天然气管道球阀内漏发声机理及检测试验

发布时间：2018-05-25 03:03

本文选题：天然气管道 + 球阀　；参考：《振动.测试与诊断》2017年03期

【摘要】：球阀作为高压天然气输送管道的主要设备,其内漏时的喷流气体会产生声发射信号,通过研究该声发射信号特征规律将有助于阀门内漏流量量化检测。针对这一问题,进行了天然气输送管道球阀内漏发声机理和检测试验研究,分析了阀门内漏声发射现象产生的机理和内漏流量检测评价方法。在此基础上,应用声发射检测系统对3种不同尺寸内漏球阀进行了检测试验,通过试验分析了球阀在不同内漏流量下的声发射信号频谱特征分布规律,并采用小波包分析方法进行信号特征参数(信息熵、均方根、频域峰值)提取。拟合特征参数与内漏流量关系曲线,采用R~2(确定系数)指标对曲线拟合程度进行评价,评价结果表明,采用均方根值(root mean square,简称RMS)的曲线拟合程度最高(R2为0.979),可以用于天然气输送管道球阀内漏流量的量化检测。
[Abstract]:Ball valve is the main equipment of high pressure natural gas pipeline. The acoustic emission signal will be produced when the gas is leaking inside the valve. The study of the characteristic law of the acoustic emission signal will be helpful to the quantitative detection of the leakage flow inside the valve. In order to solve this problem, the sound mechanism and testing test of inner leakage in ball valve of natural gas pipeline are studied, and the mechanism of acoustic emission in valve and the evaluation method of internal leakage flow are analyzed. On the basis of this, three kinds of inner leakage ball valves with different sizes are tested by using acoustic emission detection system, and the distribution law of spectrum characteristic of acoustic emission signals of ball valves under different internal leakage flow is analyzed. Wavelet packet analysis is used to extract the signal feature parameters (information entropy, root mean square, peak value in frequency domain). The fitting characteristic parameters and internal leakage flow curve are fitted, and the fitting degree of the curve is evaluated by using Rao _ 2 (determination coefficient) index. The evaluation results show that, The curve fitting degree of root-root mean squarewith RMS is 0.979, which can be used for quantitative detection of leakage flow in ball valve of natural gas pipeline.
【作者单位】：中国石油大学(北京)机械与储运工程学院;过程流体过滤与分离技术北京市重点实验室;中石油管道科技研究中心;中石油东部管道有限公司;
【基金】：国家自然科学基金资助项目(51106180) 中国石油天然气股份科技专项资助项目(2012E-2802)
【分类号】：TE973.6

【参考文献】