Abstract: A treatment system to efficiently remove lead from dust contained in extracted cement kiln combustion gas while reducing facility and running costs. A treatment system 1 comprising: a probe 3 for extracting a part of combustion gas, while cooling it, from a kiln exhaust gas passage, which runs from an inlet end of a cement kiln to a bottom cyclone; a classifier 5 for separating coarse powder from dust contained in the combustion gas extracted by the probe 3; a wet dust collector 6 for collecting dust from the extracted gas containing fine powder discharged from the classifier 5; and devices 12, 13 for feeding sulfurizing agent for sulfurizing lead contained in the kiln exhaust gas to the wet dust collector 6, and others. From the sulfurizing-agent feeders 12, 13 are preferably added the sulfurizing agents to a circulation liquid tank 7 or a pump 9 for circulating slurry.

Abstract: Method and apparatus for removing sulfur from a hydrocarbon fuel. The apparatus includes a combustion reactor (3) and a sulfur trap (4) and the combustion reactor (3) is adapted to operate with an air-to-fuel ratio below 1 and in the presence of steam. The sulfur trap (4) is located downstream the combustion reactor (3) and is adapted to remove sulfur compounds formed in the combustion reactor (3).

Abstract: A method of removing SO3 from a flue gas of a boiler. The method includes the following steps: injecting chloride salts into a stream of the flue gas at a position located downstream of an air pre-heater—the position is selected so that the flue gas has a temperature at the position of substantially between 100° C. and 400° C.; reacting chloride salts with the SO3 to form a sulfate-containing reaction product; and collecting the sulfate-containing reaction product in a particulate collector downstream of the boiler. A purge stream from a wet flue gas desulfurization system may be used as a source of the chloride salts. Additional chlorides may be added to the purge stream as necessary.

Abstract: Disclosed is a process for removing sulfur from a fuel gas stream that comprises an organic sulfur compound and a light olefin. The process includes introducing a fuel gas stream into an elongated hydrotreating reactor vessel in which it is contacted with a hydrodesulfurization catalyst under hydrodesulfurization process conditions. A quench gas stream is also introduced into the elongated hydrotreating reactor vessel at a location below the point of introduction of the fuel gas stream. A reactor effluent is yielded that contains hydrogen sulfide and a significantly reduced organic sulfur concentration that is below the organic sulfur concentration of the fuel gas stream.

Abstract: A process for removal of SO2 in off-gases having a temperature of 30-150° C. and containing 0.001-1 vol % SO2 in which the SO2 is oxidised to H2 SO4 by spraying an aqueous solution of H2O2 into the off-gas upstream of an aerosol filter removing the produced sulphuric acid from the off-gas.

Abstract: Calcium bromide is a component of sorbent compositions that can be added on to coal to reduce the amount of sulfur gases released into the atmosphere from a coal burning facility. The sorbent components are added onto coal before the coal is added into the furnace and combusted. The fuel being burned is any fuel that contains sulfur, such as lignite, bituminous, and anthracite coal. The sorbent can contain other components such as silica, alumina, cement kiln dust, lime kiln dust, Portland cement, and aluminosilicate clay. Sulfur emissions are monitored during combustion of the fuel, and the rate of sorbent addition can be changed or a adjusted based on the monitored sulfur levels.

Abstract: In an apparatus for continuously recovering sulfur from a gas stream containing 0.1 to 3.0 vol-% H2S, further gaseous sulfur compounds and sulfur, the gas stream first is passed over a reduction stage consisting of hydrogenation catalyst and then over a selective oxidation stage consisting of oxidation catalyst. To reduce the amount of apparatus involved, it is provided to arrange the reduction stage and the selective oxidation stage in a reaction tank and to leave a space for introducing a gaseous cooling medium into the gas stream between the two stages.

