摘要
角部绝热结构的设计是大型LNG储罐绝热结构设计的关键。将大型LNG储罐角部绝热结构视为二维平面问题,利用ANSYS软件分析其温度场和热流密度的分布规律。结果表明:热量主要通过混凝土环梁以及罐底与罐壁的交汇处传入罐内,因此,保证角部保冷绝热结构的连续性非常重要。同时,设计角保冷块(TCP￡用以减少沿二次罐底的漏热量,为了增加热阻,通常使其长度在5 m左右。根据预冷中储罐角部降温过程的瞬时热分析结果,储罐的降温过程十分缓慢,在预冷初期,罐壁降温较慢且温度梯度小,罐底降温较快且温度梯度大,因此采用低温气体使罐底充分预冷有利于对储罐整体冷却的控制。
Corner adiabatic structure design is crucial for the adiabatic structure design of large-scale LNG storage tank. Regarding the corner adiabatic structure as a 2-dimensional problem,ANSYS software is used to analyze the distribution law of its temperature field and heat flux density. Results show that the heat is mainly transmitted to tank through the concrete ring beam and the joint between tank bottom and tank wall. Therefore,to ensure the continuity of corner adiabatic structure is of great importance. At the same time, when designing the TCP to reduce the heat leak and increase the heat resistance,its general length is about 5 meters. Based on the transient heat analysis on the corner temperature during pre-cooling process,the temperature of tank decreases very slowly. At the initial stage,the tank wall temperature drops slowly with small temperature gradient,while the tank floor temperature decreases relatively fast with large temperature gradient. Therefore using lower temperature gas to precool the tank sufficiently is efficient to control the cooling of the entire tank.
出处
《油气储运》
CAS
北大核心
2011年第1期37-40,5,共4页
Oil & Gas Storage and Transportation
关键词
LNG
储罐
角保冷块
绝热
温度场分布
热流密度
漏热量
LNG,tank,TCP,heat insulation,distribution of temperature field,heat flux density,heat leak
