摘要
旋风分离器放大效应显著,是影响其分离效率和压降的重要因素。利用ANSYS软件,对经过几何相似放大的筒体直径分别为80、150、240、320、450和1 000 mm的α型旋风分离器进行数值模拟,气相采用RSM模型,颗粒相采用DPM模型。结果表明:旋风分离器尺寸按几何相似放大后,在相同进口气速下,随着旋风分离器筒径的增大,切向速度、静压和湍动能均呈增大趋势;轴向速度分布由倒V形变为倒W形,不利于颗粒的分离。颗粒运动数值模拟与分离效率试验结果均表明:α型旋风分离器经过几何相似放大,筒体直径越大,颗粒运动轨迹更加紊乱,分离效率越低;旋风分离器放大效应对直径20μm以上颗粒分离效率的影响不大,对直径10μm以下颗粒的分离效率影响显著。
The cyclone separator has significant enlargement effects which are an important factor affecting its separation efficiency and pressure drop. ANSYS software was used to simulate the α type cyclone separators whose cylinder diameter respectively were 80, 150, 240, 320, 450 and 1 000 mm after geometric similar enlargement, and RSM model was applied to gas phase and DPM model was applied to particle phase in simulation. The results showed: after the cyclone separator enlarging in the light of geometric similarity, at the same inlet gas velocity, with the increase in the diameter of the cyclone separator, the tangential velocity, static pressure and turbulent kinetic energy increased, while the distribution of axial velocity changed from V type to inverted W type, which was not helpful for particle separation. The results of numerical simulation of particle motion and the test for separation efficiency showed: after the α type cyclone separator enlarging in the light of geometric similarity, the larger the cylinder diameter was, the more disordered particle motion trajectory was, the lower the separation efficiency was;the enlargement effects of the cyclone separator had little influence on the separation efficiency of particles whose diameter more than 20 μm, while had significant influence on that of particles whose diameter less than 10 μm.
作者
范军领
王超
冯胜科
陈光辉
FAN Junling;WANG Chao;FENG Shengke;CHEN Guanghui(School of Electromechanical Engineering,Qingdao University of Science&Technology,Qingdao 266042,Shandong,China;Beijing Aerospace Petrochemical EC&EP Technology Corporation Limited,Beijing 100084,China;School of Chemical Engineering,Qingdao University of Science&Technology,Qingdao 266042,Shandong,China)
出处
《矿山机械》
2020年第6期49-54,共6页
Mining & Processing Equipment
基金
山东省重点研发计划(公益类科技攻关)(2019GSF109038)。
关键词
数值模拟
颗粒运动过程
两相流
旋风分离器
筒体直径
numerical simulation
particulate motion process
two-phase flow
cyclone separator
cylinder diameter
