Abstract It is imperative to have an in-depth understanding of the relationship between oxygen consumption and gaseous product emissions during coal self-heating not only for preventing fires in the coal industry but also for reducing emissions of hazardous gases. Two typical coal samples with high tendency of spontaneous combustion were heated to 230 °C with a programmed temperature of 1.0 K min−1 using a pilot-scale test apparatus. The trends for oxygen consumption and gaseous product emissions were obtained from continuous measurements of the gas samples at the reactor outlet via a gas chromatography equipped with a Flame Photometric Detector. Based on the rates of oxygen consumption and gaseous product emissions, the relationship between oxygen consumption and each gaseous product emission was studied. Multi-linear regressions of the oxygen consumption and gaseous product emissions were performed. The coefficients for the emission rates of CO2, CO and H2 in the regression equations of the two coals with three different particle sizes are found to be all positive, while the coefficients for the CH4 emission rates are all negative. These results indicate that the oxygen consumption of coal facilitates the release of CO2, CO and H2, while the increase of oxygen consumption rate may not enhance the release of hydrocarbon gas. Based on the results, an evaluation index defined as the ratio of oxygen consumption rate to the gaseous product emission rate is proposed to assess the state of coal spontaneous combustion.

中文翻译：

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基于耗氧量与气体产物排放关系的煤自燃状态评估

摘要 深入了解煤炭自热过程中耗氧量与气态产物排放量的关系，不仅对煤炭行业的火灾预防，而且对减少有害气体的排放也势在必行。使用中试规模的测试装置将两个具有高度自燃倾向的典型煤样加热至 230 °C，程序温度为 1.0 K min-1。氧气消耗和气体产物排放的趋势是通过配备有火焰光度检测器的气相色谱仪在反应器出口处对气体样品的连续测量获得的。基于耗氧量和气态产物排放率，研究了耗氧量与各气态产物排放量之间的关系。进行了氧消耗和气体产物排放的多元线性回归。发现三种不同粒径的两种煤的回归方程中CO2、CO和H2的排放率系数均为正，而CH4排放率的系数均为负。这些结果表明，煤耗氧促进了CO2、CO和H2的释放，而耗氧率的增加可能不会促进烃类气体的释放。在此基础上，提出了用氧消耗率与气态产物排放率之比来评价煤自燃状态的评价指标。发现三种不同粒径的两种煤的回归方程中的 CO 和 H2 均为正，而 CH4 排放率的系数均为负。这些结果表明，煤耗氧促进了CO2、CO和H2的释放，而耗氧率的增加可能不会促进烃类气体的释放。在此基础上，提出了用氧消耗率与气态产物排放率之比来评价煤自燃状态的评价指标。发现三种不同粒径的两种煤的回归方程中的 CO 和 H2 均为正，而 CH4 排放率的系数均为负。这些结果表明，煤耗氧促进了CO2、CO和H2的释放，而耗氧率的增加可能不会促进烃类气体的释放。在此基础上，提出了用氧消耗率与气态产物排放率之比来评价煤自燃状态的评价指标。而氧气消耗率的增加可能不会增加烃类气体的释放。在此基础上，提出了用氧消耗率与气态产物排放率之比来评价煤自燃状态的评价指标。而氧气消耗率的增加可能不会增加烃类气体的释放。在此基础上，提出了用氧消耗率与气态产物排放率之比来评价煤自燃状态的评价指标。