US3411864A - Method of removing suspended acidic or alkaline pulverulent particles from gases - Google Patents

Method of removing suspended acidic or alkaline pulverulent particles from gases Download PDF

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Publication number
US3411864A
US3411864A US381320A US38132064A US3411864A US 3411864 A US3411864 A US 3411864A US 381320 A US381320 A US 381320A US 38132064 A US38132064 A US 38132064A US 3411864 A US3411864 A US 3411864A
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neutralizing agent
gas
acidic
washing liquid
gases
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US381320A
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English (en)
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Pallinger Josef
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Waagner Biro AG
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Waagner Biro AG
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/09—Furnace gas scrubbers

Definitions

  • the present invention is concerned with a method of washing a gaseous suspension containing acidic impurities, comprising the steps of introducing into the gaseous suspension an alkaline pulverulent neutralizing agent for the acidic impurities, and contacting the thus formed neutralizing agent-containing suspension with an aqueous washing liquid so as to form a purified gas and a spent washing liquid containing the impurities and being substantially neutral due to the introduction of the neutralizing agent.
  • the present invention contemplates a method of washing a gaseous suspension containing acidic impurities, comprising the steps of introducing into the gaseous suspension calcium carbonate as a salt 3,411,864 Patented Nov. 19, 1968 adapted at an elevated temperature to be split into a basic oxide and a volatile acid residue, the basic oxide being adapted to neutralize the acidic impurities, subjecting the thus formed mixture to the elevated temperature so as to form the volatile acid and the basic oxide adapted to act as a neutralizing agent for the acidic impurities, and contacting the thus formed neutralizing agent-containing suspension with an aqueous washing liquid so as to form a purified gas and a spent washing liquid containing the impurities and being substantially neutral due to the introduction of the neutralizing agent.
  • the present invention also includes a gas purification device comprising, in combination, conduit means having inlet and outlet ends for passing therethrough a gaseous suspension of solid particles including constituents which with a washing liquid will give a reaction other than neutral, introduction means communicating with the conduit means at a point spaced from the inlet and outlet ends thereof for introducing into the same a pulverulent neutralizing agent for the gaseous suspension, gas washing means operatively connected to the outlet end of the conduit means for washing the neutralizing agentcontaining suspension with a Washing liquid to form a washed gas and a substantially neutral spent washing liquid, and separating means for separating the thus washed gas from the spent washing liquid.
  • the present invention includes in a gas purification device, in combination, reactor means for forming a combustible gaseous suspension of solid particles including constituents which with a washing liquid will give a reaction other than neutral, combustion means for burning the combustible gaseous suspension and including injector means for injecting into the combustible suspension a pulverulent neutralizing agent suspended in combustion air so as to form in the combustion means a burnt gas having solid particles suspended therein, washing means for washing the suspension of solid particles in burnt gas with a washing liquid forming a washed gas and a spent washing liquid which is substantially neutral due to the injection of the neutralizing agent, conduit means for passing gaseous suspension from the reactor means to the combustion means and from the combustion means to the washing means, and separating means for separating washed gas and spent washing liquid from each other.
  • a pulverulent neutralizing agent for instance, a salt or an oxide is introduced into the gases which are released from the reactor, for instance, from a metallurgical furnace, and the thus formed mixture is then contacted with the washing liquid.
  • the washing liquid will thus contact a gas which contains, for instance, acidic components either in gaseous form or in the form of suspended solids, and which also contains pulverulent neutralizing agent. Either during the washing, or at least partly prior thereto, a reaction will take place between the acidic constituents and the neutralizing agent so as to neutralize the acidic constituents and thus the wash water will remain neutral and will not be acidified by the presence of acidic constituents in the gas or gaseous suspension of solids which is to be washed.
