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<p>Coal–oil coexistence in mines boosts spontaneous combustion risks due to crude oil infiltration. This study used the reference program heating method, in situ infrared spectroscopy, and gray correlation analysis to explore oil-impregnated coal’s gases and functional groups. Results showed that when crude oil addition exceeds 7.5%, its volume increase significantly suppresses index gas generation, with a strong correlation (above 0.74) between –OH groups and index gas changes. Four gas indicators (CO, C<sub>2</sub>H<sub>4</sub>, φ(CO)/φ(CO<sub>2</sub>), φ(C<sub>2</sub>H<sub>4</sub>)/φ(CH<sub>4</sub>)) described coal combustion. The study categorized coal combustion potential into five warning levels and four temperature thresholds, aiding monitoring, early warning, and assessing combustion severity in coal–oil coexistence mines.</p>

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Gas-active group correlation mechanism of spontaneous combustion indicators and hierarchical early warning system of oil-impregnated coal samples based on the reference method

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Yuntao Liang,
  • Yutao Zhang,
  • Mengru Ren,
  • Linjia Wang,
  • Fuchao Tian,
  • Yaqing Li,
  • Yuanbo Zhang,
  • Hui Jin

摘要

Coal–oil coexistence in mines boosts spontaneous combustion risks due to crude oil infiltration. This study used the reference program heating method, in situ infrared spectroscopy, and gray correlation analysis to explore oil-impregnated coal’s gases and functional groups. Results showed that when crude oil addition exceeds 7.5%, its volume increase significantly suppresses index gas generation, with a strong correlation (above 0.74) between –OH groups and index gas changes. Four gas indicators (CO, C2H4, φ(CO)/φ(CO2), φ(C2H4)/φ(CH4)) described coal combustion. The study categorized coal combustion potential into five warning levels and four temperature thresholds, aiding monitoring, early warning, and assessing combustion severity in coal–oil coexistence mines.