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Influence of microstructure characteristics of deep mine coal on oxidation heat effect

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Abstract

The spontaneous combustion period of coal in deep mines is short, so the risk of coal spontaneous combustion (CSC) is high, and it is cause environmental pollution. To explore the relationships between the microstructure and thermal effect of coal in deep mine, the relation among microstructure, activation energy and thermal effect of CSC was analysed using differential scanning calorimetry, Fourier infrared spectroscopy and synchronous thermal analyser, respectively. Results show that the process of coal self-combustion can be divided into 3 stages: the slow oxidation stage, accelerated oxidation stage and rapid combustion stage. In the slow oxidation stage, the XJL coal sample experienced the largest thermal release, and the main functional group was C–H–. In the accelerated oxidation and rapid combustion stages, the ZL coal experienced the largest thermal release; the functional groups are mainly C=C, –CH3, –CH2. In simpler terms, aromatic hydrocarbon significantly impacts the heating process of TK coal combustion. The structure of these hydrocarbons shows the highest correlation with the thermal release, followed by oxygen-containing functional groups for gas coal. These findings can help manage the risks of CSC and prevent potential dangers.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 5217-4201, 5207-4215), the Shaanxi Science Fund for Distinguished Young Scholars (2022JC-30) and Shaanxi Province “Special Support Program for High-leve1 Talents” Young Top Talent.

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Authors and Affiliations

  1. School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, 710054, Shaanxi, People’s Republic of China

    Jun Deng, Nannan Yang, Caiping Wang, Zujing Bai, Yin Deng, Xiadan Duan & Gaoyang Qu

  2. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi’an, 710054, People’s Republic of China

    Jun Deng, Nannan Yang, Caiping Wang, Zujing Bai, Yin Deng, Xiadan Duan & Gaoyang Qu

  3. China Resources New Energy (Xilinhot), Co., Ltd., Xilinhot, 026000, People’s Republic of China

    Xiaoyong Zhao

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  1. Jun Deng
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Contributions

JD was involved in supervision, writing—reviewing and editing, and validation. NNY was responsible for conceptualisation, methodology and writing—original draft preparation. CPW took part in supervision and data curation. ZJB, XYZ and QG contributed to supervision. YD and DX carried out investigation.

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Correspondence to Nannan Yang or Caiping Wang.

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We declare that we have no financial and personal relationships with other people or organisations that can inappropriately influence our work, there is no professional or other personal interest of any nature or kind in any product, service or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled, “Influence of microstructure characteristics of deep mine coal on oxidation heat effect”.

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Deng, J., Yang, N., Wang, C. et al. Influence of microstructure characteristics of deep mine coal on oxidation heat effect. J Therm Anal Calorim 148, 11053–11068 (2023). https://doi.org/10.1007/s10973-023-12420-w

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