CFD Simulation of Propylene/Propane Mixture Separation with Cryogenic Microchannel Distillation Technology
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 tempera-tures and molar concentrations were simulated based on the Maxwell-Stephan diffusion model.The results show that the li-quid 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.
cryogenic distillationmicrochannel distillationCFD simulationgas-liquid separationheat and mass transfer
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万方数据
维普
