| The electrostatic precipitator has been widely used in industrial production,and its overall mass removal efficiency of dust can reach 99%.However,the electrostatic precipitator has a low removal efficiency for particles with particle size of 0.1-10 ?m,and there is a penetration window in the removal efficiency within the particle size range of 0.1-1 ?m.At the same time,the removal efficiency of the particles will affected by the parameters of the electrostatic precipitator,secondary dust,corona wind and other factors.Therefore,this article presents a simulation method to study the removal efficiency of particles in a two-dimensional wire-plate electrostatic precipitator.The research results can provide some theoretical guidance for the optimization and design of electrostatic precipitators.This paper verifies the reliability of the model by comparing the calculated values with the existing experimental data within the tolerance range.The main research contents are as follows:First,this paper analyzes the existing electrostatic precipitator efficiency calculation models,including Deutsch,Cooperman,Zhao model,then performs model prediction on the efficiency of the electrostatic precipitator in an actual power plant.The efficiency is compared with the actual removal efficiency of the power plant.the efficiency prediction model that best meets the actual removal efficiency is obtained in the range of 0.01-10 ?m.Secondly,A multi-physics simulation software COMSOL was used to establish numerical simulation model of fine particles removal by electrostatic precipitator.The internal electric field distribution,flow field distribution,and particle motion field distribution characteristics were analyzed.Studies have shown that the existence of space charge makes the electric field and potential distribution between the plates more uniform.The smaller the inlet velocity,The corresponding ratio of dimensionless constant electrostatic body force to inertial force NEHD is greater,the flow between the plates is close to a stable laminar flow.The charging mechanism of the particles is different in different size ranges.When the particle size is 0.01?m-0.1?m,the charging mechanism of the particles is mainly diffusion charging.When the particles enter the dust collecting plate,the charging rate reaches the maximum.When the particle size is 1.0?m-10.0?m,the charging mechanism of the particles is mainly electric field charging,and the charging rate reaches the maximum when the particles reach the position near the first discharge electrode.In addition,the collection efficiency of 0.01-10?m particles was calculated,and it was found that when the particle size is less than l?m,there is a large difference in the particle collection efficiency calculated with or without considering the drag slip correction.When the particle size is larger than 1 ?m,the particle collection efficiency calculated in the two cases basically agrees.Finally,the effects of inlet velocities,applied voltages,plate lengths,plate spacings,and the presence or absence of corona wind on the particle trajectory and particle collection efficiency in the particle size range of 0.01-10 ?m were analyzed.The results show that the applied voltage and the length of the plates are positively related to the collection efficiency of particles,With the increase of the plate voltage,the particle collection efficiency increases.As the plate length increases,the particle collection efficiency increases,but the growth trend gradually slows down.With the increase of the inlet velocity and the plate spacing,the particle collection efficiency decreases.In addition,it was found that the capture efficiency of particles in the presence of a corona wind is greater than the case where the corona wind is not considered,that is,the corona wind has a promoting effect on dust efficiency.At the same time,the effect of corona wind on the efficiency of dust removal decreases with the increase of inlet flow velocity,it increases with the increase of plate voltage. |
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