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<p>Coal mine conveyor belts undergo thermo-oxidative aging, mechanical wear, and surface contamination during long-term service, which can alter their pyrolysis behavior and fire hazard. In this study, unused and in-service steel-cord PVG conveyor belts were comparatively investigated by scanning electron microscopy coupled with energy-dispersive spectrometry (SEM–EDS), thermogravimetry Fourier transform infrared spectroscopy-mass spectrometry (TG-FTIR-MS), and cone calorimetry. The results show that the used belt exhibits more severe abrasive damage, denser microcracks, more developed pore structures, and clearer surface enrichment in Cl. Under Ar, the peak temperatures of HCl release shift to lower values by 108.92&#xa0;°C, while the peak temperatures of CO and CO<sub>2</sub> decrease by 101.33–125.15&#xa0;°C. Under air, the peak temperature of HCl decreases by 12.77%, whereas the peak temperatures of CO and CO<sub>2</sub> are delayed by 23.07% and 21.42%, respectively. The used belt has a lower peak heat-release rate, a higher post-combustion residue, and more persistent smoke release. Long-term service significantly changes both the gas-evolution profile and the macroscopic combustion behavior of conveyor belts. These findings provide a useful basis for improving characteristic-gas monitoring, early warning, and fire-risk control for aged conveyor belts in underground coal mines.</p>

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Analysis of pyrolysis gas and combustion characteristics before and after the use of coal mine conveyor belts

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Peiyang Su,
  • Jiayong Zhang,
  • Liwen Guo

摘要

Coal mine conveyor belts undergo thermo-oxidative aging, mechanical wear, and surface contamination during long-term service, which can alter their pyrolysis behavior and fire hazard. In this study, unused and in-service steel-cord PVG conveyor belts were comparatively investigated by scanning electron microscopy coupled with energy-dispersive spectrometry (SEM–EDS), thermogravimetry Fourier transform infrared spectroscopy-mass spectrometry (TG-FTIR-MS), and cone calorimetry. The results show that the used belt exhibits more severe abrasive damage, denser microcracks, more developed pore structures, and clearer surface enrichment in Cl. Under Ar, the peak temperatures of HCl release shift to lower values by 108.92 °C, while the peak temperatures of CO and CO2 decrease by 101.33–125.15 °C. Under air, the peak temperature of HCl decreases by 12.77%, whereas the peak temperatures of CO and CO2 are delayed by 23.07% and 21.42%, respectively. The used belt has a lower peak heat-release rate, a higher post-combustion residue, and more persistent smoke release. Long-term service significantly changes both the gas-evolution profile and the macroscopic combustion behavior of conveyor belts. These findings provide a useful basis for improving characteristic-gas monitoring, early warning, and fire-risk control for aged conveyor belts in underground coal mines.