最新CHAPTER 8 Evaporation(蒸发)[1]培训讲学.ppt

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1、CHAPTER8Evaporation（蒸发）Thereasonsforevaporation(concentration):Increasingmicrobiologicalstabilityandshelflife,Reductionintransportandstoragecosts,Increasetheconcentrationpriortotheremovalofremainingwaterbydrying,particularlyspraydrying.Theprincipleisverysimpletheliquidis

2、boiledinasuitablevesselandthevaporisremovedleavingbehindaresidueofconcentratedliquorintheevaporator.__________________________________________________heatingsteam(freshsteam)secondarysteamsingleeffectmultipleeffectdifferentpressuresIntroductionEvaporationheatingandconcen

3、tratingadilutesolutiontoobtainasolidsoluteorrecoverasolvent.Itcanbelookedasaseparationprocessbetweenaninvolatilesoluteandavolatilesolvent.BasicConceptsdilutesolutioncoolingwateruncondensedgasconcentratedsolutionfreshsteamsecondarysteamwaterwater__________________________

4、________________________Steamandvaporvapor一般作为蒸汽的一种现象使用steamn.Thevaporphaseofwater.水的蒸汽形式Amistofcoolingwatervapor.水气水蒸汽冷却形成的薄雾Pressurizedwatervaporusedforheating,cooking,ortoprovidemechanicalpower.steam一般作为蒸汽的动力使用.Steam压力蒸汽用于加热、烹调或提供机械动力的加压水蒸汽Thepowerproducedbyamachineus

5、ingpressurizedwatervapor.蒸汽动力使用加压水蒸汽机器产生的动力Steamheating.蒸汽加热Power;energy.电力；能源steam.__________________________________________________Single-effectandmultiple–effectevaporation__________________________________________________8.1Boiling-PointElevation（沸点升高）Boilingpointel

6、evationofasolution(liquidfood)isdefinedastheincreaseinboilingpointoverthatofpurewater,atagivenpressure.AsimplemethodtoestimateboilingpointelevationistheuseofDuring’srule__________________________________________________Alinearrelationshipexistsbetweentheboiling–pointtemp

7、eratureofthesolutionandtheboilingpointtemperatureofwateratthesamepressure.____________________________________________________________________________________________________Example8.1__________________________________________________8.2TypesofEvaporators（蒸发器的类型）Batch-Ty

8、pePanEvaporator（间歇式锅式蒸发器）NaturalCirculationevaporators（自然循环式蒸发器）Rising-FilmEvaporator（升膜式蒸发器）Falling-fi