摘要
双钢壁液化天然气(Liquefied Natural Gas, LNG)储罐以建造周期短、投资小等优点备受青睐,但相较混凝土储罐而言,其易在外部爆炸载荷作用下发生破坏。为此,以双钢壁LNG储罐为研究对象,建立包括外罐-保冷材料-内罐-罐内液体的多相耦合有限元模型,分析外部可燃气云爆炸作用下的内外罐、保冷材料及罐内液体之间的相互作用和罐体结构响应,探究不同可燃气云当量下储罐的破坏行为;并分析不同运行状态、不同结构参数下储罐的抗爆性能。结果表明:随着可燃气云当量的增加,储罐依次发生锚带屈服、罐壁屈服以及罐壁和锚带的断裂破坏;随着罐内液位的升高,储罐的抗爆性能有所提升;当罐体的基础壁厚较小时,采用增加壁厚的方案,其最大变形降低13.53%;当罐体的基础壁厚较大时,采用增设加强圈的方案,其最大变形降低34.28%。
This study focuses on double steel-walled LNG tanks,where the load transfer between the air-storage tank and the liquid-inner tank is modeled using the Euler/Lagrange coupling algorithm.The contact behavior between the outer tank,inner tank,and foundation is represented by the surface-to-surface contact algorithm,while the load transfer between the outer tank,cold insulation material,and inner tank is modeled using the erosion contact algorithm.A multiphase coupled finite element model was developed,incorporating the outer tank,cold insulation material,inner tank,and the liquid inside the tank.By analyzing the interactions between the inner tank,outer tank,cold insulation materials,and the liquid,as well as the structural response of the tank under explosion loads from an external combustible gas cloud,the failure behavior of the tank under varying combustible gas cloud equivalents was determined.The anti-explosion performance of the storage tank under different operating conditions and structural parameters was analyzed.The calculation results reveal that as the flammable gas cloud equivalent increases,the storage tank undergoes successive stages of failure,including anchor band yielding,tank wall yielding,tank wall fracture,and finally anchor band fracture.Due to the anchoring effect of the anchor belt on the tank,it yields earlier than the tank but fails later than the tank itself.As the liquid level in the tank increases,the anti-explosion performance improves.When the incident overpressure reaches 1760.0 kPa,the outer tank of the empty tank is damaged,whereas both the inner and outer tanks of the full-level tank remain undamaged.When the base wall thickness of the tank is thin,increasing the wall thickness can reduce the maximum deformation of the tank wall by 13.53%.Conversely,when the base wall thickness is thick,adding a reinforcing ring can reduce the maximum deformation of the tank wall by 34.28%.The findings of this study provide valuable theoretical insights for the anti-explosion structural design of double steel-walled LNG tanks.
作者
芦烨
崔苏杰
王智坚
丁宇奇
吕奇霖
李晓琳
尹青锋
LU Ye;CUI Sujie;WANG Zhijian;DING Yuqi;L Qilin;LI Xiaolin;YIN Qingfeng(College of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,Heilongjiang,China;Sinopec Engineering Incorporation,Beijing 100101,China)
出处
《安全与环境学报》
北大核心
2025年第7期2513-2524,共12页
Journal of Safety and Environment
基金
国家自然科学基金项目(51604080)
中国博士后基金项目(2024M760850)
黑龙江省自然科学基金项目(LH2022A003)
黑龙江省博士后科研启动基金项目(LBH-Q20082)。
关键词
安全工程
双钢壁LNG储罐
外爆载荷
多相耦合
破坏
抗爆性能
safety engineering
double steel-walled LNG tanks
explosion load
multi-phase coupling
failure
anti-explosion performance
作者简介
芦烨,讲师,博士,从事油气储运装备安全评价及优化设计研究,luye nepu@163.com;通信作者:丁宇奇,教授,博士,从事油气储运装备安全评价及优化设计研究,jslx2004@163.com。
