Jisheng Environmental Engineering Co

Electrostatic precipitator
Hebei professional team Jisheng Environment
Working principle of electrostatic precipitator
Gas ionization process
High-voltage direct current is passed between two specific electrodes to establish an electric field , causing the voltage of the electrode system to exceed the critical voltage, ionizing the gas and generating corona discharge. The electric field intensity in a small range around the discharge electrode is strong enough to ionize the gas. After corona appears, the corona area near the discharge electrode is within a range of approximately ~ from the surface of the discharge electrode. In this area, due to the high enough electric field intensity on the discharge electrode surface, the gas is ionized and a large number of positive ions and electrons are generated. At this time, if a negative voltage is applied to the discharge electrode, a negative corona discharge is generated, and the electrons move to the positive electrode and the positive ions move to the discharge electrode itself.
Dust particle charging process
As the ions or electrons generated in the corona area enter the outer area of the corona and collide with neutral molecules, the dust particles are charged. The size of the charge is related to factors such as the particle size of the dust particles, the strength of the electric field, the thermal energy of the ions, and the residence time. Usually we think that there are two mechanisms for dust particle charging, namely electric field charging and diffusion charging. The former is due to the collision of ions with dust particles under the action of the electric field, and the charge attached to the dust particles. The latter is due to the irregular thermal motion of ions, gas diffusion, collision and adhesion with dust particles, causing the dust particles to be charged.
Dust collection process
After the dust is charged, under the action of the electric field, it moves toward the electrode with the opposite polarity according to the polarity of the self-carrying charge, and is deposited on the surface of the electrode. The moving speed of dust perpendicular to the pole plate is usually called the driving speed. The size of the driving speed is related to factors such as the charge amount of the dust, electric field velocity, gas properties and other factors. After the negatively charged dust comes into contact with the dust collection electrode, it immediately loses its charge and becomes neutral particles that adhere to the surface of the electrode. Then the vibration device is used to cause the electrode to vibrate, and the dust particles fall off the surface of the electrode and fall into the ash collecting hopper at the bottom of the electrostatic precipitator to be continuously removed.