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US 2013/0098037A1 Apr.25,2013 anexpansiondevicedisposedWithinthehousingandbeing con?gured to expand a Working ?uid to rotate the expanderrotorandtherebydrivethegeneratorrotor; a generator disposed Within the housing, axially-spaced fromtheexpansiondeviceandpartiallysupportedbythe generatorrotor; anextractionline?uidlycoupledtoanintermediateexpan sion stage of the expansion device and con?gured to extractWorking?uidtherefrom; a ?rst ?uid line ?uidly coupling the extraction line to the housingandbeingcon?guredtointroducea?rstportion of extracted Working ?uid into the housing to cool the generatorandtheradialbearings;and asecond?uidline?uidlycouplingtheextractionlinetothe chamber and being con?gured to introduce a second portion of extracted Working ?uid into the chamber to minimiZeunequalaxialthrustloads. 2. The rotating machine of claim 1, Wherein the housing comprises an expander casing for housing the expansion device and a generator casing for housing the generator, the expandercasingbeingcoupledtothegeneratorcasing. 3. The rotating machine of claim 2, further comprising a radialsealdisposedaboutthegeneratorrotorandcon?gured to isolate the generator casing from an intermediate chamber de?nedintheexpandercasing. 4. The rotating machine of claim 3, further comprising a balanceline?uidlycoupledtotheintermediatechamberand an exhaust duct de?ned in the expansion device adjacent an outletoftheexpansiondevice. 5. The rotating machine of claim 1, Wherein the expander rotor and the generator rotor are coupled together With a couplingarrangedWithinthechamberoftheexpanderrotor. 6. The rotating machine of claim 1, further comprising a thrustbalancesealarrangedatleastpartiallyWithinthecham ber and de?ning a conduit that ?uidly communicates the second ?uid line With the chamber. 7. The rotating machine of claim 1, further comprising a heatexchanger?uidlycoupledtothe?rst?uidlineandcon ?gured to cool and/or condition the extracted Working ?uid beforebeingintroducedintothehousing. 8. The rotating machine of claim 7, further comprising a valvearrangedinthesecond?uidlineandadjustabletodivert thesecondportionoftheextractedWorking?uidthroughthe heatexchangerandtherebyprovideacooledWorking?uidto thechamber. 9. The rotating machine of claim 1, further comprising a thermalisolationchamberde?nedinthehousingbetWeenthe expansiondeviceandthegenerator. 10. The rotating machine of claim 1, Wherein the Working ?uidcomprisescarbondioxide. 11.A methodforoperatingarotatingmachine,compris ing: expandingaWorking?uidinanexpansiondevicedisposed Within a hermetically-sealed housing, the expansion devicebeingcon?guredtorotateanexpanderrotorhav ing a holloW shaft de?ning a chamber therein; drivingageneratorrotorWiththeexpanderrotor,thegen eratorrotorbeing supportedby one ormore radialbear ings and at least partially supporting a generator dis posed Within the housing and axially-spaced from the expansiondevice; extracting Working ?uid from an intermediate expansion stagearrangedWithintheexpansion; introducing a ?rst portion of extracted Working ?uid into thehousingtocoolthegeneratorandtheradialbearings; and introducing a second portion of extracted Working ?uid intothechambertominimizeunequalaxialthrustloads. 12.Themethodofclaim11,furthercomprisingexhausting the ?rst portion of extracted Working ?uid through a radial seal and into an intermediate chamber de?ned in the housing betWeen the expansion device and the generator, the radial sealbeingdisposedaboutthegeneratorrotor. 13.Themethodofclaim12,furthercomprisingbalancing thepressureintheintermediatechamberWithanexhaustduct de?ned in the expansion device adjacent an outlet of the expansiondevice,theintermediatechamberandtheexhaust ductbeing?uidlycoupledviaabalanceline. 14.Themethodofclaim11,furthercomprisingcoolingthe ?rst portion of extracted Working ?uid in a heat exchanger priortobeingintroducedintothehousing. 15. The method of claim 14, further comprising: coolingthesecondportionofextractedWorking?uidinthe heatexchanger;and providingacooledWorking?uidtothechambertocoolthe expanderrotor. 16.Themethodofclaim11,furthercomprisingthermally isolating the expansion device from the generator With a thermalisolationchamberde?nedinthehousingbetWeenthe expansiondeviceandthegenerator. 17.A rotatingmachine,comprising: anexpandercasingcoupledtoageneratorcasingtoforma hermetically-sealedhousing,theexpandercasinghav ing an expansion device disposed therein and the gen eratorcasinghavingageneratordisposedtherein; a holloW expander rotor arranged for rotation Within the expander casing and de?ning a chamber Within the expanderrotor; ageneratorrotorarrangedforrotationWithinthegenerator casing and being supported by one or more radial bear ings,thegeneratorrotorbeingcoupledtotheexpander rotor With a coupling disposed at least partially Within the chamber such that the expander rotor drives the generatorrotor; anextractionline?uidlycoupledtoanintermediateexpan sion stage of the expansion device and con?gured to extractWorking?uidtherefrom; a ?rst ?uid line ?uidly coupled to the extraction line and con?guredtointroducea?rstportionofextractedWork ing?uidintothegeneratorcasingtoregulateatempera ture of the generator and the radial bearings; and asecond?uidline?uidlycoupledtotheextractionlineand con?gured to introduce a second portion of extracted Working ?uid into the chamber. 18.Therotatingmachineofclaim17,furthercomprisinga radialsealdisposedaboutthegeneratorrotorandcon?gured to isolate the generator casing from an intermediate chamber de?nedintheexpandercasing. 19.Therotatingmachineofclaim18,furthercomprisinga balanceline?uidlycoupledtotheintermediatechamberand an exhaust duct de?ned in the expansion device adjacent an outletoftheexpansiondevice. 20.Therotatingmachineofclaim17,furthercomprisinga heatexchanger?uidlycoupledtothe?rst?uidlineandcon ?guredtoconditiontheextractedWorking?uidbeforebeing introducedintothegeneratorcasing. * * * * *PDF Image | ADVANCED SUPERCRITICAL CO2 EXPANDER GENERATOR
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