试析微孔塔板流体力学和传质性能的研究

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1、天津大学硕士学位论文微孔塔板流体力学和传质性能的研究姓名：肖坤林申请学位级别：硕士专业：化学工程指导教师：李鑫钢2002.1.1中文摘要板式塔是一种重要的炼油、化工气液传质设备，在与填料塔的新一轮竞争中显示出强劲的发展势头。本文在此背景下开发出三种新型小孔塔板传质元件一丝网罩，小孔罩和铜砂微孔罩，分别设计成不同的形状和高度，在一个500X500mm2有机玻璃方塔内用空气一水系统测定了其流体力学性能指标一塔板压降、漏液和清液层高度，研究了它们随孔／空塔动能因子、堰高和液流强度变化的规律，并根据实验数据得到压

2、降、漏液关联式以指导工业应用。本文用二氧化碳解吸实验测得了各种塔板的传质效率，同时与Fl浮阀进行了压降和传质效率的比较。实验结果表明，由于分布孔小，这几种塔板漏液很少，剩余压降增大导致湿板压降较大，传质效率与浮阀差不多：其中丝网罩的综合性能较好，在工业上有较好的应用前景。本文还选用了一种新型微孔材料一连续式带状泡沫镍作为塔板，研究了其塔板压降和传质效率的变化规律，同时与浮阀塔板进行了比较。实验表明，该种泡沫镍塔板的性能比浮阀塔板更好，在工业上有较好的应用前景。关键词：气液传』瓢微孔塔扳、流体力学性能、塔板

3、压降、漏液、清液层高度、剩余压降、传质效率。V√ABSTRACTTraycolumnisatypeofimportantgas—liquidcontactequipmentinthechemicalandpetroleumindustry,andithasrecentlyshownstronggrowthtendencyinanewcompetitionwithpackedcolumn．Threetypesofmicro-holemasstransferunit——wiregauzecap，smallho

4、lecapandcoppergridporouscap，whichweredesignedasdifferentshapesandheights，weredevelopedinthispaper．Thehydrodynamicperformanceoftheseplateswasinvestigatedbyusingair-watersysteminacolumnwithsidelengthof500mm×．500mm,andthecorrelationsofplatepressure—drop，weep

5、ingandclearliquidheight、vimweirheight，liquidstrengthorFfactorwereobtained．Itcouldbeusedconvenientlyinindustrialapplications．ThemasstransferefficiencyofthoseunitswasdeterminedbyexperimentofC02desorption．Atthesametime，thepressuredropandmasstransferefficienc

6、ywerecomparedwiththoseofFIvalvetray．ItshowedthatweepingWasmuchlessthanthatofF1valvetrayduetosmallholes，whiletheplatepressure—dropwashigherthanthatofF1valvetrayowingtoresidualpressuredrop，andthemasstransferefficiencywasalmostashighasthatofF1valvetray．Compa

7、redwithotherunits，theperformanceofwiregauzecapsWaSbetteranditcouldbeusedinindustry．Inaddition，anothermaSstransferunitwithanewtypeofporousmaterial～continuousnickelfoam，Wasalsodevelopedinthispaper．Therulesoftraypressuredropandmasstransferefficiencywerealsos

8、tudiedinexperiment．ItshowedthattheperformanceofthisunitWasmoreexcellentthanthatofF1valvetray,anditcouldbeusedinindustry．Keywords：gas—liquidmasstransfer,micro·holetray,hydrodynamicperformance，platepressuredrop，weepin