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An Investigation of the Restitution Coefficient Impact on Simulating Sand-Char Mixing in a Bubbling Fluidized Bed

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  • Xinjun Zhao

    (School of Energy and Power Engineering, Beihang University, Beijing 100191, China)

  • Qitai Eri

    (School of Energy and Power Engineering, Beihang University, Beijing 100191, China)

  • Qiang Wang

    (School of Energy and Power Engineering, Beihang University, Beijing 100191, China)

Abstract

In the present work, the effect of the restitution coefficient on the numerical results for a binary mixture system of sand particles and char particles in a bubbling fluidized bed with a huge difference between the particles in terms of density and volume fraction has been studied based on two-fluid model along with the kinetic theory of granular flow. Results show that the effect of restitution coefficient on the flow characteristics varies in different regions of the bed, which is more evident for the top region of the bed. The restitution coefficient can be categorized into two classes. The restitution coefficients of 0.7 and 0.8 can be included into one class, whereas the restitution coefficient of 0.9 and 0.95 can be included into another class. Moreover, four vortices can be found in the time-averaged flow pattern distribution, which is very different from the result obtained for the binary system with the similar values between particles in density and volume fraction.

Suggested Citation

  • Xinjun Zhao & Qitai Eri & Qiang Wang, 2017. "An Investigation of the Restitution Coefficient Impact on Simulating Sand-Char Mixing in a Bubbling Fluidized Bed," Energies, MDPI, vol. 10(5), pages 1-14, May.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:5:p:617-:d:97415
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    References listed on IDEAS

    as
    1. M. A. Mohd Salleh & Nsamba Hussein Kisiki & H. M. Yusuf & W. A. Wan Ab Karim Ghani, 2010. "Gasification of Biochar from Empty Fruit Bunch in a Fluidized Bed Reactor," Energies, MDPI, vol. 3(7), pages 1-9, July.
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    Cited by:

    1. Bjørn H. Hjertager, 2017. "Engineering Fluid Dynamics," Energies, MDPI, vol. 10(10), pages 1-2, September.
    2. Heng Wang & Zhaoping Zhong, 2019. "A Mixing Behavior Study of Biomass Particles and Sands in Fluidized Bed Based on CFD-DEM Simulation," Energies, MDPI, vol. 12(9), pages 1-16, May.

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