Thermochemical storage for CSP via redox structured reactors/heat exchangers: The RESTRUCTURE project

George Karagiannakis*, Chrysoula Pagkoura, Athanasios G. Konstandopoulos, Stefania Tescari, Abhishek Singh, Martin Roeb, Matthias Lange, Johnny Marcher, Aleix Jové, Cristina Prieto, Michael Rattenbury, Andreas Chasiotis

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

5 Citations (Scopus)
13 Downloads (Pure)

Abstract

The present work provides an overview of activities performed in the framework of the EU-funded collaborative project RESTRUCTURE, the main goal of which was to develop and validate a compact structured reactor/heat exchanger for thermochemical storage driven by 2-step high temperature redox metal oxide cycles. The starting point of development path included redox materials qualification via both theoretical and lab-scale experimental studies. Most favorable compositions were cobalt oxide/alumina composites. Preparation of small-scale structured bodies included various approaches, ranging from perforated pellets to more sophisticated honeycomb geometries, fabricated by extrusion and coating. Proof-of-concept of the proposed novel reactor/heat exchanger was successfully validated in small-scale structures and the next step included scaling up of redox honeycombs production. Significant challenges were identified for the case of extruded full-size bodies and the final qualified approach related to preparation of cordierite substrates coated with cobalt oxide. The successful experimental evaluation of the pilot reactor/heat exchanger system constructed motivated the preliminary techno-economic evaluation of the proposed novel thermochemical energy storage concept. Taking into account experimental results, available technologies and standard design aspects a model for a 70.5 MWe CSP plant was defined. Estimated LCOE costs were calculated to be in the range of reference values for Combined Cycle Power Plants operated by natural gas. One of main cost contributors was the storage system itself, partially due to relatively high cost of cobalt oxide. This highlighted the need to identify less costly and equally efficient to cobalt oxide redox materials.

Original languageEnglish
Title of host publicationSolarPACES 2016
Subtitle of host publicationInternational Conference on Concentrating Solar Power and Chemical Energy Systems
PublisherAmerican Institute of Physics
ISBN (Electronic)9780735415225
DOIs
Publication statusPublished - 27 Jun 2017
Externally publishedYes
Event22nd International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2016 - Abu Dhabi, United Arab Emirates
Duration: 11 Oct 201614 Oct 2016
Conference number: 22

Publication series

NameAIP Conference Proceedings
Volume1850
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference22nd International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2016
Abbreviated titleSolarPACES 2016
CountryUnited Arab Emirates
CityAbu Dhabi
Period11/10/1614/10/16

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