|Publication number||US3807143 A|
|Publication date||Apr 30, 1974|
|Filing date||Apr 28, 1972|
|Priority date||Apr 28, 1972|
|Publication number||US 3807143 A, US 3807143A, US-A-3807143, US3807143 A, US3807143A|
|Original Assignee||Peabody Engineering Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (17), Classifications (11)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent [1 1 Dunn Apr. 30, 1974 BUBBLE TRAY FOR GAS WASHING 2,070,578 2/1937 Bowman 55/223 APPARATUS 3,633,882 1/1972 Karakawa et al. 261/114 R John Dunn, Mountvale, NJ.
Peabody Engineering Corporation, New York, NY.
Filed: Apr. 28, 1972 Appl. No.: 248,426
US. Cl 55/223, 55/238, 55/228, 55/229, 55/242, 44/244, 261/79 A, 261/114 R Int. Cl 801d 47/00 Field of Search 55/223, 228, 229, 237, 55/242, 238, 244; 261/79 A, 114 R References Cited UNITED STATES PATENTS 7/1933 Urquhart 261/114 R Primary ExaminerFrank W. Lutter Assistant Examiner-Steven H. Markowitz Attorney, Agent, or Firm-N. L. Leek; Robert H. Bachman ABSTRACT A bubble tray for gas washing apparatus adapted to carry a blanket of wash liquid and having rows of holes through which the gases pass into the liquid. A curved deflector plate forming a circular channel is disposed over each row of holes with a longitudinal opening registering with the holes to receive the rising gases. The gases enter the channel tangentially through a constricted passage to cause the liquid to rotate therein and to deposit the entrained particles centrifugally onto the circular walls of the plate.
13 Claims, 4 Drawing Figures BUBBLE TRAY FOR GAS WASHING APPARATUS This invention relates to gas washing apparatus of the type having a bubble tray carrying a layer of wash liq uid through whichthe gases pass and which is adapted to entrap and remove suspended particulate material. An object is to provide apparatus of the above type having novel and improved operating characteristics.
A feature of the invention is the provision of a deflector plate having a curved portion forming an inverted substantially circular channel having a longitudinal opening which is disposed in alignment with the holes in the bubble tray. The gases pass into this channel substantially tangentially through a constricted passage and cause the liquid in the channel to rotate and to form a mixture of air and liquid from which the particulate material is separated centrifugally. The gases and liquid pass longitudinally along the deflector and are discharged at the endsthereof or through various openings in the deflector wall. a
The nature of the invention will be better understood by referring to the following description, taken in connection with the accompanying drawing in which a specific embodiment has been set forth for purposes of illustration.
In the drawing:
FIG. 1 is a vertical section through a gas washing apparatus embodying the present invention with parts in elevation; I
FIG. 2 is a section taken on the line 2-2 of FIG. 1
I showing the arrangement of the deflector plate;
FIG. 3 is a partial section taken on the line 3--3 of FIG. 1 showing the construction of the access pipe and valve; and
FIG. 4 is a partial section similar to FIG. 2 but on a larger scale to illustrate the details of the deflector plate and the constricted passage.
Referring to the drawing more in detail, the apparatus is shown as embodying a vessel having side walls 11, a coned top 12 and a coned bottom' 13. The bottom 13 is formed with an inlet port 14 surrounded by a flange 15 which rests upon the cover 16 of a receiver 17 having a port registering with the inlet port 14.
The vessel 10 is shown as having twobubble trays 20 which are oppositely inclined for the flow of liquid from one to the other. The trays may, however, be mounted horizontally if desired. Each tray 20 is provided with a plurality of rows of holes 21 through which the gas passes and bubbles upwardly through a liquid layer 22 which is held on the tray by a weir 23 at the lower side of the tray. Liquid which flows over the weirs 23 passes to the tray below or through the bottom port 14 into the receiver. The liquid is prevented from passing through the holes 21 by the pressure of the upwardly flowing gases.
Disposed over the rows of holes 21 are a series of deflector plates having a lower substantially straight portion 31 which is supported above the surface of the bubble tray 20 by supporting feet 32. Extending upwardly from the portion 31 is an arcuate portion 33 which may extend around a substantially 345 arc to form a channel 35 of substantially circular section, leaving an opening 34 which is disposed directly over the holes 21. The straight portion 31 is shown as slightly inclined and tangential to the arcuate portion 33. The trailing portion 38 of the arcuate wall 33 is inclined upwardly toward the passage34 to form with the inclined wall 31 a converging venturi type passage 39 disposed above the holes 21 through which the gases and liquid enter the circular channel 35. The gases and liquid are thus injected into the channel 35 with an increased velocity due to the venturi action of the converging passage 39 and caused to rotate rapidly within the passage 35 so as to separate centrifugally the particular material and liquid from the gases.
