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ID:52355013
大小:1.56 MB
页数:7页
时间:2020-03-26
《大型LNG储罐储液翻滚特性的多阶段研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、_研究探讨石油工程建设大型LNG储罐储液翻滚特性的多阶段研究王萍,彭文山,曹学文,王庆,靳学堂1.胜利油田森诺胜利工程有限公司,山东东营2570002.中国石油大学(华东)储运与建筑工程学院,山东青岛266580doi:10.39694.issn.1001-2206.2016.01.004摘要:一般认为相邻两层LNG间密度差大于O.5kg/m。、温度差大于0.2℃就会引起LNG翻滚,导致大量LNG快速蒸发,罐内压力急剧升高影响存储安全,不仅浪费资源且造成极大安全隐患。在罐内LNG液体已经形成分层且可引发翻滚的基础上,利用Fluent软件建立罐内LNG翻滚过程中气相空间数值计算模型。得出主要
2、结论如下:(1)储罐内LNG分层后翻滚过程可以分为四个过程:界面扰动阶段、扰动发展阶段、剧烈翻滚增压阶段和平稳恢复阶段;(2)储罐内LNG发生翻滚时,罐内LNG迅速蒸发,罐内压力急剧上升至储罐最大工作压力时,安全泄放阀打开泄放气体以防止罐内超压;(3)研究表明16万m。储罐充满率为70%、上层重质LNG厚度为1m、LNG分层间密度差为1kg/m。时,翻滚发生时的平均蒸发速率是静态蒸发速率的32.3倍,安全泄放阀在翻滚发生约16h后打开泄压。关键词:LNG储罐;分层与翻滚;翻滚特性;速度;压力Multi-stageStudyonRollingCharacteristicsofLiquidin
3、LargeLNGStorageTankWANGPing’,PENGWenshan,CAOXuewen,WANGQing,JINXuetang1.ShengliOilfieldSennuoShengliEngineeringCo.,Ltd.,Dongying257100,China2CollegeofPipelineandCivilEngineering,ChinaUniversityofPetroleum,Qingdao266580,ChinaAbstract:lt’SgeneraIlYbelievedthattherolingofliquidinLNGstoragetankhappens
4、asthedensitydifferenceoftwoadja—centlayersofLNGgetsgreaterthan0.5kg/m0andthetemperaturedifferencegetsgreaterthan0.2oC.LargeamountsofLNGevaporatequickly.whichraisesthepressureinthetankandsho~ensthesecurestoragetime.evenmayIeadtostratificationandrollingcausingmassiveevaporationofLNG.ThisphenomenoniS
5、notonlyawasteofresourcesbutalsoapotentialsafetyhazardOnthebasisofconditionthatLNGliquidinthetankhasalreadybecomeIayeredandhasthepossi—bilityforrolling,thispaperusesFluentsoftwaretoestablishnumericalmodelforgasphasespaceintherollingprocessofLNGinthetank.ThemainresultsareasfollOWS:(1)Followingthestr
6、atification,theprocessofrollingcanbedividedintofourperiods:occurrenceofinterfaciaIdisturbance.developmentofdisturbance.violentrollingwithincreasingpres-sureandsmoothrecovery(2)TherollinginsidethetankmakesLNGevaporateatahighspeedwhichsharplyincreasesthepressureinthetank.Whenthepressurereachesthemax
7、imumworkingpressureoftank.thereliefvalvewouldopentoreleasetheexcessivegasincaseofoverpressure.(3)FortheconditionsthatthevolumeoftankiS16O000m0,thefillingrateis70%,thicknessoftopheavyLNGis1mandthedensitydifference
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