Coal gasification cogeneration process

Details Coal gasification cogeneration process Coal gasification cogeneration process

1989-05-24

1990-10-16

Kratz, Peter

Gas: heating and illuminating

Processes

Coal

48203, 423168, 423171, 423172, 423541R, 423542, 423555, C01J 314, C01J 316, C01J 384, C01B 1750

Patent

active

049635131

ABSTRACT:
The present invention relates to the coproduction of a combustible gas stream usable as an energy source, a sulfur-dioxide-containing second gas stream usable as a source of oxidant in the gasification of coal, and a sulfur-dioxide-containing third gas stream usable as a feedstock for the production of sulfuric acid. The process includes heating coal in a coal gasification zone in the presence of an oxygen and sulfur dioxide-containing atmosphere under partial coal gasifying conditions to produce a carbonaceous char and a crude coal gas stream. Sulfur-containing compounds are removed from the coal gas stream and converted to elemental sulfur. The carbonaceous char is combined with gypsum to form a feed mixture. The non-gypsum portion of the feed mixture contains sufficient reducing potential to release substantially all of the sulfur in the gypsum as gaseous compounds of sulfur in a +4 or lower oxidation state. The feed mixture is heated under reducing conditions to produce a sulfur-dioxide-containing second gas stream recovered at an early statge of the reaction a sulfur-dioxide-containing third gas stream and a solid sintered product. The sulfur-dioxide-containing second gas stream is recycled back to the gasification zone to provide th eoxidant for the coal gasification.

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