Method and apparatus for cleaning exhaust gas

Claim 3

A method as defined in claim 1, comprising passing the gas leaving the second scrubbing stage through a demisting stage wherein liquid is removed from the gas before it exits from the scrubbing apparatus.

Claim 4

A method as defined in claim 1, comprising directing the gas through openings in an orifice deflector plate which intersects the scroll type passageway, wherein the openings in the deflector plate create a vEnturi effect on the gas as it passes therethrough and the plate deflects at least some of the contaminants from the gas.

Claim 5

A method as defined in claim 1, comprising maintaining the liquid bath at a preselected level.

Claim 6

A method as defined in claim 1, wherein the gas leaving the scroll type passageway passes vertically upwardly through the flow intersecting scrubber pad of the second scrubbing stage, and wherein a wetting liquid is sprayed continuously against the bottom of the scrubber pad.

Claim 7

A method as defined in claim 5, comprising directing the gas through openings in an orifice deflector plate which intersects the scroll type passageway, wherein the openings in the deflector plate create a venturi effect on the gas as it passes therethrough and the plate deflects at least some of the contaminants from the gas.

Claim 8

A method as defined in claim 6, comprising maintaining the liquid bath at a preselected level.

Claim 9

A method as defined in claim 1, comprising adding a wetting agent to said liquid bath.

Claim 10

A method as defined in claim 8, comprising adding a defoaming agent to said liquid bath.

Claim 11

Gas scrubbing apparatus comprising wall means defining a vertical chamber having upper and lower sections; blower means mounted in said upper section; a liquid bath provided in said lower section; gas inlet duct means connected to said lower section for introducing polluted gas into said lower section; a gas cooling spray assembly mounted on said inlet duct means to rapidly cool the gas before it enters said lower section of said chamber; a scroll type baffle assembly mounted in said lower section adjacent said inlet duct means and said liquid bath to direct the gas from said inlet duct means through an upper portion of said bath and thereafter cause the gas and liquid entrained therein to flow through a scroll type, tortuous path to separate at least some of the pollutants from said gas; means for supplying additives to said lower section to enhance the scrubbing action of said bath and scroll assembly on said gas; a scrubber pad mounted in said upper section and intersecting the flow path of the gas; liquid spray means for continuously wettng said scrubber pad during passage of said gas through said pad; and means for maintaining said liquid bath at a preselected level.

Claim 12

Gas scrubbing apparatus comprising wall means defining a vertical chamber having upper and lower sections; blower means mounted in said upper section; a liquid bath provided in said lower section; gas inlet duct means connected to said lower section for introducing polluted gas into said lower section; a gas cooling spray assembly mounted on said inlet duct means to rapidly cool the gas before it enters said lower section of said chamber; a scroll type baffle assembly mounted in said lower section adjacent said inlet duct means and said liquid bath to direct the gas from said inlet duct means through an upper portion of said bath and thereafter cause the gas and liquid entrained therein to flow through a scroll type, tortuous path to separate at least some of the pollutants from said gas; means for supplying additives to said lower section to enhance the scrubbing action of said bath and scroll assembly on said gas; a scrubber pad mounted in said upper section and intersecting the flow path of the gas; liquid spray means for continuously wettng said scrubber pad during passage of said gas through said pad; and means for maintaining said liquid bath at a preselected level.

Claim 13

Gas scrubbing apparatus as defined in claim 10, comprising a demisting pad mounted in said upper section above said scrubber pad, said demisting pad removing liquid from the clean gas before it is exhausted from the scrubbing apparatus by way of said blower means.

Claim 14

Gas scrubbing apparatus as defined in claim 10, said liquid spray means comprising a spray assembly mounted beneath said scrubber pad and having a plurality of nozzles for directing a spray of liquid upwardly against the bottom of said scrubber pad, the liquid from said spray nozzles also serving as a liquid supply source for said liquid bath.

Claim 15

Gas scrubbing apparatus as defined in claim 12, said liquid spray means also including a liquid spray assembly mounted above said scrubber pad for directing a liquid spray downwardly against the top of said scrubber pad.

