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Thermochemical solar energy storage via redox oxides: materials and reactor/heat exchanger concepts

Tescari, Stefania and Agrafiotis, Christos and Breuer, Stefan and de Oliveira, Lamark and Neises-von Puttkamer, Martina and Roeb, Martin and Sattler, Christian (2014) Thermochemical solar energy storage via redox oxides: materials and reactor/heat exchanger concepts. Energy Procedia, 49, pp. 1034-1043. Elsevier. DOI: 10.1016/j.egypro.2014.03.111. ISSN 1876-6102.

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Abstract

Thermochemical Storage of solar heat exploits the heat effects of reversible chemical reactions for the storage of solar energy. Among the possible reversible gas-solid chemical reactions, the utilization of a pair of redox reactions of multivalent solid oxides can be directly coupled to CSP plants employing air as the heat transfer fluid bypassing the need for a separate heat exchanger. The present work concerns the development of thermochemical storage systems based on such oxide-based redox materials and in particular on cobalt oxide; in the one hand by tailoring their heat storage/release capability and on the other hand via their incorporation in proper reactor/heat exchanger devices. In this respect the first stage of the work involved parametric testing of cobalt oxide compositions via Thermo-Gravimetric Analysis to comparatively investigate the temperature range for cyclic oxidation-reduction and optimize the cycle conditions for maximum reduction and re-oxidation extent. Subsequently, two reactor concepts for the coupling of solar energy to the redox reactions have been implemented and tested. These reactor concepts include in one hand structured ceramic reactors/heat exchangers based on redox-oxide-coated honeycombs and on the other hand powder-fed, solar-heated, rotary kiln reactors. The two reactor concepts were tested within non-solar-aided lab-scale and solar aided campaigns, respectively. The feasibility of both concepts was shown and good chemical conversions were achieved. The experiments pointed out the challenging points related to the manufacture of pilot-scale reactors/heat exchangers with enhanced heat storage capacity. A numerical model using commercial CFD software is developed to define optimal geometrical characteristics and operating conditions and refine the pilot scale design in order to achieve efficient, long-term off-sun operation.

Document Type:Article
Title:Thermochemical solar energy storage via redox oxides: materials and reactor/heat exchanger concepts
Authors:
AuthorsInstitution or Email of Authors
Tescari, Stefaniastefania.tescari@dlr.de
Agrafiotis, Christoschristos.agrafiotis@dlr.de
Breuer, Stefanstefan.breuer@dlr.de
de Oliveira, Lamarklamark.de-oliveira@dlr.de
Neises-von Puttkamer, Martinamartina.neises@dlr.de
Roeb, MartinMartin.roeb@dlr.de
Sattler, Christianchristian.sattler@dlr
Date:1 June 2014
Journal or Publication Title:Energy Procedia
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:49
DOI:10.1016/j.egypro.2014.03.111
Page Range:pp. 1034-1043
Publisher:Elsevier
ISSN:1876-6102
Status:Published
Keywords:thermochemical storage; solar;
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solare Verfahrenstechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Dr.rer.nat. Christian Sattler
Deposited On:07 Aug 2014 15:50
Last Modified:07 Aug 2014 15:50

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