带包覆层管道腐蚀缺陷的弱磁检测技术研究

发布时间：2018-11-21 08:30

【摘要】：随着我国大力推进节约、环保能源的战略,能源的充分利用受到高度重视。因此,在许多工业领域中都采用了带包覆层结构的管道。该种管道结构可以防止其热能损失,提高介质转化参数,同时也可以减少受雨水等有害介质腐蚀的风险,提高管道运行年限。然而随着管道运行年限的增长,管道腐蚀的产生在所难免,这给管道运行带来了重大的安全隐患,因而迫切地需要一项检测技术对其进行无损检测,排除重大的安全事故。本文针对带有铝制包覆层铁磁性管道腐蚀进行了弱磁无损检测理论分析及实验研究。首先开展了铁磁性管道本体与带有包覆层铁磁性管道的检测对比实验,探讨带包覆层结构的管道腐蚀缺陷检测的可行性,并通过改变探头的布置方式进行腐蚀缺陷检测能力的对比,得出最佳的检测方式,继而进行改变保温层的厚度实验,分析保温层厚度的变化对弱磁检测信号的影响,证明了保温层在一定厚度的情况下,弱磁无损检测技术在带包覆层管道腐蚀缺陷检测的可靠性。然后结合弱磁信号的特点,针对该种管道信号进行了数据处理方式的研究,运用概率法及小波分析法进行缺陷的提取及判定,分析二者的优缺点,并对预制人工缺陷试板的检测信号进行特征量的分析,实现缺陷的定量研究。最后基于本文的研究内容及离散数据的二维成像分析,运用C#语言编写带包覆层铁磁性管道腐蚀缺陷检测系统的软件平台,实现了数据的采集、分析,缺陷的提取、定量,二维成像功能,并通过工业现场实践开展检测研究,检测结果均取得了良好的效果,进一步验证了带包覆层管道腐蚀缺陷的弱磁无损检测技术的可靠性,为后续的弱磁检测技术研究奠定了良好的基础。
[Abstract]:Along with our country vigorously promotes the conservation, the environmental protection energy strategy, the energy full utilization receives the high attention. Therefore, pipes with cladding structure have been adopted in many industrial fields. This kind of pipeline structure can prevent the loss of heat energy, improve the medium conversion parameters, reduce the risk of corrosion by Rain Water and other harmful media, and improve the service life of the pipeline. However, with the increase of pipeline service life, pipeline corrosion is inevitable, which brings great hidden trouble to pipeline operation. Therefore, a nondestructive testing technology is urgently needed to eliminate major safety accidents. Theoretical analysis and experimental study on corrosion of ferromagnetic pipe with aluminum coating are carried out in this paper. First of all, a comparative test between ferromagnetic pipe body and ferromagnetic pipe with coating layer is carried out, and the feasibility of corrosion defect detection of pipe with coating structure is discussed. By changing the arrangement of the probe to compare the ability of corrosion defect detection, the best detection method is obtained, and then the thickness of the insulation layer is changed, and the influence of the thickness of the insulation layer on the weak magnetic detection signal is analyzed. It is proved that the weak magnetic field nondestructive testing technology is reliable for the corrosion defect detection of pipeline with coating layer under the condition of a certain thickness of insulating layer. Then according to the characteristics of weak magnetic signal, the data processing method of this kind of pipeline signal is studied, and the defects are extracted and judged by using probability method and wavelet analysis method, and the advantages and disadvantages of the two methods are analyzed. The characteristic quantity of the test signal of the prefabricated artificial defect test plate is analyzed to realize the quantitative study of the defect. Finally, based on the research content of this paper and the two-dimensional imaging analysis of discrete data, the software platform of corrosion detection system for ferromagnetic pipeline with coated layer is compiled by C # language, which realizes the data collection, analysis, defect extraction and quantitative analysis. Two-dimensional imaging function, and through the industrial field practice to carry out the detection research, the test results have achieved good results, and further verify the reliability of the weak magnetic nondestructive testing technology with the corrosion defects of the coated pipeline. It lays a good foundation for the further study of weak magnetic field detection technology.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.4

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