Abstract: The invention relates to a process and a device for the removal of dust, HF, HCl, SO2, SO3, heavy metals, heavy-metal compounds, polyhalogenated hydrocarbons and polycyclic hydrocarbons from combustion flue gases by treating the pollutant-containing combustion flue gases with a sorbent in a circulating fluidized bed. The process is characterized in that the sorbent used is a mixture of Ca(OH)2, at least one naturally occurring zeolite and a carbon-containing substance, in that the treatment of the pollutant-containing combustion flue gases with the sorbent is carried out at from 120 to 180° C.

Abstract: A reactor cools humidifies gases produced by combustion or the like. The reactor has a chamber with an inlet at a lower end to receive a flow of gas, and an outlet at a upper end. The gas flows in a generally upward direction through the reactor. The horizontal cross-section of the chamber increases with height and the flow velocity of the gas decreases as it flows upwardly. The reactor includes at least one device for injecting water droplets into the upper region of the chamber, counter to the gas flow. As the water droplets fall, they gradually evaporate and lose mass and encounter a counterflow of increasingly higher velocity and temperature until the force of the upwardly flowing gas is sufficient to reverse their flow and carry them in an upward direction.

Abstract: A flue gas desulfurization process and system that utilize ammonia as a reactant, and in which any hydrogen sulfide and/or mercaptans within the ammonia are separated during the desulfurization process so as to prevent their release into the atmosphere. The process and system entail absorbing acidic gases from a flue gas with a scrubbing media containing ammonium sulfate to produce a stream of scrubbed flue gas, collecting the scrubbing media containing the absorbed acidic gases, injecting into the collected scrubbing media a source of ammonia that is laden with hydrogen sulfide and/or mercaptans so that the injected ammonia is absorbed into and reacted with the collected scrubbing media, stripping the hydrogen sulfide and/or mercaptans from the collected scrubbing media by causing the hydrogen sulfide and/or mercaptans to exit the collected scrubbing media as stripped gases, and collecting the stripped gases without allowing the stripped gases to enter the stream of scrubbed flue gas.

Abstract: A method for treating a stream comprising an emission gas includes passing portions of the stream comprising the emission gas to two or more reactor units arranged in parallel while subjecting fluid flowing through at least one of the reactor units to pressure control; identifying when at least one of the reactor units trips or is taken out of service; and when at least one of the reactor units trips or is taken out of service, adjusting a flow path of said portion of the stream originally passing to the out-of-service reactor unit such that said portion passes to an absorber for removing the emission gas via a compressor, and subjecting the fluid flowing through all of the in-service reactor units to flow rate control.

Abstract: A system and method for removing sulfur-containing contaminants from indoor air includes a panel system having a first layer and a second layer. The first layer can include a base media onto which sodium bicarbonate is attached. The second layer can include a base media onto which activated carbon is attached. Indoor air including sulfur-containing contaminants can contact and pass through the first layer. Sulfuric acid can react with the sodium bicarbonate to produce sodium sulfate, which can, in turn, act as a drying agent for organic sulfur-containing contaminants in the indoor air, such as carbon disulfide and carbonyl sulfide. As a result of such drying, the second layer can more effectively trap and/or bind (adsorb) the organic sulfur-containing contaminants so that these contaminants are removed from the contaminated air. The treated air can be returned to an indoor space of the structure.

Abstract: The invention relates to a mercury removing apparatus and a mercury removing method in which a mercury removing ratio is improved with low cost, the mercury removing apparatus removes mercury from exhaust gas generated by coal combustion, an acidic solution spraying nozzle for spraying sulfuric acid into exhaust gas is provided on the down stream side of an absorption tower for removing sulfur oxide from the exhaust gas.

Abstract: A COS treatment apparatus for a gasified gas includes an O2 removal catalyst and a COS conversion catalyst located on the downstream side of a gasified gas flow with respect to the O2 removal catalyst. Also, a COS treatment apparatus includes a TiO2 catalyst that carries Cr2O3 or NiO. Further, a COS treatment method includes a first step in which O2 is removed by the reaction with H2S and CO, and a second step in which COS is converted to H2S.

