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该文应用基于离散相模型的拉格朗日粒子跟踪多相流方法,对某种工业流化床内复杂物料气力筛分过程进行了数值仿真分析。采用等效椭球粒子模拟复杂物料,通过Rosin-Rammler粒径分布函数和圆球变形系数的重构来引入物料组分的物理属性差异,通过与实验数据对比获得特殊边界上多孔介质模型参数,数值计算了设定气动参数范围内的物料运动和筛分现象,分析了气动参数和结构参数对物料流动现象的影响,并对流化床结构进行优化,获得了复杂物料良好气力筛分的仿真预报。
In this paper, a Lagrangian particle-tracking multi-phase flow method based on discrete phase model is applied to the numerical simulation of the pneumatic screening of complex materials in an industrial fluidized bed. Equivalent ellipsoidal particles are used to simulate complex materials. The differences of physical properties of material components are introduced through the Rosin-Rammler particle size distribution function and spherical deformation coefficient reconstruction. By comparing with the experimental data, the porous medium model parameters are obtained. Numerical calculation of material movement and screening in the range of aerodynamic parameters was carried out. The influence of aerodynamic parameters and structural parameters on the flow of material was analyzed. The fluidized bed structure was optimized and a good aerodynamic screening of complex materials was obtained forecast.