In order to search the advantages and disadvantages of radial coal classifier

a computational fluid dynamics（CFD） simulation within the discrete phase model（DPM） framework is carried out to investigate the hydrodynamic characters such as flow field

axial and magnitude velocity

pressure drop

particle streamline and so on.The results show that the coarse powder has three separated areas such as the inner side of outer wall

the outer side of inner cone and the inner side of inner wall. The inner cone and the outer shell are easily worn

the particles are easily carried again

the vortex is easily formed in the center tube

and the deviation about coal powder concentration between the two exit tubes is large. The improvement measures such as adding the bump cone on the top of the inlet and introducing the centrifugal block in the inlet are proposed in the paper.