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Retrofit of a coal-fired power plant with a rock bed thermal energy storage

Roldán Serrano, María Isabel and Knobloch, Kai and Giuliano, Stefano and Engelbrecht, Kurt and Hirsch, Tobias (2023) Retrofit of a coal-fired power plant with a rock bed thermal energy storage. Journal of Energy Storage (75). Elsevier. doi: 10.1016/j.est.2023.109238. ISSN 2352-152X.

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Official URL: https://www.sciencedirect.com/science/article/pii/S2352152X23026361

Abstract

Power production accounts for about one-fifth of the global final energy consumption and over one-third of all energy-related CO2 emissions. Low-cost, large-scale thermal energy storages are considered as solutions for the decarbonization of fossil-fired power plants by their conversion into power-to-heat-to-power systems, so-called thermal storage power plants. This paper investigates the retrofit of a Chilean coal-fired power plant with an innovative solid media storage from a techno-economic perspective. Selecting a storage capacity of 5.27 GWhth, corresponding to 8 h of discharge, and increasing the inlet steam generator temperature from 590 to 650 ◦C lead to the highest annual round-trip efficiency of 34.9% and to up to 3.4% lower levelized cost of electricity. Minimum levelized cost of electricity as low as 88.1 e/MWh is attained and considered as close to competitiveness with well-established molten salt storage systems. A sensitivity analysis shows that assuming even five times lower storage costs, initially the strongest driver of capital expenditure, only meant 4% lower levelized costs of electricity on average. On the other hand, the design of electricity purchase for charging, for example with green power purchase agreements, turns out to be the key lever to a successful implementation.

Item URL in elib:https://elib.dlr.de/199723/
Document Type:Article
Title:Retrofit of a coal-fired power plant with a rock bed thermal energy storage
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Roldán Serrano, María IsabelUNSPECIFIEDhttps://orcid.org/0000-0002-0663-6048148261866
Knobloch, KaiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giuliano, StefanoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Engelbrecht, KurtUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirsch, TobiasUNSPECIFIEDhttps://orcid.org/0000-0003-0063-0128UNSPECIFIED
Date:16 November 2023
Journal or Publication Title:Journal of Energy Storage
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1016/j.est.2023.109238
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
Cabeza, Luisa F.ElsevierUNSPECIFIEDUNSPECIFIED
Publisher:Elsevier
ISSN:2352-152X
Status:Published
Keywords:Thermal energy storage, Techno-economic analysis, Packed bed, Power plant, Carnot battery
HGF - Research field:Energy
HGF - Program:Energy System Design
HGF - Program Themes:Energy System Transformation
DLR - Research area:Energy
DLR - Program:E SY - Energy System Technology and Analysis
DLR - Research theme (Project):E - Systems Analysis and Technology Assessment
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research > Solar High Temperature Technologies
Deposited By: Roldan Serrano, Maria Isabel
Deposited On:07 Dec 2023 14:45
Last Modified:12 Dec 2023 11:18

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