Measuring Heavy Fuel Oil consumption at a power station
•Replacementofhigh-maintenanceturbinemeters•Measuringthefeedlineandreturnlineallowsforevaluationofefficiency•Leakcheckinginthesystem
1. Background ApowergenerationcompanyintheUKoperatesacoal-firedpowerstation.Althoughthefourboilersatthestationrunpredominantlyoncoal,HeavyFuelOil(HFO)isusedduringthestartupphasetogettheboilerstooptimumoperatingtemperature,orforshort-durationoperationoftheboilersduringpeakdemand.
2. Measurement requirements
FormeasuringtheconsumptionofHFOoneachboiler,thecompanyhadturbinemetersinstalled.Tomaintainaccuracy,thesemetersneededtobeservicedregularlyduetodepositsanddirtontheturbineblades,causingsignificantmaintenancecosts.Therefore,thecompanywaslookingforanalternativeflowmeasurementsolutiontobeoperatedatmuchlowercost.
Application Data:Medium: HeavyFuelOil Flowrate: 10…80kg/secTemperature: 100…140°C Density: 900…930kg/m3 Viscosity: 450…600cSt
3. KROHNE Solution
KROHNEdelivered8Coriolis-MassflowmetersOPTIMASS7300FT80.NominalsizeofthesemetersisDN80/30"withasinglestraightmeasuringtubemadeoftitanium.Replacingtheturbinemeters,thecoriolismeterswereinstalledinpairsoneachboiler,onemeasuringtheflowtotheboilerandtheothermeasuringthereturnflowofunusedoil.
APPLICATION NOTE Power Industry
Application 248 EN 2.indd 1 15.09.2010 9:13:39 Uhr
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4. Customer advantages
TheaccuratemeasurementallowstheoperatorstomonitortheusageofHFOcloselyandpreciselyandtoevaluatetheefficiencyoftheplant.WhentheHFOisnotbeingburnt,itiscontinuouslyrecirculated.Beinginstalledinpairs,themeterscanbeusedasacross-checktoeachotherandalsotocheckforleaksinthesystem.
OPTIMASScoriolismetersdirectlymeasuremassflowrateoftheHFO.Thetitaniumversionwaschosenduetoitshighaccuracyandtemperaturerange.AstandardfeatureofOPTIMASS7000isthatthemetersarecalibratedat3differenttemperaturestocompensateinfluencesoftemperaturechangesonthemeasurement.Acertifiedsecondarycontainment(pressurerating100bar/1450PSI)ensuressafetyofthedevicesastheyareinstalledinahighpressureline.
Astheyhavenomovingpartstobeservicedoradjusted,theOPTIMASSmetersreducemaintenanceefforttozero.Beingastraighttubewithnoinserts,pressuredropisverylowcomparedtotheturbinemetersandthuspumpcapacitycanbereduced,thussavingcosts.
Duetothelocationofthesensorsandforaconvenientread-outon-site,convertersweremountedseparately.Customeralsomadeuseofthefree3yearextendedwarrantywhichensurestotalsupportfromKROHNE.ThiswasadecisivefactortouseOPTIMASSasthemanufacturercouldensurelong-termreliabilityofthedevices.
5. Products used
OPTIMASS 7300• Singlestraighttubemeterwithlowpressuredrop• Highsafetywithstandardpressurerating100bar/1450PSIandPEDapprovedsecondarycontainment
• Noinstallationrestrictions;straightupstreamanddownstreamsectionsarenotrequired
• Allcommonapprovalsavailable• Remoteelectronicssuitableforinstallationupto300mfromthesensor
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APPLICATION NOTE
Converters mounted separately
Application 248 EN 2.indd 2 15.09.2010 9:13:42 Uhr
