CA1094446A - Stack gas clarifier - Google Patents
Stack gas clarifierInfo
- Publication number
- CA1094446A CA1094446A CA275,781A CA275781A CA1094446A CA 1094446 A CA1094446 A CA 1094446A CA 275781 A CA275781 A CA 275781A CA 1094446 A CA1094446 A CA 1094446A
- Authority
- CA
- Canada
- Prior art keywords
- stack
- conduit
- liquid
- concentric
- nozzles
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
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Abstract
STACK GAS CLARIFIER
ABSTRACT OF THE DISCLOSURE
A liquid spray-type stack gas clarifier is adapted to be mounted within existing stacks and supported therein from the top of the stack structure. Means are provided for main-taining gas flow velocity within the stack to compensate for pressure changes resulting from the cooling effect of the liquid spray curtain discharged into the stack to entrain and absorb particulate and gaseous pollutants from the stack gas.
The spray liquid and absorbed pollutants are collected within and drained from the stack, and means may be provided for shielding existing stack structure from adverse effects of the scrubbing liquid.
ABSTRACT OF THE DISCLOSURE
A liquid spray-type stack gas clarifier is adapted to be mounted within existing stacks and supported therein from the top of the stack structure. Means are provided for main-taining gas flow velocity within the stack to compensate for pressure changes resulting from the cooling effect of the liquid spray curtain discharged into the stack to entrain and absorb particulate and gaseous pollutants from the stack gas.
The spray liquid and absorbed pollutants are collected within and drained from the stack, and means may be provided for shielding existing stack structure from adverse effects of the scrubbing liquid.
Description
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to apparatus for cleansing stack gases, and more particularly to a liquid spray apparatus for continuously washing or scrubbing stack gases for removing solid and gaseous pollutants therefrom.
Description of the Prior Art A major source of air pollution is the smoke and noxious gases which are discharged directly into the atmosphere from smoke stacks. Many of the stack gases, particularly those from incinerators and certain industrial processes, contain substantial quantities of soluble gaseous pollutants and en-train substantial quantities of solid particulate matter which may be washed, or scrubbed, from the stack gas. Numerous washing devices have been developed and used for removing the particulate and soluble gaseous pollutants from stack gases, with these prior devices generally employing a system of nozzles for spraying a wash liquid directly into the gas stream to absorb or entrain the contaminates. The contaminated liquid is then collected from the gas stream to thereby prevent the pollutants from being discharged into the atmosphexe.
Discharging the necessary volume of scrubbing liquid into the flow of gases in a stack will inherently materially alter the operating characteristics of the stack. Thus, a substantial pressure drop will result in the stack due both to the energy directly absorbed from the stack gas stream by the spray liquid and by the substantial reduction in tempera-ture resulting from spraying the liquid into the normally high - 1 - ~,r ., 10~ 46 temperature gas stream. The resultant modification of stack flow characteristics will in most cases adversely effect the primary process whether it be the burning of trash in an in-cinerator, conventional fuels in a furnacer or other industrial process.
Various attempts have been made to solve the problems created by the introduction of scrubbing liquid into a stack gas stream, including use of means for inducing an increased stack velocity to compensate for reductions caused by the in-gestion of liquid into the gaseous stream. These devices have,however, generally required special design of the stack and have not generally been readily adaptable to existing, conven-tionally designed stacks. Furthermore, these prior devices have generally been relatively expensive to manufacture and have been difficult to maintain and operate due to the rela-tive inaccessibility of much of the apparatus.
