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

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

Energy, 2025, vol. 335, issue C

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.

Keywords: Oxy-fuel combustion; Heat and mass transfer; Solid residence time; Numerical simulation (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:335:y:2025:i:c:s0360544225038216

DOI: 10.1016/j.energy.2025.138179

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