埋地管道脉冲激励连续电磁检测技术研究

发布时间：2018-01-27 00:22

本文关键词： 埋地管道脉冲激励瞬变电磁法腐蚀检测　出处：《南昌航空大学》2015年硕士论文　论文类型：学位论文

【摘要】：管道运输在国民生产、生活中占有重要地位,保障管道运输安全意义重大。然而,随着服役时间的增加,大量管线尤其是埋地管线逐渐进入事故频发的“中老龄”时期,定期、有针对性地进行管道修补与替换显得十分必要。腐蚀是导致埋地管道失效的主要原因之一,针对这一问题,本文提出了基于瞬变电磁法(TEM)的脉冲激励连续电磁检测方法,可对埋地管道进行非开挖腐蚀评价,检测效率高且准确性较好。本文首先介绍了埋地管道失效的原因及现有的非开挖检测方法,并论述了脉冲激励连续检测的相关理论,包括TEM用于埋地管道检测的原理、检测过程中产生的各信号特征、连续检测的可行性与后期数据处理中的剩余壁厚反演方法等。其次,讨论了传感器装置中的发射线圈与接收线圈参数对检测结果的影响,并结合理论计算与试验对传感器进行了优化设计,对加补偿线圈与磁芯这两种优化后的传感器性能进行了分析。然后,结合室内试验环境,对连续检测方法与传统定点检测方法的检测效果进行了对比,验证了连续检测方法的可行性、准确性及其高效性,此外,还通过相应试验及讨论,对影响连续检测结果的因素与加磁芯的传感器性能分别进行了分析与验证。最后,介绍了本文所述方法在实际应用中的检测流程,通过实际工程应用进一步验证了脉冲激励连续检测方法的可行性。本课题的研究丰富了埋地管道非开挖腐蚀检测方法,对指导在役埋地管道安全运营有一定现实意义。
[Abstract]:Pipeline transportation plays an important role in national production and daily life. It is of great significance to ensure the safety of pipeline transportation. However, with the increase of service time. A large number of pipelines, especially buried pipelines, have gradually entered the "middle and old age" period of frequent accidents. It is necessary to repair and replace pipelines. Corrosion is one of the main causes of pipeline failure. In this paper, a pulse excited continuous electromagnetic detection method based on transient electromagnetic method (TEM) is proposed, which can be used to evaluate the corrosion of buried pipelines without excavation. The detection efficiency is high and the accuracy is good. Firstly, this paper introduces the reasons of buried pipeline failure and the existing non-excavation detection methods, and discusses the theory of pulse excitation continuous detection. It includes the principle of TEM used in buried pipeline detection, the characteristics of signals generated in the detection process, the feasibility of continuous detection and the inversion method of residual wall thickness in later data processing. Secondly. The influence of the parameters of the transmitting coil and the receiving coil in the sensor device on the detection results is discussed, and the optimal design of the sensor is carried out in combination with the theoretical calculation and the experiment. The performance of the two optimized sensors with compensation coil and magnetic core is analyzed. Then, combined with the indoor test environment, the detection effect of the continuous detection method and the traditional fixed-point detection method is compared. The feasibility, accuracy and efficiency of the continuous detection method are verified. In addition, the corresponding experiments and discussions are carried out. The factors affecting the continuous detection results and the performance of the sensor with magnetic core are analyzed and verified respectively. Finally, the detection flow of the method described in this paper in practical application is introduced. Through the practical engineering application, the feasibility of the pulse excitation continuous detection method is further verified. The research of this topic enriches the non-excavation corrosion detection method of buried pipeline. It is of practical significance to guide the safe operation of buried pipeline in service.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U178

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