Claim 16

Gas scrubbing apparatus as defined in claim 13, wherein said spray nozzle assemblies direct fresh water against said scrubber pad, the fresh water also serves as a fresh water makeup source for the liquid bath in said lower section.

Claim 17

Gas scrubbing apparatus as defined in claim 10, wherein said wall means includes an acid resistant, plastic material defining said vertical chamber, and said baffle assembly includes a plurality of baffle members constructed of acid resistant plastic material, one of said baffle members extending vertically within said lower section opposite said inlet duct means, a heat shield mounted on said one baffle member in facing relationship to said inlet duct means so that a hot gas introduced through said inlet duct means will engage said heat shield and be deflected downwardly into said liquid bath.

Claim 18

Gas scrubbing apparatus as defined in claim 15, said heat shield being loosely mounted on said one baffle member to permit expansion and contraction of the heat shield under varying temperature conditions.

Claim 19

Gas scrubbing apparatus as defined in claim 16, wherein said baffle members are constructed of polyvinylchloride plastic material and said heat shield is constructed of polypropylene plastic material.

Claim 20

Gas scrubbing apparatus as defined in claim 10, said baffle assembly including orifice deflector plate means intersecting said scroll type path and including a plurality of openings through which the gas may flow.

Claim 21

Gas scrubbing apparatus as defined in claim 18, said orifice plate means comprising a pair of spaced deflector plates, each having a plurality of openings, the openings in one of the plates being offset from alignment with the openings in the other plate.

Claim 22

Gas scrubbing apparatus as defined in claim 10, wherein said inlet duct means is inclined downwardly toward a lower section so that the liquid from said gas cooling spray assembly flows into the liquid bath in said lower section.

Claim 23

Gas scrubbing apparatus as defined in claim 20, wherein said gas cooling spray assembly includes a plurality of spaced apart spray nozzles, at least some of said spray nozzles being axially spaced apart and at least some of said spray nozzles being circumferentially spaced apart around said inlet duct means to provide a rapid, progressive cooling action on the gas passing through said inlet duct means.

Claim 24

Gas scrubbing apparatus as defined in claim 10, wherein said means for maintaining said bath at a preselected level comprises a drain pipe assembly having a conduit extending through a wall of said lower section, and overflow means adjustably connected to the inner end of said conduit within said lower section to selectively establish the operating level of said liquid bath.

Claim 25

Gas scrubbing apparatus as defined in claim 22, wherein said overflow means comprise a pipe elbow rotatably connected to the inner end of said conduit and being adjustable so that its open end establishes the overflow level of said bath.

Claim 26

Gas scrubbing apparatus comprising wall means defining a chamber; blower means mounted in said chamber for moving gas therethrough; a liquid bath provided in said chamber; inlet duct means connected to said wall means for introducing gas into said chamber; and a scroll type baffle assembly mounted in said chamber adjacent said inlet duct means and said liquid bath to direct the gas from said inlet duct means through an upper portion of said bath and thereafter cause the gas and liquid entrained therein to flow through a scroll type, tortuous path to separate at least some of the pollutants from said gas; said scroll type baffle assembly including orifice deflector plate means intersection said scroll type path comprising a pair of spaced deflector plates, each having a plurality of openings through which the gas may flow, with the openings in one of the plates being offset from the openings in the other plate.

Claim 27

Gas scrubbing apparatus comprising wall means defining a chamber; blower means mounted in said chamber for moving gas therethrough; a liquid bath provided in said chamber; inlet duct means connected to said wall means for introducing gas into said chamber; and a scroll type baffle assembly mounted in said chamber adjacent said inlet duct means and said liquid bath to direct the gas from said inlet duct means through an upper portion of said bath and thereafter cause the gas and liquid entrained therein to flow through a scroll type, tortuous path to separate at least some of the pollutants from said gas; said scroll type baffle assembly including orifice deflector plate means intersection said scroll type path comprising a pair of spaced deflector plates, each having a plurality of openings through which the gas may flow, with the openings in one of the plates being offset from the openings in the other plate.

