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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
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吴祖良,高翔,骆仲泱,倪明江,岑可法
3 B* B0 y+ z" }2 G. `4 D(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)4 c# s6 M. ~! U c
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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* ?3 w s8 j( I) }4 |
和NOx脱除的反应特性和相互影响机理。结果表明：在0.042 L?min?1的氨气注入下，50%的SO2在放电前被脱除，但
7 C; |$ G: R; [! `9 l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 M* w) } ?6 e; r
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。
% J% K' k. P4 m7 ]. J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5 ^! y/ p% v2 b* U. O
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
/ K1 Y8 }9 y: ^2 _酸铵和硝酸铵。& m* \, X7 d+ W X, |7 k
关键词：电晕；自由基簇射；电催化氧化；脱硫；脱硝
: ^7 [( }( c, m4 X中图分类号：TQ534.9；X701.7文献标识码：A
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Reactive Characteristics and Mechanism of the SO2 and NOx Simultaneous Removal& k3 D; h1 E/ ?0 |3 P6 @$ g( X
Process Using a Radical Shower Electro-Catalytic Oxidation System
2 o$ G8 U! W( q* g4 v# @WU Zu-liang,GAO Xiang,LUO Zhong-yang,NI Ming-jiang,CEN Ke-fa0 n" K4 R0 g: {8 Y& P& S
(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)* N, ]. j4 s- z5 O. n Q* P) ]2 y9 w
Abstract:Experiments of simultaneously removing SO2 and NOx by using corona discharge radical shower% r0 B. S8 c( t& K
technology were conducted.The reactive characteristics and the mechanism of the mutual influence between1 I$ Z# b$ R5 ]1 Q+ j* Z2 r1 Q
pollutants on the removal effect were studied especially.The results show that with 0.042 L·min
! {" ~, e2 e8 c# d?1
: D- f) e3 i$ Y; r5 `( i- eNH3,50%; I& G8 J/ k- Z9 h% G0 u
SO2 can be removed without using discharge,however,using corona discharge can further improve SO2) d1 b3 {" V& K5 x; @) S. H
removal to a certain extent.Without discharge,the removal of NOx can nearly be ignored and its removal
# m/ y7 g9 V8 G8 _, o7 Udepends on the corona discharge process.With appropriate SO2 content,the NOx removal can be improved and0 E- f a/ f% \& M% f6 }5 G# b6 `
its maximum removal rate increase can reach 25%.However,overmuch SO2 content will restrain NOx removal.
; A4 F u4 S3 Z1 h) EThe change of NOx removal rate with different SO2 initial concentrations is attributed to the reaction between
% m1 L& o5 o! V' `; A5 b DSO2 and NO2.The NO initial concentration has little effect on SO2 removal,and the components of flue gas
5 A+ v% y9 ~! f) _1 \7 ? p% w `have no significant effect on SO2 and NOx removal too.The X-ray diffraction analysis shows that the created2 {9 C. R9 e: F
white crystal substances observed in the experiments are(NH4)2SO4 and NH4NO3.% c* N- S2 k/ |, O2 @$ q
Key words:corona;radical shower;electro-catalytic oxidation;desulfurization;denitrification |
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发表于 2009-8-31 11:54:47
