Process for gasifying carbonaceous material from a recycled condensate slurry
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.
- Assignee:
- Department of Energy
- Patent Number(s):
- US 4244706
- OSTI ID:
- 6437808
- Country of Publication:
- United States
- Language:
- English
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010404* -- Coal
Lignite
& Peat-- Gasification
010800 -- Coal
Lignite
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CARBONACEOUS MATERIALS
COAL GASIFICATION
DISPERSIONS
ELEMENTS
GASIFICATION
HYDROGEN COMPOUNDS
LIQUID WASTES
MATERIALS
MIXTURES
NONMETALS
OXYGEN
OXYGEN COMPOUNDS
RECYCLING
SLURRIES
STEAM
SUSPENSIONS
THERMOCHEMICAL PROCESSES
WASTE WATER
WASTES
WATER