多孔介质热化学储能反应器中的辐射传热与结构优化

Abstract Thermochemical energy storage (TCES) reactors based on metal oxide redox cycles (MORC) are essential for integrating intermittent renewable energy into high-temperature applications. However, their performance is often constrained by complex multiphysics interactions and inadequate thermal management. This study conducts a comprehensive analysis of heat transfer in a porous packed-bed reactor using a validated two-dimensional axisymmetric multiphysics model. The results reveal that a significant reduction in insulation thermal conductivity nearly doubles the average porous medium temperature, though this compromises radial temperature uniformity. Increasing the heat transfer fluid’s inlet temperature above 1000 K substantially enhances radiative heat transfer, which accounts for up to 90 % of the total heat flux, whereas higher flow rates only provide marginal convective gains. A lower porosity reduces axial thermal gradients but decreases radiative heat transfer efficiency. Structural optimization shows that increasing the porous medium radius raises the core temperature by 6 %, while targeted insulation design achieves a 10.2 % gain with minimal peripheral loss. These findings confirm radiation as the dominant heat transfer mechanism at extreme temperatures and highlight the need for coupled thermophysical and geometric optimization. This study advances TCES reactor design for high-performance MORC-based gas–solid systems and establishes a robust modeling framework to guide the scalable development of next-generation thermal energy storage technologies.