天然气长输管道金属损失漏磁内检测技术研究

Research on Internal Detection Technology of Metal Loss of Natural Gas Pipeline in Magnetic Flux Leakage

由于天然气储运管线常受自然界和人为因素环境影响而产生金属材料损失与失效问题,外检技术存在着使用环境局限,而漏磁内检技术则因环境适应性强、性价比高等优点而被国内广泛应用。因此提出天然气长输管道金属漏磁内检测技术研究。根据金属漏磁内检测技术基本原理,确定内检测系统中所用工具即金属漏磁内检测仪及其主要构成模块、工作方式等。运用金属漏磁内检测技术的有限元仿真分析,并根据金属漏磁内有限元分析理论建立方程,以选择合适的内检测装置和软件,建构有限元仿真模型重构实验。参数化分析有限元仿真模型结果,实现管道缺陷尺寸、金属损失程度量化研究。实验结果表明,内检测技术在管道管理与维修上损失率较低,更适合金属管道探测。

As natural gas storage and transportation pipelines are often affected by natural and man-made factors,the loss and failure of metal materials are caused by environmental factors.The external inspection technology has its use environment limitations,while the magnetic flux leakage internal inspection technology has the advantages of strong environmental adaptability and high cost performance.And it is widely used in China.Therefore,the research on the internal detection technology of metal magnetic flux leakage in the long-distance natural gas pipeline is proposed.According to the basic principle of the metal magnetic flux leakage detection technology,determine the tool used in the internal detection system,namely the metal magnetic flux leakage internal detector and its main components,working methods,etc.Use the finite element simulation analysis of the metal magnetic flux leakage internal detection technology,and establish the equation according to the metal magnetic flux leakage internal finite element analysis theory to select the appropriate internal detection device and software,and construct the finite element simulation model reconstruction experiment.Analyze the results of the finite element simulation model parametrically,and realize the quantitative research on the size of pipeline defects and the degree of metal loss.The experimental results show that the internal detection technology has a lower loss rate in pipeline management and maintenance,and is more suitable for the conclusion of metal pipeline detection.