立式液化天然气储罐泄漏数值模拟及分析

Numerical simulation and analysis of vertical LNG storage tank leak

为了更好地研究立式液化天然气储罐泄漏扩散规律,采用Fluent软件对立式液化天然气储罐泄漏扩散过程进行数值模拟.文章进行了立式液化天然气储罐泄漏过程的三维仿真模拟,以及储罐顺风泄漏与逆风泄漏两种不同情况下的泄漏模拟分析.同时,针对立式液化天然气储罐罐体较高的情况分析了不同泄漏口位置对泄漏的影响,并且分析了泄漏口口径大小对泄漏危险性的影响.结果表明:在风流的作用下,燃气储罐逆风泄漏时的危险性要远大于顺风泄漏的情况.泄漏口位置位于储罐壁高处时,泄漏气体扩散快;而泄漏口位置靠近地面的情况下,泄漏气体会沉积在地面不易扩散,危险性更大;泄漏口口径越大,泄漏所造成的危险性也随之增大.

In order to study the vertical liquefied natural gas leakage and diffusion regular pattern, the three- dimensional simulation on vertical liquefied natural gas leakage and diffusion process was completed by software Fluent. This paper simulated the leakage process of vertical LNG storage tank and analyzed two situations on upwind and downwind. At the same time, since the vertical LNG containers are higher, analyzed the effects of leaking holes in different positions and sizes were analyzed. The results show： under the influence of the wind, downwind leakage is much danger than upwind leakage. When the leaking holes are located in the tank wall high, the diffusion of gas is fast ; the leaking gas can＇t spread and will be deposited; when the leaking holes are closed to the ground, this situation is much more dangerous; The wider the caliber of the leaking hole is, the more danger the leak will cause.