不同高度旋风分离器内气固流动的数值模拟  

Numerical Simulation on Gas-Solid Flow in Cyclone Separators with Different Heights

作　　者：熊斌 卢啸风[2] XIONG Bin;LU Xiao-feng(Chongqing Engineering Research Center of Automobile Dynamic Property Measurement;School of Power Engineering,Chongqing University)

机构地区：[1]重庆市汽车动力系统测试工程技术研究中心 [2]重庆大学动力工程学院

出　　处：《电站系统工程》2024年第5期11-13,16,共4页Power System Engineering

摘　　要：为了深入研究旋风分离器高度对其性能的影响,对3种不同高度旋风分离器内的气固流动进行了数值模拟。气相湍流采用雷诺应力模型(Reynolds stress model,RSM),并用拉格朗日法计算颗粒的运动轨迹、分离效率和气相流场的计算结果与试验结果基本吻合。相比于分离器A,高度增加的分离器B和C的分离效率最大提高了13%和22%,但是压降却逐渐减小。分离器高度增加,气相的切向速度略有减小,但向下轴向速度增加,向心径向速度减小,仍然有利于提高分离效率。同时,分离器高度越高,气相湍流强度、短路流及排尘口附近偏心的纵向环流越小,也有利于分离效率的提高。Numerical simulations of gas-solid flow in three cyclones of varying heights were performed to fully study the effect of cyclone height on its performance.The Reynolds stress model(RSM)was used to simulate the gas flow field,while the Lagrangian model was used to calculate the particle trajectory.The collection efficiency and gas flow field obtained by numerical simulation are comparable with the experimental results.As compared to cyclone A,cyclones B,and C with higher heights have a maximum improvement in collection efficiency of 13%and 22%respectively.However,the pressure drop reduces gradually.The tangential velocity of gas flow decreases slightly as the cyclone's height rises,but it increases the downward axial velocity and decreases the radial velocity,which is still advantageous for increasing collection efficiency.In addition,the increased collection efficiency with rising cyclone height is also attributed to lower turbulence intensity,smaller shortcut flow,and smaller eccentric circumfluence near the dust outlet.

关 键 词：旋风分离器 高度 气固流动 数值模拟 

分 类 号：TQ051.8[化学工程]