(117b) Investigation of the Complex Gas-Solids Flow Characteristics in a Fluidized Bed with Multi-Cyclone Separators System By Process Tomography and CPFD Simulation
To verify and optimize the measurement result, computational fluid dynamic (CFD) based on the kinetic theory of granular flow (KTGF) is used to investigate the flow characteristics in the same bed. Different drag models, i.e. the energy-minimization multi-scale (EMMS) model, Wen-Yu and Gidaspow model, are used to investigate the gas-particle interface effect on the flow characteristics. Key process parameters, including the solids concentration, solids velocity and pressure drop, are analyzed and verified by the measured results. Both the CFD simulation and tomography measurement results provide valuable information to reveal the hydrodynamic characteristics in the Wurster type fluidized bed. With the lab-scale fluidized bed, the results of Wen-Yu and Gidaspow drag models have a good agreement with the ECT measurement. The results also indicate that the design of the Wurster tube has significant effects on the flow. Based on the CFD simulation and ECT measurement results, optimized parameters are chosen to improve the solids circulation efficiency and coating quality.
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