element is charged with desorbed molecules and arrives in volume B from where it is evacuated through outlet 16.
  • the rest of the filter element acts as an adsorbent element.
  • the largest fraction of the gas flow passing through the rest of the filter element is purified and reaches the volume A from where it is evacuated through the outlet 14.
  • the rotary filter successively passes through a treatment zone (adsorption) which extends between the ends furthest from the sealing seats 52, 54, and a regeneration zone (desorption) which extends between the upstream end (in the direction of rotation of the filter) of the sealing part 52 (the first encountered) and the upstream end of sealing part 54.
  • the speed of rotation of the filter is chosen in particular as a function of the degree of pollution of the gas flow to be treated.
  • the filter is rotated continuously or step by step.
  • Figure 5 shows more particularly the arrangements and dimensions of the sealing seats and electrodes.
  • the sealing seats 52, 54 are located on either side of the meridian plane P passing through the axis of the outlet 58 and extend to the immediate vicinity thereof.
  • the electrodes 62, 64 are also located on either side of the plane P while being spaced slightly apart from one another.
  • the sealing seat 52 has a surface 52a which extends over an arc slightly smaller than that separating two consecutive bars 22a, that is to say two consecutive external vertices of the filter element. In this way, the surface 52a is in contact with only one vertex of the filter element.
  • the upstream end of the surface 52a in the direction of rotation of the filter, therefore marks a limit between the adsorption zone and the regeneration zone.
  • the electrodes 62, 64 extend over the arcs which are substantially equal and slightly lower than that separating two consecutive vertices of the filter element.
  • the upstream end of the electrode 62 is slightly downstream from that of the sealing seat 52 and the angular pitch between the electrodes is chosen to be substantially equal to that separating two consecutive vertices of the filter element.
  • an apex Si of the filter element comes into contact with the electrode 62, after contact with the sealing seat 52, and substantially at the same time as the next apex, S 2 of the filter element (in the direction of rotation R) comes into contact with the electrode 64, which starts the heating of the part of the filter element situated between these two vertices (shown in short dashes in FIG. 5).
  • the sealing seat 54 extends over an arc slightly greater than that separating two consecutive vertices of the filter element. In this way, after the top S 2 of the filter element has left the electrode 62 and the sealing seat 52 and has come into contact with the upstream end of the sealing seat 54, the part of the filter element located between this top and the next top S 3 in the direction of rotation R (part shown in long dashes in FIG. 5) is temporarily inactive, the two tops which border it being in simultaneous contact with the sealing seat 54 This allows this part of the filter element to cool before entering the adsorption zone, as soon as the top S 3 leaves the sealing seat 54.
  • a particular advantage resulting from the use of an activated carbon fabric heated by the Joule effect lies in the rapidity of its heating and cooling. It is therefore not necessary for the sealing seat 54 to extend over a large arc, which makes it possible to optimize the adsorption zone.
  • the fraction of the filter element during regeneration is between two consecutive vertices.
  • the fraction being regenerated may extend between two non-consecutive peaks.
  • the temperature obtained for a fraction of filter element varies from 70 ° C to 170 ° C when a voltage is applied varying from 12 V to 24 V, the adjacent fractions remaining at room temperature of 25 ° C.
  • the rate of temperature rise after application of the voltage is approximately 20 ° C / min. Cooling is faster, especially under the effect of the incoming gas flow.
  • FIG. 6 schematically illustrates an installation in which several rotary filters 10, similar for example to that described above, are placed in cascade, the second outlet pipe 16 of a filter being connected to the supply pipe 12 of the filter next.
  • Such an installation makes it possible to gradually enrich the concentration of the gas flow in the elements which it contains. It can in particular be used for the treatment of gas streams containing solvent molecules. The gradual increase in concentration facilitates the final recovery of the solvent.
  • Figures 7 to 10 illustrate another embodiment of an installation according to the invention, which differs from that of Figures 1 to 5 in that the desorption is carried out using a gas stream separate from the gas stream to be treated.
  • Such an embodiment may be preferred in the case where the enrichment of the gas flow to be treated with elements which it contains has drawbacks. This is so when these elements represent a danger at high concentration, which is for example the case for certain types of solvents with which a risk of explosion exists beyond a certain concentration threshold in the air.
  • FIGS. 7 to 10 The installation of FIGS. 7 to 10 comprises a rotary filter 10 receiving a gaseous flow to be treated supplied by a line 12, for example air loaded with solvent molecules.
  • the purified air after adsorption is 11
  • the desorbed molecules are entrained by a gas current brought by a pipe 70 to a second outlet of the filter, then through a pipe 72, to be conveyed, for example, to a recovery or disposal device.
  • the gas stream supplied via line 70 can be air or a neutral gas, for example nitrogen.
  • the rotary filter comprises a filter element 20 driven in rotation inside a fixed casing 40.
  • the filter element is, as in the previous embodiment, constituted by an activated carbon fabric.
  • the activated carbon fabric is mounted on bars 22a, 22b, parallel to the axis 11 of rotation of the rotary filter, in one or more superimposed layers.
  • the bars 22a, 22b are arranged in two outer and inner rings so that the carbon fabric, passing alternately around a bar 22a and a bar 22b, describes a cylindrical surface forming undulations.
  • the bars are held between two lateral or flange plates 26, 28 perpendicular to the axis 11.
  • the ends of reduced diameter of the bars 22a, 22b penetrate into orifices formed in wedge-shaped pieces 34 which are fixed to the plates 26 , 28 and apply the fabric 20 in a leaktight manner to recesses 26a, 28a of the plates 26, 28.
  • the casing 40 comprises a cylindrical ferrule 42 surrounding the rotary filter, closed by two flanges 46, 48.
  • the flange 46 is integral with a rod 80 which passes axially through the rotary filter. This is supported in rotation on the fixed rod 80 by means of bearings at the level of central openings of the plates 26, 28.
  • the plate 28 has a central cylindrical part 28b which projects outwards through a central passage formed in the flange 48, the cylindrical part 28b being supported by the flange 48 forming a bearing. Outside the envelope 40, the cylindrical part 28b is coupled to a motor 50 for driving the filter in rotation.
  • the gas flow to be treated brought by the pipe 12 enters the volume A located on the internal side of the filter element through an orifice 46a formed in the flange 46 in the vicinity of its central part, and through orifices 26c formed in the flange 26, around axis 11. 12
  • the gas stream carrying the desorbed molecules passes through orifices 28c formed in the plate 28 and an orifice 48c formed in the flange 48 and connecting to the pipe 72.
  • the orifices 28c and 48c are located at a distance from the axis 11 lower than that separating this axis from the bars 22b over which the fabric 20 passes.
  • the ferrule 42 is provided with neighboring sealing seats 52, 54 which allow, by contact with the external generators of the bars 22a over which the fabric 20 passes, to share in a leaktight manner the volume situated between the external side of the filter element and the ferrule 42.
  • the flange 46 is provided with electrodes 62, 64 connected to an external electrical power source and on which the ends of the bars 22a projecting through the plate 26 can come in rubbing contact.
  • the volume between the outer side of the filter element 10 and the shell 42 is shared, by the sealing seats 52, 54, between a first volume A, which communicates with the first outlet 56 of the filter connected to line 14, and a second volume B, which communicates with the second outlet of the filter connected to line 72, as well as with a second inlet 59 of the filter connected to line 70.
  • the second inlet 59 is formed through the ferrule 42 between the closest ends of the sealing seats 52, 54.
  • partitioning means are provided, carried by the rod 80, to isolate the desorption zone from the adsorption zone on the internal side of the filter element 20.
  • These partitioning means (FIGS. 8 to 10) comprising two partitions 81 , 83 which extend radially from the rod 80 and which form between them an acute angle ⁇ defining the angle along which the desorption zone extends.
  • the partitions 81, 83 support sealing walls 82, 84 in the form of cylinder segments of axis 11.
  • the walls 82, 84 are located at the level of the internal generatrices of the bars 22b of the inner ring on which pass the fabric 20.
  • the outside diameter of the walls 82, 84 is 13
  • the walls 82, 84 extend over a distance substantially equal to, or very slightly greater than, that separating the internal generatrices of two consecutive bars 22b, while providing an interval between them.
  • the angular positions of the walls 82, 84 correspond approximately to those of the sealing seats 52, 54, so that, when two consecutive external bars 22a are in contact with the same sealing seat 52 or 54, the intermediate internal bar is in contact with the wall 82 or 84, and that, when two consecutive internal bars 22b are in contact with the same wall 82 or 84, the intermediate external bar is in contact with the sealing seat 52 or 54.
  • the partitions 81, 83 extend axially over the entire length of the rotary filter. At their end adjacent to the plate 26, the partitions 81, 83 are connected by a transverse wall 86 which closes the orifices 26c when these occupy an angular position situated between that of the partitions 81 and 83, during the rotation of the filter.
