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Publication numberUS3369598 A
Publication typeGrant
Publication dateFeb 20, 1968
Filing dateJul 22, 1965
Priority dateJul 27, 1964
Also published asDE1501462A1
Publication numberUS 3369598 A, US 3369598A, US-A-3369598, US3369598 A, US3369598A
InventorsList Heinz J
Original AssigneeBuss Ag
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Heat exchanger having a filling of rolling or tumbling bodies and method for the operation thereof
US 3369598 A
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Description  (OCR text may contain errors)

Feb. 20, 1%68 H. J. LIST 3,369,598

HEAT EXCHANGER HAVING A FILLING OF ROLLING OR TUMBLING BODIES AND METHOD FOR THE OPERATION THEREOF Filed July 22, 1965 INVENTOR. HEM/Z J L157 United States Patent 3,369,598 HEAT EXCHANGER HAVING A FILLING OF ROLL- ING 0R TUMBLING BODIES AND METHOD FOR THE OPERATION THEREOF Heinz 1. List, Pratteln, Switzerland, assignor to Buss A.G., Basel, Switzerland Filed July 22, 1965, Ser. No. 474,040 Claims priority, application Switzerland, July 27, 1964, 9,889/ 64 3 Claims. (Cl. 165-90) This invention relates to a heat exchanger having a filling or rolling or tumbling bodies and to a method for the operation thereof.

Apparatuses having a filling or rolling or tumbling bodies were originally used only for the grinding of the moist various products in a dry or in a wet-.pulpy condition. This universal utility with different states of aggregation has meanwhile also led to utilization in drying and reaction processes. It was here repeatedly found to be a disadvantage that the thermal transmission areas in such apparatuses are only very limited. In the case of relatively great thermal etfects therefore recourse must be made to auxiliary means. For example in the case of drying processes a hot gas current is conducted through the ball mill, in order to supply the necessary quantity of heat. In the case of reaction processes it is necessary, for relatively great thermal efiects, to conduct the rolling bodies also out of the apparatus with the roduct, to heat them up again outside and to pass them with the product into the apparatus again. Since the balls must be cleaned again in the heating up, the utilization of such apparatus for reactions hitherto is limited.

According to the present invention a heat exchanger is provided for liquid, pasty and granular materials, which heat exchanger comprises a housing with a filling or rolling bodies. The invention consists in that for the regulation of the thermal transmission areas there are provided heated, rib-like surfaces protruding into the rolling bodies filling, along which the rolling bodies move past, being cleaned at the same time.

The method for the operation of the heat exchanger consists in that in addition to the movement of the rolling bodies in the interior of the housing, they are brought constantly into circulating movement out of the housing and into it again, the rolling bodies being heated or cooled in their path outside the housing.

The invention will be further explained hereinafter with reference to examples of embodiment of the object thereof which are illustrated in the accompanying drawings, wherein:

FIGURE 1 shows a longitudinal section through an oscillatory mill,

FIGURE 2 shows a cross-section through this oscillatory mill,

FIGURE 3 shows a longitudinal section through a ball mill with annular heat transmission ribs,

FIGURE 4 shows a cross-section of FIGURE 3,

FIGURE 5 shows a ball mill with smooth outer wall and the arrangement of the heat-transmitting plates on a central tube and FIGURE 6 shows a cross-section through this ball mill.

In the drawings, the oscillatory mill as illustrated in FIGURES 1 and 2 comprises a cylindrical housing 1 with a heating jacket 2. The housing 1 is divided by plates 3 into individual chambers, which in turn are filled with suitable rolling bodies 4, for example balls or rolls. The plates 3 are hollow, and the cavities 5 are connected with the heating jacket 2 of the housing 1, and thus also conduct heat. The plates 3 have apertures 6 which provide a possibility of levelling for the rolling bodies. Moreover ice the product can run through the entire arrangement and provision is also made for withdrawal of gas if necessary.

The housing 1 is provided with an entry pipe, with an outlet pipe and with a gas-withdrawal pipe, which parts are not represented in the drawing. The rolling bodies 4 are set, by a suitable oscillatory drive, mostly into a circular oscillation perpendicular of the longitudinal axis of the apparatus, in which case according to experience a vigorous radial movement of the rolling bodies takes place in the apparatus. It now the raw material or materials is or are introduced, for example in liquid form, into the apparatus, the product will firstly fill the apparatus, in order then to flow out by way of an overflow at the outlet pipe, so that a continuous through-flow occurs. The product is here conducted past the heat-transmitting surfaces of the housing 1 and the plates 3, it being possible for heat to be supplied or equally removed by cooling through these surfaces. The vigorous movement of the product by the rolling bodies and the constant cleaning of these surfaces on the one hand permit good thermal transmission and on the other hand prevent the possibility of the material caking in certain plastic states of aggregation. The manner of the working through of the product by the movement of the rolling bodies prevents blockage even if the product is plastic. Therefore apart from reaction processes it is also possible for every kind of drying process to be carried out without difiiculty, in which the product is dried from the liquid condition, with constant expulsion of the liquid vapour, by way of the plastic condition to the dry or granular condition at the discharge.

A further embodiment of the object of the invention is represented in FIGURES 3 and 4. In these there is illustrated a ball mill with rotating housing. The cylindrical housing is designated by 11, and carries a heating jacket 12. In the housing 11 there are installed annular ribs 13 with heated cavities, as additional heat transmitting surfaces. The supply and removal of the products take place in known manner through the shaft journals of the ball mill.

