大型LNG储罐结构优化及研究

发布时间：2018-05-14 13:51

本文选题：LNG储罐 + 结构　；参考：《青岛科技大学》2015年硕士论文

【摘要】：大型LNG储罐是LNG储运过程中的重要设备,是LNG产业链的重要组成部分,它结构复杂、体积大、质量大、安全性高、投资巨大。本文主要对大型LNG储罐设计标准、内罐选材、保冷和罐体结构形式进行研究。介绍了大型LNG储罐的研究现状,根据最省材料法和最省费用法计算出储罐的经济尺寸,确定当D/H=8/3时比较合理。根据LNG低温介质的特性,选择9Ni钢作为内罐材料,并对9Ni钢性能和焊接性进行分析。根据AP1650标准、EN14620标准和JISB8501标准详细论述了储罐壁厚计算方法。计算出5.0×104-2.0×105m3储罐内罐壁厚度,并利用OriginPro 8.0将计算结果绘制成图,通过对比得出EN14620标准计算出的壁厚最经济。介绍了常用保冷类型和保冷材料,对储罐不同部位进行保冷设计,并对罐壁、罐顶和罐底进行漏热计算。利用ANSYS Workbench对内罐罐壁进行应力分析,分析结果表明不同层壁板连接处存在应力集中,储罐的应力峰值随着储罐容积的增加而增加。采用变点法可设计有效改善储罐应力水平,降低储罐的应力峰值。我国尚无大型LNG储罐的设计标准,所以本文对我国大型LNG储罐的设计与研究有一定的参考价值和工程意义。
[Abstract]:Large LNG storage tank is an important equipment in the process of LNG storage and transportation. It is an important part of LNG industrial chain. It has complex structure, large volume, large quality, high safety and huge investment. In this paper, the design standard, material selection, cold preservation and tank structure of large LNG storage tank are studied. This paper introduces the research status of large LNG storage tank, calculates the economic size of the tank according to the most economical material method and the most economical cost method, and determines that it is more reasonable when D/H=8/3 is used. According to the characteristics of LNG medium at low temperature, 9Ni steel was selected as inner tank material, and the properties and weldability of 9Ni steel were analyzed. According to AP1650 standard en 14620 standard and JISB8501 standard, the calculation method of tank wall thickness is discussed in detail. The thickness of the inner wall of 5.0 脳 104-2.0 脳 105m3 storage tank is calculated, and the calculated results are plotted by OriginPro 8.0. By comparison, the most economical wall thickness calculated by EN14620 standard is obtained. This paper introduces the common types and materials of cold preservation, designs the different parts of the storage tank, and calculates the heat leakage of the tank wall, top and bottom of the tank. The stress of the inner tank wall is analyzed by ANSYS Workbench. The results show that the stress concentration exists at the joint of the different layers of the wall plate, and the peak stress of the tank increases with the increase of the tank volume. The stress level of the tank can be effectively improved and the peak stress of the tank can be reduced by using the variable point method. There is no design standard for large LNG tanks in China, so this paper has some reference value and engineering significance for the design and research of large LNG tanks in China.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE972

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