SUMM~RY OF THE INVENTION
In accordance with the present invention, an improved stack gas scrubbing apparatus is provided which may readily be installed within and used in connection with the operation of existing, conventionally designed stacks of a wide range of design configurations and operational characteristics. This is accomplished by providing a clarifier which is supported within the interior of a conventional stack by a hanging mechansim engaging the top rim of the stack and extending down-wardly from the open top thereof to support the operational components of the clarifier concen~rically within the stack in spaced relation to the open top~ The apparatus includes a . , ~ .
plurality of liquid spray nozzles arranged to discharge a scrubbing liquid in an upward and outward direction, with means being provided below the liquid spray nozzles for col-lecting the liquid and the pollutants carried thereby which fall within the stack. Means are also provided for dis-charging a high-pressure stream of gas concentrically within the stack and at a point spaced above the spray nozzles to maintain the desired gas velocity through the stack to assure proper flow of the stack gases through the stack.
In a preferred embodiment of the invention, the con-duit supplying the scrubbing liquid is arranged coaxially within the stack, with the spray nozzles being directed up-wardly and outwardly toward the inner walls of the stack. A
sleeve member, supported by the scrubber support mechanism, surrounds the interior surface of the stack in the vicinity of the nozzles so that liquid reaching the outer portion of the stack will not harm the inner wall structure of the stack Preferably, the slee~-e terminates at its bottom end in an in-wardly and downwardly inclined baffle, or skirt, to direct liquid flowing down the wall inwardly to the means for collecting the excess liquid.
In an alternate embodiment, the conduit supplying the pressure liquid extends externally of the stack structure, and the nozzles themselves are supported on annular conduits or manifolds with the nozzles projecting through openings in the stack wall to direct the liquid spray in inwardly and up-wardly inclined paths merging towa~d the conduit for the pres-sured gas arranged centrally within the stack~
~ -1~4~46 BRIEF DESCRIPTION OF THE DRAWING
_ The foregoing structure and its operation will become more apparent from the following detailed description, taken in conjunction with the drawings, in which:
Fig. 1 is a schematic illustration of a stack gas clarifying system according to the present invention;
Fig. 2 is a vertical sectional view through the top portion of the stack shown in Fig. 1 and illustrating the structural details of the clarifier; and Fig. 3 is a view similar to Fig. 2 and illustrating an alternate embodiment of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings in detail, a stack of conventional construction and of the type which may be employed with a conventional heating plant, or incinerator, is designated generally by the reference numeral 10. Arranged at a point remote from the stack is a collecting and ettling tank 12 which receives scrubbingli~uid through conduit 14 from the interior of the stack. From the settling and clarifying tank 12, the scrubbing liquid is pumped, as by pump 16, through a filter 18 into a pressurized holding tank 20 from which it flows under pressure through liquid supply conduit 22 to the scru~ing apparatus illustrated in Figs. 2 and 3 and supported on the open top of the stack 10.
Referring first to the embodiment of the invention illustrated in Fig. 2, a rigid support ring 24 is adapted to be seated upon the top edge of the`wall 26 of stack 10, with the top of the stack being received in an undercut groove 28 , .
in ring 24. A plurality of metal hanger bars 30 are rigi~ly welded to the ring 24 and extend downwardly at a slight in-clined angle within the stack 10 to support the scrubber as-sembly within the stack.
The scrubber assembly supported on the hanger bars 30 is indicated generally by the reference numeral 32 and com-prises three concentric conduits, the innermost of which is the upper end of p~essure supply conduit 22. A plurality of spray nozzles 34 are mounted on the top end portion of conduit 22, with the nozzles extending upwardly and outwardly to the walls of the outer concentric conduit 36. Preferably the nozzles 34 are arranged in two vertically spaced, circumferentially off-set rings each including a plurality of nozzles substantially l equally spaced therearound, with the nozzles in the two rings ; 15 being inclined at approximately 45 degrees from the horizontal to thereby direct the liquid spray in the desired upwaxd and outward direction.
The central concentric conduit 38 has its upper and lower ends enclosed, as by annular flanges 40, 42, respectively, ; through which the inner conduit 22 passes, and the botto~ end of conduit 38 is connected in fluid communication with the out-let conduit 14.
