Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessment

The operating temperature of a steam turbine is limited to 565 ºC by the molten nitrate heat-transfer fluid; therefore, a new molten salt chemistry is needed to increase the maximum operating temperature in the new generation of CSP plants and improve the thermal-to-electrical energy conversion effi...

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Autores: Fernández, Ángel G., Cabeza, Luisa F.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:España
Institución:Universitat de Lleida (UdL)
Repositorio:Repositori Obert UdL
OAI Identifier:oai:repositori.udl.cat:10459.1/67709
Acceso en línea:https://doi.org/10.1016/j.est.2019.101125
http://hdl.handle.net/10459.1/67709
Access Level:acceso abierto
Palabra clave:Concentrated solar power
Thermal energy storage
Corrosion mitigation
Chloride molten salt
Thermal purification treatment
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spelling Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessmentFernández, Ángel G.Cabeza, Luisa F.Concentrated solar powerThermal energy storageCorrosion mitigationChloride molten saltThermal purification treatmentThe operating temperature of a steam turbine is limited to 565 ºC by the molten nitrate heat-transfer fluid; therefore, a new molten salt chemistry is needed to increase the maximum operating temperature in the new generation of CSP plants and improve the thermal-to-electrical energy conversion efficiency in the turbine block, such as chloride molten salts. Nevertheless, the prevention of high-temperature corrosion on containment materials using chlorides plays a critical role and a corrosion mitigation plan is needed to achieve the target plant lifetime of 30 years. This paper presents a corrosion mitigation strategy focused on different thermal treatments performed in the eutectic ternary chloride molten salt composed by MgCl2/NaCl/KCl (55.1 wt.%/24.5 wt. %/20.4 wt.%). Corrosion rates were obtained through linear polarization resistance technique in a conventional commercial stainless steel (AISI 304) at 720 ºC during 5 h of immersion after the different thermal treatments carried out. Scanning electron microscopy and XRD analysis were used to confirm the corrosion rates and corrosion layer proposed by electrochemical techniques, obtaining a minimum corrosion rate of 6.033 mm/year for the best thermal treatment performed.Angel G. Fernández wants to acknowledge the financial support from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant No 712949 (TECNIOspring PLUS) and from the Agency for Business Competitiveness of the Government of Catalonia. This work was partially funded by the Ministerio de Ciencia, Innovación y Universidades de España (RTI2018-093849-B-C31). The authors would like to thank the Catalan Government for the quality accreditation given to their research group GREiA (2017 SGR 1537). GREiA is a certified agent TECNIO in the category of technology developers from the Government of Catalonia. This work is partially supported by ICREA under the ICREA Academia programme.Elsevier2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://doi.org/10.1016/j.est.2019.101125http://hdl.handle.net/10459.1/67709reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)Inglésinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-093849-B-C31Reproducció del document publicat a https://doi.org/10.1016/j.est.2019.101125Journal of Energy Storage, 2020, vol. 27, p. 101125-1-101125-7info:eu-repo/grantAgreement/EC/H2020/712949cc-by-nc-nd (c) Ángel G. Fernández, Luisa F. Cabeza, 2019info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/oai:repositori.udl.cat:10459.1/677092026-06-24T12:42:17Z
dc.title.none.fl_str_mv Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessment
title Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessment
spellingShingle Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessment
Fernández, Ángel G.
Concentrated solar power
Thermal energy storage
Corrosion mitigation
Chloride molten salt
Thermal purification treatment
title_short Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessment
title_full Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessment
title_fullStr Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessment
title_full_unstemmed Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessment
title_sort Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessment
dc.creator.none.fl_str_mv Fernández, Ángel G.
Cabeza, Luisa F.
author Fernández, Ángel G.
author_facet Fernández, Ángel G.
Cabeza, Luisa F.
author_role author
author2 Cabeza, Luisa F.
author2_role author
dc.subject.none.fl_str_mv Concentrated solar power
Thermal energy storage
Corrosion mitigation
Chloride molten salt
Thermal purification treatment
topic Concentrated solar power
Thermal energy storage
Corrosion mitigation
Chloride molten salt
Thermal purification treatment
description The operating temperature of a steam turbine is limited to 565 ºC by the molten nitrate heat-transfer fluid; therefore, a new molten salt chemistry is needed to increase the maximum operating temperature in the new generation of CSP plants and improve the thermal-to-electrical energy conversion efficiency in the turbine block, such as chloride molten salts. Nevertheless, the prevention of high-temperature corrosion on containment materials using chlorides plays a critical role and a corrosion mitigation plan is needed to achieve the target plant lifetime of 30 years. This paper presents a corrosion mitigation strategy focused on different thermal treatments performed in the eutectic ternary chloride molten salt composed by MgCl2/NaCl/KCl (55.1 wt.%/24.5 wt. %/20.4 wt.%). Corrosion rates were obtained through linear polarization resistance technique in a conventional commercial stainless steel (AISI 304) at 720 ºC during 5 h of immersion after the different thermal treatments carried out. Scanning electron microscopy and XRD analysis were used to confirm the corrosion rates and corrosion layer proposed by electrochemical techniques, obtaining a minimum corrosion rate of 6.033 mm/year for the best thermal treatment performed.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1016/j.est.2019.101125
http://hdl.handle.net/10459.1/67709
url https://doi.org/10.1016/j.est.2019.101125
http://hdl.handle.net/10459.1/67709
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-093849-B-C31
Reproducció del document publicat a https://doi.org/10.1016/j.est.2019.101125
Journal of Energy Storage, 2020, vol. 27, p. 101125-1-101125-7
info:eu-repo/grantAgreement/EC/H2020/712949
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Ángel G. Fernández, Luisa F. Cabeza, 2019
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
rights_invalid_str_mv cc-by-nc-nd (c) Ángel G. Fernández, Luisa F. Cabeza, 2019
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositori Obert UdL
instname:Universitat de Lleida (UdL)
instname_str Universitat de Lleida (UdL)
reponame_str Repositori Obert UdL
collection Repositori Obert UdL
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repository.mail.fl_str_mv
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