Solar Thermal Power Plant with Thermal Storage - Ignacio Burgaleta (Torresol Energy)
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Solar Thermal Power Plant with Thermal Storage - Ignacio Burgaleta (Torresol Energy)

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Solar Thermal Power Plant with Thermal Storage - Ignacio Burgaleta (Torresol Energy)

Solar Thermal Power Plant with Thermal Storage - Ignacio Burgaleta (Torresol Energy)

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Solar Thermal Power Plant with Thermal Storage - Ignacio Burgaleta (Torresol Energy) Presentation Transcript

  • 1. 11 June 2013, Madrid© Torresol EnergySOLAR THERMAL POWER PLANT WITH THERMAL STORAGEWORKSHOP ON APPLICATIONS OF SOLAR FORECASTINGJuan Ignacio BurgaletaDirector of Technology
  • 2. © Torresol Energy 211 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGEINDEX1. Torresol Energy2. Molten Salt Storage System3. Advantages of Molten Salt Storage Systems4. Estimation of DNI & Cloud Prediction System5. Solar Thermal Electricity (STE) Plant, PTC Technology6. Dispatchability capacity7. Conclusions
  • 3. © Torresol Energy 311 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE1. Torresol Energy• Engineering, consulting, and systems inte-gration company. Founded in 1956.• Very active in Solar Energy since 2000.– Technology developer: SENERtrough collector system, Sensolsoftware, heliostats, heliostat axis drive mechanisms, molten salttechnology (as storage system and as heat transfer fluid) centraltower receiver… amongst many other innovations.– PSA Tower Prototype– Turn Key Projects: Andasol 1 & 2, in Granada; Extresol 1, 2& 3, in Badajoz; one plant in La Garrovilla (Badajoz); oneplant in Alvarado (Badajoz); and two plants in Navalvillar dePela (Badajoz).60% 40%• 100% “Mubadala DevelopmentCompany” stockholding.• Mubadala Development Company”belongs to the Abu Dhabi Emirate.• Goal: development and commer-cialization of innovative technologiesin renewable, alternative and sus-tainable energies.A STRONG ALLIANCE
  • 4. © Torresol Energy 411 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE1. Torresol EnergyGEMASOLAR(Tower)VALLE 1(PTC)VALLE 2(PTC)
  • 5. © Torresol Energy 511 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE2. Molten Salt Storage System• Solar Thermal Electricity (STE) Plants are the only source of renewable energy that can have along-range thermal storage system.• Thermal storage system allows to store part of the primary energy collected in the solar field tobe used later.50 MWe STE Plant, 3D design of the molten salt storage system
  • 6. © Torresol Energy 611 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE2. Molten Salt Storage SystemSpring/Summer sunny dayOut of focus
  • 7. © Torresol Energy 711 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE2. Molten Salt Storage System• Of the different Thermal Storage Systems, the Molten Salt Storage Systems allows to beused in commercial solar plants.• The salts used in these systems are: 60% Na NO3, 40% K NO3.• The characteristics of these salts are:– Stable fluid at high temperature in liquid phase.– Reduced steam pressure.– Storage to atmospheric pressure.– Density: 1899 kg/m³.– Melting point: 222 ºC.Molten Salt Piping
  • 8. © Torresol Energy 811 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE2. Molten Salt Storage System• The prediction of electric production is function of the prediction of direct normal radiation (DNI).• With the models developed to predict the direct normal radiation and the capacity ofthermal storage, the accuracy of the production prediction 24 hours in advance is 95 %.• The Thermal Storage System is one of the key elements for the future reduction of thegeneration costs.Molten Salt Storage System (Left PTC plant, right Tower Plant)
  • 9. © Torresol Energy 911 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE• It improves energy efficiency.• It reduces the cost per kWh produced.• The turbine operates most of the time at nominal conditions, reducing significantly theturbine operation at partial load.• Due to the storage system, the turbine operation is not immediately affected by acloud or a sudden high speed wind.• It reduces the number of turbine stop and start cycles of the generation system.• The electricity supply to the grid is dispatchable in a safe, predictable andprogrammable way.• It allows to increase the share of renewable energy compensating the problemscaused to the grid by other renewable energy such as photovoltaic and wind.3. Advantages of Molten Salt Storage Systems
  • 10. © Torresol Energy 1011 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGEIS IMPORTANT A DNI (Direct NormaWHY l Irradiation) FORECASTAND CLOUDS PREDICTION?• Predict the energy that it is going to be generated and wheeled into theelectric grid.• Reduce penalty costs due to deviations of energy generation imposed bythe grid operator• Optimize the production - Avoiding the saturation of the molten salt tank,producing during the coldest temperature hours or reducing the numberof the steam turbine shut-downs• Selection of the optimal moment for the daily starting and shutting downof the system.4. Estimation of DNI & Cloud Prediction System
