燃气轮机及其辅助系统介绍知识讲解.ppt

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1、燃气轮机及其辅助系统介绍PhysicsPrincipleofConservationofMass:massin=massout(OpenSystem)PrincipleofConservationofEnergy:energyin=energyoutenergymaybetransformedfromoneformtoanother(PowerPlantconvertsChemicaltoThermaltoMechanicaltoElectricalEnergy)2FirstLawofThermodynamicsQ=727MWW=281MWExample:9FBEn

2、ergyBalanceDH4-1=446MWWhere:DH=totalenthalpychangefluidenteringsystemQ=netthermalenergyflowingintosystemduringprocessW=networkdonebythesystemGeneralEnergyEquationenergyin=energyout,orQ=W+DH3SecondLawofThermodynamics-AmountofenergywhichisunavailabletodoworkAmeasureofdisorderEntropy:Basi

3、cPrinciple:Heatmovesfromhottocold4Note:sdenotesentropyIdealBraytonCycleGasTurbineApplication)T(T)T(T)T(THeatContent(Fuel)WorkOutput(MW)231243Cycle----==h5RealBraytonCycleCompressionandTurbineExpansionInefficienciesTypicalValuesforGETurbinesCompressorEfficiency0.86-0.89TurbineEfficiency

4、0.90-0.93EntropyTemperaturePeakCyclePressureMinimumCyclePressureCompressionTurbineExpansionConstantPressureHeatAdditionConstantPressureHeatRejectionIdealCycleWithhc&htLEGEND12346RealBraytonCyclePressureLosses-Inlet,Combustor,ExhaustTypicalValuesforTurbineInletPressureLoss3”H2OExhaustBa

5、ckPressure(SC)5.5”H2OExhaustBackPressure(CC)15”H2ODLNCombustor6-7%DP/PInletExhaustCombustor23147RealBraytonCycleParasiticFlowsforTurbineCoolingEntropyTemperatureCompressorDischargePressureAmbientPressureCompressionExpansionHeatAdditionHeatRejectionCombustorDPExhaustDPInletDPStg1Cooling

6、Stg2CoolingStg3CoolingIdealCycleWithhc&htWithDP’sWithCoolingFlowsLEGENDStg1NozzleCooling41238COMPRESSORQADDEDExchangerHeatBurnPH=ConstantQin33EntropySuckSqueezeCompression1212TemperatureExpansionCOMPRESSORShaftWorkTURBINEQREJECTEDBlowTurnPL=ConstantQout44TURBINETheTURBINEtransformsther

7、malenergyintomechanicalenergy(3–4)usedfordrivingtheCompressor&GeneratorBraytonCycle–GasTurbine9Worldwideheavy-dutyGasTurbinemanufacturers103.2OutputYear20001980197019601990100MW200MW93000RPM73600RPM5-65100-5230RPM5P7A7E9B6A7F9F9FB7FB6FA9E6B7EA5L3-66900-7100RPM6CAero(CF6)EvolutionofGE