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Self-ignition risk classification for coal dust layers of three coal types on a hot surface

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  • Li, Bei
  • Liu, Gang
  • Bi, Ming-Shu
  • Li, Zhen-Bao
  • Han, Bing
  • Shu, Chi-Min

Abstract

Pulverised coal in industrial sites and their dust can experience spontaneous combustion and self-heating, increasing the risk of fire and dust explosion. The main objective of the present study was to resolve thermal combustibility (as reflected by comprehensive combustibility index [Sn] and kinetic properties) for three types of coal (S1-BN, S2-CY, and S3-JM) through thermal analysis. The Sn values of the samples indicated a degradation in the quality of comprehensive combustibility. Apparent activation energies (Ea) at the initial stage of spontaneous coal combustion (130–300 °C) were decided through Achar and Coats–Redfern methods. Moreover, thermal susceptibility (minimum auto-ignition temperature [MAIT] and thermodynamic parameters) was evaluated using the hot plate method. The MAIT values for the three coal dust layers were 210, 220, and 300 °C. The results exhibited that heat conduction was the dominant heat transfer mode that originated the temperature distribution within the coal dust layer under the subcritical conditions for ignition; while it converted chemical reaction controlled-mode after thermal runaway. Furthermore, the results based on an improved risk matrix approach showed the S1-BN and S2-CY samples had a high self-ignition risk, whereas the S3-JM sample had a moderate ignition risk.

Suggested Citation

  • Li, Bei & Liu, Gang & Bi, Ming-Shu & Li, Zhen-Bao & Han, Bing & Shu, Chi-Min, 2021. "Self-ignition risk classification for coal dust layers of three coal types on a hot surface," Energy, Elsevier, vol. 216(C).
    • Handle: RePEc:eee:energy:v:216:y:2021:i:c:s0360544220323045
    DOI: 10.1016/j.energy.2020.119197
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    References listed on IDEAS

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    1. Zhao, Jingyu & Deng, Jun & Wang, Tao & Song, Jiajia & Zhang, Yanni & Shu, Chi-Min & Zeng, Qiang, 2019. "Assessing the effectiveness of a high-temperature-programmed experimental system for simulating the spontaneous combustion properties of bituminous coal through thermokinetic analysis of four oxidatio," Energy, Elsevier, vol. 169(C), pages 587-596.
    2. Zhang, Yongliang & Jin, Bo & Zou, Xixian & Zhao, Haibo, 2016. "A clean coal utilization technology based on coal pyrolysis and chemical looping with oxygen uncoupling: Principle and experimental validation," Energy, Elsevier, vol. 98(C), pages 181-189.
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    2. Shi, Xueqiang & Wu, Hao & Jin, Penggang & Zhang, Yutao & Zhang, Yuanbo & Jiao, Fengyuan & Zhang, Yun & Cao, Weiguo, 2023. "On the influence of material and shape of the hot particles on the ignition characteristics of coal dust," Energy, Elsevier, vol. 281(C).
    3. Lv, Hongpeng & Li, Bei & Deng, Jun & Ye, Lili & Gao, Wei & Shu, Chi-Min & Bi, Mingshu, 2021. "A novel methodology for evaluating the inhibitory effect of chloride salts on the ignition risk of coal spontaneous combustion," Energy, Elsevier, vol. 231(C).
    4. Xiao, Qiuping & Zhang, Zhiwei & Shen, Xiaobo & Cai, Chenren & Ma, Pan & Li, Yuehua & Chen, Wanghua, 2023. "Combustion characteristics and reactions of stacked wet pulverized magnesium," Energy, Elsevier, vol. 268(C).

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