Spontaneous combustion index system of 2-1 coal seam in Hulusu Coal Mine
In order to study the 2-1coal seam's spontaneous combustion index system in Hulusu coal mine,the natural igni-tion signature gas and critical value of coal in the goaf of different oxygen concentration on the 21404 working face of Hulusu coal mine are investigated,and the law of gas production and the heating law of the coal sample are analyzed;The results show that when the coal temperature exceeds 70～80 ℃,CO production rate,oxygen consumption speed and heating rate are accelerated,Therefore,it is concluded that the critical temperature of 2-1coal is 70～80 ℃;When the coal temperature ex-ceeds 100～110 ℃,oxygen consumption speed,and gas production rates,such as CO and CH4,are increased drastically.Therefore,it is concluded that the dry crack temperature of 2-1 coal is 100～110 ℃;We determine the index gases of the coal natural fire early warning system,including CO,C2H4 and C2H2.According to the generating rules of CO,C2H4,C2H2,the signature gas and critical value of natural ignition in 2-1 coal seam are CO＜30 × 10-6,CO ≥30 × 10-6～80 × 10 6,C2H4＞0 and C2H2＞0.The results have guiding significance for the early warning and prevention of 2-1 coal seam fire in Hulusu coal mine.
coal spontaneous combustionoxygen concen-trationsignature gascritical value
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