Combustion method

Details Combustion method Combustion method

1985-05-29

1986-10-14

Yuen, Henry C.

Furnaces

Process

Treating fuel constituent or combustion product

110347, 110245, 432 58, F23G 500, F22B 100

Patent

active

046165762

ABSTRACT:
In a two-stage combustion method first and second circulating fluidizing bed systems are utilized. The first bed system is operated under reducing (sub-stoichiometric) conditions so as to minimize NO.sub.x formation. Solids in the flue gases are separated and returned to the first bed system, while the flue gases are subjected to afterburning in the second bed system. Oxygen containing gas is supplied to the second bed system to effect afterburning, and additionally sulfur absorbing and/or NO.sub.x formation decreasing agents are supplied to the second system. When burning coal, the first system is operated at a temperature of about 700.degree.-1000.degree. C., while the second system is operated at about 600.degree.-950.degree. C. The flue gases may be cooled, just prior to effecting separation of the solids, in one or both of the bed systems.

REFERENCES:
patent: 3366080 (1968-01-01), Albertson
patent: 3888193 (1975-06-01), Kishigami et al.
patent: 4159682 (1979-07-01), Fitch et al.
patent: 4324544 (1982-04-01), Blake
patent: 4355601 (1982-10-01), Hattiangadi
patent: 4416418 (1983-11-01), Goodstine et al.
patent: 4434726 (1984-03-01), Jones
patent: 4446799 (1984-05-01), Andersen

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