【摘要】：廣泛用于LNG等輸送的高真空多層絕熱(HV-MLI)低溫管道常使用波紋管膨脹節(jié)來補償其內管的冷縮變形,波紋管由于工作在深冷環(huán)境中且要承受液體內壓,在實際使用過程中常出現斷裂進而導致整個管道失效。為此,介紹了HV-MLI低溫管道的基本結構,建立了波紋管有限元模型,在HV-MLI低溫管道輸送LNG、LO_2及LN_2的不同工況下對波紋管進行了應力非線性有限元計算,分析了軸向位移載荷及內壓載荷分別作用下的波紋管響應狀況,并結合國家標準GB/T 12777—2008對所用波紋管進行了強度及疲勞壽命校核。結果表明:(1)波紋管滿足HV-MLI低溫管道使用要求;(2)輸送LN_2工況時波紋管等效應力最大,波紋管波峰內表面為危險點,此時可以考慮適當降低介質輸送壓力;(3)軸向位移載荷引起的波紋管子午向應力遠超過材料的屈服極限,是引起波紋管疲勞損壞的主要因素,在管道設計及使用時應嚴格控制其數值。
[Abstract]:High vacuum multilayer adiabatic (HV-MLI) cryogenic pipes widely used in the transportation of LNG and so on often use bellows expansion joints to compensate for the cold shrinkage deformation of the inner tubes. The bellows work in cryogenic environments and have to bear the internal pressure of liquids. Fracture often occurs during practical use, which leads to the failure of the whole pipeline. In this paper, the basic structure of HV-MLI cryogenic pipeline is introduced, the finite element model of corrugated pipe is established, and the stress nonlinear finite element calculation of corrugated pipe is carried out under different working conditions of HV-MLI cryogenic pipeline conveying LNG,LO_2 and LN_2. The response of bellows under axial displacement load and internal pressure load is analyzed, and the strength and fatigue life of the bellows are checked with the national standard GB/T 12777-2008. The results show that: (1) the bellows meet the requirements of the HV-MLI cryogenic pipeline, (2) the equivalent stress of the bellows is the largest and the inner surface of the wave peak of the corrugated pipe is the dangerous point under the condition of LN_2 transportation. (3) the meridional stress of bellows caused by axial displacement load is far beyond the yield limit of material, which is the main factor causing fatigue damage of bellows. The values of bellows should be strictly controlled in the design and use of pipes.
【作者單位】： 蘭州理工大學石油化工學院;甘肅藍科石化高新裝備股份有限公司;
【基金】：甘肅省科技重大專項“大型LNG貯罐研發(fā)”(編號:1203GKDA001)
【分類號】：TE973

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本文編號：2333052