Φ300mm管道漏磁檢測技術(shù)研究
[Abstract]:Pipeline plays an important role in the transportation of medium and material in petrochemical industry. The defect of pipe wall will affect its normal operation and lead to a series of production accidents. By using magnetic flux leakage detection technology, the defects of industrial pipelines can be surveyed in a wide range, and the corrosion severity of pipelines can be evaluated without affecting the normal operation of pipelines, and the safety of pipelines can be ensured. Based on the basic principle of magnetic flux leakage (MFL) detection technology, this paper takes the outer diameter 300mm pipeline as the concrete research object, carries on the pipeline outer wall inspection technology research. A 3D magnetic flux leakage detection model is established by using finite element simulation software on the outer wall of the pipeline, and the flux leakage distribution of the model is solved. The size and characteristics of tube wall defects were changed to extract magnetic flux density data from defects and to analyze and compare the influence of different parameters of defects on magnetic flux leakage. The results show that for cylindrical defects, the peak magnetic flux density increases first and then decreases with the increase of defect diameter, and increases with the increase of defect depth. The 3D distribution of flux density of magnetic flux coincides with the direction and distribution of the crack. In addition, the effect of defect group on magnetic field leakage is analyzed, and the lift height of the sensor is simulated and compared. It is found that the larger the lift value, the weaker the extracted magnetic leakage signal is, so it is expected that the lifting height will be reduced as much as possible in the detection. In order to obtain the best signal acquisition effect. After analyzing the simulation results, a magnetic flux leakage detection system is set up. Under laboratory conditions, the pipe with outer diameter 300mm is used to prefabricate cylindrical defects of different diameters of the same depth, cylindrical defects of different diameters and cracks of the same width and depth, and magnetic flux leakage testing experiments are carried out. For the experimental data processing, the leakage magnetic field law of the defect is analyzed by using the 3D data waveform and the signal acquisition curve of the upper channel of the defect, and it is found that it is consistent with the leakage magnetic field law obtained by the finite element simulation. The defect in the inner wall of the pipe is simulated to verify the effectiveness of the magnetic flux leakage detection device for the inner wall of the pipeline. On the basis of summing up the previous work, an automatic magnetic flux leakage detection device driven by motor and commutative is designed.
【學(xué)位授予單位】:東北石油大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TE973.6
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