大型LNG储罐预冷动态模拟

大型常压LNG储罐在接收站中占有很高的投资份额,是接收站关键的储存容器,在启用时对调试技术的要求较高,其中,储罐的冷却是最重要的预备环节。基于气液两相容积节点原理,建立喷淋LNG蒸发计算模型,搭建大型LNG储罐预冷过程动态仿真平台,以160000 m³大型LNG地上全容储罐为例,计算其在预冷过程中所需要的时间以及预冷所用LNG总量,得到了预冷过程中储罐压力、BOG产生量以及储罐内部温度的动态变化,为设计优化液化天然气储罐预冷策略提供了理论依据。

Dynamic simulation of pre-cooling processes for large-scale LNG storage tanks

LNG storage tank is one of the most important and expensive devices for LNG terminals.The process of pre-cooling the LNG storage tank is the most critical and most dangerous debugging session.Based on the principle of gas-liquid two-phase volume node,the large-scale LNG storage tank pre-cooling dynamic simulation model was established.Taking a 160000 m³ LNG tank as an example,the time required for the pre-cooling process and the total used LNG for the tank pre-cooling were computed and the pressure of the LNG storage tank,the amount of BOG generation and the temperature of the tank during the pre-cooling process were determined with the established dynamic model.The optimization of the pre-cooled process design for a large-scale LNG storage tank was provided in a theoretical basis.