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<p>Because low-rank coal is more susceptible to coal spontaneous combustion (CSC) than high-rank coal, this research revolved around three representative low-rank coals and delved into their thermodynamic characteristics, surface morphology, internal pore structure, and functional group evolution during oxidation. The findings manifested a negative correlation between CSC and coal metamorphism. More precisely, lower metamorphic grade diminished characteristic temperatures during rapid oxidation, along with more drastic exothermic process that shifted toward lower-temperature range. The thermal stability of surface morphology was augmented with ascending metamorphic degree, and the three coals embodied dramatic developmental characteristics at 150&#xa0;°C, 210&#xa0;°C and 350&#xa0;°C. According to the analysis of internal pore structure, porosity and pore throat distribution had a negative correlation between with metamorphic degree. In contrast, the stability of pore structure and pore throat with temperature sustained a positive correlation with metamorphic degree. Metamorphic degree had a negligible correlation with the evolution of main functional groups, whereas evident metamorphism-dependent alterations were observed in their transition characteristics, and transition temperature, in particular, escalated as metamorphic degree rose. Moreover, Pearson and Gray correlation analyses corroborated hydroxyl, aliphatic hydrocarbons, and carbonyl groups as key functional groups governing heat release. This study lays a theoretical basis for elucidating the mechanism of CSC of low-rank coal and formulating targeted preventive measures. Furthermore, the results deliver pivotal guidance for safely exploiting coal resources as well as alleviating losses associated with spontaneous combustion disasters.</p>

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Thermodynamic Analysis and Dynamic Evolution of Microscopic Physicochemical Properties During the Oxidation Process of Low-Rank Coal

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Linhao Xie,
  • Hongqing Zhu,
  • Rui Li,
  • Lei Zhang,
  • Qi Yuan,
  • Tianyu Li,
  • Houwang Wang

摘要

Because low-rank coal is more susceptible to coal spontaneous combustion (CSC) than high-rank coal, this research revolved around three representative low-rank coals and delved into their thermodynamic characteristics, surface morphology, internal pore structure, and functional group evolution during oxidation. The findings manifested a negative correlation between CSC and coal metamorphism. More precisely, lower metamorphic grade diminished characteristic temperatures during rapid oxidation, along with more drastic exothermic process that shifted toward lower-temperature range. The thermal stability of surface morphology was augmented with ascending metamorphic degree, and the three coals embodied dramatic developmental characteristics at 150 °C, 210 °C and 350 °C. According to the analysis of internal pore structure, porosity and pore throat distribution had a negative correlation between with metamorphic degree. In contrast, the stability of pore structure and pore throat with temperature sustained a positive correlation with metamorphic degree. Metamorphic degree had a negligible correlation with the evolution of main functional groups, whereas evident metamorphism-dependent alterations were observed in their transition characteristics, and transition temperature, in particular, escalated as metamorphic degree rose. Moreover, Pearson and Gray correlation analyses corroborated hydroxyl, aliphatic hydrocarbons, and carbonyl groups as key functional groups governing heat release. This study lays a theoretical basis for elucidating the mechanism of CSC of low-rank coal and formulating targeted preventive measures. Furthermore, the results deliver pivotal guidance for safely exploiting coal resources as well as alleviating losses associated with spontaneous combustion disasters.