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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
3 s6 B, X" m* R+ K+ q; B% w/ d& r2 X0 S) k8 L- z3 h3 d8 U' ~
吴祖良,高翔,骆仲泱,倪明江,岑可法8 ~+ _0 W! m0 K1 {$ h3 m, V; ^
(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)7 r9 g* a2 H5 K5 }* P
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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SO28 E) ]+ T* E& h8 F: H+ T7 Z& l/ d
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$ v! D( g; E/ C; G; I( B8 ]3 ~4 P
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+ a3 Y3 x# ?$ k. K" c
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。; v3 _5 f! {9 Z
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0 E& G' B' g; o* s- V7 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9 w1 S/ m8 f# L& ]. U2 a- p3 @
酸铵和硝酸铵。# P. }- h# N7 j" \' u A+ a* u
关键词：电晕；自由基簇射；电催化氧化；脱硫；脱硝
7 l' K% k4 L1 K2 S中图分类号：TQ534.9；X701.7文献标识码：A, S( _) ?" }' a
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Reactive Characteristics and Mechanism of the SO2 and NOx Simultaneous Removal
7 Z2 |, G5 L5 ]' q. hProcess Using a Radical Shower Electro-Catalytic Oxidation System2 ^) `% q3 n8 Z+ _& O- M" ?
WU Zu-liang,GAO Xiang,LUO Zhong-yang,NI Ming-jiang,CEN Ke-fa& q: G1 d7 L0 ]. B2 ]! m
(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)
3 j1 A+ D+ ]0 H3 X. |Abstract:Experiments of simultaneously removing SO2 and NOx by using corona discharge radical shower, o1 e/ x- Q0 W
technology were conducted.The reactive characteristics and the mechanism of the mutual influence between
3 D( b8 x" [: qpollutants on the removal effect were studied especially.The results show that with 0.042 L·min
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' q& z+ R% F1 {NH3,50%
& q( F$ f5 O1 @4 q/ [SO2 can be removed without using discharge,however,using corona discharge can further improve SO2
" n% V# J7 `( q, R3 y! g9 z* B: i4 _removal to a certain extent.Without discharge,the removal of NOx can nearly be ignored and its removal
, Z2 g6 z; d Jdepends on the corona discharge process.With appropriate SO2 content,the NOx removal can be improved and
8 q0 o" @9 D' {4 W2 ] Gits maximum removal rate increase can reach 25%.However,overmuch SO2 content will restrain NOx removal.. p7 z" h: W# i! W
The change of NOx removal rate with different SO2 initial concentrations is attributed to the reaction between
7 o+ O7 D6 }: [: u" F. ZSO2 and NO2.The NO initial concentration has little effect on SO2 removal,and the components of flue gas
; [* S: W! _/ N v v6 i3 Whave no significant effect on SO2 and NOx removal too.The X-ray diffraction analysis shows that the created
, k( N h( u2 f9 k2 Vwhite crystal substances observed in the experiments are(NH4)2SO4 and NH4NO3.
U0 C, R9 }, l3 r4 |: wKey words:corona;radical shower;electro-catalytic oxidation;desulfurization;denitrification |
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发表于 2009-8-31 11:54:47
