Study on the influence of key active groups on gas products in spontaneous combustion of coal
Study on the influence of key active groups on gas products in spontaneous combustion of coal
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DOI：
10.1016/j.fuel.2023.128020
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发表时间：
2023-03-10
期刊：
影响因子：
7.4
通讯作者：
Chen, Xiao-Kun
中科院分区：
文献类型：
--
作者：
Ma, Teng;Zhai, Xiao-Wei;Chen, Xiao-Kun
为了揭示煤自燃过程中活性基团与气体产物之间的内在关系，通过程序升温实验和原位红外光谱分析实验研究了活性官能团含量与气体产物生成的相关性。结果表明，陕北侏罗系煤自燃瓦斯释放曲线存在3个特征温度点，可分为缓慢氧化阶段、临界温度阶段、快速氧化反应阶段和燃烧阶段。 CH3、CH2、C-H和OH在煤的自燃过程中被积极消耗。 C--O逐渐增多，是陕北侏罗纪煤炭氧化过程中的重要氧化产物。链长CH2/CH3受到攻击，断裂缩短，煤中C--O/C--C的富氧程度逐渐增加。获得了侏罗纪陕北不同煤层煤氧化加热过程中CH3、CH2、C-H、OH、C--O、CH2/CH3、C--O/C--C等关键活性基团与氧、碳及氧气、烷烃、烯烃气体的相关值。结果表明：CH3、CH2和CH2/CH3是陕北侏罗纪煤氧化过程中氧分子攻击结合的主要部分，煤的富氧产物分解为碳氧气和烷烃气体。由于各种活性基团的活化能不同，煤的自燃在各个阶段表现出不同的反应程度。研究成果可用于了解煤炭自燃的发生和发展程度，对煤炭自燃的监测预警、煤炭自燃灾害的针对性防治具有重要的指导意义。
In order to reveal the internal relationship between the active groups and gas products in spontaneous com-bustion of coal, the correlation between the content of active functional groups and the production of gas products was studied by temperature programmed experiment and in situ infrared spectroscopy analysis experiment. The results show that there are three characteristic temperature points in the gas release curve of Jurassic coal spontaneous combustion in northern Shaanxi, which can be divided into slow oxidation stage, critical temperature stage, rapid oxidation reaction stage and combustion stage. CH3 , CH2 , C-H and OH are actively consumed in the spontaneous combustion of coal. C--O gradually increased, which is an important oxidation product during Jurassic coal oxidation in northern Shaanxi. The chain length CH2/CH3 is attacked and the fracture shortened, while the oxygen enrichment degree of C--O/C--C in coal increases gradually. The correlation values of key active groups of CH3 , CH2 , C-H, OH, C--O, CH2/CH3 , and C--O/C--C with oxygen, carbon and oxygen gases and alkane and olefin gases in the process of coal oxidation heating in different coal seams in northern Shaanxi during Jurassic period are obtained. The results show that CH3 , CH2 and CH2/CH3 , are the main parts of oxygen molecules attacking and binding in the Jurassic coal oxidation process in northern Shaanxi, and the oxygen-rich products of coal decompose into carbon oxygen gas and alkane alkene gas. Due to the different activation energies of various active groups, the spontaneous combustion of coal shows different reaction degrees in each stage. The research results can be used to understand the occurrence and development degree of spontaneous coal combustion, and have important guiding significance for the monitoring and warning of spontaneous coal combustion and the targeted prevention and control of spontaneous coal combustion disasters.