  • transverse obturating wall 88 in the form of a crown sector, is carried by the flange 48 to close the orifices 28c when these occupy an angular position other than situated between the partitions 81 and 83, during the rotation of the filter.
  • the partitions 81, 83, with the obturating walls 86, 88 define, with the internal side of the filtering element, a volume C from which the gas flow to be treated can only escape through the filter element and only towards volume A (adsorption zone). There is no communication between volume C receiving the gas stream to be treated and volume B where desorption occurs.
  • FIGS. 9 and 10 the parts of the filter element undergoing heating by Joule effect in the desorption zone are shown in broken lines.
  • the pressure P1 in the volume A is at least equal to or greater than the pressure P2 prevailing in the volume B connected to the second inlet and the second outlet of the filter.
  • the obturator wall 86 prevents the gas flow to be treated from accessing the volume B where the desorption occurs, while the obturator wall 88 prevents the gas flow to be treated from escaping directly through the second outlet 59 of the filter.

Abstract

The invention concerns an installation comprising at least a disc filter including: an activated carbon fabric adsorbent filtering element (20), means (30c) for supplying a gas stream to be treated on one side of the filter element, a first gas outlet (14) for collecting the gas stream which has passed through the filtering element in an adsorption zone corresponding to a first part of the filter rotating path, a second gas outlet (16) for collecting the gas stream which has passed through the filtering element in a desorption zone corresponding to a second part of the filter rotating path and power supply means (62, 64) for the filtering element fraction located in the desorption zone to heat and regenerate said filtering element fraction by Joule effect. The filtering element describes a cylindrical surface, advantageously undulating, about the filter axis of rotation.

Description

Installation de traitement de gaz par filtre rotatif adsorbant. Gas treatment installation by rotary adsorbent filter.
Domaine de l'inventionField of the invention
L'invention concerne une installation de traitement de gaz par filtre rotatif adsorbant.The invention relates to a gas treatment installation using a rotary adsorbent filter.
Une telle installation est utilisable à des fins de filtration et/ou de concentration, par exemple pour le traitement d'un flux d'air chargé de molécules afin de produire un flux d'air épuré après adsorption de ces molécules et/ou un flux d'air dans lequel la concentration en molécules est augmentée.Such an installation can be used for filtration and / or concentration purposes, for example for the treatment of a flow of air charged with molecules in order to produce a flow of purified air after adsorption of these molecules and / or a flow air in which the concentration of molecules is increased.
Arrière-plan de l'inventionInvention background
Des dispositifs de traitement de gaz utilisant un filtre rotatif fonctionnant alternativement en adsorption et en desorption au cours d'un tour complet sont bien connus.Gas treatment devices using a rotary filter operating alternately in adsorption and desorption during a complete revolution are well known.
Ainsi, le document US 5 584 916-A- montre un rotor contenant un matériau adsorbant formant filtre, en l'espèce une zéolithe artificielle. Pendant chaque rotation complète du filtre, celui-ci traverse une zone de traitement recevant un flux gazeux à traiter chargé d'un solvant organique et délivrant un flux gazeux épuré, puis une zone de régénération recevant un courant d'air chaud et délivrant un air chargé de solvant désorbé. Le flux gazeux à traiter et le courant d'air de desorption traversent le filtre parallèlement à l'axe de rotation.Thus, document US 5,584,916-A- shows a rotor containing an adsorbent material forming a filter, in this case an artificial zeolite. During each complete rotation of the filter, it passes through a treatment zone receiving a gas flow to be treated charged with an organic solvent and delivering a purified gas flow, then a regeneration zone receiving a stream of hot air and delivering air charged with desorbed solvent. The gas flow to be treated and the desorption air stream pass through the filter parallel to the axis of rotation.
Selon d'autres documents relatifs à des dispositifs adsorbants rotatifs, le matériau adsorbant peut être du carbone activé.According to other documents relating to rotary adsorbent devices, the adsorbent material can be activated carbon.
Ainsi, le document JP 57-024616-A- montre un filtre formé par un enroulement en couches superposées d'un complexe formé d'une feuille plate et d'une feuille ondulée, de manière à ménager des passages pour le flux gazeux à traiter et pour le courant d'air de desorption parallèlement à l'axe de rotation. L'une des feuilles comprend des fines particules de charbon actif et le chauffage du filtre dans la zone de desorption est réalisé par effet Joule, en faisant passer le filtre entre deux électrodes en forme de grillages sur lesquelles frottent les faces latérales du filtre. On connaît aussi le document JP 53-050067-A- qui évoque l'utilisation de carbone activé sous forme fibreuse pour le matériau adsorbant du filtre rotatif.Thus, the document JP 57-024616-A- shows a filter formed by a winding in superimposed layers of a complex formed by a flat sheet and a corrugated sheet, so as to provide passages for the gas flow to be treated and for the desorption air stream parallel to the axis of rotation. One of the sheets comprises fine particles of activated carbon and the heating of the filter in the desorption zone is carried out by the Joule effect, by passing the filter between two electrodes in the form of grids on which the lateral faces of the filter rub. Document JP 53-050067-A- is also known, which mentions the use of activated carbon in fibrous form for the adsorbent material of the rotary filter.
Obiet et résumé de l'inventionObject and summary of the invention
L'invention a pour but de fournir une installation de traitement de gaz comprenant un filtre adsorbant rotatif dont la réalisation et la régénération en continu peuvent être réalisées de façon simple et apporter une grande efficacité. Ce but est atteint avec une installation de traitement de gaz comprenant au moins un filtre rotatif qui comporte : un élément filtrant adsorbant comprenant des fibres de carbone activé, des moyens d'amenée d'un flux gazeux à traiter d'un côté de l'élément filtrant, une première sortie de gaz pour recueillir le flux gazeux ayant traversé l'élément filtrant dans une zone d'adsorption correspondant à une première partie du trajet rotatif du filtre, des moyens de régénération de l'élément filtrant dans une zone de desorption correspondant à une deuxième partie du trajet rotatif du filtre, distincte de la première partie, et une deuxième sortie de gaz pour recueillir un courant gazeux ayant traversé l'élément filtrant dans la zone de desorption, installation dans laquelle : l'élément filtrant est formé par au moins une couche de tissu de carbone activé décrivant une surface cylindrique autour de l'axe de rotation du filtre ; les moyens d'amenée d'un flux gazeux à traiter s'ouvrant dans un volume situé d'un côté de l'élément filtrant, tandis que la première sortie de gaz s'ouvre dans un volume situé de l'autre côté de l'élément filtrant ; et les moyens de régénération comprennent des moyens d'alimentation électrique d'une fraction de l'élément filtrant située dans la zone de desorption afin de réaliser un échauffement de cette fraction de l'élément filtrant par effet Joule.The object of the invention is to provide a gas treatment installation comprising a rotary adsorbent filter, the production and continuous regeneration of which can be carried out in a simple manner and provide high efficiency. This object is achieved with a gas treatment installation comprising at least one rotary filter which comprises: an adsorbent filter element comprising activated carbon fibers, means for supplying a gas flow to be treated on one side of the filter element, a first gas outlet for collecting the gas flow having passed through the filter element in an adsorption zone corresponding to a first part of the rotary path of the filter, means for regenerating the filter element in a desorption zone corresponding to a second part of the rotary path of the filter, distinct from the first part, and a second gas outlet for collecting a gas stream having passed through the filter element in the desorption zone, installation in which: the filter element is formed by at least one layer of activated carbon fabric describing a cylindrical surface around the axis of rotation of the filter; the means for supplying a gas flow to be treated opening in a volume located on one side of the filter element, while the first gas outlet opens in a volume located on the other side of the 'filter element; and the regeneration means comprise means for electrically supplying a fraction of the filtering element situated in the desorption zone in order to heat up this fraction of the filtering element by the Joule effect.
L'utilisation d'un tissu de carbone activé pour réaliser l'élément filtrant est particulièrement avantageuse. Le tissu possède intrinsèquement la résistance mécanique nécessaire pour donner à l'élément filtrant la tenue nécessaire tout en assurant la fonction d'adsorption en étant traversé par le flux gazeux à traiter. En outre, les propriétés de conduction électrique d'un tissu en fibres de carbone le rendent particulièrement apte à un chauffage par effet Joule lors de la régénération.The use of an activated carbon fabric to produce the filter element is particularly advantageous. The fabric intrinsically has the mechanical resistance necessary to give the filtering element the necessary resistance while ensuring the adsorption function while being traversed by the gas flow to be treated. In addition, the electrical conduction properties of a carbon fiber fabric make it particularly suitable for Joule heating during regeneration.
Avantageusement, la surface cylindrique de l'élément filtrant présente des ondulations afin d'augmenter la surface d'échange avec le flux gazeux à traiter.Advantageously, the cylindrical surface of the filter element has undulations in order to increase the surface of exchange with the gas flow to be treated.
