Directing against problems of large hot air leakage and high temperature inside the coal pulverizer after its shutdown

a retrofit scheme of additionally installing pneumatic slide plate gate into air-mixing duct at inlet of the coal pulverizer has been put forward

to use the pressure difference between hot and cold air at the inlet of coal pulverizer for sealing the hot air.Results of test show that the temperature inside the coal pulverizer has decreased from 56 ℃ to 28 ℃

and the air leakage amount has reduced from 20.88 t/h to 9.32 t/h after shut-down of the coal pulverizer

enhancing the boiler's efficiency

having remarkable energy-saving effect.