| Energy conservation and emissions reduction and environmental protection is an important social theme of economic development and industrialization process. In view of the situation of environmental protection in recent years and the proportion of coal-fired unit installed capacity, Reduce soot emissions from coal-fired power plants for environmental protection work is imperative. Ministry of Environmental Protection and the State Administration of Quality Supervision, Inspection and Quarantine in 2012 formulated and promulgated the GB 13223-2011 " Emission standard of air pollutants for thermal power plants " and formally implemented,The new standards require that boiler soot emission concentration at 30 mg / m3 or less, Existing operation of the power plant began full implementation in July 2014, In order to meet the standard requirements, To further reduce the pollution of the environment, Coal-fired units must improve the efficiency of the electrostatic precipitator, reduce dust emissions. But only with rotating electrode, such as low temperature economizer modification technology can not meet the requirements of national standard. IGBT PWM control technology was applied to electrostatic precipitator power supply, spark control can be more flexible, more stable output waveform, for high, medium resistivity has obvious effect of dust removal, thus meet the standard requirements, at the same time the power supply energy consumption also fell, realize the double value to save electricity, reduce soot emissions.This paper mainly expounds the basic principle of electrostatic precipitator, classification, key technology and its characteristics, introduces the principle of high frequency power supply, compared to traditional power supply analysis of the advantages of high frequency power supply, from the system, cooling system, control system, operation mode, the overall application design scheme and so on several aspects,to design a high-frequency power supply(72kV 1200mA)is applied to the electrostatic precipitator on 330 MW coal-fired units. Then transformation phased in Huaneng Yingkou Thermal Power Unit # 2 field electrostatic precipitator 1, 2 and 3, 4 electric field into operation, At the same time at different stages of commissioning and performance testing of different operation modes of the electrostatic precipitator to verify the energy saving benefits and value they have. |
