Coal gasification method
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United States of America Patent
Stats
-
Jan 6, 1981
Grant Date -
N/A
app pub date -
Sep 1, 1978
filing date -
Sep 16, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for underground gasification of coal or brown coal, in which a substantially uniform gasification or combustion front is maintained by filling the cavity generated by gasification of coal with a filler so as to drive said front in an upward direction through the coal layer, the gases for maintaining the gasification being introduced through a first borehole and the combustion gases being discharged through a second borehole, one of these boreholes being used for introducing the filler, said boreholes extending at an inclination corresponding to the general inclination of the coal layer, and preferably converging towards one another.
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