流动液态锂回路的设计与初步实验研究

Design and preliminary experimental study of flowing liquid lithium loop

对流动的液态锂限制器回路平台的热力学及流动性进行了分析。通过ANSYS分析发现,限制器工作在350℃的温度下,通过真空室壁内侧添加的热屏蔽层及氦冷的应用,可以有效地控制真空室壁的温度在180℃以下。对注锂管法兰的温度分析发现,通过流速2.5m.s-1的水冷设计,能够控制法兰刀口位置的温度在60℃左右。根据液态锂2m3.h-1的流量设计要求,分别估算了液态锂回路中沿程阻力损失及局部阻力损失,综合回路中的锂流动盘与电磁泵之间的高度压差,计算出液态锂驱动所需的电磁泵压头为14.2m。根据流动液态锂实验回路的热力学及流动性分析,设计完成了液态锂回路并开展了流动液态锂实验。实验结果表明,系统温度控制合适,没有出现真空室或注锂法兰过热引起的泄漏。同时电磁泵能够克服阀门及管道的阻力等顺利的驱动液态锂流动形成闭合的循环回路。

The thermodynamics of the platform and liquidity of liquid Li are analyzed by ANSYS code. By adding thermal shield and using He cooling in the inner of vacuum chamber, the vacuum chamber temperature can be controlled below 180oC when the limiter operation temperature heats up to 350℃. By temperature analysis of intersection of Li pipeline and vacuum flange, the water-cooling can effectively control the temperature of the flange knife-edge position. According to the requirement of Li flow rate～2m3.h-1, the friction head loss and local resistance loss in pipe respectively are estimated and the pressure head of electromagnetic pump is 14.2m. According to the analysis results, a set of flowing liquid Li loop system was built and the relevant experiment was carried out. The preliminary experiment results show that liquid Li could smoothly flow in the loop.