FIGURES 5 and 6 show a ball mill in which additional heat transmitting surfaces 23 of disc form are arranged on a central tube 24 in a housing 21 with heating jacket 22. This tube 24 rotates together with the housing 21. According to a variant it is possible to make the housing 21 stationary and to arrange the central tube 24 with the discs 23 for rotation therein as agitator. Due to the arrangement of appropriate transverse bars it is ensured that the rolling bodies filling is circulated between the discs.

Moreover a combination of annular heat transmission surfaces arranged on the housing of the ball mill and the discs on the central tube is also possible.

The heating or cooling of the heat exchangers can take place with gaseous or with liquid media: the installation of a furnace chamber is also readily possible for higher temperatures.

In a further development of the heat exchanger as described, the rolling bodies carry out, in addition to the movement in the interior of the housing, a movement outside the housing. They are continuously withdrawn from the housing and brought in a cycle into the housing again, the rolling bodies being heated or cooled according to the need in their path outside the housing.

Various modifications may be introduced without departing from the invention as defined in the appended claims, and where the context permits it the term heated as used herein is to be construed as meaning either heated or cooled according to whether it is desired to raise or lower the temperature of materials in the heat-exchanger.

3 What I claim is: 1. A heat exchanger for liquid, pasty and granular materials, which comprises a housing having a material inlet, a material outlet and a gas withdrawal outlet, and displaceable about its longitudinal axis; a filling of rolling bodies in said housing; heat exchange means operatively associated with said housing to exchange heat with the latter; heat transfer ribs extending Within said housing and into said filling and in heat exchange relation with said heat exchanging means, said heat transfer ribs augmenting the heat transmission surfaces etfective on the material; said rolling bodies, upon displacement of said housing about its longitudinal axis, being displaced along the surfaces of said ribs to effect a cleaning action on the same.

2.A heat exchanger according to claim 1, in which said housing is divided by radially installed heated plates into chambers which are in communication with one another through apertures in the plates, said plates constituting said heat transfer ribs; the rolling bodies being 4., set in motion by oscillation-of said housing about its 1ongitudinal axis.

3. A heat exchanger according to claim 1, in which said housing is made in drum form and has annular heat transfer ribs secured on the inner surface of its cylindrical wall; the rolling bodies being set in motion by rotation of the drum.

References Cited UNITED STATES PATENTS 1,718,542 6/1929 Dobbelstein 165-88 2,231,249 2/1941 Brown 165-90 X 2,848,209 8/1958 Compton 23634 2,872,386 2/1959 A-spegren 165-88 X 2,899,176 8/1959 Francis et al. 1659O X ROBERT A. OLEARY, Primary Examiner.

MEYER PERLIN, Examiner.

A. W. DAVIS, JR., Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1718542 *Dec 12, 1924Jun 25, 1929Karoline DobbelsteinApparatus for drying, charring, and otherwise treating loose material
US2231249 *Jun 5, 1939Feb 11, 1941Thomas R BrownHeat exchange apparatus
US2848209 *Apr 16, 1954Aug 19, 1958Compton Charles EDehydrating apparatus
US2872386 *Apr 14, 1952Feb 3, 1959Oil Shale CorpHeat-treatment of piece-shaped material
US2899176 *Jan 22, 1958Aug 11, 1959 Heat exchanger
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3631917 *Sep 15, 1969Jan 4, 1972Dana CorpCentrifugal casting mold with free flowing particulate heat transfer means
US4208220 *May 15, 1978Jun 17, 1980The Research Corporation Of The University Of HawaiiMethod and apparatus for cleaning heat exchanger tubes mounted transversely to vertical flow of seawater
US4319903 *Aug 27, 1980Mar 16, 1982Owens-Corning Fiberglas CorporationHeat exchanger using furnace exhaust gases
US4353725 *Mar 23, 1981Oct 12, 1982Owens-Corning Fiberglas CorporationProcess and apparatus for recycling scrap glass
US4758153 *Jul 22, 1986Jul 19, 1988Kernforschungsanlage Julich Gesellschaft Mit Beschrankter HaftungVaporizer for liquid fuel for producing a fuel-air mixture
US4853024 *May 17, 1988Aug 1, 1989Owens-Corning Fiberglas CorporationScrap recovery apparatus
US5303904 *Jul 9, 1992Apr 19, 1994Fike CorporationMethod and apparatus for controlling heat transfer between a container and workpieces
US5316594 *Sep 20, 1991May 31, 1994Fike CorporationHardening a zirconium alloy by oxidation to form zirconium oxide layer
US5324009 *Oct 14, 1992Jun 28, 1994Willard E. KempApparatus for surface hardening of refractory metal workpieces
US5399207 *Nov 29, 1993Mar 21, 1995Fike CorporationNitriding or oxidation of zirconium or titanium, heating in fluidized bed
US5407498 *Nov 2, 1993Apr 18, 1995Kemp Development CorporationDiffusion of an active element into metal surface
US7910816 *Apr 29, 2009Mar 22, 2011Glowacki Stan CCircular percusive sound generation instrument
WO1982000634A1 *Jul 6, 1981Mar 4, 1982Owens Corning Fiberglass CorpPre-heating glass batch
Classifications
U.S. Classification165/90, 432/27, 165/109.1, 165/95, 432/215, 165/104.18
International ClassificationF28D11/02, F28F5/04, F28F5/00, F28C3/00, F28D11/06, F28C3/18, F28F5/02, B02C17/00, F28D11/00, B02C17/06
Cooperative ClassificationB02C17/06, F28D11/02, F28F5/02, F28F5/04, F28D11/06, F28C3/18
European ClassificationF28D11/02, F28C3/18, F28D11/06, F28F5/02, B02C17/06, F28F5/04