Research on coupling hazard mechanism of mine gas and coal fire for a gassy and high spontaneous combustion propensity coal seamChinese Full Text
YANG Sheng-qiang;QIN Yi;SUN Jia-wei;JIANG Chun-lin;LUN Jia-yun;State Key Laboratory of Coal Recourse and Safe Mining,China University of Mining ＆ Technology;Faulty of Safety Engineering,China University of Mining ＆ Technology;Key Laboratory of Gas and Fire Control for Coal Mines,China University of Mining＆ Technology;
Abstract: In order to resolve the key safety problems existed in the coal extraction in a gassy and high spontaneous combustion propensity coal seam,based on the mining condition in Shigang Mine in Yangquan coal field,this paper studied on the coupling hazard mechanism of mine gas and coal fire for a gassy and high spontaneous combustion propensity coal seam by combining usages of experimental investigations,theoretical analysis and on-site measurements.The results show that under the conditions of air flow with various mine gas concentrations,the oxidation products show the "stagnancy effect"in general; and the "inhibitory effect"of oxidation products is taken place as increasing the CH4concentration can be observed when given the isothermal conditions. The stereoscopic gas drainage plan can change the air leakage pattern in the mine gob which also results in varying the widths of coal spontaneous combustion"three-zone". Meantime,by combing using the analyses of CO concentrations both in high-level drainage roadway and in tailgate road to predict the spontaneous combustion in the"three-zone",two distinguished stages can be identified.The ration of 0. 221 of oxygen to nitrogen can be used to be divided thermal zone for high gas and combustible goaf,spontaneous combustion zone with oxygen concentration of 5% can still be used to be divided.
Keywords：
high gas and combustible coal seam; stagnancy effect; inhibitory effect; spontaneous combustion predic-tion; spontaneous combustion "three-zone";
- DOI：
10.13225/j.cnki.jccs.2013.1013
- Series：
- Subject：
- Classification Code：
TD752.2
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