Coal is a crucial energy source globally, but it poses environmental challenges due to high temperatures and harmful missions during combustion. This study investigates bituminous coal's oxidation combustion in low-oxygen environments using thermogravimetry and differential thermogravimetry tests. We explore the thermal behavior and kinetic properties of three coal samples during combustion. Our findings reveal that, as oxygen concentration decreases, the combined combustion index of the coal samples also decreases during the oxygen-absorption stage. Additionally, the apparent activation energy of coal increases with its conversion rate (temperature). We observe a shift in the reaction mechanism from three-dimensional dissipation mode to two-dimensional as the oxygen concentration decreases. Notably, the activation energy initially rises and then decreases with increasing conversion (temperature) during the pyrolysis combustion stage, with a shortened phase of increased activation energy at lower oxygen concentrations. Furthermore, the kinetic mechanism transitions from stochastic nucleation and growth to one-dimensional phase-boundary mode with decreasing oxygen concentration. These insights enhance our understanding of coal oxidation combustion in low-oxygen environments, contributing to strategies for mitigating coal spontaneous combustion.

煤炭是全球重要的能源，但由于燃烧过程中的高温和有害作用，它给环境带来了挑战。本研究利用热重分析和差示热重分析测试研究了烟煤在低氧环境中的氧化燃烧。我们探索了三种煤样在燃烧过程中的热行为和动力学特性。我们的研究结果表明，随着氧气浓度的降低，煤样在吸氧阶段的综合燃烧指数也会降低。此外，煤的表观活化能随着其转化率（温度）的增加而增加。我们观察到随着氧浓度的降低，反应机制从三维耗散模式转变为二维。值得注意的是，在热解燃烧阶段，随着转化率（温度）的增加，活化能首先上升，然后下降，在较低的氧气浓度下，活化能增加的阶段缩短。此外，随着氧浓度的降低，动力学机制从随机成核和生长转变为一维相界模式。这些见解增强了我们对低氧环境中煤炭氧化燃烧的理解，有助于制定减轻煤炭自燃的策略。