| With the development and exploitation of coal production intensity increases, especially in high-efficiency or caving mining face of applications, from goaf spontaneous combustion and gas two major disasters become more prominent. According to the site, laboratory tests and fluid mechanics, multi-component gas diffusion and heat and mass transfer and other theories, the establishment of Gob and gas coupling mathematical model and numerical simulation carried out using G3Software gob flow field. Daxing Coal Mine N2-706igneous rock samples and normal coal samples at room temperature oxidation state of nature to do a long track comparative experiments, igneous coal oxidation of coal samples with normal close, Daxing coal mine7due to the intrusion of igneous lead spontaneous combustion of coal oxidation activity was enhanced; Daxing coal mine N2-706igneous rock samples at different heating rates thermal gravimetric analysis, the fast heating rate of coal, dehydration activation energy, activation energy ignition and combustion are the activation energy reduced, which will make more spontaneous combustion of coal.7coal seam gas emission is high, improve gas pre-drainage, further reducing gas emission during mining, ground pressure and reduce the impact of coal and gas outburst, but also increases the risk of spontaneous combustion in goaf sex; simulations show, high gas storage capacity gob gob upper and lower ends of the distribution of oxygen concentration tends to balance, because gas floating, high gas channel drainage conditions, into the mined area, gas concentration at both ends of the return air distribution of non-equilibrium, the greater the flow, the greater the difference the upper and lower non-equilibrium. Two kinds of gas and fire hazards in the mechanism of the coupling effects, depending on the working face gob air leakage level in the work-oriented gob air leakage rate is low, gas for the ability to inhibit spontaneous oxidation will also be revealed. |
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