Process for gasifying carbonaceous material from a recycled cond

Details Process for gasifying carbonaceous material from a recycled cond Process for gasifying carbonaceous material from a recycled cond

1979-09-10

1981-01-13

Kratz, Peter F.

Gas: heating and illuminating

Processes

Coal and water

48206, 48DIG7, 201 4, 252373, C10J 354

Patent

active

042447062

ABSTRACT:
Coal or other carbonaceous material is gasified by reaction with steam and oxygen in a manner to minimize the problems of effluent water stream disposal. The condensate water from the product gas is recycled to slurry the coal feed and the amount of additional water or steam added for cooling or heating is minimized and preferably kept to a level of about that required to react with the carbonaceous material in the gasification reaction. The gasification is performed in a pressurized fluidized bed with the coal fed in a water slurry and preheated or vaporized by indirect heat exchange contact with product gas and recycled steam. The carbonaceous material is conveyed in a gas-solid mixture from bottom to top of the pressurized fluidized bed gasifier with the solids removed from the product gas and recycled steam in a supported moving bed filter of the resulting carbonaceous char. Steam is condensed from the product gas and the condensate recycled to form a slurry with the feed coal carbonaceous particles.

REFERENCES:
patent: 2591595 (1952-04-01), Ogorzaly
patent: 2595234 (1902-05-01), Eastman
patent: 3607157 (1971-07-01), Schlinger et al.
patent: 3957460 (1976-05-01), Lee
patent: 4017272 (1977-04-01), Aniver et al.
patent: 4067700 (1978-01-01), Switzer
Synthane Gasifier Effluent Streams, McMichael et al., 3/1977, PERC/RI-77/4.

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