Selon une autre particularité de l'installation, l'alimentation électrique de la fraction de l'élément filtrant située dans la zone de desorption est réalisée par contact frottant avec des électrodes d'alimentation. Selon un premier mode de réalisation de l'installation, les moyens d'amenée d'un flux gazeux à traiter communiquent avec un côté de l'élément filtrant dans la zone d'adsorption et dans la zone de desorption, de sorte que le courant gazeux recueilli sur la deuxième sortie de gaz est constitué par une fraction du flux gazeux à traiter enrichi par des éléments désorbés de l'élément filtrant.According to another particular feature of the installation, the electrical supply of the fraction of the filter element located in the desorption zone is carried out by rubbing contact with supply electrodes. According to a first embodiment of the installation, the means for supplying a gas flow to be treated communicate with one side of the filter element in the adsorption zone and in the desorption zone, so that the current gaseous collected on the second gas outlet consists of a fraction of the gaseous flow to be treated enriched by elements desorbed from the filter element.
Ainsi, c'est une fraction du flux gazeux à traiter qui est utilisée comme courant gazeux d'entraînement des éléments désorbés de l'élément filtrant. Il n'est alors pas nécessaire de faire appel à un courant gazeux de desorption particulier. En outre, l'installation fonctionne alors simultanément comme filtre en éliminant par adsorption des éléments contenus dans une partie du flux gazeux à traiter et comme dispositif d'enrichissement, en augmentant par desorption la concentration du reste du flux gazeux en éléments qu'il contient.Thus, it is a fraction of the gas stream to be treated which is used as the gaseous stream for driving the desorbed elements of the filter element. It is then not necessary to use a particular desorption gas stream. In addition, the installation then operates simultaneously as a filter by eliminating by adsorption of the elements contained in part of the gas flow to be treated and as an enrichment device, by increasing by desorption the concentration of the rest of the gas flow in elements that it contains .
La disposition de plusieurs filtres rotatifs en cascade permet alors une multiplication de cette concentration.The arrangement of several rotary filters in cascade then allows a multiplication of this concentration.
Selon un deuxième mode de réalisation de l'installation, les moyens d'amenée d'un flux gazeux à traiter communiquent avec un côté de l'élément filtrant dans la zone d'adsorption seulement, et des moyens supplémentaires d'amenée d'un courant gazeux sont prévus, qui communiquent avec un côté de l'élément filtrant dans la zone de desorption seulement. Ainsi, l'entraînement des éléments désorbés est réalisé par un courant gazeux distinct du flux gazeux à traiter. Brève description des dessinsAccording to a second embodiment of the installation, the means for supplying a gas flow to be treated communicate with one side of the filter element in the adsorption zone only, and additional means for supplying a gas streams are provided, which communicate with one side of the filter element in the desorption zone only. Thus, the drive of the desorbed elements is carried out by a gas stream distinct from the gas stream to be treated. Brief description of the drawings
L'invention sera mieux comprise à la lecture de la description faite ci-après, à titre indicatif mais non limitatif, en référence aux dessins annexés qui illustrent : - figure 1 : une vue très schématique d'une installation de traitement de gaz selon un premier mode de réalisation de l'invention ;The invention will be better understood on reading the description given below, by way of indication but not limitation, with reference to the appended drawings which illustrate: - Figure 1: a very schematic view of a gas treatment installation according to a first embodiment of the invention;
- figure 2 : une vue en coupe longitudinale du filtre de l'installation de la figure 1 ;- Figure 2: a longitudinal sectional view of the filter of the installation of Figure 1;
- figure 3 : une vue en coupe transversale du filtre de l'installation de la figure 1 ;- Figure 3: a cross-sectional view of the filter of the installation of Figure 1;
- figure 4 : une vue de détail du montage de l'élément filtrant en tissu sur un barreau de support ;- Figure 4: a detailed view of the mounting of the fabric filter element on a support bar;
- figure 5 : une vue de détail en coupe transversale de zone de régénération du filtre de la figure 3 ; - figure 6 : une vue très schématique d'une installation comprenant plusieurs filtres rotatifs montés en cascade ;- Figure 5: a detail view in cross section of regeneration zone of the filter of Figure 3; - Figure 6: a very schematic view of an installation comprising several rotary filters mounted in cascade;
- figure 7 : une vue très schématique d'une installation de traitement de gaz selon un deuxième mode de réalisation de l'invention ; - figure 8 : une vue en perspective de moyens de cloisonnement entre zone d'adsorption et zone de desorption dans l'installation de la figure 7 ; et- Figure 7: a very schematic view of a gas treatment installation according to a second embodiment of the invention; - Figure 8: a perspective view of partitioning means between adsorption zone and desorption zone in the installation of Figure 7; and
- figures 9 et 10 : deux vues en coupe transversale du filtre de l'installation de la figure 7, dans deux positions angulaires différentes.- Figures 9 and 10: two cross-sectional views of the filter of the installation of Figure 7, in two different angular positions.
Description détaillée de modes préférés de réalisationDetailed description of preferred embodiments
Dans l'installation de la figure 1 , un filtre rotatif 10 reçoit un flux gazeux à traiter amené par une conduite 12, par exemple de l'air chargé de molécules toxiques provenant d'un local. L'air épuré est recueilli par une première conduite 14, sur une première sortie du filtre 10, par exemple pour être renvoyé dans le local où l'air à épurer a été prélevé. De l'air à teneur accrue en molécules toxiques est recueilli par une deuxième conduite 16, sur une deuxième sortie du filtre 10, pour être acheminé, par exemple, vers un dispositif de récupération ou de traitement. Le filtre rotatif 10 comprend un élément filtrant 20 (figures 2, 3) entraîné en rotation à l'intérieur d'une enveloppe fixe 40. L'élément filtrant 20 est constitué par du tissu de carbone activé. Celui-ci peut être obtenu par carbonisation d'un tissu de précurseur de carbone, puis activation. Un procédé d'obtention de tissu de carbone activé par carbonisation d'un tissu de rayonne et activation par exemple par du dioxyde de carbone, de la vapeur d'eau ou de l'air à une température de 600°C à 1000°C est décrit dans le document FR 2 741 3636-A-. Un autre procédé d'obtention de texture activée en fibres de carbone est décrit dans le document WO 98/41678-A. On choisira de préférence un tissu ayant une résistance électrique comprise entre 0 et 100 Ω/D et une résistance à rupture en traction au moins égale à 0,5 daN/cm pour pouvoir être manipulé sans déchirement.In the installation of FIG. 1, a rotary filter 10 receives a gas flow to be treated brought by a pipe 12, for example air charged with toxic molecules coming from a room. The purified air is collected by a first pipe 14, on a first outlet of the filter 10, for example to be returned to the room where the air to be purified has been taken. Air with an increased content of toxic molecules is collected through a second line 16, on a second outlet of the filter 10, to be conveyed, for example, to a recovery or treatment device. The rotary filter 10 comprises a filter element 20 (FIGS. 2, 3) driven in rotation inside a fixed casing 40. The filter element 20 consists of activated carbon fabric. This can be obtained by carbonization of a fabric of carbon precursor, then activation. A process for obtaining activated carbon fabric by carbonization of rayon fabric and activation for example by carbon dioxide, water vapor or air at a temperature of 600 ° C to 1000 ° C is described in document FR 2 741 3636-A-. Another process for obtaining activated texture in carbon fibers is described in document WO 98/41678-A. A fabric preferably having an electrical resistance between 0 and 100 Ω / D and a tensile strength at least equal to 0.5 daN / cm will be chosen so that it can be handled without tearing.
L'élément filtrant 20 est monté sur une structure de support comportant une pluralité de barreaux 22a, 22b qui s'étendent parallèlement à l'axe 11 de rotation du filtre rotatif en étant répartis régulièrement autour de celui-ci. Les barreaux 22a, 22b sont disposés respectivement en deux couronnes extérieure et intérieure de diamètres différents. Le tissu de carbone activé est monté sur les barreaux 22a, 22b, en une ou plusieurs couches superposées, en passant alternativement autour d'un barreau 22a de la couronne extérieure et autour d'un barreau 22b de la couronne intérieure. De la sorte, l'élément filtrant 20 décrit une surface cylindrique d'axe 11 formant des ondulations régulières. En coupe transversale (figure 3), l'élément filtrant a ainsi un profil en forme d'étoile. Dans l'exemple illustré, le nombre d'ondulations est égal à 12 ; il pourrait bien entendu être différent. Le tissu de carbone activé est maintenu en place sur les barreaux 22a au moyen de pièces en caoutchouc 24 en forme de demi-tube qui sont engagées sur le tissu et les barreaux comme le montre la figure 4.The filter element 20 is mounted on a support structure comprising a plurality of bars 22a, 22b which extend parallel to the axis 11 of rotation of the rotary filter while being regularly distributed around it. The bars 22a, 22b are arranged respectively in two outer and inner rings of different diameters. The activated carbon fabric is mounted on the bars 22a, 22b, in one or more superimposed layers, passing alternately around a bar 22a of the outer ring and around a bar 22b of the inner ring. In this way, the filter element 20 describes a cylindrical surface with an axis 11 forming regular undulations. In cross section (Figure 3), the filter element thus has a star-shaped profile. In the example illustrated, the number of undulations is equal to 12; it could of course be different. The activated carbon fabric is held in place on the bars 22a by means of rubber pieces 24 in the form of half-tubes which are engaged on the fabric and the bars as shown in FIG. 4.
