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Solar-heated rotary kiln for thermochemical energy storage

Neises, Martina and Tescari, Stefania and de Oliveira, Lamark and Roeb, Martin and Sattler, Christian and Wong, Bunsen (2012) Solar-heated rotary kiln for thermochemical energy storage. Solar Energy, 86, pp. 3040-3048. Elsevier. DOI: 10.1016/j.solener.2012.07.012

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Abstract

Thermal energy storage (TES) will improve the efficiency and output of solar power plants. TES based on thermochemical cycles is an interesting option as thermochemical cycles can provide high energy storage densities and allow longer heat storage time. The use of multivalent solid oxide reduction–oxidation (REDOX) reactions for thermochemical heat storage is a promising option. Several concepts are feasible for coupling solar energy to the redox reaction. Among those a directly irradiated rotary kiln is one of the most interesting because it is able to provide high mass flow rates and high amounts of active material. A solar-heated rotary kiln was set-up and operated in the solar furnace of DLR for thermal reduction and oxidation of cobalt oxide. The redox material was fed into the reactor batch wise and reduced on-sun at temperatures of about 900 °C and re-oxidized off-sun in the same rotary kiln. Both steps were carried out in an air atmosphere. Thirty cycles were performed with one batch showing no evident degradation of the material. The results confirm that the rotary kiln is a feasible reactor set-up for the solar reduction of metal oxides and, hence, for thermochemical energy storage.

Item URL in elib:https://elib.dlr.de/77762/
Document Type:Article
Title:Solar-heated rotary kiln for thermochemical energy storage
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Neises, MartinaUNSPECIFIEDUNSPECIFIED
Tescari, StefaniaUNSPECIFIEDUNSPECIFIED
de Oliveira, LamarkUNSPECIFIEDUNSPECIFIED
Roeb, MartinUNSPECIFIEDUNSPECIFIED
Sattler, ChristianUNSPECIFIEDUNSPECIFIED
Wong, BunsenUNSPECIFIEDUNSPECIFIED
Date:2012
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:86
DOI :10.1016/j.solener.2012.07.012
Page Range:pp. 3040-3048
Publisher:Elsevier
Status:Published
Keywords:Thermal energy storage; Solar power plants; Thermochemical cycle; Rotary kiln
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 Verfahrenstechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Roeb, Dr.rer.nat. Martin
Deposited On:20 Nov 2012 17:17
Last Modified:10 Jan 2019 15:50

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