The structure and working principle of ZXF rotating classifier was described.The static baffle separator applied on MBF-23 type coal mill was retrofitted to the ZXF rotating classifier.Experiments were conducted before and after the improvement.The results showed that

increasing the coal quantity

the coal fineness at outlet of the static separator would be larger and that at the ZXF rotating classifier outlet would be smaller

indicating the rotating classifier had more obvious regulating effect on coal fineness.The uniformity of pulverized coal was dramatically improved.When the coal fineness R75 was 22.2%

the electric consumption of retrofitted coal pulverizer was obviously reduced by 0.5(kW·h)/t

which was 7.28(kW·h)/t.