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基于斌郎煤矿401采区瓦斯地质情况,参照相关规范计算并预测了采区瓦斯储量和瓦斯涌出量,预测值分别为15.08 Mm3和7.84 m3/min,以此为依据初步分析确定了该采区抽采瓦斯的必要性与可行性。为进一步掌握煤层预抽瓦斯的可行性,在401采区北端沿内连煤层掘进1条长度为309 m的瓦斯专用巷道。通过在±0西北大巷实施穿层钻孔和在采区内连煤层掘煤巷道实施顺层钻孔2种钻采方式,进行了采区瓦斯预抽试验。试验共实施了6个穿层孔和6个顺层孔,临孔间距分别为6 m和5 m,测得12个孔的平均单孔瓦斯流量和平均瓦斯体积分数分别为0.091 m3/min和47%,获得了较好的瓦斯预抽效果。综合分析采区瓦斯主要参数的预测结果和瓦斯预抽试验数据,提出了“以首先开采外连煤层并同时抽采内连煤层的卸压瓦斯为主,必要时预先抽采煤层瓦斯和围岩裂隙中瓦斯”的采区瓦斯治理方案和将U型通风变更为Y型通风的建议。参考相似矿井的瓦斯利用经验对瓦斯发电的投入及产出进行了预算和评估,将发电机功率初步确定为500 kW。
Based on gas geological conditions in No.410 mining area of Bin Lang Coal Mine, gas reserves and gas emission of the mining area are calculated and predicted with reference to the relevant specifications, with predicted values of 15.08 Mm3 and 7.84 m3 / min, respectively Necessity and feasibility of gas drainage in the district. In order to further understand the feasibility of pre-pumping coal seam, a tunnel with a length of 309 m was drilled along the inner coal seam at the northern end of the 401 mining area. The gas pre-pumping test was carried out through two drilling methods: stratified hole drilling in the northwest ± ± 0 lane and seam drilling in the coal seam with coal seam in the mining area. The experiment carried out a total of 6 through holes and 6 bedding holes with inter-hole spacing of 6 m and 5 m respectively. The average single-hole gas flow rate and average gas volume fraction of 12 holes were measured to be 0.091 m3 / min and 47%, get a better gas pre-pumping effect. Based on the comprehensive analysis of the prediction results of the main parameters of gas in the mining area and the gas pre-pumping test data, it is proposed that “the first step is to exploit the pressure-relief gas with the coal seam connected to the coal seam and the coal seam in the same time, and if necessary, Gas control measures in the mining area surrounding rock fissure ”and the proposal to change U-type ventilation to Y-type ventilation. With reference to the gas utilization experience of similar mines, the input and output of gas power generation are estimated and evaluated, and the generator power is initially determined to be 500 kW.