中间介质式气化器LNG跨临界传热特性模拟与分析  

Simulation and analysis of trans-critical heat transfer characteristics of LNG in Intermediate Fluid Vaporizer

作　　者：姚宝龙 唐建峰[1] 王国瑞 王剑琨 于笑 许涛 YAO Baolong;TANG Jianfeng;WANG Guorui;WANG Jiankun;YU Xiao;XU Tao(College of Pipe and Civil Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China;Sinopec Tianjin Liquefied Natural Gas Co.,Ltd.,Tianjin 300457,China;Sinopec Qingdao Liquefied Natural Gas Co.,Ltd.,Qingdao 266580,Shandong,China)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266580 [2]中国石化天津液化天然气有限责任公司,天津300457 [3]中国石化青岛液化天然气有限责任公司,山东青岛266580

出　　处：《天然气化工—C1化学与化工》2022年第2期150-158,共9页Natural Gas Chemical Industry

摘　　要：建立了中间介质式气化器(IFV)U型管的CFD三维数值模型,开展了LNG跨临界流动传热的模拟,探究了LNG在拟临界点附近及弯管处的流动传热特性,分析了LNG入口质量流量、丙烷饱和温度对IFV传热的影响。结果表明:升温过程中,沿管程LNG出现了明显的流动加速效应,局部传热系数先增大后减小,在拟临界点附近达到最大值;在弯管处内部流场被完全重构,局部换热系数得到加强;随着入口流量的增加,局部传热系数的峰值明显增大且峰值出现位置后移;相同截面处LNG平均温度与丙烷饱和温度成正相关,但局部传热系数的峰值随着丙烷饱和温度的升高而降低,且丙烷饱和温度越高,峰值之后传热恶化的现象越明显。The CFD three-dimensional numerical model of U-tube of Intermediate Fluid Vaporizer(IFV) was established, the simulation of LNG trans-critical flow and heat transfer was carried out, the flow and heat transfer characteristics of LNG near the pseudo-critical point and at the bend were explored, and the effects of LNG inlet mass flow and propane saturation temperature on IFV heat transfer were analyzed. The results show that as the temperature rises, there is an obvious flow acceleration effect of LNG along the tube side, the local heat transfer coefficient first increases and then decreases, and reaches the maximum near the pseudocritical point. The flow field is completely reconstructed and the local heat transfer coefficient is enhanced at the bend. With the increase of inlet flow rate, the peak value of local heat transfer coefficient increases obviously, and the position of peak value moves backward. The average temperature of LNG at the same section is positively correlated with the propane saturation temperature, but the peak value of local heat transfer coefficient decreases with the increase of propane saturation temperature, and the higher the propane saturation temperature, the more obvious the deterioration of heat transfer after the peak value.

关 键 词：液化天然气 中间介质式气化器 超临界流体 局部传热系数 

分 类 号：TE08[石油与天然气工程] TE83