钯柱内氢同位素排代计算机模拟

利用气-固相氢同位素交换模型，对钯柱上的氢同位素排代进行了计算机模拟。计算了氕排代氘、氘排代氕以及氘排代氚过程中钯柱流出端氢同位素各组分丰度随流入气量的变化关系，研究了氢同位素分离因数、比表面积以及排代柱长度对排代效果的影响。结果表明：根据数学模型获得的排代流出曲线与实验结果具有很好的一致性；增大材料的比表面积，可以显著地改善排代效果；对于具有正氢同位素效应的金属．氢体系，排代效果与分离因数关系密切：分离因数越大，排代效果越好；氘排代氕以及氘排代氚的效果均不如氕排代氘；在所涉及的范围内，当体积流速恒定，排代柱的长度对排代效果没有影响。

Simulation of Displacement between Hydrogen Isotopes in Palladium Column

Displacement between hydrogen isotopes in palladium column was simulated by use of model of isotope exchange between gas and solid phases. Abundance of hydrogen isotopes exiting palladium column during deuteride to hydride, hydride to deuteride and tritide to deuteride displacement processes were calculated, and influences of separation factor, specific area and column length on displacement were studied. Results show that data calculated agree with experimental ones. Increasing specific area of palladium can improve displacement effect significantly. For metal hydrogen system with positive isotopic effect, displacement effect increases with separation factor. Displacement effect of deuteride to hydride process is better than those of hydride to deuteride and tritide to deuteride. Column length has no influence on the effect while volumetric velocity of flow keeps constant.