自由基簇射电催化氧化同时脱硫脱硝过程反应特性及机理研究  

Reactive Characteristics and Mechanism of the SO_2 and NO_x Simultaneous Removal Process Using a Radical Shower Electro-Catalytic Oxidation System

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能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《高校化学工程学报》2006年第6期925-931,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家863计划资助项目(2002AA529180);教育部博士点基金资助项目(20020335061);国家重点基础研究发展规划项目(973)(2006CB200303)。

摘　　要：应用一种新型的电催化氧化技术??电晕放电自由基簇射技术进行了烟气同时脱硫脱硝实验,重点分析了SO2和NOx脱除的反应特性和相互影响机理。结果表明:在0.042L?min?1的氨气注入下,50%的SO2在放电前被脱除,但放电过程仍对SO2的脱除有一定的促进作用。而NOx的脱除取决于放电过程,放电前的脱除几乎可以忽略不计。在脱除过程中,适量的SO2能够提高NOx的脱除,最大能使NOx脱除率提高25%,但过高的SO2又使NOx的脱除趋于减少。不同SO2初始浓度下NOx脱除率的变化主要归因于SO2和NO2之间的反应。NO初始浓度的变化对SO2的脱除影响较小。烟气成分的变化对SO2和NOx的脱除影响也不明显。在脱硫脱硝过程中,观察到的白色晶体状物质主要成分是硫酸铵和硝酸铵。Experiments of simultaneously removing SO2 and NOx by using corona discharge radical shower technology were conducted. The reactive characteristics and the mechanism of the mutual influence between pollutants on the removal effect were studied especially. The results show that with 0.042 L·min^-1 NH3, 50% SO2 can be removed without using discharge, however, using corona discharge can further improve SO2 removal to a certain extent. Without discharge, the removal of NOx can nearly be ignored and its removal depends on the corona discharge process. With appropriate SO2 content, the NOx removal can be improved and its maximum removal rate increase can reach 25%. However, overmuch SO2 content will restrain NOx removal. The change of NOx removal rate with different SO2 initial concentrations is attributed to the reaction between SO2 and NO2. The NO initial concentration has little effect on SO2 removal, and the components of flue gas have no significant effect on SO2 and NOx removal too. The X-ray diffraction analysis shows that the created white crystal substances observed in the experiments are （NH4）2SO4 and NH4NO3.

关 键 词：电晕 自由基簇射 电催化氧化 脱硫 脱硝 

分 类 号：TQ534.9[化学工程—煤化学工程] X701.7[环境科学与工程—环境工程]