METHOD OF THE SELECTIVE NON-CATALYTIC PURIFICATION OF THE FLUE GASES FROM NITROGEN OXIDES Russian patent published in 2008 - IPC B01D53/56 

FIELD: chemical industry; other industries; methods of the selective non-catalytic purification of the flue gases from nitrogen oxides.

SUBSTANCE: the invention is pertaining to the processes of the selective non-catalytic purification of the flue gases from nitrogen oxides and may be used for reduction of the contents of the nitrogen oxides in the low-temperature flue gases from the fuel-burning installations. The method of the selective non-catalytic purification of the flue gases from nitrogen oxides provides for feeding in the flow of the end flue gases having the temperature 200-700°С of the gaseous reduction mixture previously produced by the joint thermal decomposing of carbamide and hydrogen peroxide at the temperature of 150-500°С. For production of the gaseous reduction mixture they use either the water solutions of carbamide peroxihydrate or carbamide and hydrogen pyroxide, either carbamide peroxihydrate in the solid kind. The reduction gas mixture is fed by means of the carrier gas, in the capacity of which use the water steam, the flue gases, the compressed air, nitrogen. The concentration of the water solutions of carbamide and hydrogen peroxide makes 1-40 mass % and 0.5-20 mass %. The technical result of the invention is the increase of efficiency of purification of the flue gases from nitrogen at the low temperatures without formation of the secondary contaminants.

EFFECT: the invention ensures the increased efficiency of purification of the flue gases from nitrogen at the low temperatures without formation of the secondary contaminants.

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