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对阳煤集团3个矿近年来12个回采面不同配风量,矿井主要通风机不同运行状态时的卸压瓦斯抽采数据进行统计分析发现:回采面卸压瓦斯抽采率与配风量成反比。当瓦斯抽采系统能力确定后,加大工作面配风量会使瓦斯抽采率降低;而增加风排瓦斯量,甚至会使上隅角、回风流及瓦斯排放巷的瓦斯浓度升高,与期望目标相背离;采空区卸压瓦斯在其体积浮力和通风流场的共同作用下不断向垮落带顶部的“O”形圈通道的回风侧区域运移,形成卸压瓦斯抽采的最佳区域;强化瓦斯抽采是保障安全高效生产的关键。
The statistical analysis of the pressure relief gas drainage data of 12 coal mining facets in 3 coal mines of Yangquan Coal Mine in recent years shows that the rate of relief gas drainage in the mining face is inversely proportional to the gas distribution rate . When the capacity of gas drainage system is determined, increasing gas distribution on the working face will reduce the gas drainage rate; while increasing the gas drainage capacity may even increase the gas concentration in the upper corner, return air flow and gas discharge lane, and The goal is deviated from the goal; the pressure relief gas in goaf continuously migrates to the return air-side region of the “O” -shaped ring channel at the top of the caving zone under the combined effect of volume buoyancy and ventilation flow field to form pressure relief gas Pumping the best area; strengthen gas extraction is to ensure the safe and efficient production of the key.