MILD GASIFICATION COMBINED-CYCLE POWERPLANT
First Claim
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1. A hybrid integrated gasification combined cycle (IGCC) plant, the hybrid IGCC comprising:
- a carbonizer that forms a syngas;
a syngas cooler;
a warm gas cleanup system; and
a gas turbine fired by the syngas,wherein the carbonizer is comprised of a draft tube surrounded by a fluidized bed of char, in which solid fuel to said carbonizer is injected in an upward direction into said draft tube, and said char in said fluidized bed is both fluidized and gasified by the addition of steam and air into the bottom of said char bed.
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Abstract
The invention provides a hybrid integrated gasification combined cycle (IGCC) plant for carbon dioxide emission reduction and increased efficiency where the syngas is maintained as a temperature above a tar condensation temperature of a volatile matter in the syngas. The invention also provides methods and equipment for retrofitting existing IGCC plants to reduce carbon dioxide emissions, increase efficiency, reduce equipment size and/or decrease the use of water, coal or other resources.
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Citations
27 Claims
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1. A hybrid integrated gasification combined cycle (IGCC) plant, the hybrid IGCC comprising:
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a carbonizer that forms a syngas; a syngas cooler; a warm gas cleanup system; and a gas turbine fired by the syngas, wherein the carbonizer is comprised of a draft tube surrounded by a fluidized bed of char, in which solid fuel to said carbonizer is injected in an upward direction into said draft tube, and said char in said fluidized bed is both fluidized and gasified by the addition of steam and air into the bottom of said char bed. - View Dependent Claims (2, 3, 4, 8, 11, 13, 14, 16, 18, 19, 20, 21, 27)
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25. A method of removing mercury from coal, the method comprising treating coal in a precombustion thermal treatment of coal (PCTTC) system that comprises an atmospheric-pressure dual-stage fluidized bed combustor, wherein combustion occurs in a lower fluidized bed, the lower fluidized bed incorporating coolant tubes to maintain its temperature below a fusion temperature of the ash in the fuel, and wherein one or more products of combustion from the lower fluidized bed pass through a distributor plate overhead and into a second fluidized bed, the second fluidized bed containing the coal being dried.
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26. (canceled)
Specification