Design and performance evaluation of multi-layered reactor for calcium-based thermochemical heat storage with multi-physics coupling

X.C. Han, H.J. Xu and C.Y. Zhao

Renewable Energy, 2022, vol. 195, issue C, 1324-1340

Abstract: Thermochemical heat storage is a process of storing and releasing thermal energy with gas-solid reactions, e.g. the interaction of oxides and water vapor. To guarantee a more balanced reaction pressure in the thermochemical heat storage, a multi-layered reactor with multiple reacting zones was designed based on calcium materials. This novel fixed-bed reactor could enable material stacking more rational and eliminate the issue of excessive stacking causing steam obstruction. In comparison to the conventional straight-cylinder reactor, the multi-layered reactor has a more balanced pressure distribution. In this study, a mathematical model for thermochemical heat storage with multiple physical fields coupling is developed based on the multi-layered reactor, and the verification results show that the mathematical model is in good agreement with the experimental data in literature. The thermochemical heat storage process of materials with porosities of 0.5, 0.6, 0.7, 0.8, and 0.9 was numerically simulated by finite element method (FEM) under experimental boundary and initial conditions. Results indicate that for the whole 100–120 min exothermic period, the peak temperature of the process may reach around 510 °C. With different porosities, the total power output can be up to 470 W, 429 W, 330 W, 209 W, and 93 W and the maximum pressures are respectively 2.9 MPa, 1.2 MPa, 0.27 MPa, and 0.21 MPa near the entrance. The mathematic model and numerical simulation for the multi-layered thermochemical reactor with heat extraction process in present work could provide data reference for thermochemical theoretical research, reactor design, and reaction optimization.

Keywords: Multi-physics coupling; Thermochemical heat storage; Calcium oxide/calcium hydroxide; Chemical reactor design; Numerical simulation (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:195:y:2022:i:c:p:1324-1340

DOI: 10.1016/j.renene.2022.06.120

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