Abstract Once the methane concentration reaches the explosion limit, it may be ignited by coal fires in methane-rich and coal combustion-prone longwall mining gobs. Therefore, the methane migration in the area of spontaneous combustion of coal is important for evaluating the safety risk and revealing the formation mechanism of methane explosions. A self-designed experimental platform of a longwall gob was applied to investigate the methane migration process induced by the spontaneous combustion of coal. The effect of temperature, and range of coal spontaneous combustion on the methane distribution was studied, and the potential area subject to a methane explosion was identified and calculated quantitatively. Furthermore, the methane movement near the area of spontaneously combusting coal was analyzed, and the mechanism of methane accumulation was proposed. The results illustrate that the changes in the temperature and the range of spontaneous combustion of coal affect the migration of the methane concentration in the gobs.

中文翻译：

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长壁采空区煤自燃引起甲烷运移的实验研究

摘要 一旦甲烷浓度达到爆炸极限，在富含甲烷且易燃烧的长壁采空区中可能会被煤火点燃。因此，煤自燃区甲烷迁移对于评估安全风险和揭示甲烷爆炸形成机理具有重要意义。应用自行设计的长壁采空区实验平台研究煤自燃引起的甲烷运移过程。研究了温度、煤自燃范围对甲烷分布的影响，确定并定量计算了可能发生甲烷爆炸的区域。此外，分析了自燃煤区域附近的甲烷运动，并提出了甲烷积累的机理。结果表明，煤自燃温度和范围的变化会影响采空区中甲烷浓度的迁移。