期刊
CHEMICAL ENGINEERING JOURNAL
卷 420, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129618
关键词
Thermochemical Energy Storage (TCES); Concentrating Solar Power (CSP); Carbonation kinetics; Strontium oxide
This study investigated the kinetics of the carbonation of a SrO-Al2O3 composite for TCES-CSP, with results showing a low activation energy and good reaction rate within the temperature range suitable for TCES. The calculated conversion-time profiles from the kinetic models applied in the study demonstrated good agreement with experimental data.
In framework of the thermochemical energy storage (TCES) in concentrating solar power (CSP) applications, great attention is focused on the SrCO3/SrO system, which is characterized by remarkably high theoretical volumetric energy density (4 GJ m(SrCO3)(-3)) and working temperatures (1200 degrees C). It has been shown that the incorporation of Al2O3 in the SrO/SrCO3 system can successfully hinder the sintering and agglomeration phenomena, thus improving the performances of the system. Aiming at providing useful information for the design, simulation and scale up of a reactor for the energy storage, besides the multicycle carbonation conversion, the evaluation of the reaction kinetics is crucial. Thus, in this work, the kinetics of the carbonation of a SrO-Al2O3 composite (34%wt of Al2O3) for TCES-CSP has been investigated for the first time using a two-stage kinetic model. In particular, tests have been performed in a thermogravimetric analyzer at operating conditions relevant for TCES, namely at 1 atm of CO2 partial pressure within the temperature range of 900-1050 degrees C. The reaction rate, the intrinsic carbonation kinetic constant, the characteristic product layer thickness and their dependence on the temperature has been evaluated in the temperature range 900-1000 degrees C; the activation energy has been found to be 52 kJ mol(-1). Finally, comparison of the calculated conversion-time profiles, obtained from the applied kinetic models, with experimental data revealed a good agreement.
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