低温流体在不同倾角填料表面的气液逆流特性理论研究  

Study on gas-liquid counter-current characteristics of cryogenic fluids on surfaces of structured packings with different inclination angles

作　　者：詹高铭 植晓琴[1] 滕艺璇 周华彬 邱利民[1] Zhan Gaoming;Zhi Xiaoqin;Teng Yixuan;Zhou Huabin;Qiu Limin(Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学制冷与低温研究所,杭州310027

出　　处：《低温工程》2024年第3期1-7,55,共8页Cryogenics

基　　金：国家自然科学基金面上项目(NO.52176024)。

摘　　要：采用CFD方法,建立规整填料局部逆流模型,通过分析流动形态、润湿率、持液率等参数,研究了低温氮氧在45°和60°倾角填料气体逆流对流动特性的影响。结果表明,逆流气体对常温水的润湿性有促进作用,对低温工质产生负面影响。对于低温流体,45°填料能提供高于86%的润湿面积,逆流气体影响下润湿率降低6.90%,而60°填料润湿率仅降低0.40%,但其润湿率仅约67%。60°填料的压降低于50 Pa/m,远低于45°填料,能有效降低压降损失,更适合用于大处理量的空分精馏过程。The computational Fluid Dynamics(CFD)method is employed to establish a model for local counter-current flow in structured packing.Through the analysis of flow patterns like wetting rates,liquid holdup,the study examines the impact of counter-current gas flow on the flow characteristics of cryogenic nitrogen-oxygen on 45°and 60°inclined packings.The results in-dicate that counter-current gas promotes the wettability of water at ambient temperature but has a negative effect on cryogenic working fluids.For cryogenic fluids,45°packing provides more than 86%wetted area,with the wetting rate decreasing by 6.90%under the influence of counter-cur-rent gas,while the wetting rate for 60°packing decreases only by 0.40%,but its wetted area is approximately 67%.The pressure drop for 60°packing is less than 50 Pa/m,significantly lower than the 45°packing,effectively reducing the pressure drop losses,making it more suitable for the cryogenic distillation process of large processing system.

关 键 词：低温精馏 规整填料 气液逆流 数值模拟 

分 类 号：TB611[一般工业技术—制冷工程]