The outermost concentric conduit 36 has its lower end connected to a supply-tube 46 which, in turn, is connected ; 25 to a blower 48 (Fig. 1) for supplying pressure air to be discharged through a nozzle 50 mounted on the top end of conduit 36 to produce, by an aspiration effect, an increased velocity to stack gas to be scrubbed rising within the stack and thereby compensate for any reduced velocity caused hy ~, ; - 5 -lQ~3~44~
the liquid spray. The blower 43 may simply supply compressed air or alternatively may draw a portion of the gas to be scrubbed, which is otherwlse directed into the base of the stack through conventional entry means (not shown), and increase the pressure of this gas before it is discharged into the top of the stack.
An upwardly open annular, substantially V-shaped trough, or funnel 52, is formed around the outer periphery of the outer concentric conduit 36 in position to catch scrubbing liquid falling downwardly in the central portion of the stack 10.
This liquid is conveyed, through two short drain tubes 54 in-wardly into conduit 38 through which it flows downwardly and into conduit 14 to be conveyed to settling tank 12. A second annular, upwardly open trough member 56 is spaced below the ' trough 52, with the outer periphery trough 56 having an outer !: 15 diameter substantially equal to the diameter of the interior ; of the stack wall 26 and having an inner diameter substantially greater than the diameter of the outer concentric conduit 36.
; Trough 56 is supported by a pair of short drain tubes 58 which are in fluid communication with the interior of the concentric tube 38. It is also noted that the outer diameter of the upper trough 52 is substantially equal to or slightly greater than the inner diameter of the trough 56 whereby there is no direct path downward through the stack so that scrubbing liquid dis-charged from the nozzles will tend to fall into one or the other of the two collecting troughs.
A cylindrical sleeve 60 having an outside diameter substantially equal to the inner d~ameter of the stack 10 is mounted on the outer concentric conduit 36 by suitable upport -~~'~''' ~0~446 arms 62. The sleeve 60 provides a shield for the inner sur-face of the stack walls 26 in the area of the liquid spray discharged from the nozzles 34 to protect the stack wall from the errosive and corrosive effect of the liquid and to pre-vent the liquid from collecting on and running down the wallsof the stack. To this end, an inwardly and downwardly in-clined annular baffle 64 is formed on the bottom end of the sleeve 60 to direct collected liquid into the interior portion of the stack to be collected by the troughs 52 and 56.
Mounted on the hanging bars 30 above the gas discharge nozzle 50, as by mounting bracket 66, is an aspirator assembly for increasing the flow velocity through the stack to compen-sate for any reduction in velocity, or back pressure, created by the liquid scrubbing operation. This aspirator assembly consists of a hollow frusto-conical member 68 mounted coaxially with and having its base spaced slightly above the discharge nozzle 50 and its smaller upper end positioned within the large open end of a venturi section 70. Thus, high pressure air discharged from the nozzle 50 will enter the larger open base of the conical member 68 and, at the same time, entrain stack gases into the cone, by an aspirator effect, to increase the velocity of the stack gases. This mixture of high pressure air and stack gases will, in turn, be discharged into the en-larged entrance of the venturi 70 to further increase the velocity of stack gases entering into the open base of the venturi around the conical member 68.
The embodiment illustrated `in Fig. 3 differs from that just described primarily in that the liquid scrubbing solution ~' :
105'44~6 is discharged into the stack gases in an inwardly and up-wardly inclined direction rather than the outwardly and up-wardly inclined direction just described. To this end, pres-sure inlet conduit 22 is mounted outside the stack rather than concentrically within the return conduit 38 and pressure gas conduit 36. Apart from this, the collection conduit, pressure gas conduit, and the liquid collection system supported con-centrically within the stack are identical to that described and like reference numerals are applied thereto. It could also be mentioned that, by directing the scrubbing liquid in-wardly, the necessity for the lining sleeve 60 of the embodi-ment of Fig. 2 might not be required in the Fig. 3 embodiment and is not illustrated~ Similarly~ the aspirator of Fig~ 2 is not illustrated in the Fig. 3 embodiment, although it will be apparent that either of these structures may be used if desired.
