Correlation analysis of the functional groups and exothermic characteristics of bituminous coal molecules during high-temperature oxidation
Correlation analysis of the functional groups and exothermic characteristics of bituminous coal molecules during high-temperature oxidation
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烟煤分子高温氧化过程中官能团与放热特性的相关分析
DOI：
10.1016/j.energy.2019.05.158
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发表时间：
2019-08
期刊：
影响因子：
9
通讯作者：
Zeng Qiang
中科院分区：
文献类型：
--
作者：
Zhao Jingyu;Deng Jun;Chen Long;Wang Tao;Song Jiajia;Zhang Yanni;Shu Chi Min;Zeng Qiang
煤自燃具有高温氧化和微观机理的特点。这些是试图控制或防止自燃时需要了解的基本方面。从中国淮南采集了三个新鲜烟煤样品用于实验。采用X射线衍射和傅里叶变换红外光谱法研究了煤在高温氧化过程中的微观特征。确定了煤的矿物结构和官能团，以确保获得煤的原始结构特征。采用热重-差示扫描量热法将高温氧化过程分为四个阶段，得到了详细的放热特征。此外，为了研究官能团与其放热特性之间的关系，对四个氧化阶段中的定量现象进行了相关性分析。结果表明，含氧基团最初是最活跃的和反应性的14种类型的功能基团。自燃最迅速的阶段，也是最应该谨慎和意识到风险的阶段，是氧气吸收和质量增加阶段，因为热能输出迅速增加并通过了这个阶段，从而导致危险且可能无法恢复的情况。
Coal spontaneous combustion is characterized by high-temperature oxidation and microscopic mechanisms. These are essential aspects to understand when attempting to control or prevent spontaneous combustion. Three fresh bituminous coal samples were collected for experimentation from Huainan, China. X-ray diffraction and Fourier-transform infrared spectrometry were conducted to determine the microscopic characteristics of coal during high-temperature oxidation. The mineral structures and functional groups were ascertained to ensure that the original structural characteristics of the coals were obtained. Thermogravimetry–differential scanning calorimetry was used to divide the high-temperature oxidation into four substages and obtain detailed exothermic characteristics. The heat energy release exhibited a positive correlation with an increase in temperature.Moreover, to investigate the relationship between the functional groups and their exothermic characteristics, correlation analysis was conducted for describing the quantitative phenomena within the four oxidation stages. The results revealed that the oxygen-containing groups were initially the most active and reactive among the 14 types of functional groups. The most rapid stage of spontaneous combustion, in which should be the most cautious and aware of risks, was the oxygen adsorption and mass gain stage because the heat energy output increased rapidly and passed this stage, thus leading to dangerous and possibly unrecoverable situations.
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