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外文翻译--回转烘干机冷却器 英文版.pdf

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外文翻译--回转烘干机冷却器 英文版.pdf

PowderTechnologyDivisionBarrRosinRotaryDryersCoolersandCalciners2RotaryDryersBarrRosinAsamemberoftheGEAGroup,BarrRosinisoneoftheforemostcompaniesinthefieldofindustrialdryingandcooling.Extensiveexperiencehasbeengainedwithawiderangeofthermalprocessingequipmentdesignedtomeetthedemandsofmoderndayprocessindustriesworldwide.WithengineeringandsalesofficesinMaidenheadnearLondonandMontrealCanada,aswellasGEAofficesaroundtheworld,acompleteserviceisavailablefrominitialdesignthroughtofinalcommissioning.EachRotaryDryerinstallationiscustomengineeredtosuittheclientsspecificrequirementsandcomplementsthewellknownrangeofBarrRosinfluidbed,ring,flash,columnandRosinairepaddledryers.TheCascadeDryerDespitetheintroductionofnewtechnology,thelongestablishedRotaryCascadeDryerisstillwidelyregardedastheworkhorseofmanyprocessindustries.Therobustyetsimpleconstructioncombinesflexibilitywithreliability,enablingthistypeofdryertohandleavastrangeofmaterialsandtooperatecontinuouslyunderthemostarduousconditions.Thedesignalsopermitstheuseofthehighestpossibledryingtemperaturesandincontrasttootherdryersisnotsensitivetowidevariationsinmaterialsize,moisturecontentorthroughput.PrinciplesofOperationInitssimplestform,thecascadedryerconsistsofaslightlyinclinedrotatingcylinder,fittedwithaseriesofperipheralflightsarrangedtolift,distributeandtransportthematerial.Theflightsaredesignedtosuittheparticularhandlingcharacteristicsofthematerial,whichmayvarywithincreasingdryness.Theprincipleofoperationisbasedonshowering,orcascadingthewetmaterialthroughahotgasstream,flowingeithercocurrentorcountercurrenttothesolids.Thehotgasinducestheevaporationofthemoisture.Theheatlosttothematerialandevaporationofwatervapourreducesthegastemperaturerapidly,suchthatitleavesthedryeratacomparativelylowtemperature.Theefficiencyofthedryerislargelydependantonthedifferentialbetweentheinletandexhaustgastemperatures,althoughtheheattransferrateisalsoinfluencedbytherelationshipbetweenthedesignofflightsandthespeedofrotation.However,irrespectiveofthegasandmaterialtemperaturesthedryingorresidencetimemaybecritical,asthisisgovernedbytherateofdiffusionofwaterfromthecoretothesurfaceofthematerial.Forspecialapplications,therotarycascadedesignisadaptedtoprovideashortfall,orCruciform,lifterconfiguration.Similarly,RotaryCascadeCoolersandCombinedDryer/Coolersareavailableasrequired.FeedAirHeaterSupportRollersTypicalCoCurrentDryerInstallation3Thechoiceofdustcollectionequipmentwillvaryaccordingtotheapplication,butinadditiontotherangeofhighefficiencyandhighcapacitycyclones,abagfilter,wetscrubberorscrubber/condensercanbesuppliedasrequired.ToAtmosphereDustCollectionDustDischargeDriveUnitProductDischarge4CoCurrentPrincipleCoCurrentdryersarethemostwidelyusedandareparticularlysuitablefordryingmaterialscontainingahighmoisturecontent,whichareheatsensitiveorhaveatendencytostickorcake.Thewetmaterialisincontactwiththegasatitshighesttemperature,whichrapidlyevaporatessurfacemoisture.Theinitialheattransferrateishigh,causinganimmediateandconsiderabledropingastemperature,whichpreventsoverheatingofthematerialandthedryershell.Thefinalproductisincontactwiththegasatitslowesttemperature,enablingthemoisturecontenttobereadilycontrolled,usuallybymaintainingthedryerexhaustgastemperatureatapresetvalue.CounterCurrentPrincipleCounterCurrentdryersaremoresuitableformaterialsthatmustbedriedtoverylowlevelsofmoisture,wherethelasttracesofmoisturearedifficulttoremove,orwhereanelevatedproducttemperatureisdesirable.Theyarealsousedeffectivelyascombineddryer/preheaters.However,sincethefinalproductisincontactwiththegasatitshighesttemperaturethecountercurrentdryerisoftenunsuitableforheatsensitivematerials.Althoughthissystemcanbemoreefficient,moisturewhichistoremainintheproduct,isnotsoreadilycontrolled.HeatingSystemInbothcocurrentandcountercurrentsystems,thematerialisindirectcontactwiththehotdryinggases,whicharenormallysuppliedasproductsofcombustionfromanoil,gasorsolidfuelfiredfurnaceinthetemperaturerange250ºCto1000ºC,asrequired.However,forlowtemperatureandheatsensitiveapplications,orwherecontaminationmustbeavoided,indirectlyheatedaircanbesuppliedviaanelectricorsteamtubetypeexchanger.Thedryernormallyoperatesonatwofan,balanceddraughtsystem,wherebythegasinletismaintainedunderslightlynegativepressuretominimiseairinleakage.Whendryingand/orpreheatingmaterialswhichareunaffectedbyheatorexposuretoaflame,anoilorgasburnercanbearrangedtofiredirectlyintothedrum.Thecombinedeffectsoftheveryhightemperature800ºC1300ºCandtheradiationfromtheflame,ensuresmaximumthermalefficiencywhilereducingthesizeofdryerandthecapacityoftheexhaustsystem.Inthiscasethequenchordilutionairisinducedaroundtheburnerbytheexhaustfan,thuspreventingoverheatingofthedryershell.DirectFiredDryersTime˚CGasTemp.MaterialTemp.˚CGasTemp.MaterialTemp.Time

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