Gas pipeline leakage prevention monitoring system

Abstract

An anti-leakage monitoring system for a gas pipeline relates to the technical field of natural gas pipeline monitoring and comprises a monitoring network consisting of control valves arranged along the pipeline at intervals and a matched flow sensor B, and primary positioning of the leakage section is realized by combining data comparison of the flow sensor B at the upstream of each control valve. The innovatively-configured leakage point detector is internally provided with a sound sensor, a miniature positioning tracker and a conical flow guide cover and is driven by pipeline airflow to move, and the coordinates of a leakage point are accurately positioned through fusion of a sound intensity change curve and real-time positioning data. The system is provided with a composite monitoring unit with a protection box, an electronic combustible gas alarm and a wireless transmission module are integrated, and dual leakage early warning is achieved. A specially-arranged test injection system can inject gas into a target section in a pressurized mode, and the detection sensitivity is improved by enhancing leakage sound signals. According to the system, flow difference analysis, acoustic detection and intelligent positioning technologies are integrated, a multi-stage leakage detection system is formed, and the pipeline leakage diagnosis precision and the first-aid repair efficiency are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of natural gas pipeline monitoring technology, and in particular relates to a gas pipeline leak prevention monitoring system. Background Technology

[0002] In the design of natural gas pipeline systems, the placement of valves is crucial, directly impacting transportation safety and efficiency. The number of valves must be determined based on a comprehensive consideration of pipeline length, diameter, operating pressure, and ease of maintenance.

[0003] Natural gas pipelines include trunk lines and distribution lines. The drawback of existing technology is that it is usually impossible to accurately determine the location of leaks, which leads to untimely repairs, long leak times, large leak volumes, and serious losses. Utility Model Content

[0004] To address the problem mentioned in the background art of not being able to accurately determine the leak point after a natural gas pipeline leak, this utility model provides a gas pipeline leak prevention monitoring system. This utility model has two systems. One system can monitor the gas pipeline leak in real time, and after a leak is detected, the other system can accurately detect the leak point location, thereby enabling timely repairs and reducing losses.

[0005] The technical solution provided by this utility model is: a gas pipeline leak prevention monitoring system, including a gas pipeline, with flow sensors A installed at the beginning and end of the gas pipeline for monitoring the flow rate inside the gas pipeline, and control valves distributed at intervals along the gas pipeline, the control valves being located above the ground, and a flow sensor B installed on the gas pipeline upstream of each control valve; since both flow sensors A and B detect the flow rate inside the same gas pipeline, theoretically, the values ​​of flow sensors A and B are equal. If there is a difference between the values ​​of flow sensors A and B, and the difference is greater than the expected error value, it is determined that a leak has occurred in the gas pipeline.

[0006] The gas pipeline leak prevention monitoring system also includes a leak detector, a wireless receiving module A, and a client A. Upon detecting a leak, a leak detector is placed into the gas pipeline. The outer diameter of the leak detector is smaller than the inner diameter of the gas pipeline, facilitating its movement within the pipeline. The leak detector contains a sound sensor, wireless transmission module A, a miniature positioning tracker, and a battery. The sound sensor is electrically connected to wireless transmission module A, which is communicatively connected to wireless receiving module A, which in turn is communicatively connected to client A. The miniature positioning tracker is also communicatively connected to client A. As the system approaches the leak, the sound sensor detects the sound emanating from the leak point increasing in volume. When the sound begins to diminish, it indicates that the sound sensor has passed the leak point and is moving away from it. The sound signal is transmitted to client A via wireless transmission module A and wireless receiving module A. Client A also receives location information from the miniature positioning tracker, thus accurately determining the location of the leak and enabling accurate excavation and repair in the future.

