超导电缆过冷液氮冷却循环系统设计及试验验证

Design and Experiment of Subcooled Liquid Nitrogen Cooling Circulation System for Superconducting Cables

超导电缆过冷液氮冷却循环系统是三相同轴高温超导电缆试验装置中的主要分系统。根据电缆运行参数和负荷要求,进行了过冷液氮冷却循环系统的流程设计;对冷箱和稳压装置进行了结构设计;对流程阻力进行了分析计算,选择了水力曲线匹配的液氮泵;结合电缆的热负载要求,对浸液式盘管换热器进行设计计算,联机试验结果表明设计满足冷却要求。

The subcooled liquid nitrogen cooling circulation system for superconducting cables is a main sub-system in the three-coaxial high-temperature superconducting cable test device. According to the operating parameters and load requirements of the cable,the process design of the subcooled liquid nitrogen cooling circulation system and the structural design of cold box and pressure control device are finished. The flow resistance is analyzed and calculated to choose the liquid nitrogen pump that matching the hydraulic curve. Combined with the heat load required by the cable,the immersion coil heat exchanger in the system is designed and calculated. The on-line test results show that the design meets the cooling requirements.