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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
6 b3 i5 r' y. A8 h. J3 `5 d
5 I& A/ r& n% i/ k吴祖良,高翔,骆仲泱,倪明江,岑可法
5 k- ]2 b9 f5 p) T(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)
1 b" ^7 y( I1 I2 C" k; @$ y" L, ]3 V2 b+ D. S! }' H
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" t' x2 C: r9 g! K9 x* B1 o
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
6 ~7 t% ^( i9 r6 E3 k8 x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
) z2 l9 e; T1 P8 G1 v9 P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。
4 K q9 u5 K# u8 \; m- s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
+ C* G/ n* K3 @/ {, G. G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9 m2 t5 c, z5 \; w0 w% h
酸铵和硝酸铵。
, \2 L5 @+ b, A3 g: l+ m关键词：电晕；自由基簇射；电催化氧化；脱硫；脱硝& ~1 `* ]" B" p7 l
中图分类号：TQ534.9；X701.7文献标识码：A
1 s* x! e" ?9 n3 j7 _# }5 Y6 }
7 S2 T, W8 a& r, ?Reactive Characteristics and Mechanism of the SO2 and NOx Simultaneous Removal1 V; m+ t3 r/ t8 [8 i; V/ Y; a+ G
Process Using a Radical Shower Electro-Catalytic Oxidation System
+ s0 q. s( f9 R0 O8 Z2 K# r% GWU Zu-liang,GAO Xiang,LUO Zhong-yang,NI Ming-jiang,CEN Ke-fa7 B; e3 M- x1 X- k' S/ t' ^/ X# T
(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China): {; g; q+ e4 j
Abstract:Experiments of simultaneously removing SO2 and NOx by using corona discharge radical shower% a- A4 ^* H( r2 @8 v
technology were conducted.The reactive characteristics and the mechanism of the mutual influence between
! n! X3 z' m( L/ d7 Y9 Upollutants on the removal effect were studied especially.The results show that with 0.042 L·min+ _* c4 M% G4 R
?1) d+ S$ d# i6 Y5 M2 ^3 l
NH3,50%- J# `" g [- X. L* z' I
SO2 can be removed without using discharge,however,using corona discharge can further improve SO2
/ `; h0 g0 M+ h1 ]: o% X' k4 gremoval to a certain extent.Without discharge,the removal of NOx can nearly be ignored and its removal
: A1 M8 x! F. Q1 Rdepends on the corona discharge process.With appropriate SO2 content,the NOx removal can be improved and
( | o. a e. ?7 p2 k+ z& N/ ]its maximum removal rate increase can reach 25%.However,overmuch SO2 content will restrain NOx removal.
! }5 i X9 p: z3 \* T3 h9 o4 B# v% OThe change of NOx removal rate with different SO2 initial concentrations is attributed to the reaction between' y' P, H( u0 M2 c
SO2 and NO2.The NO initial concentration has little effect on SO2 removal,and the components of flue gas, v* N8 y X0 r$ t# i/ M
have no significant effect on SO2 and NOx removal too.The X-ray diffraction analysis shows that the created+ z) e8 h9 ]$ T" p: U6 _
white crystal substances observed in the experiments are(NH4)2SO4 and NH4NO3.
! {1 B6 J$ c2 e+ X5 fKey words:corona;radical shower;electro-catalytic oxidation;desulfurization;denitrification |
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发表于 2009-8-31 11:54:47
