基于大尺寸隔热氧化试验的银洞沟煤矿110201工作面煤自燃特性研究

为了准确研究银洞沟煤矿2^#煤层110201工作面煤自燃特性,采用大尺度煤隔热氧化装置模拟煤自然发火过程中煤体温度变化,确定煤层最短发火期,研究煤氧化过程中的耗氧率、气体产生规律,最终确定该煤层临界温度和标志性气体。结果表明:2^#煤层煤最短发火期为37 d;煤自热氧化分为2个阶段,煤体温度缓慢上升阶段和煤氧化加速阶段,在第2阶段,O₂消耗率、CO生成速率加快,并出现C2H4,从而确定该工作面临界温度为101.6℃,C₂H₄为主要标志气体,CO相对量变化趋势为辅助标志指标。通过大尺度煤隔热氧化实验优选的临界值和标志气体能更加准确地反应煤的自然发火和产气规律,对煤自燃的早期预测预报更加准确。

Study on Coal Spontaneous Combustion Characteristics of 110201 Working Face in Yindonggou Coal Mine Based on Large-scale Thermal Insulation Oxidation Test

In order to accurately study the spontaneous combustion characteristics of coal in 110201 working face of No.2 coal seam in Yindonggou coal mine,large-scale coal thermal insulation oxidation device was used to simulate the temperature change of coal body in the process of coal spontaneous combustion,determine the shortest ignition period of coal seam,study the oxygen consumption rate and gas generation law in the process of coal oxidation,and finally determine the critical temperature and landmark gas of the coal seam.The results show that:the shortest ignition period of No.2 coal seam is 37 days;the coal autothermal oxidation is divided into two stages,the coal body temperature rises slowly and the coal oxidation accelerates.In the second stage,O₂ consumption rate and co generation rate increase,and C₂H₄ appears.Therefore,the working face boundary temperature is 101.6℃,C₂H₄ is the main indicator gas,and the change trend of CO relative quantity is the auxiliary indicator.Through the large-scale coal thermal insulation oxidation experiment,the optimized critical value and marker gas can reflect the spontaneous combustion and gas production law of coal more accurately,and the early prediction and prediction of coal spontaneous combustion is more accurate.