LNG冷能发电中间介质气化器丙烷管外凝结数值模拟  

Numerical simulation on the condensation characteristics outside the tube in intermediate fluid vaporizer for LNG cold energy power generation

作　　者：李亚松 黄涛 林文胜[2] Li Yasong;Huang Tao;Lin Wensheng(Shandong Town gas Group Co.Ltd.,Jinan 250101,China;Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]山东港华燃气集团有限公司,济南250101 [2]上海交通大学制冷与低温工程研究所,上海200240

出　　处：《低温与超导》2024年第1期49-57,共9页Cryogenics and Superconductivity

基　　金：上海市重点科技攻关专项(072112013)资助。

摘　　要：本文以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,通过建立相应数值模型,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。分析了冷凝器丙烷端管外液膜流动和凝结换热特性,将管外换热系数的模拟值与Nusselt公式理论解进行对比,偏差在10%以内,证明了该模型对模拟冷凝器中丙烷管外凝结过程的准确性。此外,还将该IFV中丙烷端凝结换热特性与常规IFV进行了对比,发现在较小壁面过冷度时,该IFV管外换热系数要明显小于常规IFV。In this study,the condensation process of the propane outside the tube in the condenser unit of the intermediate fluid vaporizer 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 simulation value of heat transfer coefficient outside the tube was compared with the theoretical solution of Nusselt formula.The deviation was less than 10%,which proved the accuracy of the model for simulating the condensation process of the propane outside the tube in the condenser.In addition,the condensation heat transfer characteristics of the propane in the IFV were compared with that of the conventional IFV,and it was found that the heat transfer coefficient outside the tube of this IFV is significantly lower than that of the conventional IFV when the wall subcooling degree is small.

关 键 词：IFV冷凝器 两相流 相变模拟 膜状凝结 

分 类 号：TK124[动力工程及工程热物理—工程热物理]