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Redox Materials and Related Processes for Solar Thermal Energy Conversion

Roeb, Martin and Bulfin, Brendan and Vieten, Josua and Brendelberger, Stefan and Schmücker, Martin and Sattler, Christian (2017) Redox Materials and Related Processes for Solar Thermal Energy Conversion. 12th Pacific Rim Conference on Ceramic and Glass Technology, 21.-26. Mai 2017, Waikoloa, USA.

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Official URL: http://ceramics.org/meetings/pacrim12

Abstract

Coupling concentrated sunlight to suitable sequences of thermochemical reactions enables the production of fuels by water and CO2 splitting and the thermochemical separation of air. One of the major barriers of those processes is the identification of suitable redox materials exhibiting satisfactory durability, reactivity and efficiencies. Solar thermochemical redox processes utilize metal oxides like ceria or perovskites as reactive intermediates. An analytical thermodynamic model is developed to relate material properties to process performance. Perovskites like SrFe0.95Cu0.05O 3-δ and Ca0.8Sr0.2MnO 3-δ show large gravimetric oxygen storage capacities in air. The experimentally measured re-oxidation reaction of those materials is one order of magnitude faster than with state-of-the-art materials. The use of particulate redox materials enables to decouple the reduction from the oxidation reaction and the absorption of solar radiation from the reaction and a counter current heat exchanger design. A numerical model was developed to analyze the heat losses of a particle conveyor using an insulated container in a cycled operation. The model calculated that temperature losses reach values of about 2-4K per lifting. A detailed model of the heat exchanger calculates the process performance considering temperature dependent material data and other factors. The system reaches a heat recovery rate over 70% in case of six stages, connected in a quasi-counter-current principle.

Item URL in elib:https://elib.dlr.de/117153/
Document Type:Conference or Workshop Item (Speech)
Title:Redox Materials and Related Processes for Solar Thermal Energy Conversion
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Roeb, MartinMartin.Roeb (at) dlr.deUNSPECIFIED
Bulfin, Brendanbrendan.bulfin (at) dlr.deUNSPECIFIED
Vieten, Josuajosua.vieten (at) dlr.deUNSPECIFIED
Brendelberger, StefanStefan.Brendelberger (at) dlr.deUNSPECIFIED
Schmücker, MartinMartin.Schmuecker (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:21 May 2017
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Concentrated solar Radiation, redox materials, thermochemical cycles, thermal energy conversion
Event Title:12th Pacific Rim Conference on Ceramic and Glass Technology
Event Location:Waikoloa, USA
Event Type:international Conference
Event Dates:21.-26. Mai 2017
Organizer:The American Ceramic Society
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Institute of Materials Research > Structural and Functional ceramics
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:18 Dec 2017 11:58
Last Modified:31 Jul 2019 20:14

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