application 150 en 2 - krohne
TRANSCRIPT
Level Measurement of Biodiesel in a tank farm
•Highaccuracyandrepeatabilityforoptimisedtankfarminventory•One-stop-solutionforovera100tanks•Factorycalibrationforhighestmeasurementrequirements
1. BackgroundBiodieselandotherrenewableenergieshavebecomeanimportantissueworldwidewiththerisingpricesoffossilfuel.ArecentlybuiltEuropeantankfarmwithmorethan100stainlesssteeltanksprovidesastoragecapacityofover100000m3.Theplantuseswasteflowsfromvariousprocessesasrawmaterialsforotherprocesses–inordertoproducebiofuelandgreenpoweronalargescale.Itsbiodieselproductionispartiallybasedonwastecookingoilsandfatsfromthecateringindustry.
2. Measurement requirements
Theplantrunswithafullyautomatedtankinventorysystemandwaslookingforcost-effectiveandaccurateleveldevicescapableofmeasuringthelowreflectivemediumof108fueltankswithgreatrepeatability.Thedeviceshadtocomepre-calibratedtoreachanaccuracyof±2mm(on20m)withrepeatabilitybetterthan1mmandshouldnotbeaffectedbyvariationsindielectricconstant.
APPLICATION NOTE Energy
Application 150 EN 2.indd 1 21.03.2011 11:51:03 Uhr
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3. KROHNE solution
Forthisapplication,KROHNEdelivered108OPTIFLEX1300C2-wireguidedradar(TDR)levelmeters.Thesewereequippedwith4mmdiametersinglecableprobeswithalengthof20m.ConnectiontypewasG¾”AISO228.EachdevicereceivedspecificfactorycalibrationonKROHNEindustrialcalibrationrigstoreachthecustomerrequirementsintermsofaccuracyandrepeatability.
AlthoughtheTDR(TimeDomainReflectory)principlereliesonthedielectricconstantofthemedium,themetersarenotaffectedbyvariationsinproductcharacteristics:fittedonthetankroof,themetertransmitslow-intensityelectromagneticpulsesalongitscableprobe.Thesepulsesmoveatthespeedoflight.Whenthepulsesreachthesurfaceoftheproducttobemeasured,theyarereflectedwithanintensitythatdependsonthedielectricconstant(εr)oftheproduct.Thedevicemeasuresthetimebetweenemissionandreceptionofthepulse:halfofthistimeisequivalenttothedistancefromthereferencepointofthedevicetothesurfaceoftheproduct.Thetimevalueisconvertedintoacurrentoutputof4...20mAand/oradigitalsignalandtransmittedtothecontrolroomtotrackthefuelstockofeachtank.
4. Customer benefits
Inthisapplication,highmeasurementrequirementswerefullymetwitharobusttechnologyatacompetitiveprice.Byinstallingjustonedeviceoneachofthe108tanks,thecustomereasilymonitorsthebiodieselstockinthewholetankfarm.Withameasurementaccuracyof±0.01%andrepeatabilityhigherthan1mm,thestoredquantityisdeterminedclosetoafewhundredlitres.Eachdeviceisalsocapableofdetectingapossiblewaterinterfacebelowtheoillayer.Thisallowsforoptimisedfuelstockinventory.Inaddition,ourcustomersavesaconsiderableamountofmoneynotonlyinthebeginningbutalsointhelongrun:the2-wireOPTIFLEX1300CLevelMetersneedlesswiring,areeasytoinstallwithoutcommissioningandmaintenance-free.
5. Product used
OPTIFLEX 1300 C • Universallevelmeasurementdeviceforliquids,pastes,granulatesandpowders• Easyinstallation,commissioningandoperation• Maintenance-free• Specificfactorycalibrationforincreasedaccuracyandrepeatability• Suitableforflangetemperaturesupto300°Candpressuresupto300bar(processconditionscanevenbehigher)
• Measurementofinterfacesstartingat50mm
APPLICATION NOTE
Contact
KROHNES.A.S.LesOrs–BP9826103RomansCedexFranceTél.:+33475056703Fax:[email protected]
PleasevisitourwebsiteforacurrentlistofallKROHNEcontactsandaddresses.
Application 150 EN 2.indd 2 21.03.2011 11:51:04 Uhr