Process and apparatus for gasifying solid carbonaceous material

Details Process and apparatus for gasifying solid carbonaceous material Process and apparatus for gasifying solid carbonaceous material

1998-07-13

2000-11-21

Freay, Charles G.

Power plants

Combustion products used as motive fluid

60 3912, 34 86, 34330, F02C 1310, F02B 4300, F26B 1900

Patent

active

061485993

ABSTRACT:
A process and apparatus for gasifying high moisture content carbonaceous material by introducing a solid first carbonaceous material (1) into at least one pressurized drier vessel (2), the first carbonaceous material having a moisture content above about 30 wt % wet basis. The moisture content of the first carbonaceous material is reduced by passing a hot flue gas having a low oxygen content through the pressurized drier vessels. Then the dried first carbonaceous material is transferred from the drier vessels to a pressurized carbonizer vessel (10). The dried material is partially gasified in the carbonizer vessel to produce a high temperature fuel gas (18) and a solid residual material (16). The solid residual material is transferred to a pressurized combustion chamber (4) to produce the low oxygen content flue gas for the pressurized drier vessels. The fuel gas and the flue gas can be used in a topping combustor in which gases are burnt in the presence of air to produce hot turbine feed gases which are then supplied to a turbine in a combined cycle gas turbine for generating electricity. Low moisture fuels can also be effectively utilized in this process by adding water separately or with the fuel in the form of a paste or slurry.

REFERENCES:
patent: 3309780 (1967-03-01), Goins
patent: 4150953 (1979-04-01), Woodmansee
patent: 5171406 (1992-12-01), Shang et al.
patent: 5953899 (1999-09-01), Rao et al.

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