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A process for reducing nitrogen oxides in a combustion effluent is presented. The process involves introducing a nitrogenous treatment agent into the effluent under conditions effective to create a treated effluent having reduced nitrogen oxides concentration such that ammonia is present in the trea

A process for reducing nitrogen oxides in a combustion effluent is presented. The process involves introducing a nitrogenous treatment agent into the effluent under conditions effective to create a treated effluent having reduced nitrogen oxides concentration such that ammonia is present in the treated effluent; and then contacting the treated effluent under conditions effective to reduce the nitrogen oxides in the effluent with a nitrogen oxides reducing catalyst.

대표청구항 ▼

A process for the reduction of nitrogen oxides in the effluent from the combustion of a carbonaceous fuel, the process comprising: (a) introducing a nitrogenous treatment agent into the effluent at an effluent temperature between about 1200°F. and about 2100°F. and a molar ratio of treatment agent n

A process for the reduction of nitrogen oxides in the effluent from the combustion of a carbonaceous fuel, the process comprising: (a) introducing a nitrogenous treatment agent into the effluent at an effluent temperature between about 1200°F. and about 2100°F. and a molar ratio of treatment agent nitrogen to baseline nitrogen oxides level of about 1:10 to about 10:1, wherein said treatment agent further comprises an enhancer selected from the group consisting of hexamethylenetetramine, an oxygenated hydrocarbon, an ammonium salt of an organic acid, a heterocyclic hydrocarbon having at least one cyclic oxygen, a 5- or 6-membered heterocyclic hydrocarbon having at least one cyclic nitrogen, a hydroxy amino hydrocarbon, sugar, molasses, and mixtures thereof when the effluent temperature is below about 1600°F., and further wherein said treatment agent is introduced under conditions effective to create a treated effluent having reduced nitrogen oxides concentration, wherein the conditions under which said nitrogenous treatment agent is introduced are such that ammonia is present in the treated effluent; and (b) contacting the treated effluent under conditions effective to reduce the nitrogen oxides in the effluent with a catalyst effective for the reduction of nitrogen oxides in the presence of ammonia.