Claim 28

Gas scrubbing apparatus as defined in claim 24, said wall means defining said chamber being constructed of an acid resistant plastic material, said baffle assembly including a plurality of baffle members constructed of acid resistant plastic material, one of said baffle members extending vertically within said chamber opposite said inlet duct means, a heat shield mounted on said one baffle member in facing relationship to said inlet duct means so that a hot polluted gas introduced through said inlet duct means will engage said heat shield and be deflected downwardly into said liquid bath.

Claim 29

Gas scrubbing apparatus as defined in claim 25, said heat shield being loosely mounted on said one baffle member to permit expansion and contraction of said heat shield under varying temperature conditions.

Claim 30

Gas scrubbing apparatus as defined in claim 26, wherein said baffle members and said orifice deflector plates are Constructed of polyvinylchloride plastic material and said heat shield is constructed of polypropylene plastic material.

Claim 31

Gas scrubbing apparatus as defined in claim 25, comprising gas cooling spray means mounted on said inlet duct means to rapidly cool the gas before it enters said chamber.

Claim 32

Gas scrubbing apparatus as defined in claim 28, said gas cooling spray means including a plurality of spaced apart, fresh water spray nozzles, at least some of said spray nozzles being circumferentially spaced apart around said inlet duct means to rapidly cool the gas, said inlet duct means being inclined downwardly toward said chambr so that the fresh water from said nozzles will flow into said chamber and act as a fresh water supply source for said liquid bath.

Claim 33

Gas scrubbing apparatus comprising wall means defining a vertical chamber having upper and lower sections; blower means mounted in said upper section; a liquid bath provided in said lower section; gas inlet duct means connected to and inclined downwardly toward said lower section for introducing polluted gas into said lower section; a scroll type baffle assembly mounted in said lower section adjacent said inlet duct means and said liquid bath to direct the polluted gas from said inlet means through an upper portion of said bath and thereafter cause the gas and liquid entrained therein to flow through a scroll type tortuous path to separate at least some of the pollutants from said gas; means for supplying additives to said lower section to enhance the scrubbing action of said bath and scroll assembly on said gas; said baffle assembly including orifice deflector plate means intersecting the scroll type path and having a plurality of openings through which the gas may flow; means connected to said lower section for maintaining said liquid bath at a preselected level; a gas cooling fresh water spray assembly mounted on said inlet duct means to rapidly cool the gas before it enters said lower section; a scrubber pad mounted in said upper section and intersecting the flow path of the gas; fresh water spray means comprising spray nozzles mounted above and below said scrubber pad for continuously wetting said scrubber pad during passage of said gas through the pad; and a demister pad mounted in said upper section for removing water from the clean air before it is exhausted from said scrubbing apparatus by way of said blower means.

Claim 34

Gas scrubbing apparatus comprising wall means defining a vertical chamber having upper and lower sections; blower means mounted in said upper section; a liquid bath provided in said lower section; gas inlet duct means connected to and inclined downwardly toward said lower section for introducing polluted gas into said lower section; a scroll type baffle assembly mounted in said lower section adjacent said inlet duct means and said liquid bath to direct the polluted gas from said inlet means through an upper portion of said bath and thereafter cause the gas and liquid entrained therein to flow through a scroll type tortuous path to separate at least some of the pollutants from said gas; means for supplying additives to said lower section to enhance the scrubbing action of said bath and scroll assembly on said gas; said baffle assembly including orifice deflector plate means intersecting the scroll type path and having a plurality of openings through which the gas may flow; means connected to said lower section for maintaining said liquid bath at a preselected level; a gas cooling fresh water spray assembly mounted on said inlet duct means to rapidly cool the gas before it enters said lower section; a scrubber pad mounted in said upper section and intersecting the flow path of the gas; fresh water spray means comprising spray nozzles mounted above and below said scrubber pad for continuously wetting said scrubber pad during passage of said gas through the pad; and a demister pad mounted in said upper section for removing water from the clean air before it is exhausted from said scrubbing apparatus by way of said blower means.

