含双腐蚀缺陷管道的氢浓度分布模拟  

Simulation of Hydrogen Distribution in Pipeline with Double Corrosion Defects

作　　者：郭诗雯 吴浩志 董绍华[1,2] 陈林[1,2] 程玉峰 GUO Shiwen;WU Haozhi;DONG Shaohua;CHEN Lin;CHENG Frank(School of Safety and Ocean Engineering,China University of Petroleum Beijing,Beijing 102249,China;Key Laboratory of Oil and Gas Safety and Emergency Technology,Ministry of Emergency Management,University of Petroleum Beijing,Beijing 102249,China;Schulich School of Engineering,University of Calgary,Calgary T2N 1N4,Canada)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京102249 [2]中国石油大学(北京)应急管理部油气生产安全与应急技术重点实验室,北京102249 [3]Schulich School of Engineering,University of Calgary,Calgary T2N 1N4

出　　处：《中国腐蚀与防护学报》2024年第2期335-344,共10页Journal of Chinese Society For Corrosion and Protection

基　　金：中国石油大学(北京)科研基金(2462023BJRC020)。

摘　　要：为了研究含双腐蚀缺陷管道上的氢浓度分布规律,本文建立了应力场和氢扩散场耦合的有限元模型,针对双腐蚀缺陷间的应力耦合行为,探究了腐蚀缺陷长度、缺陷间距以及管道所受拉伸应变对管材中氢扩散富集行为的影响机制。结果表明,腐蚀缺陷的存在导致氢原子在管道内发生局部富集,富集区最大氢浓度数值随拉伸应变的增大和缺陷长度的减小而升高,同时,最大氢浓度位置发生改变。而双缺陷在间距足够大时不再对氢扩散和富集产生叠加影响,可看作两个独立的缺陷。研究成果为含双腐蚀缺陷管道在输氢环境中的安全评价提供了理论支撑。To deliever mixed natural gas and hydrogen with the existed natural gas pipelines is an important way to achieve efficient hydrogen transportation.However,corrosion defects present on these aged pipelines will affect the diffusion and enrichment of hydrogen atoms,potentially causing hydrogen embrittlement in the pipeline steel and further leading to the pipeline failure.In addition,corrosion defects on pipelines often exist in the form of adjacent double corrosion defects and even multiple corrosion defect groups.The interaction between adjacent defects can complicate the hydrogen diffusion and enrichment behavior,and ultimately affect the hydrogen induced failure behavior of the pipeline.In order to study the distribution of hydrogen concentration on pipelines containing double corrosion defects,a finite element model coupled with stress field and diffusion field was developed.The influence mechanism of corrosion defect length,defect spacing and applied tensile strain on hydrogen diffusion and enrichment behavior in steel was investigated in terms of the stress coupling behavior between the two corrosion defects.The results showed that the existence of corrosion defects caused the accumulation of hydrogen atoms in steel,and the value and location of the maximum hydrogen concentration in accumulation area changed with tensile strain,defect length and defect spacing.However,when the distance between the two defects is large enough,they will not have a superposition effect on the hydrogen diffusion and enrichment,and thus they can be regarded as two independent defects.This study provides a theoretical reference for the safety assessment of hydrogen damage in hydrogen transmission pipelines with double corrosion defects.

关 键 词：双腐蚀缺陷 氢分布 有限元模拟 X52 管线钢 

分 类 号：TE832[石油与天然气工程—油气储运工程]