Les barreaux 22a, 22b sont montés entre deux plateaux 26, 28 perpendiculaires à l'axe 11. L'un (26) des plateaux présente une ouverture centrale dans laquelle est monté un moyeu 30. Celui-ci présente une collerette 30a qui s'appuie sur la face externe du plateau 26 et se prolonge vers l'extérieur par une partie tubulaire 30b. Un axe 32 traverse axialement le moyeu 30 et le plateau opposé 28 pour permettre l'assemblage des plateaux 26, 28 et des barreaux 22a, 22b par vissage sur l'axe 32. Les plateaux 26, 28 présentent une partie centrale de plus grande épaisseur faisant saillie du côté intérieur et formant des décrochements cylindriques 26a, 28a de même diamètre.The bars 22a, 22b are mounted between two plates 26, 28 perpendicular to the axis 11. One (26) of the plates has a central opening in which a hub 30 is mounted. The latter has a flange 30a which s presses on the external face of the plate 26 and is extended outwards by a tubular part 30b. An axis 32 passes axially through the hub 30 and the opposite plate 28 to allow the assembly of the plates 26, 28 and the bars 22a, 22b by screwing on the axis 32. The plates 26, 28 have a central part more large thickness projecting from the inside and forming cylindrical notches 26a, 28a of the same diameter.
Des pièces 34 en forme de coins (ou de secteurs de disque) sont montées contre les faces internes des plateaux 26, 28 entre les décrochements 26a, 28a et la périphérie des plateaux. Les pièces 34 sont légèrement espacées les unes des autres en direction circonférentielle. Chaque pièce 34 présente un rebord externe 34a qui recouvre le bord périphérique du plateau correspondant.Parts 34 in the form of wedges (or disc sectors) are mounted against the internal faces of the plates 26, 28 between the recesses 26a, 28a and the periphery of the plates. The parts 34 are slightly spaced from each other in the circumferential direction. Each piece 34 has an outer rim 34a which covers the peripheral edge of the corresponding plate.
Les pièces 34 sont en nombre égal à celui des barreaux 22b formant la couronne intérieure de barreaux. Chaque barreau 22b présente des extrémités de diamètre réduit qui pénètrent dans des orifices formés au voisinage de l'extrémité interne de forme arrondie d'une pièce respective 34. Les barreaux 22b et les pièces 34 sont, du côté interne, tangents à une même surface cylindrique sensiblement confondue avec celle des décrochements 26a, 28a.The parts 34 are in number equal to that of the bars 22b forming the inner ring of bars. Each bar 22b has ends of reduced diameter which penetrate into orifices formed in the vicinity of the internal end of rounded shape of a respective part 34. The bars 22b and the parts 34 are, on the internal side, tangent to the same surface cylindrical substantially coincident with that of the recesses 26a, 28a.
Les barreaux 22a formant la couronne extérieure passent chacun entre deux pièces 34 voisines. Ils présentent des extrémités de diamètre réduit qui pénètrent dans des trous formés dans les plateaux 26, 28 en faisant saillie légèrement à la face externe du plateau 26. Le tissu formant l'élément filtrant 20 a une largeur supérieure à la distance entre les parties centrales des plateaux 26, 28, de sorte que les bords du tissu, au niveau où celui-ci passe autour des barreaux 22b, s'appuient sur les décrochements 26a, 28a.The bars 22a forming the outer ring each pass between two neighboring pieces 34. They have ends of reduced diameter which penetrate into holes formed in the plates 26, 28 protruding slightly from the external face of the plate 26. The fabric forming the filter element 20 has a width greater than the distance between the central parts plates 26, 28, so that the edges of the fabric, at the level where it passes around the bars 22b, bear on the recesses 26a, 28a.
Les pièces 34 sont fixées aux plateaux 26, 28 au moyen de vis 36 qui appuient sur les rebords 34a des pièces 34 en direction de la périphérie des plateaux 26, 28 (une seule vis 36 est montrée sur la figure 3). De la sorte, les bords de l'élément filtrant sont appliqués avec pression sur les surfaces des décrochements 26a, 28a. Ainsi, toute communication entre le volume situé du côté interne de l'élément filtrant, au niveau de l'axe du filtre rotatif, et le volume situé du côté externe de l'élément filtrant ne peut se faire qu'à travers ce dernier. Des entretoises 38 parallèles à l'axe 11 contribuent à maintenir les pièces 34 appliquées contre les plateaux 26, 28 au voisinage de leur périphérie.The parts 34 are fixed to the plates 26, 28 by means of screws 36 which press on the edges 34a of the parts 34 in the direction of the periphery of the plates 26, 28 (a single screw 36 is shown in FIG. 3). In this way, the edges of the filter element are applied with pressure to the surfaces of the recesses 26a, 28a. Thus, any communication between the volume located on the internal side of the filter element, at the level of the axis of the rotary filter, and the volume located on the external side of the filter element can only take place through the latter. Spacers 38 parallel to the axis 11 help to maintain the parts 34 applied against the plates 26, 28 in the vicinity of their periphery.
L'enveloppe 40 comprend une virole cylindrique 42 entourant le filtre rotatif, fermée par deux flasques 46, 48. Les flasques 46, 48 supportent le filtre rotatif par l'intermédiaire de paliers dans lesquels sont montées la partie tubulaire 30b du moyeu 30 et la partie d'extrémité de l'axe 32 faisant saillie au-delà du plateau 28. La partie tubulaire 30b du moyeu 30 se raccorde à la conduite 12 d'amenée de flux gazeux à traiter et des ouvertures 30ç sont pratiquées sans le moyeu 30, autour de l'axe 32, pour faire communiquer la partie centrale du filtre rotatif 10, du côté interne de l'élément filtrant 20, avec la conduite 12. L'axe 32 se prolonge à l'extérieur du flasque 48 de l'enveloppe 40 pour être relié à un moteur 50 d'entraînement du filtre rotatif (figure 1 ).The casing 40 comprises a cylindrical ferrule 42 surrounding the rotary filter, closed by two flanges 46, 48. The flanges 46, 48 support the rotary filter by means of bearings in which are mounted the tubular part 30b of the hub 30 and the end part of the axis 32 projecting beyond the plate 28. The tubular part 30b of the hub 30 is connected to the pipe 12 for supplying the gas flow to be treated and openings 30c are made without the hub 30, around the axis 32, to communicate the central part of the rotary filter 10, on the internal side of the filter element 20, with the pipe 12. The axis 32 extends to the outside of the flange 48 of the casing 40 to be connected to a motor 50 for driving the rotary filter (FIG. 1).
Du côté interne, la virole 42 de l'enveloppe 40 est munie de deux sièges d'étanchéité voisins 52, 54 qui s'étendent chacun sur toute la longueur de l'enveloppe mais sur un secteur limité, en offrant une surface interne 52a, 54a de rayon réduit (figures 3, 5). Ce rayon est déterminé pour permettre, par contact entre les surfaces 52a, 54a et les pièces de caoutchouc 24 garnissant les barreaux 22a (figure 4), de partager de façon étanche le volume situé entre le côté externe de l'élément filtrant et la virole 42 de l'enveloppe 40.On the internal side, the ferrule 42 of the envelope 40 is provided with two neighboring sealing seats 52, 54 which each extend over the entire length of the envelope but over a limited sector, providing an internal surface 52a, 54a of reduced radius (Figures 3, 5). This radius is determined to allow, by contact between the surfaces 52a, 54a and the rubber pieces 24 lining the bars 22a (Figure 4), to share in a sealed manner the volume located between the external side of the filter element and the ferrule 42 of envelope 40.
