摘要
液氢在管道输送过程中极易发生气液两相流现象,严重影响液氢输送系统的安全性和高效性。针对这一问题,建立液氢管道三维数值模型,分析液氢管道主要传热结构,优选合适的支撑与管道接头形式,并探究液氢管道流动特性,着重分析入口流速、入口压力等工艺参数对液氢管道截面含气率和温升的影响规律。结果表明:三角形支撑与Bayonet接头的绝热效果较优;液氢管道输送过程中截面含气率随入口流速的增大先减小后增大,存在最佳入口流速,针对内管Φ32 mm的液氢管道,最佳入口流速为4 m/s;液氢管道入口压力增大,截面含气率减小,也可有效降低液氢温升。在液氢管道工艺设计和工程应用中应确定合理的入口流速和压力,以确保液氢管道安全高效运行。
Liquid hydrogen is prone to form gas-liquid two-phase flow during pipeline transportation,which seriously affects the safety and efficiency of the system.To address this problem,this paper establishes a three-dimensional numerical model of the liquid hydrogen pipeline,to analyze the main heat transfer processes,and optimize the form of support and pipeline joint.At the same time,the flow characteristics of the liquid hydrogen pipeline are investigated,and the influence of process parameters such as inlet flow rate,pressure on the gas holdup and temperature increase of the liquid hydrogen pipeline cross-section is analyzed.The results show that the triangular support and Bayonet joints have the best insulation ef-fect.During the transportation of liquid hydrogen,the gas holdup of the pipeline cross-section decreases and then increases with the increase of inlet flow rate.The optimum inlet flow rate for a liquid hydrogen pipeline with a diameter of Φ32 mm is 4 m/s.An increase in the inlet pressure of liquid hydrogen reduces the gas holdup of the cross-section and can effectively re-duce the temperature rise of liquid hydrogen.Reasonable inlet flow rates and pressures should be determined iniquid hydro-gen pipeline process design and engineering applications to ensure safe and efficient operation of the liquid hydrogen trans-portation system.
作者
刘凯
陈叔平
赵国锋
王鑫
吴宗礼
姚淑婷
王玉洋
马晓勇
LIU Kai;CHEN Shuping;ZHAO Guofeng;WANG Xin;WU Zongli;YAO Shuting;WANG Yuyang;MA Xiaoyong(College of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《真空与低温》
2024年第5期580-588,共9页
Vacuum and Cryogenics
基金
甘肃省科技重大专项计划(22ZD6GA026)。
关键词
液氢管道
传热
气液两相流
截面含气率
热-流耦合
liquid hydrogen pipeline
heat transfer
gas-liquid two-phase flow
gas holdup
thermal fluid coupling