Vapor reactor

• US 4,005,999 A
• Filed: 03/03/1975
• Issued: 02/01/1977
• Est. Priority Date: 03/03/1975
• Status: Expired due to Term

• Current Assignee: Drexel T. Carlson
• Original Assignee: Drexel T. Carlson
• Inventors: Carlson, Drexel T.
• Primary Examiner(s): Lutter, Frank W.
• Assistant Examiner(s): Lacey, David L.
• Application Number:
  US05/554,631
• Time in Patent Office: 701 Days
• Field of Search: 55/84, 55/93, 55/95, 55/226, 55/244, 55/247, 55/248, 55/261, 55/263, 55/83, 55/222, 55/239, 55/249, 55/266, 55/267, 55/269, 261/119 R, 261/125, 261/DIG. 54, 261/16, 261/17
• US Class Current: 95/221
• CPC Class Codes: B01D 47/024 by impinging the gas to be cleaned essentially in a perpendicular direction onto the liquid surface
• CPC Class Codes: Y10S 261/54 Venturi scrubbers

Abstract

Improvements in air pollution control and polluted gas effluent treatment, both processes and apparatus; Processes and devices for sequentially several times drawing a polluted gas stream against a liquid surface under a barrier approaching the liquid surface, while adding ambient air to the stream between impacts; Processes and devices for humidifying a polluted gas stream by first drawing the stream in impact against a liquid body surface, thereafter nucleating the humidified gas stream by adding ambient air thereto, and finally again drawing the now nucleated gas stream into impact against a liquid body surface to remove the polluting particulates therefrom; Single vessel and multiple vessel multi-stage processes of treating polluted gas streams by drawing same into first impacting humidification, thereafter ambient air addition-nucleation followed by further draw-through impaction.

Claims

1. A process of treating hot, polluted gas having particulate matter therein, which hot, polluted gas is at a temperature substantially above ambient air temperature, comprising the steps of:

sequentially twice drawing a continuous stream of the polluted gas downwardly to impact against the surface of a body of water, thereby to substantially saturate and humidify the hot gas stream,

each time while passing the gas stream under a separate barrier subsequent to each impact, each barrier closely approaching the water body surface,

with the said humidified, polluted gas stream being drawn upwardly between said impacts into an ambient air addition zone,

each impaction serving both to humidify the hot polluted gas stream and remove some of the larger particles carried thereby therefrom,

continuously mixing ambient air having a lower temperature than that of the humidified, particulate carrying, polluted gas stream with the said gas stream in said ambient air addition zone between the impacts thereof on the surface,

sufficient ambient air being added to said gas stream in said zone to take the total gas volume in the ambient air addition zone below the dew point at the overall temperature and pressure conditions existing in said zone,

thereby transforming the said humidified, polluted gas stream from a state of substantial saturation to supersaturation with nucleation and agglomeration of the particulate matter therewithin into larger particles,

all of the said operations on said hot polluted gas stream taking place within continuously connected, confined spaces, whereby the drawing of said stream therethrough creates a rarefaction which somewhat lowers the boiling point of the water.

2. A process as in claim 1 wherein the incoming polluted gas stream before the first impaction is already humidified and including the step of adding ambient air to the stream of humidified, polluted gas prior to the first impact.

3. A process as in claim 1 wherein the second barrier is in contact with the liquid body surface.

4. A process of treating hot, polluted gas having particulate matter therein, which hot, polluted gas is at a temperature substantially above ambient air temperature, comprising the steps of:

sequentially thrice drawing a continuous stream of the polluted gas downwardly in impact against the surface of a body of water, thereby to substantially saturate and humidify the hot gas stream,

each time while passing the gas stream under a separate barrier subsequent to each impact, each said barrier closely approaching the water body surface,

with the said humidified, polluted gas stream being drawn upwardly between each of said impacts before being returned downwardly for the next impact,

each impaction serving both to humidify the hot polluted gas stream and remove some of the larger particles carried thereby therefrom,

and continuously mixing ambient air having a lower temperature than that of the humidified, particulate carrying, polluted gas stream with the said gas stream in an ambient air addition zone between the first and second impacts thereof on the surface,

sufficient ambient air being added to said gas stream in said zone to take the total gas volume in the ambient air addition zone below the dew point at the overall temperature and pressure conditions existing in said zones,

thereby transforming the said humidified, polluted gas stream from a state of substantial saturation to supersaturation with nucleation and agglomeration of the particulate matter therewithin into larger particles,

all of the said operations on said hot polluted gas stream taking place within continuously connected, confined spaces, whereby the drawing of said stream therethrough creates a rarefaction which somewhat lowers the boiling point of the water.

