Abstract
In this article the experimental conditions and process of the underground gasification in the Woniushan Mine, Xuzhou, Jiangsu Province are introduced, and the experimental results are analyzed. By adopting the new method of long-channel, big-section, and two-stage underground coal gasification, the daily gas production reaches about 36,000 m3, with the maximum output of 103,700 m3. The daily average heating value of air gas is 5.04 MJ/m3, with 13.57 MJ/m3 for water gas. In combustible compositions of water gas, H2 contents stand at over 50%, with both CO and CH4 contents over 6%. Experimental results show that the counter gasification can form new temperature conditions and increase the gasification efficiency of coal seams.
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