Electrostatic precipitators are widely used in removing even very small dirt particles, cleaning the air and dedusting gases of various origin. Electrostatic precipitators use a simple but extremely effective technology based on the principle of electrostatic precipitation. What exactly is the principle of electrostatic precipitators? Where do they apply?
How do electrostatic precipitators work?
Electrostatic filters, using the principle of electrostatic precipitation, clean the air of even very small impurities. Dirt particles are electrically neutral, so they must be properly electrified.
The first stage of air purification is passing through a metal mesh separator, which mechanically removes larger impurities. Further, the air with dust passes to the electric field section. Electrostatic precipitators are equipped with two electrodes - a discharge one and a collecting one. The discharge electrodes are powered by DC 20 kV. Particles in a strong electric field receive a positive electric charge. The ionized particles pass into the collector section towards a negatively charged collecting electrode on which they settle.
The removal of filtered impurities occurs when the particles give off their charge on contact with the surface of the collecting electrode. Then they fall into the hopper, from where they are scooped and removed to the external tank. This way of getting rid of pollution is a huge plus of electrostatic filters. There is no need to change filters (unlike most air purifiers).
Application of electrostatic precipitators
Electrostatic precipitators are widely used in:
- boilers fired with coal dust in the power industry;
- dedusting the waste gases from from sintering raw materials in metallurgy;
- dedusting gases from the conversion of copper matte in metallurgy;
- dedusting raw coke oven gas;
- dedusting volatile gases from rotary kilns in cement plants;
- kitchen extracts;
- removal of smoke and vapors in welding works;
- cooling emulsions;
- removing small particles (10 microns and smaller).