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High-fidelity investigation of thermochemical conversion of biomass material in a full-loop circulating fluidized bed gasifier

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  • Yang, Shiliang
  • Liang, Jin
  • Wang, Shuai
  • Wang, Hua

Abstract

Olive oil production urges the energy companies to exploit the potential of the residues as biomass fuels for clean energy production. Circulating fluidized bed (CFB) gasifier gains global interest within these several years due to its promising solution for converting biomass material to renewable energy. However, the multi-physics processes and multiscale structures inside the gasifier impede the experimental measurements. As an alternative, a reactive multiphase particle-in-cell approach is developed in this work to simulate the gasification process of olive oil waste in a pilot-scale full-loop CFB gasifier. After the model validation, the heat transfer properties of solid phase and the effect of size-induced segregation on solid thermochemical properties are explored. The results show that the low-temperature biomass particles injected highly influence the spatial distribution of solid temperature and solid heat transfer coefficient (HTC). A larger particle size gives rise to a higher HTC. Moreover, the temperature and HTC of biomass are larger than that of sand. A wide and narrow residence time distribution of sand in the riser and cyclone can be observed. The scale of biomass dispersion is respectively larger and the same as that of sand in horizontal and vertical directions. Particles in the dense region have a smaller HTC, Reynolds number, and temperature. Superficial gas velocity improves the uniformity of solid distribution. Elevating the gas velocity and initial bed temperature enhances solid dispersion intensity.

Suggested Citation

  • Yang, Shiliang & Liang, Jin & Wang, Shuai & Wang, Hua, 2021. "High-fidelity investigation of thermochemical conversion of biomass material in a full-loop circulating fluidized bed gasifier," Energy, Elsevier, vol. 224(C).
  • Handle: RePEc:eee:energy:v:224:y:2021:i:c:s036054422100342x
    DOI: 10.1016/j.energy.2021.120093
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