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Investigating the reaction mechanism of light tar for Shenfu bituminous coal pyrolysis

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  • Lei, Zhao
  • Liang, Qijun
  • Ling, Qiang
  • Cui, Ping
  • Zhao, Zhigang

Abstract

The generation mechanism of light tar during Shenfu bituminous coal pyrolysis was investigated in this work. TGA, Py-GC/MS, TGA-FTIR and reactive force field simulations (ReaxFF) were implemented to reveal the light tar reaction mechanism. The proposed coal structure model was C3198H3261N51O513S33, whose pyrolysis was simulated using the ReaxFF method. Simulation results showed that the pyrolysis process was divided into activation, pyrolysis, and condensation, which agreed well with TGA results. Based on evolutions of gases in the activation stage, it was discovered that coal pyrolysis was initiated by the cleavage of oxygen-containing groups. Simulated results with the coal unimolecular structure showed that the reaction mechanism of light tar was free radical addition reaction, where free radicals were mainly obtained from the cleavage of C–O chemical bond. Also, it was found that the temperature of 2400 K was the transition point, indicating the transition of dominating bond cleavage from C–O bond to C–C bond. The variation of chemical bond agreed well with TGA-FTIR and Py-GC/MS results, indicating that the simulated results are valid and convincing. Therefore, it was concluded that the free radical addition reaction that was mainly controlled by the rupture of C–O bond was the reaction mechanism of light tar.

Suggested Citation

  • Lei, Zhao & Liang, Qijun & Ling, Qiang & Cui, Ping & Zhao, Zhigang, 2023. "Investigating the reaction mechanism of light tar for Shenfu bituminous coal pyrolysis," Energy, Elsevier, vol. 263(PB).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pb:s0360544222026172
    DOI: 10.1016/j.energy.2022.125731
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    References listed on IDEAS

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    1. Liang, Wang & Ning, Xiaojun & Wang, Guangwei & Zhang, Jianliang & Li, Rongpeng & Chang, Weiwei & Wang, Chuan, 2021. "Influence mechanism and kinetic analysis of co-gasification of biomass char and semi-coke," Renewable Energy, Elsevier, vol. 163(C), pages 331-341.
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    Cited by:

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    2. Qin, Tao & Lu, Qiuxiang & Xiang, Hao & Luo, Xiulin & Shenfu, Yuan, 2023. "Ca promoted Ni–Co bimetallic catalyzed coal pyrolysis and char steam gasification," Energy, Elsevier, vol. 282(C).
    3. Yang, Yu & Kai, Reo & Watanabe, Hiroaki, 2024. "Reaction mechanism and light gas conversion in pyrolysis and oxidation of dimethyl ether (DME): A ReaxFF molecular dynamics study," Energy, Elsevier, vol. 295(C).
    4. Xu, Tong & Wang, Chunbo & Hong, Dikun, 2023. "Programmable heating and quenching for enhancing coal pyrolysis tar yield: A ReaxFF molecular dynamics study," Energy, Elsevier, vol. 285(C).
    5. Ma, Liyang & Zhang, Lan & Wang, Deming & Xin, Haihui & Ma, Qiulin, 2023. "Effect of oxygen-supply on the reburning reactivity of pyrolyzed residual from sub-bituminous coal: A reactive force field molecular dynamics simulation," Energy, Elsevier, vol. 283(C).
    6. Yang, Panxi & Guo, Wei & Yu, Zunyi & Gao, Kun & Jing, Wang & Jie, Zhang & Shang, Jianxuan & Yang, Bolun & Wu, Zhiqiang, 2023. "Modified network kinetic model for coal pyrolysis with high-value products and low carbon emissions11The short version of the paper was presented at ICAE2022, Bochum, Germany, Aug 8–11, 2022. This pap," Applied Energy, Elsevier, vol. 351(C).
    7. Jiang, Xu & Xu, Jun & He, Qichen & Wang, Cong & Jiang, Long & Xu, Kai & Wang, Yi & Su, Sheng & Hu, Song & Du, Zhenyi & Xiang, Jun, 2023. "A study of the relationships between coal heterogeneous chemical structure and pyrolysis behaviours: Mechanism and predicting model," Energy, Elsevier, vol. 282(C).

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