Gas: heating and illuminating – Processes – Coal and water
Patent
1988-01-13
1988-09-06
Kratz, Peter
Gas: heating and illuminating
Processes
Coal and water
48206, 48210, 252373, 423230, 423231, C10J 316, C10K 132
Patent
active
047690453
ABSTRACT:
The gasification of sulfur-bearing coal produces a synthesis gas which contains a considerable concentration of sulfur compounds especially hydrogen sulfide that renders the synthesis gas environmentally unacceptable unless the concentration of the sulfur compounds is significantly reduced. To provide for such a reduction in the sulfur compounds a calcium compound is added to the gasifier with the coal to provide some sulfur absorption. The synthesis gas from the gasifier contains sulfur compounds and is passed through an external bed of a regenerable solid absorbent, preferably zinc ferrite, for essentially completed desulfurizing the hot synthesis gas. This absorbent is, in turn, periodically or continuously regenerated by passing a mixture of steam and air or oxygen through the bed for converting absorbed hydrogen sulfide to sulfur dioxide. The resulting tail gas containing sulfur dioxide and steam is injected into the gasifier where the sulfur dioxide is converted by the calcium compound into a stable form of sulfur such as calcium sulfate.
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Hamel Stephen D.
Hightower Judson R.
Kratz Peter
Larcher Earl L.
The United States Department of Energy
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