The Lagrangian discrete phase simulations and analysis have been carried out for three dimentional geometric model of the coal pulverizer

the movement regularity of coal particles with different particle size being obtained at different rotation speed of the classifier

and then the influence of particle size concerning coal in the pulverizer and throat size of the rotary classifier upon the separation efficiency has been studied.Through enlarging the throat size

the separation efficiency and coal fineness distribution have been improved without increasing the pressure loss in coal pulverizer.