  • a gas which contains, for instance, acidic components either in gaseous form or in the form of suspended solids, and which also contains pulverulent neutralizing agent.
  • the gas or suspension will contain acidic constituents and the neutralizing agent will be a salt or oxide of alkaline reaction, however, it is of course also possible to utilize the present invention for neutralizing alkaline gases or suspensions with an acidic neutralizing agent.
  • While the present invention also could be applied to a gas of acidic or alkaline reaction which does not carry any suspended solids, it is primarily contemplated to be employed in connection with the removal of dust or suspended solids from gases which emanate from a variety of reaction devices, such as metallurgical furnaces, converters, or combustion devices.
  • a converter 1 is shown from the opening 2 of which gases will be discharged upon refining of steel in the converter 1. These gases are caught or received by hood 3 while simultaneously air will flow into hood 3 through the annular opening 4 between converter 1 and hood 3.
  • Opening 5 can be closed by means of gate valve 7 and immediately behind gate valve 7 are nozzles 8 for blowing secondary air into the boiler.
  • This secondary air serves for igniting the combustible gas which is introduced through hood 3 and for thorough mixing of the converter gases with the additional air introduced through opening 4. Turbulence is created and serves for an intimate mixing of the gases, combustion of which will be practically completed when the gases leave boiler 6 at its upper end portion.
  • the gases which contain suspended solids, flow then through conduits 9 and 10 whereby, as illustrated, a super-heater 11 and a preheater 12 are arranged in conduit 10.
  • a super-heater 11 and a preheater 12 are arranged in conduit 10.
  • the gases After the gases have passed in contact with preheater 12, they are introduced into the washer 13 in which, through nozzles 14, a washing liquid is passed in contact with the gases.
  • the waste gases which have been purified by contact with the washing liquid, generally water, and from which solid suspended particles have been removed, pass then through flue 15 into a smoke stack (not shown).
  • the air which is blown into the boiler through nozzles 8 is ambient air which is introduced through conduit 16 into blower 17.
  • the air is compressed in blower 17 and flows through a nozzle 18, for instance, into an ejector device 19 wherein a suction effect is created which will serve to carry along pulverulent materials, for instance, pulverulent neutralizing agents for acidic converter gases, such as calcium oxide, calcium carbonate or the like which have been ground to greater or lesser degree of fineness.
  • This pulverulent neutralizing agent for instance, calcium carbonate, is stored in hopper 20 and reaches ejector 19 through a dosing device 21 so that controlled quantities of the pulverulent neutralizing agent are sucked into the ejector and will then flow together with secondary air through conduit 22 to nozzles 8.
  • washing device 13 the neutralizing agent as well as the converter dust will be washed out of the waste gases before the waste gases are released through flue 15-.
  • the spent washing liquid leaves Washer 13 at its outlet 23 and is passed by way of pump 24 into clarifier 25 in which sludge is separated from the liquid.
  • the clear liquid flows then to storage tank 26 and is then recycled by means of pump 28 through conduit 27 to the nozzles 14 of Washer 13.
  • the desired water level is maintained in storage tank 26 by introducing into the same in conventional manner the amount of fresh water required for this purpose.
  • the heavy sludge is discharged from converter 25.
  • the neutralizing agent such as calcium carbonate or calcium oxide
  • the lime dust or the like is injected into a zone where the waste gases are of very high temperature, either initially or due to combustion of the same, and quite obviously, the neutralization reaction will be facilitated by reduction of the particle size of the neutralizing agent.
  • the gases in the hot zone wherein the neutralizing agent is introduced are sufliciently hot, then coarser lime dust, for instance, wil be split up by exposure to such high temperature and thus a desired small particle size will be obtained even though the initially introduced lime dust may have been of coarser grain size.
  • the invention is not limited to the illustrated device and the manner of operation of the same which has been described by way of example.
  • the neutralizing agent such as calcium carbonate
  • the desired oxide and a volatile gaseous residue will be formed, for instance, calcium oxide as the basic oxide and carbon dioxide as the volatile acidic residue in the case of introducing calcium carbonate.
  • the salt or oxide is then carried along by the gases flowing from the reactor, such as converter 1, due to the high speed of flow of such gases.
