Numerical study on the flow features of U-beam inertial separator

Detailed parametric study of three-dimensional gas-particle multiphase flow characteristics in U-beam tube bundle inertial separators was conducted by numerical simulation. The carrier phase was treated in the Eulerian frame, the particles were tracked in the Lagrangian frame, and particle-wall collision was considered. Simulation carried out at different inflow rate and mass loading ratios revealed the pressure losses in the separators, velocity field of the gas phase, and the trajectories of particles. The study results revealed the multiphase flow-dynamic features of the separators, and the relationship between separator pressure losses and different inlet velocity. The numerical simulation can provide basis both for optimal design of impacting-inertial separator used in circulating fluidized bed boiler; and for study of gas-particle multiphase circumfluence flow.

U-Beam惯性分离器的三维数值模拟

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。