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Investigations of nano coated calcium hydroxide cycled in a thermochemical heat storage

Roßkopf, Christian and Afflerbach, Sandra and Schmidt, Matthias and Görtz, Burkhard and Torsten, Kowald and Linder, Marc and Reinhard, Trettin (2015) Investigations of nano coated calcium hydroxide cycled in a thermochemical heat storage. Energy Conversion and Management (97), pp. 94-102. Elsevier. DOI: 10.1016/j.enconman.2015.03.034 ISSN 0196-8904

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Official URL: http://www.sciencedirect.com/science/article/pii/S0196890415002526


Thermochemical heat storage systems are a promising new technology for concentrated solar power plants and can contribute to improve the efficiency of industrial processes Neveu et al. (2013) [21]. However, for example for the reaction system calcium oxide/calcium hydroxide (CaO/Ca(OH)2), the good availability at low cost is accompanied by poor powder properties that demand complex reactor solutions. During thermochemical cycling agglomeration effects occur and originate inhomogeneity resulting in permanent changes of bed characteristics especially related to the heat and mass transport. One approach in order to stabilize the material is to coat the reacting material with nanoparticles in order to minimize attractive forces leading to less agglomeration. But, high temperatures, change of volume and surface configuration, permeance for reaction gas, side reactions and mechanical stresses within the storage represent challenges for nanoparticles. Therefore, in this work, Aerosil® as additive for thermochemical storage is investigated during cycling in an indirect operating pilot-scale thermochemical reactor with regard to side reactions, stability on the surface and various coating configurations. It is shown that the reaction bed properties can be highly improved depending on the modality of the insertion process whereas occurring side reactions lead to a stabilization of the surface structure at the expense of a capacity loss of the thermochemical reactor.

Item URL in elib:https://elib.dlr.de/95813/
Document Type:Article
Title:Investigations of nano coated calcium hydroxide cycled in a thermochemical heat storage
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Roßkopf, Christianchristian.rosskopf (at) googlemail.comUNSPECIFIED
Afflerbach, Sandraafflerbach (at) chemie.uni-siegen.deUNSPECIFIED
Schmidt, Matthiasmatthias.schmidt (at) dlr.deUNSPECIFIED
Görtz, Burkhardgoertz (at) chemie.uni-siegen.deUNSPECIFIED
Torsten, Kowaldkowald (at) chemie.uni-siegen.deUNSPECIFIED
Linder, Marcmarc.linder (at) dlr.deUNSPECIFIED
Reinhard, Trettintrettin (at) chemie.uni-siegen.deUNSPECIFIED
Journal or Publication Title:Energy Conversion and Management
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.enconman.2015.03.034
Page Range:pp. 94-102
Keywords:thermochemical heat storage; calcium hydroxide;nanoparticles; agglomeration; aerosil; rheinhardbrunsite;calcio-chondrodite
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 - Thermische Energiespeicher (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Schmidt, Matthias
Deposited On:15 Apr 2015 13:35
Last Modified:06 Sep 2019 15:20

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