Zr_(30)Ni_(70)合金水分解反应性能研究

Study on the water decomposition reaction by Zr_(30)Ni_(70) alloy

针对ITER HCCB-TBM氚提取系统氚化水分解处理需求,考察了Zr_(30)Ni_(70)合金在500℃下的吸氢特性和水分解反应前后的物相变化,并采用微型固定床反应器考察了不同粒度合金在500℃下对惰性气体中微量水的分解反应性能。结果表明,Zr_(30)Ni_(70)合金吸氢量极低,满足Sievert定律;合金水分解的有效成分是Zr,反应产物为ZrO_2;合金粉体粒径越小,床层水分解的穿透容量越大;粉体造粒后可兼顾低床层压降和高穿透容量;水蒸汽浓度变化对穿透容量基本无影响,氢含量低于1%时对穿透容量无影响;当造粒颗粒床层高度超过120mm,床层利用率>98%。

In order to fulfill the requirement of tritiated water decomposition in tritium extraction system in ITER HCCB-TBM, Zr30 Ni70 was selected and the following performances at 500 ℃ were investigated： hydrogen absorption property, phase transformation in water decomposition process and trace water decomposition reaction in micro fixed-bed reactor. The results showed that the hydrogen absorption in alloy obeys to Sievert law with very low capactity, the effective element in alloy for water decomposition is Zr and the product is ZrO2. The breakthrough capacity increased with the decrease of powder size, the granulation of powder with 400 mesh size could guarantee both high breakthrough capacity and low pressure drop, the breakthrough capacity didn＇t change with the variety of water concentration and with the hydrogen concentration less than 1%, the utilization rate of bed exceeded 98%with the packing height larger than 120 mm.