靜電除塵器(EP)電場作用下之粉塵行徑模式研究

Abstract

In this study, a Computational Fluid Dynamics (CFD) model for description of operation of electrostatic precipitators (EP) has been developed. Next, considered five discharge electrodes in the geometry configuration, the discharge electrode wire-to-wire distance is 500 mm, and placed between two collecting electrodes having 300 mm spacing between them. Afterward simulated the particle trajectories in the Electrostatic Precipitator within different inlet flow velocity (1m/s, 1.5 m/s), particles diameter(5μm, 50μm), particles permittivity(5.1, 10) and different applied voltage (56 kV, 63 kV). Results showed that the EP efficiency is increased for larger particle diameter, particle permittivity and applied voltage. Such as the particles diameter (dp) from 5μm to 50μm for er=5.1 and V0 =63 kV, the particle charge can be improved about 80 times. Particles permittivity (er) from 5.1 to 10, the particle charge can be advanced about 16%. Applied voltage (V0) from 56 kV to 63kV for dp=5μm and er=5.1, the particle charge can be increased about 10%. Finally, if the charged particles are accumulated on the collecting electrode that can probably result in Back Corona. This paper will calculate the effect of current density on collecting electrode(J), electric potential(V), and electric field intensity(E) while Back Corona occur. KEYWORDS: Electrostatic Precipitator; Numerical analysis; particle trajectory, back corona