Electrostatic Precipitator

The working principle of electrostatic precipitator is to use the high voltage electric field to make the flue gas ionization, and the dust charge in the air stream is separated from the air flow under the electric field. The negative electrode is made of a metal lead with different cross section shape, called the discharge electrode. The positive electrode is made of metal plates of different shapes, called the collector electrode. The performance of the electrostatic precipitator is influenced by the dust property, the structure of the device and the gas flow velocity. The specific resistance of dust is an indicator of electrical conductivity, which has a direct influence on the efficiency of dust removal. The specific resistance is too low, the dust particles are difficult to keep on the collector electrode, causing it to return to the air. The specific resistance is too high, the dust charge is not easy to be released, and the voltage gradient between the dust layer can produce the local breakdown and discharge phenomena. These conditions will result in the decrease of dust removal efficiency.