LNG低温波纹软管预冷瞬态传热分析  

Transient thermal analysis on pre-cooling process of LNG cryogenic corrugated hose

作　　者：武昌旭 张进[1] 程子云 王健 张玉[1] 刘军鹏[1] WU Changxu;ZHANG Jin;CHENG Ziyun;WANG Jian;ZHANG Yu;LIU Junpeng(College of Safety and Ocean Engineering,China University of Petroleum,Beijing,Beijing 102200,China;College of Civil and Environmental Engineering,University of Alberta,Edmonton T6G 2R3,Canada;Shanghai Marine Diesel Engine Research Institute,Shanghai 201203,China)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京102200 [2]阿尔伯塔大学土木与环境工程学院,加拿大埃德蒙顿T6G 2R3 [3]上海船用柴油机研究所,上海201203

出　　处：《中国海上油气》2023年第4期165-172,共8页China Offshore Oil and Gas

基　　金：国家自然科学基金“考虑残余应力的柔性立管复合抗拉铠装线强度失效机制(编号:52171286)”部分研究成果。

摘　　要：LNG(液化天然气)低温波纹软管预冷机理复杂,预冷效果受多种因素影响。为了准确求解软管预冷过程中管内介质及保冷层的瞬态温度,建立了LNG低温波纹软管预冷二维瞬态传热模型,基于显式有限差分法并运用Fluent软件对模型进行求解,分析软管内壁沿轴向以及保冷层沿径向的温度随保冷时间的变化规律;并进一步研究了保冷层厚度、氮气通入速度、管道半径对预冷效果的影响。结果表明:预冷工况下,当预冷时间一定时,软管内壁温度随轴向距离增加而升高;对于软管同一径向位置,保冷层温度随预冷时间的增加而降低,且径向距离越小,温降趋势越大;保冷层厚度及氮气通入速度对软管预冷效果的影响显著,当保冷层厚度小于28 mm时,增加保冷层厚度可以有效改善软管预冷效果;当氮气通入速度小于0.2 m/s时,可能会导致在规定时间内无法达到预冷要求;软管半径对预冷效果的影响没有保冷层厚度及氮气通入速度明显。本研究成果为改善LNG低温波纹软管的预冷效果提供了参考。The pre-cooling mechanism of LNG cryogenic corrugated hose is very complex,and the effect of pre-cooling is also affected by many factors.In order to obtain the temperatures of the medium inside of the hose and the cold insulation layer accurately during the pre-cooling process,a two-dimensional transient heat transfer model of LNG corrugated hose is developed and solved with explicit finite difference method in Fluent software.The temperature variations respectively along the axial direction of the hose inner wall and the radial direction of the cold insulation layer with the holding time are analyzed.The effects of thickness of insulation layer,speed of nitrogen and radius of hose on the pre-cooling process are followed investigated.The results indicate that the temperature of the inner wall increases with the increase of the axial distance when the pre-cooling time is constant,while the temperature of the cold insulation layer decreases with the increase of the pre-cooling time for the same radial position of the hose,and the smaller the radial distance the greater the temperature drop trend.The thickness of the cold insulation layer and the speed of nitrogen have a significant impact on the pre-cooling effect of the hose.The pre-cooling effect can be effectively improved by increasing the thickness of the cold insulation layer when its thickness is less than 28 mm.It may cause the failure to meet the pre-cooling requirements within the specified time when the speed of nitrogen is less than 0.2 m/s.The effect of hose radius on precooling process is not as obvious as the other two factors.The results of this research provide a reference for improving the pre-cooling effect of LNG cryogenic corrugated hoses.

关 键 词：LNG低温波纹软管 瞬态传热 显式有限差分法 预冷效果 温度分布 

分 类 号：TE832[石油与天然气工程—油气储运工程]