  • the present process and device has considerable advantages over prior art arrangements according to which in the case of acidic waste gases alkaline substances, such as calcium carbonate are added to the feed water of the washing device, for instance, to neutralize S0 or S0 in order to keep the wash water at a pH approximating 7.
  • alkaline substances such as calcium carbonate
  • Neutralization may take place in the gas flow, i.e. prior to contact with the washing liquid, as well as in the scrubber upon contact with the washing liquid (generally water).
  • Neutralization of the wash water could be achieved in the above described manner, for instance, in connection with the purification of converter gas carrying converter dust which contained 1.7% CaO, 0.3% MgO, 3.4% S03 and FB2(SO4)3H2SO4'2H20.
  • the present invention proposes introduction of the neutralizing agent in solid pulverulent form anywhere between the reaction vessel in which the gases which are to be cleaned are formed (or even in the reaction vessel) and the washing device.
  • the optimum point of introduction of the pulverulent neutralizing agent will depend on temperature and flow conditions, as well as on the chemical compositions of the gas, the dust carried by the same and the neutralizing agent.
  • the addition of neutralizing agent should be controlled in such a manner that the waste wash Water will be substantially neutral without burdening the recycling wash water with excessive amounts of neutralizing agent. Thus, it should be possible to temporarily interrupt the addition of neutralizing agent when the concentration of the same in the recycling wash water exceeds a desired value.
  • pH meter 31 may be located in the conduit leading from washing device 13 to pump 24 and may serve to actuate dosing device 32.
  • the neutralizing agent is introduced into the gas near its point of origin and relatively distant from the washer, as has been illustrated in the drawing, and when, consequently, the neutralizing agent is introduced into hot gas, a neutralizing reaction will take place between the neutralizing agent and the hot gas and/or the dust carried by the same already long before the gas reaches washer 13.
  • the introduction of the neutralizing agent may also be carried out jointly with the introduction of a fuel into burner 6 or jointly with the introduction of primary combustion air into the same.
  • coarser dust or coarser particles is used herein to denote particles of a size of 200 microns or larger, while particles of a size smaller than 200 microns are referred to as very finely subdivided dust.
  • the pulverulent neutralizing agent for instance calcium carbonate
  • the particles of the neutralizing agent will be broken up into smaller particles and thus will act more efiectively due to the larger surface area relative to the volume of the individual smaller particles.
  • the pulverulent neutralizing agent is to be introduced into gas having a temperature of less than 1000" C.
  • a conventional gas washing device 220 cubic meters per hour of water were used for purifying waste gases.
  • the waste gases carried 100 kg. of sulfur per hour, the latter being chemically bound in various manners, for instance as S0
  • the wet washing device removed about 80 90% of the sulfur content of the waste gas and thus, theoretically, should have required about 300 kg. of calcium carbonate per hour for neutralizing the wash water.
  • the pH of the washing liquid leaving the device was between 2 and 3.
  • calcium carbonate particles having a particle size greater than 200 microns were blown into acidic gas having a temperature of about 1300 C.
  • coarse particles having a particle size of 200 microns or more will disintegrate into smaller particles due to heat stresses when such coarse particles are introduced into a relatively hot stream of gas, having a temperature of 1000 C. or more.
  • a relatively hot stream of gas having a temperature of 1000 C. or more.
  • the lime was subdivided into particles of the magnitude of 200 microns. This effect, i.e. the comminution of coarser particles by exposing the same to high temperatures will, with respect to acidic as well as alkaline neutralizing agents, eliminate the necessity for employing mechanical comminution devices.
  • a washing liquid and which with said washing liquid will give a reaction other then neutral comprising the steps of introducing into said gas a pulverulent neutralizing agent for said impurities which is at least partially soluble in said washing liquid; contacting the thus formed neutralizing agent-containing mixture with a washing liquid so as to wash out said impurities and said neutralizing agent and at least partially dissolve the same, thereby purifying said gas and forming a substantially neutral spent washing liquid; and separating the thus purified gas from said spent substantially neutral washing liquid.
