试析悬挂式降液管自液封的研究

《试析悬挂式降液管自液封的研究》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、浙江工业大学硕士学位论文悬挂式降液管自液封的研究姓名：李育敏申请学位级别：硕士专业：化学工程指导教师：俞晓梅2001.6.1浙江工业大掌硕士掌位论文摘要Y五08000f。-它，?I／{I悬挂式降液管塔板要求降液管能自液封，以防止气体漏入降液管，降低塔板效率。因此，在塔板的负荷性能图上要增加一条自封线。以往设计使用的自封线或过于粗糙，或以基本上不允许降液管漏气为标准而过于保守，缩小了塔板的稳定操作区，它们都在一定程度上限制了塔板的设计∥本论文旨在采用新的自封标准通过实验得到新的自封线，要求自封线既不降低塔板效率，又能扩大塔板的稳定操作区。实验在300X200毫米的透明奄垫夔埴短形搭中进行，以空

2、气一水为体系，以单位时间内漏气次数是1次／秒作为自封标准，测定自封线，并且通过析因实验以确定液流孔面积和气液密度对自封线的影响。本文建立漏气模型，推导出漏气对板效率的影响；通过计算，本自封标准的漏气使板效率大约下降O．0262％～0．0728％，可以说不影响板效率。为了能从自封机理(即自封的流体力学性能)上说明问题，本文从理论上探讨了波动机理和漏气机理，并在实验上进行了一定程度的验证。本文还通过实验测定了液流孔的孔流系数和液流孔的持液率。实验结果表明：新自封线优于以往的自封线。当气液密度的比值(PJP：)增大时，自封所需的液流阻力h。需相应增大。关键词：悬挂式降液管自封线自封机理浙4zm^掌

3、Ⅲ士掌位论文ABSTRACTSuspendeddowncomersoftrayshouldbeself-sealedinordertopreventvaporfromascendingthroughbottomholesofdowncomers．Trayefficiencywouldbereducedwhenvaporascendsthroughthedowncomer．Aself-seallinewasneededinthehydraulicperformancediagramoftray．Itwasconservativethatalmostnovaporwasallowedtoasce

4、ndfromthedowncomerinthepreviousself-sealcorrelation．Therangeofsatisfactoryoperationwouldbeshrunkwhenthepreviousself-sealcorrelationwasusedinthetraydesign．Theeffectofself-sealonthetrayefficiencywasstudiedinthisthesis．Newself-sealconditionWaSdeterminedintheexperiments．Experimentswerecardedoutina300x2

5、00plexiglasscolumninair-watersystem．Gas-leakingfrequencyusedinself-sealcurvewas1timepersecond．Self-sealcurvewaSdetermined．Theeffectsofthedowncomerbottomarea，liquiddensityandvapordensityontheself-sealcurvewerealsostudiedinthethesis．Gas-leakingmodelwasestablished．Theeffectofthegas—leakingonthetrayeff

6、iciencyWaSderived．Aftercalculating，gas-leakinginnewself-sealcurvewouldreducedthetrayefficiencyby0．0262％-0．0728％．。Liquidfluctuationandgas-leakingmechanismswerestudiedandensuredbyexperiments．Theorifice·flowingcoefficientandliquidhold-upratioofthebottomholeofthedowncomerweretestedTheresultsshowedthatt

7、herangeofsatisfactoryoperationwasenlargedusingnewself-sealcorrelationintraydesign．Whentheratioofvapordensitytotheliquid)浙4Im大n3e．硕士掌位论文density(队·／pL)increased，theessentialself-sealliquid．flowingresistance(h