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PERFORMANCE,FORM17PRESSURECOMPARINGTHEPERFORMANCEOFADOUBLEINLETCYCLONEWITHPOWDERTECHNOLOGY1452004OPERATIONHOWEVER,THEINCREASINGEMPHASISONENVIRONMENTPROTECTIONANDGAS–SOLIDSEPARATIONISINDICATINGTHATFINERANDFINERPARTICLESMUSTBEREMOVEDTOMEETTHISCHALLENGE,THEIMPROVEMENTOFCYCLONEGEOMETRYANDPERFORMANCEISREQUIREDRATHERTHANHAVINGTORESORTTOALTERNATIVEUNITSMANYRESEARCHERSHAVECONTRIBUTEDTOLARGEVOLUMEOFWORKONIMPROVINGTHECYCLONEPERFORMANCE,BYINTRODUCINGNEWINLETDESIGNANDOPERATIONVARIABLESTHESEINCLUDESTUDIESOFTESTINGACYCLONICFRACTIONATORFORRESEARCHERS,WASDEVELOPED,ANDTHEEXPERIMENTALSTUDYONADDRESSINGTHEEFFECTOFINLETTYPEONCYCLONEPERFORMANCESWASPRESENTED2EXPERIMENTALTHREEKINDSOFCYCLONESEPARATORSWITHVARIOUSINLETGEOMETRIES,INCLUDINGCONVENTIONALTANGENTIALSINGLEINLETHAVEBECAMEONEOFMOSTIMPORTANTPARTICLEREMOVALDEVICETHATPREFERABLYISUTILIZEDINBOTHENGINEERINGANDPROCESSCLEANAIRBYLIMETAL6INTHISPAPER,THENEWINLETTYPE,WHICHISDIFFERENTTYPEOFINLETFROMTHATUSEDBYFORMERSIMPLICITYTOFABRICATE,LOWCOSTTOOPERATE,ANDWELLADAPTABILITYTOEXTREMELYHARSHCONDITIONS,CYCLONESEPARATORSKEYWORDSCYCLONE;SYMMETRICALSPIRALINLET;COLLECTIONEFFICIENCY;PRESSUREDROP1INTRODUCTIONCYCLONESEPARATORSAREWIDELYUSEDINTHEFIELDOFAIRPOLLUTIONCONTROLANDGAS–SOLIDSEPARATIONFORAEROSOLSAMPLINGANDINDUSTRIALAPPLICATIONS1DUETORELATIVE2,DEVELOPINGAMATHEMATICMODELTOPREDICTTHECOLLECTIONEFFICIENCYOFSMALLCYLINDRICALMULTIPORTCYCLONEBYDEOTTE3,TESTINGAMULTIPLEINLETCYCLONESBASEDONLAPPLE’TYPEGEOMETRYBYMOOREANDMCFARLAND4,DESIGNINGANDTESTINGARESPIRABLEMULTIINLETCYCLONESAMPLERTHATMINIMIZETHEORIENTATIONBIASBYGAUTAMANDSTREENATH5,ANDPARTICLESIZEANDFLOWRATEINTHISPAPEREXPERIMENTALRESULTINDICATEDTHATTHESYMMETRICALSPIRALINLETSSI,ESPECIALLYCSSIINLETGEOMETRY,HASEFFECTONSIGNIFICANTLYINCREASINGCOLLECTIONEFFICIENCYWITHINSIGNIFICANTLYINCREASINGPRESSUREDROPINADDITION,THERESULTSOFCOLLECTIONEFFICIENCYANDPRESSUREDROPCOMPARISONBETWEENTHEEXPERIMENTALDATAANDTHETHEORETICALMODELWEREALSOINVOLVEDSHORTCOMMUNIDEVELOPMENTOFASYMMETRICALCYCLONESEPARATORBINGTAOZHAO,HENGGENDEPARTMENTOFENVIRONMENTALENGINEERING,DONGHUAUNIVERSITYRECEIVED28OCTOBER2003;RECEIVEDINREVISEDAVAILABLEONLINEABSTRACTTHREECYCLONESEPARATORSWITHDIFFERENTINLETGEOMETRYWEREDESIGNED,DIRECTSYMMETRICALSPIRALINLETDSSI,ANDACONVERGINGSYMMETRICALPERFORMANCECHARACTERISTICS,INCLUDINGTHECOLLECTIONEFFICIENCYANDSAMPLINGTHATUSEDMULTIPLEINLETVANESBYWEDDINGETALCORRESPONDINGAUTHORTEL862162373718;FAX862162373482EMAILADDRESSZHAOBINGTAOMAILDHUEDUCNBZHAOSHEN,YANMINGKANGNO1882,YANANRD,SHANGHAI,SHANGHAI200051,CHINA24FEBRUARY2004;ACCEPTED