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Effect of active functional groups in coal on the release behavior of small molecule gases during low-temperature oxidation

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  • Meng, Xianliang
  • Sun, Jiali
  • Chu, Ruizhi
  • Fan, Lulu
  • Jiang, Xiaofeng
  • Tang, Ludeng
  • Zheng, Donglin

Abstract

The low-temperature oxidation of active groups in coal plays an important role in the release of small molecule gases during coal spontaneous combustion. In this paper, under the temperature of 30 °C–350 °C, the formation and release of small molecule gases and changes of active functional groups were investigated via TG-DSC, TG-IR and in-situ FTIR measurement on low-rank coal. The relationship between the gases and the active functional groups of coal were explored by grey correlation analysis. The methyl/methylene content in coal sample 1 is significantly higher than that in coal sample 2 and the initial content of OH–OH in the two coal samples is similar. The initial contents of oxygen-containing functional groups in coal sample 1 are higher. According to the grey correlation analysis, CO was mainly responsible for the formation of CO2 and CO. And methyl/methylene groups made a great contribution to producing CH4. 100 °C–200 °C is the key temperature for producing gases. The research results establish the relationship between microscopic changes and macroscopic phenomena of low-rank coal during low-temperature oxidation process, and provide research ideas for understanding low-rank coal low-temperature oxidation process and revealing low-temperature oxidation mechanism.

Suggested Citation

  • Meng, Xianliang & Sun, Jiali & Chu, Ruizhi & Fan, Lulu & Jiang, Xiaofeng & Tang, Ludeng & Zheng, Donglin, 2023. "Effect of active functional groups in coal on the release behavior of small molecule gases during low-temperature oxidation," Energy, Elsevier, vol. 273(C).
    • Handle: RePEc:eee:energy:v:273:y:2023:i:c:s0360544223006849
    DOI: 10.1016/j.energy.2023.127290
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    References listed on IDEAS

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    3. Li, Jinliang & Lu, Hao & Lu, Wei & Li, Jinhu & Zhang, Qingsong & Zhuo, Hui, 2024. "Study on the kinetic characteristics and control steps of gas production in coal spontaneous combustion under the oxidation path," Energy, Elsevier, vol. 295(C).
    4. Huang, Jiliang & Tan, Bo & Gao, Liyang & Shao, Zhuangzhuang & Wang, Haiyan & Chen, Zhen, 2023. "A multi-channel reaction model study of key primary and secondary active groups in the low-temperature oxidation process of coal," Energy, Elsevier, vol. 283(C).
    5. Zhou, Yufang & Gao, Mingqiang & Miao, Zhenyong & Cheng, Cheng & Wan, Keji & He, Qiongqiong, 2024. "Physicochemical properties and combustion kinetics of dried lignite," Energy, Elsevier, vol. 289(C).
    6. Bu, Yun-chuan & Niu, Hui-yong & Wang, Tao & Yang, Yan-xiao & Qiu, Tian, 2024. "Combustion characteristics of the thermal-mechanical coupling of broken coal in multiple atmospheres and the re-ignition laws of residual coal," Energy, Elsevier, vol. 299(C).

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