CFD study on gas-solid flow characteristics in CCSI system: A comprehensive analysis of particle residence and dispersion

Lingjie Zhang, Huimin Yang, Jiao Jin, Shengxiao Wu and Feng Wu

Energy, 2025, vol. 320, issue C

Abstract: The Coal to Coal-tar and Semi-coke to Syngas Integrated Technology (CCSI) has great potential due to its energy-saving and emission-reduction benefits. However, its industrial application is hindered by limited understanding of its internal fluid dynamics. This study employs the CPFD method to investigate fluid dynamics within the system, focusing on the effects of inlet velocity on particle residence time and dispersion coefficients, as well as the impact of loosening air ratio on particle flow in the conical region. The results show that: Increasing gas velocity reduces particle residence time, but exceeding 14.54 m/s worsens flow uniformity and intensifies back-mixing. The axial dispersion coefficient increases with gas velocity, while radial dispersion is governed by particle fluidization quality. With a 330 m3/h inlet flow and 20 % loosening air ratio, the conical region achieves optimal gas velocity and particle distribution, minimizing back-mixing.

Keywords: Circulating fluidized bed; Gas-solid flow; Efficient coal utilization; CPFD method (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:320:y:2025:i:c:s0360544225010977

DOI: 10.1016/j.energy.2025.135455

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