Fire hazard assessment in coal mines is performed on the basis of concentrations of particular gases emitted from the heating coal deposit, but more precise criteria and indicators are needed to assess fire hazard properly—both during the temperature rise phase and in the coal bed cooling phase. In the paper the impact of coal grinding on hazard assessment of spontaneous fire development in the coal deposit during heating and cooling the fire source was analyzed. The intensity of desorption of ethane, ethylene, propane, propylene, acetylene, carbon monoxide and hydrogen is the resultant of temperature and grinding of coal samples. The results proved that the ratio of concentrations emitted by standard versus coarsely crushed coal for each of the gases, changed both in the growth phase as well as in the temperature drop phase. It was found that as the temperature rose, the effect of coal grinding on the release of ethane, ethylene, propane, propylene and carbon monoxide decreased. The greatest effect of coal grinding was observed in the case of ethane and propane, while the lowest in the case of hydrogen and carbon monoxide.

中文翻译：

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煤层中自燃火源的加热和冷却评估-煤粒度的影响

煤矿火灾隐患评估是根据加热的煤层中排放的特定气体的浓度进行的，但是在温度上升阶段和煤层冷却阶段都需要更精确的标准和指标来正确评估火灾隐患。本文分析了磨煤对火源加热和冷却过程中煤层自燃的危险性评估的影响。乙烷，乙烯，丙烷，丙烯，乙炔，一氧化碳和氢气的解吸强度是煤样品温度和研磨的结果。结果证明，对于每种气体，标准气体与粗碎煤排放的浓度之比在生长期和降温阶段均发生了变化。发现随着温度的升高，煤磨对乙烷，乙烯，丙烷，丙烯和一氧化碳释放的影响降低。在乙烷和丙烷的情况下，观察到最大的磨煤效果，而在氢和一氧化碳的情况下观察到了最小的效果。