冰颗粒粒径对冰点以下甲烷水合物自保护效应的影响

:2008203205;:20082072201:(:4047006);(:J0630966).E2mail:[e-mail].,,(,730000):,62,,,,,,;:;;;:TE122:A:167221926(2008)0420577204,[1]Yakushev[2],,,,II[325]Gudmundsson[6],-18-10-5,710dStern[7],,242271K,;193240K272290K2,Stern[7]242271K,Stern[7]180250m,Shirota[8],268K,Shirota[8],,[1],,,,,[9],,11.114.3cm19420088NATURALGASGEOSCIENCEVol.19No.4Aug.2008,450mL1,,,010MPa,,0.1MPa(Julabo),,-100250,0.1,0.05DT500,11.21.2.1,2:;,,[10],,,75m100m250m500m750m1000m6,,,,,,0,,,1.2.2[7],99.99%,,[728]:,2,,,,,,610MPa-3,1h,2K/h0.190120h,1.2.3[7],4K/h,,,0.5MPa,0.1MPa,,,,,,,7h,3,22.122,2875Vol.19,1000m,5.6%,75m(1),,1(m)(K)(mL)(mL)(%)375271.23215486066.15250271.61800625028.80500271.8830600013.831000271.016529455.603/2.23,3,,,75m4mL/s,1000m0.4mL/s,10,,,32.344,SternShirota269K271K,,Shirota[8]Stern[7],Shirota[8]24h668h455,2,,,,75m,2.4310-5%/s,12h1000m,1.7710-6%/s,8d5,975No.4:,,,,,Shirota[8],,3(1),,(2),,75m1000m10(3),,:[1]SloanED.ClathrateHydrateofNaturalGases[M].2nded.NewYork:MarcelDekkerInc,1998.[2]YakushevVS,IstominVA.Gas2hydrateself2preservationeffect[M]//MaenoN,HondohT.PhysicsandChemistryofIce.Sapporo:HokkaidoUniversityPress,1992:1362139.[3]HandaY,StupinD.Thermodynamicpropertiesanddissocia2tioncharacteristicsofmethaneandpropanehydratesin702ÜA2radiussilicagelporest[J].PhyicalChemistry,1992,96:859928603.[4]DavidsonD,GargS,GoughS,HandaY,etal.LaboratoryanalysisofanaturallyoccurringgashydratefromsedimentoftheGulfofMexico[J].GeochimCosmochimActa,1986,50:6192623.[5]HandaYP.Compositions,enthalpiesofdissociation,andheatcapacitiesintherange85to270Kforclathratehydratesofmethane,ethane,andpropane,andenthalpyofdissocia2tionofisobutanehydrate,asdeterminedbyaheat2flowcalo2rimeter[J].ChemicalThermodynamics,1986,18:9152921.[6]GudmundssonJS,ParlaktunaM,LevikOI,etal.LaboratoryforContinuousProductionofNaturalGasHydrates[C].AnnalsoftheNewYorkAcademyofSciences,2000:912,851.[7]SternLA,CirconeS,KirbySH,etal.Anomalouspreser2vationofpuremethanehydrateat1atm[J].JournalofPhys2icalChemistryB,2001,105,175621762.[8]ShirotaH,AyaI,NamieS,etal.Measurementofmethanehydratedissociationforapplicationtonaturalgasstorageandtransportation[C]//ProceedingsoftheFourthInternationalConferenceonGasHydrates,Yokohama,Japan,2002:9722977.[9],.[J].,2004,4(1):69274.[10]PetersDJ.AStudyofHydrateDissociationinPipelinesbytheMethodofTwo2SidedDepressurization:EperimentandModel[D].MasterofScienceThesis,ColoradoSchoolofMines.1999.EffectofParticleSizeofIceonMethaneHydrateSelf2PreservationbelowFreezingPointZHANJing,WUQing2bai,JIANGGuan2li(StateKeyLaboratoryofFrozenSoilEngineering,ColdandAridRegionsEnvironmentalandEngineeringResearchInstitute,ChineseAcademyofSciences,Lanzhou730000China)Abstract:Tostudytheimpactsoftheiceparticlesizeontheself2preservationofmethanehydrate,thedis2sociationexperimentofmethanehydrateswerecarriedout.Itcontainssixdifferentsizesoficeparticlesun2dertwodifferenttemperatures,aimingatanalyzingtheimpactsofthetotalreleasevolumeofmethaneandthedissociationrateontheself2preservationtime.Theresultsshowthatthesizeoftheiceparticlehadevi2dentimpactsonthedissociationofmethanehydrates.Thetotalreleasevolumeofmethaneandthedissoci2ationratewereinverselyproportionaltotheiceparticlesize,thesmallertheiceparticlesize,thefasterthedissociationrate.Thisfeaturewasveryremarkableatthebeginningofthedissociation.And,themethanehydrateformedbythebiggersizeoficeparticlehadmoreeffectiveself2preservation.Keywords:Methanehydrate;Self2preservation;Dissociation;Particlesize.085Vol.19