Comme le montre la figure 3, ce volume est partagé entre un premier volume A qui communique avec la première sortie 56 du filtre reliée à la conduite 14, et un deuxième volume B qui communique avec la deuxième sortie 58 du filtre reliée à la conduite 16. La deuxième sortie 58 du filtre est formée à travers la virole 42 entre les extrémités les plus rapprochées des sièges d'étanchéité 52, 54, tandis que la première sortie 56 du filtre est formée à travers la virole 42 sensiblement à l'opposé de la première sortie. En outre, sensiblement au même niveau angulaire que les sièges d'étanchéité 52, 54, le flasque 46 est muni d'électrodes 62, 64 qui s'étendent chacune sur un secteur limité légèrement inférieur à la distance angulaire entre deux barreaux 22a (figures 3, 5). Les électrodes 62, 64 font saillie vers l'intérieur de l'enveloppe de manière à venir en contact frottant avec les extrémités des barreaux 22a qui font saillie à travers le plateau 26, lorsque le filtre rotatif tourne. Les électrodes 62, 64 sont reliées à une source d'alimentation électrique 66, à l'extérieur de l'enveloppe 40 (figure 1 ).As shown in Figure 3, this volume is shared between a first volume A which communicates with the first outlet 56 of the filter connected to line 14, and a second volume B which communicates with the second outlet 58 of the filter connected to line 16 The second outlet 58 of the filter is formed through the ferrule 42 between the ends closest to the sealing seats 52, 54, while the first outlet 56 of the filter is formed through the ferrule 42 substantially opposite to the first outing. In addition, at substantially the same angular level as the sealing seats 52, 54, the flange 46 is provided with electrodes 62, 64 which each extend over a limited sector slightly less than the angular distance between two bars 22a (FIGS. 3, 5). The electrodes 62, 64 project towards the inside of the envelope so as to come into frictional contact with the ends of the bars 22a which project through the plate 26, when the rotary filter rotates. The electrodes 62, 64 are connected to a source of electrical power 66, outside of the envelope 40 (FIG. 1).
Le fonctionnement de l'installation décrite ci-avant est le suivant. Le flux gazeux à traiter est admis dans la partie centrale du filtre rotatif 10 par la conduite 12 et les orifices 30ç et est contraint de traverser l'élément filtrant 20 entre son côté ou face interne et son côté ou face externe. La plus petite partie de l'élément filtrant située entre les barreaux 22a en contact avec les électrodes 62, 64 subit un échauffement par effet Joule provoquant une desorption. De la sorte, la fraction de flux gazeux traversant cette partie de l'élément filtrant se charge de molécules désorbées et parvient dans le volume B d'où elle est évacuée à travers la sortie 16.The operation of the installation described above is as follows. The gas flow to be treated is admitted into the central part of the rotary filter 10 through the line 12 and the orifices 30c and is forced to pass through the filter element 20 between its internal side or face and its external side or face. The smallest part of the filter element located between the bars 22a in contact with the electrodes 62, 64 undergoes heating by Joule effect causing desorption. In this way, the fraction of gas flow passing through this part of the filter element is charged with desorbed molecules and arrives in volume B from where it is evacuated through outlet 16.
Le reste de l'élément filtrant agit comme élément adsorbant. De la sorte, la plus grande fraction du flux gazeux traversant le reste de l'élément filtrant est épurée et parvient dans le volume A d'où elle est évacuée à travers la sortie 14. Ainsi, le filtre rotatif traverse successivement une zone de traitement (adsorption) qui s'étend entre les extrémités les plus éloignées des sièges d'étanchéité 52, 54, et une zone de régénération (desorption) qui s'étend entre l'extrémité amont (dans le sens de rotation du filtre) de la pièce d'étanchéité 52 (la première rencontrée) et l'extrémité amont de la pièce d'étanchéité 54. La vitesse de rotation du filtre est choisie notamment en fonction du degré de pollution du flux gazeux à traiter. Le filtre est entraîné en rotation de façon continue ou pas à pas.The rest of the filter element acts as an adsorbent element. In this way, the largest fraction of the gas flow passing through the rest of the filter element is purified and reaches the volume A from where it is evacuated through the outlet 14. Thus, the rotary filter successively passes through a treatment zone (adsorption) which extends between the ends furthest from the sealing seats 52, 54, and a regeneration zone (desorption) which extends between the upstream end (in the direction of rotation of the filter) of the sealing part 52 (the first encountered) and the upstream end of sealing part 54. The speed of rotation of the filter is chosen in particular as a function of the degree of pollution of the gas flow to be treated. The filter is rotated continuously or step by step.
La figure 5 montre plus particulièrement les dispositions et dimensions des sièges d'étanchéité et électrodes. Les sièges d'étanchéité 52, 54 sont situés de part et d'autre du plan méridien P passant par l'axe de la sortie 58 et s'étendent jusqu'à proximité immédiate de celle-ci. Les électrodes 62, 64 sont également situées de part et d'autre du plan P en étant faiblement espacées l'une de l'autre.Figure 5 shows more particularly the arrangements and dimensions of the sealing seats and electrodes. The sealing seats 52, 54 are located on either side of the meridian plane P passing through the axis of the outlet 58 and extend to the immediate vicinity thereof. The electrodes 62, 64 are also located on either side of the plane P while being spaced slightly apart from one another.
Le siège d'étanchéité 52 a une surface 52a qui s'étend sur un arc légèrement inférieur à celui séparant deux barreaux 22a consécutifs, c'est-à-dire deux sommets extérieurs consécutifs de l'élément filtrant. De la sorte, la surface 52a n'est en contact qu'avec un seul sommet de l'élément filtrant. L'extrémité amont de la surface 52a, dans le sens de rotation du filtre, marque donc une limite entre la zone d'adsorption et la zone de régénération. Les électrodes 62, 64 s'étendent sur les arcs sensiblement égaux et légèrement inférieurs à celui séparant deux sommets consécutifs de l'élément filtrant. L'extrémité amont de l'électrode 62 est légèrement en aval de celle du siège d'étanchéité 52 et le pas angulaire entre les électrodes est choisi sensiblement égal à celui séparant deux sommets consécutifs de l'élément filtrant. De la sorte, un sommet Si de l'élément filtrant vient en contact avec l'électrode 62, après contact avec le siège d'étanchéité 52, et sensiblement en même temps que le sommet suivant, S2 de l'élément filtrant (dans le sens de rotation R) vient au contact de l'électrode 64, ce qui démarre le chauffage de la partie de l'élément filtrant située entre ces deux sommets (montrée en tirets courts sur la figure 5).The sealing seat 52 has a surface 52a which extends over an arc slightly smaller than that separating two consecutive bars 22a, that is to say two consecutive external vertices of the filter element. In this way, the surface 52a is in contact with only one vertex of the filter element. The upstream end of the surface 52a, in the direction of rotation of the filter, therefore marks a limit between the adsorption zone and the regeneration zone. The electrodes 62, 64 extend over the arcs which are substantially equal and slightly lower than that separating two consecutive vertices of the filter element. The upstream end of the electrode 62 is slightly downstream from that of the sealing seat 52 and the angular pitch between the electrodes is chosen to be substantially equal to that separating two consecutive vertices of the filter element. In this way, an apex Si of the filter element comes into contact with the electrode 62, after contact with the sealing seat 52, and substantially at the same time as the next apex, S 2 of the filter element (in the direction of rotation R) comes into contact with the electrode 64, which starts the heating of the part of the filter element situated between these two vertices (shown in short dashes in FIG. 5).
Le siège d'étanchéité 54 s'étend sur un arc légèrement supérieur à celui séparant deux sommets consécutifs de l'élément filtrant. De la sorte, après que le sommet S2 de l'élément filtrant ait quitté l'électrode 62 et le siège d'étanchéité 52 et soit venu au contact de l'extrémité amont du siège d'étanchéité 54, la partie de l'élément filtrant située entre ce sommet et le sommet suivant S3 dans le sens de rotation R (partie montrée en tirets longs sur la figure 5) est inactive provisoirement, les deux sommets qui la bordent étant en contact simultanément avec le siège d'étanchéité 54. Cela permet un refroidissement de cette partie de l'élément filtrant avant entrée dans la zone d'adsorption, dès que le sommet S3 quitte le siège d'étanchéité 54.The sealing seat 54 extends over an arc slightly greater than that separating two consecutive vertices of the filter element. In this way, after the top S 2 of the filter element has left the electrode 62 and the sealing seat 52 and has come into contact with the upstream end of the sealing seat 54, the part of the filter element located between this top and the next top S 3 in the direction of rotation R (part shown in long dashes in FIG. 5) is temporarily inactive, the two tops which border it being in simultaneous contact with the sealing seat 54 This allows this part of the filter element to cool before entering the adsorption zone, as soon as the top S 3 leaves the sealing seat 54.
Un avantage particulier résultant de l'utilisation d'un tissu de carbone activé chauffé par effet Joule réside dans la rapidité de son échauffement et de son refroidissement. Il n'est donc pas nécessaire que le siège d'étanchéité 54 s'étende sur un arc important, ce qui permet d'optimiser la zone d'adsorption.A particular advantage resulting from the use of an activated carbon fabric heated by the Joule effect lies in the rapidity of its heating and cooling. It is therefore not necessary for the sealing seat 54 to extend over a large arc, which makes it possible to optimize the adsorption zone.
Dans l'exemple qui vient d'être décrit, la fraction de l'élément filtrant en cours de régénération est comprise entre deux sommets consécutifs. Toutefois, selon le nombre d'ondulations de l'élément filtrant et les dispositions des électrodes et sièges d'étanchéité, la fraction en cours de régénération pourra s'étendre entre deux sommets non consécutifs.In the example which has just been described, the fraction of the filter element during regeneration is between two consecutive vertices. However, depending on the number of corrugations of the filter element and the arrangements of the electrodes and sealing seats, the fraction being regenerated may extend between two non-consecutive peaks.