  • a method of washing a gaseous suspension of finely subdivided non-fluid, acidic impurities comprising the steps of introducing into said gaseous suspension an alkaline pulverulent neutralizing agent for said acidic impurities; and contacting the thus formed neutralizing agentcontaining suspension with an aqueous washing liquid in which said acidic impurities and said neutralizing agent are at least partially soluble so as to form a purified gas and a spent washing liquid containing said impurities and being substantially neutral due to said introduction of said neutralizing agent.
  • a method of washing a gaseous suspension of finely subdivided, non-fluid, acidic impurities comprising the steps of introducing into said gaseous suspenson a salt adapted at an elevated temperature to be split into a basic oxide and a volatile acid residue, said basic oxide being adapted to neutralize said acidic impurities; subjecting the thus formed mixture to said elevated temperature so as to form said volatile acid and said basic oxide adapted to act as a neutralizing agent for said acidic impurities; and contacting the thus formed neutralizing agent-containing suspension With an aqueous washing liquid in which said acidic impurities and said basic oxide are at least partially soluble so as to form a purified gas and a spent washing liquid containing said impurities and being substantially neutral due to said introduction of said neutralizing agent.
  • a method of washing a combustible gaseous suspension including finely subdivided, non-fiuid, acidic impurities comprising the steps of introducing into said gaseous suspension a suspension in air of an alkaline neutralizing agent for said acidic impurities; subjecting the thus formed mixture to combustion so as to form a neutralizing agent-containing gaseous suspension of solid particles; and contacting the thus formed neutralizing agent-containing suspension with an aqueous washing liquid in which the non-fluid constituents of said suspension are at least partially soluble so as to form a purified gas and a spent washing liquid containing said impurities and being substantially neutral due to said introduction of said neutralizing agent.
  • a method of washing a gaseous suspension including finely subdivided, non-fluid, acidic impurities comprising the steps of introducing into said gaseous suspension a relatively coarse pulverulent alkaline neutralizing agent for said acidic impurities adapted to split at an elevated temperature into particles of smaller size; subjecting the thus formed mixture to said elevated temperature so as to reduce the particle size of said neutralizing agent; and contacting the thus formed neutralizing agent-containing suspension with an aqueous washing liquid in which the non-fluid constituents of said suspension are at least partially soluble so as to form a purified gas and a spent washing liquid containing said impurities and being substantially neutral due to said introduction of said neutralizing agent.
  • a method of washing a gaseous suspension including finely subdivided, non-fluid, acidic impurities comprising the steps of introducing into said gaseous suspension pulverulent calcium oxide as a neutralizing agent for said acidic impurities; and contacting the thus formed neutralizing agent-containing suspension with an aqueous washing liquid in which said acidic impurities and said calcium oxide are at least partially soluble, so as to form a purified gas and a spent washing liquid containing said impurities and being substantially neutral due to said introduction of said neutralizing agent.
  • a method of washing a gaseous suspension including finely subdivided, non-fluid, acidic impurities comprising the steps of introducing into said gaseous suspension at a relatively low elevated temperature a finely subdivided pulverulent neutralizing agent for said acidic impurities; and contacting the thus formed neutralizing agent-containing suspension with an aqueous washing liquid in which said acidic impurities and said neutralizing agent are at least partially soluble, so as to form a purified gas and a spent washing liquid containing said impurities and being substantially neutral due to said introduction of said neutralizing agent.
  • a method of washing a gaseous suspension including finely subdivided, non-fluid, acidic impurities which suspension is formed in a reaction vessel comprising the steps of introducing into said reaction vessel an alkaline pulverulent neutralizing agent for said acidic impurities so as to form a neutralizing agent-containing gaseous suspension; withdrawing the thus formed neutralizing agent-containing suspension from said reaction vessel; and contacting said withdrawn suspension wit-h an aqueous washing liquid in which said acidic impurities and said neutralizing agent are at least partially soluble, so as to form a purified gas and a spent washing liquid containing said impurities and being substantially neutral due to said introduction of said neutralizing agent.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
US381320A 1963-07-10 1964-07-09 Method of removing suspended acidic or alkaline pulverulent particles from gases Expired - Lifetime US3411864A (en)