Claim 35

Gas scrubbing apparatus as defined in claim 30, wherein said wall means and said baffle means are constructed from acid resistant plastic material, and said baffle means includes a vertical baffle member extending vertically within said lower section opposite said gas inlet duct means, and a heat sield is mounted on said one baffle member in facing relationship to said inlet duct means to deflect the gas entering said lower section downwardly into said liquid bath.

Claim 36

Gas scrubbing apparatus as defined in claim 31, wherein said heat shield is loosely mounted on said vertical baffle member to permit expansion and contraction of said heat shield under varying temperature conditions.

Claim 37

Gas scrubbing apparatus as defined in claim 31, wherein said wall means and said baffle means are constructed of polyvinylchloride plastic material, and said heat shield is constructed of polypropylene plastic material.

Claim 38

Gas scrubbing apparatus as defined in claim 33, said inlet duct means comprising a first inlet duct connected at its inner end to said wall means and constructed of polyvinylchloride plastic material, and a second corrosion resistant metal spray duct connected to the outer end of said first duct, said fresh water spray assembly being mounted on said spray duct.

Claim 39

A gas cleaning system particularly useful for removing pollutants from a gas exhausted from a glass coating station at which a substance such as stannic chloride is deposited on glass articles to form a coating thereon and some of the substance is carried off as one of the pollutants in the exhaust gas, comprIsing gas collection means for collecting the polluted exhaust gas from said coating station, gas scrubbing apparatus having blower means, conduit means connecting said collection means to said scrubbing apparatus, said blower means drawing said gas from said coating station through said collection means and conduit means into said scrubbing apparatus, heating means associated with said collection means for heating the exhaust gas, first liquid spray means mounted on said conduit means adjacent said scrubbing apparatus and introducing a cooling liquid into said gas prior to entry of said gas into said scrubbing apparatus, said scrubbing apparatus comprising a vertical chamber having upper and lower sections, said blower means being mounted in said upper section, a liquid bath provided in said lower section, gas inlet duct means connected to said lower section for introducing the polluted gas from said conduit means into said lower section, a scroll type baffle assembly mounted in said lower section adjacent said inlet duct means and said liquid bath to direct the gas from said inlet duct means through an upper portion of said bath and thereafter cause the gas and liquid entrained therein to flow through a scroll type tortuous path to separate at least some of the pollutants from the gas, means for supplying additives to said lower section to enhance the scrubbing action of said bath and scroll assembly on said gas, a scrubber pad mounted in said upper section and intersecting the flow path of the gas, and second liquid spray means for continuously wetting said scrubber pad during passage of said gas through the pad.

Claim 40

A gas cleaning system particularly useful for removing pollutants from a gas exhausted from a glass coating station at which a substance such as stannic chloride is deposited on glass articles to form a coating thereon and some of the substance is carried off as one of the pollutants in the exhaust gas, comprIsing gas collection means for collecting the polluted exhaust gas from said coating station, gas scrubbing apparatus having blower means, conduit means connecting said collection means to said scrubbing apparatus, said blower means drawing said gas from said coating station through said collection means and conduit means into said scrubbing apparatus, heating means associated with said collection means for heating the exhaust gas, first liquid spray means mounted on said conduit means adjacent said scrubbing apparatus and introducing a cooling liquid into said gas prior to entry of said gas into said scrubbing apparatus, said scrubbing apparatus comprising a vertical chamber having upper and lower sections, said blower means being mounted in said upper section, a liquid bath provided in said lower section, gas inlet duct means connected to said lower section for introducing the polluted gas from said conduit means into said lower section, a scroll type baffle assembly mounted in said lower section adjacent said inlet duct means and said liquid bath to direct the gas from said inlet duct means through an upper portion of said bath and thereafter cause the gas and liquid entrained therein to flow through a scroll type tortuous path to separate at least some of the pollutants from the gas, means for supplying additives to said lower section to enhance the scrubbing action of said bath and scroll assembly on said gas, a scrubber pad mounted in said upper section and intersecting the flow path of the gas, and second liquid spray means for continuously wetting said scrubber pad during passage of said gas through the pad.

