Research And Design Of High Voltage Pulsed Electrostatic Water Treatment System

The circulating cooling water system is the most important component system of thennal power plants.The reliability of this system is of great significance for the safety and economic operation of power plants.How to better implement the scale inhibition,corrosion inhibition,and killing of microorganisms and increase the concentration ratio of circulating water has become the most important issue in system operation.As a new water treatment technology,high voltage electrostatic water treatment technology has become a research hotspot.Based on the research of power factor correction technology and analyzed the typical topology of high voltage pulse circuit,aiming at the problems existing in the current high voltage pulse circuit,its topology is improved.The improved bridgeless dual diode Boost PFC circuit is introduced in the high voltage pulse power supply.the working principle,working state and digital one cycle control strategy of the improved bridgeless Boost PFC circuit are studied.At the same time,the working state of the LCC resonant converter circuit is analyzed in detail,the bidirectional voltage doubler rectifier circuit is used to increase the output voltage level,a high voltage pulse electrostatic water treatment system is designed and developed.The system adopts STM32 microcontroller as the main controller.According to the working principle and design requirements of the high voltage pulse circuit,the parameters of the bridgeless PFC circuit and the LCC resonant converter circuit are calculated and configured.According to the requirements of the IGBT switch,the IGBT driver circuit and isolated auxiliary power supply are designed;according to the monitoring requirements of the circulating water system,the temperature sampling circuit,the conductivity sampling circuit and the vacuum sampling circuit are designed.The improved Boost PFC circuit is simulated and analyzed in the Saber simulation software,and it is compared with the traditional Boost PFC circuit with average current control.A post-stage DC/DC circuit simulation model was built to analyze the output characteristics of unidirectional and bidirectional voltage doubler rectifier circuits.The parameters such as temperature,vacuum degree,conductivity and pulse power frequency collected by the system are sent to the host computer through LoRa long-distance communication,The upper computer software is designed using LabVIEW,The functions of displaying current data curve,report query,parameter setting and other functions are realized through upper computer software.Based on the above design and analysis,an experimental prototype of a high voltage pulsed electrostatic water treatment system was constructed.In a practical operation test of a power plant,the test results show that the system has the same effect as the traditional chemical method in anti-scaling,corrosion inhibition,sterilization and algae elimination,this method is superior to traditional methods in terms of water saving and scale inhibition efficiency.The method of high voltage pulsed electrostatic water treatment has a certain influence on the development of circulating water treatment.