| With the development of industry,the massive discharge of dust particles has brought serious environmental problems,threatening human health and ecological environment.At present,electrostatic precipitators are widely used in dust removal of industrial production,but their effect on the removal of inhalable particles,especially fine particles,is not ideal,while wet electrostatic precipitators can effectively remove fine particles.This paper studies the dust removal process of wet electrostatic precipitator.In this paper,through the COMSOL Multiphysics software,considering the corona electric field model,particle charging model,particle motion model,flow field model,temperature model and humidity model,a multi-physics coupling numerical simulation model is established.The dust removal process of the dust collector under dry and wet working conditions was simulated.Firstly,a simplified two-dimensional plane model is established,and the trajectories of the particles under different parameters are given.The qualitative conclusion is drawn: when the other conditions are constant,the dust collector has better dust removal effect under the conditions of high voltage,low flow rate and large particle size.Then,the dry working process of the dust collector is simulated in the three-dimensional model.By simulating the natural settling of particles without an electric field,the possibility of errors caused by non-experimental factors is ruled out.The distribution of electric and flow fields is given;the effect of plate voltage,airflow velocity and particle size on the dust removal effect was investigated by using the segmental concentration reduction rate,the deposition efficiency along the path and the total dust removal efficiency as indicators;the sensitivity of the total dust removal efficiency to the respective variables under different conditions was analyzed.The conclusion is drawn: the distribution of potential and electric field strength is the axis of symmetry of the discharge electrode and the thorn line,showing an axisymmetric form,the potential is highest in the corona line and its vicinity,and the electric field strength reaches the maximum at the tip of the thorn;the segmental concentration reduction rate of the particles,the deposition efficiency along the path,and the total dust removal efficiency increase with the increase of the particle size,increase with the increase of the voltage,and decrease with the increase of the flow rate;as the voltage increases,the dust removal efficiency is less sensitive to voltage.Compared with the low wind speed,the dust removal efficiency is more sensitive to voltage changes at high wind speeds;with the increase of wind speed,the dust removal efficiency is less sensitive to wind speed.Compared with high voltage,the dust removal efficiency is more sensitive to the change of wind speed at low voltage.Last,the wet working process of the dust collector is simulated in the three-dimensional model.The effects of plate voltage,airflow velocity and particle size on the dust removal effect were also investigated by the segmentation concentration reduction rate,deposition efficiency along the path and total dust removal efficiency;the sensitivity of the total dust removal efficiency to the respective variables under different conditions was analyzed.In contrast to the dry state,the following conclusions are drawn: under the wet working state,the segmentation concentration reduction rate of the particles,the deposition efficiency along the path,and the total dust removal efficiency are the same as those in the dry mode,but the value is larger and the dust removal effect is better.The sensitivity of dust removal efficiency to wind speed and voltage changes is the same as in dry mode,but more sensitive than dry mode. |
