Permeation and diffusion behaviors of hydrogen and deuterium in molten FLiNaK

Youshi ZENG; Shengwei WU; Yuan QIAN; Lin DU; Guanghua WANG; Yu HUANG; Wenguan LIU; Wei LIU

doi:10.11889/j.0253-3219.2018.hjs.41.010604

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Permeation and diffusion behaviors of hydrogen and deuterium in molten FLiNaK

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | 更新时间：2021-05-19

- Permeation and diffusion behaviors of hydrogen and deuterium in molten FLiNaK
- NUCLEAR TECHNIQUES Vol. 41, Issue 1, Article number: 010604(2018)
- 作者机构：
  
  中国科学院上海应用物理研究所嘉定园区上海 201800
- 作者简介：
- 基金信息：
  
  Strategic Priority Research Program of Chinese Academy of Sciences
- DOI：10.11889/j.0253-3219.2018.hjs.41.010604
  CLC： TL281
- Received：31 August 2017，
  
  Revised：27 October 2017，
  
  Published：10 January 2018
- 稿件说明：
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Youshi ZENG, Shengwei WU, Yuan QIAN, et al. Permeation and diffusion behaviors of hydrogen and deuterium in molten FLiNaK[J]. Nuclear techniques, 2018, 41(1): 010604
DOI：

Youshi ZENG, Shengwei WU, Yuan QIAN, et al. Permeation and diffusion behaviors of hydrogen and deuterium in molten FLiNaK[J]. Nuclear techniques, 2018, 41(1): 010604 DOI： 10.11889/j.0253-3219.2018.hjs.41.010604.

摘要

利用氢同位素在熔盐中的扩散渗透特性测试系统，本研究对FLiNaK熔盐中氢和氘的渗透扩散行为进行了研究。首先，通过对比分析熔盐侧充氢和金属侧充氢的实验结果，发现通过熔盐侧充氢的实验可更准确地反映FLiNaK熔盐中氢的渗透扩散行为及其性质。其次，通过熔盐侧充氢实验，获得了550-700 ℃时FLiNaK熔盐中氢的扩散系数与溶解度常数，两者可分别表述为：

=1.62×10

-5

exp（-48.20×10

）m

·s

-1

和

=6.18×10

-5

exp（-11.14×10

）mol·m

-3

·Pa

-1

。最后，通过对比分析金属侧充氢和金属侧充氘的实验结果，发现同位素效应并不影响FLiNaK熔盐中氢的渗透扩散行为及其性质的研究，从而为氢和氘代替氚进行FLiNaK熔盐中氚行为性质的研究提供实验基础。

Abstract

Background

Molten FLiNaK is a secondary heat-transfer fluid of a molten salt reactor or a FLiBe self-cooled nuclear fusion reactor

in which tritium would be produced at high rates and permeate the molten FLiNaK.

Purpose

The aim is to provide more reliable reference for tritium behaviors in molten FLiNaK by further study of the permeation and diffusion behaviors of hydrogen as well as the isotope effect on hydrogen behaviors.

Methods

Experiments on hydrogen charged at salt surface and metal surface in molten FLiNaK were conducted to study permeation and diffusion characteristics of hydrogen isotope in molten salt. And contrast experiments between hydrogen and deuterium charged at metal surface were carried out to study the isotope effect on hydrogen behaviors.

Results

The results showed that hydrogen charged at salt surface had more advantages for reporting the permeation and diffusion characteristics of hydrogen. And the diffusion coefficients and solubility constants of hydrogen in molten salt FLiNaK could be correlated to

=1.62×10

-5

exp(-48.20×10

) m

·s

-1

and

=6.18×10

-5

exp(-11.14×10

) mol·m

-3

·Pa

-1

. The deuterium showed little isotope effect on the permeation and diffusion behaviors of hydrogen in molten FLiNaK.

Conclusion

The permeation and diffusion characteristics of tritium are analogous to the hydrogen behaviors

indicating that hydrogen can be used forsubstituting tritium in the experimental researches in molten FLiNaK.

关键词

Keywords

references

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