US3581463A - Electrostatic gas cleaning - Google Patents

Electrostatic gas cleaning Download PDF

Info

Publication number
US3581463A
US3581463A US678300A US3581463DA US3581463A US 3581463 A US3581463 A US 3581463A US 678300 A US678300 A US 678300A US 3581463D A US3581463D A US 3581463DA US 3581463 A US3581463 A US 3581463A
Authority
US
United States
Prior art keywords
gases
sulfur dioxide
minor portion
gas stream
electrical precipitation
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 - Lifetime
Application number
US678300A
Inventor
Lawrence M Roberts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Research Cottrell Inc
Original Assignee
Research Cottrell Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Research Cottrell Inc filed Critical Research Cottrell Inc
Application granted granted Critical
Publication of US3581463A publication Critical patent/US3581463A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
    • B03C3/013—Conditioning by chemical additives, e.g. with SO3

Definitions

  • Difficulty has been encountered in the electrical precipitation of suspended particles or fly ash from combustion gases arising from the phenomenon of back discharge due to high resistivity of the particulate material and it has been proposed to overcome this difficulty by catalytically converting sulfur dioxide in the gases to sulfur trioxide to increase the conductivity of the particulate material in the gases.
  • the catalyst rapidly loses its efficiency and the catalyst bed rapidly increases its resistance to the flow of gases therethrough due to the accumulation of particulate matter thereon.
  • combustion gases typically contain a much larger amount of sulfur dioxide than is required to produce the amount of sulfur trioxide desired for effective conditioning of the particulate material for efficient electrical precipitation, it has been found that these difficulties may be avoided by sub jecting only a minor portion of the gases to catalytic sulfur dioxide conversion after removing from such minor portion of the gases a major portion of their suspended particulate matter preferably by electrical precipitation at a high tem' perature, for example, from about 800 to about l,000 F.
  • This minor portion of the gas is then mixed with the main gas stream either before or after it has been cooled, for example, in a combustion air preheater, and the mixed gases are subjected to a conventional electrical precipitation operation.
  • the sulfur dioxide content of the combustion gases coming from the boiler would be about 0.1 percent by volume whereas conversion of from 0.001 percent to 0.005 percent of sulfur dioxide by volume to sulfur trioxide would be effective to adequately condition the gases for efficient electrical precipitation of the fly ash.
  • the auxiliary gas cleaner and catalyst chamber needed for the method of the invention would only have to be large enough, in this case, to handle from 1 percent to 5 percent by volume of the combustion gases.
  • a method of removing suspended matter from combustion gases containing sulfur dioxide which comprises removing from a minor portion of the gases a major portion of the particulate content thereof, subjecting said minor portion of the gases to the action of a catalyst to convert a major portion of the sulfur dioxide content thereof to sulfur trioxide, mixing said minor portion of the gases with the main gas stream and subjecting the mixed gases to electrical precipitation, the amount of sulfur dioxide converted to sulfur trioxide in said minor ortion of the as stream being equivalent to from about 0. 01 percent to a out 0.005 percent by volume of the total gas stream coming from the boiler.

Abstract

Suspended matter is removed from combustion gases containing sulfur dioxide by removing a major portion of the particulate matter from a minor portion of the gases, catalytically converting a major portion of the sulfur dioxide content of said minor portion of the gases to sulfur trioxide, mixing said minor portion of the gases with the main gas stream and subjecting the mixed gases to electrical precipitation.

