绕管式换热器壳侧汽化模拟时的液滴粒径研究  

Study on liquid particle diameter during simulating vaporization of spiral wound heat exchanger shell-side

作　　者：吴志勇 张安昊 国慧敏 建伟伟 蔡伟华[2] Wu Zhiyong;Zhang Anhao;Guo Huimin;Jian Weiwei;Cai Weihua(School of Petroleum and Natural Gas Engineering,Liaoning Shihua University,Fushun,Liaoning,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin,Heilongjiang,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院 [2]哈尔滨工业大学能源科学与工程学院

出　　处：《石油与天然气化工》2020年第1期49-56,共8页Chemical engineering of oil & gas

基　　金：辽宁省博士科研启动基金指导计划项目“LNG绕管式换热器流动与换热机理研究”(20170520031);辽宁石油化工大学引进人才科研启动基金资助

摘　　要：使用ANSYS CFX软件下的欧拉模型对绕管式换热器壳侧乙烷剪切汽化流动进行了数值模拟,对控制方程组中影响相间作用的离散相液滴粒径展开了研究。从能量守恒角度推导出离散液相平均粒子直径公式,通过引入热相变比参数得以简化计算液相平均粒子直径,实现对壳侧剪切流汽化换热过程准确模拟,换热模拟偏差在±20%范围内。壳侧冷剂入口干度和工作压力是影响热相变比的主要因素,以入口干度和汽相密度为自变量对热相变比进行公式拟合,给出了适用于变工况下的热相变比计算式。The Euler model that attaches to the ANSYS CFX software is used to simulate the ethane shear and vaporizing flow on the shell-side of spiral wound heat exchanger(SWHE).The diameter of the disperse liquid particle that influences the phase interactions in the governing equations is investigated.Based on the energy conservation,formula for the average diameter of the disperse liquid particle is deduced.The heat ratio of phase change is proposed to compute simply the liquid particle average diameter so that the shear and vaporizing flow on the shell-side of SWHE could be simulated accurately and within the deviation of±20%.The heat ratio of phase change is mainly influenced by the shell-side operating parameters including inlet quality and pressure,hence a formula of the heat ratio of phase change is fitted by both shell-side inlet quality and vapor density variables.The formula of the heat ratio of phase change is also applicable under different conditions such as mass velocity and heat flux variation.

关 键 词：绕管式换热器 剪切流 汽化换热 平均粒子直径 热相变比 

分 类 号：TE965[石油与天然气工程—石油机械设备]