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AT553863A AT255380B (de) 1963-07-10 1963-07-10 Verfahren zur Neutralisation von Waschflüssigkeiten

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3520649A (en) * 1967-09-28 1970-07-14 James P Tomany System for removal of so2 and fly ash from power plant flue gases
JPS4949471A (de) * 1972-05-10 1974-05-14
US3837820A (en) * 1971-09-01 1974-09-24 Apollo Chem Combustion control by additives introduced in both hot and cold zones
US3905774A (en) * 1972-06-02 1975-09-16 Steuler Industriewerke Gmbh Apparatus for the removal of malodorous components from gases
US3951646A (en) * 1973-12-25 1976-04-20 Dowa Mining Co., Ltd. Process to make brittle boiler dust adhering to the water tube surface of a waste heat boiler of non-ferrous metal smelting furnace
US3966878A (en) * 1973-11-08 1976-06-29 General Resource Corporation Method for removing pollutants from a gaseous mixture
US3980756A (en) * 1974-01-28 1976-09-14 Combustion Engineering, Inc. Air pollution control system
US4135914A (en) * 1976-02-07 1979-01-23 Korf Engineering Gmbh Process for the direct reduction of metallic oxides
US4542000A (en) * 1984-01-30 1985-09-17 Efb, Inc. Method for treating gas streams
US4603037A (en) * 1985-03-22 1986-07-29 Conoco Inc. Desulfurization of flue gas from multiple boilers
US4645652A (en) * 1985-11-29 1987-02-24 General Electric Company Method for scrubbing sulfur oxides and nitrogen oxides in a flue gas duct
US4645653A (en) * 1985-11-29 1987-02-24 General Electric Company Method for dry flue gas desulfurization incorporating nitrogen oxides removal
US4668489A (en) * 1984-01-30 1987-05-26 Efb Inc. Method for treating gas streams
US4753785A (en) * 1982-09-24 1988-06-28 Deutsche Babcock Anlagen Aktiengesellschaft Method of purging of waste gases
US4788047A (en) * 1985-04-24 1988-11-29 Oy Tampella Ab Process for causing the gaseous sulfur compounds of flue gases to react to form solid compounds which can be separated from the flue gases
US5002743A (en) * 1988-10-31 1991-03-26 Oy Tampella Ab Process for the removal of sulfur dioxide from hot flue gases
US6290921B1 (en) * 1999-11-03 2001-09-18 Foster Wheeler Enegeria Oy Method and apparatus for binding pollutants in flue gas
CN104792189A (zh) * 2015-04-27 2015-07-22 凉山矿业股份有限公司 一种控制铜冶炼余热锅炉烟道过渡段结渣的方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT386269B (de) * 1983-03-03 1988-07-25 Waagner Biro Ag Verfahren zur schadstoffabsorption aus rauchgasen aus verbrennungsanlagen und einrichtung zur durchfuehrung des verfahrens
DE3307848A1 (de) * 1983-03-05 1984-09-06 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zur nachverbrennung und reinigung von prozessabgasen
GB2163968A (en) * 1984-09-06 1986-03-12 Mitsubishi Heavy Ind Ltd Method for the treatment of exhaust gases

