4.6 Article

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

Journal

Publisher

SPRINGER
DOI: 10.1007/s12613-021-2305-3

Keywords

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

Funding

  1. National Natural Science Foundation of China [52074029, 51804026]
  2. USTB-NTUT Joint Research Program [06310063]
  3. Vinnova [dnr: 2017-01327]

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The combustion kinetics of hydrochar were studied using a multi-Gaussian-distributed activation energy model, revealing the process can be divided into different stages and changes with temperature variations.
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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