摘要
燃煤烟气细颗粒物排放的高效控制是控制雾霾天气的重要手段之一,为此国家颁布了世界上最严格的标准之一:《火电厂大气污染物排放标准》(GB13223-2011),要求火电厂粉尘排放浓度低于30 mg/m3,重点地区低于20 mg/m3。干式静电除尘器由于反电晕和二次扬尘等问题,对亚微米级颗粒物脱除效率较低,难以完全满足新标准的要求。湿式静电除尘技术(WESP)通过水膜清灰方式代替振打清灰,可有效控制湿法脱硫塔后细颗粒物的排放,实现燃煤烟气细颗粒物的深度脱除。该文详细阐述了湿式静电除尘器在粉尘脱除效率、材料润湿、抗腐蚀特性及多种污染物协同脱除等方面的最新研究进展,重点介绍了湿式静电除尘技术在燃煤电厂中的应用现状,并在此基础上对我国湿式静电除尘技术的发展做了总结和展望。
Reduction of fine particle from flue gas is an important way to solve the severe haze problem. Therefore, the strictest emission standard of air pollutants for thermal power plant （GB 13223-2011） has been issued to require the dust from power plant kept below 30 mg/m3 for all and below 20 mg/ma for the special regions. Limited by back corona and reentrainment, dry electrostatic precipitator obtains low efficiency on sub-micro particles, thus is hard to meet the demand of new standards. Wet electrostatic precipitator （WESP） has good performance for PM2.5 control since the collecting electrodes are cleaned by water flushing rather than rapping. In this review,the new achievements of removal efficiency, wettability of materials, corrosion resistance and multi-pollutants removal for WESP were discussed, conclusion and forecast for WESP in China was made after the introduction of its application status in coal-fired power plants.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2014年第6期83-88,102,共7页
Environmental Science & Technology
关键词
燃煤烟气
湿式静电除尘器
PM25
协同控制
flue gas
wet electrostatic precipitator （WESP）
PM25
multi-pollutants control