Abstract: A method for treating gases to be scrubbed, comprising filling a scrubber with a volume of lean liquid adequate to cover a sintered permeable membrane in the reaction chamber and a bit more to create a reaction zone in not only a plurality of pores in the membrane with gases but in a reaction zone above the membrane, then introducing gases to be scrubbed to the membrane, building up pressure in the reaction chamber, and passing scrubbed gas from the reaction zone to an exit port at a rate equal to the rate of gases to be scrubbed are introduced.

Abstract: Diverse methods of utilization and the corresponding, related modifications, of linear type, Variable Gas Atomization (VGA) nozzles and lances are described. Therein is joined the mixing and gas atomization of chemicals that react to form active products that further react with harmful flue gas constituents of combustion so as to enable their effective collection. One version combines, in a lance assembly of nozzles, the injection of reactants, in the form of finely divided dry solids conveyed in a carrier air stream, and the fine atomization of water, aqueous solutions or slurries. Atomization of such streams is employed to effectively wet the surfaces of the dry particles and, thereby, promote the rapid sorption of gaseous constituents of flue gas being treated. Another version simultaneously mixes and atomizes reacting chemicals to produce, and release into the flue gas stream, strongly oxidizing, transient, species of their reaction products.

Abstract: Contemplated configurations and methods for elemental sulfur removal from various gases, and especially well acid gases employ a hydrocarbon solvent that dissolves the sulfur to form a rich solvent and that is then regenerated by hydrotreating. Thus, sulfur is removed from the rich solvent as H2S that may then be processed (e.g., in Claus unit or absorption unit) while the regenerated solvent is routed back to the well and associated production pipes.

Abstract: An improved process for deacidizing a gaseous mixture using phase enhanced gas-liquid absorption is described. The process utilizes a multiphasic absorbent that absorbs an acid gas at increased rate and leads to reduced overall energy costs for the deacidizing operation.

Abstract: An additive and method of use for treating flue gas of a coke-fired cupola following removal of the blast air during shutdown to adjust the charge and reduce acid buildup in the condensate and corrosion in downstream equipment by injecting into the flue gas a finely divided spray comprising an additive containing a volatile amine mixed with an antistatic agent that creates a positive static charge in the additive, and elevates the pH of the condensate by reducing the formation of sulfuric acid from entrained sulfur-containing compounds.

Abstract: An apparatus configured for treating sulfur at an elevated pressure. Embodiments of the apparatus comprises a vessel into which the sulfur is injected and a device for alleviating the pressure of the sulfur.

Abstract: The invention provides a process for disposal of mercaptans, the process comprising the steps of: (a) contacting a feed gas stream comprising mercaptans with liquid sulphur in a sulphide producing zone at elevated pressure and at a temperature in the range of from 300 to 450° C. to obtain a liquid stream comprising sulphur and sulphide compounds; (b) optionally separating the liquid stream obtained in step (a) into a first liquid phase enriched in liquid sulphur and a second liquid phase enriched in sulphide compounds; (c) combusting at least part of the sulphide compounds at elevated temperature in the presence of an oxygen-containing gas in a sulphur dioxide generation zone using a sulphide burner to which burner oxygen-containing gas is supplied, whereby at least part of the sulphide compounds is converted to sulphur dioxide to obtain a gas stream comprising sulphur dioxide.

Abstract: The present invention relates to a process and a plant for producing sulfuric acid, in which a starting gas containing sulfur dioxide at least partly reacts with molecular oxygen in at least one contact with at least one contact stage to form sulfur trioxide, and in which the sulfur-trioxide-containing gas produced is introduced into an absorber and converted there to sulfuric acid. To achieve that only small gas volumes must be supplied to the first contact stage, based on the amount of sulfur dioxide used, with at least the same capacity of the plant and by using conventional catalysts, it is proposed in accordance with the invention to supply to the first contact stage a contact gas with a sulfur dioxide content of more than 16 vol-% and with a volumetric ratio of sulfur dioxide to oxygen of more than 2.67:1.

