Four MPS-89G type medium speed coal pulverizors have been installed for a 1150 t/h boiler in second-phase project of Huaneng Dalian Power Plant

in order to enhance the adaptability to coal sort variation

the original damper type classifier has been demolished

and a new type classifier being installed for the A coal pulverizor.Taking Shanxi Dayou coal as the test coal

the performance test has been carried out under different capacity of the coal pulverizer.In the test

the runing curves of said pulverizor

which has to meet the requirement of coal fineness

were determined.If the coal sort changed

these curves can be adjusted to ensure the fineness of pulverized coal.The results show that the new classifier of coal pulverizor boasts the ability of adjusting fineness of pulverized coal in real-time according to the operation situation of boiler.However

as the more finely pulverized coal comes from the outlet of said classifier

the unit energy consumption rate of coal pulverizor will increase a little.