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US1221505A (en) * 1914-07-23 1917-04-03 Research Corp Method of separating certain constituents from a gas or mixture of gases.
GB435560A (en) * 1934-03-23 1935-09-23 Lodge Cottrell Ltd Improvements in or relating to the treatment of waste industrial gases
US2718453A (en) * 1951-01-03 1955-09-20 John W Beckman Method for reducing sulfur compounds from flue gases
US2877086A (en) * 1957-02-08 1959-03-10 Pittsburgh Coke & Chemical Co Process of removing entrained alkali metal cyanides from ferro-manganese furnace gases
US2919174A (en) * 1956-09-12 1959-12-29 Wheelabrator Corp Method for removal of halides from gases
US3310365A (en) * 1962-10-30 1967-03-21 Southern California Edison Co Flue gas process

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US1221505A (en) * 1914-07-23 1917-04-03 Research Corp Method of separating certain constituents from a gas or mixture of gases.
GB435560A (en) * 1934-03-23 1935-09-23 Lodge Cottrell Ltd Improvements in or relating to the treatment of waste industrial gases
US2718453A (en) * 1951-01-03 1955-09-20 John W Beckman Method for reducing sulfur compounds from flue gases
US2919174A (en) * 1956-09-12 1959-12-29 Wheelabrator Corp Method for removal of halides from gases
US2877086A (en) * 1957-02-08 1959-03-10 Pittsburgh Coke & Chemical Co Process of removing entrained alkali metal cyanides from ferro-manganese furnace gases
US3310365A (en) * 1962-10-30 1967-03-21 Southern California Edison Co Flue gas process

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3520649A (en) * 1967-09-28 1970-07-14 James P Tomany System for removal of so2 and fly ash from power plant flue gases
US3837820A (en) * 1971-09-01 1974-09-24 Apollo Chem Combustion control by additives introduced in both hot and cold zones
JPS4949471A (de) * 1972-05-10 1974-05-14
US3988421A (en) * 1972-05-10 1976-10-26 Tecnochim S.R.L. Gas cleaning process and equipment
US3905774A (en) * 1972-06-02 1975-09-16 Steuler Industriewerke Gmbh Apparatus for the removal of malodorous components from gases
US3966878A (en) * 1973-11-08 1976-06-29 General Resource Corporation Method for removing pollutants from a gaseous mixture
US3951646A (en) * 1973-12-25 1976-04-20 Dowa Mining Co., Ltd. Process to make brittle boiler dust adhering to the water tube surface of a waste heat boiler of non-ferrous metal smelting furnace
US3980756A (en) * 1974-01-28 1976-09-14 Combustion Engineering, Inc. Air pollution control system
US4135914A (en) * 1976-02-07 1979-01-23 Korf Engineering Gmbh Process for the direct reduction of metallic oxides
US4753785A (en) * 1982-09-24 1988-06-28 Deutsche Babcock Anlagen Aktiengesellschaft Method of purging of waste gases
US4542000A (en) * 1984-01-30 1985-09-17 Efb, Inc. Method for treating gas streams
US4668489A (en) * 1984-01-30 1987-05-26 Efb Inc. Method for treating gas streams
US4603037A (en) * 1985-03-22 1986-07-29 Conoco Inc. Desulfurization of flue gas from multiple boilers
US4788047A (en) * 1985-04-24 1988-11-29 Oy Tampella Ab Process for causing the gaseous sulfur compounds of flue gases to react to form solid compounds which can be separated from the flue gases
US4645652A (en) * 1985-11-29 1987-02-24 General Electric Company Method for scrubbing sulfur oxides and nitrogen oxides in a flue gas duct
US4645653A (en) * 1985-11-29 1987-02-24 General Electric Company Method for dry flue gas desulfurization incorporating nitrogen oxides removal
US5002743A (en) * 1988-10-31 1991-03-26 Oy Tampella Ab Process for the removal of sulfur dioxide from hot flue gases
US6290921B1 (en) * 1999-11-03 2001-09-18 Foster Wheeler Enegeria Oy Method and apparatus for binding pollutants in flue gas
CN104792189A (zh) * 2015-04-27 2015-07-22 凉山矿业股份有限公司 一种控制铜冶炼余热锅炉烟道过渡段结渣的方法

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AT255380B (de) 1967-07-10
GB1076016A (en) 1967-07-19

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