Optimization For Experiment On Electric Field Of Electrostatic Precipitator With Finite Element Method

In our country, about 90% electrostatic precipitators are employed tor collecting tly ash in coal-fired power plants. The new allowed particulates emission for new coal-fired power plants is 50 mg/m~3 (standard), so it is required to improve the performance of electrostatic precipitator and reduce the emission concentration of fly ash. Corona generation, particle charging and particle collection are determined by electric field.In this paper, four kinds of discharge electrodes which are usually used in electrostatic precipitator of coal-fired power plants are choused. By measured the V-I characteristic and the current density on the collecting plate on the condition of 300mm / 350mm/400mm/450mm collecting electrode spacing, Analyzed the different parameters of combinations which influence the V-I characteristic and the current density on thecollecting plate. Used the average current density j and distribution relatively deviationσ to discuss the effect of different discharge electrodes and setting manner;Give several kinds of better electrical field of different combination and the range of parameter adjustment.The numerical method can help deeply study the law of electric field characteristic which changed with parameters of combinations. In this paper, testify reliability of FEM in wire-cylinder electrostatic precipitator by comparing the parsing value and numerical value.Compute space distribution of voltage and field intensity of wire-plate by finite element method, conclude two factor which determine the current density,one is the field intensity inside region of corona glow,another is the field intensity outside region of corona glow. Discuss the cause of the better electrical field.