贮氚老化对钯氢化物氢氘交换影响的色谱理论模拟

Chromatography Theory Simulation of Tritium Aging Effect in Hydrogen Deuterium Exchange between Gaseous Hydrogen and Palladium Hydride Powder

摘要:

利用色谱分离的速率理论分析了贮氚老化影响钯氢化物中恒流速氢氘交换性能的原因，并利用塔板理论模拟了氢氘交换流出曲线，同时，实验对比了未贮氚老化与贮氚老化1.6年钯的氢氘交换流出曲线。理论模拟结果表明：贮氚老化后，钯氢化物氢氘交换反应的塔板数n减少，塔板高度H增加，交换反应的平衡时间增长，氢氘交换流出曲线趋于平缓，氢氘交换性能下降。而塔板高度的增加，是由于衰变3He滞留在钯材料中，导致氢同位素在老化钯中的扩散受阻，同时使得钯的氢同位素分离因子改变。实验对比结果表明：恒流速状态下，贮氚老化1.6年钯的氢氘交换流出曲线较之未贮氚老化钯变得平缓，氢氘交换性能下降。理论模拟与实验结果符合较好。

Abstract:

In order to research the tritium aging effect in hydrogen deuterium exchange at a constant flow rate between gaseous hydrogen and palladium hydride powder, the reasons that affect exchange performance were analyzed by speed theory of chromatography separation, and the breakthrough curves of the exchange reaction were simulated by plate theory. And, hydrogen deuterium exchange experiments over 0 year and 1.6 years aged palladium were compared. The theoretical simulation results indicate that in aged palladium, the plate number of exchange reaction is decreased, the plate height is increased, the equilibration time of exchange reaction is prolonged, the breakthrough curves become smooth, and the exchange performance declines. The plate height increasing is due to decay product 3He, which accumulate and cumber hydrogen isotope diffusion in aged palladium; further more, because of the existence of 3He, the hydrogen isotope separation factor of aged palladium changes. The comparison results indicate that the hydrogen deuterium exchange breakthrough curve of 1.6 years aged palladium go smooth, and the hydrogen deuterium exchange performance declines at a constant hydrogen flow rate. The theoretical simulation results accord with the experiment results.