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US 2011/0113786 A1 May 19,2011 COMBINED CYCLE POWER PLANT WITH INTEGRATED ORGANIC RANKINE CYCLE DEVICE BACKGROUND OF THE INVENTION [0001] Thesubjectmatterdisclosedhereinrelatestocom bined cycle power plants and, more particularly, to a com binedcyclepowerplanthavinganintegratedOrganicRankin Cycledevice. looporganic?uidsystemintheORC devicetoformheated organicvaporhavingthermodynamicenergy,andconverting the thermodynamic energy in the heated organic vapor to mechanical energy in a turbine operatively coupled to the closedloopsystem. [0006] These and other advantages and features Will become more apparent from the folloWing description taken inconjunctionWiththedraWings. BRIEF DESCRIPTION OF THE DRAWING [0002] InacombinedcyclepoWerplant(CCPP),agas turbinedrivesagenerator,Whichproduceselectricity.Waste heat from the gas turbine is used to generate steam in a heat recovery steam generator (HRSG), Which, in turn, is used to generateadditionalelectricityviaasteamturbine.More spe ci?cally, a combined cycle ischaracteristic ofa poWer pro ducing engine or plant that employs more than one thermo dynamiccycle.Heatengines,suchasgasturbines,areonly [0008] FIG.1isaschematicvieWofacombinedcycle able to use a portion of the energy their fuel generates (usually lessthan50%).Any remainingheat(e.g.hotexhaustfumes) from combustion is generally Wasted. Combining tWo or more “cycles” such as a Brayton cycle (Gas) and a Rankine Cycle (Steam) results in improved output ef?ciency. [0003] AnOrganicRankineCycle(ORC)issimilartothe embodiment;and cycleofaconventionalsteamturbine,exceptforthe?uidthat [0010] FIG.3isaschematicvieWofacombinedcycle drivestheturbine.Inplaceofsteam,theORC employsahigh molecular mass organic ?uid. Some ofthe chemicals used in ORC’s areFreon,butane,propane,ammonia, asWellasmany neW environmentally friendly refrigerants. The selected Working ?uids alloW system designers to exploit loW tem peratureheatsourcestoproduceelectricityinaWiderangeof ofexampleWithreferencetothedraWings. poWeroutputs(fromfeWkWupto3MW electricpoWerper unit).Forthatreason,ORC’s ?ndWideuseingeothermicheat pump systems.InatypicalORC theorganicWorking?uidis vaporiZed by application of the heat source in an evaporator (ORC-EVA). The organic ?uid vapor expands in a turbine (ORC-TUR) andthencondensedusinga?oW ofWaterina condenser (ORC-CON) (alternatively, ambient air can be used forcooling). The condensed ?uid ispumped back tothe evaporatorthusclosingthethermodynamiccycle. BRIEF DESCRIPTION OF THE INVENTION [0004] Accordingtooneaspectoftheexemplaryembodi ment, a combined cycle poWer plant includes a gas turboma chine having a compressor portion and a turbine portion, a heat recovery steam generator (HRSG) operatively coupled totheturbineportionofthegasturbomachine,andanorganic Rankine cycle (ORC) device ?uidly coupled to the HRSG. TheORC deviceincludesanorganic?uidpassingthrougha closed loop system operatively coupled to a turbine. Heated ?uidfromtheHRSG elevatesatemperatureoftheorganic ?uid?oWingthroughtheclosedloopsystem.Thermalenergy from the organic ?uid is converted to mechanical energy in theturbine. DETAILED DESCRIPTION OF THE INVENTION [0012] WithreferenceFIG.1,thecombinedcyclepoWer plant constructed in accordance With an exemplary embodi ment is indicated generally at 2. PoWer plant 2 includes a gas turbomachine 4 operatively linked to a heat recovery steam generator (HRSG) 6. Gas turbomachine 4 includes a com pressor portion 10 linked to a turbine portion 12 via a com bustorportion14.HRSG 6includesahighpressure(HP) portion 19, and intermediate (IP) portion 20 and a loW pres sure(LP)portion21havingaloWpressuredrum22.HRSG 6 isalsoshoWntoincludeaneconomiZer23operativelylinked toLP portion21.EconomiZer23 is?uidlyconnectedtoafeed pump 26thatsuppliesheated?uidtoHRSG 6.EconomiZer 23, in accordance With an exemplary embodiment, includes a ?rst economiZer portion 26 ?uidly linked to a second econo miZer portion 28 via a ?rstjunction point 31. Second econo miZer portion 28 is linked to loW pressure drum 22 via a second junction point 33. In further accordance With the exemplaryembodimentshoWn,combinedcyclepoWerplant 2 includes an organic ranking cycle (ORC) device 40. [0013] In accordance With an exemplary embodiment, organic Rankine cycle device 40 includes a ?rst ?uid system 45 that is arranged in a heat exchange relationship With a second, closed loop, ?uid system 48. First ?uid system 45 includes a supply conduit 58 that is operatively linked [0005] According to another aspect of the exemplary embodiment, a method of operating a combined cycle poWer plantincludesoperatingagasturbomachineincludingacom pressorportionandaturbineportion,passinghotgasesfrom betWeensecondjunctionpoint33andanevaporator60thatis theturbineportionthroughaheatrecoverysteamgenerator (HRSG),transferringheatfromthehotgasestoa?uidpass ingthroughtheHRSG toformheated?uid,passingthe heated ?uid to an organic Rankine Cycle (ORC) device hav ingaclosedlooporganic?uidsystem,transferringheatfrom the heated ?uid to organic ?uid ?oWing through the closed integratedWithsecond?uidsystem48.A returnconduit62 passesfromevaporator60,throughapump 65,andbackto ?rstjunctionpoint31.AsWillbediscussedmorefullybeloW, ?uid passing through ?rst ?uid system 45 is in a heat exchange relationship With an organic ?uid that passes through second ?uid system 48. [0007] Thesubjectmatter,Whichisregardedastheinven tion,isparticularlypointedoutanddistinctlyclaimedinthe claims at the conclusion of the speci?cation. The foregoing andotherfeatures,andadvantagesoftheinventionareappar entfromthefolloWingdetaileddescriptiontakeninconjunc tion With the accompanying draWings in Which: poWer plant including an integrated organic Rankine cycle device inaccordance With an exemplary embodiment; [0009] FIG. 2 is a schematic vieW of a combined cycle poWer plant including an integrated organic Rankine cycle device in accordance With another aspect of the exemplary poWerplantincludinganintegratedorganicRankinecycle deviceinaccordanceWithyetanotheraspectoftheexemplary embodiment. [0011] Thedetaileddescriptionexplainsembodimentsof the invention, together With advantages and features, by WayPDF Image | COMBINED CYCLE POWER PLANT WITH INTEGRATED ORC
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