Electrostatic Water Filmed Cyclone Precipitator Simulation And Experiment Research

With the increasingly strict standards of environmental protection and occupational health,it is of great significance to study the technology of electrostatic water film cyclone precipitator for the removal of micro-dust.In this paper,based on the study of multi dedusting mechanism,the model of self-made low resistance-water film-electrostatic precipitator is used to simulate and test its dedusting characteristics and configuration optimization.Firstly,according to the computational fluid dynamics,the internal mathematical model of the precipitator is established.The RNG K-? turbulence model and DPM discrete phase model provided by FLUENT software are used to simulate the gas flow phase and particle phase of the two kinds of cyclones.The results show that the near-wall flow of the direct-flow cyclone separator is obviously diffuse,the turbulent flow field is generated in the preset external swirl,and the simulated dust reduction efficiency is low by setting the wall adsorption conditions;the wind speed and pressure of the return-flow cyclone separator are relatively stable,the upper and lower flow boundaries of the internal and external swirl are clear,the mixed return flow is less,and the maximum dust reduction efficiency of the simulated cyclone water film conditions is up to 82.35%.The experiments of water film and electrode configuration are carried out on the self-made conical cylinder dust collector model.The flow distribution of different types of water film was measured by collecting funnel method.The results show that the flow uniformity of the fiber net water film is better.The voltammetric characteristics of three improved corona electrodes and the performance of electric dust reduction under the condition of cyclone water film were studied.The results show that the column type R-S corona electrode has the best discharge performance,but it is relatively easy to break down;the cage type needled wire has relatively stable performance,wide corona voltage range and large discharge current.By using the method of increasing variables,the single factor experimental study on the pressure loss and dust reduction efficiency of the system is carried out in order of inlet wind speed,water film form and corona pole form.The results show that the single cyclone mechanism has a good effect on the removal of ordinary talcum powder,but it has a poor effect on the removal of fine talcum powder with a particlesize of less than 1.2 ?m;after the water film is arranged,the removal rate of fine dust is increased by 38%,while the pressure loss is decreased by 20%;the corona electrode has no significant effect on the pressure loss of the system and can significantly reduce the dust efficiency,and the removal rate of fine dust is 80.09%with the cage needle electrode.According to the results of single factor experiment,the method of variance analysis was used to carry out the orthogonal dust reduction experiment and significance analysis.The results show that the effect of inlet wind speed and electrode form on the efficiency of dust reduction is more significant,while the effect of water film form is less,but the interaction between them is obvious.The best parameters of the experimental model are as follows: 1.28m/s wind speed at the entrance of the reentrant conical cyclone,uniform water film arranged with fiber net,55 kV secondary voltage of negative high-pressure cage needle discharge electrode,at this time,the dust reduction rate of fine dust is 93.14%,and that of common talcum powder is 99.50%.