聚乙烯工艺描述英文文档格式.docx
《聚乙烯工艺描述英文文档格式.docx》由会员分享,可在线阅读,更多相关《聚乙烯工艺描述英文文档格式.docx(31页珍藏版)》请在冰豆网上搜索。
1.2.3DescriptionofAuxiliaryFacilities
工艺描述
1.1装置组成
1.1.1PE工艺单元
1.1.2配套设施
1.1.3辅助设施
1.2工艺介绍
1.2.1PE工艺单元描述
1.2.2配套设施描述
1.2.3辅助设施描述
TheContractPlantproduces300,000TPYofpelletedLinearLow,Medium,andHighDensityPolyethylenefromethylene,whichmayinvolvetheadditionofaonomer(butene-1orhexene-1)forsomeProducts.TheContractPlantBatteryLimitsisrepresentedinthediagramprovidedinAttachment11ofthisAppendix.TheContractPlantconsistsofthefollowingsystems.
1.1合同装置组成
本合同装置是用乙烯为单体,可能会引入丁烯-1或己烯-1为共聚单体来生产高、低、中密度聚乙烯树脂的装置,产能为30万吨/年。
合同装置界区X围见本附件的附录1-1。
本合同装置由下列系统组成:
ThePEProcessUnitutilizesUnivationTechnologies’UNIPOL™PEProcess,alowpressuregasphasepolymerizationprocess,andincludesthefollowingprocesssystems:
∙RawMaterialSupplyandPurification
∙EthylenePurification
∙Reaction(includescatalysthandlingandfeeding)
∙ResinDegassing
∙VentRecovery
∙SeedBedSystem
∙ResinAdditiveHandling
∙Pelleting
1.1.1PE工艺单元
PE工艺单元采用Univation技术公司的UNIPOL聚乙烯技术,这是一种低压气相聚合工艺,包括下列工艺系统:
--原料供给和精制
--乙烯精制
--反应(包括催化剂处理和进料)
--树脂脱气
--排放气回收
--种子床系统
--树脂添加剂处理
--造粒
TheSupportingFacilitiesforthePEProcessUnitincludethefollowingprocesssystems:
∙ResinHandlingSystem
1.1.2配套设施
PE工艺单元的配套设施包括下列系统:
--树脂处理系统
TheAuxiliaryFacilitiesforthePEProcessUnitincludethefollowingprocesssystems:
∙SteamandCondensateRecoverySystem
∙FlareSystems
∙WasteWaterCollectionandPretreatmentSystem
∙UtilityDistributionSystem
1.1.3辅助设施
PE工艺单元的工艺辅助设施包括下列系统:
--蒸汽和冷凝水回收系统
--火炬系统
--废水收集和预处理系统
--公用工程配送系统
ThedesignofthePEProcessUnitwillincorporatethelatestUNIPOLPEProcessKnow-how.1.2工艺介绍
XX焦化聚乙烯装置的设计将采用最新的UNIPOLPE工艺技术。
1.2.1DescriptionofthePEProcessUnit
ThePEProcessUnitprisesanumberofprocesssystems,whicharedescribedindetailinthefollowingsections:
∙RawMaterialSupplyandPurification(Part1)
∙EthylenePurification(Part2)
∙Reaction(Part4)
∙ResinDegassing(Part5A)
∙VentRecovery(Part5B)
∙SeedBedSystem(Part5E)
∙ResinAdditiveHandling(Part6)
∙Pelleting(Part7)
ProcessFlowDiagrams(PFDs)thatrepresenttheseprocesssystemsareprovidedinAttachment12ofthisappendix.
AlloftheequipmentdescribedinthefollowingprocessdescriptionisincludedinthepreliminaryequipmentlistprovidedinAppendix5.
1.2.1PE工艺单元描述
PE工艺单元由一系列工艺系统组成,下面对这些系统进行详细描述:
原料的供应和精制(第1部分)
乙烯的精制(第2部分)
反应(第4部分)
树脂脱气(第5A部分)
排放气回收(第5B部分)
种子床系统(第5E部分)
树脂添加剂处理(第6部分)
造粒(第7部分)
工艺流程图(PFD)附于本附件的附录1-2。
下面工艺描述中涉及的所有设备见附件5中的初步工艺设备清单。
RawMaterialSupplyandPurification(Part1)
NitrogenandhydrogenaredeliveredtotheContractPlantBatteryLimitsbypipeline.
onomers,butene1andhexene1,andInducedCondensingAgent(ICA),isopentane,aresuppliedtotheContractPlantbypipeline.IthasbeenassumedthatsufficientstoragecapacityisavailablefromtheOutsideBatteryLimits(OSBL)forbutene1,hexene1,andICA.
