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Kinetic analysis and modeling of maize straw hydrochar combustion using a multi-Gaussian-distributed activation energy model

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Abstract

Combustion kinetics of the hydrochar was investigated using a multi-Gaussian-distributed activation energy model (DAEM) to expand the knowledge on the combustion mechanisms. The results demonstrated that the kinetic parameters calculated by the multi-Gaussian-DAEM accurately represented the experimental conversion rate curves. Overall, the feedstock combustion could be divided into four stages: the decomposition of hemicellulose, cellulose, lignin, and char combustion. The hydrochar combustion could in turn be divided into three stages: the combustion of cellulose, lignin, and char. The mean activation energy ranges obtained for the cellulose, lignin, and char were 273.7–292.8, 315.1–334.5, and 354.4–370 kJ/mol, respectively, with the standard deviations of 2.1–23.1, 9.5–27.4, and 12.1–22.9 kJ/mol, respectively. The cellulose and lignin contents first increased and then decreased with increasing hydrothermal carbonization (HTC) temperature, while the mass fraction of char gradually increased.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 52074029, 51804026) and the USTB—NTUT Joint Research Program (No. 06310063). Chuan Wang would like to acknowledge the funding support from Vinnova (dnr: 2017-01327).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Chunmei Yu, Guangwei Wang, Haipeng Teng, Tao Li & Chunchao Huang

  2. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Shan Ren

  3. Department of Physics, University of Science and Technology Beijing, Beijing, 100083, China

    Junjun Xu

  4. Swerim AB, Luleå, SE-971 25, Sweden

    Chuan Wang

  5. Thermal and Flow Engineering Laboratory, Åbo Akademi University, Åbo, FI-20500, Finland

    Chuan Wang

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  1. Chunmei Yu
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Correspondence to Shan Ren or Guangwei Wang.

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Yu, C., Ren, S., Wang, G. et al. Kinetic analysis and modeling of maize straw hydrochar combustion using a multi-Gaussian-distributed activation energy model. Int J Miner Metall Mater 29, 464–472 (2022). https://doi.org/10.1007/s12613-021-2305-3

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  • DOI: https://doi.org/10.1007/s12613-021-2305-3

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