Description

United States Patent [72] Inventor Lawrence M. Roberts Bound Brook, NJ. 211 Appl. No. 678,300 [22] Filed Oct. 26, 1967 [45] Patented June 1, 1971 [73] Assignee Research-CottrelLlnc. Somerset County, NJ.
[541 ELECTROSTATIC GAS CLEANING 3 Claims, 1 Drawing Fig.
[52] U.S.Cl. 55/4, 23/2, 23/175, 55/5,55/11, 55/106, 55/128, 55/135, 55/ 136 [51] Int. Cl B03c 3/01 [50] Field oiSearch 55/2, 5,11, 101,122,134,135,4,106,128,136;23/2, 2.2, 174, 175
[56] References Cited UNlTED STATES PATENTS 334,158 l/1886 Beard 55/220X 1,291,745 l/l9l9 Bradley 55/5 2,180,727 11/1939 Carter 23/175 2,537,558 1/1951 Tigges 55/124X 2,696,892 12/1954 Campbell 55/122X 2,706,533 4/1955 Hedberg et a1. 55/135X 2,740,493 4/ 1956 Wintermute 55/127X 2,746,563 5/1956 Harlow 23/175X 2,758,666 8/ 1956 Prentiss 55/124X 2,795,401 6/1957 Cooper et a1. 55/135X 2,841,242 7/1958 Hall 23/174X 3,054,243 9/ 1962 Howe 55/1 1 3,132,473 S/1964 Hass 60/29 all- OTHER REFERENCES White, Harry J., industrial Electrostatic Precipitation, Addison-Wesley Publishing Company, 1nc., Reading, Massachusetts, 1963, pages 294, 295, and 303- 305 (copy in Technical Library, Call No. TP 156 p7w5i) Primary Examiner-Dennis E. Talbert, Jr. Attorney-Stowell & Stowell ABSTRACT: Suspended matter is removed from combustion gases containing sulfur dioxide by removing a major portion of the particulate matter from a minor portion of the gases, catalytically converting a major portion of the sulfur dioxide content of said minor portion of the gases to sulfur trioxide, mixing said minor portion of the gases with the main gas stream and subjecting the mixed gases to electrical precipitation.
PATENTEU JUN 1 I971 3,581,463
INVENTUR LAWRENCE. M ROBERTS ATTURNHY ELECTROSTATIC GAS CLEANING This invention relates to the removal of suspended particulate matter from combustion gases containing sulfur dioxide by subjecting the gases to electrical precipitation in a high potential electrostatic field.
Difficulty has been encountered in the electrical precipitation of suspended particles or fly ash from combustion gases arising from the phenomenon of back discharge due to high resistivity of the particulate material and it has been proposed to overcome this difficulty by catalytically converting sulfur dioxide in the gases to sulfur trioxide to increase the conductivity of the particulate material in the gases. However, the catalyst rapidly loses its efficiency and the catalyst bed rapidly increases its resistance to the flow of gases therethrough due to the accumulation of particulate matter thereon.
Since combustion gases typically contain a much larger amount of sulfur dioxide than is required to produce the amount of sulfur trioxide desired for effective conditioning of the particulate material for efficient electrical precipitation, it has been found that these difficulties may be avoided by sub jecting only a minor portion of the gases to catalytic sulfur dioxide conversion after removing from such minor portion of the gases a major portion of their suspended particulate matter preferably by electrical precipitation at a high tem' perature, for example, from about 800 to about l,000 F. This minor portion of the gas is then mixed with the main gas stream either before or after it has been cooled, for example, in a combustion air preheater, and the mixed gases are subjected to a conventional electrical precipitation operation.
In a typical powdered coal boiler installation the sulfur dioxide content of the combustion gases coming from the boiler would be about 0.1 percent by volume whereas conversion of from 0.001 percent to 0.005 percent of sulfur dioxide by volume to sulfur trioxide would be effective to adequately condition the gases for efficient electrical precipitation of the fly ash. Thus the auxiliary gas cleaner and catalyst chamber needed for the method of the invention would only have to be large enough, in this case, to handle from 1 percent to 5 percent by volume of the combustion gases.
The invention will be more particularly described with reference to the accompanying drawing showing diagrammatically an illustrative form of apparatus embodying the principles of the invention.
In the drawing is the main flue leading from the combustion chamber ofa coal fired boiler (not shown) through air preheater ll, electrical precipitator l2 and fan 13 to a chimney stack (not shown). An auxiliary fan 14 draws a small portion of the gases from the main flue and passes them successively through high temperature electrical precipitator l5 and catalyst chamber 16 back to the main flue upstream of the main precipitator I2.
In a typical operation, 2 percent of the combustion gases coming from the boiler at about 800 F. and containing about 0.l percent by volume of sulfur dioxide are passed by fan 14 through electrostatic cleaner 15 through catalyst chamber 16, where substantially all of the sulfur dioxide is converted to sulfur trioxide by catalyst 17 which may be, for example, a vanadium pentoxide catalyst on silica gel granules or any of the commercially available sulfur dioxide oxidation catalysts. The sulfur trioxide containing gas is then returned to the main gas stream which has been cooled to about 300 F. in heat exchanger 11 and the mixed gases are passed through electrical precipitator l2.
lclaim:
l. A method of removing suspended matter from combustion gases containing sulfur dioxide which comprises removing from a minor portion of the gases a major portion of the particulate content thereof, subjecting said minor portion of the gases to the action of a catalyst to convert a major portion of the sulfur dioxide content thereof to sulfur trioxide, mixing said minor portion of the gases with the main gas stream and subjecting the mixed gases to electrical precipitation, the amount of sulfur dioxide converted to sulfur trioxide in said minor ortion of the as stream being equivalent to from about 0. 01 percent to a out 0.005 percent by volume of the total gas stream coming from the boiler.
2. A method of removing suspended matter from combustion gases as defined in claim 1 wherein the particulate content is removed from the minor portion of the gas stream at a temperature of from about 800 to about 1,000 F.
3. A method of removing suspended matter from combustion gases as defined in claim I wherein the particulate content is removed from the minor portion of the gas stream by electrical precipitation at a temperature of about 800 F. to about l,000 F. and particulate content is removed from the mixed gases by electrical precipitation at a temperature of about 300 F.

