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Numerical analysis of hydrodynamics and thermochemical property of biomass gasification in a pilot-scale circulating fluidized bed

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  • Wan, Zhanghao
  • Hu, Jianhang
  • Qi, Xianjin

Abstract

This study presents a three-dimensional reactive multiphase particle-in-cell (MP-PIC) model to simulate the hydrodynamics and thermochemical property of the biomass gasification process in a pilot-scale circulating fluidized bed gasifier. The bed hydrodynamics and thermochemical characteristics are investigated, together with discussing the effects of operating conditions on the species distribution, lower heating value (LHV), and combustible gas concentration (CGC). The results show that solid particles present oscillation behaviors for the time elapsed at the turbulent fluidization regime. Solid flux and rising velocity have peaks of about 249 kg/(m2·s) and 6.2 m/s in the core region of the bed, respectively. Increasing the gasification temperature reduces the CGC from 15.85% to 15.16%. However, only the concentration of H2 increases with the enlargement of the steam biomass ratio. Comparatively, the equivalence ratio (ER) has the most direct impact on gasification efficiency, and the increase of the ER adversely affects the LHV and CGC. The effect of particle diameter on the LHV, the magnitude of which can cover a range from 3.87% to 3.98%, is negligible compared with the other operational parameters, at least for the specific cases in the present investigation.

Suggested Citation

  • Wan, Zhanghao & Hu, Jianhang & Qi, Xianjin, 2021. "Numerical analysis of hydrodynamics and thermochemical property of biomass gasification in a pilot-scale circulating fluidized bed," Energy, Elsevier, vol. 225(C).
    • Handle: RePEc:eee:energy:v:225:y:2021:i:c:s036054422100503x
    DOI: 10.1016/j.energy.2021.120254
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    2. Lin, Junjie & Luo, Kun & Wang, Shuai & Sun, Liyan & Fan, Jianren, 2022. "Particle-scale study of coal-direct chemical looping combustion (CLC)," Energy, Elsevier, vol. 250(C).
    3. Han, X.C. & Xu, H.J. & Zhao, C.Y., 2022. "Design and performance evaluation of multi-layered reactor for calcium-based thermochemical heat storage with multi-physics coupling," Renewable Energy, Elsevier, vol. 195(C), pages 1324-1340.
    4. Zepeng Sun & Yazhuo Wang & Jing Gu & Haoran Yuan & Zejian Liu & Leilei Cheng & Xiang Li & Xian Li, 2023. "CFD Simulation and Experimental Study on a Thermal Energy Storage–Updraft Solid Waste Gasification Device," Energies, MDPI, vol. 16(12), pages 1-33, June.
    5. 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).
    6. Danai Frantzi & Anastasia Zabaniotou, 2021. "Waste-Based Intermediate Bioenergy Carriers: Syngas Production via Coupling Slow Pyrolysis with Gasification under a Circular Economy Model," Energies, MDPI, vol. 14(21), pages 1-37, November.
    7. Wan, Zhanghao & Yang, Shiliang & Hu, Jianhang & Wang, Hua, 2023. "Catalyst-scale investigation of polydispersity effect on thermophysical properties in a commercial-scale catalytic MTO fluidized bed reactor," Energy, Elsevier, vol. 262(PA).

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