Increasing the solar share in combined cycles through thermochemical energy storage
2021
Ortiz Domínguez, Carlos | Chacartegui, Ricardo | Valverde Millán, José Manuel | Carro Paulete, Andrés | Tejada, C. | Valverde García, Juan Sebastián | Universidad de Sevilla. Departamento de Ingeniería Energética | Universidad de Sevilla. Departamento de Matemática Aplicada II (ETSI) | Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
The integration of Concentrating Solar Power (CSP) in combined cycles is a subjects of increasing attention. Combined cycles require high temperature at the gas turbine inlet (typically over 1000 °C), which hinders plant operation in the absence of direct solar radiation using currently commercial storage technologies based on molten salts (with a temperature limit around 600 °C). Thus, solar power share in current Integrated Solar Combined Cycles (ISCC) is typically lower than 20%, while most of the thermal power required is provided by natural gas. The present manuscript proposes the integration in combined cycles of a Thermochemical Energy Storage (TCES) system based on the Calcium-Looping process, which can release the stored energy at temperatures above 1000 °C. The storage charging step uses the heat provided by a CO2 stream previously heated in a high-temperature solar receiver. The configuration of the solar receiver-calciner is fundamental to determine the amount of storable energy. Results from the conceptual model simulation predict overall plant efficiencies above 45% (excluding solar side losses), suggesting a high potential for the development of this novel integration that would allow enhancing the solar share in combined cycles.
Show more [+] Less [-]European Union, Horizon 2020, grant agreement No 727348, project SOCRATCES
Show more [+] Less [-]Ministerio de Economía y Competitividad (MINECO-FEDER) CTQ2017- 83602-C2 (-1-R and -2-R)
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