Reduction of nitrogen oxide emissions from calciners

Details Reduction of nitrogen oxide emissions from calciners Reduction of nitrogen oxide emissions from calciners

C - Chemistry, Metallurgy

10

B

202/9

C10B 57/18 (2006.01) F23G 7/06 (2006.01)

Patent

CA 1201409

REDUCTION OF NITROGEN OXIDE EMISSIONS FROM CALCINERS ABSTRACT OF THE DISCLOSURE Disclosed are method and apparatus for reducing the emissions of nitrogen oxides from incineration systems. More particularly, the invention relates to the reduction of nitrogen oxide emissions from thermal incinerators employed in installations for calcining solid carbonaceous materials such as petroleum coke and anthracite coal. A hot effluent gas stream containing hydrocarbon vapors and entrained carbonaceous solid particles is removed from a calciner and introduced into a thermal incinerator for combusion of the vapors and the particles. The improvement comprises effecting preliminary combustion of the hydrocarbon vapors but not the carbonaceous solid particles in the gas stream using sub- stantially the stoichiometric amount of combustion air, and introducing the resultant gas that is substantially free of hydrocarbons and oxygen into the thermal incinerator and therein effecting combustion of the carbonaceous solid particles with additional combustion air, thereby to reduce the nitrogen oxide emissions from the incinerator.

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