MPS180-HP-Ⅱ medium-speed wheel mill was used in one power plant. Analysis is aimed at the abnormalities of pebble coal discharge during the operation of the pulverizer

such as the outlet temperature of the separator higher

the larger opening degree of the cold wind gate

and the rougher fineness of the coal powder

etc. The main reason is that the inlet air volume of the pulverizer is large and the primary air speed is high. After reducing the amount of air once it lead to a large amount of pebble coal discharge. On this basis

the paper puts forward the transformation plan of the pulverized coal nozzle. The configuration of the primary air speed measuring device has been modified and calibrated. After the transformation and milling system optimization

operation security and economy is improved.