Abstract One of the reference technologies for the fuel cycle of fusion machines is Pd/Ag membranes. This technology is proposed to be implemented in tritium recovery systems because of their exclusive selectivity toward molecular hydrogen isotopes (Q = H, D, T). To perform scaling-up studies for the Tritium Extraction and Removal System of the European DEMOnstration fusion power reactor (DEMO) with a solid blanket, a one-dimensional simulation code was recently developed and successfully validated with experiments. This code relies on different operational (e.g., feed pressure and temperature), geometrical (e.g., permeator length), and membrane-intrinsic (e.g., Q2 permeability) parameters given as input. The main outcome is the Q2 permeation efficiency, defined as the Q2 permeate–to–feed flow ratio. Because of the low concentrations of Q2 expected at the He stream purging the solid blanket, the surface effects are expected to be important, decreasing the separation efficiency of the Pd/Ag permeators. In this paper the role of surface effects on the permeation efficiency is studied for a DEMO-relevant scenario (feeding mixture: HT/H2/He). Moreover, a sensitivity study is also given demonstrating the high impact of the permeation area, temperature, and feed pressure on the permeation efficiency of HT.

中文翻译：

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用于 EU-HCPB 毯子氚提取和去除系统的反应器级 Pd/Ag 渗透器的灵敏度分析和尺寸设计

摘要 Pd/Ag 膜是聚变机燃料循环的参考技术之一。由于该技术对分子氢同位素（Q = H、D、T）具有独特的选择性，因此建议在氚回收系统中实施该技术。为了对带有实心毯的欧洲示范聚变动力反应堆 (DEMO) 的氚提取和去除系统进行放大研究，最近开发了一个一维模拟代码并通过实验成功验证。该代码依赖于作为输入给出的不同操作（例如，进料压力和温度）、几何（例如，渗透器长度）和膜固有（例如，Q2 渗透性）参数。主要结果是 Q2 渗透效率，定义为 Q2 渗透与进料流量比。由于在吹扫固体毯的 He 流中预期 Q2 浓度较低，因此预计表面效应很重要，这会降低 Pd/Ag 渗透器的分离效率。在本文中，针对 DEMO 相关场景（进料混合物：HT/H2/He）研究了表面效应对渗透效率的作用。此外，还进行了敏感性研究，证明渗透面积、温度和进料压力对 HT 渗透效率的影响很大。