Computational particle-fluid dynamics simulation of gas-solid flow in a circulating fluidized bed with air or O2/CO2 as fluidizing gas

Mukesh Upadhyay, Hoon Chae Park, Jae Gyu Hwang, Hang Seok Choi, Ha Na Jang, Yong Chil Seo

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Computational particle-fluid dynamics (CPFD) simulation was carried out to examine the influence of air versus O2/CO2 as the fluidizing gas on the hydrodynamics of gas-solid flow in a cold-mode circulating fluidized bed. The CPFD simulation results were compared to the experimental data at constant superficial gas velocity, using air or mixed O2/CO2 in three different concentrations as the fluidizing gas. The simulation results showed that the model successfully captured the experimentally observed trends. A detailed statistical analysis was carried out on the transient pressure data, and results were found to vary depending on whether air or combustion gases (O2/CO2) were used for fluidization. In all cases, the flow exhibits a typical core-annular flow structure, although for O2/CO2 gas the solid volume fraction increases near the wall region. The CPFD results provided insights into the gas-solid flow behavior in a fluidized bed combustor riser under an oxy-fuel fluidizing atmosphere.

Original languageEnglish
Pages (from-to)350-362
Number of pages13
JournalPowder Technology
Publication statusPublished - 2017 Aug


All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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