The nozzles 134 employed to spray the scrubbing liquid into the stack gases are mounted on manifolds 135 connected in fluid communication with the conduit 22, with the nozzles 134 themselves projecting through openings formed in the wall 26 of the stack 10.
As illustrated in phantom lines in Fig. 3, the various supply and drain conduits may, if desired, be extended through the walls of the stack 10 at a point below the scrubbing assem-bly to facilitate maintenance of the plumbing and to removethese components from the hostile atmosphere which may exist within the stack. However, it may be desirable to maintain at least the pressure air conduit within the stack throughout 1~4446 a major portion of the stack height. Particularly where the hot combustion gases are employed as the pressure gas, to prevent excessive cooling which could result by placing the conduit outside the stack throughout the major portion of the height.
While I have disclosed and described preferred embodi-ments of my invention, I wish it understood that I do not intend to be restricted solely thereto, but rather that I do intend to include all embodiments thereof which would be ap-parent to one skilled in the art of which comes within thespirit and scope of my invention.
Field of the Invention This invention relates to apparatus for cleansing stack gases, and more particularly to a liquid spray apparatus for continuously washing or scrubbing stack gases for removing solid and gaseous pollutants therefrom.
Description of the Prior Art A major source of air pollution is the smoke and noxious gases which are discharged directly into the atmosphere from smoke stacks. Many of the stack gases, particularly those from incinerators and certain industrial processes, contain substantial quantities of soluble gaseous pollutants and en-train substantial quantities of solid particulate matter which may be washed, or scrubbed, from the stack gas. Numerous washing devices have been developed and used for removing the particulate and soluble gaseous pollutants from stack gases, with these prior devices generally employing a system of nozzles for spraying a wash liquid directly into the gas stream to absorb or entrain the contaminates. The contaminated liquid is then collected from the gas stream to thereby prevent the pollutants from being discharged into the atmosphexe.
Discharging the necessary volume of scrubbing liquid into the flow of gases in a stack will inherently materially alter the operating characteristics of the stack. Thus, a substantial pressure drop will result in the stack due both to the energy directly absorbed from the stack gas stream by the spray liquid and by the substantial reduction in tempera-ture resulting from spraying the liquid into the normally high - 1 - ~,r ., 10~ 46 temperature gas stream. The resultant modification of stack flow characteristics will in most cases adversely effect the primary process whether it be the burning of trash in an in-cinerator, conventional fuels in a furnacer or other industrial process.
Various attempts have been made to solve the problems created by the introduction of scrubbing liquid into a stack gas stream, including use of means for inducing an increased stack velocity to compensate for reductions caused by the in-gestion of liquid into the gaseous stream. These devices have,however, generally required special design of the stack and have not generally been readily adaptable to existing, conven-tionally designed stacks. Furthermore, these prior devices have generally been relatively expensive to manufacture and have been difficult to maintain and operate due to the rela-tive inaccessibility of much of the apparatus.
SUMM~RY OF THE INVENTION
In accordance with the present invention, an improved stack gas scrubbing apparatus is provided which may readily be installed within and used in connection with the operation of existing, conventionally designed stacks of a wide range of design configurations and operational characteristics. This is accomplished by providing a clarifier which is supported within the interior of a conventional stack by a hanging mechansim engaging the top rim of the stack and extending down-wardly from the open top thereof to support the operational components of the clarifier concen~rically within the stack in spaced relation to the open top~ The apparatus includes a . , ~ .
plurality of liquid spray nozzles arranged to discharge a scrubbing liquid in an upward and outward direction, with means being provided below the liquid spray nozzles for col-lecting the liquid and the pollutants carried thereby which fall within the stack. Means are also provided for dis-charging a high-pressure stream of gas concentrically within the stack and at a point spaced above the spray nozzles to maintain the desired gas velocity through the stack to assure proper flow of the stack gases through the stack.
