高真空多层绝热储罐中微热型复合吸氢剂优化实验研究

Optimization and Test of Micro Thermal H_2-Adsorbent in High Vacuum Multilayer Insulation Tank

氢气是造成高真空多层绝热低温储罐夹层真空度下降的主要原因,为此搭建了吸氢试验台,研究了廉价微热型吸氢剂CuO+C在不同质量比例下的吸氢性能和吸氢过程曲线;研究表明:CuO与C的最佳质量比为1∶6.4;在最佳质量比下,经过43 h,常温夹层压力从50下降到2.2×10-2Pa,吸附了19.762 m L标态下的氢气;吸附过程曲线可分为诱导吸附期,急剧吸附期和平缓吸附期,其中,诱导吸附期随着含炭量的增加,先减小后增大;整个吸附过程曲线成反"S"型。

The low-cost micro thermal adsorbent, copper oxide and activated carbon （CuO ＋ C）, for the lab-buih test bench of H2 adsorption, because H2is one of the major residual gases in high vacuum multilayer insulation tank. The influ- ence of the mass ratio of CuO and C on the H2 adsorption was experimentally investigated. The H2 adsorption curve can be identified as the induction, rapid and slow adsorption stages. The results show that as the contents of carbon increased, the adsorption volume and average adsorption rate of H2 at room temperature changed in an increase-decrease mode in 24 and 48 h. The optimized ratio was found to be 1 ： 6.4 by data-fitting. At the optimized ratio and in the induction adsorption stage,the pressure dropped from 50 Pa down to 10-2 Pa and H2 adsorption volmrre in standard state rose up to 19.762 mL in 43 h.