Electric Power ›› 2018, Vol. 51 ›› Issue (10): 123-129.DOI: 10.11930/j.issn.1004-9649.201805182

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Study on Performance Testing Method and Emission Characteristics of Wet Electrostatic Precipitators

LI Haoran1, LIU Hanxiao2, ZHAO Lin2, YAN Shijuan2, FENG Guohua2, FANG Xiaowei2   

  1. 1. State Grid Jibei Electric Power Company Limited Skills Training Center, Baoding 071000, China;
    2. Zhejiang Feida Environmental Science & Technology Co., Ltd., Zhuji 311800, China
  • Received:2018-05-26 Revised:2018-06-19 Online:2018-10-05 Published:2018-10-12
  • Supported by:
    This work is supported by National Key Research and Development Program of China (No.2017YFC0804704,No.2016YFC0209107).

Abstract: Due to the water film covered dust collecting electrode, the existence of water mist in the discharge area and the absence of vibration and secondary dust extraction, particularly its mechanism to agglomerate the fine particles significantly, the wet electrostatic precipitator (WESP) is very effective to reduce the emission of fine particles such as SO3. Particulate matter is collected by integrated sampling head (built-in filter membrane), while PM2.5 is determined by gravimetric method (PM-10) and charge method (ELPI), and SO3 is determined by condensation method or condensation method combined with isopropanol absorption. The results show that the concentration of particulate matter in different types of WESP varies from 2mg/m3 to 5 mg/m3, and PM2.5 is lower than 3 mg/m3 with the dust removal efficiency around 75%~95%. Continuous spray is applied in the metal plate type wet electrostatic precipitator. Since there is no secondary dust of fine particles, the emission of particulate matter is kept below 1mg/m3. The emissions characterization of SO3 in different types of WESP is generally below 5mg/m3, with the SO3 removal efficiency about 60%~80%. The current density of conductive fiberglass WESP is generally greater than that of metal plate WESP, hence its SO3 removal efficiency is generally higher.

Key words: ultra-low emission, coal-fired power plant, WESP, particles, SO3, PM2.5

CLC Number: