Circulating fluid bed steam generator NO.sub.x control

Details Circulating fluid bed steam generator NO.sub.x control Circulating fluid bed steam generator NO.sub.x control

1995-05-05

1997-08-26

Kamen, Noah P.

Furnaces

Process

Treating fuel constituent or combustion product

122 4D, F23J 1100

Patent

active

056601255

ABSTRACT:
A method for enhancing the minimization of NO.sub.x control in a circulating fluid bed steam generator into which there is injected fuel, fluidizing air, a lower level of combustion air and an upper level of combustion air. The fuel is injected at a first location, the fluidizing air is injected at a second location, the lower level of combustion air is injected at a third location and the upper level of combustion air is injected at a fourth location. In order to enhance the minimization of NO.sub.x control within a circulating fluid bed steam generator the lower level combustion air as well as the upper level combustion air are each biased in the horizontal plane as well as the vertical plane so as to thereby control the lower level combustion air flow and the upper level combustion air flow such that local stoichiometries within the circulating fluid bed steam generator are maintained within a range of 70% stoichiometry to 90% stoichiometry.

REFERENCES:
patent: 4962711 (1990-10-01), Yamauchi et al.
patent: 5297622 (1994-03-01), Brannstrom et al.
patent: 5345883 (1994-09-01), Panos

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