CocatalystalkylisreceivedinshippingcontainersforusedirectlyinthePEProcessUnit.
onomerPurification
Amonpurificationsystemisprovidedforthetwoonomers-butene1andhexene1.LiquidonomerfromtheBatteryLimitsisfeddirectlyintotheonomerDegassingColumn(C1008).Thecolumn,whichismountedontheonomerSurgeTank(C1007),isequippedwithwatercooledonomerCondenser(E1009)andsteamheatedonomerReboiler(E1010).Asmallstreamofoverheadgas,containingstrippedlightgascontaminantsventstotheflare.ThebottomproductfromtheonomerSurgeTankpassesthroughonomerCooler(E1011).Thecooler’sprimarypurposeistoprovideadequateNPSHfortheonomerChargePump(G1002orG1003,aninstalledspare).TheonomerChargePumpbooststheonomerpressuretoapproximately2,861kPag(415psig)forflowintotheReactor.FromtheonomerChargePump,onomerflowsthroughtheonomerDryer(C1004orC1005)toremovewaterandotherpolarimpuritiesfromtheonomerstreambyphysicaladsorption.Themolecularsievebedsrequireperiodicregenerationwithhotnitrogen.ThespareonomerDryerisusedwhiletheotherisbeingregenerated,thusallowinguninterruptedonomerflow.
NitrogenPurification
NitrogenfromtheBatteryLimitspassesthroughtheNitrogenPreheater(E1108)beforeenteringtheNitrogenDeoxoVessel(C1109orC1111).TheNitrogenDeoxoVesselcontainsafixedbedoffreecoppercatalystwhichremovesoxygenfromthenitrogenstreambyoxidationofcoppertocopperoxides.Thecatalystbedrequiresperiodicregenerationwithastreamofhydrogendilutedinhotnitrogen.NitrogenleavingtheNitrogenDeoxoVesselisfedtotheNitrogenDryer(C1112).TheNitrogenDryercontainsmolecularsieveswhichremovewaterandotherpolarimpuritiesfromthenitrogenstreambyphysicaladsorption.Themolecularsievebedrequiresperiodicregenerationwithhotnitrogen.ThespareNitrogenDryerisusedwhiletheotherisbeingregenerated,thusallowinguninterruptednitrogenflow.
HighpressurepurifiednitrogenisutilizedintheReactionSystem,whilelowpressurepurifiednitrogenissuppliedtovariousplacesthroughoutthePEProcessUnit.PurifiednitrogentobepressedforuseintheReactionSystemistakenfromtheoutletoftheNitrogenDryer.ThepressureisboostedbyNitrogenpressorPackage(K1102)toapressureofabout3,309kPag(480psig).ThehighpressurepurifiednitrogenthenpassesthroughPurifiedNitrogenFilter(Y1114)andflowsontotheReactionSystem.
HydrogenPurification
HydrogensupplyfromtheBatteryLimitsispreheatedintheMethanatorHeater(E1204)beforeenteringtheMethanator(C1205).TheMethanatorcontainsafixedbedofcatalystwhichconvertscarbonmonoxideandcarbondioxideinthepresenceofhydrogentoformmethaneandwater.HydrogenleavingtheMethanatoriscooledintheMethanatorAftercooler(E1206)toapproximately40degCandisfedtotheHydrogenDryer(C1207).TheHydrogenDryercontainsmolecularsieveswhichremovewaterfromthehydrogenstreambyphysicaladsorption.Themolecularsievebedrequiresperiodicregenerationwithhotnitrogen.TheHydrogenDryerisbypassedwhilebeingregenerated,thusallowinguninterruptedhydrogenflow.
HydrogenfromtheHydrogenDryerisfedtotheReactionSystemortothedeoxovesselswithinthePurificationSystem.
