新型复合静电除尘器脱硝性能研究

NO是燃烧产生的重要气体污染物之一。脉冲放电与直流放电相结合的新型除尘方式在有效提高对粒径小于2.5 mm的颗粒物(PM2.5)脱除效率的同时，还具有氧化NO的能力。高压脉冲放电产生的高能电子可以产生强氧化性的自由基，对NO进行氧化，同时还可以直接打断N-O键，游离态的N原子大部分生成了N2分子。线筒式放电结构氧化NO的能力明显优于线板式放电，与除尘能力具有一致性。氧化效率随着电压的升高而升高，由于一定电压下对NO的处理量趋于定值，氧化效率与NO的初始浓度具有重要的关系，同时也受NO2浓度的影响。在该文讨论的反应器中，当脉冲峰值电压达到50kV，NO初始体积分数低于10-4时，NO的氧化率可以达到90%以上。氧化产物NO2可以在湿法脱硫设备中脱除。

Research on Denitrification Character of New Type Combined Electrostatic Precipitator

NO is one of the most important pollutants during combustion. The combined electrostatic precipitator (ESP) has a character of denitrification with the increasing efficiency of catching particulate matters smaller than 2.5 mm (PM2.5). During pulse corona discharge, the formation of ozone and free radical has important effect on NO oxidation. Electron with high energy can also break N-O directly and the dissociative N can form N2. Accordant with dust catching efficiency, line-cylinder chamber is better than line-plate chamber. With the increase of voltage, the denitrification efficiency becomes higher. Under a certen voltage, the efficiency of denitrification is strongly influenced by the initial concentration of NO and NO2. In the reactor developed by this paper, the oxygenation efficiency can be higher than 90% when the voltage is 50kV and the initial NO volume percentage is less than 10-4. The oxidation outcome NO2 can be absorbed by wet gas desulphuration(WGD) technology.