Experimental and Simulation Study on the Explosion of a Coal/Methane Mixed System

This study investigates the microscale suppression mechanisms of four powder explosion suppressants on coal dust/methane (CH4) mixed system explosions. Combining experimental and numerical simulation methods, we explore the gas-phase reaction processes and the role of free radicals in the explosion suppression. Results show that all suppressants reduce the maximum explosion pressure and pressure rise rate, with MPP being the most effective, reducing pressure by 38%. Suppressants inhibit explosions through physical (heat absorption) and chemical (free-radical consumption) mechanisms. Phosphorus-containing intermediates from NH4H2PO4 and MPP react with free radicals, while NaHCO3 and MCA decompose to produce inert gases and consume O• and H• radicals. This work provides a theoretical foundation for optimizing explosion suppressants in mining safety applications.本研究针对四种粉体抑爆剂对煤尘/甲烷（CH₄）混合体系爆炸的微观抑爆机制展开探究。本研究结合实验与数值模拟方法，深入剖析气相反应过程以及自由基在抑爆过程中的作用机制。研究结果表明，所有抑爆剂均可降低爆炸最大压力与压力上升速率，其中MPP抑爆效果最为显著，可使压力降幅达38%。抑爆剂通过物理（吸热）与化学（消耗自由基）两种机制实现爆炸抑制：磷酸二氢铵（NH₄H₂PO₄）与MPP分解产生的含磷中间体可与自由基发生反应，而碳酸氢钠（NaHCO₃）与MCA则通过分解释放惰性气体并消耗O•、H•自由基。本研究可为矿山安全领域中抑爆剂的优化应用提供理论依据。