Numerical Simulation Of The Electrostatic Precipitator Chamber

In recent years,Air pollution is very serious,the state attaches great importance to air pollution control.As an important environmental protection equipment,ESP plays an important role in improving air quality.Due to the high dew point and strong corrosiveness,the flue gas condense into liquid on the surface of insulation parts easily,which leads to The frequent damage of insulation parts and affects the normal production,Traditionally,electrical heating tube is installed around the insulation part,because the electric heating tube is too close to the insulation,As a result of heat conduction and thermal radiation,the temperature difference between the upper and the lower parts of the insulation is too large,as a result,thermal expansion stress makes insulation crack,and the service life of insulating component is shorten.What's more,it is necessary to replace the insulation parts frequently,which cause serious economic losses to industrial production.In order to solve the problem of frequent damage of insulating parts,In this paper,the numerical simulation of the insulator chamber with hot air blowing system is presented,and three schemes were set up,which are scheme A,scheme B and scheme C.Unlike the scheme A,the scheme B has a certain number of holes on the cover plate of the pressure insulator.Scheme C is to explore the influence of the hole on the temperature field and velocity field in the insulator.First of all,the geometric model is set up in SolidWorks,and then the model is imported into ICEM CFD.the geometric model of meshing and boundary conditions are determined in ICEM CFD,then ANSYS FLUENT is used to calculate the temperature and velocity distribution in the insulator chamber,The results are imported into Tecplot 360 for processing,and the temperature field and velocity field are obtained.By comparing the plan A and B shows that the hot air blowing system does not make the temperature inside and near the area of all the vibrating parts higher than the dew point temperature,The phenomenon of temperature below dew point is easy to appear in the vicinity of the inlet and outlet and the vicinity of the vibrating parts,in order to maintain the temperature above the dew point,preventing condensation and corrosion,the real-time temperature monitoring system and electric heating tube can be increased in this part,in addition,Although the opening of the cover plate of the pressure insulator makes the range of the hot air jet become shorter and the reflux effect becomes worse,the surface of the insulator and the shaft is more susceptible to condensation and corrosion,However,the temperature difference between the inner and outer walls of the pressure insulator is reduced,and the flow rate of the hot air in the main body of the electrostatic precipitator is reduced,which reduces the possibility of two dust,Through the comparison of the simulated temperature and the measured temperature of the plan A and B in some fixed points,the simulation results of plan A and B are consistent with the measured results for the most unfavorable temperature region.Through the analysis of the numerical simulation results of C,it can be seen that the increase of the through-hole makes the temperature field around the vibrating parts not meet the requirements,and it is easy to dew on the surface of insulation parts.The research of this subject provides a new idea to solve the problem of frequent breakdown of insulation parts,which is of great significance for industrial production and environmental protection.