电晕放电自由基簇射过程中臭氧和NO_x的生成  

Formation of ozone and NO_x during corona discharge radical shower

作　　者：吴祖良[1] 高翔[1] 骆仲泱 倪明江[1] 岑可法[1] 

机构地区：[1]浙江大学热能工程研究所

出　　处：《化工学报》2006年第5期1214-1219,共6页CIESC Journal

基　　金：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).~~

摘　　要：电晕放电自由基簇射过程中产生的臭氧和NOx对NO氧化以及能耗有着重要的影响.从喷嘴电极入手,深入研究了喷嘴电极结构、数量以及放置方向对放电过程中臭氧以及NOx生成的影响.结果发现:喷嘴半径和个数的增加能够扩大电晕区域,同时提高放电强度.随着喷嘴半径以及喷嘴个数的增加,臭氧的产生显著提高.但是由于电晕之间的屏蔽作用,过大的喷嘴半径以及过多的喷嘴个数,都会减少放电电流,从而减少臭氧的产生.本实验中最好采用3(14)喷嘴电极.喷嘴电极个数的增加只是提高了臭氧的最大产生值,但并没有提高臭氧生成的能量利用率.喷嘴电极竖放时能产生更多的臭氧.不同喷嘴电极结构下产生的NOx都较少,浓度在15μl·L-1以下.The formation of ozone and NOx during corona discharge radical shower has important effect on NO oxidation and energy consumption. How the geometric structure, number and placement direction of nozzle electrode affected the formation of ozone and NOx during corona discharge was studied. The results showed that increasing nozzle radius and number of nozzles could expand corona region and strengthen discharge intensity. Ozone concentration increased obviously with increasing nozzle radius and number of nozzles. However, overly-larger nozzle radius and too many nozzles might lead to corona shield phenomena, which decreased discharge current and ozone concentration. In this experiment 43（14） nozzle electrode was considered the best. Increasing number of nozzles only increased maximum ozone concentration. However, the energy efficiency of NO conversion in the reactor would not be improved by increa more sing with numbel of nozzles because NO conversion depended on ozone formation. Ozone was produced vertical nozzle electrode than with horizontal nozzle electrode. NOx concentration was lower during corona discharge with different geometry nozzle electrodes, less than 15 μl ·L^-1.

关 键 词：电晕 自由基 臭氧 NOx 

分 类 号：TQ534.9[化学工程—煤化学工程]