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DEVELOPMENT AND VERIFICATION OF A TWO-STEP THERMOCHEMICAL PROCESS FOR SOLAR HYDROGEN PRODUCTION FROM WATER

Roeb, Martin and Säck, Jan-Peter and Rietbrock, Peter-Michael and Neises, Martina and Ebert, Miriam and Reinalter, Wolfgang and Schmitz, Mark and Sattler, Christian and Lorentzou, Suzanna and Pagkoura, Chrysoula and Zygogianni, Alexandra and Agrafiotis, Christos and Konstandopoulos, Athanasios G. and Stobbe, Per and Jones, Debra and Steele, Andrew and Lopez, Antonio and Romero, Manuel (2008) DEVELOPMENT AND VERIFICATION OF A TWO-STEP THERMOCHEMICAL PROCESS FOR SOLAR HYDROGEN PRODUCTION FROM WATER. In: 14th SolarPACES Biannual Symposium (CD-550), 42709_5b_1. 14th Biannual SolarPACES Symposium, 2008-03-04 - 2008-03-07, Las Vegas, NV (USA).

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Abstract

A two-step thermo-chemical cycle process for solar hydrogen production from water has been developed. By using mixed iron-oxide-based redox systems at moderate temperatures the cycle offers promising properties concerning thermodynamics and efficiency and affords pure hydrogen without any need for product separation and without any environmentally critical emissions. The two steps are performed alternately at different temperatures. Therefore it was necessary to create a process and related hardware to enable a quasi-continuous production of hydrogen. The process was tested with a developed model reactor in a mini plant in the DLR solar furnace. A quasi-continuous, multi-cycling solar hydrogen production with a constant amount of hydrogen produced in the cycles has been successfully demonstrated over several hours of operation. The model reactor is applied to develop a basis for the continuous production of hydrogen in larger scale. The major tasks of the project include the enhancement of yield and long-term stability of the redox system, the development and refinement of an operational strategy and finally the design and development of a 100 kWth pilot reactor to demonstrate the feasibility of the process on top of a solar tower under real conditions.

Document Type:Conference or Workshop Item (Speech)
Title:DEVELOPMENT AND VERIFICATION OF A TWO-STEP THERMOCHEMICAL PROCESS FOR SOLAR HYDROGEN PRODUCTION FROM WATER
Authors:
AuthorsInstitution or Email of Authors
Roeb, MartinUNSPECIFIED
Säck, Jan-PeterUNSPECIFIED
Rietbrock, Peter-MichaelUNSPECIFIED
Neises, MartinaUNSPECIFIED
Ebert, MiriamUNSPECIFIED
Reinalter, WolfgangUNSPECIFIED
Schmitz, MarkUNSPECIFIED
Sattler, ChristianUNSPECIFIED
Lorentzou, SuzannaAPTL, CERTH-CPERI
Pagkoura, ChrysoulaAPTL, CERTH-CPERI
Zygogianni, AlexandraAPTL, CERTH-CPERI
Agrafiotis, ChristosAPTL, CERTH-CPERI
Konstandopoulos, Athanasios G.APTL, CERTH-CPERI
Stobbe, PerStobbe Tech Ceramics
Jones, DebraJohnson-Matthey Technology Centre
Steele, AndrewJohnson-Matthey Technology Centre
Lopez, AntonioCIEMAT
Romero, ManuelCIEMAT
Date:4 March 2008
Journal or Publication Title:14th SolarPACES Biannual Symposium
Refereed publication:Yes
In ISI Web of Science:No
Page Range:42709_5b_1
Editors:
EditorsEmail
Mancini, ThomasUNSPECIFIED
Status:Published
Keywords:hydrogen, thermochemical cycle, ferrite, pilot plant
Event Title:14th Biannual SolarPACES Symposium
Event Location:Las Vegas, NV (USA)
Event Type:international Conference
Event Dates:2008-03-04 - 2008-03-07
Organizer:SolarPACES
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solare Stoffumwandlung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Technical Thermodynamics > Solar Research
Deposited By: Dr.rer.nat. Christian Sattler
Deposited On:19 Sep 2008
Last Modified:12 Dec 2013 20:32

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