排气管偏置分离器分离性能的数值模拟

Numerical simulation of separation performance in cyclone with excentric vent pipe

采用雷诺应力模型(Reynolds stress model,RSM)对旋风分离器排气管中置和偏置时的气相流场进行了数值模拟,并用拉格朗日法模拟了分离器内颗粒的运动轨迹。气相流场模拟结果与实验结果吻合得较好。结果表明:排气管偏置后,分离器内沿排气管偏置方向的切向速度有所提高,排气管下部短路流较小,颗粒离心运动更加强烈,提高了分离效率的同时压降变化不大,分离器经济性更好。

The Reynolds stress model（RSM）was used to predict the gas flow of two cyclones with different vent pipe locations,and particle paths were calculated with the stochastic Lagrangian model.The calculated gas flow field was in reasonable agreement with experiment data.The numerical simulation results indicated that when the vent pipe was excentric,the cyclone obtained greater tangential velocity around the vent pipe,smaller shortcut flow,stronger trend of particles＇ centrifugal motion and almost unchanged pressure drop of the cyclone,which resulted in higher collection efficiency and better economical efficiency.