Extraction and Stripping Tests of Engineering-Scale Centrifugal Contactor Cascade System for Spent Nuclear Fuel Reprocessing
Extraction and Stripping Tests of Engineering-Scale Centrifugal Contactor Cascade System for Spent Nuclear Fuel Reprocessing
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用于乏核燃料后处理的工程规模离心接触器级联系统的萃取和汽提试验
DOI：
10.1080/18811248.2007.9711524
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发表时间：
2009
影响因子：
1.2
通讯作者：
Y. Nakajima
中科院分区：
文献类型：
--
作者：
M. Takeuchi;H. Ogino;H. Nakabayashi;Y. Arai;T. Washiya;T. Kase;Y. Nakajima
日本原子能机构一直在开发用于溶剂萃取的离心接触器，以应用于下一代后处理厂。离心接触器具有一些吸引人的优点，如更紧凑的设计和更短的液体停留时间比传统的接触器。在世界范围内已经进行了许多使用微型离心接触器的动力学研究。然而，有几个工程规模的研究，其中阶段的效率，浓度分布的过渡行为，以及在误操作条件下的鲁棒性进行了全面讨论的接触器级联系统。在这项研究中，我们进行了萃取和反萃的工程规模的离心接触器级联系统的基础上，流程为10公斤重/小时，使用硝酸铀酰溶液。结果表明，铀的萃取和反萃取级效率相当高，萃取级效率接近100%，反萃取级效率为97-98%。萃取段和反萃取段的铀浓度分布在10分钟内变得稳定。在萃取和汽提试验期间，在正常操作下未观察到溢流或夹带。在汽提试验期间，估计进料汽提溶液的温度从308 K升高至333 K或有机相与水相的流速比从1.0降低至0.8对应于两个接触器的分配容量。在接触器串级系统的一级电动机被故意停止的误操作试验中，表明在安装至少两个额外的级之后，系统可以保持稳定运行而不会紧急停机。
The Japan Atomic Energy Agency has been developing centrifugal contactors for solvent extraction to apply to next-generation reprocessing plants. The centrifugal contactor has some attractive advantages such as more compact design and shorter liquid residence times than conventional contactors. Many kinetic studies using a miniature centrifugal contactor have been carried out worldwide. However, there are few engineering-scale studies in which stage efficiencies, transition behavior of concentration profiles, and robustness under maloperation conditions have been comprehensively discussed for a contactor cascade system. In this study, we carried out extraction and stripping tests of an engineering-scale centrifugal contactor cascade system based on a flowsheet of 10 kg-HM/h using uranyl nitrate solution. As a result, the stage efficiencies on uranium extraction and stripping were quite high, nearly 100% for extraction and 97–98% for stripping. The uranium concentration profiles became stable within 10 minutes for both extraction and stripping sections. No overflow or entrainment was observed under normal operation during the extraction and stripping tests. During the stripping test, it was estimated that an increase in temperature of the feed stripping solution from 308 to 333K or a decrease in the flow rate ratio of the organic to aqueous phase from 1.0 to 0.8 corresponded to the distribution capacity of the two contactors. The maloperation test, in which a motor at a stage of the contactor cascade system was intentionally stopped, showed that the system could maintain stable operation with no emergency shutdown following the installation of at least two additional stages.