Electrostatic precipitators, electrostatic precipitators range of applications: used in coal-fired power plants, metallurgy, building materials, chemical industry, paper industry, industrial furnaces and industrial process flue gas dust removal, the major efficient dust removal equipment. , Electrostatic precipitators working principle of electrostatic precipitator works by using high voltage electric field to ionize the flue gas, the flow of dust charged under the electric field and the flow separation. Made negative by the different cross-sectional shape of the metal wire, called the discharge electrode. A positive electrode made by the different geometries of the metal plate, called the collecting electrode. 1, the process of ionization of the gas to pass between two specific electrode to the high voltage DC and create an electric field, so that the voltage exceeding the critical voltage of the electrode system, so that the ionization of the gas generating corona discharge. Within a small range around the discharge electrode, the electric field strength is strong enough to ionize the gas. A corona discharge electrode near the corona zone, the area within the range of about 2 ~ 3mm away from the discharge electrode surface. In this region, due to the discharge electrode surface has a sufficiently high electric field strength, so that the ionization of the gas to produce a large number of positive ions and electrons. In this case, if the discharge electrode is applied to the negative voltage, generating a negative corona discharge, the electron moves to the positive electrode and the positive ions toward the discharge electrode itself. 2, when a dust particle charging process electrostatic baghouse work, due to the ions or electrons generated by the corona region into the outer zone of the corona, and with neutral molecules collide, so that the dust particles charged. The charge quantity of the size and the particle size of dust particles, the electric field strength, ion energy and the duration and other factors are relevant. Usually we think that the dust particles charged two mechanisms: the electrical charge and diffusion of charged. The former is due to the electric field, ions and dust particles collision, adhesion to the charged dust particles. The latter is due to the irregular thermal motion of the ions, the gas diffusion and collision of dust particles, adhesion, so that the dust particles charged. 3, the dust collection process after the dust charged, under the influence of an electric field in accordance with the self-contained charge polarity opposite to the polarity of the electrode movement and deposited on the surface of the electrode. The dust is usually perpendicular to the velocity of the plate called the driving speed. The size of the driving speed and the dust charge quantity, the speed of the electric field and gas properties and other factors. Negatively charged dust collecting electrode contact lost immediately after the charge be neutral particles adhered to the surface of the electrode. Then the electrode by means of a vibration device jitter dust particles shed from the surface of the electrode, fall into the the electrostatic bag filter lower part of the set hopper is cleared. Third, the characteristics of the electrostatic precipitator electrostatic bag filter are compared with other desulphurization and dust removal equipment, energy consumption, dust, high efficiency, suitable for removing flue dust of 0.01-50μm, and can be used for high temperature flue gas, the pressure occasion. Practice shows that the amount of flue gas treatment, the greater the economic, investment and operating costs using an electrostatic bag filter.