The Research On The High Voltage Electrostatic Precipitator

With high dust removing rate and lower operation and maintenance cost, theelectrostatic precipitator (ESP) has a significant effect on dust removing from air, which isone of the widely used environment protection equipment. As the key part of ESP, whichhas direct influence on the dust removing rate, it is of great significance to research anddesign the control system of electrostatic precipitator，which can highly improve thecollection efficiency of ESP.The existing dust removal device commonly used now is thyristor-controlled ACvoltage regulator, with slow system dynamic response, high output voltage ripple, and poorinhibition of the flashover. The peak voltage of the ESP can only work near the flashovervoltage; voltage fluctuations will inevitably reduce the value of the average voltagebetween the dust plate, limiting the dust removal rate. High-frequency power supply cansolve the above problems, the high-frequency electrostatic precipitators in recent years hasalso become a research hotspot at home and abroad. However, if directly use highfrequency switching power supply technology, completely abandoning the existing powerfrequency dust power overall means very large investment. In order to solve the problemsof thyristor power frequency power supply, but also consider the investment cost oftransformation, this dissertation is focused on using high-frequency power supply withIGBT and at the same time retaining the original step-up transformer. Thus dust removalrate can be increased with reducing the cost of renovation.Firstly, main performance indicators of the electrostatic precipitator and the variousoperating parameters are analyzed. Considering characteristics and indicators of variouspower control system, the most appropriate power supply model and control method areultimately established. High-power electronic converter, concluding the control circuit anddetection circuit are designed. Thus the experimental platform of dust removal iscompleted.On this basis, the mathematical model of the converter is established, using thedouble-loop control mode, and considering the spark control scheme be best spark rate. Tosolve the problems caused by transformer DC bias magnetic phenomena, bias pressed is adding in the control system. Finally, simulation is constructed in the MATLAB simulationenvironment.Finally, based on the pre-theoretical analysis, the prototype is constructed, and thereliability of the system, long-term stability, the ability of anti-bias magnetic are analyzed.