大型全容式LNG储罐漏热分析

Heat leakage analysis of large full-capacity LNG storage tank

利用有限元模拟软件Ansys对大型全容式LNG储罐罐顶、罐壁、罐底三部分建模,进行温度场数值模拟。通过与企业现场检测数据对比表明,储罐温度场分布情况与实测结果吻合较好。分析模拟,表明罐底的绝热性能最差,需要对罐底保冷层进行优化设计。同时对比分析了不同环境温度与环境风速对储罐各部位漏热量的影响,得到环境温度变化对罐壁漏热量影响较大;环境风速变化对储罐整体漏热量影响较小,仅对罐顶漏热量有较大影响。

The finite element simulation software Ansys was used to model the top, wall and bottom of the storage tank and conduct numerical simulation to obtain the temperature field distribution of the large full - capacity LNG storage tank. Compared with the field test data, it shows that the distribution of temperature field in the storage tank is consistent with the measured data. The simulation results show that the bottom of the tank has the worst thermal insulation performance. The bottom insulation layer needs to be optimized. Meanwhile, the influence of different environmental factors on the amount of heat leak in various parts of the storage tank was analyzed. Ambient temperature has a great influence on the leakage of heat from the tank wall. And the wind speed has little effect on the overall leakage of the tank, which has a great impact on the heat leakage at the top of the storage tank.