Furnaces – Process – Treating fuel constituent or combustion product
Patent
1989-03-13
1990-10-30
Favors, Edward G.
Furnaces
Process
Treating fuel constituent or combustion product
110347, F23J 1100, F23J 1500
Patent
active
049660870
ABSTRACT:
A fluidized combustion process is disclosed which is especially suitable for fluidized bed burning of coal and coke while minimizing emissions of NOx. A single, dense phase fluidized bed or particles is used to burn the coal or coke with air or oxygen containing gas to produce heat and a flue gas containing CO, CO2, O2 and NOx. A CO combustion promoter on a porous support is present in an amount sufficient to increase the combustion of CO to CO2 in the dense bed. Preferably the CO combustion promotor is disposed on particles which either float or have a settling velocity which is smaller than the settling velocity of the average particles in the dense phase fluidized bed. CO combustion promoter preferably floats or segregates in the dense phase fluidized bed so that a majority of the combustion promoter is present in an upper one half of the dense bed. Maintaining a reducing atmosphere in the lower one half of the dense bed converts NOx produced during combustion to nitrogen in the reducing atmosphere. Preferably an external means is provided to recover entrained CO combustion promoter from coal, ash, and fines generated in the fluidized bed. An external, dense phase fluidized bed may be used to effect separation by density differences, or flotation separation, using a liquid with a density intermediate the density of the promoter and the fines may be used.
REFERENCES:
patent: 4483259 (1984-11-01), Muiayem et al.
Favors Edward G.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Stone Richard D.
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