Device and method for multi-point micro-leakage detection in pipeline water delivery system

Abstract

The invention discloses a pipeline water conveying system multi-point tiny leakage detection device and method. The method comprises the steps that transient drive signal generation equipment and a single-point pressure sensing unit are arranged at the tail end of a pipeline of a detected pipe net system to monitor tiny leakage points between the pipeline upstream position and the motivation position; the transient drive signal generation equipment is started, short-time drive signals are generated, and the single-point pressure sensing unit synchronously collects transient pressure signals; the transient pressure signals are analyzed, and the time and the reduced amplitude corresponding to pressure sudden change points of the first-phase pressure wave of the signals are analyzed; and the number of leakage points is identified according to the number of the pressure sudden change points of the first-phase pressure wave; and the position and leakage parameter of each leakage point are calculated according to the time and the reduced amplitude corresponding to each pressure sudden change point. The fact that the attenuation and distortion rule of the first pressure wave of transient water attack is different from that of single-hole leakage is utilized, multi-point and tiny leakage identification is conducted, simpleness and effectiveness are achieved, understanding is easy, the collected data volume is small, and reliability is high.

Description

technical field [0001] The invention relates to a leakage detection technology of a pipeline network system, in particular to a multi-point micro-leakage detection device and method for a pipeline water delivery system. Background technique [0002] Pipeline leakage is a ubiquitous phenomenon in the process of pipeline transportation of liquids, causing a lot of resource loss, energy waste and environmental pollution. Pipeline leakage detection mainly studies the theory and method of leakage early warning, monitoring and rapid and accurate positioning in pipeline water transmission projects, water transmission and distribution pipeline networks, and urban drainage pipeline networks, as well as related technologies for controlling and reducing pipeline leakage losses or poor production and sales. The management and maintenance, efficient and stable operation of drainage pipelines provide theoretical basis and technical reference. It is a hot demand in the current constructio...

AI Technical Summary

Problems solved by technology

The diameter of the pipes in the modern water delivery system is generally large. Considering safe operation, they are usually medium and low pressure. For example, the South Main Canal Project of the middle line of the South-to-North Water Diversion Project under construction has a single pipe diameter of 4.7m, and the design adopts the low-pressure pipe culvert artesian water delivery method; The general situation does not meet the conditions required by the current hydraulic transient leak detection method, because the lower the pipeline pressure, the harder it is to capture the transient pressure wave caused by the leak, and the lower the signal-to-noise ratio of the measured signal is, especially when the diameter of the leak hole is smaller. Hours, due to the small amount of leakage, the real signal is often covered under the interference signal (such as environmental noise, etc.), which makes the existing hydraulic transient leakage detection method invalid

[0010] (2) Existing leak detection methods and devices cannot detect many leak holes

Since the identification and location of leak points are generally aimed at the detection of a certain leak, and the actual water delivery system or municipal pipe network is controlled by pressure, when the local pipe section pressure is too high or affected by abrasion, wear, vibration, etc., sometimes There are two or more leaks at the same time. In this case, the general constant flow detection method often fails, and the attenuation and distortion of the transient water hammer caused by the two leaks are quite different from those of a single hole leak. A leak detection solution no longer applies

[0011] (3) The leakage transient detection method proposed by domestic and foreign research uses the rapid full closing or full opening of the valve at the end of the pipeline to generate flow pulses or equal-amplitude sinusoidal periodic disturbances and square wave disturbances. The water hammer pressure on the pipeline is relatively large, which does not meet the design , requirements, seeking a new excitation method similar to the transient flow effect caused by valve closing needs to be broken through

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