指状挡板对轴流式搅拌釜内固液悬浮影响的数值模拟  

Numerical simulation of the finger baffle effect on the solid-liquid suspension in axial stirred tank

作　　者：付双成[1] 桂挺 袁惠新[1] 朱杭 贾俊贤 

机构地区：[1]常州大学机械工程学院江苏省绿色过程装备重点实验室,江苏常州213164

出　　处：《石油化工》2017年第12期1507-1513,共7页Petrochemical Technology

基　　金：2013年度"江苏省博士后科研资助计划"(1302172C)

摘　　要：采用数值模拟的方法研究对比了轴流式搪玻璃搅拌釜内两种不同挡板(法兰挡板和指状挡板)下的固液悬浮特性。模拟结果表明,指状挡板增强釜底的流体流动,是更有利于固液悬浮的挡板形式,且其指状部分有引导流体流动的作用,使流场流动更加"紊乱",强化了流场混合效果。固含量较高时,指状挡板的强化流场作用更加明显;固含量较低时,固体颗粒的密度对固液悬浮和流场混合的影响较大。随着颗粒密度的增大,安装常规的搅拌釜釜底固相沉积体积分数增大,安装指状挡板的搅拌釜的混合时间延长。The numerical simulation method is used to study and compare the characteristics of solid-liquid suspension in two kinds of axial glass-lined reactor with different baffles. By comparing the simulation results, the flow at the bottom is enhanced with the finger baffle which is more conducive to the solid-liquid suspension. The finger part guided fluid flow to make the flow more ＂disorganized＂ to strengthen the flow mixing effect. When the liquid has a higher solid content, it is obviously that it enhanced the flow field of the finger baffle. When the liquid has lower solid content, the density of the solid particles has a greater impact on the mixing of the solid liquid and the flow field. The greater density, the bigger volume fraction of solid deposition stirred at the bottom of the tank with the conventional flange baffle and more mixing time in the reactor with the finger baffle.

关 键 词：数值模拟 指状挡板 搅拌 固液悬浮 

分 类 号：TQ051[化学工程]