船舶主机与能效的关系 (1)讲解.pptx

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IMOModelCourse4.05EnergyEfficientOperationofShipsLecture4-2:EnginesHullandpropulsionsystemHangzhou,China8to9December2016AstridDispertGloMEEPTechnicalAdviserMarineEnvironmentDivision

LearningobjectivesInthislecture,youareexpectedtolearnandbecomeawareofthefollowingtopics:Overviewofaship’spropulsionandenginesTypesofengineson-boardEnginesperformancecharacteristicsandtheiranalysisTypicalengines’EnergyEfficiencyMeasures(EEMs)Engines’performanceandconditionmonitoring

Shippropulsionsystem(directdrive)DirectDrive:Engineandpropellerarelinkedtogetherviapropulsionshaft.Slowspeedenginesandlargepropellerareused.Source:KYMAsite

Propulsionsystem(mediumspeed,gear-drive)Geardrive:Engineandpropellerarelinkedtogetherviaagearbox.Engineisnormallyamedium-speedengine.

Propulsionsystem(electricdrive)ElectricpropulsionElectricityisgenerationcentrallyforbothpropulsionandauxiliaryservicesPropellerisdrivenusingelectricmotors.ShipservicesSource:ThyssenKruppMarine

EnginesforshipsDieselenginesMorethan99%ofcommercialshipsusedieselengines.GasturbinesPrimarilyincruiseshipsandnavalapplications.SteamturbineThingsofthepast.CurrentuseislimitedtoolderLNGCarriers.MANslowspeeddieselengine

Engineroom-Tanker(typical)OnemainengineSlowspeeddieselengineThreeauxiliaryenginesMediumspeeddieselenginesOtherengineson-boardEmergencydieselgeneratorHighspeeddieselengine

DieselenginefuelefficiencyindicatorSFOC(SpecificFuelOilConsumption)istheindicatorforanengine’sfuelefficiency.Itsunitisg/kWhthatmeansgramfuelusedinordertoproduceonekWhofshaftenergy.SFOCvariesfromenginetoengine.LowerspeedenginesnormallyhavelowerSFOC(higherefficiency).SFOCisnormallymeasuredandrecordedintheengine’sNOxTechnicalFile.MediumspeedenginesHighspeedenginesSlowspeedenginesDieselSFOC(BSFC)

Exercise–Calculation

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