放电低温等离子体烟气脱硫反应器研究.doc
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放电低温等离子体烟气脱硫反应器研究
一电晕放电氨气、水蒸气活化烟气脱硫和脉冲放电电极配置研究
计:
学位论文:
66页
7个
40幅
格图
表插
论文完成日期:
2004年3月3日
评阅人:
指导教师:
李杰副教授
教研室主任:
李国锋副教授
系主任:
吴彦教授
论文答辩日期:
2004年3月17日
摘要
由于脉冲电晕放电等离子体烟气脱硫脱氮工艺具有传统方法所不具有的优点,因而
成为近年来中外学者研究的热门课题之一。
但大功率高压脉冲电源和烟气脱硫的能量效
率是制约此技术工业应用的两个主要原因,因此本文进行了直流电晕放电氨气、水蒸气
活化的烟气脱硫实验和脉冲放电脱硫反应器电极结构的优化配置研究。
实验研究了直流
电晕放电过程中离子电流和OH自由基生成的影响因素和直流电晕放电氨气和水蒸气活
化烟气脱硫效率的影响因素,得到了设计直流电晕放电氨气、水蒸气同时活化的烟气脱
硫反应器所需的数据和参数;同时,研究了脉冲放电烟气脱硫反应器的电极结构对一次
流光能量、峰值电压等的影响,得到一些有用的结论。
本文主要的实验结论如下:
1.在离子电流测试实验中,离子电流随活化电压的升高而增大;测试装置风速约
为0.5m/s时,气流中的离子数目衰减一半的距离约为9cmo
2.利用二氧化硫与OH自由基的氧化反应测试了直流电晕放电过程中生成的014自
由基的数量。
在本实验条件下,二氧化硫浓度为2000ppm,空气湿度为4.7%(w%),活化
电极注入功率为1.9W-2.9W时,测得的OH自由基数量级为10''/cm`o
3,针直径、水蒸气和氨气影响活化电极的放电特性。
针直径减小和活化电压升高
增大电晕电流;水蒸气和氨气降低电晕电流。
4.活化电压、氨气和二氧化硫的摩尔比(R),氨气从放电针的喷出速度、烟气停
留时间、湿度等因素影响直流电晕放电氨气活化的烟气脱硫效果。
本实验条件下,烟气
脱硫效率随活化电压、R、湿度的增大和烟气停留时间的延长而升高;直流电晕放电氨
气活化时,每根针的喷气速度为0.13m/s-0.16m/s比较合适。
5.活化电压、烟气停留时间、水蒸气流量、放电针的内径影响直流电晕放电水蒸
气活化时的烟气脱硫效果。
本实验条件下,活化电压升高、烟气停留时间延长提高烟气
脱硫效率;针内径为1mm的活化电极的烟气脱硫效率高于针内径为3mm的活化电极的烟
气脱硫效率;烟气脱硫效率随水蒸气流量增大而升高,水蒸气活化时,每根针的喷气速
度应大于3.54m/s。
6.根据实验数据,设计了一台烟气处理量为20000NmA,二氧化硫初始浓度为
2000ppm的直流电晕放电水蒸气和氨气同时活化的烟气脱硫反应器。
7.研究了脉冲电晕放电等离子体烟气脱硫反应器的电极结构配置和放电特性,线-
线间距(b)和板一板间距(d)满足关系b/d=0.4-0.6时,注入反应器的一次流光脉冲能
量比较大。
关键词:
直流电晕放电,氨气活化,水蒸气活化,脱硫反应器,电极结构,放电特性
Abstract
Thedesulphurizationanddenitrificationprocessbypulseddischargeplasmatechnology
hasbeentherecentresearchfocusbecauseofitsadvantagesovertraditionaltreatment
methodsforfluegas.Buttherearetwomainbottlenecks,thelargescalepulsedhigh-voltage
powerandtheenergyefficiency,restrainingthetechnologyforindustrialapplication.Sothe
desulphurizationprocessutilizingactivatedammoniaandwatervaporbyDCcorona
dischargeandappropriateelectrodeconfigurationofpulseddischargereactorareinvestigated.
Thefactorsinfluencingtheions'currentandthenumberofOHradicalsproducedbyDC
coronadischargeareinvestigated,andthoseinfluencingthedesulphurizationefficiencyinthe
processofammoniaandwatervaporactivationarealsostudied,someusefuldataand
parametersfordesi娜ngadeS02reactorwiththeprocessofactivatedammoniaandwater
vaporaregained.Experimentalstudyonelectrodeconfigurationanddischargecharacteristics
ofapulseddischargereactorisfinished,andsomeusefulinformationisgained.
Themainexperimentalconclusionsgainedaresummarizedbelow:
1.Inourexperimentsformeasuringions'current,ions'currentproducedbyDCcorona
dischargeincreaseswithhighervoltage;andions'currentintheairdecreasedhalfatthe
distanceof9cmtotheactivationelectrodewhenthevelocityofairis0.5m/s.
2.ThenumberofOHradicalsproducedbyDCcoronadischargehasbeenmeasured
utilizingtheoxidationreactionbetweenhydroxylradicalsandsulfurdioxide.Inour
experiments,whenpowerinfusedintoactivationelectrodesbetween1.9Wand2.9W,vapor
contentandinitialconcentrationofsulfurdioxidebeing4.7%(w%)and2000ppmrespectively,
thenumberofhydroxylradicalsdetectedisabout1015/cm3.
3.Thedischargecharacteristicsofactivationelectrodesareinfluencedbydiameterof
needles,watervaporandammonia.Thecoronacurrentincreaseswiththinnerdiameterand
highervoltage,andammoniaandwatervapordecreasesthecoronacurrent.
