水-氢交换氢同位素体系HD/H2 O、DT/D2 O和HT/H2 O分离性能模拟研究

摘要

Computational simulation, as a strong and valuable complement approach to experimental study,can play a significant role in hydrogen isotope separation nowadays.In this work,a systematic study was conducted on H2 O-H2 catalytic exchange capability for hydrogen isotopes separation of HD/H2 O, DT/D2 O and HT/H2 O based on numerical modelling.The results indicate that the highest separation capability is obtained at 343 K,an optimum temperature for three systems.Additionally,the optimum temperatures decrease down to 323 K with increasing gas-liquid ratio up to 3.0,however,the HT/H2 O system show less dependence on temperature considering the lower reduction of the separation ability.The number of theoretical stages for HT/H2 O system is less than the other two ones as presenting best separation performance.The profile of hydrogen concentration along the column behaves differently for three systems under the technical conditions in this study.%计算模拟应用于氢同位素分离领域,能够方便、快捷地进行工艺条件分析。本工作采用数值模拟的方法对比研究了水-氢催化交换过程中 HD/H2 O、DT/D2 O 和 HT/H2 O 三种氢同位素体系的分离性能。研究表明：在一定工艺条件下,三种体系均在操作温度为343 K 时达到最大的分离效果；随着气液比从1.0增大到3.0,最优操作温度均从343 K降低到323 K,但是在此过程中,HT/H2 O 体系的分离效果受温度的影响较小一些；在达到最大分离效果的目标下,HT/H2 O 体系需要的理论塔板数比 HD/H2 O 和 DT/D2 O 体系少,同时,在优化的工艺条件下,三体系气相中氢同位素浓度在交换柱内分布曲线存在一定的差异。