基于CFD的渗透汽化膜分离技术研究进展

Research process of computational fluid dynamics in pervaporation membrane separation

渗透汽化膜分离技术具有低能耗、高分离效率、设备简单等优势,广泛应用于化工、能源等领域.计算流体力学(CFD)模拟以其低成本、可视化等优点为渗透汽化技术发展提供了重要辅助.本文综述了CFD在渗透汽化膜分离过程中的研究进展,并对相关的模拟方法进行了分析与对比.根据简化的传质过程将模拟方法分为拟一级反应法、对流扩散法、质量跳跃法、膜内扩散法.基于此,归纳了操作温度、渗透压强、进料组分、进料流速、膜厚度等相关参数对渗透汽化影响机理,并进一步总结了近年来膜组件结构优化对膜组件流场的影响,展示了CFD技术在渗透汽化领域内的应用潜力.提出了面对未来发展,需要结合最新的传质理论与耦合分子模拟等技术进一步提升模拟精度,并在膜组件结构优化与新型湍流促进器等方面进行探索的建议,以便于实现工业规模应用.

Pervaporation has the advantages of low energy consumption,high separation efficiency,simple equipment,which is widely used in chemical,energy,environment and other fields.Computational fluid dynamics(CFD)plays an important supporting role in the further development of pervaporation technology with its advantages of low cost and short time consumption.In this paper,the research progress of CFD in pervaporation membrane separation process is summarized,and the related simulation methods are analyzed and compared.According to the simplified mass transfer process,the simulation methods are divided into pseudo-chemical reaction method,convection-diffusion method,mass jump model method and intramembrane diffusion method.Based on this,the influence mechanism of operating temperature,osmotic pressure,feed composition,feed velocity,film thickness and other related parameters on pervaporation was summarized,and the influence of membrane component structure optimization on membrane component flow field in recent years was further summarized,demonstrating the application potential of CFD technology in the field of pervaporation.Finally,it is pointed out that in the face of future development,it is necessary to combine the latest mass transfer theory and coupled Molecular Simulation to further improve the simulation accuracy.The optimization of membrane module and new turbulence promoters are still needed for industrial applications.