Claims (2)

  1. 2. A method of removing suspended matter from combustion gases as defined in claim 1 wherein the particulate content is removed from the minor portion of the gas stream at a temperature of from about 800* to about 1,000* F.
  2. 3. A method of removing suspended matter from combustion gases as defined in claim 1 wherein the particulate content is removed from the minor portion of the gas stream by electrical precipitation at a temperature of about 800* F. to about 1,000* F. and particulate content is removed from the mixed gases by electrical precipitation at a temperature of about 300* F.
US678300A 1967-10-26 1967-10-26 Electrostatic gas cleaning Expired - Lifetime US3581463A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US67830067A 1967-10-26 1967-10-26

Publications (1)

Publication Number Publication Date
US3581463A true US3581463A (en) 1971-06-01

Family

ID=24722245

Family Applications (1)

Application Number Title Priority Date Filing Date
US678300A Expired - Lifetime US3581463A (en) 1967-10-26 1967-10-26 Electrostatic gas cleaning

Country Status (1)

Country Link
US (1) US3581463A (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665676A (en) * 1970-11-12 1972-05-30 Koppers Co Inc Method of and apparatus for chemically conditioning a particle-laden gas stream
US3686825A (en) * 1970-04-08 1972-08-29 Lodge Cottrell Ltd Electro-precipitation
US3704569A (en) * 1970-04-02 1972-12-05 Universal Oil Prod Co System for conditioning flue gas with h{11 {11 so{11
US3818682A (en) * 1972-09-25 1974-06-25 Owens Illinois Inc Flue gas temperature control system
US3986848A (en) * 1975-12-22 1976-10-19 Combustion Engineering, Inc. Gas reheating system using hot precipitator
US3989482A (en) * 1971-06-11 1976-11-02 Polysius Ag Method for the removal of dust from exhaust gases
US3993429A (en) * 1974-10-29 1976-11-23 Wahlco, Inc. Gas conditioning means
US4058372A (en) * 1976-06-22 1977-11-15 Air Products And Chemicals, Inc. Flue gas conditioning with spiking gas containing sulfur trioxide
US4070162A (en) * 1976-08-02 1978-01-24 Apollo Chemical Corporation Method of agglomerating particles in gas stream
US4307068A (en) * 1977-08-31 1981-12-22 Mitsubishi Jukogyo Kabushiki Kaisha Method and apparatus for treating an exhaust gas
US4533364A (en) * 1983-02-01 1985-08-06 Electric Power Research Institute, Inc. Method for flue gas conditioning with the decomposition products of ammonium sulfate or ammonium bisulfate
US4770674A (en) * 1984-08-06 1988-09-13 Foster Wheeler Energy Corporation Gas conditioning for an electrostatic precipitator
US5011516A (en) * 1989-11-06 1991-04-30 Electric Power Research Institute, Inc. Catalytic oxidation of SO2 to SO3 in the presence of fly ash
US5196038A (en) * 1990-03-15 1993-03-23 Wright Robert A Flue gas conditioning system
US5240470A (en) * 1992-04-07 1993-08-31 Wilhelm Environmental Technologies, Inc. In-duct flue gas conditioning system
US5261931A (en) * 1990-03-15 1993-11-16 Wilhelm Environmental Technologies, Inc. Flue gas conditioning system
US5288309A (en) * 1992-04-07 1994-02-22 Wilhelm Environmental Technologies, Inc. Flue gas conditioning agent demand control apparatus
US5350441A (en) * 1990-03-15 1994-09-27 Wilhelm Environmental Technologies, Inc. Flue gas conditioning system
US5356597A (en) * 1992-04-07 1994-10-18 Wilhelm Environmental Technologies, Inc. In-duct flue gas conditioning system
US5370720A (en) * 1993-07-23 1994-12-06 Welhelm Environmental Technologies, Inc. Flue gas conditioning system
US5538539A (en) * 1995-01-20 1996-07-23 Wahlco, Inc. Catalytic sulfur trioxide flue gas conditioning
US5665142A (en) * 1994-04-12 1997-09-09 Wilhelm Environmental Technologies, Inc. Flue gas conditioning system and method using native SO2 feedstock
DE19611332A1 (en) * 1996-03-22 1997-09-25 Abb Research Ltd Process for conditioning waste gas
US5980610A (en) * 1997-09-25 1999-11-09 The United States Of America As Represented By The United States Department Of Energy Apparatus and method for improving electrostatic precipitator performance by plasma reactor conversion of SO2 to SO3
US6749670B2 (en) * 2001-03-26 2004-06-15 Shell Oil Company Process for trapping particulate matter in hot gas and trap therefor
US20120058035A1 (en) * 2010-09-06 2012-03-08 Krigmont Henry V System and Method for Flue Gas Conditioning
US20120067213A1 (en) * 2010-09-21 2012-03-22 General Electric Company Method and apparatus for air pollution control

