Device and method for removing PM 2.5 from smoke

The invention discloses a device for removing PM 2.5 from a smoke. The device is characterized in that: the device comprises a removing tower, a wet electrical dust precipitator and one or more wetting spray apparatuses; the lower part of the removing tower is provided with a smoke inlet end; the smoke inlet end of the removing tower is provided with a particle charging zone and a mixing coagulation zone; the particle charging zone is divided into a positive corona discharging zone and a negative corona discharging zone; an anode is arranged in the positive corona discharging zone; a cathode is arranged in the negative corona discharging zone; at least one stage of wetting spray apparatus is arranged in the removing tower which is above the smoke inlet end; the wet electrical dust precipitator is arranged in the removing tower which is above the wetting spray apparatus; and the top of the removing tower is provided with a smoke outlet. The invention also discloses a method for removing PM2.5 from the smoke. The method sequentially comprises steps of particle charging, mixing coagulation, dust wetting tempering, and wet electrical precipitation. The device and the method have the following advantages: fine dust PM2.5 can be removed from fire coal; fine particles of acid mist, heavy metal particles and the like can be removed from the smoke; and the PM2.5 removal rate is equal to or greater than 95%.