Abstract
Electrostatic precipitator (ESP) is widely used for dust removal from flue gas in industry. In the electrostatic precipitation, the electrohydrodynamic secondary flow (EHD) produced by corona ionization has an important influence on the characteristics of particle transport and the collection efficiency of ESP. In this work, a comprehensive ESP model with interaction of multiple physical fields is established to study the EHD effect in ESP. The numerical results show that the EHD generally can increase the streamwise velocity of airflow near the collection plate, which makes the removal performance of ESP worsen. Meanwhile, the EHD has a significant effect on the particle deposition pattern, especially at lower flue gas velocity. When the needle tip of discharge electrode points to the collection plate, the EHD can promote the circulation of airflow near the corona wire, increase the probability of particle charging, and then improve the collection efficiency of ESP.
Highlights
Electrostatic precipitator (ESP) is widely used to purify the flue gas in the thermal power plants
The force driving gas-solid separation just acts on the solid particles; the ESP has the advantages of less energy cost and pressure loss, high collection efficiency, and good applicability for particles with different physical characteristics
Massive free ions resulting from the corona discharge move along the electric line and collide with neutral molecules in the air, which transfers the momentum from ions to neutral molecules, known as electrohydrodynamic secondary flow (EHD) [5,6,7,8,9]
Summary
Electrostatic precipitator (ESP) is widely used to purify the flue gas in the thermal power plants. Zhao et al employed a hybrid finite-element methodmethod of characteristics numerical algorithm to study the interaction between the electric and the flow fields They found that the EHD flow plays an important role in the channel at very low Reynolds number and high EHD characteristic number [18]. Zheng et al studied the electrical characteristics of a wire-plate electrostatic precipitator and the particle transport behavior with consideration of EHD and particle space charge by numerical simulation and the results indicate that the ionic wind in the electrostatic field weakened in the condition that the movement of ions is restricted for corona suppression [20]. The research on EHD at home and abroad mainly focuses on the coupling analysis of particle transport and flow field This means that the influence of EHD on collection efficiency of ESP is obtained indirectly by the analysis on flow field distribution. Relevant research results can provide reliable theoretical reference for the design and modification of large ESP in industry
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