Citations (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US334158A (en) * 1886-01-12 Geoege w
US1284167A (en) * 1916-11-22 1918-11-05 Int Precipitation Co Contact process and apparatus for producing sulfuric acid.
US1291745A (en) * 1918-04-30 1919-01-21 Research Corp Process and apparatus for effecting gas reactions.
US1737320A (en) * 1927-12-17 1929-11-26 Gen Chemical Corp Contact process for manufacturing sulphuric acid
US1969021A (en) * 1932-02-19 1934-08-07 Texas Gulf Sulphur Co Pyritic smelting and recovery of sulphur
US2180727A (en) * 1937-07-24 1939-11-21 Gen Chemical Corp Manufacture of sulphuric acid
US2384926A (en) * 1942-12-17 1945-09-18 Standard Oil Dev Co Process for producing sulphur
US2471072A (en) * 1946-04-03 1949-05-24 Allied Chem & Dye Corp Manufacture of sulfuric acid
US2528103A (en) * 1946-01-07 1950-10-31 Robert M Willson Method of producing sulfuric acid and hydraulic cement from gypsum
US2537558A (en) * 1947-05-10 1951-01-09 Air Preheater Removal of solids from gases
US2696892A (en) * 1951-06-08 1954-12-14 California Portland Cement Co Gas humidifying and electrical precipitation system
US2706533A (en) * 1953-05-22 1955-04-19 Research Corp Gas conditioning method and apparatus
US2740493A (en) * 1953-12-30 1956-04-03 Research Corp Gas cleaning method and apparatus
US2746563A (en) * 1953-06-09 1956-05-22 Koppers Co Inc Purification of gases
US2758666A (en) * 1952-04-10 1956-08-14 Phillips Petroleum Co Carbon black separation
US2768062A (en) * 1952-10-17 1956-10-23 Norddeutsche Affinerie Process and apparatus for increasing the so2 content of converter gases
US2795401A (en) * 1953-09-23 1957-06-11 Air Preheater Precipitator intermediate series air heaters
US2841242A (en) * 1956-08-13 1958-07-01 Cottrell Res Inc Method for electrostatically treating gases
US3022989A (en) * 1954-04-07 1962-02-27 Union Commerce Bank Hydraulic cement process
US3054243A (en) * 1960-09-16 1962-09-18 Walter S Bowie High temperature electrostatic precipitator and method of operation
GB932895A (en) * 1961-09-26 1963-07-31 Carves Simon Ltd Improvements in and relating to the treatment of gases
GB933286A (en) * 1961-03-23 1963-08-08 Lodge Cottrell Ltd Improvements in and relating to electro-precipitation
US3132473A (en) * 1960-07-01 1964-05-12 Union Oil Co Exhaust purifying apparatus and method
US3154389A (en) * 1963-04-30 1964-10-27 Du Pont Device for catalytic exhaust treatment with particle separation
US3162518A (en) * 1963-07-24 1964-12-22 Grace W R & Co Lead removal device
GB1003377A (en) * 1963-03-08 1965-09-02 Metallgesellschaft Ag Apparatus for cooling and/or cleaning hot gases
US3221475A (en) * 1962-04-12 1965-12-07 Metallgesellschaft Ag Wet electrostatic precipitator
FR1445982A (en) * 1965-08-31 1966-07-15 Lodge Cottrell Ltd Electro-precipitation process and electro-precipitator equipment
FR1448415A (en) * 1965-09-17 1966-08-05 Metallgesellschaft Ag Method for increasing the precipitation rate of electrostatic separators

