固液分离旋流器壁面磨损的数值模拟

基于计算流体力学(CFD)方法, 应用Fluent软件中雷诺应力模型和离散相模型, 对重分散相颗粒分离旋流器壁面的磨损情况进行了模拟研究。结果表明, 旋流分离器壁面的磨损以局部磨损为主;在入口环形区域, 颗粒对壁面的主要磨损为冲击磨损;在圆筒体和圆锥体区域, 颗粒对壁面的主要磨损为磨削磨损;磨损最严重的部位在旋流分离器的底流口。入口环形空间磨损最严重的位置在圆周方向上100°~110°;圆柱筒体壁面的磨损成螺旋向下的带状分布;越接近锥体末端, 圆锥体壁面的磨损越严重, 在底流口处达到磨损峰值。旋流分离器内部颗粒浓度高的部位磨损严重;同时入口速度增加, 旋流分离器壁面各个部位的磨损率也会相应增大。这些结果为旋流分离器的设计及应用提供了一定的指导。

Numerical simulation of the wall attrition in solid-liquid hydrocyclones

Based on CFD method, the wall attrition of hydrocyclones for the separation of dispersed phase particles was simulated using the Reynolds stress model and discrete phase model in Fluent software. Results showed that the main attrition on the hydrocyclone wall was local attrition. In the annular region of the entrance, the main attrition was shock attrition. In the region of the cylinder and cone, the main attrition was grinding attrition. The most worn part was near the underflow port. The most worn part of the annular space of the entrance ranged from 100°to 110°in circumferential direction. The distribution of the attrition on the surface of the cylinder body wall was a downward spiral banding. The attrition was more serious on the cone wall to the end of the cone. And the peak attrition appeared at the underflow port. In the solid-liquid hydrocyclone, the attrition on the wall was more serious where the particle concentration was higher. The attrition rate increased with increasing feed velocity. The results can provide certain guidance to the design and application of hydrocyclone separator.