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1、RelatedCommercialResourcesCHAPTER28INDUSTRIALDRYINGSYSTEMSMechanismofDrying...................................................................................................................28.1ApplyingHygrometrytoDrying...............................
2、....................................................................28.1DeterminingDryingTime............................................................................................................28.1DryingSystemSelection.........................
3、......................................................................................28.3TypesofDryingSystems...............................................................................................................28.3RYINGremoveswaterandotherl
4、iquidsfromgases,liquids,Example1.Adryerhasacapacityof90.5lbofbone-drygelatinperhour.Dandsolids.Thetermismostcommonlyused,however,toInitialmoisturecontentis228%bone-drybasis,andfinalmoisturecon-describeremovingwaterorsolventfromsolidsbythermalmeans.ten
5、tis32%bone-drybasis.Foroptimumdrying,supplyairisat120°Fdband85°Fwbinsufficientquantitythattheexhaustairis100°FdbDehumidificationreferstothedryingofagas,usuallybyconden-and84.5°Fwb.Makeupairisavailableat80°Fdband65°Fwb.sationorbyabsorptionwithadryingag
6、ent(seeChapter22oftheFind(1)therequiredamountofmakeupandexhaustairand(2)the2005ASHRAEHandbook—Fundamentals).Distillation,particu-percentageofrecirculatedair.larlyfractionaldistillation,isusedtodryliquids.Itiscost-effectivetoseparateasmuchwateraspossib
7、lefromaSolution:Inthisexample,thehumidityineachofthethreeairstreamssolidusingmechanicalmethodsbeforedryingusingthermalmeth-isfixed;hence,therecycleratioisalsodetermined.RefertoASHRAEods.Mechanicalmethodssuchasfiltration,screening,pressing,Psychrometri
8、cChartNo.1toobtainthehumidityratioofmakeupairandexhaustair.Tomaintainasteady-stateconditioninthedryer,watercentrifuging,orsettlingrequirelesspowerandlesscapitaloutlayevaporatedfromthematerialmustbecarriedawaybyexhaustair.perunitmassofwaterremo
