以大型液化天然气(Liquefied Natural Gas,LNG)船的液货舱为研究对象,利用COMSOL软件建立其仿真模型,并利用LNG船实船气试数据对该模型的可靠性进行验证.研究表明:在进行LNG船液货舱气体置换时,进口氮气的流速越快,完成气体置换所需时间越短;增加进口氮气流速对缩短气体置换时间的效果随流速的增加逐渐减弱;随着进口氮气流速的增加,完成气体置换需消耗的氮气量先减少后增加.综合考虑完成气体置换所需时间和氮气量,推荐取进口氮气流速为10 m/s,此时液货舱完成气体置换所需时间为20.1 h,消耗的氮气总量为105.2 t.
Simulation Analysis of Inerting Conditions in Liquid Cargo Tanks of Large Membrane LNG Carriers
Taking the cargo hold of a large Liquefied Natural Gas(LNG)carrier as the research object,a simulation model was established using COMSOL software,and the reliability of the model was verified using the actual gas trial result of the ship.The research results indicate that the faster the flow rate of imported nitrogen gas during gas replacement in LNG cargo tanks,the shorter the time required to complete the gas replacement.The effect of increasing the flow rate of imported nitrogen on shortening the displacement time gradually weakens with the increase of flow rate.As the flow rate of imported nitrogen increases,the amount of nitrogen required to complete gas replacement first decreases and then increases.Taking into account the time required for gas replacement and the amount of nitrogen,it is recommended to have a nitrogen inlet flow rate of 10 m/s.At this time,the time required to complete gas replacement in the cargo tank is 20.1 hours,and the total nitrogen consumption is 105.2 tons.
万方数据
维普
