杜邦离子膜开车条件

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1、PREFERREDSTARTUPCONDITIONSOFNAFION®MEMBRANES杜邦离子膜首选的开车条件STARTUPCONDITIONSFORNEWMEMBRANES新膜开车条件•Goal:MaintainUniformConductivityDuringStartup目的:使离子膜在开车期间形成均一的导电性•IdealConditions:理想的条件–CurrentDensity:Gradualriseto>4.0kA/m2电流密度逐步升到4.0kA/m2以上–Temperature

2、:温度>70oC(最佳>75oC)–CatholyteStrength:阴极液浓度28-30%NaOH–FeedbrineStrength:入槽盐水浓度210-300gpl(最佳300gpl)–AnolyteStrength:出槽盐水浓度170-230gpl(PH>2)–Uniformtemperature,concentrationsandcurrentthroughoutthecell确信电槽内部有均一的温度、浓度及电流.NewMembraneStartedProperly新膜恰当地开车•G

3、oal:MaintainUniformChannelsDevelopConductivityDuringStartupUniformly,CreatingUniformCurrent目的:使离子膜在开车期间形成Distribution均一的导电性能.离子膜内部通道均匀地形成,这样电流今后可均匀地分布Membrane离子膜NewMembraneBeforeFirstStartup新膜第一次开车之前•WhencurrentisturnedonforIonConductingChannelsthefi

4、rsttime,theionflowwillNeedtobefollowthepathofleastEstablishedresistancethroughthemembrane.第一次通电,离子将会从离子膜电阻最小的部位通过.离子传输通道需•Dangeristhatsomechannels形成willhavehigherresistancethanothers.危险的是部分离子通道形成较高的电阻.Membrane离子膜NewMembraneStartedBadly新膜不好地开车•Whencur

5、rentisturnedonforthefirsttime,theionflowwillSomeChannelsDevelopfollowthepathofleastFirstandBecomeresistancethroughtheOverloaded,Causingmembrane.(见上页)LocalOverheating•Dangeristhatsomechannelswillhavehigherresistancethanothers.(见上页)•Ifsomechannelscarry

6、more有些通道首先形成并且(因oftheloadwhileotherareas离子过多而)超载,导致局部arestilllessconductive,they过热.canbecomedamagedbyMembraneexcessivecurrent.离子膜当部分通道承受过多的电流而其它部位的导电性又差,这些通道会因过多的电流而损坏.WhyAreTheseConditionsImportant?为什么这些开车条件很重要•Whencurrentisturnedonforthefirsttime,t

7、heionflowwillfollowthepathofleastresistancethroughthemembrane.第一次通电,离子将会从离子膜电阻最小的部位通过.•Dangeristhatsomechannelswillhavehigherresistancethanothers.危险的是部分离子通道形成较高的电阻.•Ifsomechannelscarrymoreoftheloadwhileotherareasarestilllessconductive,theycanbecomeda

8、magedbyexcessivecurrent.当部分通道承受过多的电流而其它部位的导电性又差,这些通道会因过多的电流而损坏.•PermanentdamagecanresultinlowerCEandhighervoltage.(这些部分通道)永久性地损坏将导致(该离子膜)电效低和槽压高.VoidDamageDuetoHarshStartup因不当地开车导致(离子膜)空洞损坏CathodeSurfaceView(350X)CrossSectionView(750X)离子膜阴极表面图(放大350倍