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1、AdvancedFeedWaterandCoolingWaterTreatmentatCombinedCyclePowerPlant469AdvancedFeedWaterandCoolingWaterTreatmentatCombinedCyclePowerPlantRyoTakeishi*,KunihikoHamada*,IchiroMyogan*,ShigeoMitsuma***FujiElectricSystemsCo.,Ltd.PlantDesignDepartment1-1,Tanabeshinden,Kawasak
2、i-ku,Kawasaki-city,210-9530,Japan**TokyoGasYokosukaPowerCo.,Ltd.2931-71,Uragocho5-Chome,Yokosuka-city,237-0062,Japan(E-mail:ryo-takeishi@fesys.co.jp)Abstract:TokyoGasYokosukaPowerStationisanIPPcombinedcyclepowerplantsuppliedbyFujiElectricSystemsCo.,Ltd.inJapan.Thispo
3、werplantappliesthefollowingadvancedWaterChemistrythatismainlyintendedtominimizeenvironmentalimpact.TheplanthasbeenincommercialoperationsinceJune2006.1.FeedwatertreatmentinacombinedcycleIncombinedcycleplants,therearedifferentpossiblewaysofchemicaltreatmentinthesteamwa
4、tercycle.Dependingontheplantdesign,theplannedmethodofoperationandenvironmentalissuesmayinfluencetherightchoiceforchemicaltreatment.ForthecombinedcyclepowerplantatYokusuka,AVT(allvolatiletreatment)wasselected.2.TreatedsewageapplicationforcondensercoolingwaterAcirculat
5、ingcoolingwatersystemthatusestreatedsewagefromsewagedisposalplantasitsmake-upwaterwasadoptedwithtreatedsewageconcentratedintoaboutfivecyclesduringcoolingtowercirculation.Treatedsewagehasrecentlybeenwidelyutilizedinmanyfields,thoughinmanycasesitisusedforonce-throughco
6、oling.Itisstillrare,however,tousetreatedsewageinahighlyconcentratedconditionasincoolingtowersystems.Keywords:Combinedcycle,Allvolatiletreatment,Sewage,HRSG1INTRODUCTIONTokyoGasYokosukaPowerStation(Fig.1)isanIPPcombined-cyclepowerplantsuppliedbyFujiElectricSystemsCo.,
7、Ltd.inJapan.TheplanthasbeenincommercialoperationsinceJune2006,andiscurrentlyoperatingwell.Theratedoutputofthisplantis240MW.ThispowerplantappliesthefollowingadvancedWaterChemistrythatismainlyintendedtominimizeenvironmentalimpact.AmongthemethodsselectedwasAllVolatileTr
8、eatment(AVT)forfeedwatertreatmentoftheHeatRecoverySystemGenerator(HRSG).SodiumphosphateistypicallyusedtotreatthefeedwateroftheHRSG.
