布袋除尘器改造电除尘器关键技术在600 MW燃煤机组超低排放改造工程中的应用分析

Application of key technology changing bag filter to electrostatic precipitator in ultra-low emission upgrading projects of coal-fired power plants

山西鲁能河曲发电公司完成了2×600 MW燃煤机组布袋除尘器改造为低低温电除尘器,实现了超低排放,通过协同优化三相电源低低温电除尘器和湿法脱硫同步实现SO_2和颗粒物的超低排放,针对本燃煤机组工况特点以及原布袋除尘器本体大小,通过对电除尘器本体选型、流场优化、三相电源等关键技术的工程应用,完成布袋除尘器改造电除尘器。结果表明:在电除尘器比集尘面积为83.5 m^2/(m^3·s)、入口烟尘质量浓度为35.8 g/m^3的条件下,电除尘器出口烟尘排放总质量浓度在9.93~14.69 mg/m^3,其中PM_(2.5)排放质量浓度不高于1.58 mg/m^3。三相电源低低温电除尘集成湿法脱硫可满足燃煤电厂超低排放要求。

This paper presents a pioneer project of changing the bag-filter into colder-side electrostatic precipitator （ESP） for two 600 MW coal-fired boilers of Shanxi Luneng Hequ Power Plant for ultra-low emission of particle maners （PM） and sulfur dioxide （SO2） by cooperative optimization of colder-side ESP with three-phase power source and wet flue gas desulfurization （WFGD）. Due to the coal-fired boiler condition and initial bag filter size, we change bag filter into ESP by taking ESP sizing, gas flow distribution optimizing, three-phase power source, etc. into consideration. The main result of this paper is when the ESP＇s specific collection area is 83.5 m^2/（m^3·s） with three-phase rectifier transformer and the inlet ash load concentration is around 35.8 g/m^3, the outlet particle mass concentration is 9.93-14.69 mg/m^3, of which the mass concentration of particles with diameters of less than 2.5 μm is below 1.58 mg/m^3. The integration of colder-side ESP with three-phase power source and WFGD can achieve ultra-low emissions of air pollutants for coal-fired power plants.