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Title: In situ gasification process for producing product gas enriched in carbon monoxide and hydrogen

Abstract

The present invention is directed to an in situ coal gasification process wherein the combustion zone within the underground coal bed is fed with air at increasing pressure to increase pressure and temperature in the combustion zone for forcing product gases and water naturally present in the coal bed into the coal bed surrounding the combustion zone. No outflow of combustion products occurs during the build-up of pressure and temperature in the combustion zone. After the coal bed reaches a temperature of about 2000.degree. F and a pressure in the range of about 100-200 psi above pore pressure the airflow is terminated and the outflow of the combustion products from the combustion zone is initiated. The CO.sub.2 containing gaseous products and the water bleed back into the combustion zone to react endothermically with the hot carbon of the combustion zone to produce a burnable gas with a relatively high hydrogen and carbon monoxide content. About 11 to 29 percent of the gas recovered from the combustion zone is carbon monoxide which is considerably better than the 4 to 10 percent carbon monoxide obtained by employing previously known coal gasification techniques.

Inventors:
 [1];  [1]
  1. (Morgantown, WV)
Publication Date:
Research Org.:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
OSTI Identifier:
863214
Patent Number(s):
US 4122897
Assignee:
United States of America as represented by United States (Washington, DC) NETL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
situ; gasification; process; producing; product; gas; enriched; carbon; monoxide; hydrogen; directed; coal; combustion; zone; underground; bed; fed; air; increasing; pressure; increase; temperature; forcing; gases; water; naturally; surrounding; outflow; products; occurs; build-up; reaches; 2000; degree; range; 100-200; psi; pore; airflow; terminated; initiated; containing; gaseous; bleed; react; endothermically; hot; produce; burnable; relatively; content; 11; 29; percent; recovered; considerably; 10; obtained; employing; previously; techniques; percent carbon; monoxide content; underground coal; situ gasification; coal bed; product gases; product gas; combustion products; combustion zone; carbon monoxide; coal gasification; gaseous product; containing gas; gasification process; coal gas; gaseous products; combustion product; pore pressure; situ coal; water natural; hot carbon; oxide content; situ gas; producing product; containing gaseous; /166/48/

Citation Formats

Capp, John P., and Bissett, Larry A. In situ gasification process for producing product gas enriched in carbon monoxide and hydrogen. United States: N. p., 1978. Web.
Capp, John P., & Bissett, Larry A. In situ gasification process for producing product gas enriched in carbon monoxide and hydrogen. United States.
Capp, John P., and Bissett, Larry A. Sun . "In situ gasification process for producing product gas enriched in carbon monoxide and hydrogen". United States. https://www.osti.gov/servlets/purl/863214.
@article{osti_863214,
title = {In situ gasification process for producing product gas enriched in carbon monoxide and hydrogen},
author = {Capp, John P. and Bissett, Larry A.},
abstractNote = {The present invention is directed to an in situ coal gasification process wherein the combustion zone within the underground coal bed is fed with air at increasing pressure to increase pressure and temperature in the combustion zone for forcing product gases and water naturally present in the coal bed into the coal bed surrounding the combustion zone. No outflow of combustion products occurs during the build-up of pressure and temperature in the combustion zone. After the coal bed reaches a temperature of about 2000.degree. F and a pressure in the range of about 100-200 psi above pore pressure the airflow is terminated and the outflow of the combustion products from the combustion zone is initiated. The CO.sub.2 containing gaseous products and the water bleed back into the combustion zone to react endothermically with the hot carbon of the combustion zone to produce a burnable gas with a relatively high hydrogen and carbon monoxide content. About 11 to 29 percent of the gas recovered from the combustion zone is carbon monoxide which is considerably better than the 4 to 10 percent carbon monoxide obtained by employing previously known coal gasification techniques.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {1}
}

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