with double-in-double-out ball pulverizing mill and positive-pressure direct-fired pulverizing system
has exploded many times since it is put into operation
imperiling to the safety and stability of the boiler.The main causes are that velocity of primary air is too low when turn on and turn off the pulverizing system and coal level in ball mill is too high.According to analysis
several operation control keynotes in pulverizing system are presented and fire-protection logic in pulverizing mill is added.