5. A process as in claim 4 wherein the incoming polluted gas stream before the first impaction is already humidified and including the step of adding ambient air to the stream of humidified, polluted gas prior to the first impact.

6. A process as in claim 4 wherein the third barrier is in contact with the liquid body surface and the second barrier very closely approaches the surface.

7. A process as in claim 4 including additionally continuously mixing ambient air with said stream in a second ambient air addition zone between the second and third impacts thereof on the surface,

sufficient ambient air being added to take the total gas volume in the said second ambient air addition zone below the dew point at the overall conditions existing in said zone.

8. A process of treating a hot, polluted gas containing particulate matter therein, which hot, polluted gas is at a temperature substantially above ambient air temperature, comprising the steps of:

continuously drawing a stream of said polluted gas through an enclosed vessel having inlet and outlet gas flow lines wherein, through reversing passageways in said vessel, the polluted gas stream is sequentially twice impacted downwardly on the surface of at least one body of water contained in the vessel,

each time while passing the gas stream under a separate barrier subsequent to each impact, each barrier closely approaching said water body surface, thereby to substantially saturate and humidify the hot gas stream,

with the said polluted gas stream being drawn upwardly between said impacts into an ambient air addition zone,

each impaction serving both to humidify the hot polluted gas stream and remove some of the larger particles carried thereby therefrom,

continuously adding ambient air having a lower temperature than that of the humidified, particulate carrying, polluted gas stream to the said stream in said separate ambient air addition zone in said vessel between said impacts thereof on the surface,

sufficient ambient air being added to said gas stream in said ambient air addition zone so as to take the total gas volume in the said ambient air addition zone below the dew point at the overall temperature and pressure conditions existing in said zone, thereby transforming the said humidified, polluted gas stream from a state of substantial saturation to supersaturation with nucleation and agglomeration of the particulate matter therewithin into larger particles,

the drawing of said stream through said enclosed vessel creating a condition of rarefaction which somewhat lowers the boiling point of the water.

9. A process as in claim 8 wherein the drawing of said stream through said vessel is accomplished by a fan on the vessel outlet line.

10. A process as in claim 8 wherein the ambient air is brought into contact with the gas stream by blower means forcing same into said vessel.

11. A process of treating a hot, polluted gas containing particulate matter, which hot, polluted gas is at a temperature substantially above ambient air temperature, comprising the steps of:

continuously drawing a stream of said polluted gas through an enclosed vessel having inlet and outlet gas flow lines thereon, wherein, through reversing passageways in said vessel, the polluted gas stream is sequentially thrice downwardly impacted on the surface of at least one body of water contained in the vessel,

each time while passing the gas stream under a separate barrier subsequent to each impact, each barrier closely approaching the water body surface, thereby to substantially saturate and humidify the hot gas stream,

with the said humidified, polluted gas stream being drawn upwardly between said impacts into ambient air addition zones,

each impaction serving both to humidify the hot polluted gas stream and remove some of the larger particles carried thereby therefrom,

continuously adding ambient air having a lower temperature than that of the humidified particulate carrying polluted gas stream to the said stream in said ambient air addition zone in said vessel between the first and second impacts,

sufficient ambient air being added to said gas stream in said zone to take the total gas volume in the ambient air addition zone below the dew point at the overall temperature and pressure conditions existing in said zone,

thereby transforming the said humidified, polluted gas stream from a state of substantial saturation to supersaturation with nucleation and agglomeration of the particulate matter therewith into larger particles,

the drawing of the said stream through said enclosed vessel creating a condition of rarefaction which somewhat lowers the boiling point of the water.

