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| Research and application of influence of low- temperature nitrogen on spontaneous combustion in goaf of withdrawal working face |
| Wang Lei |
| National Energy Group Xinjiang Energy Co., Ltd., Urumqi 830011, China |
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Abstract Wudong coal mine low metamorphic spontaneous combustion coal seam in fully mechanized top coal caving face end mining withdrawal stage, due to the withdrawal period is long, goaf air leakage oxygen supply and other factors, goaf prone to spontaneous combustion. By injecting low temperature nitrogen into the goaf of the working face, the three zones of the goaf are narrowed and moved forward to the support. The average temperature of the goaf is reduced from 28℃ to 5 ~ 10℃ , and the CO concentration is stable below 10 ppm. The spontaneous combustion of residual coal in the goaf is effectively prevented and controlled, and the safe withdrawal of the working face is ensured.
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