CO_2对活性炭捕集氙工程的影响

很多核设施会产生放射性水平较高的氙等稀有气体同位素,须经过特殊处理后才能向环境排放,研究以空气或其它气体为介质的氙的吸附净化方法具有较强的实用价值。研究了常温下多组分气体在活性炭上直接吸附时,杂质组分CO2对捕集氙效果的影响,比较了多级柱和单级柱两种方案的效果和活性炭用量,以及条件参数的影响。结果表明:相比较多级柱除杂质吸附氙的方法,单级柱直接吸附氙更易于实现工程应用;在流速约0.33cm/s下,活性炭单级柱常温常压吸附对氙捕集效率达到90%;在一定流速(0.02~1.2cm/s)范围内,可以忽略炭床阻力的影响。

Influence of CO2 on Engineering of Xenon Enrichment by Activated Carbon

Radioactive isotopes of xenon are produced in nuclear facilities, and must be trapped before released into the atmosphere. Study on the adsorption behavior of Xe isotopes in air or other gaseous medium is of great importance. For the perspective of engineering application, direct adsorption of multi-component gas at room temperature using activated carbon was studied. The comparison between multi-stage and single-stage carbon column adsorption was carried out, and the effects of condition parameters including carbon consumption were investigated. Experimental results show that single-stage carbon column is easier to be achieved in engineering application as compared with the way of multi-stage adsorbing column. For single-stage carbon column, the adsorbing efficiency of Xe reaches 90% with a gas flow velocity of 0.33 cm/s, and the resistance from the carbon bed is negligible in a certain flow velocity range (0.02-1.2 cm/s).