Analysis of some solutions that improve performances of plate-type electrostatic precipitators

The plate-type electrostatic precipitators are use in burning industry applications and can treat large gas flows. The paper presents the maximum ionization distance, analytic and graphic, near discharge wires depending on the voltage supply frequency and the discharge wires radius. A problem of this type of precipitator is difficulty to collection high resistivity fly ash. In the inlet section the fly ash resistivity is moderate and is necessary to charge dust particles as many is possible. It is useful to use traditional dc energization. For the middle section and especially for outlet section, where the fly ash resistivity is high, it is necessary another supply solution for section because the charging particle decrease when is use traditional dc energization. The paper presents analysis of different types supplies of ESP sections. The intermitent energization of sections can be a cheap solution to middle and outlet section (without change the power supply structure, it is necessary the change of the automatic voltage control unit). It is important to know the current-voltage characteristics to obtain the optimal control of the amplitude, the voltage shape, the input power and the collection efficiency. With comparative analyze of the measured and computed characteristics, with different mathematical model of current-voltage characteristics, it can be found which models estimate the current-voltage characteristics for plate-type electrostatic precipitators.