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3D Eulerian-Eulerian modeling of a screw reactor for biomass thermochemical conversion. Part 1: Solids flow dynamics and back-mixing

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  • Shi, Xiaogang
  • Ronsse, Frederik
  • Roegiers, Jelle
  • Pieters, Jan G.

Abstract

Three-dimensional (3D) computational fluid dynamics (CFD) simulations were performed to study solids flow dynamics and solids back-mixing behavior in a screw reactor (designed for thermal conversion of dry biomass particles) based on the Eulerian-Eulerian method. Simulation results were compared against experimental data with respect to filling degree and mean residence time of particles. The mean deviations for filling degree and for mean residence time between simulation and experiment were about 0.01 and 11.4 s, respectively, which shows that the model is reasonably accurate in predicting solids flow behavior in the screw reactor. The solids flow dynamics inside the reactor were discussed. The solids residence time distribution (RTD) was calculated and the degree of solids back-mixing in the forward transportation direction of the reactor was analyzed. It was found that solids being flung over the shaft and solids back-leakage, resulting from the low solids forward transportation velocity at the clearance between the flight and the bottom shell of the screw reactor, were responsible for solids back-mixing. The degree of solids back-mixing can be reduced at higher screw rotating speeds when keeping inlet mass flow rate of solids constant.

Suggested Citation

  • Shi, Xiaogang & Ronsse, Frederik & Roegiers, Jelle & Pieters, Jan G., 2019. "3D Eulerian-Eulerian modeling of a screw reactor for biomass thermochemical conversion. Part 1: Solids flow dynamics and back-mixing," Renewable Energy, Elsevier, vol. 143(C), pages 1465-1476.
    • Handle: RePEc:eee:renene:v:143:y:2019:i:c:p:1465-1476
    DOI: 10.1016/j.renene.2019.05.098
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    References listed on IDEAS

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    1. Chen, Wei-Hsin & Peng, Jianghong & Bi, Xiaotao T., 2015. "A state-of-the-art review of biomass torrefaction, densification and applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 44(C), pages 847-866.
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    2. Stanisław Ledakowicz & Olexa Piddubniak, 2023. "Temperature Distribution in a Finite-Length Cylindrical Channel Filled with Biomass Transported by Electrically Heated Auger," Energies, MDPI, vol. 16(17), pages 1-23, August.
    3. Stanisław Ledakowicz & Olexa Piddubniak, 2022. "The Non-Stationary Heat Transport inside a Shafted Screw Conveyor Filled with Homogeneous Biomass Heated Electrically," Energies, MDPI, vol. 15(17), pages 1-16, August.
    4. Rezapour, Mojtaba & Gholizadeh, Mohammad, 2021. "Analysis of methanol thermochemical reactor with volumetric solar heat flux based on Parabolic Trough Concentrator," Renewable Energy, Elsevier, vol. 180(C), pages 1088-1100.
    5. Thoharudin, & Hsiau, Shu-San & Chen, Yi-Shun & Yang, Shouyin, 2022. "Numerical modeling of biomass fast pyrolysis by using an improved comprehensive reaction scheme for energy analysis," Renewable Energy, Elsevier, vol. 181(C), pages 355-364.

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