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Publication numberWO1996028637 A1
Publication typeApplication
Application numberPCT/CN1995/000050
Publication date19 Sep 1996
Filing date14 Jun 1995
Priority date14 Mar 1995
Also published asCN1062329C, CN1183507A
Publication numberPCT/1995/50, PCT/CN/1995/000050, PCT/CN/1995/00050, PCT/CN/95/000050, PCT/CN/95/00050, PCT/CN1995/000050, PCT/CN1995/00050, PCT/CN1995000050, PCT/CN199500050, PCT/CN95/000050, PCT/CN95/00050, PCT/CN95000050, PCT/CN9500050, WO 1996/028637 A1, WO 1996028637 A1, WO 1996028637A1, WO 9628637 A1, WO 9628637A1, WO-A1-1996028637, WO-A1-9628637, WO1996/028637A1, WO1996028637 A1, WO1996028637A1, WO9628637 A1, WO9628637A1
InventorsLi Yu, Jie Liang, Weilian Zhang, Feng Yu
ApplicantChina University Of Mining And Technology
Export CitationBiBTeX, EndNote, RefMan
External Links: Patentscope, Espacenet
A two-stage of method for gasificating undergrounds coal in situ
WO 1996028637 A1
Abstract
It includes injection holes, a production hole and a gasification stove built up underground, into which the suppressed air is conveyed in the first stage, and in the second stage the steam is blasted, while coal gas including CO and CO2 is withdrawn. The two stages are in cycle, the second starts up when CO and CO2 content of lower-calorific coal gas is more than 26 %, and then first stage begins when CO content of high-calorific watercoal gas is less than 5 %.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
SU1726739A1 * Title not available
US429285 *24 Dec 18893 Jun 1890 Artificial tooth
US3734184 *18 Jun 197122 May 1973Cities Service Oil CoMethod of in situ coal gasification
US4026357 *26 Jun 197431 May 1977Texaco Exploration Canada Ltd.In situ gasification of solid hydrocarbon materials in a subterranean formation
US4296809 *21 Jul 198027 Oct 1981Gulf Research & Development CompanyIn situ gasification of bituminous coal
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US942897828 Jun 201230 Aug 2016Carbon Energy LimitedMethod for shortening an injection pipe for underground coal gasification
US943518428 Jun 20126 Sep 2016Carbon Energy LimitedSacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification
Classifications
International ClassificationE21B43/243
Cooperative ClassificationE21B43/243
European ClassificationE21B43/243
Legal Events
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19 Sep 1996ALDesignated countries for regional patents
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