3JUNE2004JULY2004WHICHINCLUDEACONVENTIONALTANGENTIALSINGLEINLETCTSI,ASPIRALINLETCSSITHEEFFECTSOFINLETTYPEONCYCLONEDROP,WEREINVESTIGATEDANDCOMPAREDASAFUNCTIONOFCATIONSPIRALINLETTOIMPROVE47–50CTSI,DIRECTSYMMETRICALSPIRALINLETDSSI,ANDCONVERGINGSYMMETRICALSPIRALINLETCSSI,WEREMANUFACTUREDANDSTUDIEDTHEGEOMETRIESANDDIMENSIONSTHESECYCLONESAREPRESENTEDINFIG1ANDTABLE1TOEXAMINETHEEFFECTSOFINLETTYPE,ALLOTHERDIMENSIONSWEREDESIGNEDTOREMAINTHESAMEBUTONLYTHEINLETGEOMETRYTHEPRESSUREDROPSWEREMEASUREDBETWEENTWOPRESSURETAPSONTHECYCLONEINLETANDOUTLETTUBEBYUSEOFADIGITALBY015–115AND040–240INTHETESTEDVELOCITYRANGEFIG4A–DCOMPARESTHEGRADECOLLECTIONEFFICIENCYOFTHECYCLONESWITHVARIOUSINLETTYPESATTHEFLOWRATEOF3FIG2SCHEMATICDIAGRAMOFEXPERIMENTALSYSTEMSETUPBZHAOETAL/POWDERTECHNOLOGY145200447–5048MICROMANOMETERSINAP,DP1000IIICTHECOLLECTIONEFFICIENCYWASCALCULATEDBYTHEPARTICLESIZEDISTRIBUTION,BYUSEOFMICROPARTICLESIZEANALYZERSPSI,LKY2DUETOHAVINGTHESAMESYMMETRICALINLETINMODELBORC,THEFLOWRATEOFEACHINLETOFMULTIPLECYCLONEWASEQUALTOANOTHERANDCONTROLLEDBYVALVE;TWONOZZLETYPESCREWFEEDERSWEREUSEDINSAMEOPERATINGCONDITIONSTODISPERSETHEPARTICLESWITHACONCENTRATIONOF50G/M3ININLETTUBETHESOLIDPARTICLESUSEDWERETALCUMPOWDEROBEYEDBYLOGNORMALSIZEDISTRIBUTIONWITHSKELETALDENSITYOF2700KG/M3,MASS–MEANDIAMETEROF597AM,ANDGEOMETRICDEVIATIONOF208THEMEANATMOSPHERICPRESSURE,AMBIENTTEMPERATURE,ANDRELATIVEHUMIDITYDURINGTHETESTSWERE9993KPA,293K,ANDLESSTHAN75,RESPECTIVELY3RESULTSANDDISCUSSIONTHEEXPERIMENTALSYSTEMSETUPISSHOWNINFIG2FIG1SCHEMATICDIAGRAMOFCYCLONESGEOMETRIESACONVENTIONALTANGENTIALSINGLEINLET,MODELA;BDIRECTSYMMETRICALSPIRALINLET,MODELB;CCONVERGINGSYMMETRICALSPIRALINLET,MODELC31COLLECTIONEFFICIENCYFIG3SHOWSTHEMEASUREDOVERALLEFFICIENCIESOFTHECYCLONESASAFUNCTIONOFFLOWRATESORINLETVELOCITIESITISUSUALLYEXPECTEDTHATCOLLECTIONEFFICIENCYINCREASEWITHTHEENTRANCEVELOCITYHOWEVER,THEOVERALLEFFICIENCYOFTHECYCLONEWITHSYMMETRICALSPIRALINLETBOTHMODELSBANDCWASALWAYSHIGHERTHANTHEEFFICIENCYOFTHECYCLONEWITHCONVENTIONALSINGLEINLETMODELAATTHESAMEVELOCITY;ANDESPECIALLY,THECYCLONEWITHCSSI,MODELCHASAHIGHESTOVERALLEFFICIENCYTHESEEFFECTSOFIMPROVEDINLETGEOMETRYCONTRIBUTETOTHEINCREASEINOVERALLEFFICIENCYOFTHECYCLONETABLE1DIMENSIONSOFCYCLONESSTUDIEDUNITMMDDEHHBSAB300150450120011251501506038834,51980,65367,AND77262M/H,WITHTHEINLETVELOCITIESOF1199,1604,2018,AND2385M/S,RESPECTIVELYASEXPECTED,THEFRICTIONALEFFICIENCIESOFALLTHECYCLONESARESEENTOINCREASEWITHINCREASEINPARTICLESIZETHESHAPESOFTHEGRADECOLLECTIONEFFICIENCYCURVESOFALLMODELSHAVEASOCALLED‘‘S’’S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