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    • 4. 发明授权
    • Process for treating waste gas in reprocessing of used nuclear fuel
    • 用于处理废气的废气的处理方法
    • US4482479A
    • 1984-11-13
    • US428386
    • 1973-12-26
    • Kunio KamiyaHideo YusaFumito NakajimaMasato Takeuchi
    • Kunio KamiyaHideo YusaFumito NakajimaMasato Takeuchi
    • B01D53/34G21F9/02
    • G21F9/02
    • A waste gas generated in the reprocessing of used nuclear fuel is at first subjected to removal of explosive, gaseous substances such as hydrocarbons and nitrogen oxides, and materials capable of forming the explosive gaseous substances, such as oxygen, and condensible substances such as carbon dioxide, water and ammonia from the waste gas, and then to cryogenic distillation, thereby separating and recovering Kr-85 from the waste gas. As the separation and recovery of Kr-85 is carried out by cryogenic separation after the removal of the substances having a possibility to explode in a cryogenic distillation apparatus and also the removal of condensible substances having a possibility to clog a piping system of the apparatus, the operation of the apparatus is ensured. It is also disclosed that the oxygen and nitrogen oxides can be completely removed by catalytic hydrogen reduction.
    • 首先对废旧核燃料的后处理中产生的废气进行除去爆炸性气体物质如碳氢化合物和氮氧化物,以及能形成诸如氧气等爆炸性气体物质的物质,以及二氧化碳等可冷凝物质 ,来自废气的水和氨,然后进行低温蒸馏,从而从废气中分离并回收Kr-85。 由于在除去在低温蒸馏装置中可能爆炸的物质之后通过低温分离进行Kr-85的分离和回收以及除去可能堵塞设备的管道系统的可冷凝物质, 确保设备的操作。 还公开了氧和氮氧化物可以通过催化氢还原完全除去。