Une installation telle que celle décrite ci-avant a été réalisée avec un élément filtrant formé par une bande de tissu de carbone activé de 26 cm de large et 2,6 m de long. Le tissu de carbone activé a été 10An installation such as that described above was carried out with a filter element formed by a strip of activated carbon fabric 26 cm wide and 2.6 m long. Activated carbon tissue has been 10
obtenu par traitement thermique d'un tissu précurseur en fibres de rayonne textile selon la technique décrite dans la demande de brevet FR 97 03 083. La résistance électrique de chaque fraction de l'élément filtrant située entre deux sommets consécutifs a été mesurée. Les valeurs obtenues sont comprises entre environ 2 et 3 Ω.obtained by heat treatment of a precursor fabric of textile rayon fibers according to the technique described in patent application FR 97 03 083. The electrical resistance of each fraction of the filter element located between two consecutive peaks was measured. The values obtained are between approximately 2 and 3 Ω.
La température obtenue pour une fraction d'élément filtrant varie de 70°C à 170°C lorsqu'une tension est appliquée variant de 12 V à 24 V, les fractions adjacentes restant à la température ambiante de 25°C. La vitesse de montée en température après application de la tension est d'environ 20°C/min. Le refroidissement est plus rapide, notamment sous l'effet du flux gazeux entrant.The temperature obtained for a fraction of filter element varies from 70 ° C to 170 ° C when a voltage is applied varying from 12 V to 24 V, the adjacent fractions remaining at room temperature of 25 ° C. The rate of temperature rise after application of the voltage is approximately 20 ° C / min. Cooling is faster, especially under the effect of the incoming gas flow.
La figure 6 illustre schématiquement une installation dans laquelle plusieurs filtres rotatifs 10, semblables par exemple à celui décrit ci-avant, sont placés en cascade, la deuxième conduite de sortie 16 d'un filtre étant reliée à la conduite d'amenée 12 du filtre suivant.FIG. 6 schematically illustrates an installation in which several rotary filters 10, similar for example to that described above, are placed in cascade, the second outlet pipe 16 of a filter being connected to the supply pipe 12 of the filter next.
Une telle installation permet d'enrichir progressivement la concentration du flux gazeux en éléments qu'il contient. Elle peut notamment être utilisée pour le traitement de flux gazeux contenant des molécules de solvant. L'augmentation progressive de la concentration facilite la récupération finale du solvant.Such an installation makes it possible to gradually enrich the concentration of the gas flow in the elements which it contains. It can in particular be used for the treatment of gas streams containing solvent molecules. The gradual increase in concentration facilitates the final recovery of the solvent.
Les figures 7 à 10 illustrent un autre mode de réalisation d'une installation conforme à l'invention, qui se distingue de celui des figures 1 à 5 en ce que la desorption est réalisée en utilisant un courant gazeux distinct du flux gazeux à traiter. Un tel mode de réalisation peut être préféré dans le cas où l'enrichissement du flux gazeux à traiter en éléments qu'il contient présente des inconvénients. Il en est ainsi lorsque ces éléments représentent un danger à concentration élevée, ce qui est par exemple le cas pour certains types de solvants avec lesquels un risque d'explosion existe au-delà d'un certain seuil de concentration dans l'air.Figures 7 to 10 illustrate another embodiment of an installation according to the invention, which differs from that of Figures 1 to 5 in that the desorption is carried out using a gas stream separate from the gas stream to be treated. Such an embodiment may be preferred in the case where the enrichment of the gas flow to be treated with elements which it contains has drawbacks. This is so when these elements represent a danger at high concentration, which is for example the case for certain types of solvents with which a risk of explosion exists beyond a certain concentration threshold in the air.
Les éléments communs au mode de réalisation des figures 7 à 10 et à celui des figures 1 à 5 portent les mêmes numéros de référence et ne seront pas à nouveau décrits en détail.The elements common to the embodiment of Figures 7 to 10 and to that of Figures 1 to 5 bear the same reference numbers and will not be described again in detail.
L'installation des figures 7 à 10 comporte un filtre rotatif 10 recevant un flux gazeux à traiter amené par une conduite 12, par exemple de l'air chargé de molécules de solvant. L'air épuré après adsorption est 11The installation of FIGS. 7 to 10 comprises a rotary filter 10 receiving a gaseous flow to be treated supplied by a line 12, for example air loaded with solvent molecules. The purified air after adsorption is 11
recueilli par une conduite 14, sur une première sortie du filtre 10. Les molécules désorbées sont entraînées par un courant gazeux amené par une conduite 70 vers une deuxième sortie du filtre, puis à travers une conduite 72, pour être acheminées, par exemple, vers un dispositif de récupération ou d'élimination. Le courant gazeux amené par la conduite 70 peut être de l'air ou un gaz neutre, par exemple de l'azote.collected by a pipe 14, on a first outlet of the filter 10. The desorbed molecules are entrained by a gas current brought by a pipe 70 to a second outlet of the filter, then through a pipe 72, to be conveyed, for example, to a recovery or disposal device. The gas stream supplied via line 70 can be air or a neutral gas, for example nitrogen.
Le filtre rotatif comprend un élément filtrant 20 entraîné en rotation à l'intérieur d'une enveloppe fixe 40. L'élément filtrant est, comme dans le mode de réalisation précédent, constitué par un tissu de carbone activé.The rotary filter comprises a filter element 20 driven in rotation inside a fixed casing 40. The filter element is, as in the previous embodiment, constituted by an activated carbon fabric.
Le tissu de carbone activé est monté sur des barreaux 22a, 22b, parallèles à l'axe 11 de rotation du filtre rotatif, en une ou plusieurs couches superposées. Les barreaux 22a, 22b sont disposés en deux couronnes extérieure et intérieure de sorte que le tissu de carbone, en passant alternativement autour d'un barreau 22a et d'un barreau 22b, décrit une surface cylindrique formant des ondulations.The activated carbon fabric is mounted on bars 22a, 22b, parallel to the axis 11 of rotation of the rotary filter, in one or more superimposed layers. The bars 22a, 22b are arranged in two outer and inner rings so that the carbon fabric, passing alternately around a bar 22a and a bar 22b, describes a cylindrical surface forming undulations.
Les barreaux sont maintenus entre deux plateaux latéraux ou flasques 26, 28 perpendiculaires à l'axe 11. Les extrémités de diamètre réduit des barreaux 22a, 22b pénètrent dans des orifices formés dans des pièces 34 en forme de coins qui sont fixés sur les plateaux 26, 28 et appliquent le tissu 20 de façon étanche sur des décrochements 26a, 28a des plateaux 26, 28.The bars are held between two lateral or flange plates 26, 28 perpendicular to the axis 11. The ends of reduced diameter of the bars 22a, 22b penetrate into orifices formed in wedge-shaped pieces 34 which are fixed to the plates 26 , 28 and apply the fabric 20 in a leaktight manner to recesses 26a, 28a of the plates 26, 28.
L'enveloppe 40 comprend une virole cylindrique 42 entourant le filtre rotatif, fermée par deux flasques 46, 48. Le flasque 46 est solidaire d'une tige 80 qui traverse axialement le filtre rotatif. Celui-ci est supporté en rotation sur la tige fixe 80 au moyen de paliers au niveau d'ouvertures centrales des plateaux 26, 28. Le plateau 28 présente une partie cylindrique centrale 28b qui fait saillie vers l'extérieur à travers un passage central formé dans le flasque 48, la partie cylindrique 28b étant supportée par le flasque 48 formant palier. A l'extérieur de l'enveloppe 40, la partie cylindrique 28b est couplée à un moteur 50 d'entraînement du filtre en rotation.The casing 40 comprises a cylindrical ferrule 42 surrounding the rotary filter, closed by two flanges 46, 48. The flange 46 is integral with a rod 80 which passes axially through the rotary filter. This is supported in rotation on the fixed rod 80 by means of bearings at the level of central openings of the plates 26, 28. The plate 28 has a central cylindrical part 28b which projects outwards through a central passage formed in the flange 48, the cylindrical part 28b being supported by the flange 48 forming a bearing. Outside the envelope 40, the cylindrical part 28b is coupled to a motor 50 for driving the filter in rotation.
Le flux gazeux à traiter amené par la conduite 12 pénètre dans le volume A situé du côté interne de l'élément filtrant à travers un orifice 46a formé dans le flasque 46 au voisinage de sa partie centrale, et à travers des orifices 26ç formés dans le flasque 26, autour de l'axe 11. 12The gas flow to be treated brought by the pipe 12 enters the volume A located on the internal side of the filter element through an orifice 46a formed in the flange 46 in the vicinity of its central part, and through orifices 26c formed in the flange 26, around axis 11. 12
Le courant gazeux entraînant les molécules désorbées passe à travers des orifices 28ç formés dans le plateau 28 et un orifice 48ç formé dans le flasque 48 et se raccordant à la conduite 72. Les orifices 28ç et 48ç se situent à une distance de l'axe 11 inférieure à celle séparant cet axe des barreaux 22b sur lesquels passe le tissu 20.The gas stream carrying the desorbed molecules passes through orifices 28c formed in the plate 28 and an orifice 48c formed in the flange 48 and connecting to the pipe 72. The orifices 28c and 48c are located at a distance from the axis 11 lower than that separating this axis from the bars 22b over which the fabric 20 passes.
