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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* X4 }) C# l/ l$ I
. U3 P' q( a/ Z- l& r V |) l
吴祖良,高翔,骆仲泱,倪明江,岑可法
9 C, g+ d+ n# P0 m% }(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 W i# V( x' b4 N% y: r
. w) k. f {( t' f$ O% c* ~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
# d6 U5 G! e# Q- o: D! V8 U/ x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0 B$ c+ T P% U6 W
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. Z/ ~; z% k {& @) a! ?: ?
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。
% {% S$ w* V2 Q. [6 Q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1 x8 F1 b5 c0 E; b+ e& K% }$ F
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; C1 h& a O% [' f
酸铵和硝酸铵。% T& b" L+ a7 I" ~5 _
关键词：电晕；自由基簇射；电催化氧化；脱硫；脱硝
* }; r+ V% X9 e0 r/ X中图分类号：TQ534.9；X701.7文献标识码：A9 x) L5 l$ [+ U' @2 ~0 F
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Reactive Characteristics and Mechanism of the SO2 and NOx Simultaneous Removal
- d& |: b9 z* ]2 n5 D4 DProcess Using a Radical Shower Electro-Catalytic Oxidation System
: f7 R9 r& Y5 `. [; O" U QWU Zu-liang,GAO Xiang,LUO Zhong-yang,NI Ming-jiang,CEN Ke-fa
5 i4 o8 b9 C( z5 _' x2 }6 s7 m(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)
& V7 Z0 q) ?. QAbstract:Experiments of simultaneously removing SO2 and NOx by using corona discharge radical shower
5 A+ C6 D* s/ C# P5 Z( r# M" Otechnology were conducted.The reactive characteristics and the mechanism of the mutual influence between. |- I2 W0 J Z/ d2 {' Y
pollutants on the removal effect were studied especially.The results show that with 0.042 L·min/ f. f- u1 ^$ b- n( y5 w
?1% m' j9 B2 c3 N) D7 r: I$ u& D
NH3,50%
" b# f* k: x9 fSO2 can be removed without using discharge,however,using corona discharge can further improve SO2
. Z7 @' A& g8 h0 }# Eremoval to a certain extent.Without discharge,the removal of NOx can nearly be ignored and its removal
: L7 e3 p: q% s; s" Hdepends on the corona discharge process.With appropriate SO2 content,the NOx removal can be improved and/ \! X) Q" H4 U6 G* y, B
its maximum removal rate increase can reach 25%.However,overmuch SO2 content will restrain NOx removal.
1 T; j. T% N) `/ s9 |; l7 wThe change of NOx removal rate with different SO2 initial concentrations is attributed to the reaction between
+ W7 b6 B5 u0 n# V" Y9 V5 cSO2 and NO2.The NO initial concentration has little effect on SO2 removal,and the components of flue gas/ f4 a1 A8 ?$ H3 W
have no significant effect on SO2 and NOx removal too.The X-ray diffraction analysis shows that the created! p* b% x% O z, z% C9 f9 s
white crystal substances observed in the experiments are(NH4)2SO4 and NH4NO3.
. c5 Q- M2 W+ {$ O# T+ \2 WKey words:corona;radical shower;electro-catalytic oxidation;desulfurization;denitrification |
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发表于 2009-8-31 11:54:47