Abstract: An air pollutant control system comprises: a denitration apparatus that reduces nitrogen oxide in flue gas discharged from a coal combustion boiler, and that sprays hydrogen chloride into the gas to oxidize mercury, an air heater that recovers heat in gas, a dust collector that reduces dust in gas, a desulfurization apparatus that reduces sulfur oxide in gas from which the dust has been reduced, a hydrogen chloride vaporizer that evaporates concentrated hydrochloric acid to obtain the hydrogen chloride, and a hydrochloric acid neutralization tank where dilute hydrochloric acid discharged from the hydrogen chloride vaporizer or the concentrated hydrochloric acid is neutralized with an alkali agent. Neutralized chloride is supplied to a fuel feeder, mixed with a fuel, and then burned as a fuel in a boiler to produce hydrogen chloride in flue gas. Together with sprayed hydrogen chloride derived from the hydrogen chloride vaporizer, the mercury is reduced.

Abstract: An exhaust gas processing method using a device having an air preheater for preheating air for combustion in a combustion device by using an exhaust gas emitted from the combustion device; a gas-gas heater (GGH) heat recovery device composed of a heat transfer tube for recovering the heat of the exhaust gas to a heat medium; a dust collector; a wet-type desulfurization device; a gas-gas heater (GGH) re-heater composed of a heat transfer tube for heating the exhaust gas at its outlet by using the heat medium supplied from the gas-gas heater heat recovery device, which are installed in that order from the upstream to the downstream of an exhaust gas duct of the combustion device.

Abstract: The following devices are successively disposed in the following order from an upstream side to a downstream side in an exhaust gas duct of a combustion apparatus: an air preheater, preheating combustion air for use in an exhaust gas treating apparatus; a heat recovery unit, recovering exhaust gas heat at an exit of the air preheater; a precipitator, collecting soot/dust contained in an exhaust gas at an exit of the heat recovery unit; a wet flue gas desulfurizer, removing sulfur oxides contained in the exhaust gas at the exit of the precipitator; and a reheater, heating the exhaust gas at the exit of the wet flue gas desulfurizer. Each of the heat recovery unit and the reheater has a heat exchanger tube, and a circulation line is disposed to connect the heat exchanger tubes. A sulfur trioxide (SO3) removing agent is supplied to the upstream side of the heat recovery unit, and the temperature of the exhaust gas at the exit of the heat recovery unit is adjusted to not more than a dew point of sulfur trioxide.

Abstract: A method of scrubbing mercury compounds and nitrogen oxides from a gas stream employing a scrubbing operation. The method involves the contact of the stream which contains mercury, SOx and NOx compounds with a sorbent to remove at least a portion of the latter compounds. This results in a partially cleaned stream. The method further involves contacting the latter stream with an oxidant to oxidize and remove substantially all residual nitrogen oxides, mercury and mercury compounds remaining in the stream.

Abstract: Diverse methods of utilization and the corresponding, related modifications, of linear type, Variable Gas Atomization (VGA) nozzles and lances are described. Therein is joined the mixing and gas atomization of chemicals that react to form active products that further react with harmful flue gas constituents of combustion so as to enable their effective collection. One version combines, in a lance assembly of nozzles, the injection of reactants, in the form of finely divided dry solids conveyed in a carrier air stream, and the fine atomization of water, aqueous solutions or slurries. Atomization of such streams is employed to effectively wet the surfaces of the dry particles and, thereby, promote the rapid sorption of gaseous constituents of flue gas being treated. Another version simultaneously mixes and atomizes reacting chemicals to produce, and release into the flue gas stream, strongly oxidizing, transient, species of their reaction products.

Abstract: Processes and compositions are provided for decreasing emissions of mercury upon combustion of fuels such as coal. Various sorbent compositions are provided that contain components that reduce the level of mercury and/or sulfur emitted into the atmosphere upon burning of coal. In various embodiments, the sorbent compositions are added directly to the fuel before combustion; are added partially to the fuel before combustion and partially into the flue gas post combustion zone; or are added completely into the flue gas post combustion zone. In preferred embodiments, the sorbent compositions comprise a source of halogen and preferably a source of calcium. Among the halogens, iodine and bromine are preferred. In various embodiments, inorganic bromides make up a part of the sorbent compositions.

