System for decreasing NO.sub.x emissions from a fluidized bed re

Details System for decreasing NO.sub.x emissions from a fluidized bed re System for decreasing NO.sub.x emissions from a fluidized bed re

1994-06-13

1995-10-31

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

422169, 422170, 422173, 422198, 423235, 4232391, 122 4D, 110235, 110245, 110215, B01J 802

Patent

active

054627184

ABSTRACT:
A system and method are disclosed for lowering NO.sub.x levels in flue gases of a fluidized bed reactor using selective non-catalytic reduction. A reactor is connected to a separator by a duct, and a reactant is introduced into the duct for decreasing NO.sub.x levels in the flue gases passing from the reactor, through the duct, and into the separator. The reactant, such as ammonia or urea, is selectively injected into a gaseous-rich region of the duct, near an upper, inner portion of the duct, so that a high degree of mixing of the reactant with flue gases is achieved while maintaining a low degree of mixing of the reactant with the particulate materials. The point of injection of the reactant into the duct is also at a location nearer to the reactor than to the separator to provide for increased residence time. In this manner, the reactant is used efficiently while obtaining the desired lowering of NO.sub.x levels in the flue gases.

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