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液态金属钠冷快堆电站蒸汽发生器的钠泄漏会导致钠水反应和氢的产生。因此,钠中微量氢的探测是判断蒸汽发生器中是否存在钠泄漏的重要手段,是确保快堆电站安全运行的关键问题之一。清华大学液态金属技术研究室建立了服务于钠中微量氢探测的氢计钠回路。为了准确测量微氢含量,需要确保回路中钠的纯度,尤其是氢的含量应加以严格控制。在氢计钠回路中,利用钠温降低后,钠中杂质含量降低的原理,达到去除钠中杂质的目的。 本文给出了氢计钠回路冷阱净化系统的设计特点和参数,并讨论了它的调试结果。 为了调节流量的方便,冷阱净化系统布置在电磁泵的出口。它由回热器和冷阱组成。回热器位于冷阱的上部。主回路的高温钠流过回热器后,在冷阱的入口,钠温降至180℃,进入冷阱后,钠从两侧进入净化区,到达底部时,其温度降至110℃。冷阱选用空气冷却。经回热器的作用,净化后的钠温升至与主回路钠温相近。然后,回到电磁泵入口。 根据调试结果,通过降低冷阱流量及主回路钠温或者增加冷却空气流量及切除冷阱预热电源,冷阱钠温可以降至要求的110℃。作者认为,后者更符合设计规定和氢计实验的需要,而且能满足核电站运行的要求。
Sodium Leaks from a Liquid Metal Sodium Fast Reactor Steam Generator lead to sodium-water reactions and hydrogen production. Therefore, the detection of trace amounts of hydrogen in sodium is an important measure to judge whether there is sodium leakage in the steam generator, and it is one of the key problems to ensure the safe operation of fast reactor. Tsinghua University, liquid metal technology laboratory established in the detection of sodium in the small amount of hydrogen hydrogen meter sodium circuit. In order to accurately measure the micro-hydrogen content, it is necessary to ensure the purity of the sodium in the circuit, in particular, the hydrogen content should be strictly controlled. In the hydrogen meter sodium circuit, the use of sodium temperature is reduced, the reduction of impurities in the sodium content of the principle to achieve the purpose of removing impurities in sodium. In this paper, the design features and parameters of the cold trap system for hydrogen meter sodium loop are given, and the results of the debugging are discussed. In order to regulate the flow of convenience, cold trap purification system is arranged in the electromagnetic pump outlet. It consists of a regenerator and a cold trap. Regenerator is located in the upper part of the cold trap. After the high temperature sodium in the main circuit flows through the regenerator, at the inlet of the cold trap, the sodium temperature drops to 180 ° C. After entering the cold trap, the sodium enters the purification zone from both sides and reaches 110 ° C at the bottom. Cold trap selection of air cooling. After the role of the regenerator, purified sodium temperature rise and the main circuit similar to the sodium temperature. Then, return to the electromagnetic pump inlet. Based on the results of the commissioning, the cold trap sodium temperature can be reduced to 110 ° C as required by reducing the cold trap flow and the main circuit sodium temperature or increasing the cooling air flow and cutting off the cold trap warm-up power. The author believes that the latter is more in line with the design requirements and experimental hydrogen needs, but also to meet the requirements of nuclear power plant operation.