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Oxides and porous structures based on earth-abundant elements for hybrid sensible/thermochemical solar energy storage in air-operated solar thermal power plants

Agrafiotis, Christos and Tescari, Stefania and Roeb, Martin and Sattler, Christian (2017) Oxides and porous structures based on earth-abundant elements for hybrid sensible/thermochemical solar energy storage in air-operated solar thermal power plants. In: AIP Conference Proceedings, 2033 (100001). SolarPACES 2017, 26.-29. Sep. 2017, Santiago, Chile. doi: 10.1063/1.5067122.

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Official URL: https://doi.org/10.1063/1.5067122

Abstract

The concept of regenerative sensible heat storage in porous solids employed in air-operated solar thermal power plants can be hybridized with thermochemical storage by coating/manufacturing entirely the heat exchange modules with oxides of multivalent metals undergoing reduction/oxidation reactions with significant heat effects. A prerequisite for eventual commercialization of such thermochemical storage concepts is the use of low-cost, environmental-friendly, oxide compositions capable of reversible reduction/oxidation under air with high reaction enthalpies. Equally necessary is the shaping of such oxides into structures operating as integrated reactors/heat exchangers. In this perspective, a specific Mn-based mixed oxide system of composition (0.8)(Mn2O3)*(0.2)(Fe2O3) was investigated. The work involved shaping the powder to porous foams and pellets which were comparatively tested in an infrared furnace, to clarify the effect of high heating/cooling rates on redox performance and structure stability. The redox performance of such Mn-rich systems was found sensitive to exposure at high temperatures. As long as a temperature of ~ 1100oC is not exceeded during redox cycling, both powder and pellets seem to operate reversibly for a high number of cycles. However, the high sintering temperatures (1350oC) required to induce strength to high-porosity structures like foams before their use as thermochemical storage media, had an adverse effect on their redox performance.

Item URL in elib:https://elib.dlr.de/117209/
Document Type:Conference or Workshop Item (Speech)
Title:Oxides and porous structures based on earth-abundant elements for hybrid sensible/thermochemical solar energy storage in air-operated solar thermal power plants
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Agrafiotis, ChristosChristos.Agrafiotis (at) dlr.deUNSPECIFIED
Tescari, StefaniaStefania.Tescari (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.Roeb (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:26 September 2017
Journal or Publication Title:AIP Conference Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:2033
DOI :10.1063/1.5067122
Status:Published
Keywords:Oxides, porous structures, heat storage, sensible, thermochemical, concentrated solar radiation
Event Title:SolarPACES 2017
Event Location:Santiago, Chile
Event Type:international Conference
Event Dates:26.-29. Sep. 2017
Organizer:SolarPACES
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:18 Dec 2017 12:02
Last Modified:14 Feb 2020 14:14

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