Underground Coal Gasification and Combustion by Michael S. Blinderman Alexander Y. Klimenko & Alexander Y. Klimenko

Author:Michael S. Blinderman,Alexander Y. Klimenko & Alexander Y. Klimenko
Language: eng
Format: epub
ISBN: 9780081003244
Publisher: Elsevier Ltd.
Published: 2017-11-27T16:00:00+00:00

(9.13)

Factoring in C the maximum value of the caving zone , the size of the coal pillar for the conditions will be .

During underground coal gasification of coal seams, the coal pillar size that will ensure that the leak integrity of the underground gasifier is maintained is determined not only by the lithostatic pressure but also by the degree of fracturing of coal and rock inside the weathered zone. When calculating the dimensions of coal pillars that protect from gas or injection agent (air) outbursts or leakage from the underground gasifier, the depth and degree of weathering of rock and coal should be factored in such calculations.

The greatest extent of coal gasification in thick, steeply dipping coal seams takes place in the vicinity of the coal seam roof, depending on the degree of weathering of coal, rock-bearing pressure, and process modes of operation. Based on the results of a postgasification verification survey conducted through a shaft driven into the spent gasifier, the fire face is preceded by 12–28 m inside the zone of weathered rock in the roof rock of a coal seam 9–10 m in thickness.

The reactive surface of the coal seam, along which coal is gasified, is sloped toward the roof. The angle made with the horizontal δн changes in the range 65–85 degrees. Based on these data, the correction to the size of coal pillars left as the fire face approaches the zone of weathered rocks is calculated from the formula

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