Patent Citations (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US334158A (en) * 1886-01-12 Geoege w
US1284167A (en) * 1916-11-22 1918-11-05 Int Precipitation Co Contact process and apparatus for producing sulfuric acid.
US1291745A (en) * 1918-04-30 1919-01-21 Research Corp Process and apparatus for effecting gas reactions.
US1737320A (en) * 1927-12-17 1929-11-26 Gen Chemical Corp Contact process for manufacturing sulphuric acid
US1969021A (en) * 1932-02-19 1934-08-07 Texas Gulf Sulphur Co Pyritic smelting and recovery of sulphur
US2180727A (en) * 1937-07-24 1939-11-21 Gen Chemical Corp Manufacture of sulphuric acid
US2384926A (en) * 1942-12-17 1945-09-18 Standard Oil Dev Co Process for producing sulphur
US2528103A (en) * 1946-01-07 1950-10-31 Robert M Willson Method of producing sulfuric acid and hydraulic cement from gypsum
US2471072A (en) * 1946-04-03 1949-05-24 Allied Chem & Dye Corp Manufacture of sulfuric acid
US2537558A (en) * 1947-05-10 1951-01-09 Air Preheater Removal of solids from gases
US2696892A (en) * 1951-06-08 1954-12-14 California Portland Cement Co Gas humidifying and electrical precipitation system
US2758666A (en) * 1952-04-10 1956-08-14 Phillips Petroleum Co Carbon black separation
US2768062A (en) * 1952-10-17 1956-10-23 Norddeutsche Affinerie Process and apparatus for increasing the so2 content of converter gases
US2706533A (en) * 1953-05-22 1955-04-19 Research Corp Gas conditioning method and apparatus
US2746563A (en) * 1953-06-09 1956-05-22 Koppers Co Inc Purification of gases
US2795401A (en) * 1953-09-23 1957-06-11 Air Preheater Precipitator intermediate series air heaters
US2740493A (en) * 1953-12-30 1956-04-03 Research Corp Gas cleaning method and apparatus
US3022989A (en) * 1954-04-07 1962-02-27 Union Commerce Bank Hydraulic cement process
US2841242A (en) * 1956-08-13 1958-07-01 Cottrell Res Inc Method for electrostatically treating gases
US3132473A (en) * 1960-07-01 1964-05-12 Union Oil Co Exhaust purifying apparatus and method
US3054243A (en) * 1960-09-16 1962-09-18 Walter S Bowie High temperature electrostatic precipitator and method of operation
GB933286A (en) * 1961-03-23 1963-08-08 Lodge Cottrell Ltd Improvements in and relating to electro-precipitation
GB932895A (en) * 1961-09-26 1963-07-31 Carves Simon Ltd Improvements in and relating to the treatment of gases
US3221475A (en) * 1962-04-12 1965-12-07 Metallgesellschaft Ag Wet electrostatic precipitator
GB1003377A (en) * 1963-03-08 1965-09-02 Metallgesellschaft Ag Apparatus for cooling and/or cleaning hot gases
US3154389A (en) * 1963-04-30 1964-10-27 Du Pont Device for catalytic exhaust treatment with particle separation
US3162518A (en) * 1963-07-24 1964-12-22 Grace W R & Co Lead removal device
FR1445982A (en) * 1965-08-31 1966-07-15 Lodge Cottrell Ltd Electro-precipitation process and electro-precipitator equipment
FR1448415A (en) * 1965-09-17 1966-08-05 Metallgesellschaft Ag Method for increasing the precipitation rate of electrostatic separators

