Comparison Study of the Internal Electric Field and Flow Field of Two-stage and Single-stage Electrostatic Precipitator
The internal electric field and flow field characteristics of electrostatic precipitator(ESP)have important influence on the dust removal performance of ESP.The paper uses Fluent simulation software to numerically simulate single-stage and two-stage ESPs with the same specific dust collection area.The electric field strength and current density distribution of single-stage electrostatic precipitators and two-stage electrostatic precipitators are studied and compared.Meanwhile,the internal flow field changes of single-stage and two-stage electrostatic precipitators are compared by changing the inlet wind speed.Through the above numerical simulation,the influence of electrostatic precipitators on the dust removal efficiency of particles of different particle sizes and the mechanism of two-stage electrostatic precipitators to capture high specific resistivity dust with high efficiency are analyzed.The simulation results show that the current density and electric field intensity in the charged area of two-stage electrostatic precipitator are similar to those in the single-stage electrostatic precipitator.The average plate current density and the average electric field strength of the single-stage electrostatic precipitator are 0.56 mA/m2,2.20 kV/cm,respectively,compared with 0.51 mA/m2,2.40 kV/cm of the two-stage electrostatic precipitator.However,the characteristics of electric field and flow field in the dust-collecting area of two-stage electrostatic precipitator are different from those of single-stage electrostatic precipitator.The average plate current density in the dust-collecting area of two-stage electrostatic precipitator is 0.0036 mA/m2,which is only 0.6% of that of single-stage electrostatic precipitator.The average electric field intensity is 4.0 kV/cm,which is 1.8 times of the field strength of single-stage electrostatic precipitator.Moreover,the flow field in the dust-collecting area of two-stage electrostatic precipitator is evenly distributed and less affected by ion wind.The low current density,high electric field intensity and less ion wind disturbance in the dust collection area are the main reasons why the two-stage electrostatic precipitator can effectively collect high specific resistivity dust and avoid back corona.
万方数据
维普
