Subterranean gasification of bituminous coal
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United States of America Patent
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Feb 2, 1982
Grant Date -
N/A
app pub date -
Jul 21, 1980
filing date -
Jul 21, 1980
priority date (Note) -
Expired
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Abstract
In the underground gasification of a swelling coal the high gas-flow link between the injection and the production wells needed for the gasification process is produced by reverse combustion using air heated to a temperature below the softening point of the coal. The heated air pretreats and conditions the coal proximate to the link under formation by increasing its permeability and reducing its swelling properties. Improved combustion and suppression of plugging results in the subsequent gasification stage.
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