Study on Isotope Enrichment of Nitrogen-15 with Cascading Assembly of Thermal Diffusion Columns

热扩散柱级联富集氮15同位素研究

• 批准号: 09480098
• 负责人: YAMAMOTO Ichiro
• 金额: $ 7.62万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09480098/
• 关键词: Isotope Separation; Thermal Diffusion; Thermal Diffusion Column; Cryogenic; Nitrogen Isotopes; Nitrogen-15; Computer Simulation; Numerical Analysis

A numerical simulation system was developed to analyze isotope separation performance in the thermal diffusion column for nitrogen isotope separation. Hydrodynamic flow in the thermal diffusion column was numerically simulated and mole fractions of nitrogen molecules of mass numbers, 28, 29 and 30 were computed as function of vertical and radical positions by solving a convective diffusion equation. The thermal diffusion factor, which is most important value in the analysis, was expressed in a practical form, still keeping consistent relationship with generalized Stefan-Maxwell equation, applicable to multi-component mixture of nitrogen isotopes. In our study, the effect of inelastic collision of nitrogen molecules was considered to the thermal diffusion factor. The effect of cold wall temperature on separation performance for ィイD114ィエD1N-ィイD115ィエD1N and ィイD114ィエD1NィイD22ィエD2 separation was evaluated with the numerical simulation system and compared with experimental results with the thermal diffusion column of an effective height of 950mm, a hot wire of 0.15mm in radius and a cold wall of 5.0mm in radius. The solutions numerical analyses gave good reproduction of dependence of separation factors on cut and cold wall temperature.Studied as a design example was cascade composed with an assembly of thermal diffusion columns of an effective height of 10m. The number required for a series of stages of the thermal diffusion column was 5 so as to achieve the final enrichment of 99.9% of ィイD115ィエD1N. The total number of the thermal diffusion columns was evaluated 89,600 in a plant which produces ィイD115ィエD1N to meet the demand for UN fuel of one fast breeder reactor of 1 GW electric power in a year.

开发了一个数值模拟系统来分析氮同位素分离热扩散柱的同位素分离性能。数值模拟了热扩散塔中的流体动力学流动，并通过求解对流扩散方程计算了质量数为28、29和30的氮分子的摩尔分数随垂直位置和径向位置的变化。分析中最重要的值热扩散因子以实用的形式表示，仍然与适用于氮同位素多组分混合物的广义Stefan-Maxwell方程保持一致的关系。在我们的研究中，考虑了氮分子的非弹性碰撞对热扩散因子的影响。利用数值模拟系统，在有效高度为950 mm、热线半径为0.15mm、冷壁半径为5.0mm的热扩散塔中，研究了冷壁温度对D114-D115-D11 N和D114-D1 N-D22-D2分离性能的影响，并与实验结果进行了比较。数值分析结果很好地再现了分离因子对切割温度和冷壁温度的依赖关系，并以有效高度为10 m的热扩散柱组合叶栅为设计实例进行了研究。热扩散柱的一系列阶段所需的数量为5，以实现最终富集99.9%的H2O D115 H2O D1 N。热扩散塔的总数量估计为89，600，在一个工厂，生产1000吨D115吨D1 N，以满足联合国燃料的需求，一个快中子增殖反应堆的1吉瓦电力在一年。

项目成果

H. Yamakawa: "Inverse Power Series Fittings of Temperature Dependence of Thermal Diff usion Factors between Two Components of Hydrogen Isotope Molecules" Journal of Nuclear Science and Technology. 35(in press). (1998)

H. Yamakawa：“氢同位素分子两个组分之间热扩散因子温度依赖性的逆幂级数拟合”核科学与技术杂志。

H. Yamanaka et al.: "Thermal Diffusion Factor for Diatomic Gas Mixture in Multicomponent System"Journal of Nuclear Science and Technology. 2000 (in press). (37)

H. Yamanaka 等人：“多组分系统中双原子气体混合物的热扩散因子”核科学与技术杂志。

H. Yamanaka et al.: "Inverse Power Series Fittings of Temperature Dependence of Thermal Diffusion Factors between Two Components of Hydrogen Isotope Molecules"Journal of Nuclear Science and Technology. 35. 234-239 (1998)

H. Yamanaka 等人：“氢同位素分子两个组分之间热扩散因子温度依赖性的逆幂级数拟合”核科学与技术杂志。

H. Yamanaka et al.: "Effect of Gravity and Inter-molecular Forces on Separation Performances of "Cryogenic-wall" Thermal Diffusion Column"Fusion Engineering and Design. 39/40. 1015-1020 (1998)

H. Yamanaka 等人：“重力和分子间力对“低温壁”热扩散柱分离性能的影响”聚变工程与设计。