白龙山煤矿10201工作面合理挡风帘长度确定

针对白龙山煤矿10201工作面漏风严重和上隅角瓦斯浓度偏高的问题,利用Fluent软件对进风侧不同挡风帘长度下工作面风量和瓦斯浓度、采空区瓦斯分布和自燃氧化带的变化规律进行了数值模拟研究,结果表明:在工作面距进风巷0~80 m范围内,随着挡风帘长度增加,工作面风量逐渐增加;在工作面距进风巷0~190 m范围内,随着挡风帘长度增加,工作面瓦斯浓度逐渐下降;挡风帘可降低采空区回风侧浅部和中部的瓦斯浓度,而对于采空区进风侧和回风侧深部区域,挡风帘会使瓦斯浓度有所上升;在进风侧设置挡风帘会使采空区进风侧自燃氧化带宽度变大、采空区回风侧自燃氧化带宽度减小,且随着挡风帘长度增加,采空区进风侧自燃氧化带逐渐向工作面靠近。根据数值模拟结果,确定合理挡风帘长度为5 m,应用结果表明:挂帘后工作面有效风量增加,瓦斯体积分数平均值为0.521%,降幅达13.5%,一氧化碳体积分数平均值为2.26%,降幅为8.1%,降低了上隅角瓦斯超限和采空区自然发火的危险性。

Determination of reasonable length of wind-blocking curtain in 10201 working face of Bailongshan Coal Mine

In order to solve the problems of serious air leakage and high gas concentration in the upper corner of 10201 working face of Bailongshan coal mine,Fluent software based numerical simulation studies are carried out to obtain the change law of working face air volume and gas concentration,the change law of gas distribution and spontaneous combustion oxidation zone in the air inlet side with different lengths of wind-blocking curtains.The results showed that in the range of 0-80 m from the working face to the inlet lane,the air volume of the working face gradually increase.In the range of 0-190 m from the working face to the inlet lane,the gas concentration of the working face gradually decreases with the increase of the length of the wind-blocking curtain.The wind-blocking curtain can reduce the gas concentration in the shallow and central part of the return side of the mining area.But for the deep part of the inlet side and return side of the mining area,the wind-blocking curtain will increase the gas concentration.The installation of the wind-blocking curtain on the inlet side is able to increase the width of the spontaneous oxidation zone on the inlet side of the mining area,reduce the width of the spontaneous oxidation zone on the return side of the mining area.As the length of the windshield increases,the spontaneous combustion oxidation zone on the inlet side of the mining area gradually approaches the working face.The numerical simulation results show that the reasonable length of wind-blocking curtain is 5 m.The application results show that after the curtain installation,the effective air volume of the working face increases,the average gas volume fraction is 0.521%with a decrease of 13.5%,the average carbon monoxide volume fraction is 2.26%with the decrease of 8.1%,and the risk of gas overrun in the upper corner and spontaneous fire in the mining area is reduced.