Conversion of combined heat and power coal-fired plants to Carnot batteries - Prospective sites for early grid-scale applications

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F22%3A00359838" target="_blank" >RIV/68407700:21220/22:00359838 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21720/22:00359838

Result on the web

<a href="https://doi.org/10.1016/j.est.2022.105548" target="_blank" >https://doi.org/10.1016/j.est.2022.105548</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.est.2022.105548" target="_blank" >10.1016/j.est.2022.105548</a>

Result language

angličtina

Original language name

Conversion of combined heat and power coal-fired plants to Carnot batteries - Prospective sites for early grid-scale applications

Original language description

Repurposing fossil fuel-fired plants to electricity storage systems known as Carnot batteries (CB) has been proposed before. This technology provides a prospect of high-power, high-capacity systems for medium and long duration storage. Significant benefits on capital cost from second use of the existing infrastructure and low cost per added MWh are expected to outweigh low round-trip efficiency. Retrofitting large coal plants is still demanding in terms of absolute capital, lack of previous experience and uncertain business. This work proposes smaller coal-fired combined heat and power plants with 50 MWe output as a suitable prospective site for conversion to CB instead of large power plants. Higher overall efficiency with heat providing an additional stream of revenue, plant flexibility, or smaller system size make such application more beneficial, especially for first-of-a-kind installations. Therefore, this paper illustratively investigates the techno-economic prospects of the conversion of a cogeneration coal plant to a CB. The proposed system is described. It is based on direct electrical heating for the power to heat process, thermal energy storage based on either molten salts or gravel packed bed and finally, heat exchangers integrated to operate as steam generators. The sizing of major components is followed by costing. In case of a backpressure turbine, packed bed storage and discharge duration of 5 h the specific cost of electrical storage system is around 200 /kWhe, while in the case with no heat production and condensing turbine (full condensation regime), it is around 100 /kWhe. The operation regimes and expected revenue streams from both electricity and heat are evaluated. A comparison with existing technologies is performed and the levelised cost of storage in presented cases varies from 35 to 179 /MWhe for the fully condensing regime and 35 to 291 /MWhe for the backpressure cogeneration regime.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20704 - Energy and fuels

Project

<a href="/en/project/TJ04000326" target="_blank" >TJ04000326: Waste heat utilization for energy storage based on the concept of Carnot batteries</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Energy Storage

ISSN

2352-152X

e-ISSN

2352-1538

Volume of the periodical

55

Issue of the periodical within the volume

September

Country of publishing house

GB - UNITED KINGDOM

Number of pages

19

Pages from-to

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UT code for WoS article

000862212700001

EID of the result in the Scopus database

2-s2.0-85137170108