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ID:36354441
大小:9.16 MB
页数:64页
时间:2019-05-10
《发酵搅拌罐流场分析与结构优化》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、江南大学硕士学位论文发酵搅拌罐流场分析与结构优化姓名:黄男男申请学位级别:硕士专业:机械设计及理论指导教师:张秋菊20090601AbstractThispaperisapartoftheresearchproject:ExtractionofHighConcentrationFermentationLiquidandCleanProductionTechnologiesofGlutamate,supportedbyState863Project(No.2006AA020303-02).Theflowfielddistributionandpowerconsump
2、tionaretwoimportantparametersforinvestigatingtheperformanceofstirredtank.Basedontheprototypeofallactualfermentationstirredtank,thisPaDercarriedouttheflowfieldanalysisandstructuraloptimizationbyusingnumericalsimulations.Themainresearchesandconclusionsaleasfollows:(1)Accordingtotheanaly
3、sisandcomparebetweenthestirredtankwithandwithoutdraR.tubethroughthesimulationofflowfield.findthatunderthecooperationofimpellersanddraft.tube.theflowintheaxialdirectionhasbeenreinforced,andthemixtureeffectoffluidsarrangingintheupperlayerandlowerlayerrespectivelyhasbeenimprovedevidently
4、.Atthesametime.theliquidneartheimpellernolongerrotatealongwiththeimpeller.Asaresult.thepowerconsumptionofmixturehasbeendeclinedby12%comparedwiththesituationwithoutadraft.tube.andtheflowfieldinthetankhasbecomeanidealone.(2)Aftertheanalysisofmanygroupsofstructuresbychoosingstructurepara
5、meters,therearesomesatisfiedcombinationsamongthem.Intheseconditions,theflowfieldinthetankhasbeenaidealonethatflowsinainerraticway.(3)Theresearchesabouttheinfluenceofimpellerrotatingindifferentspeedandthedifferenceinpowerconsumptionhavebeenconducted.Accordingtoourconclusion,theincrease
6、oftherotatespeedofimpellerinclinetolittlechangeintheflowingpatternofthefluidsinthetank.However,thepowerconsumptionwilltripleifdoublingtherotatingspeedofimpeller.(4)Comparedwithsingle-paddlestirredtank,thepowerconsumptionofdual—paddlestirredtankincreasesasmushas170%,butabetterflowfield
7、distributioncomesout,withlargereffe:ctivemixedarea.Inaddition,AfterresearchingthedifferenceoftheflowfiledowingtOdifferentdistancebetweentwopaddlesofthedual—paddlestirredtank,theresultsshowthat:anappropriateincreaseinthedistanceisconducivetoimprovethemixingeffectandlowerpowerconsumptio
8、n.And
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