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Experimental analysis of encapsulated CaO/Ca(OH)2 granules as thermochemical storage in a novel moving bed reactor

Cosquillo Mejia, Aldo and Afflerbach, Sandra and Linder, Marc Philipp and Schmidt, Matthias (2020) Experimental analysis of encapsulated CaO/Ca(OH)2 granules as thermochemical storage in a novel moving bed reactor. Applied Thermal Engineering, 169 (169), p. 114961. Elsevier. DOI: 10.1016/j.applthermaleng.2020.114961 ISSN 1359-4311

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Official URL: http://dx.doi.org/10.1016/j.applthermaleng.2020.114961

Abstract

The advantages of Ca(OH)2 such as low cost and high energy density make it a promising material for thermal energy storage. However, the development of cost efficient large scale storage systems remains challenging. One reason is that the low thermal conductivity and cohesiveness of the powder bulk material impede the reliable operation of moving bed reactors. One approach to address these drawbacks is the macro encapsulation of pregranulated storage material. In this work, a newly moving bed reactor was developed and the performance of two encapsulated storage materials was investigated in lab scale and under application relevant boundary conditions. The two tested material samples were ceramic encapsulated CaO granules (sample 5D1F) and Ca(OH)2 granules coated with Al2O3 nanostructured particles (sample Al2O3). The reaction performance, cycling stability and ability to flow were experimentally examined and the operation of the moving bed reactor was successfully demonstrated. It was found that both encapsulated materials retained their shape after sixfold cycling. After the experiment series, the sample 5D1F flowed freely out of the reactor while the sample Al2O3 clogged the reactor tubes due to the volume expansion during hydration. Further, the experiments revealed that the reaction performance of the sample 5D1F is reduced, while the performance of the sample Al2O3 is comparable to unmodified Ca(OH)2 granules. Overall, this study shows that encapsulated granules are stable under operation in larger reactors and the granules further facilitate the reactor design and operation. Additionally, the volumetric energy density of compacted granules is higher compared to the loose powder bulk. In particular, the encapsulation with Al2O3 nanostructured particles showed promising performance for the cost efficient development of a scalable thermochemical energy storage system and therefore needs to be further investigated

Item URL in elib:https://elib.dlr.de/139630/
Document Type:Article
Title:Experimental analysis of encapsulated CaO/Ca(OH)2 granules as thermochemical storage in a novel moving bed reactor
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Cosquillo Mejia, Aldoaldo.cosquillo (at) dlr.deUNSPECIFIED
Afflerbach, Sandrasandra.afflerbach (at) uni-siegen.deUNSPECIFIED
Linder, Marc PhilippMarc.Linder (at) dlr.deUNSPECIFIED
Schmidt, Matthiasmatthias.schmidt (at) dlr.dehttps://orcid.org/0000-0002-8795-4370
Date:March 2020
Journal or Publication Title:Applied Thermal Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:169
DOI :10.1016/j.applthermaleng.2020.114961
Page Range:p. 114961
Editors:
EditorsEmailEditor's ORCID iD
Markides, ChristosApplied Thermal EngineeringUNSPECIFIED
Publisher:Elsevier
Series Name:Elsevier- Applied Thermal Engineering
ISSN:1359-4311
Status:Published
Keywords:Moving bed reactor; Calcium oxide; Calcium hydroxide;Thermochemical energy storage; Encapsulation; Nanostructured particles
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: Cosquillo, Aldo
Deposited On:16 Dec 2020 21:07
Last Modified:16 Dec 2020 21:07

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