导叶式旋风管排尘口处颗粒返混夹带现象  

Back mixing of particles in guide vane separator

作　　者：谭慧敏[1] 王建军[1] 亓成刚[1] 金有海[1] 

机构地区：[1]中国石油大学(华东)机电工程学院,山东东营257061

出　　处：《化工学报》2011年第3期716-722,共7页CIESC Journal

基　　金：教育部重点项目(109159);中央高校基本科研业务费专项资金(09CX04027A);中国石油大学研究生创新基金项目~~

摘　　要：通过数值模拟的方法,研究导叶式旋风管内颗粒返混夹带现象。研究表明,排尘口下方存在明显的灰斗返混现象,颗粒返混质量流率占入口颗粒质量流率的38%,排尘锥内部颗粒返混夹带量占入口颗粒流率的47%;排尘口上方1.1D(D为旋风管直径)范围是主要的二次分离空间,最终影响分离效率的返混颗粒仅占入口颗粒质量流率的2.5%;13μm以下的返混颗粒会对分离器总效率产生影响,粒径越小,影响作用越明显。The CFD method was employed to simulate the back mixing of particles in a guide vane separator based on the Reynolds stress model（RSM）and the discrete particle model（DPM）.The results show that the back mixing of particles is serious at the bottom of the dust discharge,which contains 38% of the total mass of particles.The mass flow rate of back mixing of particles in the dust discharge is 47% of the total mass flow rate.The back mixing of particles decreases sharply at 1.1D above the dust discharge,where D is the diameter of cyclone.The particle back mixing that affects cyclone efficiency is only 2.5% of total inlet mass flow rate of particles.The particles smaller than 13 μm affect the total efficiency.Smaller particles result in more significant influence.

关 键 词：颗粒 返混夹带 排尘口 旋风管 

分 类 号：TQ051.8[化学工程]