Furnaces – Process – Treating fuel constituent or combustion product
Patent
1995-03-29
1996-09-10
Bennett, Henry A.
Furnaces
Process
Treating fuel constituent or combustion product
110215, 110347, 110245, F23T 1100, F23T 1500, F23D 100
Patent
active
055535577
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.
REFERENCES:
patent: 4756890 (1988-07-01), Tang et al.
patent: 4843981 (1989-07-01), Goldbach et al.
patent: 5078064 (1992-01-01), Breen et al.
patent: 5396849 (1995-03-01), Boyd
patent: 5441714 (1995-08-01), Oakes et al.
Bennett Henry A.
Foster Wheeler Energy Corporation
Kice Warren B.
Tinker Susanne C.
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