Study On Corona Electrode Sensitivity To Dust In Electrostatic Precipitator

As an extremely important component in electrostatic precipitator, the performanceof corona electrode will directly affect the efficiency of dust removal. In practicaloperation, for inappropriate operation of electrostatic precipitator, the surface and the tipof corona electrode gradually adheres a large amount of dust, resulting in corona tipballing which critically impacts the performance of corona discharge and reduces theefficiency of dust removal. In this paper, targeting on corona electrode, the method ofsolving the problem of corona tip balling is proposed, through analysis the theory ofcorona tip balling, attempting to solve the problem of corona tip balling from coronaelectrode materials.Firstly, according to a large number of references, two main reasons of corona tipballing are presented: one is spark discharge, and the other is the integrated affect ofmetal surface energy absorption and electric field.Secondly, the PDE toolbox of MATLAB software is used for the numericalsimulation of bur type corona pole electric field, we have drawn the conclusion that thecorona electrode electric field is greatly affected by the space charge density and the areaand the location of corona will change as space charge density changing.Thirdly, the X fluorescence analysis was carried out on the samples fromelectrostatic precipitator applied to the head of sintering machine head, these samplesinclude the origin dust, the dust on corona electrode and the corona electrode, so that themain components and the differences of elements content of sintering dust were obtained.Though the energy spectrum analysis on corona electrode using field emission scanningelectron microscope (EDS), the main metal elements were obtained, which providesreferences for material selection in the experiment.Finally, four kinds of materials were selected for experiment of dust adsorption withcorona electrode using a self-designed experimental device. The results show thatdifferent kinds of dust have different affinities on the corona electrode, and the coronaelectrodes of different material also have different adsorption capability. Therefore, the method to solve the problem of corona tip balling through changing the corona electrodematerial is currently feasible.