摘要
针对高含硫天然气在集输过程中出现硫沉积现象的问题,探讨超声导波检测管内硫沉积层状况的可行性。采用Pcdisp软件求解频散方程,选取L(0,2)模态进行研究;在建立管道有限元模型的基础上,利用二维傅里叶变换识别信号的模态,结合超声导波反射与透射信号变化特征判断硫沉积层的状态。结果表明:使用反射回波法正向从管头激励1次定位硫沉积层首端位置后,再反向从管尾激励1次获得硫沉积层尾端位置,由2次位置之差可得硫沉积层长度;在算例分析中模拟位置、长度的相对误差绝对值分别在1.74%和2.58%以内;对于未知沉积量的管道,透射法可判断其为大量沉积还是微量沉积,若是大量沉积则使用透射法进行检测,相对误差绝对值在3%以内,若是微量沉积则使用反射法进行检测,相对误差绝对值在1.47%以内。
Currently,there is a lack of effective methods for detecting sulfur deposition.Ultrasonic guided waves offer convenient and non-destructive characteristics that make them a promising option for this purpose.To explore the feasibility of detecting sulfur deposits within pipelines using ultrasonic guided waves,dispersion equations were solved using PCdisp software.Wave structure diagrams for various modes were generated,with the L(0,2)mode selected for this study.A pipeline model was created using finite element analysis software,where the acoustic source excitation area is incident perpendicularly to the pipeline.A two-dimensional Fourier transform was applied to the acquired signals for mode identification.By varying the thickness of the sulfur deposit layer and analyzing the changes in reflection and transmission signals,a functional relationship was established between the transmission attenuation coefficient and the reflection coefficient concerning the radial deposition rate,thus enabling radial detection.The results indicate that the reflection echo method effectively measures the propagation time of guided waves.Combining this measurement with wave speed allows for the accurate localization of the starting position of the sulfur deposition layer.The forward reflection echo method is employed to excite waves from the pipe head,facilitating the location of the front end of the sulfur deposition layer.Subsequently,backward excitation from the pipe tail is used to identify the rear end of the layer.The length of the sulfur deposition layer is determined by subtracting the rear end position from the front end position.In cases of minor sulfur deposition,as the thickness of the sulfur deposition layer increases,more guided wave energy is reflected back to the excitation end at the boundary.Therefore,the reflection signal amplitude increases with the thickness of the sulfur layer,while the transmission signal amplitude decreases.In cases of substantial sulfur deposition,more guided wave energy is scattered within the layer as its thickness increases.Consequently,both the reflection and transmission signal amplitudes decrease with increasing sulfur layer thickness.In the numerical example analysis,the absolute values of the relative errors for simulated position and length were within 1.74%and 2.58%,respectively.For pipelines with unknown deposition amounts,the transmission method was employed to determine whether the deposition was substantial or minimal.If deemed substantial,the transmission method was applied,resulting in an absolute value of the relative error within 3%.Conversely,if the deposition was minimal,the reflection method was utilized,yielding an absolute value of the relative error within 1.47%.
作者
贺三
蒋雨霏
周艾妍
乔卉
易思婕
王圣毅
杨琛
HE San;JIANG Yufei;ZHOU Aiyan;QIAO Hui;YI Sijie;WANG Shengyi;YANG Chen(College of Oil and Gas Engineering,Southwest Petroleum University,Chengdu 610500,China;PetroChina Southwest Oil&Gasfield Company Gathering and Transportation Engineering Technology Institute,Chengdu 610041,China;PetroChina North China Oilfield Company,Cangzhou 062550,Hebei,China)
出处
《安全与环境学报》
北大核心
2026年第2期608-619,共12页
Journal of Safety and Environment
关键词
安全工程
超声导波
硫沉积
数值模拟
检测
safety engineering
ultrasonic guided waves
sulfur deposition
numerical simulation
detection
