基于瞬态压力波法的输油管道泄漏检测技术研究

Study on technology of oil pipeline leakage detection based on dynamic pressure wave

近年来,油管道泄漏事故频繁发生,为保障管道安全运行和将泄漏事故造成的危害减少到最小,需要研究泄漏检测技术以获得更高的泄漏检测灵敏度和定位精度。针对输油管道的特点,分析了瞬态压力波泄漏检测技术的定位原理以及影响准确定位的关键因素,对热油输送管道沿程瞬态压力波传播速度的变化进行了研究。另外利用信号奇异点与小波变换模极大值在多尺度上变化对应的性质,将小波变换应用到扑捉泄漏压力信号序列的特征拐点中,使压力波时间差更加精确,从而有效提高了输油管道泄漏检测的定位精度。

Leakage accidents in oil pipeline transportation occur frequently in recent years.In order to guarantee the pipelines work safely and minimize the losses caused by leakage accidents,it is necessary to study leakage detecting technology to raise the sensitivity of leakage detection and accuracy of localization.Allowed to oil pipeline characteristics,analyze the principle of dynamic pressure wave leak detection technology and the key factors to influence accurate positioning.Taking account of the corresponding characteristic of the signal singularity and wavelet transform module maximum in multi-scale changing,the wavelet transform is applied to get the featured inflection point of pressure wave.As a result,the dynamic response time diversity between pressure sensors will be more precise,accuracy of localization to oil pipeline will be more improved.