| Summary: | 碩士 === 中原大學 === 機械工程學系 === 87 === This study of particle motion characteristics and collection performance affected by the effect of electric winds of the electrostatic precipitators is proposed. The electric field in the single-stage electrostatic precipitators is a nonuniform distribution and effect of electric winds and turbulent field are very complicated. Therefore, the analysis of the nonuniform electric field is performed and the effect of electric winds for flow field and particles would be discussed in detail.
The governing equation in this study is based on the momentum equation and the flow field under nonuniform electric field is considered. The poisson equation of electric field is obtained by complex transformation, and lower Reynolds number model is used in a turbulent model. The PHOENICS code is adopted to determine the effect of flow field of the electric winds in the electrostatic precipitators. In addition, Lagrangain model is appiled to indicate the particle trajectories. The motion of particles can be observed in the electrostatic precipitators after chargeing. The parameters of influences including inertial force, viscous drag force and electrophoresis force. Hence, effects of charged particles, electric winds and turbulence for the collection performance can be clarified.
The result shows that the effects of electric winds for the flow field is not apparent under a high Reynolds number, and the collection performance will be the same. When Reynolds number decreases, the effect of electric winds will increase. In flow field, it exists a electric winds recirculation flow region. In addition, charged particle has a greater influence in collection performance. When particle is charged increasingly, its electric force will also be increased, and particle will deposit on precipitation plate easier.
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