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2023/2/51NaturalGasHydrate
水合物荔灣平臺2023/2/52
Innaturalgaspipelineandequipment,theformationofhydratesmayresultinthereductionofpipelinesflowarea,orleadablocktoequipmentorpipeline.Therefore,itisveryimportantforustounderstandthecharacteristicsofhydrateinpreventingtheformationofgashydrate.Preface2023/2/53TABLEOFCONTENTS1.Thebasiccharacteristicsofgashydrate
2.Theformationofgashydrate3.Howtoinhibitorpreventhydrate4.Theapplicationofgashydrate2023/2/541.ThebasiccharacteristicsofgashydrateInacertaintemperatureandpressure,somecomponentsofthenaturalgaswithliquidwatercanformgashydrate.Gashydrateisakindofwhitecrystallinesolid,lookingsimilartotheiceordensityloosesnow,densityof0.88~0.9g/cm3.2023/2/55Naturalgashydrate2023/2/56Gashydratestructuresimilarcricketscage2023/2/571.1Thestructureofnaturalgashydrate
Gashydrateisakindofsquirrel-cageclathrate,eachwatermoleculeundertheactionofhydrogengridcombines
withtogether
toformacage,gasmoleculesbytheactionoftheVanderWaalsforcearesurroundedintheclathrate.2023/2/58Methanehydratesimulationdiagram2023/2/59TheinternalcagestructureFlammableice2023/2/510Gashydrate
水-水:氫鍵(hydrogenbond)Watermolecules“籠子(cavity)”Gasmolecules:CH4,C2H4,C2H6,C3H8,N2,H2S,CO2,Ne,Ar,Kr,Xe,
外觀為類冰晶體非化學計量的包合物(clathrate)2023/2/5111.2ThetypeofgashydrateTypesofclathrateNumberofwatermoleculesclathrate
shapeThenumberofclathratelholesclathratestructureoftheholeTypeI:46smallbig2651251262TypeII:136small
big16851251264TypeH:34smallMiddlebig321512435663512682023/2/5122023/2/5132.The
conditionsofGashydrateformation2.1Necessaryconditions:NaturalGasandfreewater.Therecognizedformationcondition:Temperaturecondition:2.5~25°C.Pressurecondition:5~40Mpa。2023/2/5142.2AuxiliaryconditionsAuxiliaryconditions:PressurefluctuationsHighspeedgasflowTheflowspeedfortheagitationTheexistenceofacrystalchipsAspecificphysicallocation(suchaselbow,orificeplate,valves,coarseofwall,etc.)2023/2/5152.3ThecriticaltemperatureofAllkindsofgashydrateformationNameC1C2C3I-C4N-C4CO2H2SGashydrateformationofcriticaltemperature/℃
21.511029Thecriticaltemperatureofgashydrateformationisthehighesttemperatureofpossiblehydrateexistence,overthistemperature,nomatterhowthepressureishigher,andnohydrateformation.Gashydrateformationofcriticaltemperatureasshownbelow.
2023/2/5162.4Predictionofhydrateformationpressureandtemperaturecurve2023/2/5172.5Theinfluenceofnaturalgashydrateformationbecauseofthegaseousimpurities
Therearehydrogensulphideandcarbondioxidecontaininginnaturalgas,intheconditionofconstantpressure,thehydrateformationtemperaturewillincrease;Undertheconditionofinvariableintemperaturewillreducethepressureofhydrateformation.Namely,naturalgascontainshydrogenandcarbondioxide,moreeasytogeneratehydrate.2023/2/518
Intheprocessofgasprocessing,whenthereismorecarbondioxideexistingingas,itwillappearinthefollowingtwoaspects:Atlowtemperatureandunderhighpressure,carbondioxideandwaterwillformthesolidhydrate,plugequipmentandpipe,Whengastemperaturelow(general<-57degreesCelsius),carbondioxide,alsocanformiceitself,andcanplugequipmentsandpipelines,especiallyintheinletofexpanderandthetopofcontacttower.RemovalofwatercanpreventCO2andH2Otoformatgashydrate,removecarbondioxidefrom
naturalgascanpreventgeneratingdryice.2.6TheinfluenceofCO2innaturalgas2023/2/5193.HydratepreventionBecausegashydrateisacrystallinesolidsubstances,oncegashydrateformation,itwillpluginthevalve,theinletofseparator,pipelines,elbow,teeetc.Italsoaffectgascollectionandtransportation,therefore,measuresmustbetakentopreventit.Usually,themethodofheatingor
Injectinginhibitorsisusedtopreventgashydrateformation
innaturalgasairtightgatheringandtransportationsystem.2023/2/5203.1Heatingmethod
Toincreasegastemperaturebeforethrottling,orlayingahotwaterpipelinewiththegaspipelineinparallelthatkeepthetemperatureofgasflowaboveitsdewpoint,sothisistheeffectivemethodtopreventgashydrateformation.2023/2/5213.2InjectinhibitorsInhibitorscanbeusedtopreventnaturalgashydrateformation,andtheyaredividedintoorganicinhibitorsandinhibitors.Organicinhibitorshavemethanolandglycolcompounds,andinorganicinhibitorshavecalciumandsodiumchloride,etc.Gasairtightgatheringandtransportationmainlyadoptsorganicinhibitors.Themostcommonlyusedinhibitorsaremethanolandglycol.2023/2/5223.3PerformancecomparisonofmethanolandglycolinhibitorsThelowcostofinvestmentismethanolinhibitorsbutlossalotingas,sothehighcostofoperation;Thehighcostofinvestmentisglycolinhibitors,butlowoperationcost;Thebesteffectinhibitorismethanol,secondlyisethyleneglycol,thirdlyisdiethyleneglycol;2023/2/5233.3PerformancecomparisonofmethanolandglycolinhibitorsInordertopreventmethanollosingingasphase,Itisnecessarytooperateinlowtemperature;Glycolinhibitorsissuitableforoperatinginhightemperature,lowtemperaturemay
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