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.
Bibliographical noteFunding Information:
This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (No. 20164030201250). This work has also been supported by the BK21 Plus program through the National Research Foundation (NRF) funded by the Ministry of Education of Korea (20164030201250).
© 2017 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)