Coal pretreatment and gasification process
Patent
·
OSTI ID:5222761
A process for converting a finely divided carbonaceous material, particularly coal, to a fuel gas. A finely divided or pulverized carbonaceous feed material, such as coal, is pretreated at a temperature of about 700 to 800/sup 0/F in order to destroy the caking properties of a caking coal feed in a fluidized pretreatment zone, or, alternatively to dry a non-caking coal feed. The pretreated coal is passed from a pretreatment zone to a gasification zone wherein the carbonaceous feed material or coal is maintained as a fluid bed at selected conditions for converting the pretreated material to ash and a gaseous mixture. During the pretreatment of the feed material, hot off gases are formed and the hot off gases, which generally comprise steam, tars, oils, and carbonaceous fines, are passed from the pretreatment zone to the underside of the fluid bed in the gasification zone. The steam contained in the off gases is reacted with the coal in the fluidized bed in the gasification zone for converting the coal feed material to ash and the fuel gas product. The off gases also provide heat for maintaining the desired temperature conditions in the gasification zone. The tars and oils in the off gases are substantially destroyed during passage upwardly through the fluidized bed in the gasification zone. The fines in the off gases are converted by the gasification reaction in the gasification zone to form a part of the fuel gas and the ash. The fuel gas is withdrawn from the upper portion of the gasification zone and ash is withdrawn from the bottom of the gasification zone. 8 claims, 1 figure.
- Assignee:
- Inst. of Gas Tech.
- Patent Number(s):
- US 4057402
- OSTI ID:
- 5222761
- Country of Publication:
- United States
- Language:
- English
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