Abstract

Transport and storage of liquefied natural gas (LNG) requires special double-walled cryogenic tanks. To provide a liquid state of LNG throughout entire storage time a temperature inside the tank should be equal −160 °C under the pressure of around 7 bar. Maintaining these parameters requires a vacuum insulation system and internal supports designed to minimize heat leakage into the tank. Additionally, the internal supports must be able to transfer complex mechanical loads that may occur during the operation of the tanker. Combinations and values of directional mechanical loads and thermal loads, to be accepted in designing mobile cryogenic tanks, are determined by proper vessels standards. In this paper, we proposed the construction of internal supports for 25 m³ road tanker, which structure allows to reduce heat leakage into the internal tank, while transferring the complex mechanical loads. Tests of the presented solutions were carried out applying both mechanical and thermal finite element analysis using ANSYS software.

摘要

液化天然气（LNG）的运输和储存需要特殊的双壁低温罐。为了在整个存储时间内提供液态LNG，在约7 bar的压力下，储罐内部的温度应等于-160°C。要保持这些参数，就需要一个真空绝热系统和内部支撑件，以最大程度地减少泄漏到储罐中的热量。另外，内部支撑必须能够传递在加油机运行期间可能发生的复杂机械负载。设计移动式低温储罐时应接受的方向性机械载荷和热载荷的组合和值，由适当的容器标准确定。在本文中，我们提出了25 m ³的内部支撑结构。公路油轮，这种结构可以减少热量向内部油箱的泄漏，同时转移复杂的机械载荷。使用ANSYS软件通过机械和热有限元分析对提出的解决方案进行了测试。