基于磁—温梯度的供热管道检测技术研究

发布时间：2018-05-21 04:23

本文选题：管道泄漏 + 热力管道非开挖检测　；参考：《南昌航空大学》2017年硕士论文

【摘要】：随着我国北方供热管线管龄的增长,近年来城市热力管道出现了较多腐蚀泄漏问题,给城市供暖造成困难,且给供暖企业带来较大的经济损失。但目前,国内许多城市在供暖管道的泄漏定位方面特别缺乏专用的检测设备。针对上述情况,首先,课题通过对磁-温梯度检测原理进行相关的探讨和对热力管道失效原因进行分析,从理论上确立了磁-温梯度检测方法对城市供热管道泄露定位进行在役非开挖检测具有可行性。其次,对热力管道发生泄露时的磁场和温度信号进行计算机仿真,发现热力管道泄漏时,磁场信号和温度信号均发生了一定的变化,从理论数据上证明了热力管道在发生泄漏时通过探测磁场和温度信号的变化对泄漏点进行定位具有可能性。第三,在提离1.5m的情况下对含有特定刻槽缺陷的管道进行弱磁检测实验,证明弱磁检测对埋地热力管道泄漏点定位具有可靠性,定位误差在30cm以内。且研究了热力管道三种典型状态在计算机仿真下的磁-温梯度变化特点,并结合热力管道三种典型状态下的现场检测数据进行分析,论证了磁-温梯度检测技术在热力管道检测中的优越性。在此基础上,研制出一套热力管道非开挖检测仪器。最后,去往北方多个城市进行热力管道实地检测,在进行检测数据综合分析后,对泄漏点进行定位并开挖验证。开挖结果表明,基于磁-温梯度检测技术研制的热力管道检测仪器对埋地热力管道和露天的管沟敷设式热力管道的泄漏点进行定位的可靠性较高,其对泄漏点定位与实际位置偏差在0.30m以内,完全满足现场实际需求。课题为城市热力管道的泄漏检测提供了一种新型的检测方法,即结合弱磁检测技术和红外测温检测技术的磁-温梯度检测方法。该方法对复杂的路面环境具有良好的适应性,能适用于大部分热力管道的泄漏检测。
[Abstract]:With the increase of heating pipe age in northern China, there have been many corrosion and leakage problems in urban heating pipeline in recent years, which cause difficulties to urban heating and bring large economic losses to heating enterprises. But at present, many cities in our country lack special detection equipment in the leakage location of heating pipes. In view of the above situation, first of all, the paper discusses the principle of magnet-temperature gradient detection and analyzes the failure reason of thermal pipeline. The magnetic-temperature gradient detection method is theoretically established to detect the leakage location of urban heating pipeline without excavation in service. Secondly, the magnetic field and temperature signal of thermal pipeline leakage are simulated by computer, and it is found that both magnetic field signal and temperature signal have changed. It is proved from the theoretical data that it is possible to locate the leakage point by detecting the change of magnetic field and temperature signal when the thermal pipeline leaks. Thirdly, in the case of 1.5 m lift, the weak magnetic field detection experiment is carried out for the pipeline with special groove defect, which proves that the weak magnetic detection is reliable for the location of leakage point of buried thermal pipeline, and the positioning error is within 30cm. The variation characteristics of magnet-temperature gradient of three typical states of thermal pipeline under computer simulation are studied, and the field detection data of three typical states of thermal pipeline are analyzed. The superiority of magnetic-temperature gradient detection technology in thermal pipeline detection is demonstrated. On this basis, a set of non-excavation testing instrument for thermal pipeline has been developed. Finally, the thermal pipeline field inspection is carried out in many cities in the north. After comprehensive analysis of the test data, the leakage point is located and verified by excavation. The excavation results show that the reliability of detecting the leakage points of buried thermal pipelines and open-air trench laying thermal pipelines is high, which is based on the magnetic temperature gradient detection technology. The deviation between the leak location and the actual location is less than 0.30m, which fully meets the actual demand of the site. The subject provides a new detection method for the leakage detection of urban thermal pipeline, that is, the magnet-temperature gradient detection method combined with the weak magnetic field detection technology and the infrared temperature detection technology. This method has good adaptability to complex pavement environment and can be applied to the leakage detection of most thermal pipelines.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU995

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