Study on Emission Reduction and Energy Efficiency Characteristics of Wet Electrostatic Precipitator for Coal Fired Power Plants

doi:10.11930/j.issn.1004-9649.202105135

Abstract

Abstract: The emission reduction characteristics and energy consumption of multiple pollutants were tested and analyzed on 122 sets of supporting Wet Electrostatic Precipitator (35 sets of metal plate type and 87 sets of conductive FRP type) of coal-fired power plants, under stable working conditions and load. The results show that the WESP has high removal efficiency for all kinds of pollutants, the particulate matter, PM_2.5, droplets and SO₃ at the exit of most WESP can be controlled below 5, 2.5, 25 and 10 mg/m³ respectively, and the ratio of PM_2.5/PM at the exit was increased significantly. Generally, the power supply parameters of conductive FRP type WESP could be raised to a higher level because of discontinuous spraying, so the SO₃ removal rate was higher than that of the metal plate WESP. Droplet concentration at the exit was lower. The specific power consumption of metal plate type and conductive FRP WESP were 0.68×10^-4~3.34×10^-4 and 0.74×10^-4~3.38×10^-4 kW·h/m³, respectively, and the average values were 1.55×10^-4 and 1.75×10^-4 kW·h/m³, respectively. The energy consumption for particle removal were 4.7~24.7 and 2.9~37.5 kW·h/kg, respectively, and the average values were 10.8 and 13.3 kW·h/kg, respectively. The higher the concentration of inlet particles, the lower the energy consumption for particle removal.This study can provide reference for the following energy saving and carbon reduction operation of ultra-low emission units.

Key words: coal fired power plants, ultra-low emission, wet electrostatic precipitator, pollutant emission, energy efficiency

LIU Hanxiao, WU Liming, ZHAO Lin, YU Liyuan, LI Jianguo, CUI Ying. Study on Emission Reduction and Energy Efficiency Characteristics of Wet Electrostatic Precipitator for Coal Fired Power Plants[J]. Electric Power, 2022, 55(5): 196-203.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202105135

https://www.electricpower.com.cn/EN/Y2022/V55/I5/196

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