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外文翻译--25MW高效秸秆燃烧发电厂.doc

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外文翻译--25MW高效秸秆燃烧发电厂.doc

25MWStrawFired,HighEfficiencyPowerPlant1.AimTheaimoftheproposedprojecthasbeentodesign,construct,ownandoperateanewelectricitygenerationcapacitybasedonrenewableenergysources,inthiscaseonstraw,withthepossibilityofaddingwoodchips,withasoundtechnologicalandeconomicalbasis.Theowner,EHN,expectsthisprojecttopromotetheimplementationofitsfuturestrategiesandplansinitsfieldsofactivity.Bioenergycropsarealreadybeinginvestigatedatdemonstrationscaleasafuelalternative,also.Fromthepointofviewoftechnologicaldevelopment,theaimhasbeentodemonstratetheinnovativetechnicalsolutions,highefficiencysteamboilerwithhighsteamtemperatureforwoodandstrawfiringwithnewsuperheaterconstruction,tosolveslaggingandcorrosionproblemsuptonowrelatedtocombustionofstraw.Thesuccessfuldemonstrationhascreatedandwillcreatenewprojectandjobopportunitiesbyofferingaviablesolutiontoexploitdifficultbiomassfuelswhichcurrentlyaretreatedmostlyaswaste.2.IntroductionPhoto1ViewoftheSangüesaPowerPlantwithstrawbarnontheright,andboilerbuildingontheleftThepowerplantisanelectricitygenerationfacilitybasedonrenewableenergy,whichsuppliesanetamountof25MWofelectricitytothegrid.Anadditionalpowerproductionofabout2.5MWofelectricityisgeneratedforconsumptionintheownoperationsystemsoftheplant,andheatproductionisnowadaysreleasedatthecondensingsystem,whichiscooledbyawaterintakefromanirrigationchanneloftheIratiriver.Theplantoperationavailabilityisexpectedtobe8.000hours/year,whichleadstoanannualelectricityproductionof200GWh.TheplantislocatedattheIndustrialAreaofRocaforte,nearthelocalityofSangüesa,intheregionofNavarra,Spain.Thetechnologyisbasedonaninnovativebiomassboiler,togetherwithaconventionalsteamcircuitandsteamturbineprocess.Thecoretechnologyislocatedintheboiler,whichincludesnovelhangingplatensuperheatersforthesteam,specificallydesignedwithspecialmaterialsandshapesforminimizingcorrosionontheirsurface.Italsoincludesavibratinghydrogratemadeoftwodifferentsections,andaninnovativefeedingsystemdesign,includingsafetydevicesforfireprevention.Thewholeboilerandfeedingsystemisanimproveddesignofthetechnologicalpartner,theDanishcompanyFLSmiljø.Asfuel,theplantisinitiallydesignedforusingonlystraw100,andalsomixturesofwoodchipsandstrawupto50inheatvalues.Atthemoment,onlytheinvestmentsinfacilitiesandlogisticsforstrawhavebeencarriedout,butenoughspaceisavailablefortheconstructionofanadditionalbarnandfeedingsystemsforwoodchips.Annualfuelconsumptionoftheplantis160000tons/yearofstraw,mainlyofwheat,barleyandcorn,allofwhichiscollectedallaroundtheregion.Logisticsforfuelcollectioninthefields,handling,transportandstorageincludelongtermcontractswithfarmersandservicecompaniesinordertoprovidethewholeannualsupply.Theplantfirstconnectiontothegridwasachievedon25thJune2002.Afterseveraloperationteststheplanthasreachedfullloadoperation,andresultsarecompletelysuccessful.3.TechnicaldescriptionBoilerThestrawandwoodfiredboilerisanimprovedFLSmiljødesign.Itincludesavibratinghydrogratespeciallydefinedforhandlingthespecificqualityofthestrawtobeburnt.Thegrateismadeintwosectionsthatenabletheuseofstraworamixtureofwoodandstrawasfuel,havinglowashmeltingtemperatureanddifficultsinteringorslaggingproperties.Thestrawisfedtotheboilerthroughfourmechanicalfeedopenings.Thetransportationoftheburningmassandtheashthroughthegrateismadebytheashremovalsystem,whichperiodicallyvibrates,duringafewsecondsevery5minutes.Thecycleofvibrationandtheintervalsareadjustedduringthecommissioningoftheboilerdependingonthequalityofthestraw.Thegrateitselfismadeasaboilerpanelwall,includingperforationsforinputofthecombustionair.Thistypeofgratehasverylowmaintenancecostsandhighreliability.Photo2Boiler,turbineandofficesbuildingsAshthatfallsdownfromthegrateisthentransportedtoacontainer,andtheflyashiscollectedinthebagfilter.Theremainingparticlecontentinthefluegasesislessthan50mg/Nm3.Fromthebagfilterashhoppers,theashisconveyedtoaflyashcontainer.Boththebottomandflyashesarebeingreusedasorganicfertilisers.Thehotfluegasesareledtothehangingplatensuperheatersinsidetheboilerandthentothesecondpass,wherethefeedwatereconomizerandcombustionairpreheatersarelocated.Economizerandairpreheatingareusedtocoolthefluegasesdowntoapproximately130ºCbeforereleasingthemthroughthestackintotheatmosphere.SuperheatersThenewstrawfiredhangingplatensuperheatersincreasethesteamtemperatureupto540ºCdirectlywiththestrawcombustiongasesinsidetheboiler.Duetotherapidhightemperaturecorrosioncausedbythealkalinecontentsofthestrawash,thesuperheatershavebeencarefullydesigned,usingresistantmaterials,anexactdesignincludingtheappropriateadditionalsurfaceareaforheatexchange,andcompletelyeliminatingtheuseofnaturalgasorotherfuelsforsuperheatingthesteam.AresearchprojectwiththePublicUniversityofNavarraisalsoundergoing,aimingatanalysingnewmaterialsforthesesuperheaters.SteamcycleThepowerplantprocessisdesignedforhighelectricalefficiency.Thisisaccomplishedbyusingthecondensateandfeedwaterpreheating,internalcogeneration.Thehighpressureandtemperaturesteam100bar,540ºCisfedfromtheboilertotheextractioncondensingsteamturbine.Steamisextractedfromthesteamturbineforpreheatinginfouruncontrolledextractions.Theexhauststeamfromtheturbineiscondensedinacondenserusingriverwaterascoolingmedium.Fromthecondenserthecondensateisreturnedthroughthepreheatingstagestothefeedwatertankandfurthertotheboilerforsteamgeneration.Figure1ProcessdiagramTurbineGeneratorThesteamturbineisofextractioncondensingtype.Ithasacapacityof30MWattheterminalsofthealternator.Withanauxiliarypowerconsumptionofnearly2.5MW,theaveragenetelectricaloutputis25MW.Thealternatoroutputvoltageis10kV.Theplantisconnectedtothe66kVgridthroughablocktransformer.Separateauxiliarytransformersareusedtofeedtheauxiliarypowerforplantsownpowerconsumption.4.PerformanceoftheplantBeforestartingtheplantoperation,strawcollectionandstorageinthefieldstartedinsummer2000.Campaignsofyears2001and2002wereusedtofinetuningthelogisticsactivitiesandincreasingtheamountofstoredstraw.Theplantfirstconnectiontothegridwasachievedon25thJune2002,whichmeantthestartofthecommissioningandmonitoringphase.Sincethen,severaltestsandadjustmentshavebeenmade,includingthegradualpowerincreaseuntilfullloadwasreachedatthebeginningof2003.InJuly2003theplantisstilladjustingitsproductionparameters,andfullcommercialoperationwillstartaftersummer.DuringthefirstwholeyearofoperationattestinglevelfromJune2002toMay2003,theplanthasconsumedanamountequivalentto99124tonsofstrawwith11ofmoisture,andthecorrespondingelectricitysuppliedattheutilitysubstationhasbeen118.94GWh.Theefficiencywillbeimprovedto200GWh/awith160000tonsofstrawoncecommercialoperationwillbereached.Theproposedrenewableenergyprojecthasaclearlypositiveimpactontheenvironmentintheregion,asitreplaceselectricitywhichwouldotherwisebeproducedwithfossilfuels,anditdoesnotaddthecurrentemissionsofstrawcombustion,becausethestrawisoftenburnedonthefields.Onthecontrary,becauseofthecontrolledcombustionandfluegascleaning,theCOandparticleemissionsfromthepowerplantareclearlylower.Itiscalculatedthatwiththebiomassfiredpowerplantof25MW,some210000tons/yearofCO2and4600tonsofSO2emissionareavoidedincomparisontopowerproductionwithcoal.5.EconomicPerformanceTheoperationalcostconsistsofthefuelsupplycostsandtheoperationmaintenancecostsoftheplant.Costofstrawsupplyisaround36€/t,includingeverylogisticactivityuntilfuelreachestheplant.Astheannualconsumptionis160000tons,fuelsupplycostsarearound5760000€/year.Ontheotherhand,theordinaryOMcostsareestimatedaround12€/MWh,plusotherfinancial,amortization,sparepartsandextraordinarycosts.Theexpectedincomesoftheplantwilldependontherateforelectricitysupplytothegridbybiomassmeans,whichisannuallyrevised.Asanaverage,theutilitypurchasestheelectricityatarateof65€/MWh,sothattheannualelectricitysaleswillbearound13million€.Asfinancialsources,theEuropeanCommissionhascontributedwith3million€,andtheSpanishInstitutoparalaDiversificaciónyAhorrodelaEnergíaIDAEhasfinancedanother2.4million€,plusashareof10ofthetotalinvestment.Takingthesecontributionsintoaccount,aswellasthepreviousperformancedata,thepaybackperiodisestimatedtobearound15years.Concerningjobcreation,thecontinuousoperationofthepowerplantcreates24newpermanentjobsatthepowerplantandapproximately80jobsmoreingathering,processingandtransportofthefuel,andothervariousactivities.Also,duringtheconstructionperiodtherewasanaverageof200peopleworkingonsiteduring18months.6.ProjectIdentifiersProjectBM/12/97OwnerEHNCorporaciónEnergíaHidroeléctricadeNavarra,S.AYanguasyMiranda,1–5ºE31002PamplonaSPAINTel34948229422Fax34948222970www.ehn.esContractorsFLSMILJØA/S,POWERTECHNICSCONSULTINGENGINEERSOY,IDAEInstitutoparalaDiversificaciónyAhorrodelaEnergíaTechnologyFLSboilerandstrawhandlingAlstomABBturbinepowergeneratorgroupAbengoamanageroftheplantengineeringandconstructionTotalCost51000000€ECSupport3000000€

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