Abstract: A process for the removal of sour gas from pressurized natural gas which is polluted by sulphur compounds and other sour gas compounds includes initially feeding natural gas into a sour gas absorption unit, in which the sulphur components and any other components are absorbed by a physically acting solution yielding a sour gas rich absorbent. The absorbant is heated and fed into a high-pressure flash unit, in which the desorbed sour-gas is separated yielding a sour gas poor absorbent. The desorbed sour gas is cooled and the vaporized absorbent is condensed out of the sour gas stream. The sour-gas poor absorbent from the high-pressure flash unit is freed from residual sour gas in a gas stripping unit by stripping gas. The absorbent obtained in the sour gas unit is cooled and recycled permitting the desorbed sour gas to be condensed by cooling water or cooling air.

Abstract: A sulfur species-containing feed gas is processed in a treatment plant in which COS is hydrolyzed, and in which so produced hydrogen sulfide and other sulfur species are absorbed in a lean hydrocarbon liquid. The sulfur species in the so formed rich hydrocarbon liquid are then subjected to catalytic conversion into disulfides, which are subsequently removed from the rich solvent. Most preferably, sulfur free lean solvent is regenerated in a distillation column and/or refinery unit, and light components are recycled from the rich hydrocarbon liquid to the absorber.

Abstract: The Low Temperature Mercury Control, or LTMC, process is a technology developed by us for controlling mercury emissions from coal-fired power plants. In the LTMC process, mercury emissions are controlled by cooling the exhaust flue gases with an air heater (or water spray) beyond the typical 300° F. to about 200-220° F., thereby promoting mercury absorption on the coal fly ash. The fly ash containing the absorbed mercury is then captured in the power plant's existing particulate collection device. An alkaline material, magnesium hydroxide slurry in our tests, is injected to eliminate sulfur trioxide (sulfuric acid) which could otherwise condense at the cool temperature and corrode or foul the power plant's air heater and ductwork.

Abstract: The invention relates to a process for cleaning exhaust gases produced by a sintering process of metal-containing waste. The sintering exhaust gas includes one or more harmful substances which are eliminated in at least two steps by at least one adsorption and/or absorption agent in a single moving bed in a moving bed reactor system. The moving bed includes a particle layer (stage I) disposed above a flow input area and below an adsorption layer (stage II) of the moving bed. One or more harmful substances in the sintering exhaust gas are absorptively or adsorptively bound to potassium and/or sodium compounds and the harmful substances are trapped by adhesion in the flow input area or the Particle layer (stage I) of the moving bed. The substantial removal of NOx and the adsorptive or absorptive removal of dioxins and furans takes place in the adsorption layer (stage II) in the moving bed.

Abstract: A scrubber for scrubbing at least one pollutant from flue gas includes a first stage configured to provide a chemical oxidant to a stream of flue gas, and a second stage configured to provide a chemical or chemicals to the stream of flue gas, a scrubbing medium recirculation feature configured to continuously recirculate a slurry used in the second stage, and a by-product processing portion configured to remove a by-product from a stream of slurry withdrawn from the scrubber. The by-product includes reaction products of at least one pollutant.

Abstract: Disclosed is a process for the removal of sulfur from a gas stream containing sulfur dioxide, hydrogen cyanide and hydrogen sulfide. The process includes a hydrogenation step, a hydrolysis step, an ammonia removal step and a hydrogen sulfide removal step. An aqueous alkaline washing liquid is used in the hydrogen sulfide removal step and with the spent sulfide containing washing liquid being regenerated using an oxidation bioreactor that utilizes sulfide oxidizing bacteria such as autotropic aerobic cultures of Thiobacillus and Thiomicrospira.