In a preferred embodiment of the invention, the con-duit supplying the scrubbing liquid is arranged coaxially within the stack, with the spray nozzles being directed up-wardly and outwardly toward the inner walls of the stack. A
sleeve member, supported by the scrubber support mechanism, surrounds the interior surface of the stack in the vicinity of the nozzles so that liquid reaching the outer portion of the stack will not harm the inner wall structure of the stack Preferably, the slee~-e terminates at its bottom end in an in-wardly and downwardly inclined baffle, or skirt, to direct liquid flowing down the wall inwardly to the means for collecting the excess liquid.
In an alternate embodiment, the conduit supplying the pressure liquid extends externally of the stack structure, and the nozzles themselves are supported on annular conduits or manifolds with the nozzles projecting through openings in the stack wall to direct the liquid spray in inwardly and up-wardly inclined paths merging towa~d the conduit for the pres-sured gas arranged centrally within the stack~
~ -1~4~46 BRIEF DESCRIPTION OF THE DRAWING
_ The foregoing structure and its operation will become more apparent from the following detailed description, taken in conjunction with the drawings, in which:
Fig. 1 is a schematic illustration of a stack gas clarifying system according to the present invention;
Fig. 2 is a vertical sectional view through the top portion of the stack shown in Fig. 1 and illustrating the structural details of the clarifier; and Fig. 3 is a view similar to Fig. 2 and illustrating an alternate embodiment of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings in detail, a stack of conventional construction and of the type which may be employed with a conventional heating plant, or incinerator, is designated generally by the reference numeral 10. Arranged at a point remote from the stack is a collecting and ettling tank 12 which receives scrubbingli~uid through conduit 14 from the interior of the stack. From the settling and clarifying tank 12, the scrubbing liquid is pumped, as by pump 16, through a filter 18 into a pressurized holding tank 20 from which it flows under pressure through liquid supply conduit 22 to the scru~ing apparatus illustrated in Figs. 2 and 3 and supported on the open top of the stack 10.
Referring first to the embodiment of the invention illustrated in Fig. 2, a rigid support ring 24 is adapted to be seated upon the top edge of the`wall 26 of stack 10, with the top of the stack being received in an undercut groove 28 , .
in ring 24. A plurality of metal hanger bars 30 are rigi~ly welded to the ring 24 and extend downwardly at a slight in-clined angle within the stack 10 to support the scrubber as-sembly within the stack.
The scrubber assembly supported on the hanger bars 30 is indicated generally by the reference numeral 32 and com-prises three concentric conduits, the innermost of which is the upper end of p~essure supply conduit 22. A plurality of spray nozzles 34 are mounted on the top end portion of conduit 22, with the nozzles extending upwardly and outwardly to the walls of the outer concentric conduit 36. Preferably the nozzles 34 are arranged in two vertically spaced, circumferentially off-set rings each including a plurality of nozzles substantially l equally spaced therearound, with the nozzles in the two rings ; 15 being inclined at approximately 45 degrees from the horizontal to thereby direct the liquid spray in the desired upwaxd and outward direction.
The central concentric conduit 38 has its upper and lower ends enclosed, as by annular flanges 40, 42, respectively, ; through which the inner conduit 22 passes, and the botto~ end of conduit 38 is connected in fluid communication with the out-let conduit 14.
The outermost concentric conduit 36 has its lower end connected to a supply-tube 46 which, in turn, is connected ; 25 to a blower 48 (Fig. 1) for supplying pressure air to be discharged through a nozzle 50 mounted on the top end of conduit 36 to produce, by an aspiration effect, an increased velocity to stack gas to be scrubbed rising within the stack and thereby compensate for any reduced velocity caused hy ~, ; - 5 -lQ~3~44~
the liquid spray. The blower 43 may simply supply compressed air or alternatively may draw a portion of the gas to be scrubbed, which is otherwlse directed into the base of the stack through conventional entry means (not shown), and increase the pressure of this gas before it is discharged into the top of the stack.
