管束排列方式对LNG冷能发电中间介质气化器丙烷管外凝结影响分析  

Analysis of Influence of Tube Bundle Arrangement on the Condensation Characteristics outside the Tube in Intermediate Fluid Vaporizer for LNG Cold Energy Power Generation

作　　者：黄涛 林文胜[1] 许婧煊 HUANG Tao;LIN Wensheng;XU Jingxuan(Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai 200240,China;Institute of Refrigeration and Cryogenics,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海交通大学制冷与低温工程研究所,上海200240 [2]上海理工大学制冷与低温工程研究所,上海200093

出　　处：《真空与低温》2024年第2期188-195,共8页Vacuum and Cryogenics

基　　金：上海市重点科技攻关专项(072112013)。

摘　　要：以LNG冷能发电装置中的中间介质气化器中冷凝器丙烷管外凝结过程为研究对象,建立相应数值模型,采用VOF模型追踪气液相界面,利用LEE模型作为相变传热传质模型,对管外气态丙烷凝结成液膜流动及凝结传热问题进行了瞬态二维CFD模拟。分析了不同管束排列方式下冷凝器丙烷端管外液膜流动和凝结换热特性,并对管外平均换热系数的模拟值进行了相应的计算。此外,还分析了壁面过冷度对丙烷冷凝相变过程的影响,发现在壁面过冷度较大时,顺排和叉排结构中最底排管道处皆出现了气体回流现象,导致最底排的管道最先出现液滴。The condensation process of the propane outside the tube in the condenser unit of the Intermediate Fluid Vaporizer(IFV)which is suitable for LNG cold energy generating device was examined.By establishing the corresponding numerical model,the VOF model was used to trace the gas-liquid phase interface,and the LEE model was used as the phase change heat and mass transfer model.The transient two-dimensional CFD simulation was carried out on the liquid-film flow and condensation heat transfer of gaseous propane outside the tube.The flow and condensation heat transfer characteristics of the liquid film outside the propane of the condenser under different tube bundle arrangements were analyzed,and the simulated value of the average heat transfer coefficient outside the tube was calculated.In addition,the effect of wall subcooling on the phase transition of propane condensation was also analyzed.It was found that gas backflow occurs in the bottom discharge pipe of both the straight discharge and the fork discharge structure at a large wall supercooling degree,resulting in the first drop in the bottom discharge pipe.

关 键 词：IFV冷凝器 两相流相变模拟 膜状凝结 管束排列方式 

分 类 号：TB657.8[一般工业技术—制冷工程]