Kinetics and Structural Optimization of Cobalt-Oxide Honeycomb Structures Based on Thermochemical Heat Storage

Thermochemical heat storage is an important solar-heat-storage technology with a high temperature and energy density, which has attracted increasing attention research in recent years. The mono-metallic redox pair Co3O4/CoO realizes exothermic process through reversible reaction. Its basic principle to store by absorption reduction reaction during high-irradiation hours (high temperature) then release exothermic-oxidation low-irradiation (low temperature). This paper presents the design of cobalt-oxide honeycomb structure, extruded from pure Co3O4, porous media heat-storage density conversion rate. Based on experimental data, three-dimensional axisymmetric multi-physics numerical model was developed simulate flow, transfer, mass chemical thermochemical reactor. Unlike previous treatment approach equating reactions surface reactions, this considers consumption generation solids diffusion transfer oxygen medium process, brings simulation results closer real values. Finally, influence physical parameters honeycomb-structured body explored wide range. show that physical-parameter settings structural structure used are reasonable, conducive improving its charging/discharging performance.