An upwardly open annular, substantially V-shaped trough, or funnel 52, is formed around the outer periphery of the outer concentric conduit 36 in position to catch scrubbing liquid falling downwardly in the central portion of the stack 10.
This liquid is conveyed, through two short drain tubes 54 in-wardly into conduit 38 through which it flows downwardly and into conduit 14 to be conveyed to settling tank 12. A second annular, upwardly open trough member 56 is spaced below the ' trough 52, with the outer periphery trough 56 having an outer !: 15 diameter substantially equal to the diameter of the interior ; of the stack wall 26 and having an inner diameter substantially greater than the diameter of the outer concentric conduit 36.
; Trough 56 is supported by a pair of short drain tubes 58 which are in fluid communication with the interior of the concentric tube 38. It is also noted that the outer diameter of the upper trough 52 is substantially equal to or slightly greater than the inner diameter of the trough 56 whereby there is no direct path downward through the stack so that scrubbing liquid dis-charged from the nozzles will tend to fall into one or the other of the two collecting troughs.
A cylindrical sleeve 60 having an outside diameter substantially equal to the inner d~ameter of the stack 10 is mounted on the outer concentric conduit 36 by suitable upport -~~'~''' ~0~446 arms 62. The sleeve 60 provides a shield for the inner sur-face of the stack walls 26 in the area of the liquid spray discharged from the nozzles 34 to protect the stack wall from the errosive and corrosive effect of the liquid and to pre-vent the liquid from collecting on and running down the wallsof the stack. To this end, an inwardly and downwardly in-clined annular baffle 64 is formed on the bottom end of the sleeve 60 to direct collected liquid into the interior portion of the stack to be collected by the troughs 52 and 56.
Mounted on the hanging bars 30 above the gas discharge nozzle 50, as by mounting bracket 66, is an aspirator assembly for increasing the flow velocity through the stack to compen-sate for any reduction in velocity, or back pressure, created by the liquid scrubbing operation. This aspirator assembly consists of a hollow frusto-conical member 68 mounted coaxially with and having its base spaced slightly above the discharge nozzle 50 and its smaller upper end positioned within the large open end of a venturi section 70. Thus, high pressure air discharged from the nozzle 50 will enter the larger open base of the conical member 68 and, at the same time, entrain stack gases into the cone, by an aspirator effect, to increase the velocity of the stack gases. This mixture of high pressure air and stack gases will, in turn, be discharged into the en-larged entrance of the venturi 70 to further increase the velocity of stack gases entering into the open base of the venturi around the conical member 68.
The embodiment illustrated `in Fig. 3 differs from that just described primarily in that the liquid scrubbing solution ~' :
105'44~6 is discharged into the stack gases in an inwardly and up-wardly inclined direction rather than the outwardly and up-wardly inclined direction just described. To this end, pres-sure inlet conduit 22 is mounted outside the stack rather than concentrically within the return conduit 38 and pressure gas conduit 36. Apart from this, the collection conduit, pressure gas conduit, and the liquid collection system supported con-centrically within the stack are identical to that described and like reference numerals are applied thereto. It could also be mentioned that, by directing the scrubbing liquid in-wardly, the necessity for the lining sleeve 60 of the embodi-ment of Fig. 2 might not be required in the Fig. 3 embodiment and is not illustrated~ Similarly~ the aspirator of Fig~ 2 is not illustrated in the Fig. 3 embodiment, although it will be apparent that either of these structures may be used if desired.
The nozzles 134 employed to spray the scrubbing liquid into the stack gases are mounted on manifolds 135 connected in fluid communication with the conduit 22, with the nozzles 134 themselves projecting through openings formed in the wall 26 of the stack 10.