4.Whenusingammonia-activatingprocess,thedesulphurizationefficiencyisinfluenced
bythesefactors,suchasactivationvoltage;molratio(R)betweenS02andNH3,ejection
velocityofammoniafromneedles,residencetimeandhumidityofthefluegas.The
desulphurizationefficiencybeforeandafteractivationincreaseswithhighervoltage,humidity,
Randlongerresidencetime;inourexperiments,theappropriateejectionvelocityofammonia
fromneedlesisbetween0.13m/sand0.16m/s.
5.Whenusingwatervaporactivatingprocess,thedesulphurizationefficiencyis
influencedbyactivationvoltage,residencetimeofthefluegas,andfluxofwatervaporand
diameterofdischargeneedles.Thedesulphurizationefficiencyincreaseswithhigher
activationvoltageandlongerresidencetime;inourexperiments,thedeS02efficiencyusing
dischargeneedleswithinnerdiameteroflmmishigherthanthatwithinnerdiameterof3mm;
thedeS02efficiencybeforeactivationincreaseswithbiggerfluxofwatervapor,whenwater
vaporactivated,theejectionvelocityofvaporshouldexceed3.54m/s.
6.Accordingtoourexperimentalconclusionsgainedinpreviouschapters,adeS02
reactorwithfluxof20000Nm3/hoffluegasandinitialconcentrationof2000ppmusingthe
processofsimultaneouslyactivatedammoniaandwatervaporbyDCcoronadischargeis
designed.
7.TheelectrodeconfigurationanddischargecharacteristicsofapulseddischargedeS02
reactorarestudiedandsomeusefulinformationisgained.Inourexperiments,When
wire-to-wirespacing(b)andplate-to-platespacing(d)satisfytherelation:
b/d=0.40.6,
primarystreamerenergyinfusedintothereactorwasgreater.
!
ndexwords:
DCcoronadischarge,Ammoniaactivation,Watervaporactivation,
Desulphurizationreactor,Electrodeconfiguration,Dischargecharacteristics
III
目录
摘要··········································,·····················································……I
Abstract...·······················································································……II
第一章绪论·.........................................................................................1
1.1研究电晕放电低温等离子体烟气脱硫技术的目的和意义·..........................1
1.2电晕放电等离子体烟气脱硫技术的国内外研究现状·................................3
1.3电晕放电等离子体烟气脱硫技术的研究进展·...............................................4
1.3.1反应动力学和反应机理的研究综述·..................................................5
1.3.2脉冲电源和脱硫反应器的研究综述·..................................................6
1.3.3烟气反应条件的研究综述·..............................................................6
1.4本论文的选题依据和研究内容·.................................................................8
本章参考文献·.........................................................................................10
第二章直流电晕放电生成的离子和OH自由基测试·................................13
2.1前言·..................................................................................................13
2.2实验装置及参数测量·.............................................................................14
2.3直流电晕放电生成的离子电流的测试·........................................................16
2.3.1活化电压对离子电流的影响,.................................................................15
2.3.2水蒸气流量对离子电流大小的影响·.....................................................16
2.3.3离子接收电极和活化电极间距对离子电流的影响·......................................17
2.4OH自由基的定量测试及结果分析·...........................................................18
2.4.1二氧化硫浓度对二氧化硫脱除数量的影响·............................................18
2.4.2水蒸气含量对二氧化硫脱除数量的影响·...............................................19
2.4.3注入能量和生成的01-1自由基数量的关系·................................................19
2.4.4实验结果的误差分析·..........................................................................21
2.5本章小结·............................................................................................22
本章参考文献·.........................................................................................23
第三章直流电晕放电氨气活化烟气脱硫的实验研究·.............................24
3.1前言·..................................................................................................24
3.2实验装置和参数测量·.............................................................................24
3.15直流电晕放电氨气活化烟气脱硫的实验结果·...............................................26
3.3.1活化电极的I/V放电特性·....................................................................27
3.3.2活化电压与烟气脱硫效率的关系·........................................................2g
3.3.3氨气和二氧化硫摩尔比(R)与烟气脱硫效率的关系·................................29
3.3.4活化电极的针数目与烟气脱硫效率的关系·............................................3p
;8.3.5湿度与烟气脱硫效率的关系·..............................................................3U
3.3.6风量与烟气脱硫效率的关系·.................................................................31
6.4本章小结·............................................................................................32
本章参考文献·.........................................................................................33
第四章直流电晕放电水蒸气活化烟气脱硫的实验研究·..........................34
4.1前言·..................................................................................................34
4.2实验装置和参数测量·.............................................................................34
4.3直流电晕放电水蒸气活化烟气脱硫的实验结果·.........................................36
4.3.1水蒸气活化电极的I/V特性·........................................................,........36
4.3.2活化电极的针直径对烟气脱硫效果的影响·...............................................37
4.3.3活化电压与烟气脱硫效率的关系·...........................................................38
4.3.4水蒸气流量与烟气脱硫效率的关系·........................................................38
4.3.5风量对烟气脱硫效率的影响·.................................................................49
4.4本章小结·............................................................................................;11
本章参考文献·.........................................................................................42
第五章直流电晕放电氨气和水蒸气活化烟气脱硫反应器设计·..............43
5.1前言·..................................................................................................43
5.2设计依据和反应器主要参数的计算·...........................................................43
5.2.1设计原则及依据·................................................................................43
5.2.2反应器主要参数的计算·.......................................................................44
5.3反应器的尺寸和设计简图·......................................................................47
5.4本章小结·.....................................................................