基于FLACS的LNG船舶泄漏爆炸过程数值模拟研究*

为研究大尺寸、全场景下LNG船舶卸货作业过程中的泄漏爆炸风险，构建某LNG接收站及其周边20.5 km2的区域场景模型，采用FLACS软件数值模拟LNG泄漏扩散、气云爆炸的演化过程。结果表明:LNG从卸料臂处以满输速率持续泄漏5 min，最大液池面积17 047 m2，最大汽化速率350 kg/m3，遇点火源发生气云爆炸，爆炸持续时间12 s，产生最高爆炸火球340 m和最大爆炸超压0.25 MPa，形成半径380 m轻伤区、150 m重伤区和60 m死亡区。

Numerical simulation on leakage and explosion of LNG ship based on FLACS

In order to study the risk of leakage and explosion during the unloading operation of LNG ship under large size and full scene,a 20.5 km2 regional scene model was constructed,which included an LNG receiver station and adjacent buildings,and the FLACS software was applied to simulate the leakage,diffusion and gas cloud explosion processes of LNG.The results showed that when LNG continuously leaked for 5 minutes with full transportation rate from the unloading arm,the maximum liquid pool area was 17 047 m2,the maximum evaporation rate was 350 kg/m3.When the gas cloud was ignited,the explosion occurred and lasted for 12 seconds.The explosion produced the highest fireball of 340 m and the maximum overpressure of 2.5 bar,and formed the slightly injured area (radius of 340 m),seriously injured area (radius of 150 m) and death area (radius of 60 m).