Abstract:Taking the coal pulverizing system of the Fujian Huadian Kemen Power Generation Company Limited project phase I as example, the problems existed in operation process, such as the wear and jam of the pebble coal discharging gate, the air leakage, the pulverized coal leakage and so on, were analyzed. Using the scheme of fullclosed pebble coal discharging system, the pebble coal discharging devices were retrofitted. The above problems were solved, and good effect was obtained.