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1、NaturalGasDehydrationwithTEG1NaturalGasDehydrationwithTEG©2001HyprotechLtd.-AllRightsReserved.1.1.9NaturalGasDehydrationwithTEG_4.pdf12NaturalGasDehydrationwithTEGWorkshopAtthewellhead,reservoirfluidsgenerallyaresaturatedwithwater.Thewaterinthegascanpresentsomeproblems:•
2、formationofsolidhydratescanplugvalves,fittingsorpipes•thepresenceofwateralongwithH2SorCO2cancausecorrosionproblems•watercancondenseinthepipelinecausingerosionorcorrosionproblemsGenerally,adehydrationunitisusedingasplantstomeetapipelinespecification.Thereareseveraldiffere
3、ntprocessesavailablefordehydration:glycols,silicagel,ormolecularsieves.Thenaturalgasindustrycommonlyusestri-ethyleneglycol(TEG)forgasdehydrationwherelowgasdewpointtemperaturesarerequired,suchasinthedesignofoffshoreplatformsintheArcticorNorthSearegionsorforothercryogenicp
4、rocesses.Inthisexample,thewaterdewpointspecforthedrygasis-20°C(-4°F)at6200kPa(900psia).LearningObjectivesOnceyouhavecompletedthissection,youwillbeableto:•ModelatypicalTEGdehydrationunit•Determinewaterdewpointforagas.PrerequisitesBeforebeginningthissectionyouneedtobeablet
5、o:•Addstreams,operationsandcolumns.2ProcessOverview4NaturalGasDehydrationwithTEGColumnOverviewTEGContactorTEGRegenerator4NaturalGasDehydrationwithTEG5BuildingtheSimulationDefiningtheSimulationBasisForthiscase,youwillbeusingthePengRobinsonEOSwiththefollowingcomponents:N2,
6、H2S,CO2,C1,C2,C3,i-C4,n-C4,i-C5,n-C5,H2O,andTEG.StartingtheSimulationAddingthefeedstreams1.AddaMaterialstreamfortheinletgaswiththefollowingvalues:Inthiscell...Enter...NameInletGasTemperature30°C(85°F)Pressure6200kPa(900psia)MolarFlow500kgmole/h(10MMSCFD)ComponentMoleFrac
7、tionN20.0010H2S0.0155CO20.0284C10.8989C20.0310C30.0148i-C40.0059n-C40.0030i-C50.0010n-C50.0005H2O0.0000TEG0.000056NaturalGasDehydrationwithTEG2.AddasecondMaterialstreamfortheTEGfeedtotheTEGContactorwiththelistedvalues.Inthiscell...Enter...NameTEGFeedTemperature50°C(120°F
8、)Pressure6200kPa(900psia)LiqVolFlow0.5m3/h(2USGPM)ComponentMassFractionH2O0.01TEG0.99ThevaluesfortheStr
