Permeability of hydrogen in molten salt FLiNaK(LiF-NaF-KF)

ZENG Youshi; DU Lin; PI Li; WU Shengwei; QIAN Yuan; WANG Guanghua; HUANG Yu; ZHU Haiyun; LIU Wei

doi:10.11889/j.0253-3219.2015.hjs.38.020603

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Permeability of hydrogen in molten salt FLiNaK(LiF-NaF-KF)

更新时间：2021-03-03

- Permeability of hydrogen in molten salt FLiNaK(LiF-NaF-KF)
- NUCLEAR TECHNIQUES Vol. 38, Issue 2, Article number: 020603(2015)
- 作者机构：
  
  1. 中国科学院上海应用物理研究所嘉定园区,上海,201800
  2. 中国科学院核辐射与核能技术重点实验室,上海,201800
  3. 中国科学院大学,北京,100049
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.020603
  CLC：
- Published：02 February 2015
- 稿件说明：
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ZENG Youshi, DU Lin, PI Li, et al. Permeability of hydrogen in molten salt FLiNaK(LiF-NaF-KF)[J]. Nuclear techniques, 2015, 38(2): 020603
DOI：

ZENG Youshi, DU Lin, PI Li, et al. Permeability of hydrogen in molten salt FLiNaK(LiF-NaF-KF)[J]. Nuclear techniques, 2015, 38(2): 020603 DOI： 10.11889/j.0253-3219.2015.hjs.38.020603.

摘要

FLiNaK(LiF-NaF-KF)熔盐在高温熔盐堆或聚变堆的应用中面临着氚扩散渗透的问题。研究H2在FLiNaK熔盐中的渗透行为，能够为FLiNaK熔盐中氚的控制提供依据。氢同位素在熔盐中的扩散渗透特性测试系统主要用于测定熔盐中氢同位素的渗透行为，以获得氢同位素在熔盐中的扩散系数和溶解度常数等相关参数。通过该系统，本文对FLiNaK熔盐中H2的渗透、扩散和溶解等行为进行了研究。结果表明，受实验装置和实验方法的限制，H2在FLiNaK熔盐中的渗透主要以氢原子（或离子）的方式进行。在500?700 °C时，FLiNaK熔盐中H2的扩散系数与温度的关系满足：DFLiNaK-H=1.12×10?4exp(?66.40×103/RgT) (m2?s?1)，其扩散活化能为66.40kJ?mol?1。而对于FLiNaK熔盐中H2的溶解常数，其与温度的关系可表述为：KFLiNaK-H=2.1×10?5 exp(?0.94×103/RgT) (mol?m?3?Pa?1/2)。

Abstract

Background: Molten salt FLiNaK(LiF-NaF-KF) has potential to be used as heat-transfer fluid of molten salt nuclear reactor

because of its high chemical stability

moderate specific heat and sufficient thermal conductivity. One adverse characteristic was that tritium was produced at relatively high rates in such reactors

which could diffuse through metals at high temperature and thus required to evaluate the behavior of tritium in FLiNaK. Purpose: This study aims to the permeation behavior of hydrogen in molten salt FLiNaK

providing the basis for tritium permeation behavior in molten salt. Methods: Plentiful experiments were conducted in a testing system for permeation and diffusion characteristics of hydrogen isotope in molten salt. Numerical fitting method of experimental results was performed to obtain the hydrogen permeation characteristics in molten salt FLiNaK. Results: The results showed that hydrogen was diffusing as H+ species in molten salt FLiNaK. The diffusion coefficients and solubility constants of hydrogen in molten salt FLiNaK can be correlated to DFLiNaK-H=1.12×10?4exp(?66.40×103/RgT) (m2?s?1) and KFLiNaK-H=2.1×10?5exp(?0.94×103/RgT) (mol?m?3?Pa?1/2). Conclusion: The diffusion coefficients and solubility constants of hydrogen in molten salt FLiNaK were derived from the experimental results.Cited

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