| 摘要 |
<p>1507694 Separating gases KERNFORSCHUNGSANLAGE JULICH GmbH 2 June 1975 [1 June 1974] 23835/75 Heading F4P Krypton and xenon are separated from each other and from a waste gas generated by the chemical solution of nuclear fuel particles and/or fertile material by: (a) mixing an inert carrier gas, e.g. helium, with the waste gas in the chemical dissolver 1; (b) cooling the mixture at 6 so as to precipitate out the xenon; and (c) separating out the krypton at 11, 12 from the residual gas mixture. Nuclear fuel particles and helium via duct 3 are simultaneously supplied via chamber 2, which has a conveyer for the particles, to the dissolver 1. The gas mixture is fed via duct 4 to a compressor 15 with a by-pass control duct 16, and then to alternating regenerative purifiers 5, 5<SP>1</SP> to remove O 2 , CO 2 , NO 2 , hydrocarbons and water vapour, before passing via exchanger 7 to a cooling vessel 6 in which xenon is solidified. Residual gas passes back through exchanger 7, is compressed at 8 to about 5 bars, and then passes to cooling vessel 11 where krypton solidifies, further krypton being separated in activated charcoal adsorber 12. Cooling vessels 6, 11 and adsorber 12 are all cooled by liquefied nitrogen at its boiling point, all three containers being mounted with identical containers connected in parallel for alternating regenerative use in a common vacuum-insulated vessel (Figs. 2 to 6, not shown). The precipitated xenon in vessel 6 is heated and passed to rectification column 27 during the regeneration phase. Column 27 separates out the small quantition of krypton still present in the xenon.</p> |
