Abstract:

Aiming to resolve the deficiencies of low accuracy and poor anti-interference ability of traditional thermal pipeline-leakage detection methods,an distributed optical-fiber temperature-measurement system combined with the pipeline-leakage model is adopted herein to measure the temperature field along the thermal pipeline.When the leakage occurs, hot water or steam in the pipeline will flow out and change the temperature field around the leakage point, and the system can rapidly catch the temperature change and locate the leakage. The experimental results show that the temperature accuracy,which is the error between the measuring temperature value and the true value, is within ±1 ℃ and the spatial resolution is no more than 2 m.The system has been successfully applied to the thermal pipeline of the Jining Canal Power Plant, accurately measured the temperature variation along a 15 km thermal pipeline and precisely alerted a leakage, indicating that the distributed optical-fiber temperature-measurement system has a broad application prospect in the field of thermal pipeline-leakage monitoring.

Key words: thermal pipeline, leakage location, distributed optical-fiber temperature-measurement, spatial resolution