LNG卧式储罐拉带式支撑应力分析及结构优化  

Stress analysis and structure optimization of tension band support for LNG horizontal storage tank

作　　者：张卫义[1] 李星波 姚欣 赵杰[1] 宇波[1] 李伟 徐江英 ZHANG Weiyi;LI Xingbo;YAO Xin;ZHAO Jie;YU Bo;LI Wei;XU Jiangying(School of Mechanical Engineering&Hydrogen Energy Research Centre,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Beijing Minghui Tianhai Gas Storage Transportation and Sales Co.,Ltd.,Beijing 101112,China;Beijing Tianhai Cryogenic Equipment Co.,Ltd.,Beijing 101109,China)

机构地区：[1]北京石油化工学院机械工程学院氢能研究中心,北京102617 [2]北京明晖天海气体储运装备销售有限公司,北京101112 [3]北京天海低温设备有限公司,北京101109

出　　处：《压力容器》2022年第8期40-49,共10页Pressure Vessel Technology

基　　金：国家重点研发计划“氢能技术”重点专项“中低压纯氢与掺氢燃气管输工艺与掺氢设备研发”(2021YFB4001602)。

摘　　要：为了解决拉带式支撑结构在燃料储罐工作载荷作用下应力超标的问题,采用有限元方法对该低温双层真空绝热容器进行了热-结构耦合计算,得到了拉带式支撑结构处的内、外容器应力分布规律。结果表明,原设计一字型横向拉带结构产生的温差应力较大,最大Mises应力远超强度极限。对原结构进行了改进设计,主要考虑了三种结构,分别是U型结构、Ω型结构以及双Ω型结构,针对这三种改进型结构重新进行了有限元热-结构耦合计算。结果表明,双Ω型拉带结构为最优结构,最大Mises应力减小80.33%,降低到屈服极限以内。对双Ω型拉带式结构进行了优化计算,主要对结构中半径R_(1),R_(2),结构厚度δ_(1),δ_(2)以及双Ω间的距离L_(0)进行优化。优化结果表明,采用优化尺寸设计,双Ω型结构最高点的内表面上的Mises应力值最小,其值为202.19 MPa,小于屈服极限值。通过对双Ω型结构主要尺寸进行优化计算,确定了燃料罐横向拉带支撑最优化结构的尺寸比例,可以满足该燃料储罐强度要求。In order to solve the problem that the stress of the tension band support structure exceeds the standard under the working load of the fuel storage tank,the thermal-structural coupling calculation of the low-temperature double-layer vacuum insulated container was carried out by the finite element method,and the stress distribution law of the tension band support structure was obtained.The results show that the temperature difference stress generated by the original design“―”shaped transverse tension belt structure is relatively large,and the maximum Mises stress far exceeds the strength limit.The design improvement of the original structure was carried out,and three structures were mainly considered,namely,U type structure,Ωtype structure and doubleΩtype structure.For these three improved structures,the finite element thermal-structural coupling calculations were carried out again.The results show that the doubleΩtype tension band structure is the optimal structure,and the maximum Mises stress is reduced by 80.33%,which is within the yield limit.The optimization calculation of the doubleΩtype tension band structure was carried out,mainly to optimize the radii R_(1)and R_(2),the thickness of the structureδ_(1),δ_(2)and the distance L_(0)between the doubleΩin the structure.The optimization results show that with the optimized size design,the Mises stress on the inner surface of the highest point of the doubleΩtype structure is the smallest,and its value is 202.19 MPa,which is less than the yield limit value.Through the optimization calculation of the main dimensions of the doubleΩtype structure,the dimension scale of the optimal structure of the fuel tank′s transverse tension band support was determined,and the strength requirements of the fuel storage tank can be met.

关 键 词：低温双层罐 热-固耦合应力 拉带 结构优化 

分 类 号：TH49[机械工程—机械制造及自动化] TE972[石油与天然气工程—石油机械设备] O344.1[理学—固体力学]