关键词: 选粉机, 分级过程, 数值模拟, 非稳态

Abstract: In order to study the classification process of particles in the classifier SLK5500，CFD numerical simulations for eddy current classifier under both steady and unsteady states were conducted. The simulations were based on theoretical analysis for the granules of force. Particle trajectory and classification efficiency were investigated in the steady state simulation. Particle real-time motion law was investigated in the unsteady state simulation. Results showed that the particles classification processes are random events. Smaller particles were more possible to go fine powdered state than into the coarse particle state，vice versa.

Key words: classifier, hierarchical process, numerical simulation, unsteady