Characteristic Analysis And Experimental Study Of Dust Particles Captured By Charged Water Mist

Faced with the problem of difficulty in removing fine particles,it is difficult for traditional electrostatic precipitators to improve the efficiency of removing fine particles to meet national emission standards and protect human health.Studies have shown that charged water mist can effectively improve the agglomeration efficiency of fine particles.However,the current dust removal technology has some problems such as uneven distribution of fog droplets in the charged area,gathered water in the box,equipment short-circuit,and high corona initiation voltage.In this paper,through a combination of theoretical analysis,numerical simulation and experimental exploration,a new type of partitioned charged water mist dust capture system is designed and built,in order to effectively solve the problem of the existing wet-electric composite dust collector.Mist collection efficiency provides a theoretical basis for the prevention and control of fine particles in real production.Based on the electrostatic dust removal mechanism and the spray dust reduction mechanism,the mechanism of charged water mist dust capture is analyzed and summarized,and the movement characteristics of the charged water mist in the dustcontaining airflow are studied.It is concluded that the dust particle size,specific resistance and spray effect are the main factors affecting the dust collection of charged water mist.Based on the theory of fluid dynamics,gas-liquid coupling and droplet breaking theory,using the method of FLUENT numerical simulation,the internal flow field of the charged water mist dust removal box is simulated.The influence of different inlet wind speeds on the uneven distribution of airflow in the box is analyzed,and the influence of different nozzle arrangement,atomization pressure,and atomization angle on the atomization effect in the box is studied.It is concluded that the change law of airflow in the dust collector box with different inlet wind speeds are the same;the second nozzle arrangement method,that is,when the atomization area and the charged area are divided into sections,and the double rows of 4 nozzles are installed,the droplet distribution in the box is the most uneven;When the atomization pressure is 6-8MPa,the droplet size is more conducive to collecting dust and the distributions are centralized,and the droplet concentration distribution is more even;when the nozzle atomization angle is 80°,the droplet distribution in the box is more even.Through theoretical analysis and numerical simulation analysis results,a new partition charged water mist dust removal system was improved and built,and studied the influence of factors such as charging voltage,wind speed in electric fields,and atomization pressure on the dust removal efficiency of the new partition charged water mist dust removal system.Compared with traditional electrostatic dust removal,the efficiency of charged water mist dust removal is higher under the same conditions;with the increase of the charged voltage,the dust removal efficiency of the charged water mist continues to increase.When the charged voltage is 50 k V,the dust removal efficiency is as high as 98.51%,which is 13.61% higher than electrostatic dust removal efficiency,but the growth trend is beginning to slow down.As the wind speed of the electric fields increases,the dust removal efficiency of the charged water mist gradually decreases.Considering the air volume of the dust collector,the dust removal effect is better when the wind speed of the electric field is 0.8-1m/s;The dust removal efficiency of the charged water mist first increases and then starts to decrease with the increase of the atomization pressure,and when the atomization pressure is 6MPa,the dust removal efficiency is the highest.This research provides important parameters and basis for the industrial design and application of charged water mist dust removal technology.