| 摘要 |
PCT No. PCT/NL91/00027 Sec. 371 Date Aug. 6, 1992 Sec. 102(e) Date Aug. 6, 1992 PCT Filed Feb. 18, 1991 PCT Pub. No. WO91/13236 PCT Pub. Date Sep. 5, 1991.A method for underground gasification of coal or browncoal in an inclined coal seam, 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 the front in an upward direction through the coal seam. The gases for maintaining the gasification are introduced through a first borehole and the combustion gases being discharged through a second borehole. The first of these boreholes is used for introducing the filler and this borehole following the coal seam, preferably in a more or less horizontal direction. The other borehole being connected in the coal seam at to the lower end of the first borehole.
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