application 248 en 2 -...

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