Wall thickness monitoring of shale gas pipeline based on flexible array piezoelectric sensor
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摘要: 页岩气管道结构复杂,存在曲面、弯头、三通、四通等结构,而且冲蚀与腐蚀造成的壁厚变化区域较大且规律不均匀,导致常规单点超声监测方法难以实现页岩气管道壁厚全覆盖有效监测,带来壁厚变化危险点漏检的风险。为此,针对页岩气管道大面积、高精度、高温(100℃)壁厚在线监测难点,提出了基于柔性阵列压电传感的页岩气管道壁厚监测方法,初步设计制作了耐高温多通道柔性阵列压电传感系统,并进行高温、振动、精度和长期监测试验。试验结果表明,该监测方法具有较高的精度和稳定性,可实现页岩气管道壁厚长期大面积监测,为页岩气管道的安全运行与维护提供了一定参考。Abstract: The structure of shale gas pipelines is complex, with surface structures such as curved surfaces, elbows, tees, crosses, etc., and the wall thickness variation area caused by erosion and corrosion is large and irregular. This makes it difficult for conventional single-point ultrasonic monitoring methods to achieve full-coverage monitoring of shale gas pipeline wall thickness, which may result in undetected dangerous points of wall thickness change. Therefore, aiming at the difficulties in online monitoring of large-area, high-precision and high-temperature (100 ℃) wall thickness of shale gas pipelines, a wall thickness monitoring method based on flexible array piezoelectric sensor was proposed. A high temperature resistant multi-channel flexible array piezoelectric sensing system was designed and fabricated, and high temperature, vibration, precision and long-term monitoring tests were carried out. The test results show that the new monitoring method has high accuracy and stability, and can realize long-term large-area monitoring of the wall thickness of shale gas pipelines, which provides conference for the safe operation and maintenance of shale gas pipelines.
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