In summer

installing the spray humidification system in air-cooled condenser unit has become selection of the most power plants in northern China.However

some problems still exist

like local high temperature at the bottom of air-cooled unit

which causes poor effect of the spray.Thus

on the basis of the actual operation data

a three-dimensional model for a 600 MW unit was established.Through changing the conventional mechanical ventilation method to swirling ventilation

the effect of spray humidification system on heat transfer characteristics of air-cooled unit under swirling ventilation with straight blade was simulated.The result shows that the effect of spray humidification under swirling ventilation is obviously better than that under the conventional mechanical ventilation.