The working principle of electrostatic precipitator is to use high voltage electric field to ionize the flue gas, and the dust in the gas stream is charged and separated from the gas stream under the action of electric field. The negative electrode is made of metal wires with different cross-sectional shapes, called discharge electrode. The positive electrode is made of metal plates with different geometrical shapes and is called the dust collection electrode. The performance of electrostatic precipitator is affected by three factors such as the nature of dust, equipment construction and flue gas flow rate. Specific resistance of dust is an index for evaluating electrical conductivity, which has a direct influence on dust removal efficiency. Specific resistance is too low, dust particles are difficult to maintain in the dust electrode, resulting in its return to the gas flow. Specific resistance is too high, the dust particles to reach the dust electrode charge is not easy to discharge, the formation of a voltage gradient between the dust layer will produce local breakdown and discharge phenomenon. All these situations will cause a decrease in dust removal efficiency.
