Power plants – Combustion products used as motive fluid
Patent
1996-04-10
1998-01-13
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
60 3912, F02C 328
Patent
active
057066450
ABSTRACT:
Polluting NO.sub.x gas values are removed from off-gas of a multi-stage coal combustion process which includes an initial carbonizing reaction, firing of char from this reaction in a fluidized bed reactor, and burning of gases from the carbonizing and fluidized bed reactions in a topping combustor having a first, fuel-rich zone and a second, fuel-lean zone. The improvement by means of which NO.sub.x gases are removed is directed to introducing NO.sub.x -free oxidizing gas such as compressor air into the second, fuel-lean zone and completing combustion with this source of oxidizing gas. Excess air fed to the fluidized bed reactor is also controlled to obtain desired stoichiometry in the first, fuel-rich zone of the topping combustor.
REFERENCES:
patent: 5161367 (1992-11-01), Scalzo
patent: 5255506 (1993-10-01), Wilkes et al.
patent: 5469698 (1995-11-01), Garcia-Mallol
Bonk Donald L.
Dowdy Thomas E.
Mollot Darren J.
Casaregola Louis J.
Hamel Stephen D.
Jarr Lisa A.
Moser William R.
The United States of America as represented by the United States
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