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Numerical simulation and prediction of fast pyrolysis behavior of biomass pellet based on the coupling of heat and mass transfer characteristics and component reaction kinetics

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  • Huang, Dexin
  • Song, Gongxiang
  • Gong, Zhijie
  • Xu, Jun
  • Xu, Kai
  • Jiang, Long
  • Wang, Yi
  • Su, Sheng
  • Hu, Song
  • Xiang, Jun

Abstract

Fast pyrolysis of biomass pellets is an effective means of large-scale utilization of biomass resources. This paper simulated and predicted the fast pyrolysis weight loss behavior of biomass pellets by using a comprehensive model coupling the temperature-varying thermal properties as well as the stepwise reaction mechanism of three biomass components. Results showed that the heat transfer limitation caused by temperature-varying thermal properties increased the inner-particle temperature difference from 288 °C to 376 °C under the heating rate of 100 °C/min when considering heat transfer characteristics, and the difference was more obvious at higher heating rates. Compared with one-step reaction kinetics, adopting the three-component stepwise reaction kinetics reduces the average simulation error of pyrolysis at 100 °C/min from 4.42 % to 0.68 %. Furthermore, based on the optimized three-component five-reaction model, the TG curves at low heating rates are used to predict the TG results at higher heating rates. The deviation of the TG curves at 200–500 °C/min for the same biomass predicted by the kinetic parameters at 100 °C/min was less than 1 %. With the introduction of ash content correction, the model can also be used to predict the behavior of different biomass species with an error of less than 2 %.

Suggested Citation

  • Huang, Dexin & Song, Gongxiang & Gong, Zhijie & Xu, Jun & Xu, Kai & Jiang, Long & Wang, Yi & Su, Sheng & Hu, Song & Xiang, Jun, 2025. "Numerical simulation and prediction of fast pyrolysis behavior of biomass pellet based on the coupling of heat and mass transfer characteristics and component reaction kinetics," Energy, Elsevier, vol. 318(C).
    • Handle: RePEc:eee:energy:v:318:y:2025:i:c:s0360544225005523
    DOI: 10.1016/j.energy.2025.134910
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    References listed on IDEAS

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