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

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  • Gang Xiao

    (Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
    State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China)

  • Zhide Wang

    (Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
    State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China)

  • Dong Ni

    (College of Control Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China)

  • Peiwang Zhu

    (Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
    State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China)

Abstract

Thermochemical heat storage is an important solar-heat-storage technology with a high temperature and high energy density, which has attracted increasing attention and research in recent years. The mono-metallic redox pair Co 3 O 4 /CoO realizes heat storage and exothermic process through a reversible redox reaction. Its basic principle is to store energy by heat absorption through a reduction reaction during high-irradiation hours (high temperature) and then release heat through an exothermic-oxidation reaction during low-irradiation hours (low temperature). This paper presents the design of a cobalt-oxide honeycomb structure, which is extruded from pure Co 3 O 4 , a porous media with a high heat-storage density and a high conversion rate. Based on the experimental data, a three-dimensional axisymmetric multi-physics numerical model was developed to simulate the flow, heat transfer, mass transfer, and chemical reaction in the thermochemical heat-storage reactor. Unlike the previous treatment approach of equating chemical reactions with surface reactions, the model in this paper considers the consumption and generation of solids and the diffusion and transfer of oxygen in the porous medium during the reaction process, which brings the simulation results closer to the real values. Finally, the influence of the physical parameters of the honeycomb-structured body on the storage and exothermic process is explored in a wide range. The simulation results show that the physical-parameter settings and structural design of the cobalt-oxide honeycomb structure used in this paper are reasonable, and are conducive to improving its charging/discharging performance.

Suggested Citation

  • Gang Xiao & Zhide Wang & Dong Ni & Peiwang Zhu, 2023. "Kinetics and Structural Optimization of Cobalt-Oxide Honeycomb Structures Based on Thermochemical Heat Storage," Energies, MDPI, vol. 16(7), pages 1-19, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:7:p:3237-:d:1115724
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    References listed on IDEAS

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    1. Han, Xiangyu & Wang, Liang & Ling, Haoshu & Ge, Zhiwei & Lin, Xipeng & Dai, Xingjian & Chen, Haisheng, 2022. "Critical review of thermochemical energy storage systems based on cobalt, manganese, and copper oxides," Renewable and Sustainable Energy Reviews, Elsevier, vol. 158(C).
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    4. Tescari, S. & Singh, A. & Agrafiotis, C. & de Oliveira, L. & Breuer, S. & Schlögl-Knothe, B. & Roeb, M. & Sattler, C., 2017. "Experimental evaluation of a pilot-scale thermochemical storage system for a concentrated solar power plant," Applied Energy, Elsevier, vol. 189(C), pages 66-75.
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