The stripped gases collect in the upper portion of the channel 35 and pass along the channel until they reach a vent opening 37. The gases then pass upwardly through the remaining portion of the liquid blanket 22 carrying a part of the liquid in the form of a spray which impinges on the undersurface of the next bubble tray 20 or, in the case of the upper tray, they pass into the drying zone 40 which may contain drying apparatus of any desired type for stripping the remaining liquid from the gases. The dried gases are then discharged from the top opening 41. Gas flow may be induced by a blower (not shown) in either the inlet or the outlet duct. The wash liquid containing the entrained particulate material passes through the bottom opening 14 into the liquid in the receiver 17 where the particulate material settles out as a sludge which may be removed by any suitable means through discharge pipe 45. The liquid level is maintained in the receiver by a supply pipe 46.
The gases to be cleaned are fed into the vessel 10 through an inlet duct 47 and the cleaned gases are removed through outlet duct 48.
The liquid from which the solids have been removed may be recycled by passing through a filter, not shown, to a pump 50 from which they are fed by pipe 51 into the vessel 10 at a point above the topmost tray 20 and through a pipe 52 extending below the lowermost tray and having spray openings 53 adapted to discharge a spray 54 onto the underside of the lowermost tray for washing the same and also for prewashing the gases for removing the larger suspended particles.
The particulate material is removed from the wall 33 of the plate 30 by inserting a brush 55 through a pipe 56 which registers with the channel 35 and extends through the wall 11 of the vessel 10. The inclination of the trays 20 and of the pipes 56 is such that the opening is above the level of the liquid on the trayso that no liquid escapes. A closure valve 57 may be provided to seal the pipe 56 between cleaning operations. In the event that the trays are positioned substantially horizontally so that the opening would be below the liquid level a suitable air lock may be provided to prevent escape of liquid during cleaning.
The weir 23 is of a height to maintain a depth of liquid sufiicient to submerge'the various deflector plates 30 and the channels 35 therein.
What is claimed is:
1. Gas washing apparatus comprising a housing arranged to yield upwardly flowing gases containing particulate matter, a bubble tray arranged across the gas flow path having rows of holes through which the rising gases pass and said tray carrying a blanket of liquid, elongated-deflector plates mounted on said tray and curved to form substantially circular channels therewithin and having longitudinal openings therein disposed above and arranged in direct fluid flow communication with the rows of holes in such a manner that gases from said holes and liquid from said tray pass into said channels to form a rotating gas-liquid mixture which deposits the entrained particulate matter centrifugally onto the walls of the plates and means for separating the thus cleaned gas from the liquid. i
2. Apparatus as set forth in claim 1 in which said plates are submerged in said blanket.
3. Apparatus as set forth in claim 2 in which said plates have gas discharge openings in their upper portion.
4. Apparatus as set forth in claim 1 in which said deflector plates are formed with an inclined substantially straight portion terminating in an arcuate portion having its trailing edge spaced from said first portion to form said openings in fluid flow communication with said rows of holes. 1
5. Apparatus as set forthin claim 4 in which the trailing part of said arcuate portion is inclined upwardly to form with said first mentioned inclined portion a converging passage through which the liquid and gases pass into said circular channel.
6. Apparatus as set forth in claim 5 in which the walls of said arcuate portion extend through substantially 345.
I 7. Apparatus as set forth in claim 1 including a plurality of said trays in which said trays are provided with weirs to maintain said'blanket of liquid thereon.
8. Apparatus as set forth in claim 7 in which said trays are inclined for the flow of liquid over said weirs onto the next succeeding tray through downcomers.
9. Apparatus as set forth in claim I in which said trays are disposed in a vessel having side walls and openings are provided in said side walls inregistration with the respective channels for the insertion of a cleaning tool.
10. Apparatus as set forth in claim 9 in which said side wall openings are disposed above the level of the liquid of said blanket.
. 11. Apparatus as set forth inclaim 1 including a stack of said trays and means disposed to wash the underside of ,the lowermost tray. 12. Apparatus as set forth in claim 1 in which a plurality of trays are stacked in said housing and including a. pump connected to recirculate wash liquid onto said trays for maintaining said blanket of liquid thereon.
13. Apparatus as set forth in claim 12 including a particulate matter settling receiver disposed below said housingto receive wash liquid from said trays andin which the separated particulate material settles out as sludge, and means to recirculate the thus cleaned liquid from said receiver onto said trays for maintaining said blanket thereon.
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|U.S. Classification||96/228, 96/277, 96/240, 261/114.1, 261/79.2, 96/314, 96/296, 96/306|