Du côté interne, la virole 42 est munie de sièges d'étanchéité voisins 52, 54 qui permettent, par contact avec les génératrices externes des barreaux 22a sur lesquels passe le tissu 20, de partager de façon étanche le volume situé entre le côté externe de l'élément filtrant et la virole 42.On the internal side, the ferrule 42 is provided with neighboring sealing seats 52, 54 which allow, by contact with the external generators of the bars 22a over which the fabric 20 passes, to share in a leaktight manner the volume situated between the external side of the filter element and the ferrule 42.
Sensiblement au même niveau que les sièges d'étanchéité 52, 54, le flasque 46 est muni d'électrodes 62, 64 reliées à une source d'alimentation électrique extérieure et sur lesquelles les extrémités des barreaux 22a faisant saillie à travers le plateau 26 peuvent venir en contact frottant.Substantially at the same level as the sealing seats 52, 54, the flange 46 is provided with electrodes 62, 64 connected to an external electrical power source and on which the ends of the bars 22a projecting through the plate 26 can come in rubbing contact.
Les dispositions des sièges d'étanchéité 52, 54 et des électrodes 62, 64 sont telles que décrites ci-avant pour le mode de réalisation précédent.The arrangements of the sealing seats 52, 54 and of the electrodes 62, 64 are as described above for the previous embodiment.
Comme le montrent les figures 9 et 10, le volume situé entre le côté externe de l'élément filtrant 10 et la virole 42 est partagé, par les sièges d'étanchéité 52, 54, entre un premier volume A, qui communique avec la première sortie 56 du filtre reliée à la conduite 14, et un deuxième volume B, qui communique avec la deuxième sortie du filtre raccordée à la conduite 72, ainsi qu'avec une deuxième entrée 59 du filtre raccordée à la conduite 70. La deuxième entrée 59 est formée à travers la virole 42 entre les extrémités les plus rapprochées des sièges d'étanchéité 52, 54.As shown in Figures 9 and 10, the volume between the outer side of the filter element 10 and the shell 42 is shared, by the sealing seats 52, 54, between a first volume A, which communicates with the first outlet 56 of the filter connected to line 14, and a second volume B, which communicates with the second outlet of the filter connected to line 72, as well as with a second inlet 59 of the filter connected to line 70. The second inlet 59 is formed through the ferrule 42 between the closest ends of the sealing seats 52, 54.
Des moyens de cloisonnement fixes sont prévus, portés par la tige 80, pour isoler la zone de desorption de la zone d'adsorption du côté interne de l'élément filtrant 20. Ces moyens de cloisonnement (figures 8 à 10) comprenant deux cloisons 81 , 83 qui s'étendent radialement à partir de la tige 80 et qui forment entre elles un angle aigu α définissant l'angle le long duquel s'étend la zone de desorption. A leurs extrémités radiales, les cloisons 81 , 83 supportent des parois d'étanchéité 82, 84 en forme de segments de cylindre d'axe 11. Les parois 82, 84 sont situées au niveau des génératrices internes des barreaux 22b de la couronne intérieure sur lesquels passe le tissu 20. Le diamètre extérieur des parois 82, 84 est 13Fixed partitioning means are provided, carried by the rod 80, to isolate the desorption zone from the adsorption zone on the internal side of the filter element 20. These partitioning means (FIGS. 8 to 10) comprising two partitions 81 , 83 which extend radially from the rod 80 and which form between them an acute angle α defining the angle along which the desorption zone extends. At their radial ends, the partitions 81, 83 support sealing walls 82, 84 in the form of cylinder segments of axis 11. The walls 82, 84 are located at the level of the internal generatrices of the bars 22b of the inner ring on which pass the fabric 20. The outside diameter of the walls 82, 84 is 13
donc sensiblement égal à celui du décrochement 26a, 28a. En direction circonférentielle les parois 82, 84 s'étendent sur une distance sensiblement égale, ou très légèrement supérieure à celle séparant les génératrices internes de deux barreaux consécutifs 22b, tout en ménageant entre elles un intervalle. Les positions angulaires des parois 82, 84 correspondent approximativement à celles des sièges d'étanchéité 52, 54, de sorte que, lorsque deux barreaux externes 22a consécutifs sont en contact avec un même siège d'étanchéité 52 ou 54, le barreau interne intermédiaire est en contact avec la paroi 82 ou 84, et que, lorsque deux barreaux internes 22b consécutifs sont en contact avec une même paroi 82 ou 84, le barreau externe intermédiaire est en contact avec le siège d'étanchéité 52 ou 54.therefore substantially equal to that of the offset 26a, 28a. In the circumferential direction, the walls 82, 84 extend over a distance substantially equal to, or very slightly greater than, that separating the internal generatrices of two consecutive bars 22b, while providing an interval between them. The angular positions of the walls 82, 84 correspond approximately to those of the sealing seats 52, 54, so that, when two consecutive external bars 22a are in contact with the same sealing seat 52 or 54, the intermediate internal bar is in contact with the wall 82 or 84, and that, when two consecutive internal bars 22b are in contact with the same wall 82 or 84, the intermediate external bar is in contact with the sealing seat 52 or 54.
Les cloisons 81 , 83 s'étendent axialement sur toute la longueur du filtre rotatif. A leur extrémité adjacente au plateau 26, les cloisons 81 , 83 sont reliées par une paroi transversale 86 qui obture les orifices 26ç lorsque ceux-ci occupent une position angulaire située entre celle des cloisons 81 et 83, lors de la rotation du filtre.The partitions 81, 83 extend axially over the entire length of the rotary filter. At their end adjacent to the plate 26, the partitions 81, 83 are connected by a transverse wall 86 which closes the orifices 26c when these occupy an angular position situated between that of the partitions 81 and 83, during the rotation of the filter.
Une autre paroi obturatrice transversale 88, en forme de secteur de couronne, est portée par le flasque 48 pour obturer les orifices 28ç lorsque ceux-ci occupent une position angulaire autre que située entre les cloisons 81 et 83, lors de la rotation du filtre.Another transverse obturating wall 88, in the form of a crown sector, is carried by the flange 48 to close the orifices 28c when these occupy an angular position other than situated between the partitions 81 and 83, during the rotation of the filter.
Comme le montrent les figures 9 et 10, les cloisons 81 , 83, avec les parois obturatrices 86, 88 définissent, avec le côté interne de l'élément filtrant un volume C duquel le flux gazeux à traiter ne peut s'échapper qu'à travers l'élément filtrant et uniquement vers le volume A (zone d'adsorption). Il n'y a pas de communication entre le volume C recevant le flux gazeux à traiter et le volume B où se produit la desorption.As shown in FIGS. 9 and 10, the partitions 81, 83, with the obturating walls 86, 88 define, with the internal side of the filtering element, a volume C from which the gas flow to be treated can only escape through the filter element and only towards volume A (adsorption zone). There is no communication between volume C receiving the gas stream to be treated and volume B where desorption occurs.
Le fonctionnement de l'installation découle à l'évidence de la description qui précède.The operation of the installation is evident from the foregoing description.
Sur les figures 9 et 10, les parties de l'élément filtrant subissant un échauffement par effet Joule au zone de desorption sont représentées en traits interrompus.In FIGS. 9 and 10, the parts of the filter element undergoing heating by Joule effect in the desorption zone are shown in broken lines.
On notera qu'au cours de la rotation, il existe entre la zone de desorption et la zone d'adsorption des zones tampons (hachurées sur les figures 9 et 10) qui sont délimitées chacune par deux sommets externes 14Note that during the rotation, there are between the desorption zone and the adsorption zone buffer zones (hatched in Figures 9 and 10) which are each delimited by two external vertices 14
ou internes consécutifs de l'élément filtrant en contact simultané avec un siège d'étanchéité 52, 54 ou avec une paroi d'étanchéité 82, 84, et par le sommet interne ou externe intermédiaire.or consecutive internal of the filter element in simultaneous contact with a sealing seat 52, 54 or with a sealing wall 82, 84, and by the internal or external intermediate apex.
Afin de garantir que le courant gazeux utilisé en desorption ne parvienne pas dans le volume A relié à la première sortie du filtre, il est préférable que la pression P1 dans le volume A soit au moins égale ou supérieure à la pression P2 régnant dans le volume B relié à la deuxième entrée et à la deuxième sortie du filtre.In order to guarantee that the gaseous current used in desorption does not reach the volume A connected to the first outlet of the filter, it is preferable that the pressure P1 in the volume A is at least equal to or greater than the pressure P2 prevailing in the volume B connected to the second inlet and the second outlet of the filter.
