The explosion accident caused by the spontaneous combustion surface of coal after the coal dust is rolled up by the gas gushing from the goal seriously threatens the safety of coal coal mining. Based on this hazard, self-developed gas explosion equipment is used to detonate the CH₄/coal dust mixture by high-temperature source. The process and mechanism of gas/coal dust explosion induced by coal spontaneous combustion in goaf were simulated, and its risk was evaluated. It is of great significance to understand the initiation mechanism of gas-solid mixture through coal spontaneous combustion in goaf. The results show that the explosion pressure (Pgd), explosion temperature (Tgd), rate of pressure rise ((dP/dt)gd), and explosion index (K) of CH₄/coal dust mixtures are closely related to the temperature of high-temperature source and volatile content. The role of coal dust volatiles in homogeneous and nonhomogeneous reactions was revealed. Combined with three explosion parameters (Pgd, Tgd, K), the most dangerous explosion combination concentration of the selected CH₄/coal dust mixture is (9.5 %, 500 g/m³), (9.5 %, 400 g/m³), and (8.5 %, 500 g/m³) at 1073 K ignition temperature. The involvement of coal dust leads to a lower explosion limit for CH₄/air. The Jiang model has better applicability to the prediction of lower explosion limits for CH₄/coal dust mixtures induced by the high-temperature source surface.

煤粉被目标喷出的瓦斯卷起后，煤的自燃面引发爆炸事故，严重威胁煤矿开采安全。针对这种危害，自主研发的瓦斯爆炸设备采用高温源引爆CH ₄ /煤尘混合物。模拟了采空区煤自燃引起瓦斯/煤尘爆炸的过程和机理，并对其风险进行了评价。了解采空区煤自燃引发气固混合物的机理具有重要意义。结果表明，爆炸压力（Pgd）、爆炸温度（Tgd）、压力上升率（（dP/dt）gd)、CH ₄ /煤尘混合物的爆炸指数( K )与高温源温度和挥发分含量密切相关。揭示了煤尘挥发物在均相和非均相反应中的作用。结合三个爆炸参数（Pgd、Tgd、K），所选CH ₄ /煤尘混合物的最危险爆炸组合浓度为（9.5 %、500 g/m ³）、（9.5 %、400 g/m ³） , 和 (8.5 %, 500 g/m ³ ) 在 1073 K 点火温度下。煤尘的介入导致CH ₄ /空气的爆炸下限。在江模型对高温源表面诱发的CH ₄ /煤尘混合物爆炸下限的预测具有更好的适用性。