Effect of Modeling Parameters on System Hydrodynamics of Air Reactor in Chemical Looping Combustion Using CFD Simulation

The system hydrodynamics or flow behavior of gas and solid particles was simulated using computational fluid dynamic (CFD) model inside air reactor of chemical looping combustion (CLC). The two fluid model or Euler-Euler model was selected to use together with the kinetic theory of granular flow model (KGTF). In this study, the effect of modeling parameters including drag coefficient model, specularity coefficient and restitution coefficient between solid particles were explored. The EMMS drag model gave the highest solid volume fraction inside the system due to the particle cluster assumption in the model development. The specularity coefficient and restitution coefficient between solid particles had slightly effect on the results. In addition, the obtained results were compared with literature experiment by Shuai et al. (2012). The radial profiles of solid concentration from CFD simulation were consistent with the experimental data. The conventional core-annulus flow structure was still observed in the air reactor. (C) 2014 INT TRANS J ENG MANAG SCI TECH.