Simulation Research On The Electrostatic Precipitator For Circulating Filter Material

The electrostatic precipitator is widely used in the purification process of industrial dust-laden airflow.Its characteristics are a large amount of flue gas treatment,small equipment resistance,high dust removal efficiency,and a wide application range.With the increasingly stringent requirements for soot emission,it is difficult for traditional electrostatic precipitators to meet the standards.The traditional electrostatic precipitator is difficult to avoid the secondary dust problem caused by rapping and the back corona phenomenon caused by high specific resistance dust,which directly leads to the reduction of dust removal efficiency.To solve the above problems and improve the efficiency of dust removal,an electrostatic precipitator for collecting dust with a circulating filter material is proposed.The dust collection process of the circulating filter material is analyzed,and the factors that affect the dust removal efficiency are clarified.The critical speed of particle deposition is used to determine that the particles are adsorbed on the surface of the filter material,and the frequency formula of the filter material transmission is derived based on the voltage drop caused by the dust layer.Established the electric field model and the physical model and mathematical model of the particle movement in the electric field and flow field,and wrote a user-defined program to characterize the electric field force and particle charging.Based on the SIMPLE algorithm,using the standard k～ε model,the Fluent software is used to simulate the dust removal process.The structure parameters of the electrostatic precipitator that collects dust from the circulating filter material,the loading voltage,the particle size,and the air velocity are four factors,and the different influence of working conditions on the efficiency of dust removal.The results show that under the conditions simulated in this paper,increasing the distance between the corona wire and the filter material and increasing the distance between the corona wire will cause the reduction of dust removal efficiency,but the impact on the dust removal efficiency is different.Increasing the distance between the corona wire and the filter material from 90 mm to 140 mm will reduce the dust removal efficiency by 15% to 20%;while the distance between adjacent corona wires from 100 mm to 150 mm reduces the dust removal efficiency by less than 5%.The voltage increases,the dust removal efficiency increases,but as the voltage increases,the increase in the dust removal efficiency decreases.When the voltage increases from 10 kV to 15 kV,the dust removal efficiency increases by13.75%,while the voltage increases from 25 kV to 30 kV.The dust removal efficiency only increases by 3.89%;particle size(1μm to 7μm)increases,the dust removal efficiency increases;the airflow rate increases,the dust removal efficiency decreases,and when the flow rate is low,the increase in the voltage has a small increase in the dust removal efficiency.When the flow rate is high,the increase in the voltage has a small effect on the dust removal efficiency.The improvement is obvious.For 1μm particles,when the voltage is increased from 20 kV to 25 kV at 0.6m/s,the dust removal efficiency increases by 3.23%,and at 1.6m/s,the dust removal efficiency can increase by 9.03%.The results of the numerical simulation can provide a certain reference value for the application of an electrostatic precipitator for dust collection by circulating filter material.