Kinetics of deuterium desorption from Pb17Li eutectic

AbstractThe recovery of tritium from the Pb17Li blanket concerns closely the design of a fusion reactor. In the recent past some theoretical studies have been carried out with the main purpose to demonstrate the feasibility of some extraction units usually applied in chemical plants. It was demonstrated that some units, such as the droplets spray and bubble towers, were suitable for extracting tritium from the Pb17Li alloy on the basis of the known phisico-chemical characteristics of the hydrogen isotopes/Pb17Li system and those data thermodynamically deduced. For an effective design of these units the knowledge of kinetics of tritium desorption from Pb17Li was necessary.In this paper are reported the data of deuterium desorption from the eutectic Pb17Li under different operating conditions of temperature and deuterium partial pressures in the liquid Pb17Li alloy. The theoretical analysis of these data has shown that the overall desorption process is governed by the diffusion of deuterium atoms in the Pb17Li and by the heterogeneous reaction at the gas-eutectic interface of the deuterium atoms recombination.

日本語訳

摘要：从Pb-17Li包层中回收氚与聚变反应堆的设计密切相关。近年来，开展了一些理论研究，主要目的是验证通常应用于化工厂的某些提取装置的可行性。研究表明，基于氢同位素/Pb-17Li体系的已知物理化学特性以及热力学推导的数据，某些装置（如液滴喷雾塔和鼓泡塔）适用于从Pb-17Li合金中提取氚。为了有效设计这些装置，需要了解氚从Pb-17Li中解吸的动力学知识。本文报告了在不同操作条件（温度及液态Pb-17Li合金中氘分压）下，从共晶Pb-17Li中解吸氘的数据。对这些数据的理论分析表明，整体解吸过程受氘原子在Pb-17Li中的扩散以及氘原子在气体-共晶界面上的非均相复合反应所控制。