关键词: 感应加热, 电热储能装置, 多物理场耦合, 温度场均温性

Abstract:

Solid electric energy storage devices represent a promising avenue for efficient energy consumption. However, traditional methods that rely on resistance heating have inherent shortcomings, including prolonged heating times, uneven temperature distribution, limited lifespan of heating resistance wires, and susceptibility to aging. To significantly improve the performance and heat storage capacity of solid electric energy storage devices, this paper proposes the integration of induction heating technology, known for its rapid and pollution-free heating. We used comprehensive COMSOL simulations to investigate the impact of various current frequencies on the electromagnetic field and temperature distribution of induction heating. We also explored how fluid flow rates influence temperature uniformity within a thermal storage unit. Our findings demonstrate that when cast iron is employed as the thermal storage material and induction heating is adopted, solid electric energy storage devices exhibit superior thermal storage properties. Notably, these devices offer substantially faster initial heating rates (up to 8.5 ℃ per minute) and achieve a higher thermal storage body temperature (900 ℃) compared to traditional resistance-based devices. Moreover, under conditions of a wind speed of 0.05 m/s, the cast iron thermal storage unit exhibited optimal temperature uniformity. This innovative approach not only augments the performance of solid electric energy storage devices but also equips them with flexible and rapid response capabilities, effectively positioning them in the future electricity market.

Key words: induction heating, solid electric thermal energy storage device, multiphysics coupling, temperature field uniformity