Analysis of the Electric Field in a Cylindrical Type Electrostatic Precipitator : Shift of Discharging Electrode

According to the change of social situation, air pollution has been kept strict order. Electrostatic precipitator (EP) has been of great use because its efficiency is higher than that of other kinds of precipitator, and so it is necessary to develop a more efficient, lower cost and smaller EP than usual ones. To develop EP satisfied these requirement, an analysis of the electric field strength in EP is important. To the present, the knowledge of the electric field strength in individual EP has been only experimentally achieved. For a nonlinear field, a theoretical analysis is impossible. However the advance of computers enabled to do a successive calculation and it became possible to calculate the electric field strength in EP using computer simulation. In this paper, we aimed at the establishment of a calculation method for the electric field strength distribution in the cylindrical EP (not co-axial). The current density on the cylindrical electrode was measured with small electrodes, so that the boundary conditions of the space charge density were determined. On the other hand, the electric field was measured by the method of Steel-Ball-dropping and the property of this calculation was investigated. The electric field strength values calculated by the method of successive approximation agreed well with the measured values within 20% error (average 10% error) in the cases that the displacement of the discharge electrode from the center of the external cylinder is 1cm or 3cm and applied voltage is 25kV or 30kV. As a result, it might be concluded that this calculation method is applicable to the analysis of the electric field strength in cylindrical EP.