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Title: Cyclic flow underground coal gasification process

Abstract

The present invention is directed to a method of in situ coal gasification for providing the product gas with an enriched concentration of carbon monoxide. The method is practiced by establishing a pair of combustion zones in spaced-apart boreholes within a subterranean coal bed and then cyclically terminating the combustion in the first of the two zones to establish a forward burn in the coal bed so that while an exothermic reaction is occurring in the second combustion zone to provide CO.sub.2 -laden product gas, an endothermic CO-forming reaction is occurring in the first combustion zone between the CO.sub.2 -laden gas percolating thereinto and the hot carbon in the wall defining the first combustion zone to increase the concentration of CO in the product gas. When the endothermic reaction slows to a selected activity the roles of the combustion zones are reversed by re-establishing an exothermic combustion reaction in the first zone and terminating the combustion in the second zone.

Inventors:
 [1]
  1. Morgantown, WV
Issue Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
OSTI Identifier:
862997
Patent Number(s):
4069867
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
cyclic; flow; underground; coal; gasification; process; directed; method; situ; providing; product; gas; enriched; concentration; carbon; monoxide; practiced; establishing; pair; combustion; zones; spaced-apart; boreholes; subterranean; bed; cyclically; terminating; establish; forward; burn; exothermic; reaction; occurring; zone; provide; -laden; endothermic; co-forming; percolating; thereinto; hot; wall; defining; increase; slows; selected; activity; roles; reversed; re-establishing; endothermic reaction; underground coal; coal bed; exothermic reaction; product gas; combustion zone; carbon monoxide; coal gasification; gasification process; coal gas; combustion zones; wall defining; subterranean coal; situ coal; hot carbon; /166/299/

Citation Formats

Bissett, Larry A. Cyclic flow underground coal gasification process. United States: N. p., 1978. Web.
Bissett, Larry A. Cyclic flow underground coal gasification process. United States.
Bissett, Larry A. Sun . "Cyclic flow underground coal gasification process". United States. https://www.osti.gov/servlets/purl/862997.
@article{osti_862997,
title = {Cyclic flow underground coal gasification process},
author = {Bissett, Larry A},
abstractNote = {The present invention is directed to a method of in situ coal gasification for providing the product gas with an enriched concentration of carbon monoxide. The method is practiced by establishing a pair of combustion zones in spaced-apart boreholes within a subterranean coal bed and then cyclically terminating the combustion in the first of the two zones to establish a forward burn in the coal bed so that while an exothermic reaction is occurring in the second combustion zone to provide CO.sub.2 -laden product gas, an endothermic CO-forming reaction is occurring in the first combustion zone between the CO.sub.2 -laden gas percolating thereinto and the hot carbon in the wall defining the first combustion zone to increase the concentration of CO in the product gas. When the endothermic reaction slows to a selected activity the roles of the combustion zones are reversed by re-establishing an exothermic combustion reaction in the first zone and terminating the combustion in the second zone.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {1}
}

Patent:

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