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A Moving Bed Reactor for Thermochemical Energy Storage Based on Metal Oxides

Preisner, Nicole Carina and Linder, Marc Philipp (2020) A Moving Bed Reactor for Thermochemical Energy Storage Based on Metal Oxides. Energies, pp. 1-20. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/en13051232 ISSN 1996-1073

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Official URL: https://www.mdpi.com/1996-1073/13/5/1232

Abstract

High temperature thermal energy storage enables concentrated solar power plants to provide base load. Thermochemical energy storage is based on reversible gas-solid reactions and brings along the advantage of potential loss-free energy storage in the form of separated reaction products and possible high energy densities. The redox reaction of metal oxides is able to store thermal energy at elevated temperatures with air providing the gaseous reaction partner. However, due to the high temperature level, it is crucial to extract both the inherent sensible and thermochemical energies of the metal oxide particles for enhanced system efficiency. So far, experimental research in the field of thermochemical energy storage focused mainly on solar receivers for continuously charging metal oxides. A continuously operated system of energy storage and solar tower decouples the storage capacity from generated power with metal-oxide particles applied as heat transfer medium and energy storage material. Hence, a heat exchanger based on a countercurrent moving bed concept was developed in a kW-scale. The reactor addresses the combined utilization of the reaction enthalpy of the oxidation and the extraction of thermal energy of a manganese-iron-oxide particle flow. A stationary temperature profile of the bulk was achieved with two distinct temperature sections. The oxidation induced a nearly isothermal section with an overall stable off-gas temperature. The oxidation and heat extraction from the manganese-iron oxide resulted in a total energy density of 569 kJ/kg with a thermochemical share of 21.1 %.

Item URL in elib:https://elib.dlr.de/134427/
Document Type:Article
Title:A Moving Bed Reactor for Thermochemical Energy Storage Based on Metal Oxides
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Preisner, Nicole CarinaNicole.Preisner (at) dlr.dehttps://orcid.org/0000-0003-2460-6907
Linder, Marc PhilippMarc.Linder (at) dlr.deUNSPECIFIED
Date:2020
Journal or Publication Title:Energies
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.3390/en13051232
Page Range:pp. 1-20
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1996-1073
Status:Published
Keywords:moving bed; thermochemical energy storage; metal oxide
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Köln-Porz
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Neumann, Nicole
Deposited On:20 Mar 2020 15:28
Last Modified:14 Dec 2020 10:57

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