SLK涡流选粉机重力分级区内颗粒的运动特性

Particle Characters in the Gravitational Classification Zone of the SLK Classifier

选粉机内颗粒的重力分级对后续离心分级有重要影响。为研究颗粒在选粉机重力分级区内的运动特性,在对颗粒进行受力分析的基础上,分别建立y向和x向颗粒运动方程,通过理论分析探索了颗粒在y向和x向的运动特性。运用计算流体力学理论,考察重力分级区内气流速度在y向和x向的变化规律,研究不同粒径颗粒的运动轨迹。结果表明,重力分级区内气流速度在y向上递增,颗粒在y向做速度不断增大的变加速运动;气流速度在x向上由返料锥近壁端向远壁端递减,颗粒在x向做速度不断减小的变减速运动。研究结果可为选粉机的设计提供理论参考和数据基础。

The particle gravitational classification process is one of the important factors affecting the centrifugal classification performance of a classifier. To understand the particle motion characters in the gravitational classification zone of the classifier, anSLK5500 classifier is chosen as the object, and particle motion equations are built in the y direction and x direction by analyzing the action forces on the particle. And theoretical analysis is made to explore particle characters in the y and x directions on the basis of the particle motion equations. According to the computational fluid dynamics theory, the changing rules of gas velocities in the y and x directions of the gravitational classification zone are investigated, and particle trajectories of different diameters are studied. The theoretical analysis and simulation result show that in the gravitational classification zone, the gas velocity increases progressively in the y direction, where particle motion is a variable acceleration motion with an increasing acceleration; the gas velocity decreases from the return cone near wall terminal to the far wall, and the particle motion in the x direction is a variable acceleration motion with a decreasing acceleration. This research has provided a reference and data for the classifier structure design.