Method for underground gasification of coal

Details Method for underground gasification of coal Method for underground gasification of coal

E - Fixed Constructions

21

B

166/36

E21B 43/24 (2006.01) E21B 43/14 (2006.01) E21B 43/247 (2006.01) E21B 43/30 (2006.01) E21F 15/00 (2006.01)

Patent

CA 1093958

A B S T R A C T 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 perferably converging towards one another.

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