Abstract: A desorption process and a process for producing a catalytically deactivated formed zeolitic adsorbent, whereby both processes are suitable to improve the lifetime of a formed zeolitic adsorbent in the removal of sulfur compounds from sulfur contaminated gas and liquid feed streams. The adsorbent is in particular a synthetic 13X or LSX faujasite with a silica to alumina ratio from 1.9:1.0 to about 3.0:1.0. The cations of the faujasite include alkali and alkaline earth metals. The formed zeolite mixture is preferably catalytically deactivated due to a phosphate treatment. The desorption is carried out thermally, wherein the heat treatment is done at different temperature stages to avoid decomposition of the organic sulfur compounds.

Abstract: This invention relates to the use of a copper oxide adsorbent to remove mercury from a feed stream. When the feed stream is low in sulfur content, a sulfidation agent such as hydrogen sulfide should be added to the feed stream.

Abstract: A controller directs a process primarily performed to control emission of a particular pollutant into the air. The process has multiple process parameters (MPPs), including a parameter representing an amount of the particular pollutant. The controller includes either a neural network process model or a non-neural network process model. In either case, the model represents a relationship between a first of the MPPs and one or more of the other MPPs. The one or more other MPPs include a second of the MPPs which is other than the parameter representing the amount of the emitted particular pollutant. Also included is a processor configured with logic to estimate a value of the second MPP, and to direct control of the first MPP based on the estimated value of the second MPP and the model.

Abstract: A method operable to remove contaminants from a contaminated fluid stream is provided. The process includes receiving the fluid stream containing contaminants. A first portion of the contaminants are removed from the fluid stream with a first scrubbing vessel. A first base solution reacts with the contaminants such that the contaminants enter a contaminant solution. A remaining portion of the contaminants from the fluid stream is then removed with a at least one additional scrubbing vessel, wherein a second base solution reacts with the contaminants such that part of the remaining portion of the contaminants enter a second solution. Water content is then removed from the fluid stream with a desiccating module, wherein the desiccating module outputs a clean fluid stream.

Abstract: The mercaptan-laden natural gas is contacted with a mercaptan-adsorbing sieve T1. The mercaptan-rich gaseous effluent obtained upon regeneration of sieve T2 is then contacted with an olefin-containing liquid feed in the presence of an acid catalyst. Under suitable conditions, the mercaptans are absorbed in the liquid feed and they react with the olefins so as to form solvent-soluble sulfides. A solvent regeneration stage allows the capture agent to be recycled.

Abstract: An apparatus and a method that uses generated alkaline, alkaline-earth, and/or silica/alumina aerosols as a multifunctional additive to scavenge sulfur oxides in flue gas, minimize poisoning effects of sulfur oxides on mercury sorbent performance, and enhance particulate matter capture in electrostatic precipitators and other particulate filter devices by conditioning the fly ash.

Abstract: A zeolite adsorbent for desulfurization and a method of preparing the same. More particularly, a zeolite adsorbent for desulfurization in which the relative crystallinity of Y zeolite that is ion exchanged with Ag is 45% to 98%, and a method of preparing the same. The zeolite adsorbent for desulfurization has excellent crystallinity over the known zeolite adsorbent for desulfurization, and thus has better performance of adsorbing sulfur compounds though it contains less Ag. Accordingly, when the sulfur compounds of a fuel gas are removed by employing the zeolite adsorbent for desulfurization, a desulfurizing device that is bettereven with less cost can be constructed.

Abstract: A process and system for removing sulfur oxide, other gases, and particulate from a flue gas. The process includes treating flue gas with a slurry formed from water, an alkaline reagent, and the purge stream from a wet scrubber in a spray dryer, thereby producing a dry by-product. The process further includes filtering the flue gas to remove at least a portion of the dry by-product, wet scrubbing the flue gas exiting the filter in a wet scrubber, adding a lime or limestone reagent to the wet scrubber, and producing gypsum. Activated carbon may be injected into the flue gas upstream of the filtering step and particulate may be removed from the flue gas upstream of the spray dryer.

