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US 7,685,820B2 56 perature of at least approximately 10650 F., Box 104. As showninBox 106,theheatedmoltensaltisthensenttohot storage tank 24 until it is needed by supercritical carbon dioxide system 14. The heated molten salt is pumped to supercritical carbon dioxide system 14, Where the thermal energy from the molten salt is transferred to the supercritical carbon dioxide to poWer supercritical carbon dioxide system 14,Box 108. The turbine system uses a molten salt solar heating system to provide thermal energy to a supercritical carbon dioxide system. The supercritical carbon dioxide system requires peakcarbondioxidetemperaturesofapproximately10220F. The solarheatingsystempassesmoltensaltasaheattransfer ?uidthroughthesolarheatingsystemtotransportthethermal energyrequiredtopoWertosupercriticalcarbondioxidesys tem.Inanexemplaryembodiment,thesolarheatingsystemis a solar poWer toWer system that heats the molten salt to a temperature of approximately 10650 F. Although the present invention has been described With referencetopreferredembodiments,Workersskilledintheart Will recogniZe that changes may be made in form and detail Without departing from the spirit and scope of the invention. The invention claimed is: 1.A turbinesystemcomprising: a supercritical carbon dioxide turbine having an outlet; a high temperature recuperator having a ?rst inlet con nected to the outlet of the supercritical carbon dioxide turbine and a ?rst outlet; aloWtemperaturerecuperatorhavinga?rstinletconnected tothe?rstoutletofthehightemperaturerecuperatorand a?rstoutlet; a ?rst valve having an inlet, a ?rst outlet and a second outlet, Wherein the ?rst inlet of the ?rst valve is con nectedtothe?rstoutletoftheloWtemperaturerecupera tor; acompressorconnectedtothe?rstoutletofthe?rstvalve; aprecoolerconnectedtothesecondoutletofthe?rstvalve; 20 25 30 35 a loW temperature recuperator that receives the Brayton Working?uidfromthehightemperaturerecuperatorand coolsit; aprecooler; a ?rst valve that divides the Brayton cycle Working ?uid cooled by the loW temperature recuperator into a ?rst portion that ?oWs through the precooler and a second portionthatdoesnot?oW throughtheprecooler; a second valve that combines the ?rst portion of the Bray ton cycle Working ?uid that is cooled by the precooler and the second portion of the Brayton cycle Working ?uid that is not cooled by the precooler; and a solar receiver for heating a heat transfer ?uid to a tem perature of at least about 1065 degrees Fahrenheit, Whereintheheattransfer?uidisincommunicationWith theBraytoncycleWorking?uid. 8. The system of claim 7, Wherein the supercritical carbon dioxideturbineoperatesataninlettemperatureofabout 1022 degreesFahrenheit. 9. The system of claim 7, Wherein the heat transfer ?uid comprisesmoltensalt. 10. The system of claim 9, Wherein the molten salt heat transfer?uidcomprisesbetWeenabout50% sodiumnitrate andabout70% sodiumnitrateandbetWeenabout30% potas siumnitrateandabout50% potassiumnitratebyWeight. 11. The system of claim 9, Wherein the heat transfer ?uid provides thermal energy to the supercritical carbon dioxide turbine. 12. The system of claim 11, and further comprising a heat exchanger,Whereinthethermalenergyistransferredfromthe molten salt to carbon dioxide. 13. The system of claim 7, Wherein the system is a solar heatingsystem. 14.A methodofgeneratingelectricityWithasupercritical carbondioxideturbine,themethodcomprising: capturingsolarenergyfromsunlight; heating a heat transfer ?uid to a temperature of at least about 1065 degrees Fahrenheit With the solar energy; transporting energy from the heat transfer ?uid to heat a BraytoncycleWorking?uidofthesupercriticalcarbon dioxideturbine; passingtheheatedBraytoncycleWorking?uidthroughthe supercriticalcarbondioxideturbine; cooling the Brayton cycle Working ?uid from the super critical carbon dioxide turbine With a high temperature recuperator; cooling the Brayton cycle Working ?uid from the high temperature recuperator With a loW temperature recu perator; dividingthecooledBraytoncycleWorking?uidfromthe loW temperature recuperator into a ?rst portion and a secondportion; coolingthe?rstportionoftheBraytoncycleWorking?uid; notcoolingthesecondportionoftheBraytoncycleWork ing?uid;and combiningthe?rstportionoftheBraytoncycleWorking ?uidandthesecondportionoftheBraytoncycleWork ing?uidthatisnotcooledafterthestepofcoolingthe ?rstportionoftheBraytoncycleWorking?uid. 15. The method of claim 14, Wherein capturing solar energycomprisesusingasolarheatingsystem. 16.Themethodofclaim14,Whereintheheattransfer?uid comprisesmoltensalt. 17. The method of claim 16, Wherein the molten salt heat transfer?uidcomprisesbetWeenabout50% sodiumnitrate andabout70% sodiumnitrateandbetWeenabout30% potas siumnitrateandabout50% potassiumnitratebyWeight. and asolarheatingsystemhavingamoltensaltheattransfer 40 ?uid for providing thermal energy to the supercritical carbon dioxide turbine. 2.Theturbinesystemofclaim1,Whereinthesupercritical carbon dioxide turbine operates at a temperature of at least about 1022 degrees Fahrenheit. 3. The turbine system of claim 1, Wherein the molten salt heat transfer ?uid comprises betWeen about 50% sodium nitrateandabout70% sodiumnitrateandbetWeenabout30% potassiumnitrateandabout50%potassiumnitratebyWeight. 4.Theturbinesystemofclaim1,Whereinthesolarheating system heats the molten salt heat transfer ?uid to a tempera ture of at least about 1065 degrees Fahrenheit. 5.Theturbinesystemofclaim1,Whereinthesupercritical carbondioxideturbinecomprisesasupercriticalcarbondiox 55 ideBraytonpoWerconversioncycle. 6. The turbine system of claim 1, and further comprising a heat exchanger, Wherein the thermal energy is transferred from the molten salt heat transfer ?uid to a carbon dioxide BraytoncycleWorking?uid. 7.A systemforprovidingenergyforasupercriticalcarbon dioxideturbine,thesystemcomprising: a Brayton cycle Working ?uid for providing energy to the supercriticalcarbondioxideturbine; ahightemperaturerecuperatorthatreceivestheBrayton 65 Working?uidfromthesupercriticalcarbondioxidetur bineandcoolsit; 45 50 60PDF Image | SUPERCRITICAL CO2 TURBINE SOLAR POWER
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