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
White, Harry J., Industrial Electrostatic Precipitation, Addison-Wesley Publishing Company, Inc., Reading, Massachusetts, 1963, pages 294, 295, and 303 305 (copy in Technical Library, Call No. TP 156 p7w5i) *

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704569A (en) * 1970-04-02 1972-12-05 Universal Oil Prod Co System for conditioning flue gas with h{11 {11 so{11
US3686825A (en) * 1970-04-08 1972-08-29 Lodge Cottrell Ltd Electro-precipitation
US3665676A (en) * 1970-11-12 1972-05-30 Koppers Co Inc Method of and apparatus for chemically conditioning a particle-laden gas stream
US3989482A (en) * 1971-06-11 1976-11-02 Polysius Ag Method for the removal of dust from exhaust gases
US3818682A (en) * 1972-09-25 1974-06-25 Owens Illinois Inc Flue gas temperature control system
US3993429A (en) * 1974-10-29 1976-11-23 Wahlco, Inc. Gas conditioning means
US3986848A (en) * 1975-12-22 1976-10-19 Combustion Engineering, Inc. Gas reheating system using hot precipitator
US4058372A (en) * 1976-06-22 1977-11-15 Air Products And Chemicals, Inc. Flue gas conditioning with spiking gas containing sulfur trioxide
US4070162A (en) * 1976-08-02 1978-01-24 Apollo Chemical Corporation Method of agglomerating particles in gas stream
US4307068A (en) * 1977-08-31 1981-12-22 Mitsubishi Jukogyo Kabushiki Kaisha Method and apparatus for treating an exhaust gas
US4533364A (en) * 1983-02-01 1985-08-06 Electric Power Research Institute, Inc. Method for flue gas conditioning with the decomposition products of ammonium sulfate or ammonium bisulfate
US4770674A (en) * 1984-08-06 1988-09-13 Foster Wheeler Energy Corporation Gas conditioning for an electrostatic precipitator
US5011516A (en) * 1989-11-06 1991-04-30 Electric Power Research Institute, Inc. Catalytic oxidation of SO2 to SO3 in the presence of fly ash
US5196038A (en) * 1990-03-15 1993-03-23 Wright Robert A Flue gas conditioning system
US5350441A (en) * 1990-03-15 1994-09-27 Wilhelm Environmental Technologies, Inc. Flue gas conditioning system
US5261931A (en) * 1990-03-15 1993-11-16 Wilhelm Environmental Technologies, Inc. Flue gas conditioning system
US5288309A (en) * 1992-04-07 1994-02-22 Wilhelm Environmental Technologies, Inc. Flue gas conditioning agent demand control apparatus
US5547495A (en) * 1992-04-07 1996-08-20 Wilhelm Environmental Technologies, Inc. Flue gas conditioning system
US5240470A (en) * 1992-04-07 1993-08-31 Wilhelm Environmental Technologies, Inc. In-duct flue gas conditioning system
US5356597A (en) * 1992-04-07 1994-10-18 Wilhelm Environmental Technologies, Inc. In-duct flue gas conditioning system
US5288303A (en) * 1992-04-07 1994-02-22 Wilhelm Environmental Technologies, Inc. Flue gas conditioning system
US5370720A (en) * 1993-07-23 1994-12-06 Welhelm Environmental Technologies, Inc. Flue gas conditioning system
US5665142A (en) * 1994-04-12 1997-09-09 Wilhelm Environmental Technologies, Inc. Flue gas conditioning system and method using native SO2 feedstock
US5538539A (en) * 1995-01-20 1996-07-23 Wahlco, Inc. Catalytic sulfur trioxide flue gas conditioning
EP0723804A1 (en) * 1995-01-20 1996-07-31 Wahlco, Inc. Catalytic sulfur trioxide flue gas conditioning
US5540755A (en) * 1995-01-20 1996-07-30 Wahlco, Inc Catalytic sulfur trioxide flue gas conditioning
DE19611332A1 (en) * 1996-03-22 1997-09-25 Abb Research Ltd Process for conditioning waste gas
US5980610A (en) * 1997-09-25 1999-11-09 The United States Of America As Represented By The United States Department Of Energy Apparatus and method for improving electrostatic precipitator performance by plasma reactor conversion of SO2 to SO3
US6749670B2 (en) * 2001-03-26 2004-06-15 Shell Oil Company Process for trapping particulate matter in hot gas and trap therefor
US20120058035A1 (en) * 2010-09-06 2012-03-08 Krigmont Henry V System and Method for Flue Gas Conditioning
US8449653B2 (en) * 2010-09-06 2013-05-28 Henry Krigmont System and method for flue gas conditioning
US20120067213A1 (en) * 2010-09-21 2012-03-22 General Electric Company Method and apparatus for air pollution control
US8398744B2 (en) * 2010-09-21 2013-03-19 General Electric Company Method and apparatus for air pollution control

