基于微通道低温精馏技术的丙烯/丙烷混合物分离CFD模拟  

CFD Simulation of Propylene/Propane Mixture Separation with Cryogenic Microchannel Distillation Technology

作　　者：侯钰 王舟[2,4,5] 巨永林 王刚[6] 刘锴 HOU Yu;WANG Zhou;JU Yonglin;WANG Gang;LIU Kai(Paris Elite Institute of Technology,Shanghai Jiao Tong University,Shanghai200240,China;Institute of Particle and Nuclear Physics,Shanghai Jiao Tong University,Shanghai200240,China;Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai200240,China;Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai200240,China;Sichuan Research Institute,Shanghai Jiao Tong University,Chengdu610213,China;Shanghai Zhongyuan Haowei New Material Technology Co.,LTD,Shanghai200240,China)

机构地区：[1]上海交通大学巴黎卓越工程师学院,上海200240 [2]上海交通大学粒子与核物理研究所,上海200240 [3]上海交通大学制冷与低温工程研究所,上海200240 [4]上海交通大学李政道研究所,上海200240 [5]上海交通大学四川研究院,成都610213 [6]上海中元浩微新材料科技有限公司,上海200240

出　　处：《真空与低温》2024年第2期148-156,共9页Vacuum and Cryogenics

基　　金：国家自然科学青年基金(52206015)。

摘　　要：针对相对挥发度低、难以分离的混合物的低温精馏分离过程,建立了一套基于微通道精馏(MCD)的CFD模型并开展了深入的模拟研究。通过多物理场耦合,实现了对丙烯/丙烷两相流在微通道精馏设备内部相变传热和精馏传质过程的模拟。基于麦克斯韦-史蒂芬扩散模型,对不同温度、摩尔浓度条件下混合物的传质系数进行模拟计算。模拟结果显示经过3.8 mm的微通道精馏设备,可在170 kPa条件下对冷端235 K、热端239 K的液态丙烯/丙烷混合物进行高效分离,将产品丙烷的浓度由1%提升至2.1%。对模拟结果进行了优化分析,得到了结构、流场和温度对精馏传质效率的影响。研究成果对微通道低温精馏系统的精馏效率提高具有指导意义。A CFD model based on MicroChannel Distillation(MCD)was built to simulate the separation process of mixtures with low relative volatility.The heat and mass transfer process of propylene/propane two-phase mixture flow in MCD equipment was simulated by multi-physics coupling.The mass transfer coefficients of mixture at different temperatures and molar concentrations were simulated based on the Maxwell-Stephan diffusion model.The results show that the liquid propylene/propane mixture with cold-end 235 K and hot-end 239 K can be efficiently separated under the condition of 170 kPa with 3.8 mm MCD equipment,and the propane concentration of the product can be increased from 1%to 2.1%.The effects of flow field,temperature and structure on the heat and mass transfer efficiency of distillation were obtained.This re-search has important guidance for improving the efficiency of cryogenic MCD system.

关 键 词：低温精馏 微通道精馏 流场模拟 气液分离 传热传质 

分 类 号：TB657[一般工业技术—制冷工程] TQ028.13[化学工程]