爆炸荷载作用下LNG全容罐安全性优化设计

Optimal design for safety of LNG full-capacity storage tank under explosion load

为了确保LNG储罐运行期间的安全性,对爆炸荷载作用下LNG全容罐结构安全性优化进行研究。建立了考虑储罐内液体晃动的储罐爆炸分析有限元模型,采用冲击和对流弹簧-质点模型模拟LNG的晃动形态;对储罐进行时程分析,确定储罐结构的动态响应;采用M-N曲线对储罐安全性进行分析,并对不满足安全性要求的情况提出解决方案,对LNG全容罐抗爆能力进行优化设计。研究结果表明:在爆炸荷载作用下,LNG全容罐结构响应呈周期性衰减趋势,爆炸主要影响区域位于储罐穹顶与外墙连接处,且对环向安全性的影响大于径向;降低爆炸荷载峰值压力和增加构件配筋,均能有效提高LNG全容罐的安全性。

In order to ensure the safety of LNG storage tank during operation,the optimization method of structural safety of LNG full-capacity storage tank under explosion load was studied.The finite element model for tank explosion analysis,which had taken into account the liquid sloshing in the tank,was established and the sloshing state of LNG was simulated by the impact and convection spring-mass model.The time-history analysis of the storage tank was conducted to determine the dynamic response of the storage tank structure.The M-N curve was used to analyze the safety of the storage tank,the solutions were proposed for the situations that did not meet the safety requirements,and the anti-explosion capability of LNG full-capacity tank was optimized.The results show that the structural response of LNG full-capacity tank appears as a periodic attenuation under the explosion load.The main impact area of explosion is located at the joining between the tank dome and the outer wall,and the impact on circumferential safety is greater than that on radial safety.Both reducing the peak pressure of explosion load and increasing the reinforcement of components can effectively improve the safety of fullcapacity storage tank.