Experiments on operating characteristics of high load MPS pulverizers during different wear periods were carried out.The regulation characteristics of main operating parameters of this type of pulverizers with different degrees of roller wear were investigated in detail

and suggestions on practical operations were put forward.Thus

the optimal operation mode of the pulverizer with roller wear at different degrees was given.Combining with theoretical calculations

the operation characteristic parameters of the pulverizer during different wear periods were compared to instruct the actual operation.The results show that

with wearing test coals

the air volume features

separator damper features and load force features of the grinding wear at the early

middle and last stage were basically the same.In the early wear stage

the coarse coal amount is relatively low.In the middle wear stage

the coarse coal amount decreases.In the last wear stage

the coarse coal amount increases

especially under high output conditions.In the middle and last wear stages

the electricity consumption increases

and with an increase in the mill output

the effect of wear on electricity consumption decreases.