Similar Documents

Publication Publication Date Title
US3581463A (en) Electrostatic gas cleaning
US4956162A (en) Process for removal of particulates and SO2 from combustion gases
TW403823B (en) Alkaline sorbent injection for mercury control
JP3527156B2 (en) Removal of mercury in public facility wet scrubbers using chelating agents
US5035188A (en) Liquid blowdown elimination system
US3656440A (en) Incinerator having means for treating combustion gases
US5965095A (en) Flue gas humidification and alkaline sorbent injection for improving vapor phase selenium removal efficiency across wet flue gas desulfurization systems
KR830005910A (en) Air scrubbing method for the recovery of fine carbide particles from the waste from the iron oxide reduction furnace
US3315444A (en) Integrated mechanical filter and electrostatic precipitator system for broad spectrum purification
US4640825A (en) Process for simultaneous removal of SO2 and NOx from gas streams
US2746563A (en) Purification of gases
US5820831A (en) Method and apparatus for preparing calcium carbonate for scrubbing sulfur oxides from combustion effluents
US5817283A (en) Method for removing sulfur dioxide and nitrogen oxides from combustion gases
GB799625A (en) Improvements in or relating to apparatus for separating suspended particulate matterfrom gas streams
JPH0693974B2 (en) Combustion exhaust gas treatment method
AU594471B2 (en) Process for removal of particulates and SO2 from combustion gasses
GB1341490A (en) Electrostatic extraction apparatus
US3687630A (en) Gas cleaning process
JPS5855302Y2 (en) Coal ash processing equipment
Pilat et al. Pilot scale SO2 control by dry sodium bicarbonate injection and an electrostatic precipitator
JP2000117054A (en) Removing method of dioxins in waste gas
EP0836878A1 (en) Method for removing sulfur dioxide and nitrogen oxides from combustion gases
Hesketh Equipment Sizing Data
Pausch et al. Method for removing pollutants from a gaseous mixture
JPH0628748B2 (en) Exhaust gas purification device