The problems occurred in operation of ZGM113G medium speed coal pulverizers installed for 600 MW unit in Hebi Fenghe Power Plant

such as vibration

low loading pressure

insufficient output capacity

coal blockage

and leakage of pulverized coal etc.

have been presented.Analysis shows that the vibration is related to coal quality and thickness of the coal layer;the low loading force is resulted from failure to operate the solenoid valve

and affecting the output capacity;the coal blockage in coal pulverizer and leakage of pulverized coal are caused by small air flow rate and low pressure of the sealing air.