微型循环流化床的CFD-DEM模拟  

CFD-DEM Investigation of a Micro-Circulating Fluidized Bed

作　　者：房明明[1] 罗坤[1] 杨世亮[1] 张科[1] 樊建人[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《工程热物理学报》2015年第3期545-550,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.50976098;No.51176170)

摘　　要：快速流态化是颗粒材料工业处理过程中的重要工艺手段,在各领域中都有极广泛应用。本文利用计算流体力学—离散单元方法(CFD-DEM),对典型快速流态化装置一微型流化床内的复杂气固流动现象进行尝试性模拟,模拟结果真实地还原了流化床内各个组件内复杂的气固流动特性。在此基础上,对装置内气固时均速度场、时均空隙率分布等进行了分析。发现这些统计量在入口和出口附近都有明显的波动变化,颗粒时均速度沿轴线呈反"C"型分布,装置结构对气固流动特性有重要影响。fast fluidization is an important technical approach in industrial processing of granular materials,which is widely applied in all industrial fields.In this paper,a trial is carried out using a computational fluid dynamics-discrete element method(CFD-DEM) to numerically reproduce the complex gas-solid flow behaviors in a micro-circulating fluidized bed.Numerical results reveal the typical gas-solid flow patterns in all parts of the bed.Based on this,time-averaged velocity and voidage distribution of the bed is analyzed.It is found that these statistics show clear variations in the vicinity of bed inlet and outlet,and a counter 'C' distribution of time-averaged solid velocity along the riser axis is spotted.The facility structure has a crucial influence on the gas-solid flow features.

关 键 词：循环流态化 微型流化床 旋风分离器 CFD-DEM 

分 类 号：TQ051.13[化学工程]