稳定同位素~(13)C分离用高效丝网波纹填料表面降膜流动研究

由于碳同位素分离系数小,分离难度大,需要采用高效规整填料实现~(13)C的分离。本文通过计算流体力学(CFD)数值模拟研究,采用流体体积函数(VOF)方法,研制了用于~(13)C分离的高比表面积丝网波纹规整填料(PACK-~(13)C),建立了PACK-~(13)C填料表面伴随有气相逆流的局部液体降膜流动模型,选用CO(l)-CO(g)为模拟计算物系,考察了板面结构、丝网目数等因素对液膜流动的影响,并对填料表面气液相界面进行追踪,探究了气液相界面波动对传质效率的影响,研究表明,改善填料壁面结构能够增强气液相界面波动,可以实现强化传质过程。填料表面局部降膜流动的研究方法,可应用于填料气液传质过程中涉及的多尺度流动及传质现象的可视化研究,为优化填料结构提供基础性理论指导。

Local Falling Film Flow Study of Mesh Corrugated Packing Used in the Separation of Stable Isotope 13 C

The separation coefficient of carbon isotopes is small ,high-efficiency struc-tured packing should be used in the separation of 13 C . So the self-developed high-efficiency structured packing PACK-13 C was put forward .By means of computational fluid dynamics (CFD) ,a local falling film flow of mesh corrugated packing PACK-13 C with the gas phase counter-current model using the volume of fluid (VOF) was presen-ted .CO(l)-CO(g) was selected to be the simulation mixtures .Based on the simulated results ,the influences of the plate structures and the mesh sizes on the film flow were investigated .Based on the gas-liquid interface tracking timely ,the influence of interface fluctuation on the mass transfer efficiency was also investigated . The results showed that improving the wall structures to enhance the interface fluctuation was the effective way to strengthen the mass-transfer efficiency .The method of local falling film flow study could be applied to research the multi-scale flow and mass-transfer behavior of the packing w hich provide some theoretical guidance about the optimization of the packing ’s structures .