A method for denitrification of flue gases and a system, wherein flue gases generated in a rotary kiln are conveyed to a calcining zone for the deacidification of raw cement meal. Aqueous ammonia solution, ammonia, or ammonia-releasing substances for denitrifying the flue gases injected into the calcining zone according to the method of selective non-catalytic reduction (SNCR), and the flue gas stream, together with an ammonia slip generated during the denitrification, is passed through a heat exchanger and through at least one dedusting device. The flue gas is guided through a exhaust gas line via a catalyst for the decomposition of excess ammonia with residues of nitrogen oxide in accordance with a method of selective catalytic reduction (SCR), wherein the catalyst is arranged in a reactor provided in the exhaust line, and is no larger than is required for a sufficient decomposition of the ammonia.

The gaseous effluent is contacted with an aqueous solution comprising at least one amine and at least one amine degradation inhibiting compound. A stainless steel withstanding corrosion upon contact with the amine degradation inhibiting compound is first selected. Equipments whose surfaces in contact with the aqueous solution are made from this stainless steel are used.

A method for reducing pollution in a cement kiln environment and a system for treating cement kiln exhaust gas are provided. The method includes the steps of: treating a cement kiln exhaust gas stream with a treating fluid, such as a water soluble alkaline-earth metal sulfide. In one application, the treating fluid is injected by spraying droplets into the cement kiln exhaust gas stream. A system for treating cement kiln exhaust gas includes a reagent containing a water soluble alkaline-earth metal sulfide in water, and a nozzle to spray the reagent into the cement kiln exhaust gas stream.

A method for treating flue gas including sulphur oxides and nitrogen oxides includes: cooling the furnace outlet flue gas; contacting it with a sulphur oxide neutralization agent, reducing the sulphur oxides by desulphurization reactions, and obtaining residues; separating the residues from the flue gas; reheating the flue gas; injecting a nitrogen oxide neutralization agent therein; and placing the reheated flue gas and the nitrogen oxide neutralization agent in contact with a catalyst, reducing the nitrogen oxides by denitrification reactions, the cooling of the flue gas achieved by reheating, inside the same heat exchanger, the flue gas separated from the desulphurization residues. The reheated flue gas is mixed, after injecting the nitrogen oxide neutralization agent, with the flue gas cooled after being placed in contact with the sulphur oxide neutralization agent, the separation of the residues and the contact with the catalyst being carried out inside a single separation device.

The present invention is an apparatus and method having dynamically reconfigurable air flow paths for supporting polishing and non-polishing operations. The invention includes a first baghouse section and a second baghouse section coupled to the first baghouse section via conduit. A set of valves is disposed along the conduit to direct air flow through the baghouse apparatus. A controller configures the baghouse apparatus by actuating at least one valve in the set of valves. The controller automatically configures the baghouse apparatus in either a polishing operation or a non-polishing operation based on a predetermined criteria.

A method for decreasing an amount of a harmful substance of a chlorine-containing off-gas stream formed or used in a thermal treatment of a material may comprise dividing the chlorine-containing off-gas stream into a main stream and a substream, separating at least some chlorine from the main stream, lowering an amount of the harmful substance in the main stream by introducing a chlorine-containing additive into the main stream to enhance separation of the harmful substance, and filtering the substream such that a filter cake separated from the substream comprises at least part of the chlorine-containing additive.

Ceramic candle filter and use of the filter in the removal of particulate matter in form of soot, ash, metals and metal compounds, together with hydrocarbons and nitrogen oxides being present in process off-gas or engine exhaust gas, the filter comprises a combined SCR and oxidation catalyst arranged at least on the dispersion side and/or within wall of the filter, the combined SCR and oxidation catalyst comprises palladium, a vanadium oxide and titania.

A method of producing a gas separation membrane, includes: an ultraviolet ozone treatment of irradiating a resin layer precursor which has a siloxane bond with light containing ultraviolet rays having a wavelength of 185 nm and ultraviolet rays having a wavelength of 254 nm to form a resin layer that contains a compound having a siloxane bond, in which a cumulative irradiation dose of the ultraviolet rays having a wavelength of 185 nm is in a range of 6.0 to 17.0 J/cm.sup.2, a cumulative irradiation dose of the ultraviolet rays having a wavelength of 254 nm is in a range of 120 to 330 J/cm.sup.2, and the compound having a siloxane bond contained in the resin layer includes a repeating unit represented by Formula (2) or a repeating unit represented by Formula (3).

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For purifying waste gas charged with nitrogen oxides in a reactor with heat-accumulator chambers containing heat-accumulator materials, the raw gas to be purified alternately enters one of the heat-accumulator chambers. Mixed with a reducing agent for the reduction of the nitrogen oxides, it is supplied to a catalyst for the reduction of the nitrogen oxides, and the clean gas heats the heat-accumulator material in the heat-accumulator chamber which the clean gas exits. A partial flow is taken therefrom, heated by means of a heat source and, mixed with a reducing agent, supplied again to the heat-accumulator chamber which the raw gas enters. This heated, recirculated gas forms the only heat source for the overall system.

The present invention relates to a carbon dioxide absorbent comprising a triamine, a diamine and a dialkylene glycol dialkyl ether or trialkylene glycol dialkyl ether. The carbon dioxide absorbent according to the present invention can improve the carbon dioxide absorption capacity, absorption rate, and regeneration performance thereof simultaneously by using the triamine as a main absorbent, the diamine as a rate enhancer, the dialkylene glycol dialkyl ether or trialkylene glycol dialkyl ether as a fine disproportionation agent and a regeneration promoter.