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Modification of CaO/Ca(OH)2 for Thermochemical Energy Storage

Schäfer, Sandra and Haas, Marie and Görtz, Burkhard and Linder, Marc and Trettin, Reinhard (2014) Modification of CaO/Ca(OH)2 for Thermochemical Energy Storage. In: 6th FEZA Conference. 6th FEZA Conference, 08.-11. Sept. 2014, Leipzig, Deutschland.

Full text not available from this repository.

Abstract

Efficient storage of thermal energy can contribute significantly to a sustainable and cost-effective energy solution. Thermochemical storage, where heat is stored as reaction enthalpy of a reversible chemical reaction, has great potential as an economic option for thermal energy store. This is especially due to the high specific storage densities associated with the chemical reaction. Suitable thermochemical storage materials are characterized by high reaction enthalpies, fast dynamics as well as cycling stability. Furthermore, sufficient heat and mass transfer through the reaction bed and within the particles is crucial. A currently investigated reaction system for application at temperatures between 400 and 600 °C is the CaO/Ca(OH)2 system, where calcium oxide (CaO) reacts in an exothermic reaction with water vapour (H2O) to calcium hydroxide (Ca(OH)2). This system has already been studied in stationary bench- and pilot-scale reactors. In order to improve the storage’s efficiency a moving bed reactor is proposed. However, due to the very fine particle size, the material is a Geldart C powder and therefore difficult to move. The aim of this work is therefore to increase the particle size in order to enable the movement of the storage material without negatively affecting the material properties. To this end, different material modifications such as pelletisation, granulation of the storage material within a matrix and encapsulation with porous materials are conducted. In this contribution, the effects on the reaction behaviour are discussed. Based on important criteria for the thermochemical heat storage such as cycling stability, potential side reactions as well as impacts on the reactivity, a practical approach for further material optimization is derived.

Item URL in elib:https://elib.dlr.de/93479/
Document Type:Conference or Workshop Item (Poster)
Title:Modification of CaO/Ca(OH)2 for Thermochemical Energy Storage
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schäfer, SandraInstitut für Bau- und Werkstoffchemie, Universität SiegenUNSPECIFIED
Haas, Mariemarie.gollsch (at) dlr.deUNSPECIFIED
Görtz, BurkhardInstitut für Bau- und Werkstoffchemie, Universität SiegenUNSPECIFIED
Linder, Marcmarc.linder (at) dlr.deUNSPECIFIED
Trettin, ReinhardInstitut für Bau- und Werkstoffchemie, Universität SiegenUNSPECIFIED
Date:2014
Journal or Publication Title:6th FEZA Conference
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:thermal energy storage, material modification
Event Title:6th FEZA Conference
Event Location:Leipzig, Deutschland
Event Type:international Conference
Event Dates:08.-11. Sept. 2014
Organizer:DECHEMA und Universität Leipzig
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Gollsch, Marie
Deposited On:17 Dec 2014 17:44
Last Modified:17 Dec 2014 17:44

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