As illustrated in phantom lines in Fig. 3, the various supply and drain conduits may, if desired, be extended through the walls of the stack 10 at a point below the scrubbing assem-bly to facilitate maintenance of the plumbing and to removethese components from the hostile atmosphere which may exist within the stack. However, it may be desirable to maintain at least the pressure air conduit within the stack throughout 1~4446 a major portion of the stack height. Particularly where the hot combustion gases are employed as the pressure gas, to prevent excessive cooling which could result by placing the conduit outside the stack throughout the major portion of the height.
While I have disclosed and described preferred embodi-ments of my invention, I wish it understood that I do not intend to be restricted solely thereto, but rather that I do intend to include all embodiments thereof which would be ap-parent to one skilled in the art of which comes within thespirit and scope of my invention.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A stack gas clarifying apparatus for mounting within a smokestack to remove particulate and soluble gaseous pollu-tants from stack gases passing upwardly through the smokestack, said apparatus comprising, in combination, support means for engaging the top portion of a smokestack to support the clarify-ing apparatus within the smokestack with which it is to be used, a plurality of arms mounted on and projecting downwardly and inwardly from said support means, a scrubber assembly mounted on said arms and including first and second concentric conduits rigidly joined together and mounted on said arms in position to extend in substantially coaxial relation with the smokestack within which the clarifying apparatus is supported by said support means, inlet means for directing gas under pressure into said first concentric conduit, outlet means operatively connected to the lower end portion of said second conduit, liquid collecting trough means in the form of a plurality of annular, upwardly open fluid collecting troughs extending around said concentric conduits in vertically spaced relation to one another, drain means providing fluid communication between said troughs and said second conduit, gas discharge means on the top end portion of said first conduit for directing a stream of gas under pressure upwardly through the central portion of the stack above said concentric conduits, a plurality of liquid spray nozzles mounted above said trough means in a position to discharge liquid under pressure in an upwardly inclined direction within the stack with which the apparatus is used, and third conduit means operatively connected to said nozzles for supplying scrubbing liquid thereto.
2. The stack gas clarifying apparatus as defined in claim 1, further including aspirator means mounted above and in co-axial arrangement with said gas discharge means whereby gas under pressure discharged from said discharge means will pass through said aspirator and thereby induce an increased stack gas velocity in the top portion of the stack above said nozzles.
3. The apparatus as defined in claim 1 wherein said third conduit means is supported in concentric relation with said first and second concentric conduits, and wherein said plurality of nozzles are supported in position to direct said scrubbing liquid in an upward and outward directed spray within the smokestack.
4. The apparatus as defined in claim 3 further comprising an elongated substantially cylindrical sleeve having a diameter substantially equal to the diameter of the stack and mounted in outward spaced relation to said nozzles, said sleeve terminating at its lower end in an inwardly and downwardly directed baffle to direct liquid flowing thereover inward away from the inner surface of the stack.
5. The apparatus as defined in claim 4 wherein said third conduit is the innermost of the concentric conduits and said first concentric conduit is the outermost.
6. The apparatus as defined in claim 5 wherein said drain means comprises a plurality of drain tubes extending from said troughs inwardly through said first concentric con-duit and joined in fluid communication with said second con-centric conduit.
7. The apparatus as defined in claim 1 further com-prising manifold means extending around said first and second concentric conduits and in outwardly spaced relation thereto a distance sufficient to extend around the outer periphery of a stack with which the apparatus is used, said plurality of nozzles being mounted on said manifold means and adapted to extend through openings formed in the wall of the smoke-stack with which the apparatus is used, said third conduit being operatively connected to said manifold means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA275,781A CA1094446A (en) | 1977-04-06 | 1977-04-06 | Stack gas clarifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA275,781A CA1094446A (en) | 1977-04-06 | 1977-04-06 | Stack gas clarifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1094446A true CA1094446A (en) | 1981-01-27 |
Family
ID=4108349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA275,781A Expired CA1094446A (en) | 1977-04-06 | 1977-04-06 | Stack gas clarifier |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1094446A (en) |
-
1977
- 1977-04-06 CA CA275,781A patent/CA1094446A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |