液态锂铅合金的氚释放行为

Behavior of Tritium Release from Liquid LiPb Alloy

为了完成聚变堆液态锂铅包层鼓泡提氚系统的工程设计和建造,以金属与氢的作用理论为基础,建立了氚从液态锂铅中的动力学释放行为的数学模型。计算和分析了温度、饱和器氚分压、氦流量对解吸器顶部气相中的氚分压的影响以及氚在液态锂铅中的传质系数、解吸率和吸附率。结果表明:在633～723K的解吸温度范围内,氚从液态锂铅到气相的整个释放过程虽然包含了氚在熔融合金气泡中的扩散与对流、氚通过与气-液界面相连合金层的扩散、在界面发生的氚原子重组多相反应、氚通过气相边界层的扩散和气相中氚的扩散与对流5个子过程,但起决定作用的是氚在合金内的扩散和气-液界面的多相反应重组,其他子过程意义不大。

The liquid lithium lead alloy is a prominent breeder material for the fusion reactor tritium blanket. For an effective calculation of the knowledge of kinetics of tritium release behavior from liquid LiPb alloy, a mathematical model is built by taking into consideration the theory of metals and hydrogen and the design of the bubble tritium extraction system from the liquid Lithium-Lead module for fusion reactor. The calculation data of tritium release-behavior from liquid LiPb under different operating conditions of temperature and tritium partial pressures and helium gas flow-rates and mass transfer coefficients are obtained. These results have shown that the overall release process, even though including five sub-processes （transport of the tritium by diffusion and convection, transport of the tritium by diffusion through a layer of eutectic adjacent to the gas-eutectic interface, heterogeneous reaction at the interface of the tritium atoms recombination, diffusion of the tritium through the gas-phase boundary layer, transport of the gaseous tritium by diffusion and convection from the gas phase boundary layer）, is governed by the diffusion of tritium atoms in the LiPb and by the heterogeneous reaction at the gas-eutectic interface of the tritium atoms recombination in the desorptiong temperature vary from 633 to 723K,