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On the Mathematical Modelling of a Moving-Bed Counter-Current Gasifier Fuelled with Wood-Pellets

Author

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  • Andreas Schwabauer

    (Institute of Energy Process Engineering and Fuel Technology, Clausthal University of Technology, Agricolastr 4, 38678 Clausthal-Zellerfeld, Germany)

  • Marco Mancini

    (Institute of Energy Process Engineering and Fuel Technology, Clausthal University of Technology, Agricolastr 4, 38678 Clausthal-Zellerfeld, Germany)

  • Yunus Poyraz

    (Institute of Energy Process Engineering and Fuel Technology, Clausthal University of Technology, Agricolastr 4, 38678 Clausthal-Zellerfeld, Germany)

  • Roman Weber

    (Institute of Energy Process Engineering and Fuel Technology, Clausthal University of Technology, Agricolastr 4, 38678 Clausthal-Zellerfeld, Germany)

Abstract

The subject of this work is the mathematical modelling of a counter-current moving-bed gasifier fuelled by wood-pellets. Two versions of the model have been developed: the one-dimensional (1D) version-solving a set of Ordinary Differential Equations along the gasifier height-and the three-dimensional (3D) version where the balanced equations are solved using Computational Fluid Dynamics. Unique procedures have been developed to provide unconditionally stable solutions and remove difficulties occurring by using conventional numerical methods for modelling counter-current reactors.The procedures reduce the uncertainties introduced by other mathematical approaches, and they open up the possibility of straightforward application to more complex software, including commercial CFD packages. Previous models of Hobbs et al., Di Blasi and Mandl et al. used a correction factor to tune calculated temperatures to measured values. In this work, the factor is not required. Using the 1D model, the Mandl et al. 16.6 kW gasifier was scaled to 9.5 MW input; the 89% cold-gas efficiency, observed at 16.6 kW input, decreases only slightly to 84% at the 9.5 MW scale.

Suggested Citation

  • Andreas Schwabauer & Marco Mancini & Yunus Poyraz & Roman Weber, 2021. "On the Mathematical Modelling of a Moving-Bed Counter-Current Gasifier Fuelled with Wood-Pellets," Energies, MDPI, vol. 14(18), pages 1-24, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5840-:d:636144
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    References listed on IDEAS

    as
    1. Scholz, Reinhard & Beckmann, Michael & Pieper, Christoph & Muster, Marc & Weber, Roman, 2014. "Considerations on providing the energy needs using exclusively renewable sources: Energiewende in Germany," Renewable and Sustainable Energy Reviews, Elsevier, vol. 35(C), pages 109-125.
    2. González, William A. & Pérez, Juan F. & Chapela, Sergio & Porteiro, Jacobo, 2018. "Numerical analysis of wood biomass packing factor in a fixed-bed gasification process," Renewable Energy, Elsevier, vol. 121(C), pages 579-589.
    3. Weber, Roman & Gupta, Ashwani K. & Mochida, Susumu, 2020. "High temperature air combustion (HiTAC): How it all started for applications in industrial furnaces and future prospects," Applied Energy, Elsevier, vol. 278(C).
    4. Lech Nowicki & Dorota Siuta & Maciej Markowski, 2020. "Carbon Dioxide Gasification Kinetics of Char from Rapeseed Oil Press Cake," Energies, MDPI, vol. 13(9), pages 1-12, May.
    5. Lech Nowicki & Dorota Siuta & Maciej Markowski, 2020. "Pyrolysis of Rapeseed Oil Press Cake and Steam Gasification of Solid Residues," Energies, MDPI, vol. 13(17), pages 1-12, August.
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    Cited by:

    1. Marco Mancini & Andreas Schwabauer, 2023. "On the Thermal Stability of a Counter-Current Fixed-Bed Gasifier," Energies, MDPI, vol. 16(9), pages 1-36, April.

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