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Development of multi-scale pyrolysis and combustion model for fir wood

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Abstract

The combustion of wood materials is a complicated process involving multi-physics field coupling heat and mass transfer, with numerous intermediate volatiles from intricate sub-reactions. Both experimental and theoretical aspects of wood sample combustion were investigated in this work. Thermogravimetric analysis (TGA) experiments for Chinese fir wood sample with three different heating rates in a nitrogen atmosphere were carried out. The activation energies were calculated and analyzed. Additionally, bench-scale combustion experiments under the external radiation were conducted using a cone calorimeter. By incorporating appropriate assumptions and simplifying the complicated process, a one-dimension numerical model was developed to explore the micro-scale degradation kinetics and bench-scale combustion characteristics. A multi-scale comprehensive model addressing the pyrolysis and combustion processes was constructed in this study. Utilizing the thermophysical and kinetic parameters derived from the TGA test by employing a multi-parameter optimization algorithm, the combustion process, including variations in mass-loss rate (MLR) and heat release rate (HRR), was simulated. The model demonstrated strong predictive performance in MLR and HRR compared to the experimental data from bench-scale combustion. This research has implications for understanding solid fuel combustion mechanism and simulations.

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Acknowledgements

The authors would like to thank the National Key Research and Development (R&D) Plan of China under Grant No. 2020YFC1522800, the National Natural Science Foundation of China (NSFC, Grants 52176114 and 52111530091), and the Jiangsu Funding Program for Excellent Postdoctoral Talent.

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Authors and Affiliations

  1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, China

    Mi Li & Lin Jiang

  2. School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, China

    Dan Zhang

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  1. Mi Li
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  2. Dan Zhang
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  3. Lin Jiang
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Correspondence to Lin Jiang.

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Li, M., Zhang, D. & Jiang, L. Development of multi-scale pyrolysis and combustion model for fir wood. J Therm Anal Calorim 148, 10549–10555 (2023). https://doi.org/10.1007/s10973-023-12379-8

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  • DOI: https://doi.org/10.1007/s10973-023-12379-8

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