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Thermodynamic variation law and influence mechanism of low-temperature oxidation of lignite samples with different moisture contents

Author

Listed:
  • Li, Min
  • Yang, Xueqin
  • Lu, Yi
  • Wang, Deming
  • Shi, Shiliang
  • Ye, Qing
  • Li, He
  • Wang, Zheng

Abstract

Coal spontaneous combustion (CSC) is one of the main disasters that threaten the safe production in coal mines. Moisture, which is the main factor affecting coal oxidation, has a considerable impact on CSC. In this paper, the variation characteristics of TG-DTG and DSC-DDSC curves of two kinds of lignite during low-temperature oxidation were investigated. The following results were obtained: Oxidation-induced heat production (OHP) starts to play a leading role in the temperature range of 50–75 °C; pyrolysis-induced heat absorption (PHA) grows faster than OHP in the temperature range of 70–130 °C; and OHP is dominant in the temperature range of 130–260 °C. Furthermore, for coal samples from Shengli (SL) Coal Mine and Yuanbaoshan (YB) Coal Mine, the initial heat release temperature and the end temperature both conform to the Lorentz function T=T0+2A(B4(M−Mc)2+B2). Thermodynamic parameters reach the maximum under the moisture content of 12%–17% where the CSC is the most likely to occur. In the oxygen adsorption and weight gain stage, the activation energy decreases and gradually stabilizes with the increase in moisture content. In the accelerated oxidation stage, moisture in coal plays a chemical catalytic role in the processes of oxygen chemical adsorption and intermediate complex formation and decomposition. However, excessive moisture cannot accelerate the coal-oxygen composite reaction.

Suggested Citation

  • Li, Min & Yang, Xueqin & Lu, Yi & Wang, Deming & Shi, Shiliang & Ye, Qing & Li, He & Wang, Zheng, 2023. "Thermodynamic variation law and influence mechanism of low-temperature oxidation of lignite samples with different moisture contents," Energy, Elsevier, vol. 262(PB).
    • Handle: RePEc:eee:energy:v:262:y:2023:i:pb:s0360544222024914
    DOI: 10.1016/j.energy.2022.125605
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    References listed on IDEAS

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    1. Yuguo Wu & Yulong Zhang & Jie Wang & Xiaoyu Zhang & Junfeng Wang & Chunshan Zhou, 2020. "Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action," Energies, MDPI, vol. 13(8), pages 1-17, April.
    2. Li, Jinhu & Li, Zenghua & Yang, Yongliang & Duan, Yujian & Xu, Jun & Gao, Ruiting, 2019. "Examination of CO, CO2 and active sites formation during isothermal pyrolysis of coal at low temperatures," Energy, Elsevier, vol. 185(C), pages 28-38.
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    4. Deng, Jun & Yang, Yi & Zhang, Yan-Ni & Liu, Bo & Shu, Chi-Min, 2018. "Inhibiting effects of three commercial inhibitors in spontaneous coal combustion," Energy, Elsevier, vol. 160(C), pages 1174-1185.
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    Cited by:

    1. Zhang, Leilin & Wen, Chenchen & Li, Shengli & Yang, Mengdan, 2024. "Evolution and oxidation properties of the functional groups of coals after water immersion and air drying," Energy, Elsevier, vol. 288(C).
    2. Cai, Jiawen & Yu, Zhaoyang & Yang, Shengqiang & Tang, Jingxia & Ma, Zhenqian & Xie, Xionggang & Hu, Xincheng, 2023. "Fractal characteristics of coal surface structure during low-temperature oxidation and its effect on oxidizability," Energy, Elsevier, vol. 284(C).

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