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

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)464-472
Number of pages9
JournalInternational Journal of Minerals, Metallurgy and Materials
Volume29
Issue number3
DOIs
Publication statusPublished - Mar 2022
Externally publishedYes
MoE publication typeA1 Journal article-refereed

Keywords

  • combustion kinetics
  • distributed activation energy model
  • hydrothermal carbonization
  • maize straw

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