节流阀内天然气组分凝结规律研究

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1、学兔兔www.xuetutu.com第48卷第1O期机械、工程学报Vl01．48NO．1O2012年5月JOURNAL0FMECHANICALENGINEERINGMay2012DoI：10．3901／JME．2012．10．139节流阀内天然气组分凝结规律研究木柳海吕孝飞2张锋李名生白博峰2f1．中国石油新疆油田分公司采气一厂克拉玛依834007：2．西安交通大学动力工程多相流国家重点实验室西安710049)摘要：节流制冷低温分离工艺是天然气集输过程中常见的脱水脱烃技术，节流凝结过程是天然气露点温度能否达标、

2、工艺系统能否优化运行的关键。基于天然气在节流阀内的凝结过程，建立均质凝结和异质凝结统一的数值模型，研究天然气中易发生凝结的四种烷烃(正戊烷、正己烷、正庚烷、正辛烷)组分的凝结规律，分析背压比和总温等因素对凝结性质的影响。结果表明：节流阀内部流场非常复杂，呈现强湍流特性，节流孔内达到极低的温度使烃类组分的凝结在节流孔出口前基本完成。背压比和总温增加会减弱节流温降，使各组分的凝结量和液滴尺寸同时减小。节流过程中各组分的凝结性质存在较大差异。分子量较小的轻烃类组分，节流孔出口凝结量大，且凝结量和液滴尺寸受背压比和总温

3、的影响大。关键词：天然气节流凝结中图分类号：TK121ComponentCondensationofNaturalGasinThrottlingFlowLIUHaiLOXiaofei2ZHANGFengLIMingshengBAIBofeng2(1．FristGasProductionFactory,PetroChinaXinjiangOilFieldBranchCompany,Karamay834007；2．StateKeyLaboratoryofMultiphaseFlowinPowerEngineerin

4、g，Xi’ai1JiaotongUniversity,Xi’all710049)Abstract：Innaturalgasgatheringandtransportationprocess，thethrottlingexpansionrefrigerationandlowtemperatureseparationmethodisoneofthemostcommontechnology．Thecondensationisakeyissueduringthethrottlingflow,asthetemperatu

5、reafterthrotleisthemaininfluencefactorsofdewpoint．Withthefielddataofthrotlingseparationtechnology,uniformmodelforhomogeneousandheterogeneouscondensationisestablishedtostudythenaturalgasthrotlingcondensationprocess．Fourhydrocarboncomponents(n-pentane，n-hexane

6、，n—heptane，n-butane)arechosenastheobjectsofstudy．Theefectsofbackpressureratioandinlettotaltemperatureonthecondensationpropertiesofdiferenthydrocarboncomponentsareanalyzed．Itisshownthat，theflowfieldinthethrotleisextremelycomplex，andintenseturbulentflowcharact

7、eristicsarepresented．Inthenaturalgasthrotlingprocess，extremelylowtemperatureisobtainedwhichprovidesthesuitableconditionforcondensationofthehydrocarbons．Withincreaseofbackpressureratioandtotaltemperature，thecondensationmassfractionanddropletsizeofeachcondensa

8、blecomponentdecrease．Greatdiferencesofcondensationparametersarefoundamongeachcomponent．Forthelighterhydrocarboncomponents．thecondensationmassfractionisgreater,andthecondensationmassfractionanddr