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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1 m! {5 B' x8 s! O( D; d, f
j c7 w! k( O# n吴祖良,高翔,骆仲泱,倪明江,岑可法" @2 G/ B' v9 D$ F- k5 Z2 @$ N( x* g
(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)
: X9 T* W1 X* U( c; O8 m+ h
n- u* I* i% g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
; _/ E; N; H3 S) o- L6 z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2 D- N' {! T. b, ^; {* 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6 F) g; }; H& ~: m) 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。
8 B4 t/ Y! V: r* 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1 h' k1 }4 x; Z. 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
/ ?& o4 X2 _) A) U9 \, o9 k, n8 ?# m* g酸铵和硝酸铵。
1 }3 [+ c9 F* c: G# @, O% D关键词：电晕；自由基簇射；电催化氧化；脱硫；脱硝
, F; X; G! c- _1 X0 K5 T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
+ J. _" f& K2 T6 \8 h% uProcess Using a Radical Shower Electro-Catalytic Oxidation System
: X; z" |' F# [WU Zu-liang,GAO Xiang,LUO Zhong-yang,NI Ming-jiang,CEN Ke-fa
! d/ G$ {. k8 ^0 T# a8 |; v(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)
, {( H; i5 H2 qAbstract:Experiments of simultaneously removing SO2 and NOx by using corona discharge radical shower$ @* f7 ]2 u9 Y/ w
technology were conducted.The reactive characteristics and the mechanism of the mutual influence between
) r6 p3 i6 v3 b9 M q$ Rpollutants on the removal effect were studied especially.The results show that with 0.042 L·min
& a/ t8 v4 f: s, J* \: c?1% ^; E! T) b. X" ]" `
NH3,50%) P$ L3 s2 F" M$ z
SO2 can be removed without using discharge,however,using corona discharge can further improve SO2
( S- v. @' a2 M) \removal to a certain extent.Without discharge,the removal of NOx can nearly be ignored and its removal
5 m; f* E3 i5 k+ E1 ]depends on the corona discharge process.With appropriate SO2 content,the NOx removal can be improved and$ s8 q. L, ?/ ^: P
its maximum removal rate increase can reach 25%.However,overmuch SO2 content will restrain NOx removal.+ Q+ o; f, ~* L
The change of NOx removal rate with different SO2 initial concentrations is attributed to the reaction between
3 x4 F2 ]2 X* fSO2 and NO2.The NO initial concentration has little effect on SO2 removal,and the components of flue gas+ ~4 p) l7 W- j) R; e% @3 M- m
have no significant effect on SO2 and NOx removal too.The X-ray diffraction analysis shows that the created+ P# j# M g1 }' p N& K% x! E- K
white crystal substances observed in the experiments are(NH4)2SO4 and NH4NO3.
N; u: N2 L- N. L! A8 `! wKey words:corona;radical shower;electro-catalytic oxidation;desulfurization;denitrification |
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发表于 2009-8-31 11:54:47