La paroi obturatrice 86 empêche le flux gazeux à traiter d'accéder au volume B où se produit la desorption, tandis que la paroi obturatrice 88 empêche le flux gazeux à traiter de s'échapper directement à travers la deuxième sortie 59 du filtre. The obturator wall 86 prevents the gas flow to be treated from accessing the volume B where the desorption occurs, while the obturator wall 88 prevents the gas flow to be treated from escaping directly through the second outlet 59 of the filter.

Claims

15R E V E N D I C A T I O N S 15R EVENDICATIONS
1. Installation de traitement de gaz comprenant au moins un filtre rotatif qui comporte : un élément filtrant adsorbant (20) comprenant des fibres de carbone activé, des moyens (12) d'amenée d'un flux gazeux à traiter d'un côté de l'élément filtrant, une première sortie de gaz (14) pour recueillir le flux gazeux ayant traversé l'élément filtrant dans une zone d'adsorption correspondant à une première partie du trajet rotatif du filtre, des moyens de régénération de l'élément filtrant dans une zone de desorption correspondant à une deuxième partie du trajet rotatif du filtre, distincte de la première partie, et une deuxième sortie de gaz (16 ; 72) pour recueillir un courant gazeux ayant traversé l'élément filtrant dans la zone de desorption, caractérisée en ce que l'élément filtrant est formé par au moins une couche de tissu de carbone activé (20) décrivant une surface cylindrique autour de l'axe de rotation du filtre, les moyens d'amenée d'un flux gazeux à traiter s'ouvrent dans un volume situé d'un côté de l'élément filtrant (20), tandis que la première sortie de gaz (14) s'ouvre dans un volume situé de l'autre côté de l'élément filtrant, et les moyens de régénération comprennent des moyens (66) d'alimentation électrique d'une fraction de l'élément filtrant située dans la zone de desorption afin de réaliser un échauffement de cette fraction de l'élément filtrant par effet Joule.1. Gas treatment installation comprising at least one rotary filter which comprises: an adsorbent filter element (20) comprising activated carbon fibers, means (12) for supplying a gas flow to be treated on one side the filter element, a first gas outlet (14) for collecting the gas flow having passed through the filter element in an adsorption zone corresponding to a first part of the rotary path of the filter, means for regenerating the filter element in a desorption zone corresponding to a second part of the rotary path of the filter, distinct from the first part, and a second gas outlet (16; 72) for collecting a gas stream having passed through the filter element in the desorption zone, characterized in that the filter element is formed by at least one layer of activated carbon fabric (20) describing a cylindrical surface around the axis of rotation of the filter, the means for supplying a gas flow they to be treated open in a volume located on one side of the filter element (20), while the first gas outlet (14) opens in a volume located on the other side of the filter element , and the regeneration means comprise means (66) for electrically supplying a fraction of the filter element located in the desorption zone in order to heat this fraction of the filter element by Joule effect.
2. Installation selon la revendication 1 , caractérisée en ce que la surface cylindrique de l'élément filtrant (20) présente des ondulations. 2. Installation according to claim 1, characterized in that the cylindrical surface of the filter element (20) has undulations.
3. Installation selon l'une quelconque des revendications 1 et 2, caractérisée en ce que l'alimentation électrique de la fraction de l'élément filtrant située dans la zone de desorption est réalisée par contact frottant avec des électrodes d'alimentation (62, 64).3. Installation according to any one of claims 1 and 2, characterized in that the electrical supply of the fraction of the filter element located in the desorption zone is carried out by rubbing contact with supply electrodes (62, 64).
4. Installation selon l'une quelconque des revendications 1 à 3, caractérisée en ce que les moyens (12, 30ç) d'amenée d'un flux gazeux à traiter communiquent avec un côté de l'élément filtrant (20) dans la zone de desorption, de sorte que le courant gazeux recueilli sur la deuxième sortie de gaz (16) est constitué par une fraction du flux gazeux à traiter enrichi par des éléments désorbés de l'élément filtrant. 4. Installation according to any one of claims 1 to 3, characterized in that the means (12, 30c) for supplying a gas flow to be treated communicate with one side of the filter element (20) in the area desorption, so that the gas stream collected on the second gas outlet (16) consists of a fraction of the gas stream to be treated enriched by elements desorbed from the filter element.
5. Installation de traitement de gaz selon la revendication 4, caractérisée en ce qu'elle comprend plusieurs filtres rotatifs montés en 165. Gas treatment installation according to claim 4, characterized in that it comprises several rotary filters mounted in 16
cascade (figure 6), la deuxième sortie de gaz (16) d'un filtre étant reliée aux moyens d'amenée (12) de flux gazeux à traiter du filtre suivant.cascade (Figure 6), the second gas outlet (16) of a filter being connected to the gas flow supply means (12) to be treated from the following filter.
6. Installation selon l'une quelconque des revendications 1 à 3, caractérisée en ce que les moyens d'amenée d'un flux gazeux à traiter communiquent avec un côté de l'élément filtrant (20) dans la zone d'adsorption seulement, et des moyens supplémentaires (70) d'amenée d'un courant gazeux sont prévus qui communiquent avec un côté de l'élément filtrant dans la zone de desorption seulement. 6. Installation according to any one of claims 1 to 3, characterized in that the means for supplying a gas flow to be treated communicate with one side of the filter element (20) in the adsorption zone only, and additional means (70) for supplying a gas stream are provided which communicate with one side of the filter element in the desorption zone only.
PCT/FR1999/000660 1998-03-20 1999-03-22 Installation for treating gas with adsorbent disc filter WO1999048594A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2000537635A JP2002507477A (en) 1998-03-20 1999-03-22 Apparatus for processing gas using adsorption disk filter
EP99909063A EP1064076A1 (en) 1998-03-20 1999-03-22 Installation for treating gas with adsorbent disc filter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9803436A FR2776207B1 (en) 1998-03-20 1998-03-20 GAS TREATMENT PLANT BY ROTARY ADSORBENT FILTER
FR98/03436 1998-03-20

Publications (1)

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WO1999048594A1 true WO1999048594A1 (en) 1999-09-30

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EP (1) EP1064076A1 (en)
JP (1) JP2002507477A (en)
FR (1) FR2776207B1 (en)
WO (1) WO1999048594A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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CN113164858A (en) * 2018-12-18 2021-07-23 杜尔系统股份公司 Regenerative separation device for separating impurities from a gas flow

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CN104667703B (en) * 2015-02-02 2016-09-07 河海大学 The combined system of sulfur dioxide in a kind of charcoal absorption stack gases
IT201900014268A1 (en) * 2019-08-07 2021-02-07 Ufi Filters Spa BLOW-BY GAS FILTRATION ASSEMBLY WITH SHAFT WITH LOCKING INSERT
US11801470B2 (en) 2021-12-29 2023-10-31 Microsoft Technology Licensing, Llc Carbon capture system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5350067A (en) * 1976-10-20 1978-05-08 Taikisha Kk Rotary active carbon adsorption and treatment apparatus
FR2414945A1 (en) * 1978-01-20 1979-08-17 Castella Pierre De GAS FLUID CLEANER WITH ADSORBENT ROTOR
JPS5724616A (en) * 1980-07-19 1982-02-09 Seibu Giken:Kk Gas absorber
US4415342A (en) * 1980-09-24 1983-11-15 Minnesota Mining And Manufacturing Company Air pollution control process
JPH05146638A (en) * 1991-12-03 1993-06-15 Mitsubishi Heavy Ind Ltd Carbon dioxide removing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5350067A (en) * 1976-10-20 1978-05-08 Taikisha Kk Rotary active carbon adsorption and treatment apparatus
FR2414945A1 (en) * 1978-01-20 1979-08-17 Castella Pierre De GAS FLUID CLEANER WITH ADSORBENT ROTOR
JPS5724616A (en) * 1980-07-19 1982-02-09 Seibu Giken:Kk Gas absorber
US4415342A (en) * 1980-09-24 1983-11-15 Minnesota Mining And Manufacturing Company Air pollution control process
JPH05146638A (en) * 1991-12-03 1993-06-15 Mitsubishi Heavy Ind Ltd Carbon dioxide removing device

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 7824, Derwent World Patents Index; Class J01, AN 78-43033A, XP002087747 *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 094 (C - 105) 2 June 1982 (1982-06-02) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 533 (C - 1114) 27 September 1993 (1993-09-27) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113164858A (en) * 2018-12-18 2021-07-23 杜尔系统股份公司 Regenerative separation device for separating impurities from a gas flow
CN113164858B (en) * 2018-12-18 2023-04-04 杜尔系统股份公司 Regenerative separation device for separating impurities from a gas flow

Also Published As

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FR2776207B1 (en) 2000-06-16
EP1064076A1 (en) 2001-01-03
FR2776207A1 (en) 1999-09-24
JP2002507477A (en) 2002-03-12

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