Method for reducing waterwall corrosion in low NO.sub.x boilers

Details Method for reducing waterwall corrosion in low NO.sub.x boilers Method for reducing waterwall corrosion in low NO.sub.x boilers

1998-06-18

2000-07-11

Lazarus, Ira S.

Furnaces

Process

Treating fuel constituent or combustion product

110348, 110347, 110119, 431 2, 431 10, F23B 700, F23N 102

Patent

active

060856734

ABSTRACT:
A method to reduce waterwall corrosion in a low NO.sub.x boiler includes the steps of locating a waterwall area of a low NO.sub.x boiler where oxidizing conditions exist and deposition of FeS is likely. The combustion air input at the waterwall area is biased to reduce FeS deposition on the waterwall. The biased combustion air input increases the oxidation rate of FeS.sub.2 so as to reduce FeS deposition on the waterwall. The biased combustion air input may be achieved by increasing the air-to-fuel ratio of one burner while reducing the air-to-fuel ratio of another burner, such that the overall air-to-fuel ratio in the low NO.sub.x boiler is substantially constant.

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