Combined gas and steam turbine process
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United States of America Patent
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Mar 5, 1991
Issued Date -
N/A
app pub date -
Oct 18, 1989
filing date -
Apr 17, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a process of carrying out a combined gas turbine and steam turbine process of increased efficiency. A fuel gas is produced at a temperature of from 900.degree. to 1100.degree. C. in a circulating fluidized bed by a gasification of 70 to 95 wt. % of the carbon contained in the carbonaceous material and is treated at a temperature of from 850.degree. to 950.degree. C. with suspended solids consisting of calcium hydroxide, calcium oxide and/or calcium carbonate-containing solids to remove pollutants. The main portion of the fuel gas is burnt to produce a gas which is used to operate the gas turbine and which contains at least 5% by volume oxygen and is at a temperature of at least 1000.degree. C. Combustion of the carbonaceous gasification residue to produce process steam is performed in a second circulating fluidized bed at a temperature of from 800.degree. to 950.degree. C. under near-stoichiometric conditions by a treatment with oxygen-containing gases, which are supplied on different levels in at least two partial streams and mainly consist of exhaust gas from the gas turbine. The desulfurized fuel gas is preferably cooled to a temperature in the range from 350.degree. to 600.degree. C. and is freed from halides.
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