“三软”煤层综放工作面自然发火防治技术研究

Study on Prevention and Control Technology for Coal Spontaneous Combustion in Fully Mechanized Top- coal Caving Face in “Three- soft”Coal Seam

分析了"三软"煤层综放工作面自然发火的特点,提出了预防综放工作面自然发火的技术措施,并在宝鸡秦源煤矿N101综放工作面火区治理中进行了实践应用。实践结果表明,采用该防灭火技术措施后,在封闭灭火期间,38#支架后部的采空区(火区CO浓度最高点和温度最高点)的CO浓度,由5.8×10-4逐步降至5.0×10-6,说明所采取的灭火措施收到了良好的效果。该技术措施最终成功扑灭了N101综放工作面自燃火灾,并撤出了被封闭数月的液压支架等综采设备。

In this paper, analysis was made on the characteristics of coal spontaneous combustion in fully mechanized top-coal caving face in“three-soft” coal seam, and the preventive measures against coal spontaneous combustion were proposed and applied for the prevention and control of the spontaneous fire zone in N101 fully mechanized top-coal caving face of Baoji Qinyuan Mine. The application results showed that during the enclosure of the spontaneous fire zone, the CO concentration in the gob behind No. 38 support （ the point where the highest CO concentration and temperature appeared in the whole fore zone） gradually reduced from 5. 8＆#237;10-4 to 5. 0＆#237;10-6 after taking the fire preventive and extinguishing measures, this indicated the good effect of the fire-fighting measures. Using this fire-fighting technology, the spontaneous fire in N101 fully mechanized top-coal caving face was successfully put out, and the fully mechanized equipment such as hydraulic powered supports which were enclosed in the face for several months was finally withdrawn.