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Combustion characteristics and kinetic analysis for pyrolysis char of torrefied pretreament from camellia shell

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Abstract

In this study, the combustion experiments were carried out in a simultaneous thermogravimetric analyzer and in an oxidizing atmosphere at four heating rates of 5, 10, 15, and 20 °C/min, respectively. The thermal decomposition kinetics of pyrolysis char of torrefied treatment (T-P-char) from camellia shell were invested by the isoconversional methods of Friedman and Ozawa. The results showed that the correlation coefficients of the experiment data fitting were all over 0.99, and both the average values of activation energy and pre-exponential from Ozawa were higher than those of Friedman method. The enthalpy analysis indicated that the energy difference between the activated complex and the reagent was consistent with activation energy. The Gibbs free energy changed from 185.08 kJ/mol to 204.87 kJ/mol, and the entropy changes were negative, implying that the disorder degree of the products was lower than that of the initial reactants. Moreover, the reaction mechanism transformed from the random nucleation and growth reaction to the nth order reaction when the pyrolysis temperature exceeded 450 °C.

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Funding

This work was financially supported by the National Natural Science Foundation of China (grant number: 51706074) and the Bureau of Guangdong Forestry (grant number: No.2020KJCX008).

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Authors and Affiliations

  1. Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, 483 Wushan Road, Guangzhou, 510642, China

    Riying Qi, Aihua Xiang, Mingfeng Wang, Enchen Jiang, Ziwei Li, Haobin Xiao & Xiongquan Tan

Authors
  1. Riying Qi
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  2. Aihua Xiang
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  3. Mingfeng Wang
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  4. Enchen Jiang
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  5. Ziwei Li
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  6. Haobin Xiao
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  7. Xiongquan Tan
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Contributions

Mingfeng Wang: conceptualization, methodology, investigation, project administration, formal analysis.

Riying Qi: writing-original draft preparation, formal analysis.

Aihua Xiang: methodology.

Enchen Jiang: supervision.

Ziwei Li: methodology.

Haobin Xiao: resources.

Xiongquan Tan: data curation.

Corresponding author

Correspondence to Mingfeng Wang.

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The authors declare no competing interests.

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Riying Qi and Aihua Xiang contributed equally to this work and are joint first authors.

Highlights

1. The kinetic reactions were random nucleation growth and nth order reaction.

2. The pyrolysis and torrefaction temperature had opposite effects on E and lgA under 550 °C.

3. The enthalpies (△H) were consistent with E.

4. The changes of entropies (△S) were negative.

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Qi, R., Xiang, A., Wang, M. et al. Combustion characteristics and kinetic analysis for pyrolysis char of torrefied pretreament from camellia shell. Biomass Conv. Bioref. 14, 3501–3512 (2024). https://doi.org/10.1007/s13399-022-02486-1

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  • DOI: https://doi.org/10.1007/s13399-022-02486-1

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