高温管线限位支撑结构的热力耦合分析及结构改进

Thermal-mechanical Coupling Load Analysis and Structure Improvement of Pipeline Displacement Support Structure at High Temperature

高温管线由于热膨胀产生的热位移较大,通常在管道上设置膨胀节与限位支撑结构来减小位移。以高温管线上两个膨胀节之间的管道三通为例,并在三通上设置了限位支撑结构。由于限位支撑结构特殊,采用ANSYS软件中APDL语言建立了管道三通与特殊限位支撑结构的有限元模型,对其在热-机械载荷耦合作用下进行了详细应力分析,并提出改进结构,满足了结构在内压与外载荷作用下的强度要求。计算结果表明,在高温管线限位支撑结构设计时,应尽量减少约束和温差产生的应力。模拟结果可为高温管线特殊限位支撑结构的有限元分析设计提供一定参考依据。

The thermal displacement of high temperature pipeline is lager due to its thermal expansion. In this condition ,the expansion joint and displacement support structure are usually applied to reduce the thermal displacement. The reducing tee joint with special displacement support structure between the two expansion joints in the high temperature pipeline was used as an example. Due to the particularity of the displacement support structure, the design by rule method is not applicable. The finite element mode of the reducing tee joint with special displacement support structure was established based on the APDL lan- guage of ANSYS software, and the stress analysis was carried out under thermal-mechanical coupling load. The improvement structure was proposed, which can satisfy the strength requirements under internal pressure coupling with mechanical load. The calculation results indicated that the constraints and the stress produced by differential temperature should be reduced for the high temperature pipeline attach- ments structure design. The analysis results and methods can provide some theory and practical references for the finite element analysis of the special pipeline with displacement support structure under high tem- perature.