Abstract: A process of using solutions containing thiosulfate and/or chloride salt reagents to remove SO3 and H2SO4 acid gases from a flue gas. The solution is injected into a moving volume of flue gas to achieve a droplet size that enables the solution to dry on contact with the flue gas, generating dried particles of the reagent that react with the SO3 and H2SO4 acid gases yielding a salt precipitate. SO2 present in the flue gas may also be absorbed with the solution, with a subsequent reaction yielding bisulfite species that, upon drying of the droplet, react with the SO3 and H2SO4 acid gases to form salts that are removed from the gas. The removal of these acid gases from a flue gas reduce corrosion of equipment used in coal or oil fired power plants downstream of the injection cite.

Abstract: The inventive method for hydrogen sulphide and/or mercaptans decomposition consists in passing hydrogen sulphide and/or mercaptan-containing gas at a temperature less than 200° C. through a hard material layer (catalyst) which decomposes said hydrogen sulphide or mercaptans in such a way that hydrogen or hydrocarbons are released and sulphur-containing compounds are formed on a material surface. Said hard material is placed in a liquid medium layer. Said invention makes it possible to use a hard material (catalyst) without a periodical regeneration thereof.

Abstract: The invention relates to an apparatus and method for reducing contaminants from industrial processes. More particularly, the invention is directed to a method of sequestering pollutants from flue gases in operational plants. The method includes sequestering contaminants from a point source by reacting an alkaline material with a flue gas containing contaminants to be sequestered, wherein the reaction has a rapid mass transfer rate to sequester at least a portion of the contaminants.

Abstract: Exhaust (Flue) gas of boiler is introduced through gas inlet part (port) (2) of flue-gas desulfurization apparatus (system), and absorbent liquid sprayed from spray nozzle (5) of absorbent liquid spray section (4) is trapped (stored) in liquid trapping (recirculation tank) section (7). There, agitation is performed by means of propeller (11) of oxidation agitator (8) to thereby oxidize SO2 absorbed from the exhaust (flue) gas into gypsum. In the liquid trapping section (7), oxidation air is fed from posterior air pipe (10) and anterior air pipe (13) behind and ahead of liquid propulsion (to the rear and front of a liquid discharge) by the propeller (11). Thus, even when the amount of oxidation air must be increased in accordance with an increase of boiler load, the oxidation efficiency can be enhanced without increasing of the number of agitators.

Abstract: The invention provides a process for the removal of polysulfanes from gas streams formed during H2S synthesis.

Abstract: A process and device for purifying flue gases in refuse incineration plants during regeneration of a catalyst which serves for reducing nitrogen oxides, by, in a first step, removing acidic pollutant gases from the flue gas in a wet or dry manner, in a second step adding ammonia for reducing nitrogen oxides to the flue gas purified in the first step, in a third step feeding the flue gas admixed with the ammonia to a catalyst, where the catalyst is heated at a controlled heat-up rate for regeneration, which leads to liberation of ammonia, where the amount of ammonia added in the second step and the heat-up rate in the third step are controlled by the amount of a pollutant gas selected from the group of ammonia, and which the purified flue gas contains.

Abstract: In a method for processing flue gases, flue gases from an incineration plant for non-condensable gases of a kraft pulp mill are scrubbed by means of a calcium compound. The calcium compound is lime mud taken from the chemical recirculation of the kraft pulp mill after causticization and before a lime reburning kiln, and it is used in the scrubbing of gas as a substance reacting with sulphur dioxide.

Abstract: A method of deacidizing a gaseous effluent including acid compounds includes the following stages: a) contacting the gaseous effluent with a first fraction of an absorbent solution containing reactive compounds with at least two amine functions, so as to obtain a gaseous effluent depleted in acid compounds and a liquid effluent laden with acid compounds, b) contacting the liquid effluent obtained in stage a) with a second fraction of absorbent solution laden with molecules more acid than the acid compounds, so as to cause formation of a first liquid phase depleted in acid compounds and a second liquid phase enriched in acid compounds and laden with more acid molecules, c) separating the first phase from the second phase, and d) regenerating the second phase so as to release a gas stream rich in acid compounds and a liquid stream poor in acid compounds and laden with more acid molecules.