Optimising performance of integrated solar combined-cycle power … · 2019. 2. 1. · integrated...
Transcript of Optimising performance of integrated solar combined-cycle power … · 2019. 2. 1. · integrated...
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Optimisingperformanceofintegratedsolarcombined-cyclepowerplantsProvidingexpertdesignandanalysisservicestoproponentsoroperatorsofintegratedsolarcombined-cyclepowerplants
Challenges
Proponentsandoperatorsofsolarintegratedplantsfacecomplexchallengesindeterminingandoptimisingtheperformanceoftheirplants.Location,time-of-day,weatheranddesignofthesolarcollectorsystemhaveanimpactonplantperformance.
Asolarplant’seffectivenessinimprovingaconventionalpowerplant’sefficiencyalsodependsonhowthetwoplantsareconnected.Supplyingsolar-heatedsteamatlowtemperatureswillachieveverylittleincreaseinoutput.Supplyingsteamathighertemperatures,whilemoreeffective,canreducethesolarcollector’sefficiencyandincreaseitscost.Thechallengeisdeterminingtheuniqueoptimumarrangementforaparticularinstallation.
Solutions
HRL'sProcessDesignTeamprovidesexpertdesignservicestothoseproposingnewintegratedsolarthermalpowerplants.Theteamalsoprovidesexpertanalyticalservicestooperatorsofintegratedsolarplant.TheteamdrawsonmanyyearsofexperienceinusingtheThermoflowsuiteofsoftwaretodesignandanalyseconventionalandgasturbinecombinedcyclepowerplants.Theseskillscanalsobedrawnontomodelpowerplantsthatincludesolarthermalcollectorsystems.
TheThermoflowprogramstheHRLteamusesinitsexpertdesignandmodelledservicesforconventionalandgasturbinecombined-cyclepowerplantsincludeSteamPro,SteamMaster,GTProandGTMaster.SuchdesignscanbeimportedintoaThermoFlexmodelcontainingsolarcollectorandthermalstoragemodels.Withinthemodellingsoftware,solardevicescanbeconnectedtoapowerplantmodelandtodetermineoverallperformanceunderawiderangeofconditions.Ifrequired,modelscanbedesignedusingonlyThermoflex.
Afieldofparabolictroughsolarcollectors
Benefits
Inprovidingclientswithexpertdesignandanalysisservices–forassessingconventionalandgasturbineplantswith,orwithout,solarcollectors–HRLTechnologyGroup’sProcessDesignTeamprovidesnumerousbenefitsincluding:• expertservicesfromexperiencedpersonnel• fastdesignandanalysisservices• accurate,authoritativeandindependentdesignand
analysisservices• plantoperationresultsthatcanbecombinedwithEEO
(EnergyEfficiencyOpportunitiesprogram)andgreenhousecreditsassessmenttoproduceaccuratefinancialmodelling
• quickevaluationoftheimpactofaddingsolarcollectorsystemstopowerplants
• assessingplantperformanceusingbiomassfuels.
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Modellingagasturbinecombinedcycleplantcoupledtoasolarthermalsteamgeneratorcapableofproducingpartiallysuperheatedhighpressuresteam
Theparabolictroughsolar-fieldheatsathermaloilwhichispumpedthroughaseriesshellandtubeheatexchangerswhichpreheatfeedwater,generatesteam,andsuperheatsteam.Thethermaloiltemperaturesarelimitedtoabout400°Ctherebyrequiringfinalsuperheatingofthesteamintheheatrecoverysteamgenerator(HRSG).ThesolargeneratorreceivespartiallypreheatedfeedwaterfromtheHRSG,andreturnssuperheatedsteamwhichismixedwithhighpressure(HP)steamexitingthefirstsuperheater(HPS0).Themixtureissuperheatedtofinalsteamturbinethrottleconditionsofapproximately550°C.
Modellingsuggeststhesolarfieldcancontributeapproximately6.5percentoftotalplantpoweraddingsome3.9percentagepointstoplantefficiency.Themodestimprovementscomewithlittleimpactonthecombinedcycleoperation.Solarsystemsmakingagreatercontributionaddcomplexitytoplantdesignandtoplantoperationinnon-solarmode.Inadditiontocalculatingplantperformance,themodellingalsoprovidesanestimateofplantcost.
Modellingasolarcollectorwiththermalstorageintegratedwithaconventionalsteamplant
Afieldofparabolictroughsolarcollectorsisusedtoheatthermaloilwhichisthenstoredinathermallystratifiedtank.A‘solarboiler’generatessteambycoolingthermaloil,drawnfromthestoragetank,inaseriesoftubeandshellheatexchangers.ThesteamfeedsaRankinecyclepowerplant.
Thetank’sperformanceismodelledusingsourcesandsinks.Thesolarfieldisfedfromasourceat295°Crepresentingthecoldbottomofthetank.Heatedoilfromthesolarfieldisfedintoasinkformedinthetopofthetank.Hotliquidforthesteamgeneratorisdrawnfromthetopofthetankandcoolthermaloilisreturnedtothebottomofthetank.
Themodel,inconjunctionwithanE-LINKworkbook,isusedtoanalysesystemoperationoverdailycyclesthroughouttheyear.Themodellingalsoprovesanestimateofthecosttoconstructtheplant.
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