论文部分内容阅读
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=2.1×10-5exp(-0.94×103/RgT)(mol·m-3·Pa-1/2)。
FLiNaK (LiF-NaF-KF) molten salt faces the problem of tritium diffusion and penetration in applications of high-temperature molten salt reactors or fusion reactors. Studying the infiltration behavior of H2 in FLiNaK molten salt can provide the basis for the control of tritium in FLiNaK molten salt. The test system of diffusion and permeation of hydrogen isotope in molten salt is mainly used to determine the hydrogen isotope penetration in molten salt, and obtain the relevant parameters such as diffusion coefficient and solubility constant of hydrogen isotope in molten salt. Through this system, the infiltration, diffusion and dissolution of H2 in FLiNaK molten salt were studied in this paper. The experimental results show that the infiltration of H2 in the molten salt of FLiNaK is mainly hydrogen atom (or ion). At 500-700 ° C, the diffusion coefficient of H2 in the molten salt of FLiNaK satisfies the relationship of temperature: DFLiNaK-H = 1.12 × 10-4exp (-66.40 × 103 / RgT) (m2 · s-1) It can be 66.40kJ · mol-1. As for the solubility constant of H2 in FLiNaK molten salt, its relation with temperature can be described as: KFLiNaK-H = 2.1 × 10-5exp (-0.94 × 103 / RgT) (mol · m-3 · Pa-1/2) .