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ID:35128959
大小:1.46 MB
页数:63页
时间:2019-03-19
《试析陶瓷膜错流微滤悬浮液过程的非稳态模拟》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、太原理工大学硕士学位论文陶瓷膜错流微滤悬浮液过程的非稳态模拟姓名:马智英申请学位级别:硕士专业:化学工程指导教师:孙彦平20070501太原理工大学硕士研究生学位论文陶瓷膜错流微滤悬浮液过程的非稳态模拟摘要微滤是目前所有膜技术中应用最广、经济价值最大的技术,广泛应用于各工程领域流体中微粒的分离与净化。错流微滤过程的模拟一直是研究的热点,但是大多为稳态模拟,鲜有非稳态模拟报道。因膜通量随时间不断下降直至趋于稳定是错流微滤过程的显著特征,故本文对错流微滤碳酸钙悬浮液非稳态过程进行理论和实验研究,获得适用较广操作条件范围的非稳态数学模型。本文引入膜通量下降率∥厶,由于膜纯水通量山
2、体现了膜的特性,使单独分析错流微滤过程膜面区域成为可能,过程分析明显简化。从近膜面微粒的受力分析出发,对错流微滤过程进行因次分析,获得两个与传统形式相同、但具有特殊意义的新特征量Eum和Re。。在错流微滤分离机理基础上,建立了包含Eu,秀IIRe。的非稳态膜通量数学模型:一百dJ=tqcoJ-x2Eu,,aRe。,//上式经积分得到不同时间下膜通量的数学表达式.,:垡掣+(山一丝掣)唧(一ktcot)’IqCO—C0实验使用19孔道的口-A1:0。陶瓷膜,对不同料液性质和操作条件下的膜通量进行测定。用Fortran90Marquardt非线性拟合程序对模型中所含待定参数两、
3、心进行回归,结果显示K、岛不受操作条件的影响。模型在下列较宽参数范围与实验拟合良好,平均相对误差为4.4%:太原理工人学硕士研究生学位论文微粒粒径操作压差错流速率料液浓度2≤d。/a.≤9(本实验0.4pm4、CERAMICMEMBRANEABSTRACTMicrofiltration,themostwidelyusedandeconomicaltechnologyinmembraneprocessing,isailincreasinglyimportanttechniquefortheseparationandpurifyofparticulatesuspensionsinengineeringareas.It’sbeenthehotissuefortheresearchonsimulationofcross-flowmicrofiltratinprocess,butthemo5、stofsimulationswereforsteady-state,fewforunsteady-state.Incross—flowmicrofiltrationprocess,itisasignificantcharacteristicthatmembranefluxdecreaseswithtime,SOinthispaper,theoryandexperimentalstudiesontheunsteady-stateprocessofcross-flowmicrofiltrationofCaC03suspensionhavebeendonetoacquireth6、eunsteady-statemathematicalmodelwhichcanbeusedinwideoperationconditions.AsJoisamembranefluxofpurewaterandrelatedtoallstructurecharactersofmembrane,therateofmembranefluxdeclineJ/dointroducedinthispaperimpartsthepossibilitytosolelyanalyzethemembranesurfaceareaformarkedlyreducingprocessanalys7、is.Startingwiththeforcebalanceforoneparticlenearthemembranesurface,twonovelcharacteristicparametersRe。andEuhavebeendeducedoutbyusingdimensionalanalysismethod,whicharesimilartotraditionalReynoldsnumberandEulernumberinforms,buthavem太原莲工人学硕上研究生学位论文specialmeanings
4、CERAMICMEMBRANEABSTRACTMicrofiltration,themostwidelyusedandeconomicaltechnologyinmembraneprocessing,isailincreasinglyimportanttechniquefortheseparationandpurifyofparticulatesuspensionsinengineeringareas.It’sbeenthehotissuefortheresearchonsimulationofcross-flowmicrofiltratinprocess,butthemo
5、stofsimulationswereforsteady-state,fewforunsteady-state.Incross—flowmicrofiltrationprocess,itisasignificantcharacteristicthatmembranefluxdecreaseswithtime,SOinthispaper,theoryandexperimentalstudiesontheunsteady-stateprocessofcross-flowmicrofiltrationofCaC03suspensionhavebeendonetoacquireth
6、eunsteady-statemathematicalmodelwhichcanbeusedinwideoperationconditions.AsJoisamembranefluxofpurewaterandrelatedtoallstructurecharactersofmembrane,therateofmembranefluxdeclineJ/dointroducedinthispaperimpartsthepossibilitytosolelyanalyzethemembranesurfaceareaformarkedlyreducingprocessanalys
7、is.Startingwiththeforcebalanceforoneparticlenearthemembranesurface,twonovelcharacteristicparametersRe。andEuhavebeendeducedoutbyusingdimensionalanalysismethod,whicharesimilartotraditionalReynoldsnumberandEulernumberinforms,buthavem太原莲工人学硕上研究生学位论文specialmeanings
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