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1、ALarge-CapacityPressurized-Fluidized-Bed-Combustion-BoilerCombined-CyclePowerPlantOVERVIEW:Toimprovethethermalefficiencyandenvironmentalcharacteristicsofcoal-firedpower-generationsystems,TheChugokuElectricPowerCo.,Inc.andtheHitachiGroupdevelopedthefirstcommercia
2、l250-MWPFBC(pressurizedfluidizedbedcombustion)combined-cyclepowerplantinOsaki.TheOsakiPFBCplantwascommissioned,anditscommercialoperationbeganonNov.30,2000.Wewilldescribethemainfeaturesoftheequipmentandseveraltrial-operationresultsoftheOsakiPFBCplant.Theplanthasa
3、combined-cyclearrangementwiththegasturbineandsteamturbineproducinganoutputofapproximately15and85%,respectively,ofthetotalelectricity.Italsohasapressurized-fluidized-bed-combustionboiler,whichgeneratessteamtodrivethesteamturbine.Thegasfromtheboilerisdirectedtoatw
4、o-stagemulti-cyclone,whichdrivesthegasturbine.Theboilerconsistsoftwovesselswithtwofurnaces.INTRODUCTIONASglobalenvironmentalproblemsarebecominganimportantmatterofinternationalconcern,thedemandforcoal-firedthermalpowerstationsthatcanreducetheCO2emissionsthroughth
5、eimprovementoftheirthermalefficiencyandminimizetheemissionsofSOx,NOx,soot,anddustfromtheboilersisincreasing.Thiscanbeachievedbythedevelopmentofanewpower-generationsystem.Recently,theHitachiGroupsuppliedtheOsakiPowerStationofTheChugokuElectricPowerCo.,Inc.,witha2
6、50-MWpressurized-fluidized-bedcombustion(PFBC)-boilercombined-cyclepowerFig.1—250-MWPressurized-Fluidized-Bed-Combustion-BoilerCombined-CyclePowerPlantDeliveredtoOsakiPowerStationofTheChugokuElectricPowerCo.,Inc.(Series1,Unit1-1).plantasUnit1-1.Thisisacompact,ef
7、ficient,andenvironmentallyfriendlycoal-firedthermal-powerplant.Todevelopthispowerplant,fromitsdesignandfabricationtoinstallationandtestoperation,theHitachiGroupledcomprehensivediscussionswithTheChugokuElectricPowerCo.,Inc.,thatincludedajointstudyatthe4-MWtestpla
8、ntoftheThermalPowerGenerationTechnicalCenterofthecompany.Followingthecompletionoftheinstallationthattooksome40monthsafterthestartoftheconstructionworkinNovember1995,t
