王振兴,王洋,韩东洋,等. 煤矸石放热危险性与微观基团相关性研究[J]. 煤矿安全,2024,55(2):107−115. doi: 10.13347/j.cnki.mkaq.20230621
    引用本文: 王振兴,王洋,韩东洋,等. 煤矸石放热危险性与微观基团相关性研究[J]. 煤矿安全,2024,55(2):107−115. doi: 10.13347/j.cnki.mkaq.20230621
    WANG Zhenxing, WANG Yang, HAN Dongyang, et al. Study on correlation between exothermic risk of coal gangue and microscopic groups[J]. Safety in Coal Mines, 2024, 55(2): 107−115. doi: 10.13347/j.cnki.mkaq.20230621
    Citation: WANG Zhenxing, WANG Yang, HAN Dongyang, et al. Study on correlation between exothermic risk of coal gangue and microscopic groups[J]. Safety in Coal Mines, 2024, 55(2): 107−115. doi: 10.13347/j.cnki.mkaq.20230621

    煤矸石放热危险性与微观基团相关性研究

    Study on correlation between exothermic risk of coal gangue and microscopic groups

    • 摘要: 为了探究煤矸石自燃过程放热危险性及其与微观基团的相关性,利用红外光谱实验和差示扫描量热实验测试了4种煤矸石的微观结构和自燃放热特征;基于放热量和活化能建立了煤矸石自燃危险系数,并确定了其与微观基团之间的相关性。结果表明:4种煤矸石(编号CG1、CG2、CG3、CG4)均含有取代苯,‒C=C‒、Ar‒CH、‒CH3、‒CH2‒、Al‒CH、‒OH、‒C‒O‒、‒C=O及无机物等基团,但各基团的含量存在显著差异;煤矸石的自燃放热可分为水分蒸发,缓慢放热和燃烧3个阶段,但不同的煤矸石3个阶段的持续时间和放热量不同;4种煤矸石在吸热阶段的活化能大小依次为CG1>CG3>CG2>CG4,而在放热阶段煤矸石的活化能大小为CG3>CG4>CG2>CG1;4种煤矸石自燃危险系数的大小依次为CG1>CG2>CG4>CG3,微观基团与其相关性大小依次为‒C‒O‒>取代苯>‒OH>‒CH3>‒C=C‒>无机物>‒CH2‒>Ar‒CH>‒C=O>Al‒CH>‒COO‒,其中前三者的相关性均大于0.85;‒C‒O‒,取代苯和‒OH含量较多的煤矸石具有更大的自燃危险性。

       

      Abstract: In order to explore the exothermic hazard of coal gangue in the process of spontaneous combustion and its correlation with microscopic groups, the microstructure and exothermic characteristics of four kinds of coal gangue(CG1、CG2、CG3、CG4) were tested by infrared spectrum experiment and differential scanning calorimetry experiment; based on the exothermic heat and activation energy, the spontaneous combustion risk coefficient of coal gangue is established, and the correlation between spontaneous combustion risk coefficient and the microscopic groups is determined. The results show that the four kinds of coal gangue all contain substituted benzene, ‒C=C‒, Ar‒CH, ‒CH3, ‒CH2‒, Al‒CH, ‒OH, ‒C‒O‒, ‒C=O and inorganic compound groups, but the content of each group is significantly different. The exothermic process of self‒ignition of coal gangue can be divided into three stages: water evaporation, slow exotherm and combustion, but the duration of the three stages is different for different coal gangue. The activation energy of the four kinds of coal gangue in the endothermic stage is CG1>CG3>CG2>CG4, while that of the coal gangue in the exothermic stage is CG3>CG4>CG2>CG1. The spontaneous combustion risk coefficients of the four kinds of coal gangue are in the order of CG1>CG2>CG4>CG3, and the correlation between microscopic groups and benzene is in the order of ‒C‒O‒ > substituted benzene > ‒OH> ‒CH3> ‒C=C‒> inorganic matter > ‒CH2‒ >Ar‒CH> ‒C=O>Al‒CH> ‒COO‒, the correlation of the first three is greater than 0.85. Therefore, coal gangue with higher levels of ‒C‒O‒, substituted benzene and‒OH has a greater risk of spontaneous combustion.

       

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