BOG再液化装置用低温容器径向支撑结构设计及热力耦合分析

Structural design and coupled thermal-mechanical analysis for radius inner support in cryogenic vessel of BOG reliquefaction device

支撑结构作为低温容器的关键部件,跨常温—低温温区工作,并承接充装低温液体的内筒体重量,其性能好坏很大程度决定了低温容器技术的发展。本文介绍BOG再液化装置用低温容器径向支撑的结构设计,并进行热力耦合有限元分析,得到工作条件下结构的热流密度场、温度场、应力场和位移场。结果表明:该径向支撑平均热流密度0.0031 W/mm^2,玻璃钢管与KF真空内丝快装接头接触部位的温度已接近热端温度,可见绝热效果良好;最大热应力16.212 MPa,位于玻璃钢管的通气孔周围,满足强度要求;最大位移变形量0.0017 mm,位于热端,在材料允许变形范围内。通过分析,验证了低温容器径向支撑结构的合理性,有效提升了低温容器的机械性能和绝热性能。

As one of the key components of the cryogenic vessel,the supporting structure working at normal temperature to low temperature and bearing the weight of inner cylinder which filled with cryogenic liquid,its performance to a large extent determines the development of cryogenic vessel technology.The structure design of the radial support of the cryogenic vessel for BOG reliquefaction unit was introduced,and the thermal-mechanical coupling finite element analysis was conducted in this paper.Meanwhile,the thermal flux field,temperature field,stress field and displacement field of the structure under working conditions were obtained.The results show that the average heat flow density of the radial support is 0.0031 W/mm^2,the temperature of the contact part between the FRP pipe and KF vacuum inner wire quick assembly joint is close to the temperature of the hot side,which shows that the thermal insulation effect is fine;the maximum thermal stress is 16.212 MPa,which is located around the vent hole of the FRP pipe,which meets the strength requirements;the maximum displacement deformation is 0.0017 mm,which is located at the hot side,within the allowable deformation range of the material.The rationality of radius inner support in cryogenic vessel is verified through the analysis,and the mechanical and thermal insulation properties of the cryogenic vessel are effectively improved.