ICAPurification
TheUNIPOLPEProcessusesisopentaneasanInducedCondensingAgent(ICA)withintheReactionSystemtoenhanceheatremoval.IsopentanefromtheBatteryLimitsisfeddirectlytotheICADegassingColumn(C1421).Thecolumn,whichismountedontheICASurgeTank(C1406),isequippedwithwatercooledICACondenser(E1422)andsteamheatedICAReboiler(E1415).Asmallstreamofoverheadgas,containingstrippedlightgascontaminantsisventedtoflare.ThebottomproductfromtheICASurgeTankpassesthroughtheICACooler(E1423).TheprimarypurposeofthecooleristoprovideadequateNPSHfortheICAChargePump(G1412orG1413,aninstalledspare).TheICAChargePumpboostsICApressuretoapproximately3,137kPag(455psig)forflowintotheReactor.FromtheICAChargePump,theICAflowsthroughtheICADryer(C1419orC1420)toremovewaterandotherpolarimpuritiesfromtheICAstreambyphysicaladsorption.Themolecularsievebedsrequireperiodicregenerationwithhotnitrogen.ThespareICADryerisusedwhiletheotherisbeingregenerated,thusallowingICAflowtocontinuethroughtheICAPurificationSystem.
Alkyl
AdditiveT2,analkyl,isusedinZiegler-Nattacatalyzedpolymerizationandisconsideredtobeahazardousmaterialinsomelocationsbecauseofitsreactivenature.PurifiednitrogenisusedtopressurethealkylfromtheshippingcontainertotheT2FeedPot(C1505)andthentotheT2ChargePump(G1503orG1504,aninstalledspare).Thesepumpspressurethealkyltoapproximately3,137kPag(455psig)forfeedtotheReactionSystem.
AllventsfromtheAdditiveT2SystemareroutedtotheSealPot(C1502)andbinedwithmineraloiltoproducealessreactivesolution.Periodically,theSealPotcontentsaredrainedtoadisposaltankfordisposalbyanoffsitedisposalcontractor.
MineraloilispumpedfromsupplydrumsbyMineralOilDrumPump(G1514)totheSealPotfordilutionofalkyl.Alternately,theMineralOilDrumPumpmaybeusedtotransfermineraloilfromthesupplydrumstotheMineralOilBlowTank(C1512).MineraloilfromtheMineralOilBlowTankisusedforflushingtheAdditiveT2Systemformaintenance.
原料的供应及精制(第1部分)
氮气和氢气由管道输送至装置界区内。
共聚单体(丁烯-1、己烯-1)及诱导冷凝剂(ICA)(异戊烷)由界区内的配套设施提供。
假定装置界区外有足够的丁烯、己烯及诱导冷凝剂(ICA)储存。
助催化剂烷基铝用钢瓶直接运至PE工艺单元。
共聚单体的精制
两种共聚单体——丁烯-1和己烯-1共用一个精制系统。
来自界区的液相共聚单体直接送入共聚单体脱气塔(C-1008)。
脱气塔位于共聚单体缓冲罐(C-1007)之上,塔顶有一个水冷的共聚单体冷凝器(E-1009)使共聚单体冷凝,塔底有一个蒸汽加热的共聚单体再沸器(E-1010)使共聚单体汽化。
塔顶脱除的少量的轻组分塔顶气被排放到火炬。
共聚单体缓冲罐的底部产品由共聚单体冷却器(E-1011)冷却。
冷却器的主要目的是为共聚单体进料泵(G-1002或G-1003,其中一个是在线备用泵)提供足够的有效气蚀余量。
共聚单体进料泵使共聚单体增压至大约2861kPag(415psig)后进入反应器。
来自共聚单体进料泵的共聚单体进入共聚单体干燥器(C-1004或C-1005),通过物理吸收作用除去共聚单体物流中的水分和其它极性杂质。
分子筛床层需要用热氮气定期再生。
当一个共聚单体干燥器进行再生时,就启用备用的共聚单体干燥器,这样可使共聚单体不间断地流入反应系统。
氮气的精制
从界区来的氮气在进入氮气脱氧罐(C-1109或C-1111)之前在氮气预热器(E-1108)中进行预热。
氮气脱氧罐含有一个游离铜催化剂的固定床,通过将游离铜氧化成氧化铜而除去氮气中的氧气。
催化剂床需要用含有少量氢气的热氮气进行定期再生。
离开氮气脱氧罐的氮气进入氮气干燥器(C-1112)。
氮气干燥器内设有分子筛,通过物理吸收作用除去氮气中的水分和其它极性杂质。
分子筛需要用热氮气定期再生。
一台氮气干燥器再生时,另外一台备用干燥器启动运行,以保证氮气持续地流入反应系统。
高压精制的氮气用于反应系统,而低压