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1、http://www.paper.edu.cnApplicationofRTDforMeasuringDispersionCoefficientandVelocity∗TongwangZhang,TiefengWang,JinfuWang(BeijingKeyLabofGreenReactionEngineering&Technology,TsinghuaUniversity,Beijing100084,China)AbstractAlthoughmuchresearchhadbeenfocusedonthet
2、ailofRTD,fewattentionswerepaidtotheeffectofwhitenoiseonthemeasurementresults.Thewhitenoisewasunavoidableinexperiment.Differentliquidvelocityanddispersioncoefficientwouldbeobtainedfromthesamerawexperimentaldatabyusingdifferentdataprocessingmethods.Itisimporta
3、nttoinvestigatetheeffectofwhitenoiseonthecalculatedparametersbyusingdifferentdataprocessingmethods.Theanti-disturbanceabilityofmomentmethodandleastsquaremethodwereinvestigated.Itshowedthattheanti-disturbanceabilityoftheleastsquaremethodisbetterthanthatofthem
4、omentmethod.BecauseofthepeakoverlappinginRTDcurveofloopreactor,momentmethodcannotbeusedtocalculateliquidvelocityanddispersioncoefficient,whiletheleastsquaremethodisstillavailable.Experimentwascarriedouttoexaminethepracticabilityoftheleastsquaremethodinloopre
5、actor.Itwasshownthattheleastsquaremethodissuitabletocalculatetheliquidvelocityanddispersioncoefficientinloopreactor.KeywordRTD,Momentmethod,Leastsquaremethod,dispersioncoefficient,liquidcirculatingvelocity1.IntroductionTheconceptofresidencetimedistribution(R
6、TD)isanimportantissueforreactordesignandscaleup.SeveralmodelshavebeenproposedinthepastdecadesbydifferentresearchersfordescribingthemeasuredRTDdata,someexamplesbeingthedispersionmodel,thecross-flowmodel,thegammadistributiontimedelaymodelandthemodifiedexponent
7、iallydistributedtimedelaymodel.ThedispersionmodelisthemostcommonusedtodescribethemeasuredRTDdatainpackedbedandfluidizedbed.TheparametersinthesemodelsareusuallyestimatedonthebasisofexperimentalRTDdata[1].∗Correspondenceauthor,Fax:010-62772051,E-mail:wangjf@fl
8、otu.orghttp://www.paper.edu.cnTracerinjectionandresponsemethodhasbeenusedtostudythemixingcharacteristicsofreactors.Techniquessuchasmomentmethodandcurve-fittinginthefrequencyorthetimedomainarethe
