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Operational strategy of a two-step thermochemical process for solar hydrogen production

Roeb, Martin und Neises, Martina und Säck, Jan-Peter und Rietbrock, Peter und Monnerie, Nathalie und Dersch, Jürgen und Schmitz, Mark und Sattler, Christian (2009) Operational strategy of a two-step thermochemical process for solar hydrogen production. International Journal of Hydrogen Energy, 34, Seiten 4537-4545. Elsevier Ltd.. DOI: 10.1016/j.ijhydene.2008.08.049

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A two-step thermochemical cycle process for solar hydrogen production from water has been developed using ferrite-based redox systems at moderate temperatures. The cycle offers promising properties concerning thermodynamics and efficiency and produces pure hydrogen without need for product separation. The process works by cycling stationary ferrite-coated monoliths through sequential oxidation and reduction steps at 1073 and 1473 K, respectively. By using two such monoliths in parallel, it is possible to quasi-continuously produce hydrogen. A prototype solar reactor and peripherals suitable to proof the process concept were developed and have been successfully tested in DLR’s solar furnace in Cologne. Repeated cycling operation is possible with a reproducible amount of hydrogen produced. In most cases, a distinct decay of the amount of the evolved hydrogen is observed from cycle to cycle due to inhomogeneous heating of the monolithic absorber in the very first cycles and due to disappearance of the porosity and the associated loss of surface area in later cycles. Results from experimental campaigns with the prototype reactor and simulations with a corresponding reactor model support the development and verification of a process strategy for the continuous production of hydrogen in a larger scale. The tasks include the enhancement of long-term stability of the redox system, the development 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.

Titel:Operational strategy of a two-step thermochemical process for solar hydrogen production
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID
Roeb, MartinMartin.roeb@dlr.deNICHT SPEZIFIZIERT
Neises, Martinamartina.neises@dlr.deNICHT SPEZIFIZIERT
Säck, Jan-Peterjan-peter.saeck@dlr.deNICHT SPEZIFIZIERT
Rietbrock, Peterpeter.rietbrock@dlr.deNICHT SPEZIFIZIERT
Monnerie, Nathalienathalie.monnerie@dlr.deNICHT SPEZIFIZIERT
Dersch, Jürgenjuergen.dersch@dlr.deNICHT SPEZIFIZIERT
Sattler, Christianchristian.sattler@dlr.deNICHT SPEZIFIZIERT
Erschienen in:International Journal of Hydrogen Energy
Referierte Publikation:Ja
In Open Access:Nein
In ISI Web of Science:Ja
DOI :10.1016/j.ijhydene.2008.08.049
Seitenbereich:Seiten 4537-4545
Verlag:Elsevier Ltd.
Stichwörter:Thermochemical cycle; Ferrites; Solar thermal; Water splitting; Iron oxide
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:E SF - Solarforschung (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SF - Solarforschung
DLR - Teilgebiet (Projekt, Vorhaben):E - Solare Stoffumwandlung (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Technische Thermodynamik > Solarforschung
Hinterlegt von: Sattler, Prof. Dr. Christian
Hinterlegt am:19 Feb 2010 14:05
Letzte Änderung:12 Dez 2013 20:54

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