电解-精馏级联分离H_2/HD过程的理论分析

Theoretical Analysis of H_2/HD Separation Performance by Electrolysis-distillation Process

为研究电解精馏级联氢同位素分离过程的规律性,建立了电解-精馏级联的微分模型,计算了H2/HD系统的分离行为,并获得了电解和精馏过程中系统的浓集行为,即,电解池中HDO摩尔分数从2.88×10-4增长到8.35×10-4,精馏柱再沸器中HD摩尔分数达到0.033。随时间的延长,脱氘率下降,在精馏柱上HD的摩尔分数整体抬升。进一步研究了回流比对脱氘率的影响,结果显示,回流比为3～7时,平均脱氘率可达0.982 8～0.997 3。实验结果表明,电解-精馏级联分离氢同位素有明显的浓集效应。

A differential model was established to study the separation of hydrogen isotopes by electrolysis-distillation process, and separation performance of H2/HD was investigated. Enrichment behavior of both electrolysis and distillation was obtained： HDO concentration in electrolysis increased from 2.88 × 10^-4 to 8.35 ×10^-4 , HD concentration in reboiler finally reached 0. 033. As enrichment developed, deuterium extraction efficiency decreased with time while HD concentration along distillation column increased. The reflux rations effect on deuterium extraction efficiency was also studied, deuterium extraction efficiency was between 0. 982 8 and 0. 997 3 with reflux ratio between 3 and 7. The results indicate that the concentrated effect is obvious by elctrolysis-distillation process on the separation of hydrogen isotopes.