Four MPS-89 G type medium speed coal pulverizers were equipped for each boiler of 2×350 MW units in Huaneng Dandong Power Plant

retrofit of hydraulic loading system for coal pulverizers had been carried out for 2A and 2B coal pulverizers in 2006

the original constant loading by using springs being retrofitted into automatic variable loading.After retrofitting

the loading force of rollers in coal pulverizer can be automatically adjusted according to variation of the raw coal quantity at inlet of the puvlerizer

the adoptability for coal sorts being greatly increased

not only ensuring the fineness of pulverized coal

but also eliminating un-safe phenomena

such as vibration frequently occurred on the coal pulverizer under constant loading mode

as well as breakage of the loading rod etc.Through optimization of hydraulic loading force and its performance curve

the unit consumption of coal pulverizer has been decreased

enhancing the economic efficiency of coal-pulverizing system.