Study On The Relationship Between The Structure Relations And Efficiency Prediction Models Of Electrostatic Precipitator Removal Of Fine Particles

In recent years,there has been frequent occurrence of haze in China with fine particulate matter(PM2.5)as the primary pollutant,which has led to the intense attention of the whole society.Electrostatic precipitator technology has always been an efficient control method for industrial source particles in China.The electrostatic precipitator which is widespread applied plays an important role in the control of PM2.5.However,with the increasingly stringent emission standards of smoke and dust in various industries,especially in the context of the full implementation of ultra-low emission reforms in China's coal-fired power plants,the upgrading and transformation of traditional electrostatic precipitators is faced with higher requirements and challenges.This study aims at the problems faced by the technical upgrading of electrostatic precipitators.Through the design and construction of a small electrostatic precipitator experimental platform,the key control parameters of electrostatic precipitators(such as polar configuration,plate spacing,electric field velocity,and number of electrodes)were explored and studied.The effect of dust concentration,pre-charge,and dust type on the removal of fine particles,and relying on the classical Deutsch's dust removal efficiency formula to construct a more accurate full particle size(?10?m)particle removal efficiency model for electrostatic precipitators.The technological transformation of the device provides the basis for optimization of design and operating parameters to meet more stringent emission requirements.The results of this study show that:Breakdown voltage at the same pole pitch:wire electrode<circular sawtooth electrode<flat sawtooth electrode;the wider the pitch of the plates,the higher the starting voltage and the higher the breakdown voltage.Comparing the three types of electrodes,the dust removal efficiency in the full particle size section:circular sawtooth>flat sawtooth>wire electrode.The larger the distance between the plates,the lower the dust removal efficiency,and the distance between the plates is 300 mm.The higher the wind speed of the electric field is,the lower the dust removal efficiency is.When the wind speed of the electric field is 1.0 m/s,the highest removal rate of the dust concentration can be reduced by 24%when the wind speed of the electric field is 0.5 m/s.The number of electrodes increases,the current density increases,and dust collection efficiency increases accordingly.From the overall trend,the higher the dust concentration,the higher the removal efficiency.In the range of dust particle size>1.0 ?m,the dust removal efficiency is compared with high-strength gypsum>calcium carbonate>titanium dioxide>microsilica>boiler fly ash>talc.Pre-charging can improve the collection efficiency of the dust collector for fine particles,and the increase in pre-charged sub-micron particle size dust concentration levels is only 16%when not pre-charged.An improved dust removal efficiency simulation formula is proposed.After comparison with other models adopted by other scholars,the model used in this study can control the simulated error of dust removal efficiency between 5.5%and 7%.When using circular serrations and flat serrations in sequence,A,B,and C all increase accordingly.Taking the value of A,B,and C as the reference when using a 100-mm pole pitch,the value of A decreases accordingly as the spacing between the plates increases,and the B and C values increase accordingly.When the wind speed of the electric field increases,the values of A and B decrease accordingly,while the value of C increases accordingly.When the number of electrodes increases,the A and B values decrease accordingly,and the C value increases accordingly.When the dust concentration increases,the A value increases accordingly,while the B and C values decrease accordingly.