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Biomass pyrolysis in fully-developed turbulent riser flow

Author

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  • Beetham, S.
  • Capecelatro, J.

Abstract

This work presents a numerical study of biomass pyrolysis in turbulent riser flow. Eulerian–Lagrangian simulations of unbounded sedimenting gas-solid flows are performed to isolate the effects of particle clustering on the production of syngas and tar. This configuration provides a framework to resolve the relevant length- and time-scales associated with thermal, chemical and multiphase processes taking place in the fully-developed region of a circulating fluidized bed riser. A four-step kinetic scheme is employed to model the devolatilization of biomass particles and secondary cracking of tar. Two-way coupling between the phases leads to clusters of sand particles that generate and sustain gas-phase turbulence and transport biomass particles. Neglecting the heterogeneity caused by clusters was found to lead to a maximum over-prediction of syngas yield of 33%. Further, it was found that two-dimensional simulations over-predict the level of clustering, resulting in an under-prediction of syngas and tar yields.

Suggested Citation

  • Beetham, S. & Capecelatro, J., 2019. "Biomass pyrolysis in fully-developed turbulent riser flow," Renewable Energy, Elsevier, vol. 140(C), pages 751-760.
    • Handle: RePEc:eee:renene:v:140:y:2019:i:c:p:751-760
    DOI: 10.1016/j.renene.2019.03.095
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    Cited by:

    1. Ullah, Atta & Hong, Kun & Gao, Yanan & Gungor, Afsin & Zaman, Muhammad, 2019. "An overview of Eulerian CFD modeling and simulation of non-spherical biomass particles," Renewable Energy, Elsevier, vol. 141(C), pages 1054-1066.

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