Research on leakage positioning method of underground gas extraction main pipeline based on transient model
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摘要: 针对现有煤矿井下瓦斯抽采主管道漏点定位大多采用单一定位方法，存在适用性差、效率低、易受环境影响等问题，结合流量平衡法、负压波法和小波降噪原理，提出了一种基于瞬态模型的井下抽采主管道泄漏定位方法。首先分析了管道首末两端流量变化规律及差值大小，排除干扰信号，利用流量平衡法对管道泄漏状态进行定性分析，判断管道是否泄漏：比较正常运行及发生泄漏情况下的流量变化，当管道首末两端流量差大于管道流量差阈值时，即为工况改变或发生泄漏；然后根据负压波在管道内的传播机理，采用小波降噪技术对压力信号进行消噪处理，结合邻域差值法寻求信号突变点；最后通过泄漏定位公式计算漏点位置，从而实现对管道漏点位置的有效定位。仿真分析结果验证了该方法的准确性。Abstract: At present, most of the existing positioning methods of underground gas extraction main pipeline leakage in coal mines use single positioning method. The problems of these methods include poor applicability, low efficiency and susceptibility to environmental impact. In order to solve the above issues, this paper proposes a leakage positioning method of underground gas extraction main pipeline based on transient model by combining flow balance method, negative pressure wave method and wavelet noise reduction principle. Firstly, the method analyzes the flow change law and the difference of the both ends of of the pipeline, eliminate the interference signal, use the flow balance method to identify the pipeline leakage state and determine whether the pipeline is leaking. The method compares the flow changes under normal operation and leakage. When the difference between the both ends of the pipeline flow is greater than the threshold value of the pipeline flow difference, it means that the working conditions have changed or leakage occurs. Secondly, according to the propagation mechanism of negative pressure waves in the pipeline, wavelet noise reduction technique is used to denoise the pressure signal. The neighborhood interpolation method is applied to seek the signal mutation point. Finally, the leak location formula is used to calculate the leak position so as to obtain the leak position of the pipeline effectively. The simulation analysis results verify the accuracy of the method.
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期刊类型引用(11)
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