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Experimental study on CO and CO2 emissions from spontaneous heating of coals at varying temperatures and O2 concentrations

机译：在不同温度和O2浓度下自发加热煤产生的CO和CO2排放的实验研究

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Laboratory experiments were conducted to investigate carbon monoxide (CO) and carbon dioxide (CO2) emissions from spontaneous heating of three U.S. coal samples in an isothermal oven at temperatures between 50 and 110 °C. The oxygen (O2) concentration of an oxygenitrogen (N2) mixture flowing through the coal sample was 3, 5, 10, 15, and 21%, respectively. The temperature at the center of the coal sample was continuously monitored, while the CO, CO2, and O2 concentrations of the exit gas were continuously measured. The results indicate that the CO and CO2 concentrations and the CO/CO2 ratio increased when the initial temperature was increased. As the inlet O2 concentration increased, the CO and CO2 concentrations increased, while the CO/CO2 ratios tended to converge to the same value. The ratio of CO/CO2 was found to be independent of coal properties, approaching a constant value of 0.2. The maximum CO production rate correlated well with the maximum coal temperature rise. The apparent order of reaction for coal oxidation was estimated to be between 0.52 and 0.72. The experimental results in this study could be used for early detection and evaluation of a spontaneous heating in underground coal mines.
机译：进行了实验室实验，以研究在恒温箱中在50至110°C之间自发加热三个美国煤样品而产生的一氧化碳（CO）和二氧化碳（CO2）排放量。流经煤样品的氧气/氮气（N2）混合物的氧气（O2）浓度分别为3％，5％，10％，15％和21％。连续监测煤样品中心的温度，同时连续测量出口气体的CO，CO2和O2浓度。结果表明，当初始温度升高时，CO和CO2浓度以及CO / CO2比增加。随着入口O2浓度的增加，CO和CO2浓度增加，而CO / CO2之比趋于收敛至相同值。发现CO / CO 2的比例与煤的性质无关，接近恒定值0.2。最大的CO产生速率与最大的煤温升高很好地相关。煤氧化的表观反应顺序估计在0.52至0.72之间。这项研究的实验结果可用于地下煤矿自发加热的早期检测和评估。

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