  • 11. © Torresol Energy 1111 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE4. Estimation of DNI & Cloud Prediction System
  • 12. © Torresol Energy 1211 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE4. Estimation of DNI & Cloud Prediction System• Prediction of clouds crossingover the solar field for a time-horizon of 1-2 hours with aresolution of 1 minute.• Hemiespheric camera andMeteosat Second Generationsatellite (MSG) images.• To optimize the amount ofworking hours during a wholeyear.• Help to draining the moltensalts with the last sun rays foreach cloud cover.
  • 13. © Torresol Energy 1311 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE• Piping materials, equipments and components.– Verify corrosion effects• Molten salt pumps.– Long vertical axis– Overhang assembly• Risk of molten salts solidification• Heat tracing in piping and electrical heaters inside the tanks• Thermal losses– Insulation to reduce heat loss– Special foundation– Temperature Lost < 1 °C per day– High efficiency heat exchangers (99,9%)5. Solar Thermal Electricity (STE) Plant, PTC TechnologyMOLTEN SALT STORAGE SYSTEM
  • 14. © Torresol Energy 1411 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC Technology• 50 MWe STE Plant PTC technology and 7 hour thermal storage• Molten salt: 60 % NaNO3, 40 % KNO3• Two Tanks: 14 m height and 38.5 m diameter (cold at 292 C and hot at 386 C• Thermal HTF/molten salt heat exchanger• Thermal storage: 131 MWt• In operation since 2008.
  • 15. © Torresol Energy 1511 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC TechnologySOLARFIELDTURBINESTORAGE262 MWt131 MWt131 MWt 50 MWe131 MWt• 50 MWe STE Plant PTC technology and 7 hour thermal storage
  • 16. © Torresol Energy 1611 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC TechnologyPTC (50 MWe) Flow Diagram
  • 17. © Torresol Energy 1711 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC TechnologyPTC (50 MWe). Daytime Operation
  • 18. © Torresol Energy 1811 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC TechnologyPTC (50 MWe). Daytime operation during cloudy periods
  • 19. © Torresol Energy 1911 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC TechnologyPTC (50 MWe). Nighttime operation
  • 20. © Torresol Energy 2011 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC Technology• Valle 1 & 2 Plants
  • 21. © Torresol Energy 2111 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC TechnologyPower Block Valle 1
  • 22. © Torresol Energy 2211 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC TechnologyMolten Salt Storage System Valle 1
  • 23. © Torresol Energy 2311 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGEHeat Exchangers HTF/Molten Salts. Valle 15. Solar Thermal Electricity (STE) Plant, PTC Technology
  • 24. © Torresol Energy 2411 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC TechnologyThermal energy fromthe solar fieldElectricity productionThermalenergy inthe tankPT plant – Turbine 100 MWe – Without storageParabolic trough plant operation without and with storagePT plant – Turbine 50 MWe – 7.7 hours thermal storage
  • 25. © Torresol Energy 2511 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE5. Solar Thermal Electricity (STE) Plant, PTC Technology• Single Tank design• Prototype at Valle-2• Cost decrease. Simplifies O&MStorage System Evolution
  • 26. © Torresol Energy 2611 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE6. Dispatchability capacityTypical demandcurvein summer daysElectricity production 25-31 July 2011“Information supplied byProtermosolar”August the 14th 10194 MWhSolar Thermal electricity generation in Spain
  • 27. © Torresol Energy 2711 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGECOMPARATIVA MODELO-REALIDAD020040060080010001200Desde 07/ago/2009 06:00 a 08/ago/2009 06:00DNI(W/m2)Energíaeneltanque(MWh)0102030405060Potenciaturbina(MW)PotenciacalderaGN(MW)DNITURBINE POWERSTORAGELEVELPLANT PERFORMANCE6. Dispatchability capacity
  • 28. © Torresol Energy 2811 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE• 50 MWe STE Plant PTC technology and 7 hour thermal storage• Valle 1 Plant6. Dispatchability capacity
  • 29. © Torresol Energy 2911 June 2013, MadridSOLAR THERMAL POWER PLANT WITHTHERMAL STORAGE7. Conclusions• The Thermal Storage System with molten salt currently inoperation allows to the Solar Thermal Electricity Plants (STE) tosupply electricity to the grid in a dispatchable way.• The Thermal Storage System makes the Solar Thermal ElectricityPlants (STE) more competitive.
  • 30. 11 June 2013, Madrid© Torresol EnergyThank you