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COMBINED STORAGE SYSTEM DEVELOPMENTS FOR DIRECT STEAM GENERATION IN SOLAR THERMAL POWER PLANTS

Laing, Doerte und Bahl, Carsten und Fiß, Michael und Hempel, Matthias und Bauer, Thomas und Meyer-Grünefeldt, Mirko und Eickhoff, Martin (2011) COMBINED STORAGE SYSTEM DEVELOPMENTS FOR DIRECT STEAM GENERATION IN SOLAR THERMAL POWER PLANTS. ISES solar world congress 2011, 28. Aug. - 02. Sept. 2011, Kassel, Deutschland.

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Kurzfassung

For future parabolic trough plants direct steam generation in the absorber pipes is a promising option for reducing the costs of solar thermal energy. These new solar thermal power plants require innovative storage concepts, where the two phase heat transfer fluid poses a major challenge. A three-part storage system is proposed for the two phase fluid water/steam. Concrete storage is used for the process steps involving transfer of sensible heat – i.e. preheating of water and superheating of steam - while for the two-phase evaporation a phase change material (PCM) storage will be deployed. This technology is currently being tested by DLR and Ed. Züblin AG within the project ITES, funded partly by the German Ministry for the Environment, Nature Conservation and Nuclear Safety. A combined storage solution with a 22 m³ concrete storage test module for superheating of steam and a 8.5 m³ PCM-storage for evaporation of water was build in 2009 in a direct steam test loop, set up at the power plant Litoral of Endesa in Carboneras, Spain. This high temperature storage system has a total capacity of ca. 1000 kWh and is the first demonstration of such a combined storage system for the two phase heat transfer fluid water/steam, details were reported in [Laing et al., 2009]. Cycle testing has started end of 2010. First, cycling tests for each storage unit separately have been performed successfully, showing the expected discharge capacities of ca. 250 kWh for the concrete unit and ca. 720 kWh for the PCM-storage module. System operation in constant pressure mode and sliding pressure mode has been conducted for the PCM-storage. While in the constant pressure mode the peak power of the storage of more than 700 kW could be demonstrated, in the sliding pressure mode a constant power output over almost the whole charge and discharge period could be provided. Combined system operation was also proven in constant pressure and sliding pressure mode, showing good system operability. The paper will describe the storage system and present the test results and evaluation of the single module testing as well as on the combined storage system testing in different operation modes.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:COMBINED STORAGE SYSTEM DEVELOPMENTS FOR DIRECT STEAM GENERATION IN SOLAR THERMAL POWER PLANTS
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Laing, Doertedoerte.laing@dlr.de
Bahl, Carstencarsten.bahl@zueblin.de
Fiß, Michaelmichael.fiss@dlr.de
Hempel, Matthiasmatthias.hempel@dlr.de
Bauer, Thomasthomas.bauer@dlr.de
Meyer-Grünefeldt, Mirkomirko.meyer-gruenefeldt@dlr.de
Eickhoff, Martinmartin.eickhoff@dlr.de
Datum:August 2011
Referierte Publikation:Ja
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Thermal energy storage, Phase change material, latent heat, concrete storage, direct steam generation, concentrated solar power
Veranstaltungstitel:ISES solar world congress 2011
Veranstaltungsort:Kassel, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:28. Aug. - 02. Sept. 2011
Veranstalter :ISES International Solar Energy Society
HGF - Forschungsbereich:Energie
HGF - Programm:Rationelle Energieumwandlung (alt)
HGF - Programmthema:E EV - Energieverfahrenstechnik (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E EV - Energieverfahrenstechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Thermochemische Prozesse (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Thermische Prozesstechnik
Hinterlegt von: Dörte Laing
Hinterlegt am:08 Dez 2011 10:01
Letzte Änderung:01 Feb 2012 10:08

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