不同排尘结构对导叶式旋风管内气固两相流动影响的数值研究  

Numerical study on gas-solid two-phase flow in guide vane cyclone tube with different dust discharge structure

作　　者：王建军[1] 谭慧敏[1] 许伟伟[1] 王新华[1] 金有海[1] 

机构地区：[1]中国石油大学(华东)机电工程学院多相流分离实验室,山东东营257061

出　　处：《化工学报》2010年第9期2257-2264,共8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资助项目(09CX04027A)~~

摘　　要：通过数值模拟的方法对3种不同排尘结构的导叶式旋风管内气固两相流场进行了研究。结果表明,直筒型排尘结构的排尘口处上、下行流交错容易产生返混夹带现象,对细颗粒的分离不利;锥形排尘结构可以增加旋风管内气流旋转强度,控制进入灰斗的下行气量,有利于分离效率的提高,但排尘锥内部存在环形旋涡,易磨损器壁;在排尘锥侧面开缝,可改善旋风管内流动分布状态,实现排尘区气固两相分流,进入灰斗内的气流更加稳定,从而有效减少颗粒返混夹带,提高旋风管分离性能。The gas-solid two-phase flow in the guide vane cyclone tube with different dust discharge structure is studied by numerical simulation method.The studies show that the downward flow and upward flow pass through the same discharge section of the cylinder type discharge structure,so the upward flow may entrain fine particles from the hopper and result in poor performance of the cyclone.With the cone shape discharge structure,the gas flow rotation in the cyclone is improved and the downward flow can be controlled,which is helpful to obtain better performance.However,vortex flow is found in the discharge cone,which will cause flow erosion to the wall of cyclone tube.The opening slots in the wall of discharge cone can change the state of gas-solid two-phase flow,which give different paths for discharge flow and upward flow,stabilize the flow in the hopper,avoid the entrainment of particles from the hopper,so that the performance of cyclone tube is improved.

关 键 词：旋风管 排尘结构 气固两相流 

分 类 号：TQ051.8[化学工程]