Monitoring device and method for precisely distinguishing external leakage of heat supply network

Abstract

The invention discloses a monitoring device and method for precisely distinguishing external leakage of a heat supply network. The device comprises a monitoring center, an impedance sensing line, an optical fiber monitoring line, a plurality of monitoring nodes and a plurality monitoring substations. The monitoring center comprises a GIS data processor, a server, an alarming device, a display device and a first wireless communication device. The server is connected with the GIS data processor, the alarming device, the display device and the first wireless communication device. Each monitoringnode comprises an impedance sensor and a GIS data collector. The impedance sensing line is connected with the impedance sensors through guide wires, and each impedance sensor comprises a data collecting module and a data transmission module. The impedance sensors transmit data collected by a data transmission module to the nearest monitoring substation, and the GIS data collectors are connected with the GIS data processor. According to the monitoring device and method for precisely distinguishing external leakage of the heat supply network, tiny leakage of the heat supply network can be monitored, and leakage outside the heat supply network can also be judged.

Description

technical field [0001] The invention relates to the technical field of heating network operation leakage monitoring, in particular to a monitoring device and method for accurately distinguishing external leakage of a heating pipe network. Background technique [0002] At present, there are many monitoring methods for heating pipeline leakage, but each has its own advantages and disadvantages and cannot meet the requirements at the same time. Leakage monitoring based on the resistance method to monitor the water content, the system is simple and reliable and can be applied to long-distance transmission, the positioning accuracy is 0.2%, the disadvantage is that it can only monitor the leakage but cannot distinguish the internal and external leakage, and the traditional wiring method is too much in important parts. Simple, the system will only respond when the leakage reaches a certain level, the monitoring accuracy is low, and the larger the pipe diameter, the more obvious th...

AI Technical Summary

Problems solved by technology

[0002] At present, there are many monitoring methods for heating pipeline leakage, but each has its own advantages and disadvantages and cannot meet the requirements at the same time

Leakage monitoring based on the resistance method to monitor the water content, the system is simple and reliable and can be applied to long-distance transmission, the positioning accuracy is 0.2%, the disadvantage is that it can only monitor the leakage but cannot distinguish the internal and external leakage, and the traditional wiring method is too much in important parts. Simple, the system will only respond when the leakage reaches a certain level, the monitoring accuracy is low, and the larger the pipe diameter, the more obvious this defect is

The distributed optical fiber monitoring method based on temperature monitoring has a long monitoring distance and a high accuracy of up to 1 meter. The disadvantage is that the leakage of the outer casing cannot be monitored, and only the temperature change will be sensed by the system.

The acoustic wave monitoring method based on the leakage sound can only detect the leakage of the pipeline, and cannot detect the leakage of the outer casing.

In addition, various monitoring methods such as manual inspection method, temperature measurement method, isolation method, valve listening method, and ground listening method can only be detected after pipeline leakage, and cannot monitor the leakage of the outer casing.

[0003] In the leakage caused by the outer shell of the pipeline insulation, a large part is due to the intrusion of external water at the joint position due to construction, material and other problems. The water volume in this part is small and the intrusion is slow. Small intrusions may be directly evaporated, and cannot be detected by the impedance sensing line originally laid at one end of the pipe. The larger the diameter of the pipe, the more obvious this problem

If things go on like this, only when the thermal insulation material is damaged in a large area at the joint, the small amount of water can be detected. At this time, the steel pipe in the damaged part has been corroded, and the best repair time is lost, which will also bring great trouble to the maintenance. If the steel pipe Severe corrosion will also bring about the consequences of stopping heating

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