The continuous crystallization process was numerically simulated by coupling CFD-PBM(computational fluid dynamics and population balance model).QMOM was employed to solve the coupled PBE.When nucleation,growth,coalescence and breakage were considered,the number of grids for numerical simulation were determined by the grid independence verification.Then the effect of baffle installment,residence time,rotating speed and impeller type on the CSD evolution was investigated.The results show that the turbulence intensity is improved by setting up the baffle in the crystallizer.Smaller particle size is obtained with high rotational speed and low residence time.Finally,comparing the CSD from three impellers,the axial flow propeller shows to be lower power consumption and suitable for crystallization with large particle size,while radial disc turbine propeller can be selected to obtain microparticle crystal.
关键词
连续结晶/数值模拟/粒数衡算方程/积分矩方法/晶体粒径分布
Key words
continuous crystallization/numerical simulation/population balance equation/quadrature method of moment/crystal size distribution
维普
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