Claim 41

A gas cleaning system as defined in claim 35, said gas collection means comprising a hood through which the glass articles pass as they are coated, said hood having open ends through which air enters and an outlet duct through which polluted gas is exhausted, a gas collection duct connected at one end to said conduit means and having a fitting on its other end which is spaced from and adjustable relative to said hood outlet duct to vary the airflow through said hood, and said heating means including a gas burner mounted on said gas collection duct.

Claim 42

A gas cleaning system as defined in claim 35, said heating means comprising a gas burner which produces a temperature sufficient to convert the stannic chloride substance to stannic oxide particles and hydrogen chloride gas.

Claim 43

A gas cleaning system as defined in claim 35, said scrubbing apparatus further comprising a demister pad mounted in said upper section above said scrubber pad, said demister pad removing liquid from the clean gas before it is exhausted from said scrubbing apparatus.

Claim 44

A gas cleaning system as defined in claim 35, wherein said first liquid spray means comprises a spray assembly connected to said inlet duct means for rapidly cooling said gas immediately before it enters said lower section.

Claim 45

A gas cleaning system as defined in claim 39, wherein said inlet duct means is inclined downwardly toward said lower section so that the liquid from said first liquid spray means flows into the bath in said lower section.

Claim 46

A gas cleaning system as defined in claim 39, wherein said first liquid spray means comprises a plurality of spaced apart spray nozzles mounted on said inlet duct means, at least some of said spray nozzles being axially spaced apart and at least some of said spray nozzles being circumferentially spaced apart around said inlet duct means to provide a rapid progressive cooling action on said polluted gas.

Claim 47

A gas cleaning system as defined in claim 39, wherein the liquid from said first and second spray means is fresh water which collects in said lower section and serves as makeup water for said bath, and wherein said apparatus further includes means for maintaining said bath at a preselected level.

Claim 48

A gas cleaning system as defined in claim 35, wherein the walls of said chamber are constructed from an acid resistant plastic material and said baffle assembLy includes a plurality of baffle members of acid resistant plastic material, one of said baffle members extending vertically within said lower section opposite said inlet duct means, a heat shield mounted on said one baffle member in facing relationship with said inlet duct means so that the gas introduced said inlet duct means engages said hat shield and is deflected downwardly into said liquid bath.

Claim 49

A gas cleaning system as defined in claim 43, said heat shield being loosely mounted on said one baffle member to permit expansion and contraction of said heat shield under varying temperature conditions.

Claim 50

A gas cleaning system as defined in claim 44, wherein said baffle members are constructed of polyvinylchloride plastic material and said heat shield is constructed of polypropylene plastic material.

Claim 51

A gas cleaning system as defined in claim 35, said baffle assembly including orifice deflector plate means intersecting said scroll type path and including a plurality of openings through which the gas may flow.

Claim 52

A gas cleaning system as defined in claim 46, said orifice plate means comprising a pair of spaced deflector plates each having a plurality of openings in the other plate.

Claim 53

A gas cleaning system as defined in claim 35, said second liquid spray means being mounted below said scrubber pad and including nozzle means for continuously directing liquid upwardly against the bottom of said scrubber pad.

Claim 54

A gas cleaning system as defined in claim 48, said scrubbing apparatus further comprising third liquid spray means mounted above said scrubber pad and including nozzle means for continuously directing liquid downwardly against the top of said scrubber pad.

Claim 55

A gas cleaning system as defined in claim 49, wherein said second and third liquid spray means spray fresh water against said scrubber pad.

Claim 56

The gas cleaning system as defined in claim 49, said scrubbing apparatus further comprising a demister pad mounted in said upper section above said third spray means, said demister pad removing liquid from the clean gas before it is exhausted from said scrubbing apparatus.