Research On The Influence Of Electrode Structure On The Collection Of Fine Dust In High-voltage Electrostatic Precipitator

With the rapid development of China's economy,environmental pollution problems have become increasingly serious,and China's air pollution situation is complex and severe,and it needs to be effectively alleviated.In which,PM2.5 and other fine particles have become major air pollutants.Because of its serious harm to human health,A series of measures have been made by the environmental protection department to improve the environmental pollution.Electrostatic precipitator is the main equipment for dust-containing flue gas purification in industrial production.At present,the difficulty in designing and reforming of electrostatic precipitator is how to improve the collection efficiency of fine dust.The main reason is that the fine dust is greatly disturbed by ion wind.In this paper,in order to reduce the disturbance of fine dust by ionic wind,based on the line-orifice dust collector,two new types of structured dust collectors with discontinuous discharge electrode-orifice and thorn electrode-orifice were designed.The discharge mechanism and dust removal effect of two new structure dust collectors are investigated and are compared with that of transitional structure of dust collectors.The fine dust produced by the sintering machine head serves as the experimental dust.First,the effect of different aperture ratios on the collection efficiency of the orifice dust collector is determined,and the optimal aperture ratio of the orifice dust collector is determined.The discharge characteristics,the total dust removal efficiency,and the classification efficiency of PM0.5,PM2.5,PM10 of the two new types of are studied;Finally,the influence of two new types of structural electrodes on the dedusting effect of orifice plate precipitator is analyzed and discussed from the level of ion wind distribution,and the optimal electrode and pole matching mode are determined.The results show that:As the voltage gradually increases from 0-50 KV,the collection efficiency and classification efficiency of the line-orifice dust collector first increase and then decrease,and the maximum value is reached at a voltage of 40 KV.The dust removalefficiency of the electrostatic precipitator cannot be continuously improved only by increasing the discharge voltage.The perforated plate dust collector effectively reduces the turbulent action of the ion wind through the perforation treatment,thereby improving the collection efficiency of fine dust,but the perforation ratio needs to be moderate,and the over-or under-perforation ratio will affect the dust removal efficiency.The optimal opening rate is 30% in the present experiment.Striping phenomenon on the dust collecting electrode occur when the"Wire-to-hole" and "wire-to-board" discontinuous discharge electrode perforator are used in the experiment.The discharge intensity and dust removal efficiency of the"wire-to-hole" structure are slightly better than " "Wire-to-plate" structure,the collection efficiency of PM0.5 and PM2.5 is higher than the wire-orifice electrode.The "wire-to-hole" structure of the intermittent discharge electrode has the highest dust removal efficiency at a voltage of 50 KV.The intermittent insulation treatment reduces the effect of ionic wind on the collection of fine dust.However at50 KV voltage,its dust removal efficiency is close to that of a 40 KV line-orifice dust collector.Which indicates that the electrode consumes more energy to achieve the same dust removal efficiency,so the "wire-to-hole" electrode needs to be further optimized.Based on the "wire-to-hole" intermittent discharge electrode,a burr electrode equipped with a needle tip was experimentally designed,and it was found that the electrode had excellent discharge characteristics,the halo voltage is only 7.5KV.At the same voltage,its discharge current was high.The discharge in this electrodes is stronger that in transitional wire electrodes.The burr electrode hole plate dust collector achieves the best dust removal efficiency at a voltage of 45 KV.Its highest total dust removal efficiency and PM0.5,PM2.5 and PM10 classification efficiency are higher than the line-hole plate and discontinuous discharge electrode hole plate dust collector.The ion wind generated by the needle tip has a cone-shaped radiation distribution along the direction of the orifice plate.The "needle tip to hole" structuregreatly diverts the ion wind generated by the needle electrode,reduces the interference of the ion wind on fine dust.At the same time,the corona current density generated by the tip electrode on the dust collector plate is larger and uniform,so the electrode can greatly improve the collection efficiency of fine dust.