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除有效容积外,设置高度也是LNG储罐区防护堤设计的关键参数。采用数值模拟技术,对半地下LNG罐池,在不同防护堤高度作用下的LNG液池扩展和LNG低温蒸气扩散行为进行数值模拟,对比分析防护堤高度和罐池底面积对LNG低温蒸气扩散速度、可燃气云隔离距离和云团尺寸的影响。结果表明:增加防护堤高度可以有效减小LNG泄漏后产生的可燃气云体积、尺寸及最大扩散距离,但同时延长了可燃气云的滞留时间,增加燃爆和窒息发生的危险。对于同一种罐池,在液池充分扩展前,可燃气云最大扩散距离与罐池底面积成正比。对于LNG储罐区,可通过提升罐池的防护堤高度减小LNG扩散的安全距离。
In addition to the effective volume, the set-up height is also a key parameter in the design of the dike in the LNG tank area. Numerical simulations were carried out to simulate the expansion of LNG tanks and the diffusion of low-temperature steam LNG under semi-underground LNG tanks under the different height of levees. The comparison between the height of the levee and the bottom area of tank on the diffusion rate of LNG low-temperature vapor , Combustible gas cloud isolation distance and the impact of cloud size. The results show that increasing the height of the protective embankment can effectively reduce the volume, size and maximum diffusion distance of combustible gas cloud generated after LNG leakage, but at the same time prolong the residence time of combustible gas cloud and increase the danger of explosion and suffocation. For the same kind of tank, the maximum diffusion distance of combustible gas cloud is directly proportional to the tank bottom area before the tank is fully expanded. For LNG tank areas, the safety distance for LNG diffusion can be reduced by increasing the height of the bank of the tank.