Chinese Journal of Chemical Engineering ›› 2021, Vol. 29 ›› Issue (1): 375-382.doi: 10.1016/j.cjche.2020.09.032

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Pyrolysis of single large biomass particle: Simulation and experiments

Kai Wang, Huiyan Zhang, Sheng Chu, Zhenting Zha   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
  • Received:2020-06-14 Revised:2020-08-03 Online:2021-01-28 Published:2021-04-02
  • Contact: Huiyan Zhang
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (Grand No. 2019YFD1100602); the National Natural Science Fund for Excellent Young Scholar of China (Grant No. 51822604); the National Natural Foundation of China (Grand No. 51676045); and the Natural Science Fund of Jiangsu Province for Distinguished Young Scholar (Grand No. BK20180014).

Abstract: Pyrolysis and heat transfer characteristics of single large biomass particle were investigated using three-dimensional unsteady heat transfer model coupled with chemical reactions. The consumption of biomass and the production of products were simulated. Some experiments were designed to provide model parameters for simulation calculations. The simulation was verified by pyrolysis experiments of large biomass particle in a vertical tube furnace. The simulation results show the internal heat and mass transfer law during the pyrolysis of large biomass particle. When the biomass particle diameter is between 10 and 30 mm, for every 5 mm increase in particle diameter, the time required for complete pyrolysis will increase on average by about 50 s. When the pyrolysis temperature is between 673 K and 873 K, a slight decrease in the pyrolysis temperature will cause the time required for the biomass to fully pyrolyze to rise significantly. And the phenomenon is more obvious in the low temperature range. The results indicate that the numerical simulation agrees well with the experimental results.

Key words: Pyrolysis, Large biomass particle, Simulation, Heat/mass transfer