Particle Movement Characteristic In Discharge Process Of Electrostatic Precipitator

With the increasingly high demand for energy conservation and environmental protection standards,electrostatic precipitator plays an important role in either basic natural phenomena or various industrial processes.In the application of electric precipitation,there are still many problems,such as anti-corona,secondary dust,and small particles removement,etc.,hence,investigating the movement of the particle in electrostatic precipitator is the key to solving these problems.The quiet complex electric fluid motion is formed in practical electrostatic precipitator under corona discharge power,especially between corona pole and anode plate produced by the corona wind which directory affects the movement law of the flue gas particles,thus affects the efficiency of dust collection.As a result,it is important to study the generation of the corona wind and the flow characteristics of charged particles under corona wind power for the performance of electrostatic precipitator.This paper takes the movement characters of the flue gas particles during discharge as the research subject,we firstly built the multiple ion mathematical model of corona discharge and the numerical models of corona wind,and then apply it to solve problems of the transport of charged particles in an hybrid field:the movement characters of the charged particles of different size by changing the discharge parameters.In this paper,the distribution product of flue gas was firstly analyzed,the multiple ion mathematical model was built based the product separation.Combined with the adsorption and migration characteristics of various ions,the relationship between the ion migration and the adsorption rate in the process of ionization and the strength of the electric field was analyzed to establish a calculation model for space charge in electrostatic precipitator.In terms of the space charge and body forces,the numerical equation of electric fluid mechanics was proposed based on the multiple ion mathematical model.Compared to previous work,The stress model of charged particles under the action of physical field such as electric field,gravity and fluid was described,and combined with the numerical models of corona wind to obtained the theoretical basis finally to accurately and effectively predict the charged particles under the coordination of complex physical field.The voltammetric behavior of the needle plate under different parameters is tested for obtaining the effect of discharge voltage,discharge spacing and tip radius on the voltammetric characteristics.The discharge electrode of the experiment is simulated based on the theory elucidated above.The calculation results are compared well with the experiment,accordingly the mathematical model constructed in this paper is rational.The numerical method is used to calculate the field strength and electron concentration distribution in the instantaneous discharge gap of corona and finally the rules of needle plate discharge are summarized.The distribution of corona wind flow in the process of needle plate discharge is calculated using the corona wind model aforesaid.The quantitative and qualitative analysis is carried out and the results are identical with the experiment in the literature,so the numerical model has a high accuracy.The effects of different discharge parameters on the corona wind flow field is studied,and the law of the corona wind is declared in detail.The corona wind motion of the line plate in the actual size electrostatic precipitator is explored,then compared with the condition of discharge process of the board of the experiment in literature,the inner relationship between the inlet speed of the electrostatic precipitator and the development of the corona wind is fabricated.The influence of various anode plate and corona pole structures on the corona wind is simulated too.This paper provides an effective way to solve the disturbance of the airflow caused by the corona wind.Finally,the typical scientific problem related to the actual engineering problem is carried out by using the charged flue gas particles in the electrostatic precipitator,which is coupled with the above corona model to examine the characteristics of the particles in the multi-field.The influences of the factors,such as the charge capacity,the particle size distribution and the plate spacing,on the deposition of the particles on the anode plate are revealed.Furthermore,the impact of the corona wind on the particle deposition process is discussed.This work provide a reliable evidence to solve the re-entrain dust caused by corona wind.