Wet electrostatic precipitator Basic principle and dry type Electrostatic precipitator Basically the same, they all go through three stages: feeding, collection and ash removal. Dry and wet flue gas environments are different. The DC high-voltage voltage ionizes the space gas near the cathode line, and the dust particles move under the action of the electric field force and deposit on the surface of the dust collecting anode. Dry electrostatic precipitator (ESP) removes dust through strong vibration, and wet electrostatic precipitator (WESP) removes dust through water film or washing. Wet electrostatic precipitator It is an electrostatic precipitation method that separates aerosols and suspended dust particles in the gas. It mainly includes the following four complex and interrelated physical processes:

(1) Ionization of gases.

(2) Condensation and charging of aerosols and suspended dust particles.

(3) Charged dust particles and aerosols move towards the electrode.

(4) The water film makes the plate clean.

Apply tens of thousands of volts DC high-voltage electricity between the anode and cathode lines of the wet electrostatic precipitator, under the action of a strong electric field, to produce a corona layer around the corona line. The air in the corona is ionized by avalanches, producing a large number of negative ions and a small number of positive ions. The dust (fog) particles entering the wet electrostatic precipitator together with the flue gas collide with the positive and negative ions, and the charged dust (fog) particles move towards the anode under the Coulomb force of the high-voltage electrostatic field. After reaching the anode, the charge is released and dust (fog) particles are collected by the anode. Dust is collected to form a water film, which is separated from flue gas by gravity or from the upper part of drainage tank or absorption tower.