| The rapid development of modern industry brings serious air pollution. Electrostatic precipitator has well comprehensive performance, but its collecting efficiency for fine particles is low.Aiming at this problem, in this paper a new type of electrostatic precipitator named dipolar charging electrostatic precipitator is presented. Its electrode configuration is plate-plate, and there are needles fixed on both corona electrode and back corona electrode. The needles generate corona discharging on both corona electrode and back corona electrode simultaneously, and both plates can collect dust.Secondly, this paper analyses the collecting mechanism for fine particles of dipolar charging electrostatic precipitator, including ionic wind, electric field force and electrostatic agglomeration. The electric field distribution formula is derived, and the flow field of this electrostatic precipitator is studied by numerical simulation. The ionic wind of single needle is measured by means of PIV technique in this paper, the results have shown that the velocity of ionic wind is higher than 2m/s, and this is very beneficial for collecting fine particles. The agglomeration of particles in dipolar charging electric field is studied theoretically, and the experimental research on fine particle agglomeration photographs are achieved by means of scanning electron microscope, the results have shown that there is obvious agglomerate.In addition, the collecting performance of dipolar charging electrostatic precipitator and general electrostatic precipitator are measured through the comparison experiments, the results have shown that the collecting efficiency for fine particle of former is obviously higher than the latter. Then, the electrode configuration optimization is achieved.Finally, the dipolar charging electrostatic agglomerator which has better performance is presented based on former studies. The collecting performance is measured, and the feasibility of industry application is analyzed. |
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