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).
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)