Gas pipeline leakage detecting and positioning device and method thereof

Abstract

The invention discloses a gas pipeline leakage detecting and positioning device and a method based on transient model method, which belong to the technical field of failure diagnosis and flow safety security. The detecting device comprises a sensor group, a signal pre-processing device, an I / V plate, a collecting card, a voltage-stabilized power supply, and an operating condition machine; the detecting method includes of establishing a math model for the liquid flowing in the pipe, solving the flow parameters change in the pipe through a computer under a certain boundary condition, and comparing the model calculating values with the true measuring values at the pipe end; when the difference of the true measuring values and calculating values exceeds a certain range, then a leakage can be identified, and the leakage is positioned through a pressure gradient method. The invention provides a leakage detecting method based on the transient model method, and has the advantages of less investment, high sensitivity and good adaptability, and can be used for detecting and positioning gas leakage and leakage point for on-site gas pipeline.

Description

Technical field: [0001] The invention relates to a pipeline leak detection and positioning device and a detection and positioning method, in particular to a gas pipeline leakage detection and positioning using a transient model method, and belongs to the technical field of fault diagnosis and flow safety guarantee. Background technique: [0002] Natural gas pipeline leak detection methods are roughly divided into three categories: one is the in-pipe detection method based on magnetic flux, eddy current, camera and other ball-passing technologies, which is called pipeline crawler (Pig). This method is accurate in positioning, but it has high requirements on pipeline conditions, and accidents such as blockage and outage are prone to occur in actual use and cannot be detected online. The second type is the external detection method based on pipeline pressure, temperature, flow, vibration and other operating parameters. There are many applications such as flow difference, pressu...

AI Technical Summary

Problems solved by technology

This method is accurate in positioning, but it has high requirements on pipeline conditions, and accidents such as blockage and outage are prone to occur in actual use and cannot be detected online

The second type is the external detection method based on pipeline pressure, temperature, flow, vibration and other operating parameters. There are many applications such as flow difference, pressure difference, negative pressure wave and sound wave method. These methods are relatively low in cost and can be continuously detected online. However, the accuracy of positioning is low, and the rate of missed and false alarms of leakage accidents is high. In the true sense, engineering applications still need to do a lot of work

The third category is many auxiliary means developed based on manual inspection, such as: portable / vehicle-mounted infrared, laser gas detectors, leak noise detectors and other instruments, as well as specially trained animals, etc. This type of method is labor-intensive and cannot achieve continuous inspection. real-time online detection

Among them, the distributed optical fiber method needs to install data transmission, optical fiber sensor and supporting software system, the investment is very high, and the construction and maintenance are inconvenient. The optical fiber vibration sensor is a precision electronic instrument, which requires high accuracy and directly affects the detection effect; acoustic wave detection Installing data transmission and sound wave sensors and supporting software systems by method, the investment will be very high, and it is easily disturbed by the noise of the external environment, requiring high filtering effect

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