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1、SEPARATIONSCIENCEANDENGINEERINGChineseJournalofChemicalEngineering,17(6)949—954(2009)EffectofWorkingTemperatureontheResistanceCharacteristicofa*PleatedStainlessSteelWovenFilterLIJuan(李娟)**,SHIYumei(石玉美)andWANGRongshun(汪荣顺)InstituteofRefrigerationandCryogen
2、ics,ShanghaiJiaoTongUniversity,Shanghai200240,ChinaAbstractEffectofworkingtemperatureontheresistancecharacteristicincludingthepermeabilitycoefficientandthepressuredropevolutionofapleatedstainlesssteelwovenfilterwithanominalporesizeof0.5µmhasbeenstudied.The
3、permeabilitycoefficientwasobtainedbasedonthepressuredropdataandtheDarcy’slaw.Inthreefil-trationexperiments,purecarbondioxideat283K,nitrogenat85Kandliquidheliumat18Kareadopted,respec-tively.Itisfoundthatthepermeabilitycoefficientdecreasesattheworkingtempera
4、tureduetothecoldshrinkofthefilterelementatcryogenictemperature.Then,twokindsoffeedslurries,mixtureofliquidnitrogenandsolidcarbondioxideat85K,andmixtureofliquidheliumandsolidnitrogenat18K,flowintothefiltercell.Thesolidparticlesaredepositedonthefiltersurface
5、toformafiltercakeandthepurifiedliquidflowsthroughthefilter.Itisfoundthatthepressuredropevolutionshowsthesametrendonthesetwotemperatures,whichcanbedividedintothreestageswithhighfiltrationefficiency,indicatingthefeasibilityofthefilterforcryogenicapplication.
6、However,variantcakeresistancesareobtained,whichisresultedfromthedifferentinteractionsbetweensolidparticlesinthefeedslurryatlowerworkingtemperature.Keywordsresistancecharacteristic,permeabilitycoefficient,pressuredrop,wovenfilter,workingtemperature1INTRODUC
7、TIONcoefficient,whichisaninherentpropertyofthefiltermedium,andmainlydependsonthephysicalstructureofthefiltersuchasporosity,poresizeandporenum-Pleatedstainlesssteelwovenfilterwithfineporebersperfiltrationarea[13].However,someexternalsizeofseveralmicronsison
8、eofthemostpreferred,factorsincludingworkingtemperaturemayhavesomeeffectiveandeconomicmediaforsolid-liquidsepara-impactonthecoefficient[14].tion.Pleatedstructure,comparedwithnormalflatInthispaper,aseriesofexpe
