大采高综采工作面采空区煤自燃危险区域研究与判定

Research and Judgment of Coal Spontaneous Combustion Dangerous Area in Goaf of Fully Mechanized Mining Face with Large Mining Height

大采高工作面由于围岩压力大、回采速度慢和漏风量大等特点造成煤自燃火灾防治难度较大。因此,采用数值模拟和现场观测相结合的方式研究了梅花井232204大采高工作面煤自燃危险区域分布特征。结果表明:采空区漏风风流从进风巷向回风巷方向渗流,造成氧气浓度在进风侧比较高,且高氧气浓度的范围大,在回风侧氧气浓度相对较低,高氧气浓度的范围也显著缩小。随埋入采空区距离增大氧气浓度逐渐降低,进回风侧氧气浓度分别在105 m和80 m降低到8%。综合判定得到232204工作面采空区的氧化升温带范围在进风区域和回风区域分别为40~105 m和28~80 m。研究结果可为大采高综采工作面采空区防灭火工作提供指导。

The large mining height working face has the characteristics of high surrounding rock pressure,slow working face mining speed and large air leakage,which makes the prevention and control of coal spontaneous combustion fire more difficult.The distribution characteristics of coal spontaneous combustion risk area in Meihuajing 232204 working face with large mining height were studied by combining numerical simulation and field observation.The results show that the leakage air flow in the goaf seeps from the air inlet to the return airway,resulting in a relatively high oxygen concentration on the air inlet side,and the range of high oxygen concentration is large,while on the return air side,the oxygen concentration is relatively low,and the high oxygen concentration.The range is also significantly reduced.With the increase of the distance of the buried goaf,the oxygen concentration gradually decreased,and the oxygen concentration in the inlet and outlet wind measurements decreased to 8%at 105 m and 80 m,respectively.According to the comprehensive judgment,the scope of the oxidation heating zone in the goaf of the 232204 working face is 40-105 m and 28-80 m in the air inlet area and the return air area,respectively.The research results can provide guidance for fire prevention and fire fighting in goaf of fully mechanized mining face with large mining height.