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介绍了重水提氚工艺中色谱分离系统的尾气处理方法,即从氦气中去除氢同位素的方法,着重介绍了适合目前处理量、适合闭环运行的催化氧化法及低温吸附法。实验数据显示,催化氧化法在没有外加空气或氧气的情况下,几乎不能去除氦中的氢,在外加一定流量空气的情况下,可以得到99.99%~99.999%的高纯氦;其缺点是必须加氧或加空气,不仅增加了处理过程及设备的复杂性,而且不可避免地会将过量的氧气或空气留在氦气中,因此氦如果要循环使用还需要进一步除氧。而低温吸附法处理后的氢气中约含1%~2%的氦气,满足下一级氢氧复合的要求,但在低温吸附的过程中及解吸初期释放出的氦气中含氢量约1%,达不到作载气的要求,因此必须经过下一级处理,如低温吸附或经过消氢催化剂。
The tail gas treatment method of chromatographic separation system in the process of heavy water extraction and tritium removal is introduced, that is, the method of removing hydrogen isotope from helium gas is introduced. The catalytic oxidation method and the low temperature adsorption method suitable for the current treatment capacity and closed loop operation are emphatically introduced. The experimental data show that the catalytic oxidation method can hardly remove the hydrogen in helium without adding air or oxygen, and can obtain 99.99% -99.999% of high-purity helium with a certain flow of air; the disadvantage is that it is necessary Adding oxygen or adding air not only increases the complexity of the process and equipment, but it also inevitably leaves excess oxygen or air in the helium, so further oxygen needs to be removed if helium is to be recycled. However, the hydrogen treated by the cryogenic adsorption method contains about 1% -2% of helium to meet the requirement of the next level of hydrogen and oxygen recombination. However, the hydrogen content in the helium released during the low temperature adsorption and initial desorption is about 1%, can not reach the carrier gas requirements, it must go through the next level of treatment, such as low temperature adsorption or after the hydrogen-removing catalyst.