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Title: Method for the desulfurization of hot product gases from 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.

Inventors:
 [1]
  1. (Morgantown, WV)
Issue Date:
Research Org.:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
OSTI Identifier:
866709
Patent Number(s):
4769045
Assignee:
United States Department of Energy (Washington, DC) NETL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; desulfurization; hot; product; gases; coal; gasifier; gasification; sulfur-bearing; produces; synthesis; gas; contains; considerable; concentration; sulfur; compounds; especially; hydrogen; sulfide; renders; environmentally; unacceptable; unless; significantly; reduced; provide; reduction; calcium; compound; added; absorption; passed; external; bed; regenerable; solid; absorbent; preferably; zinc; ferrite; essentially; completed; desulfurizing; periodically; continuously; regenerated; passing; mixture; steam; air; oxygen; converting; absorbed; dioxide; resulting; tail; containing; injected; converted; stable; form; sulfate; stable form; significantly reduce; gas environment; hot product; solid absorbent; product gases; coal gasifier; product gas; gas containing; synthesis gas; sulfur dioxide; hydrogen sulfide; coal gas; sulfur compounds; significantly reduced; calcium sulfate; calcium compound; zinc ferrite; containing sulfur; coal produces; essentially complete; sulfur compound; /48/252/423/

Citation Formats

Grindley, Thomas. Method for the desulfurization of hot product gases from coal gasifier. United States: N. p., 1988. Web.
Grindley, Thomas. Method for the desulfurization of hot product gases from coal gasifier. United States.
Grindley, Thomas. Fri . "Method for the desulfurization of hot product gases from coal gasifier". United States. https://www.osti.gov/servlets/purl/866709.
@article{osti_866709,
title = {Method for the desulfurization of hot product gases from coal gasifier},
author = {Grindley, Thomas},
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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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