Method for the desulfurization of hot product gases from a coal gasifier
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. 2 figs.
- Research Organization:
- USDOE Morgantown Energy Technology Center, WV
- Sponsoring Organization:
- USDOE
- Assignee:
- Dept. of Energy
- Patent Number(s):
- 4,769,045
- Application Number:
- 07/144,683
- OSTI ID:
- 6742286
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GASIFICATION
DESULFURIZATION
FERRIMAGNETIC MATERIALS
FERRITES
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HOT GAS CLEANUP
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
OXYGEN COMPOUNDS
PURIFICATION
REMOVAL
SORBENT RECOVERY SYSTEMS
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS GAS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS