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AGA8方程在天然气物性方面的应用
Introduction
Naturalgasisacomplexmixtureofgaseoushydrocarbonscomprisingmainlymethane(CH4),ethane(C2H6),propane(C3H8),butane(C4H10)andresidualotherhydrocarbonssuchaspentane(C5H12),hexane(C6H14),heptane(C7H16)andsoon.Becauseofitsimportanceasavaluableenergyresource,accuratedeterminationofitspropertiesisveryimportantforitstransportation,storage,andprocessing.TheAmericanGasAssociation(AGA)hasdevelopedstandardizedequationsthatarewidelyusedinthenaturalgasindustry.Amongthem,theAGA8equationofstateisthemostpopularequationusedtocalculatethethermodynamicpropertiesofnaturalgas.
AGA8Equation
AGA8Equationisasetofequationstocalculatethethermodynamicpropertiesofnaturalgasincondiitonsthatarenormalorabovethecriticaltemperatureandpressure.TheAGA8equationisbasedonthePeng-Robinsonequationofstatewhichhasbecomethestandardmodelforcalculatingthethermodynamicbehaviorofgases,liquidsandmixtures.
TheAGA8equationusestheinputparametersoftemperature,pressure,methane(CH4)molefraction,carbondioxide(CO2),andnitrogen(N2)molefractions.Theoutputsoftheequationincludethespecificgravity,heatingvalueperunitvolume,heatingvalueperunitmass,density,viscosity,compressibility,andotherproperties.TheAGA8equationisvalidfornaturalgaswithhydrocarboncomponentsrangingfromC1toC8andnitrogen(N2)orcarbondioxide(CO2)upto10percentbyvolume.
ApplicationinNaturalGasIndustry
TheAGA8equationiswidelyusedinthenaturalgasindustrytocalculatethepropertiesofnaturalgasunderdifferentconditions.Theequationplaysanimportantroleforthedesignandoperationofnaturalgaspipelines,compressorstations,andprocessingplants.SomeofthekeyapplicationsoftheAGA8equationinclude:
1.PipelineDesign:TheAGA8equationisusedtoestimatethepressurelossesandtemperaturechangesinnaturalgaspipelines.Theequationisparticularlyimportantforpredictingthenaturalgasflowratesunderdifferenttemperatureandpressureconditions.
2.GasProcessing:TheAGA8equationisusedtooptimizethegasprocessingplantsbycalculatingthecompositionofthenaturalgas.Thisisimportantasnaturalgasesfromdif