自由基源物质变化对直流电晕自由基簇射脱除NO的影响  

Effect of radical source on nitrogen oxide removal by DC corona radical shower

作　　者：吴祖良[1] 高翔[1] 魏恩宗[1] 张继洲[1] 李明波[2] 吴祖成[2] 骆仲泱 倪明江[1] 岑可法[1] 

机构地区：[1]浙江大学能源洁净利用与环境工程教育部重点实验室,浙江杭州310027 [2]浙江大学环境科学与工程系,浙江杭州310027

出　　处：《化工学报》2005年第5期915-919,共5页CIESC Journal

基　　金：国家自然科学基金项目 (50176045);国家高技术研究发展计划项目 (2002AA529180);国家教育部博士点基金项目(20020335061);浙江省科技计划项目(2003201509)~~

摘　　要：氨气、氧气、氮气和水蒸气是常见的产生含N、H、O自由基的自由基源物质. 选择氨氩混合气、氧气、干空气和湿空气作为自由基源物质进行了NO的脱除研究. 发现不同的自由基源物质都能形成稳定的电晕, 但对放电特性有一定的影响; 电极中通入氧气和空气时NO转化成NO2 的效率明显高于氨氩混合气. 考虑到NO2容易被碱液吸收, 而通入氨氩混合气时生成的N2H和N2O是潜在的温室气体, 所以空气和氧气更适合作为自由基源物质; 电极中通入空气时NO的脱除效果略差于氧气, 但是与氨氩混合气相差不多. 但是从安全性和经济性的角度考虑, 空气具有更好的应用前景; 少量水蒸气的存在有助于NO的脱除. 所以在氨氩混合气、氧气、干空气和湿空气中, 湿空气无疑是最佳的选择.NH3, O2, N2 and vapor are commonly used gases to generate N, H, O radicals. NH3 + Ar, O2, dry air and humid air were selected as working gases of radical sources to research NO removal. It was shown that stable corona could be formed by different radical sources. However, they had certain effect on discharge characteristic. The conversion rate of NO into NO2 by air and oxygen was obviously higher than that by NH3 + Ar. NO2 was easy to be absorbed by lye and greenhouse gases, N2H and N2O, were produced when adding NH3 + Ar. Therefore air and oxygen were better radical sources. When air was injected into the electrode, NO removal efficiency was a little worse than the case of oxygen but almost the same as the case of NH3 + Ar. However, considering safety and economy, air has a better prospect of application. A few water vapor was helpful to improve NO removal. Humid air was the best choice among NH3 + Ar, O2, dry air and humid air.

关 键 词：自由基源物质 电晕 NO脱除 影响 

分 类 号：TQ534.9[化学工程—煤化学工程]