U-Beam惯性分离器的三维数值模拟

3D Numerical Simulation of U-Beam Inertia Separator

为降低CFB(循环流化床)锅炉引风机电耗,用商业软件研究了U-Beam惯性分离器的三维流场和气固分离性能。模拟结果对比后选择了Reynolds-Stress模型。研究发现:U-Beam顶部存在抑制颗粒分离的顶棚效应;U-Beam底部存在底部效应强化颗粒分离;U-Beam气固分离器存在确定的运行风速,使得分离器压力系数最小;大部分粉尘颗粒在前2排U-Beam分离下来。模拟结果揭示了UBeam惯性分离器分离效率低的原因是U-Beam内具有较强的湍流波动。

3D Flow field and gas-solid separation performance of U-Beam inertia separator has been simulated with commercial software in order to decrease power consumption of CFB boiler induced-draft fan. Reynolds-Stress model is selected after comparing the results of 3D simulation,which shows as followings. There is a upwind effect at upper part of UBeam; There is a bottom effect enhancing particle separation; There is a certain operation air speed in U-Beam gassolid separator that gives the lowest pressure coefficient; Most of dust particle has been separated from the first 2 row U-Beam. These results reveal that the reason why U-Beam inertia separator has the lower separating efficiency is due to a stronger turbulent fluctuation within U-Beam.