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Title: Method for the desulfurization of hot product gases from a coal gasifier

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. 2 figs.

Inventors:
Publication Date:
Research Org.:
USDOE Morgantown Energy Technology Center, WV
Sponsoring Org.:
USDOE
OSTI Identifier:
6742286
Patent Number(s):
4,769,045
Application Number:
07/144,683
Assignee:
Dept. of Energy
DOE Contract Number:  
EDB-87-061737
Resource Type:
Patent
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL GASIFICATION; HOT GAS CLEANUP; FUEL GAS; DESULFURIZATION; SYNTHESIS GAS; CALCIUM COMPOUNDS; FERRITES; HYDROGEN SULFIDES; REMOVAL; SORBENT RECOVERY SYSTEMS; ZINC COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; FERRIMAGNETIC MATERIALS; FLUIDS; FUELS; GAS FUELS; GASES; GASIFICATION; HYDROGEN COMPOUNDS; IRON COMPOUNDS; MAGNETIC MATERIALS; MATERIALS; OXYGEN COMPOUNDS; PURIFICATION; SULFIDES; SULFUR COMPOUNDS; THERMOCHEMICAL PROCESSES; TRANSITION ELEMENT COMPOUNDS; 010402* - Coal, Lignite, & Peat- Purification & Upgrading

Citation Formats

Grindley, T. Method for the desulfurization of hot product gases from a coal gasifier. United States: N. p., 1988. Web.
Grindley, T. Method for the desulfurization of hot product gases from a coal gasifier. United States.
Grindley, T. Tue . "Method for the desulfurization of hot product gases from a coal gasifier". United States. https://www.osti.gov/servlets/purl/6742286.
@article{osti_6742286,
title = {Method for the desulfurization of hot product gases from a coal gasifier},
author = {Grindley, T},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6742286}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {9}
}

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