12. A process as in claim 11 including continuously adding ambient air to the said stream in a second ambient air addition zone in said vessel between the second and third impacts,

sufficient ambient air being added in said second ambient air addition zone to take the total gas volume in said second ambient air addition zone below the dew point at the overall conditions existing in said zone.

13. A process as in claim 11 wherein the contaminated gas stream is drawn through said vessel by a fan connected to the outlet of the vessel.

14. A process as in claim 11 wherein the ambient air is brought into contact with the gas stream by blower means forcing same into said vessel.

15. A process of treating a hot, polluted gas containing particulate matter, which hot, polluted gas is at a temperature substantially above ambient air temperature, comprising the steps of:

providing two enclosed chambers, each having gas inlet and outlet and a water body in the lower portion thereof and having gas flow communication therebetween above the water levels therein,

drawing the polluted gas to be cleaned in a continuous, enclosed stream into a first one of said chambers and therethrough above the water level therein, thereafter into the second chamber, and therethrough above its water level and thereafter out of said second chamber,

within each said chamber drawing said polluted gas under a barrier closely approaching the surface of the water body therein an enclosed path, first downwardly to impact upon the water body surface and thereafter laterally under said barrier, thereby to substantially saturate and humidify the hot gas stream, and then upwardly from said impact to exhaust from said chamber,

each impaction serving both to humidify the hot polluted gas stream and remove some of the larger particles carried thereby therefrom,

drawing air into said gas stream in an ambient air addition zone as it passes from the first to the second chamber,

sufficient ambient air being added to said gas stream in said zone to take the total gas volume in the ambient air addition zone below the dew point at the overall temperature and pressure conditions existing in said zone,

thereby transforming the said humidified, polluted gas stream from the state of substantial saturation to supersaturation with nucleation and agglomeration of the particulate matter therewithin into larger particles,

the drawing of said stream through said enclosed chambers creating a condition of rarefaction which somewhat lowers the boiling point of the water.

16. A process as in claim 15 wherein the incoming polluted gas stream to the first chamber before the first impaction is already humidified and including the step of adding ambient air to the stream of humidified, polluted gas prior to the first impact.

17. A process as in claim 15 wherein the polluted gas stream is drawn through said chambers by a fan connected to the outlet of the second chamber.

18. A process as in claim 15 wherein the ambient air is brought into contact with the gas stream by blower means forcing same into said gas stream.

19. A process of treating a hot, polluted gas containing particulate matter, which hot, polluted is at a temperature substantially above ambient air temperature, comprising the steps of:

providing three enclosed chambers each having a gas inlet and outlet and a water body in the lower portion thereof and having gas flow connections between a first and second and the second and third ones thereof above the water levels therein,

drawing the polluted gas to be cleaned in a continuous enclosed stream into the first of said chambers, therethrough above the water level therein, thereafter into and through the second chamber above its water level and thereafter into, through and out of the third chamber above its water level,

within each said chamber drawing said polluted gas under a barrier closely approaching the surface of the water body therein in an enclosed path, first downwardly to impact upon the water body surface and thereafter laterally under said barrier, thereby to substantially saturate and humidify the hot gas stream, and upwardly from said impact to exhaust from said chamber,

each impaction serving both to humidify the hot polluted gas stream and remove some of the larger particles carried thereby therefrom,

drawing ambient air having a lower temperature than that of the humidified, particulate carrying, polluted gas stream into said gas stream in an ambient air addition zone as it passes from the first to the second chamber,

sufficient ambient air being added to said gas stream in said zone to take the total gas volume in said ambient air addition zone below the dew point at the overall temperature and pressure conditions existing in the zone,

thereby transforming the said humidified, polluted gas stream from a state of substantial saturation to supersaturation with nucleation and agglomeration of the particulate matter therewithin into larger particles,

the drawing of said polluted gas stream through said enclosed chambers and gas flow connections therebetween creating a condition of rarefaction therewithin which somewhat lowers the boiling point of the water.

20. A process as in claim 19 wherein the incoming polluted gas stream is already humidified before the first impaction and including the step of adding ambient air to the stream of humidified, polluted gas prior to the first impact.

21. A process as in claim 19 wherein the polluted gas stream is drawn through said chambers by a fan connected to the outlet from the third chamber.

22. A process as in claim 19 wherein the ambient air is brought into contact with the gas stream by blower means forcing same into said gas stream.

23. A process as in claim 19 including the step of additionally drawing ambient air into said gas stream in a second ambient air addition zone as it passes from the second to the third chamber,

sufficient ambient air being added to take the total gas volume in the second ambient air addition zone below the dew point at the overall conditions existing in said zone.

24. A gas scrubber for scrubbing hot, polluted gas containing particulate matter, which hot, polluted gas is at a temperature substantially above ambient air temperature, comprising, in combination:

a pair of enclosed chambers each having a body of water in the lower portion thereof,

a substantially vertical wall in each chamber dividing at least the upper portion of the space over the water body therein into two zones, each said wall closely approaching the surface of the water body in each chamber with its lowermost extremity,

the upper portion of one zone of each chamber having a gas inlet and the upper portion of the other zone of each chamber having a gas outlet,

a gas flow duct connecting the gas outlet of a first one of said chambers and the gas inlet to the second of said chambers,

an ambient air inlet opening into said gas flow duct and in communication with a source of ambient air, and

means for continuously drawing said hot, polluted gas through said chambers from the gas inlet to the first chamber to the gas outlet of the second chamber, thereby to substantially saturate and humidify the hot gas stream in each chamber, and

further drawing sufficient ambient air through said inlet opening into said flow duct that the total gas volume in said flow duct is taken below the dew point at the overall temperature and pressure conditions existing therein, thereby transforming the said humidified, polluted gas from a state of substantial saturation to supersaturation with nucleation and agglomeration of the particulate matter therewithin into larger particles,

said means for continuously drawing said gas also operative to create a condition of rarefaction in said chambers which somewhat lowers the boiling point of the water therein.

25. A gas scrubber as in claim 24 wherein the gas and ambient drawing means comprises a fan connected to the gas outlet of the second chamber.

26. A gas scrubber as in claim 24 further including means for blowing said ambient air into said gas flow duct.

27. A gas scrubber for scrubbing hot, polluted gas containing particulate matter, which polluted gas is at a temperature substantially above ambient air temperature, comprising, in combination,

three enclosed chambers each having a body of water in the lower portion thereof,

a substantially vertical wall in each chamber dividing at least the upper portion of the space over the water bodies therein into two zones, each said wall closely approaching the surface of the water body in each chamber with its lowermost extremity,

the upper portion of one zone of each chamber having a gas inlet and the upper portion of the other zone of each chamber having a gas outlet,

two air flow ducts connecting, respectively, the gas outlets of first and second ones of said chambers with the gas inlets of the second and third ones of said chambers, whereby to provide a sequential series flow of gas through the three chambers and the zones thereof,

an ambient air inlet opening into the air flow duct connecting the outlet of the first and inlet of the second chambers and in communication with a source of ambient air and

means for continuously drawing said hot, polluted gas through said chambers through the gas inlet to the first chamber to the gas outlet of the third chamber, thereby to substantially saturate and humidify the hot gas stream in each of said chambers, and

further drawing sufficient ambient air through said inlet opening into said air flow duct that the total gas volume in said air flow duct is taken below the dew point at the overall temperature and pressure conditions existing in said duct,

thereby transforming the said humidified, polluted gas stream from a state of substantial saturation to supersaturation with nucleation and agglomeration of the particulate matter therewithin into larger particles,

said means for drawing said hot polluted gas through said chambers also creating a condition of rarefaction which somewhats lowers the boiling point of the water in each of the chambers.

28. A gas scrubber as in claim 27 wherein the gas drawing means comprises a fan connected to the gas outlet of the third chamber drawing gas through the chambers.

29. A gas scrubber as in claim 27 further including means for blowing said ambient air into said gas flow duct.

30. A gas scrubber as in claim 27 including a second ambient air inlet into the air flow duct connecting the outlet of the second and the inlet of the third chambers,

said means for drawing gas through said chambers and drawing ambient air through the inlet opening into the air flow duct between the first and second chambers also operative to draw sufficient ambient air through said second inlet opening into the air flow duct between the second and third chambers so that the total gas volume in the duct between the second and third chambers is taken below the dew point at the overall conditions existing in said duct.