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

Chunmei Yu; Shan Ren; Guangwei Wang; Junjun Xu; Haipeng Teng; Tao Li; Chunchao Huang; Chuan Wang

doi:10.1007/s12613-021-2305-3

Volume 29 Issue 3

Mar. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(3): 464-472

Chunmei Yu, Shan Ren, Guangwei Wang, Junjun Xu, Haipeng Teng, Tao Li, Chunchao Huang, and Chuan Wang, Kinetic analysis and modeling of maize straw hydrochar combustion using a multi-Gaussian-distributed activation energy model, Int. J. Miner. Metall. Mater., 29(2022), No. 3, pp. 464-472. https://doi.org/10.1007/s12613-021-2305-3

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Chunmei Yu, Shan Ren, Guangwei Wang, Junjun Xu, Haipeng Teng, Tao Li, Chunchao Huang, and Chuan Wang, Kinetic analysis and modeling of maize straw hydrochar combustion using a multi-Gaussian-distributed activation energy model, Int. J. Miner. Metall. Mater., 29(2022), No. 3, pp. 464-472. https://doi.org/10.1007/s12613-021-2305-3

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Research Article

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

+ Author Affiliations

Corresponding authors:
Shan Ren E-mail: shan.ren@cqu.edu.cn

Guangwei Wang E-mail: guangwei_wang@ustb.edu.cn
Received: 30 December 2020; Revised: 12 May 2021; Accepted: 17 May 2021; Available online: 18 May 2021

Abstract

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.
- hydrothermal carbonization;
- maize straw;
- combustion kinetics;
- distributed activation energy model

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