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<p>Waterlogged residual coal in mined-out areas is more prone to spontaneous combustion, with its oxidation process jointly regulated by ambient oxygen concentration and the dryness of the coal sample. This investigation systematically investigated the oxidation kinetics of waterlogged coal under varying oxygen concentrations using TG-DSC-FTIR technology. Experimental results indicate that elevated oxygen concentrations markedly reduce the characteristic temperatures (T1–T7) of coal samples, causing TG-DTG curves to shift toward lower temperatures and intensifying the intensity of coal-oxygen composite reactions. Drying duration exhibits a nonlinear regulatory effect: undried coal exhibits the highest oxidation activity due to oxygen diffusion facilitated by pore channels formed by evaporating moisture, while coal dried for 3 h shows the lowest reactivity owing to the synergistic inhibitory effect of moisture and pore structure. Kinetics analysis revealed that during model-free fitting, the oxygen absorption and gravimetric (OAG) and Combustion Pyrolysis (CP) stages exhibited highest fit quality with the KAS and Friedman methods, respectively. Activation energy calculations indicated that a 5% increase in oxygen concentration reduced apparent activation energy by 8.3–15.7&#xa0;kJ&#xa0;mol<sup>−1</sup>. Undried coal exhibited activation energies 12–22% higher than dried coal during the OAG stage, yet 18–30% lower during the CP stage. These findings elucidate the synergistic mechanism of oxygen concentration and moisture content in coal spontaneous combustion kinetics, providing theoretical foundations for preventing spontaneous combustion in water-saturated coal zones within deep mines.</p>

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Study on the difference in oxidation kinetic characteristics of water-soaked coal driven by environmental oxygen concentration

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Luyao Wang,
  • Haiyan Wang,
  • Sheng Xue,
  • Huiyong Niu,
  • Bo Tan,
  • Zhuangzhuang Shao,
  • Yikang Liu,
  • Gongda Wang,
  • Fengshi Liu

摘要

Waterlogged residual coal in mined-out areas is more prone to spontaneous combustion, with its oxidation process jointly regulated by ambient oxygen concentration and the dryness of the coal sample. This investigation systematically investigated the oxidation kinetics of waterlogged coal under varying oxygen concentrations using TG-DSC-FTIR technology. Experimental results indicate that elevated oxygen concentrations markedly reduce the characteristic temperatures (T1–T7) of coal samples, causing TG-DTG curves to shift toward lower temperatures and intensifying the intensity of coal-oxygen composite reactions. Drying duration exhibits a nonlinear regulatory effect: undried coal exhibits the highest oxidation activity due to oxygen diffusion facilitated by pore channels formed by evaporating moisture, while coal dried for 3 h shows the lowest reactivity owing to the synergistic inhibitory effect of moisture and pore structure. Kinetics analysis revealed that during model-free fitting, the oxygen absorption and gravimetric (OAG) and Combustion Pyrolysis (CP) stages exhibited highest fit quality with the KAS and Friedman methods, respectively. Activation energy calculations indicated that a 5% increase in oxygen concentration reduced apparent activation energy by 8.3–15.7 kJ mol−1. Undried coal exhibited activation energies 12–22% higher than dried coal during the OAG stage, yet 18–30% lower during the CP stage. These findings elucidate the synergistic mechanism of oxygen concentration and moisture content in coal spontaneous combustion kinetics, providing theoretical foundations for preventing spontaneous combustion in water-saturated coal zones within deep mines.