液态锂中氘脱附特性分析

Characteristic Analysis of Deuterium Desorption in Liquid Lithium

锂化壁处理/液态锂第一壁可为托卡马克装置提供良好壁条件,但存在燃料滞留问题,为解决这一问题,需进一步研究氢同位素在液态锂中的脱附特性。本文设计了液态锂中气体吸附/脱附系统,开展了氘气在液态锂中的吸附实验,并分析了其脱附过程,通过采用微调阀调整进气速率的方式标定不同氘气分压下的系统抽速,计算了热脱附过程中气体的抽除量。结果表明,氘气在液态锂中的脱附峰温度在481℃附近,脱附的氘气仅有约36%被抽气系统抽除,剩余部分被壁面冷凝的锂重新吸附。该研究可为深入分析氘在液态锂中的脱附行为奠定良好基础,为未来解决液态锂中的燃料回收问题提供技术支持。

Lithium coating or liquid lithium provides good wall condition for Tokamak, but it has the problem of fuel retention.In order to solve this problem, it is necessary to focus on the desorption properties of hydrogen isotopes in liquid lithium. In this paper, the adsorption/desorption system of liquid lithium was designed, the absorption experiment of deuterium in liquid lithium was carried out and the desorption process was analyzed. The system pumping speed under different partial pressures of deuterium was calibrated by using a fine-tuning valve to adjust the air inlet rate, and the amount of gas pumped from the system during desorption process was calculated. The results show that the desorption peak temperature of deuterium is around 481 ℃, only about 36% of the desorbed deuterium gas was pumped out by the extraction system, and the rest of them was re-adsorbed by lithium condensed on the wall. This study lays a good foundation for further analysis of the desorption behavior of deuterium in liquid lithium, and provides technical support for solving the problem of fuel recovery in liquid lithium in the future.