Numerical Simulation And Experimental Research Of The ESP With The New Tape Transverse-plate Of Double-Vortexes-Plates

Air pollution is becoming increasingly serious with the development of socialeconomy, which has seriously affected people’s health and normal life. Fine dust has a great bad influence on human health. Electrostatic precipitators is the most widely used dust removal equipment, however, there are still some drawbacks such as low ion concentration, low particle charge and setting rate. The problem of low efficiency of super fine dust removal has not be fundamentally solved. This paper introduces a electrostatic precipitators(ESP) with the New Double-Vortexes-Plates to solve the problem of low removal efficiency of super fine dust of ESP, and made study of simulation and experimental on its dust removal characteristics.A row of electrode added in front of each row of the plates and plates were optimized, In order to make up for the defect that electric field is weak in the parks of region resulting from the large distance between the electrodes and plates. First, it can improve concentration, increase dust particle charge and the rate of coagulation,second it is to increase the particle residence time and the chance of a collision. The flow field of ESP was simulated by FLUENT of ANSYS14.0 and the effect of the electric field was loaded in FLUENT by UDF. We first performed the numerical simulation with fully consideration of various factors such as flow field, electric field and gravity field to make the study more complete, scientific and accurate. The result showed that the performance of this new ESP was obviously superior. The simulating results can provide some reference information and parameters for the further design and research for ESP’s industrial application.This article includes three parts of theoretical analysis, simulation and experimental study. Study processes:(1) studying the corresponding theory to provide a theoretical basis for the simulation and experimental.(2) The simulation of the continuous phase flow field and coupling of discrete phase and continuous phase.(3)Designing corresponding experimental study, through the experiment research to validate the results of simulation calculation. The main results were as follows:(1)According to the simulation results of the continuous phase flow field, itcould be concluded that: the pressure loss increased with the increasing of the velocity,pressure loss was only 260 Pa when the inlet wind velocity was 3 m/s, still below the pressure loss in the resistance of dust removal equipment and could meet the design requirements of ESP. The dust collection area could form relatively good vortex airflow when H was about 14 mm and d was about 110 mm respectively, greatly increase the residence time, and also increase the probability of particles collisions,inturn increase the collection efficiency. The lower of the speed of collecting area is the more effective of dust particles’ trap and it would not produce secondary dust.When the inlet wind velocity was 3m/s, airflow velocity near the surface of the plate is about 0.8 m/s. When the shutter was placed at angle of 45, the turbulence is more intense at the top right and is little at bottom left, and secondary dust could be prevented. ESP performance is better when row spacing was 110 mm, plate height was 14 mm, inlet average wind speed was below 3m/s.(2)According to the results of coupling of discrete phase and continuous phase, it could be concluded: the move dust particles showd a more intense swirl, turbulence effect is very good, which is beneficial for better dust charged; particle trajectories appeared obvious spiral that the moving distance has increased a lot and increased the chances of particles being trapped. Particle residence time was very long. particle residence time distribution indicated that the greater the particle size the less time it cost to being trapped. It also demonstrated that the residence time of dust particles could be increased by about three times, increasing the probability of trapping dust particles. Removal efficiency can be as high as 96.5% of PM10. ESP performance is better when working voltage for 18 k V-18.5 k V.(3)According to the experiment of dust removal efficiency,it could be concluded that: the dust collection efficiency of this ESP was high, consistenting with the results of numerical simulation. ESP performance was better when row spacing was 110 mm,the applied voltage is 18 k V, plate height was 14 mm, inlet wind speed was 3 m/s.