采用感应加热的固体电热储能装置多物理场

Multiphysics study of induction heating for solid electric heat storage devices

固体电热储能装置是新能源消纳的有效手段,目前固体电热储能装置大多数都采用电阻式加热,其加热时间长、加热温度不均匀、加热电阻丝使用寿命短、易老化等缺点仍无法解决。为了更有效地提高固体电热储能装置储热能力,本工作搭建了一套采用感应加热的固体电热储能装置,利用感应加热速度快、无污染的特点,将感应加热技术应用在固体电热储能装置中,并利用COMSOL进行模拟计算,研究了不同电流频率对电磁场与温度场的影响以及流体流速对蓄热体温度均温性的影响。结果表明,固体电热储能装置利用铸铁作为储热材料并采用感应加热,具有良好的蓄热特性,同时加热速度以及蓄热体温度相较于电阻式固体电热储能装置具有较大提升,在加热初始阶段,其温升速率最高可以达到8.5℃/min,加热阶段结束时,蓄热体整体温度在900℃;当风速为0.05 m/s时,蓄热体内部温度分布均匀性最佳。在未来电力市场中具备灵活快速的响应能力。研究结果对感应加热技术研究以及固体电热储能装置开发具有一定参考价值。

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.