Abstract:
Bubbles play an important role on the hydrodynamics and chemical reaction characteristics of gas-solid fluidized bed reactor. In this study, the computational fluid dynamics (CFD) approach was used to simulate the hydrodynamics and chemical reaction model of potassium bicarbonate (KHCO3) solid sorbents in the downer section of a bubbling fluidized bed reactor. The Eulerian Eulerian model is used this study. This model consists of mass, momentum and energy conservation equations for gas-solid phase. The simulation results were validated by comparing the hydrodynamic result with the literature experiment by Taghipour et al. and Liu et al. Then, the effect of operating parameters including temperature, gas velocity, particle size and bed height were explored using 2k experimental design approach. The response parameters in this study were the bubble sizes and CO2 molar concentration. From the results, the gas velocity, particle size and interaction between gas velocity and particle size had significant affected on bubble size at 95% confidence level. The small bubble can be obtained when gas velocity was operated at the low level and particle size was operated at the high level. The operating parameters that had an effect on CO2 molar concentration were temperature, gas velocity and interaction between temperature and gas velocity in at 95% confidence level. The high regeneration can be obtained when temperature was operated at the high level and gas velocity was operated at the low level. The obtained results can be used for efficiently designing and operating of this kind of gas-solid bubbling fluidized bed reactor.