lesson 19 fresh water generator

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1、Lesson19FreshWaterGenerator造水机1.Freshwaterisgeneratedonshipbyafreshwatergenerator,alsoknownasevaporator.Theprocessbywhichfreshwaterisgeneratedisknownasdistillationprocess.船上的淡水由造水机（也叫蒸发）器生产。淡水的生产过程也叫蒸馏过程。Seawaterisconvertedintofreshwaterbyevaporatingandcondensingtheseawater.Evaporationofthesea

2、wateriseitherdonebyboilingorbyflashprocess.Freshwatergeneratorscanbeshell-and-tubeorplatetype.通过对海水的蒸发和冷凝，海水转化为淡水。海水的蒸发要么由沸腾要么由闪发来完成。造水机可以是壳管式或者是板式的。2.Afreshwatergeneratorconsistsofmainlytwoparts.Acondenserandanevaporator.造水机主要由两部分组成：冷凝器和蒸发器。Theboilingprocessisdoneeitherbyaheatingcoilorbyusing

3、thehightemperaturemainenginejacketwater.Generallywaterisboiledat100°C.沸腾过程要么由加热盘管要么由高温的主机缸套水来完成。通常水在100℃时沸腾。butinafreshwatergeneratoritisdoneataround60-70°Corevenlowerforsomemoderntypes.Forthispurpose,eductorsorairejectorsareused.Ejectorsreducethechamber’spressuretosuchapointthatwaterstartsboi

4、lingatalowertemperature.但是，在造水机里60-70℃的温度就沸腾了，一些新型造水机甚至更低。为了达到这个目的，使用喷射泵或者空气抽吸器。喷射泵降低腔室内部的压力使水在温度较低时就开始沸腾。3.ThefollowingwilldescribeamoderntypeofAlfaLavalfreshwatergenerator:下面将介绍一种新型的阿法拉伐造水机：4.Thisfreshwatergeneratorusesvacuumdistillationtoconvertseawaterintohigh-qualityfreshwaterandisdesigne

5、dforautomaticoperationinperiodicallyunmannedengineroomsandotherautomatedoperations.这种造水机使用真空蒸馏法把海水转化为高质量的淡水，为定期无人机舱和其它自动运转而设计。Itscapacitymayrangefrom4to35m3/24h,dependingontheheatingmediumandcoolingwatertemperatures.它的造水量范围是4—35立方每24小时，取决于加热介质和冷却水的温度。Thefreshwatergeneratorcanbedimensionedtosui

6、tanyjacketwatertemperaturefrom55--95℃atanycoolingwatertemperaturerequired.造水机结构能够对应于冷却水的任何温度，可以适应55-95℃之间的缸套水的任何温度。Thequantityoffreshwaterproducedcanbealteredbyvaryingthenumberofplatesintheheatexchangerassemblies.通过改变热交换器组件中的板片数量来调节造水量。Thebasicequipmentofthefreshwatergeneratorincludestitaniump

7、lateheatexchangersforevaporatorandcondenser,generatorshell,two-stagebrine/airejector,freshwaterpumpandfreshwatercontrolsensorandframe.造水机的基本部件包括用于蒸发器和冷凝器的钛合金板热交换器，造水机壳，二级盐水/空气喷射泵，淡水泵，淡水控制传感器和机架。Additionalequipmentnecessaryforoperationin