A modelling approach for the comparison between intensified extraction in small channels and conventional solvent extraction technologies
A modelling approach for the comparison between intensified extraction in small channels and conventional solvent extraction technologies
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DOI：
10.1016/j.ces.2019.03.074
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发表时间：
2019-08
影响因子：
4.7
通讯作者：
D. Bascone;P. Angeli;E. Fraga
中科院分区：
文献类型：
--
作者：
D. Bascone;P. Angeli;E. Fraga
本文通过模拟方法研究了小通道在乏燃料后处理抽提分离中的应用。使用文献中的模型，将结果与传统的液-液萃取技术（如混合沉降器和脉冲柱）进行了比较。在模型中考虑了传质、氧化还原反应、压降和核临界，以及小规模技术的歧管和两相分离器设计。所得到的模型作为一个优化问题，是一个混合整数非线性问题，在通用代数建模系统（GAMS）中实现。作为一个案例研究，对PUREX工艺的代码净化部分的替代流程图进行了调查。结果表明，在体积传质系数、核临界安全性和短停留时间方面，小规模技术是有益的，可以改善镎的分离，减少溶剂的降解。
In this paper, the application of small channels to the extraction separations in spent nuclear fuel reprocessing has been investigated via a modelling approach. The results are compared with conventional liquid-liquid extraction technologies such as mixer-settlers and pulsed columns, using models from the literature.In the model mass transfer, redox reactions, pressure drop and nuclear criticality are taken into account, as well as manifold and two-phase separator designs for the small-scale technology. The resulting model, posed as an optimisation problem, is a mixed integer nonlinear problem, implemented in the General Algebraic Modeling System (GAMS).An alternative flowsheet for the codecontamination section of the PUREX process, as a case study, has been investigated. The results show that the small-scale technology could be beneficial, in particular in terms of volumetric mass transfer coefficients, nuclear criticality safety and short residence time, which improves neptunium separation and reduces solvent degradation.