巨厚煤层煤自燃综合防治方法研究

Study on Comprehensive Prevention and Control Method of Coal Spontaneous Combustion in Huge Thick Seam

文章首先分析了巨厚煤层放顶煤综放开采过程中存在的煤自燃防治的难点,通过实验测试了龙王沟煤矿61601首采工作面的煤自燃指标气体的变化规律,为工作面煤自燃的预测预报提供科学依据。其后,针对工作面遗煤量多,堆积厚度大的问题,提出并实施了高位打钻注浆与低位预埋管路灌注普瑞特防灭火材料的方法,防灭火材料采用氮气发泡,一方面提高了扩散效果,另一方面氮气释放后惰化采空区。该技术方案有效防治了采空区煤自燃,保证了工作面安全回采,为后续工作面的开采提供了宝贵的经验。

Firstly, the paper analyses the difficulties of preventing and controlling coal spontaneous combus-tion in the process of fully mechanized top coal caving mining in huge thick coal seam, and tests the change law of index gas of coal spontaneous combustion in 61601 first mining face of Long Wang Gou Coal Mine by experiment, which provides scientific basis for prediction of coal spontaneous combustion in working face. Thereafter, aiming at the problem of large amount of coal left behind and large accumulation thickness in the working face, the methods of high drilling grouting and low pre-buried pipeline filling with Pratt fire-fighting materials were put forward and implemented. Nitrogen foaming is used to prevent and extinguish fire. On the one hand, it improves the diffusion effect, on the other hand, it makes the goaf inert after the release of nitrogen. The technical scheme has effectively prevented the spontaneous combustion of coal in goaf, ensured the safe mining of working face, and provided valuable experience for the follow-up mining of working face.