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Comparative scaling analysis of two different sized pilot-scale fluidized bed reactors operating with biomass substrates

Author

Listed:
  • Cardoso, J.
  • Silva, V.
  • Eusébio, D.
  • Brito, P.
  • Hall, M.J.
  • Tarelho, L.

Abstract

This paper presents a comparative scaling analysis of two different sized pilot-scale fluidized bed reactors operating with biomass substrates. A multiphase Eulerian-Eulerian 2-D mathematical model was implemented, coupled with in-house user-defined functions (UDF) built to enhance hydrodynamics and heat transfer phenomena. The model validation was attained by comparison to experimental data gathered from both reactors. A grid refinement study was carried out for both geometries to achieve an appropriate computational domain. Hydrodynamics was deeply studied for both reactors concerning the scale-up effect. Mixing and segregation phenomena, solid particle distribution and biomass velocity were matters of great concern. Results showed that UDF implementation successfully minimized deviations and increased the model’s predictability. The largest deviations measured between experimental and numerical results for syngas composition were of about 20%. Solids mixing and segregation was found to be directly affected by the particles size, density, and superficial gas velocity, with the larger reactor revealing improved mixing ability. Improved mixing occurred for smaller particles size ratio (dbiomass = 3 mm), smaller particles density ratio (ρbiomass = 950 kg/m3), and higher dimensionless superficial gas velocities (U0/Umf=3.5). The larger unit showed an increase in near-wall velocity, lateral dispersion, and bubble size. As for the smaller reactor, higher velocities were obtained at the center region due to a more pronounced wall boundary layer. Similarities were found between the two reactors regarding the bubble distribution, dimensionless average bed pressure drop and biomass velocity vector profiles when dimensionless parameters were employed.

Suggested Citation

  • Cardoso, J. & Silva, V. & Eusébio, D. & Brito, P. & Hall, M.J. & Tarelho, L., 2018. "Comparative scaling analysis of two different sized pilot-scale fluidized bed reactors operating with biomass substrates," Energy, Elsevier, vol. 151(C), pages 520-535.
    • Handle: RePEc:eee:energy:v:151:y:2018:i:c:p:520-535
    DOI: 10.1016/j.energy.2018.03.090
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    References listed on IDEAS

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    1. Bello, Yusuf H. & Ahmed, Mahmoud A. & Ookawara, Shinichi & Elwardany, Ahmed E., 2022. "Numerical and experimental investigation on air distributor design of fluidized bed reactor of sawdust pyrolysis," Energy, Elsevier, vol. 239(PC).
    2. Yang, Shiliang & Wang, Hua & Wei, Yonggang & Hu, Jianhang & Chew, Jia Wei, 2019. "Eulerian-Lagrangian simulation of air-steam biomass gasification in a three-dimensional bubbling fluidized gasifier," Energy, Elsevier, vol. 181(C), pages 1075-1093.
    3. Fan, Feihu & Zheng, Min & Yang, Shiliang & Wang, Hua, 2021. "Numerical study of fluid dynamics and heat transfer property of dual fluidized bed gasifier," Energy, Elsevier, vol. 234(C).
    4. Wan, Zhanghao & Yang, Shiliang & Wei, Yonggang & Hu, Jianhang & Wang, Hua, 2020. "CFD modeling of the flow dynamics and gasification in the combustor and gasifier of a dual fluidized bed pilot plant," Energy, Elsevier, vol. 198(C).
    5. J. R. Copa & C. E. Tuna & J. L. Silveira & R. A. M. Boloy & P. Brito & V. Silva & J. Cardoso & D. Eusébio, 2020. "Techno-Economic Assessment of the Use of Syngas Generated from Biomass to Feed an Internal Combustion Engine," Energies, MDPI, vol. 13(12), pages 1-31, June.
    6. Yang, Shiliang & Wan, Zhanghao & Wang, Shuai & Wang, Hua, 2020. "Computational fluid study of radial and axial segregation characteristics in a dual fluidized bed reactor system," Energy, Elsevier, vol. 209(C).

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