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Particle-scale numerical investigation of oxy-fuel combustion in a circulating fluidized bed

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  • Bi, Zhichen
  • Chen, Yuyang
  • Yang, Shiliang
  • Hu, Jianhang
  • Wang, Hua

Abstract

Oxy-fuel combustion in CFBs is a viable pathway for carbon dioxide capture, but the complex in-furnace flow is still not well understood. This study develops a MP-PIC reactive model incorporating polydispersity and thermochemical effects, and validates it against experiments. Particle-scale analysis of a 0.1 MWth CFB reveals that density and size segregation lead to coal accumulating in the upper loop seal. The mean slip velocity of coal (∼5 m/s) is higher than that of sand particles (∼4.3 m/s), indicating greater solid transport intensity for coal. The dispersion coefficient of coal particles is about 0.0213, 0.0081, and 0.4602 m2/s while those of sand particles are about 0.0020, 0.0016, and 0.2298 m2/s in x, y, and z directions, respectively. An early peak featuring a lengthy tail appears for solid residence time distribution. The mean temperature of coal is about 1020 K, lower than that of sand about 1100 K. Sand particles show a gentle change in temperature and their mean heat transfer coefficient is 260 W/(m2·K). Oxygen concentration shows a positive effect on the temperature evolution and composition contents while the height of the feeding port and primary-to-secondary airflow ratio have a negligible effect. Increasing the oxygen concentration and the airflow ratio increases the ash content along with the bed height.

Suggested Citation

  • Bi, Zhichen & Chen, Yuyang & Yang, Shiliang & Hu, Jianhang & Wang, Hua, 2025. "Particle-scale numerical investigation of oxy-fuel combustion in a circulating fluidized bed," Energy, Elsevier, vol. 335(C).
    • Handle: RePEc:eee:energy:v:335:y:2025:i:c:s0360544225038216
    DOI: 10.1016/j.energy.2025.138179
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