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Continuous monitoring of lithium in dynamic Pb-l7Li systems

机译:连续监控动态Pb-17Li系统中的锂

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During operation of the liquid metal blanket, lithium depletion may occur from the Pb--l7Li alloy. It is thus necessary to have a reliable and accurate method for the monitoring of the Li content and for its adjustment. Continuous methods are the most attractive. In the frame of this work, three methods available for the on-line determination of the Li content of Pb--Li alloys (electrochemical sensor, electrical resistivity meter and plugging indicator) have been assessed in a liquid metal loop system. Although the tested electrochemical sensors were susceptible to thermal shock, the results obtained under static conditions show that the concept is satisfying the sensor is specific to lithium, simple to use and it can detect a composition change of f 0.l5 at% Li. The solid e1ectrolyte (6-alumina) is the key element but no difficulty is expected to get material with improved mechanical properties taking into account recent developments in this field. The resistivity meter is robust and very sensitive to composition change, the minimum detectable limit being I 0.l5 at% Li. It is easy to handle but its replacement in a loop could be slightly more complicated than the electrochemical sensor. The p1ugging indicator does not need calibration and it is very robust. However, changes in the composition of the liquid alloy must be higher than l at/100 Li to be detected. The plugging temperature is well related to the liquidus temperature of the alloy but a good knowledge of the Li--Pb phase diagram is necessary to deduce the Li concentration. Therefore, it is thought that the monitors with greatest potential for continuous monitoring of the Li content in the liquid metal blanket are the electrochemical sensor and the resistivity meter.
机译:在液态金属覆盖层运行期间,Pb-17Li合金可能会发生锂耗尽。因此,需要一种可靠且准确的方法来监测Li含量及其调节。连续方法是最有吸引力的。在这项工作的框架中,在液态金属回路系统中,评估了三种在线测定Pb-Li合金中Li含量的方法(电化学传感器,电阻率仪和堵漏指示器)。尽管经过测试的电化学传感器很容易受到热冲击的影响,但在静态条件下获得的结果表明,该概念满足了该传感器特定于锂的要求,易于使用,并且可以检测到f 0.l5 at%Li的成分变化。固体电解质(6-氧化铝)是关键元素,但考虑到该领域的最新发展,预计获得具有改善的机械性能的材料并不困难。电阻率仪坚固耐用,对成分变化非常敏感,最小可检测极限为I 0.l5 at%Li。它很容易处理,但是在循环中进行更换可能比电化学传感器要复杂一些。指示指示器不需要校准,并且非常坚固。但是,液态合金的成分变化必须大于100 l / l时才能被检测到。封堵温度与合金的液相线温度有很好的关系,但是对Li-Pb相图的深入了解对于推断Li的浓度是必要的。因此,认为对液体金属覆盖层中的Li含量进行连续监测的潜力最大的监测器是电化学传感器和电阻率计。

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