Direct solar-driven calcination kinetics for Ca-looping thermochemical energy storage

Ca-looping thermochemical energy storage is considered to be an efficient and low-cost thermal ener g y storage technology for third-generation concentrated solar thermal power generation. However, the limitation of con-ventional kinetic studies cannot satisfy the direct solar driven calcination reaction mechanism. Therefore, a direct solar-driven calcination kinetics function of calciu m carbonate particles based on multivariate nonlinear regression method is proposed. This scheme driven by full-wavelength solar ener g y has widely universality and application taking the effects of particle size, porosity, doping composition, temperature and CO2 concentration into account, which intuitively reflects the essence of photothermal conversion characteristics and reveals the mechanisms of photothermal calcination reactions. The heat storage efficiency of Fe:Mn:Al modified calciu m carbonate particles after 20 cycles is 93.03%, the spectral absorption rate is 84.27%. This work provides a new idea for the in-depth study of the decomposition kinetics of solar-driven calcium-based particles.