The centrifugal classifier of HP1003 type medium speed coal pulverizer in one power plant has been retrofitted into a rotary classifier

and the performance test being carried out

so as to make clear about the influence of rotary classifier's rotation speed upon some main parameters of the coal pulverizer

i.e.the fineness of pulverized coal

the uniformity index of pulverized coal

the electric current and ventilation resistance of coal pulverizer etc..Results of test show that the optimal rotation speed of rortary classifier was 80 r/min for coal-feed amount being 48 t/h and 40 t/h

and the optimal rotation speed was 70 r/min for coal-feed amout being 30 t/h.After retrofitting into rotary classifier

the adjustable range of coal fineness has increased

and the apportioning uniformity of pulverized coal amoung the conveying branch pipes from outlet of the coal pulverizer has improved obviously.