F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
110/15
F27B 15/10 (2006.01) B01D 53/56 (2006.01) F23C 6/04 (2006.01) F23C 10/00 (2006.01) F23G 5/30 (2006.01) F27B 15/14 (2006.01)
Patent
CA 1169710
APPARATUS AND METHOD FOR REDUCTION OF NOx EMISSIONS FROM A FLUID BED COMBUSTION SYSTEM THROUGH STAGED COMBUSTION ABSTRACT OF THE DISCLOSURE Apparatus and method for the reduction of nitrogen oxides (NOx) in the emissions of a fuel burning fluidized bed combustion system. Using a staged combustion technique, an overfire air inlet is provided in the freeboard zone above the bed. In the first stage, residual oxygen (O2) in the off-gas just above the bed is held in the 0.4 to 0.8 range by the actual coal and air rates. In the second stage, carbon monoxide (CO) and unburned hydrocarbons, both present in the first stage off-gas, are combined with additional air using the overfire air inlet. CO levels in the final effluent are reduced with little or no increase in NOx emissions.
374089
Foster Wheeler Energy Corporation
Meredith & Finlayson
LandOfFree
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