淘析器内颗粒运动轨迹的数值模拟

Numerical simulation of particle moving behavior in elutriator

采用FLUENT6.2提供的标准,κ-ε模型和随机轨道模型模拟新型惯性撞击式淘析器内的颗粒运动轨迹,预测不同粒径颗粒的运动轨迹和速度分布。结果表明:通过在淘析区加入格栅板,使大颗粒在器内的运动路径变长,与格栅的碰撞促使粘附在粗颗粒表面上的细粉分离;加长对流段还有利于提高粒料中离散细粉尘的分离。工业规模实验验证了模拟结果。

The particle moving paths in a new type elutriator had been simulated based on the standard K-ε model and Stochastic Tracking model provided by FLUENT6. 2. 16. The moving paths and velocity distribution of two size particles were predicted. The numerical simulation results showed that the traveling distances of large particles in the new elutriator become longer than the old elutriator without guided grid trays, which enhance the separation of fine and coarse particles. The collision impact force of grid to large particles caused the fine dust adhered on the surface of coarse particles detached finally and hereby get a top-quality granular product. This numerical simulation results had been proved by industrial scale test.