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时间:2020-03-28
《燃煤电厂选择性催化还原烟气脱硝系统的性能试验.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第30卷第6期动力工程学报V01.30No.62010年6,ElJournalofChineseSocietyofPowerEngineeringJune2010文章编号:1674—7607(2010)06—0439—05中图分类号:X511文献标识码:A学科分类号:610.30燃煤电厂选择性催化还原烟气脱硝系统的性能试验徐旭1,应剑2,王新龙3(1.中国计量学院计量测试工程学院,杭州310018;2.浙江省电力试验研究院,杭州310014;3.萧山发电厂,杭州311251)摘要:在420t/h电站燃煤锅炉尾部建立了选择性催化还原脱硝工业性试验装置,重点研究了NH。/N0。摩尔比、反应温度、反
2、应空速等因素对烟气脱硝效率的影响.结果表明:当NH。/Nq摩尔比小于1时,脱硝效率随着NH。/Nq摩尔比的增大而提高;当NH。/N0:摩尔比大于1时,随着NH。/N0,摩尔比的增大,脱硝效率变化不明显;当NH。/NO。摩尔比为0.9、反应温度为325~350℃时,脱硝效率达到90%;当空速小于4760h叫时,随着空速提高,脱硝效率基本不变;当空速大于4760h。1后,脱硝效率随空速提高迅速降低.试验研究还发现:氨逃逸量随着NH。/NO。摩尔比的增大而逐渐增大;当NH。/NO。摩尔比小于0.95时,氨逃逸量均能满足设计要求;在325~350℃内,S02/SO。转化率随反应温度的升高而提高,且均小
3、于0.6%,符合设计要求.关键词:燃煤电厂;选择性催化还原;性能试验;氮氧化物;氨逃逸PerformanceTestofaSCRDenitrificationSystemforCoal—firedPowerPlantsXUXul,YINGJian2,WANGXin—long3(1.CollegeofMetrologyandMeasurementEngineering,ChinaJiliangUniversity,Hangzhou310018,China;2.ZhejiangElectricPowerTest8LResearchInstitute,Hangzhou310014,China;3.X
4、iaoshanPowerPlant,Hangzhou311251,China)Abstract:Aseriesofexperimentaltestswereconductedtostudytheperformanceofaselectivecatalyticre—duction(SCR)fluegasdenitrificationsystemfora420t/hcoal—firedboiler,withfocusontheinfluenceofNH3/N0:molarratio,reactiontemperatureandspacevelocityonitsdenitrificationeff
5、iciency.ResultsshowthatwhenthemolarratioofNH3/Nqislessthan1,thedenitrificationefficiencywillrisewithgrowingmolarratioofNH3/NO;;andwhenthemolarratioislargerthan1,thedenitrificationefficiencywillnearlyremainthesame:whereaswhenthemolarratioiS0.9andthereactiontemperatureliesin325—350。C,thedenitrificatio
6、nefficiencymayreach90%.Thedenitrificationefficiencywillbasicallyremainthesamewithrisingspacevelocitywhenthelatteroneislessthan4760h~.butdroprapidlywhentheveloc—itygetslargerthan4760h一.TheNH3escaperatewillrisewithgrowingmolarratioofNH3/NO,,andifthemolarratiokeepsbelow0.95,thedesignrequirementofNH3esc
7、aperatecanbesatisfied.Within325—350℃,theconversionrateofS02/s03willrisewiththegrowthoftemperature,whichistobekeptbelow0.6%,meaningthedesignrequirementcanbemet.Keywords:coal—firedpowerplant;selectiveca
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