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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 _- O1 i& ^" F1 @& o
/ R8 m. R! Q; Q$ g0 a吴祖良,高翔,骆仲泱,倪明江,岑可法
5 e: ~+ `( q9 d; F3 p# r& J(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)
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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/ x: I1 R' _# p* u
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' O9 t; Q4 t9 j
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
}1 Q' J7 c) T* c: w, ?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。6 S2 c$ L/ N1 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
/ L# F% M8 b& n8 ~8 y5 [9 }; n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6 z6 o, d% J" l1 T
酸铵和硝酸铵。+ J9 ~6 f2 D) x) |9 [+ d6 _- P
关键词：电晕；自由基簇射；电催化氧化；脱硫；脱硝2 t5 v# A$ D1 N& b
中图分类号：TQ534.9；X701.7文献标识码：A
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% e) w5 ?9 K1 j, ?; I KReactive Characteristics and Mechanism of the SO2 and NOx Simultaneous Removal% c4 d: _- D5 x
Process Using a Radical Shower Electro-Catalytic Oxidation System
- c) t( I! i+ S* `WU Zu-liang,GAO Xiang,LUO Zhong-yang,NI Ming-jiang,CEN Ke-fa" x7 N5 [: X; h/ ~4 d2 x$ M4 d$ U
(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)/ z B( l, g: C! G2 n; R7 ?, ]9 d7 M
Abstract:Experiments of simultaneously removing SO2 and NOx by using corona discharge radical shower
% [! X3 ~* y6 O6 i, Atechnology were conducted.The reactive characteristics and the mechanism of the mutual influence between
, s) z/ K# Y2 E- E& X- c4 O) W4 ? |' rpollutants on the removal effect were studied especially.The results show that with 0.042 L·min, t: i0 _& T- A- h% A, A
?14 Z+ p9 @( e; O/ U4 H( }! Z
NH3,50%; T4 a3 J/ G5 o, f, } Z; Y& W
SO2 can be removed without using discharge,however,using corona discharge can further improve SO23 n' S y4 Z+ ^ {2 N
removal to a certain extent.Without discharge,the removal of NOx can nearly be ignored and its removal
* a$ X7 l" J) T1 x! U& f2 u/ Ldepends on the corona discharge process.With appropriate SO2 content,the NOx removal can be improved and
8 r1 C/ l/ `! v4 H' P& Iits maximum removal rate increase can reach 25%.However,overmuch SO2 content will restrain NOx removal.3 `- m( P$ A# k- x5 }
The change of NOx removal rate with different SO2 initial concentrations is attributed to the reaction between3 F4 ]6 j! k+ m; X/ N) O4 y
SO2 and NO2.The NO initial concentration has little effect on SO2 removal,and the components of flue gas7 T# q2 q3 i/ X; L
have no significant effect on SO2 and NOx removal too.The X-ray diffraction analysis shows that the created
& O7 G- J4 y2 J* T& Pwhite crystal substances observed in the experiments are(NH4)2SO4 and NH4NO3.3 f8 e$ r1 n, z; [& i
Key words:corona;radical shower;electro-catalytic oxidation;desulfurization;denitrification |
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发表于 2009-8-31 11:54:47
