储罐壁板缺陷的漏磁场信号研究

为实现储罐壁板腐蚀缺陷检测,保障储罐安全运行,开展罐壁腐蚀缺陷漏磁检测技术研究。基于漏磁检测原理,利用ANSYS仿真分析在壁板外侧周向励磁与轴向励磁方式下,不同位置(内壁、外壁)不同形状(圆柱形、圆锥形、半球形)的罐壁腐蚀缺陷漏磁场信号;并在实验室条件下开展缺陷检测试验,对仿真结果进行验证。研究表明:试验与仿真结果相同,周向励磁和轴向励磁2种励磁方式下所产生的缺陷漏场信号无明显差异;缺陷均能被检出;外壁缺陷的漏磁场信号强于内壁缺陷;缺陷直径、深度相同时,体积越大漏磁场信号越强。

Research on leakage magnetic field signals of tank wall defects

In order to detect the corrosion defects of tank wall and ensure the safe operation of tank,magnetic flux leakage testing technology for corrosion defects of tank wall was studied in this paper. Based on the principle of magnetic flux leakage detection,ANSYS was used to simulate and analyze the magnetic flux leakage signals of tank wall corrosion defects with different shapes(cylindrical, conical,hemispherical) at different positions(inner wall,outer wall) under the circumferential and axial excitation modes outside the wall,and the defect detection research was carried out under laboratory conditions to verify the simulation results. The results show that the experimental results are the same as the simulation analysis,that there are no significant differences in the leakage field signals generated by the two magnetization modes of the circumferential magnetization and the axial magnetization,that all defects can be detected,that the magnetic leakage signal of the outer wall defect is stronger than that of the inner wall defect,and that when the defect diameter and depth are the same,the larger the volume is,the stronger the magnetic leakage signal will be.