摘要
为深入研究JJF型浮选机的流场特性及气泡分布均匀性,基于标准k-ε湍流模型和Euler-Euler双流体模型,结合CFD理论对气-液两相流流场特性进行数值模拟,研究了JJF-0.2m^(3)自吸气浮选机的速度场、压力场、气含率以及气泡分布均匀性。模拟结果表明:转子转速提高,平均气含率随之提升,形成的气泡越多;气相、液相的速度矢量图基本一致,沿中心转轴呈对称式分布,混合流体流动形成大范围的涡流,形成的气泡更多;槽内压力主要集中在竖筒与循环筒上,内部存在较大的周向流,转子区域压力降低,转子使用寿命增加;转子区域的气含率随着高度的增加而增加,达到最大值后逐渐降低并趋于稳定,达到稳定状态下的气含率分布均匀且对称,气泡分布均匀且对称,转子与定子区域的气泡在运动过程中与矿浆充分混合,有利于气泡和矿粒间的接触、碰撞和黏附,气泡矿化效果提高,进而可以提高浮选生产效率。
In order to further study the flow field characteristics and bubble distribution uniformity of JJF type flotation machine,based on the standard k-εturbulence model and Euler-Euler two-fluid model,combined with CFD theory,the gasliquid two-phase flow field characteristics were numerically simulated,and the velocity field,pressure field,air volume fraction and bubble distribution uniformity of JJF-0.2 m^(3) self-aeration flotation cell were studied.The simulation results show that with the increase of rotor speed,the average air volume fraction increases and more bubbles are formed.The velocity vector diagrams of gas and liquid phase are basically the same,which are distributed symmetrically along the central axis of rotation.The mixed fluid flows into a wide range of eddy currents and forms more bubbles.The pressure in the groove is mainly concentrated on the vertical cylinder and the circulating cylinder,and there is a large circumferential flow inside,which reduces the pressure in the rotor area and increases the service life of the rotor.Rotor area increases with the increase of height of air volume fraction,after reaching a maximum gradually reduced and tends to be stable,to reach a steady state under the uniform distribution of air volume fraction and symmetrical,uniform and symmetrical,bubble distribution area of the rotor and stator of bubble in the process of movement and pulp mixing,is advantageous to the bubble and ore intergranular contact,collision and adhesion,improve air bubble mineralization effect,So as to improve the flotation production efficiency.
作者
唐军
符东成
刘辉
匡敬忠
于明明
滕瑜崇
TANG Jun;FU Dongcheng;LIU Hui;KUANG Jingzhong;YU Mingming;TENG Yuchong(Faculty of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Gannan University of Science and Technology,Ganzhou 341000,China;Faculty of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《金属矿山》
CAS
北大核心
2021年第12期62-67,共6页
Metal Mine
基金
矿物加工科学与技术国家重点实验室开放基金(编号:GRIMM-KJSKL-2021-01)。
关键词
自吸气浮选机
CFD
气-液两相流
气含率
self-aeration flotation cell
CFD
gas-liquid two-phase flow
air volume fraction
