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1、TheThermalCalculationandEconomicalAnalysisoftheFeedPumpTurbineon300MWDirectAir-CoolingUnitsABSTRACTInordertoimprovetheeconomicalefficiencyofoperationofpowerplant,inadditiontoimprovingunitefficiency,wemustalsopayattentiontotheoperationandconfigurationofauxiliary.Boilerfeedpu
2、mpisanimportantauxiliaryequipment,itdrivestheworkingfluidtocycle・Thetwomaindrivingmodesoffeedpumpsaremotor-drivenmodeandsteam-drivenmodeinChinapowerstations,whichmodeisbetterneedsforanalysisbecauseofdifferentevaluationcriteria.Fordirectaircoolingpowerplants,nomatterselectin
3、gthedrivemodeorschemewillneedtoconsidermanyactualfactors,almostalltheearlyair-coolingunitschosemotor-drivenmodeandthere'sfewerresearchabouttheapplicationofboilerfeedpumpturbineinaircoolingunits.Withthethermalpowerplantunitcapacityincrease,motor-drivenmodewillcausehigherpowe
4、rconsumption.Thispapertakes300MWdirectair-coolingunitsastheresearchobject,inordertocomparethethermaleconomyofmotor-drivenmodeandsteam-drivenmode,weestablishedthemathematicalmodelofcomprehensiveefficiency,internetnetpower,powerconsumptionrate,heatrateandcoalconsumptionratewh
5、ichcanbecalculatedbypowerplantstochoosedrivingmodeoffeedpumps.Fortheactualsituationofapowerplant,wegottheconclusionthatsteam・drivenmodehasahigherthermaleconomythanmotor-drivenmodewhichcanreducepowerconsumptionrateandincreaseinternetnetpower.Thenwestudiedthetechnicalandecono
6、micalcomparativemethodsofdifferentdrivingscheme,alsostudiedthetechnicalfeatureofthemotor-drivenschemeandthreesteam-drivenschemesthathavedifferentexhauststeamcoolingway.Takingoneprojectofturningmotor-drivenfeedpumpintosteamfeedpumpasexample,inthedirectaircoolingschemeofsteam
7、feedpump，themainsteamshouldbeincreasedtoensurethegeneratorpowerunchanged,thatwillaffectthecoolingcapacityoftheaircoolingcondenser.Onaccountofthis,apeakcoolingsystemshouldbeusedtoincreasethecoolingareaandreducesthebackpressure.Bycomparingthetechnicalconditions,initialinvestm
8、entsandinvestmentreturnsofeachsteampumpscheme,wcchosethedirectaircoolingschemeofst
