含腐蚀缺陷氢气管道局部氢浓度有限元模拟分析

doi:10.11902/1005.4537.2024.161

中国腐蚀与防护学报

2025, Vol. 45

Issue (2): 359-370 CSTR: 32134.14.1005.4537.2024.161 DOI: 10.11902/1005.4537.2024.161

临氢关键材料服役行为研究专刊

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含腐蚀缺陷氢气管道局部氢浓度有限元模拟分析

崔德春¹^,², 熊亮¹, 于邦廷¹, 吴浩志³, 董绍华³, 陈林³(

)

^1.中海油研究总院有限责任公司新能源研究院北京 100028
^2.怀柔实验室山西研究院太原 030032
^3.中国石油大学(北京)安全与海洋工程学院北京 102249

Finite Element Analysis of Local Hydrogen Concentration in Hydrogen Pipeline With Corrosion Defects

CUI Dechun¹^,², XIONG Liang¹, YU Bangting¹, WU Haozhi³, DONG Shaohua³, CHEN Lin³(

)

^1.New Energy Research Department, CNOOC Research Institute Co., Ltd., Beijing 100028, China
^2.Shanxi Research Institute of Huairou Laboratory, Taiyuan 030032, China
^3.College of Safety and Ocean Engineering, China University of Petroleum, Beijing 102249, China

引用本文:

崔德春, 熊亮, 于邦廷, 吴浩志, 董绍华, 陈林. 含腐蚀缺陷氢气管道局部氢浓度有限元模拟分析[J]. 中国腐蚀与防护学报, 2025, 45(2): 359-370.
Dechun CUI, Liang XIONG, Bangting YU, Haozhi WU, Shaohua DONG, Lin CHEN. Finite Element Analysis of Local Hydrogen Concentration in Hydrogen Pipeline With Corrosion Defects[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 359-370.

全文: PDF(12881 KB) HTML

摘要:

针对含有缺陷的现有天然气管道，开展管线钢腐蚀缺陷处氢渗透及局部氢浓度的研究对在役氢气管道基础设施的完整性和安全性至关重要。本文在COMSOL Multiphysics中通过耦合应力场和氢扩散场，建立了含腐蚀缺陷X52钢管道中氢扩散和分布的有限元模型，研究了内部压力、缺陷位置、缺陷长度和深度对氢扩散和分布的影响规律。结果表明，内压导致了缺陷处局部应力集中和氢分布不均，缺陷处的氢浓度随内压的增大而增加，但内腐蚀缺陷处的氢浓度阈值低于外腐蚀缺陷处的氢浓度阈值，并且两缺陷处最大氢浓度位置不同。此外，缺陷长度和深度也会影响氢浓度阈值和位置，并且对内、外腐蚀的影响不同。

关键词 ：腐蚀缺陷, 有限元模型, 氢分布, X52钢

Abstract：

Deep understanding on the interaction of hydrogen atoms with pipeline steel is crucial for the matter of the integrity and safety in-service of hydrogen pipeline infrastructure, especially for the case when the existing pipelines with corrosion defects were adopted as hydrogen transportation pipeline. Herein, a finite element (FE) model was developed by coupling mechanical- and diffusion-fields in COMSOL Multiphysics, so that the effect of internal pressure, defect location, defect length and depth on the hydrogen diffusion and distribution was assessed. Results demonstrated that internal pressure may induce local stress concentration and non-uniform hydrogen distribution at defect. Hydrogen concentration at defect increases with the internal pressure, but the threshold of hydrogen concentration at internal corrosion defects is lower than that at external corrosion defects, and the corresponding positions of the maximum hydrogen concentration are different for the two defects. Moreover, the defect length and depth also affect the hydrogen concentration threshold and where the hydrogen concentration maximum emerges, but such effects vary depending on whether the corrosion in question is internal or external.

Key words： corrosion defect finite element model hydrogen distribution X52 steel

收稿日期: 2024-05-22 32134.14.1005.4537.2024.161

ZTFLH:

TG111.91

通讯作者: 陈林，E-mail：chenlin@cup.edu.cn，研究方向为金属材料腐蚀与防护

Corresponding author: CHEN Lin, E-mail: chenlin@cup.edu.cn

作者简介: 崔德春，男，1968年生，博士，高级工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.161 或 https://www.jcscp.org/CN/Y2025/V45/I2/359

图1 处于内部压力下的管段示意图，管道上存在的腐蚀缺陷的俯视图和横截面图，用于数值分析的四分之一模型，模型上的内部腐蚀缺陷和外部腐蚀缺陷，内部和外部腐蚀缺陷左右边缘示意图

图2 模型网格划分

图3 外部腐蚀缺陷处最大von Mises应力、静水应力、氢浓度与网格敏感性分析

图4 6~10 MPa内压下内部和外部腐蚀缺陷处von Mises应力(MPa)分布

图5 von Mises应力沿着内腐蚀缺陷左边缘和右边缘，以及外部腐蚀缺陷左边缘和右边缘的线性分布

图6 6~10 MPa内压下内部和外部腐蚀缺陷处的静水应力分布(MPa)

图7 静水应力沿着内腐蚀缺陷左边缘和右边缘，以及外部腐蚀缺陷左边缘和右边缘的线性分布

图8 10 MPa下外部腐蚀缺陷处的氢扩散过程

图9 5 × 106 s时6~10 MPa内压下内部和外部腐蚀缺陷处的氢浓度分布(mol/m3)

图10 氢浓度沿着内腐蚀缺陷左边缘和右边缘，以及外部腐蚀缺陷左边缘和右边缘的线性分布

表1 不同内压下的最大氢浓度

图11 内部腐蚀缺陷和外部腐蚀缺陷的最大氢浓度位置

图12 5 × 106 s时10 MPa下不同长度内、外腐蚀缺陷处的氢分布

表2 不同缺陷长度处的最大氢浓度

图13 5 × 106 s时10 MPa下不同深度内、外腐蚀缺陷处的氢分布

表3 不同缺陷深度处的最大氢浓度

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