离心浮选机结构对流场影响的数值模拟  

Numerical simulation on the effect of centrifugal flotation machine structure on flow field

作　　者：魏月友 孙姣[1,2] 陈文义[1,2] 

机构地区：[1]河北工业大学化工学院,天津300130 [2]河北工业大学工程流动与过程强化研究中心,天津300130

出　　处：《河北工业大学学报》2015年第1期50-54,65,共6页Journal of Hebei University of Technology

基　　金：河北省自然科学基金(E2012202109)

摘　　要：为探讨浮选机结构对流场的影响,对整体浮选机流场的分布特性进行了数值模拟.以自吸式离心浮选机为模型,使用计算流体动力学软件STAR CCM＋,运用Realizable k-湍流模型和VOF多相流模型,采用SIMPLE算法对速度和压力进行耦合求解,得到了速度、压力、湍动能以及气液相含率的分布规律.模拟结果表明,吸气量、喷嘴出口动能和湍动能值随喷嘴直径增大而减小,当喷嘴直径为19 mm时效果较好.外筒体流场存在较大的速度梯度,速度值从7-8 m/s降至1 m/s以下.矿化气体在外筒体的弥散程度较低,入料初始阶段气含率均一度仅为20%-30%.In order to discuss the effect of the structure of Centrifugal flotation machine on the flow field, the flow field distribution in whole flotation machine was investigated using STAR CCM＋. A Realizable k- turbulent and VOF multiphase model were employed to simulate the present model, and the SIMPLE algorithm was used to acquire the pressurevelocity coupling solution. The simulation results indicate that inspiratory capacity, nozzle outer velocity and Turbulent Kinetic Energy decreased by increasing nozzle outer diameter, and the better nozzle diameter was 19 mm. High velocity gradient existed in outer flotation cell, from 7 - 8 m/s down to 1 m/s or less. The dispersion of mineral laden bubbles in outer cell was relatively low, and at the initial stages it was only 20% - 30%.

关 键 词：STAR CCM+ 离心浮选机 喷嘴 全流场 数值模拟 

分 类 号：TD456[矿业工程—矿山机电]