Treffer: Heterogeneous dynamic calcination process of porous CaCO3 particles based on Taichi-lattice Boltzmann method.

Calcination of calcium carbonate is a fundamental but important means for calcium looping thermochemical energy storage (TCES). An efficient simulation to understand the heterogenous calcination process of CaCO 3 is important for improving the heat storage/release performance. In this work, a lattice Boltzmann (LB) model is proposed to simulate the heterogenous physicochemical processes of CaCO 3 calcination. As compared with previous models, the semiempirical formulas instead of assumed-set values are adopted for physical properties in the present model, and simultaneously, the effect of spatially variable and time-dependent porous structure is considered on the reactive transport processes. Meanwhile, to accelerate the computing performance, the LB simulations are implemented by graphics processing unit parallel computing based on the Taichi language. After the substantial validity of the proposed model, the calcination process of a CaCO 3 particle is investigated and discussed. The comparison results with the previous model show that, owing to disregarding the changes of porous structure, the previous model overestimates the mass transfer resistance CO 2 during diffusion and underestimates the heat transfer resistance, while the distributions of temperature and CO 2 concentration predicted by the present model match better with physically realistic processes inside the porous reactants. This work develops an efficient LB model to study the heterogenous physicochemical processes in TCES, contributing to extending its application in the design and optimization of the TCES. [ABSTRACT FROM AUTHOR]

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