Electrostatic precipitator (ESP) is a kind of dust removal equipment in which dust particles are ionized by high voltage electric field and charged by dust particles. Under the action of electric field force, dust particles are deposited on the electrode, so that dust particles and dust gases are separated. It can effectively recover the dust in the gas to purify the gas. The dust removal efficiency can reach 99% or even higher under suitable conditions. At present, it has been widely used in chemical industry, thermal power generation, cement, metallurgy, paper making and electronics, etc.