Effectiveness of Gas Recirculation and Staged Combustion in Reducing NOx on a 560-MW Coal-Fired Boiler.

摘要

A field test program was conducted to determine the feasibility of using flue gas recirculation into the combustion air and two-stage combustion to reduce nitric oxide emissions on pulverized coal-fired utility boilers, RP530-1. Nitric oxide emissions were documented as a function of gas recirculation rate,excess oxygen level,unit load,and burner out-of-service pattern. Four basic boiler firing configurations were compared. Windbox gas recirculation is relatively ineffective in reducing NO emissions by comparison to two-stage combustion. No operational difficulties were encountered that would immediately preclude long term operation with flue gas recirculation or staged combustion although the program was not of sufficient duration to explore potential long term concerns with tube erosion or corrosion. The test program was conducted on a 560MW unit at the Hatfield's Ferry Station of West Penn Power.