Furnaces – Process – Burning pulverized fuel
Patent
1990-04-30
1993-03-02
Favors, Edward G.
Furnaces
Process
Burning pulverized fuel
44504, 44605, 44627, 110232, 110263, F23D 100
Patent
active
051899647
ABSTRACT:
A continuous fluidized-bed combustion process for particulate carbonaceous feedstock of high ash content. The feedstock fuel is prepared from culm or mine tailings washed in a dense media and crushed to yield a fuel product having an ash content in a range of about 30 percent to about 50 percent, by weight. The feedstock fuel is mixed with fine particles of scavenging material, such as limestone or dolomite, and the resulting feedstock mixture is burned in a circulating fluidized-bed combustion chamber. A portion of the ash remaining after combustion is discharged out the bottom chamber, the remainder being carried with the combustion gases through a hot cyclone and heat exchangers for generating power. The ash within these gases is separated and recirculated through the fluidized bed, and the combustion gases are discharged.
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Fraas, A. P., "A Fluidized Bed Combustion System" CEP Technical Manual--Coal Processing Technology, American Institute of Chemical Engineers, New York, NY (1974), pp. 28-29.
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EPRI Report Summary, "Recovering Clean Coal from Anthrocite Culm", EPRIC8-5423-Interim Report, Electric Power Research Institute, Palo Alto, CA Nov. 1987.
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