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输油管道泄漏检测新方法与关键技术研究
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摘要
管道泄漏检测技术是保障管道安全生产的重要手段。近些年来,管道安全生产中提出了提高定位精度、检测小泄漏信号和降低误报警率等新的要求。基于瞬变流的实时模型法是近年来国际上着力研究的一种管道泄漏检测方法,因为在瞬变条件下即使发生微小的泄漏,在管道泄漏发生前后的压力波形都会存在一定的差别,与其他方法比较,这一方法可以更好地确定泄漏发生的位置。在长输管道泄漏检测领域,由于负压波法不需要建立复杂的数学模型,具有施工量小、成本低、维护方便等优点,得到了广泛的应用。我国已经在超过1万公里的原油管道上安装了基于负压波法的管道泄漏监测系统,对管道的安全运行作用显著。但负压波法在减少误报警率和提高定位精度方面还存在不足。
     本文针对现有输油管道泄漏检测技术存在的问题,在课题组前期研究基础上,提出了一种附加动态微压激励检测管道泄漏的新方法,并深入研究了输油管道泄漏检测中的若干关键技术。
     本文主要进行了以下几方面的研究工作:
     1、提出了一种附加动态微压激励检测管道泄漏的新方法,特别适合于小泄漏的检测,仿真结果表明其最小可检测量达到总流量的0.1%。
     2、采用了一种高灵敏度的动态压力变送器,捕捉泄漏引起的压力瞬变信号,通过现场实验对变送器的性能进行了验证。
     3、提出将基于小波包熵的检测信号特征提取方法、基于混沌特性的检测信号特征提取方法用于对管道动态压力信号的特征提取。
     4、针对负压波法的泄漏检测,将基于高阶统计分析的信号处理方法和基于Unscented卡尔曼滤波器(Unscented Kalman Filter,UKF)的信号处理方法用于管道泄漏信号处理,提高了泄漏定位的精度。
     5、研究了管道泄漏监测系统与SCADA系统结合的若干技术问题,设计了一套基于SCADA系统的管道泄漏监测系统。通过现场实验和实际应用,验证了系统的可靠性和准确性。
Pipeline leak detection technologies have been playing an important role in protecting the safety of pipeline transportation. In recent years, new requirements are proposed in the pipeline transportation field, such as improving location precision, detecting small leaks and reducing false alarm rate. On the one hand, the real-time model method based on transient flow is the focus of international research on pipeline leak detection methods in recent years, because even small leaks will produce a change of the pressure waveform in a pipeline transient event. Compared with other methods, the method mentioned above could get a better result of leak location. On the other hand, the negative pressure wave (NPW) method which does not require a complicated mathematical model, with the advantages of small construction quantity, low cost and convenient maintenance, has been widely used in the field of leak detection of long-distance pipelines. At present the length of crude oil pipelines installed with leak detection system based on the NPW method has already surpassed 10,000 km in China, which has played a significant role in the pipeline running safety. However, the NPW method has some shortcomings in reducing false alarm rate and improving location precison.
     Aiming at solving the problems existed in present leak detection technologies of crude oil pipelines, a new pipeline leak detection method based on an additional dynamic micro-pressure excitation is put forward, and a number of key technologies of leak detection for crude oil pipelines are studied thoroughly. The dissertation mainly covers the following aspects:
     1. A new pipeline leak detection method based on an additional dynamic micro-pressure excitation is proposed, particularly suitable for the detection of small leaks, which can detect the smallest amount of 0.1% of total flow.
     2. A high sensitive dynamic pressure transmitter is used to capture the transient signal caused by a leak, of which the performance is verified through field experiments.
     3. The signal feature extraction methods based on wavelet package entropy and the signal feature extraction method based on chaotic characteristics are applied to extracting the feature of the dynamic pressure signal along the pipelines.
     4. Aiming at the leak detection based on the NPW method, the signal processing method based on high-order statistic analysis and the signal processing method based on unscented kalman filter (UKF) are used to improve the location precison.
     5. A number of key technologies on combination of pipeline leak detection system with SCADA (Supervisory Control and Data Acquisition) system are investigated, and a leak detection system based on SCADA is designed, of which the reliability and accuracy are validated through field experiments and practical applications.
引文
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