ORTIZ DOMÍNGUEZ, CARLOS, Carro A. , Chacartegui R. , Valverde J.M. , Perejón A. , Sánchez-Jiménez P.E. , Pérez-Maqueda L.A.
No
J. Clean Prod.
Article
Científica
11.1
1.981
20/08/2022
2-s2.0-85131064081
The Calcium-Looping (CaL) process, based on the multicyclic calcination-carbonation of CaCO3/CaO, is considered a promising Thermochemical Energy Storage (TCES) technology to be integrated into Concentrating Solar Power (CSP) plants. This work proposes a novel CaL integration that operates at low-pressure calcination under pure CO2 and a moderated temperature. Low-pressure calcination (0.01 bar) provides a suitable solution to mitigate CaO sintering and its consequent loss of reactivity in the carbonation stage. Since the temperature for quick calcination in a pure CO2 atmosphere is decreased (from around 950 °C at 1 bar to 765 °C at 0.01 bar), the energy losses at the receiver are minimised. In addition, a reduced calcination temperature allows for the use of metallic receivers already tested at the MW-scale, which significantly increases the CSP-CaL integration reliability. Moreover, multicycle CaO reactivity is promoted in short residence times, allowing the use of a simpler reactor design. Furthermore, there is an increase of 85% in the energy storage density of the system. The proposed plant proposes a smooth integration of the CaL process in CSP plants, with a moderate storage level and supported by a natural gas backup system (solar share higher than 50%). The results show that the solar thermal-to electric efficiency is above 30%. © 2022 Elsevier Ltd
Atmospheric temperature; Calcination; Calcite; Calcium; Calcium carbonate; Carbon dioxide; Carbonation; Energy dissipation; Gas plants; Integration; Sintering; Calcination temperature; Calcination/carbonation; Calcium looping; Concentrating solar; Concentrating solar power; Concentrating solar power plant; Energy density; Low pressures; Process-based; Thermochemical energy storage; Solar energy