[0007] A further technical solution is as follows: The gas pipeline leak prevention monitoring system also includes a test injection system. An injection port is installed on the gas pipeline downstream of each control valve. The test injection system includes an injection pipe, an injection pump, a gas storage tank, and a pressure gauge. One end of the injection pipe is connected to the injection port, and the other end is connected to the outlet of the injection pump. The inlet of the injection pump is connected to the gas storage tank. The pressure gauge is installed on the injection pipe. Because the flow sensors B, which are spaced apart, can already determine which section of the gas pipeline has a leak, it is only necessary to insert a leak detector into the corresponding injection port. The function of the injection pump is to increase the gas pressure in that section of the gas pipeline, making the sound of the leak louder and easier for the sound sensor to detect the location of the leak.

[0008] A further technical solution is that a conical shroud is provided on the outer wall of the leak detector, with the large-diameter end of the shroud facing upstream of the airflow, so that the airflow in the gas pipeline pushes the conical shroud to move. The conical shroud can prevent the leak detector from being stuck in the gas pipeline.

[0009] A further technical solution is as follows: A protective box is installed outside the control valve and flow sensor B. An electronic combustible gas alarm and a wireless transmission module B are installed inside the protective box. The flow sensor B and the electronic combustible gas alarm are respectively connected to the wireless transmission module B. The flow information and the information on whether there is a gas leak in the protective box are transmitted remotely through the wireless transmission module B. The gas pipeline leak prevention monitoring system also includes a wireless receiving module B and a client B. The wireless transmission module B is communicatively connected to the wireless receiving module B, and the wireless receiving module B is communicatively connected to the client B.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. This application comprises two systems. One system consists of flow sensor A, flow sensor B, a combustible gas alarm, wireless transmission module B, wireless receiving module B, and client B. This system determines whether a leak has occurred and the location of the leak point by monitoring changes in the readings of flow sensors A and B. The other system consists of a sound sensor, wireless transmission module A, a miniature positioning tracker, wireless receiving module A, and client A. This system accurately determines the leak location by detecting changes in the signal strength of the sound sensor and the position of the miniature positioning tracker. The first system operates under normal conditions, while the second system operates after a leak has occurred. The design of these two systems significantly increases the accuracy of leak detection, enabling timely repairs and minimizing losses.

[0012] 2. The test injection system in this application is used to increase the internal pressure of the gas pipeline at the leak point, forcing the leak sound to become louder, thereby ensuring that the sound sensor detects the location of the leak. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the utility model under normal operating conditions.

[0014] Figure 2 This is a schematic diagram of the test injection system connection.

[0015] Figure 3 This is a schematic diagram of the leak detector.

[0016] Figure 4 This is a block diagram of the workflow of one of the systems in this application.

[0017] Figure 5 This is a block diagram of another system workflow of this utility model.

[0018] In the diagram: 1. Flow sensor A; 2. Gas pipeline; 3. Flow sensor B; 4. Protective box; 5. Control valve; 6. Electronic combustible gas alarm; 7. Injection port; 8. Injection pipe; 9. Pressure gauge; 10. Gas pump; 11. Gas storage tank; 12. Leak detector; 1201. Sound sensor; 1202. Wireless transmission module A; 1203. Battery; 1204. Miniature positioning tracker; 1205. Conical cover. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] This embodiment includes a gas pipeline 2. Flow sensors A1 for monitoring the flow rate within the gas pipeline 2 are installed at both the beginning and end of the pipeline. Control valves 5 are spaced apart along the pipeline. During leak repair, the control valves 5 are closed, cutting off a portion of the gas pipeline 2. The control valves 5 are located above ground. A flow sensor B3 is installed upstream of each control valve 5 on the gas pipeline 2. Since both flow sensors A1 and B3 detect the flow rate within the same gas pipeline 2, theoretically, their values ​​should be equal. If there is a difference between the values ​​of flow sensors A1 and B3, and this difference exceeds the expected error value, a leak is determined in the gas pipeline 2. The approximate location of the leak can also be determined from the value of the flow sensor B3. For example, if the value of one flow sensor B3 is less than the value of an upstream flow sensor B3, a leak is determined to exist in the section between these two flow sensors B3.

[0021] The gas pipeline leak prevention monitoring system also includes a leak detector 12, a wireless receiving module A, and a client A. Upon detecting a leak, a leak detector 12 is inserted into the gas pipeline 2 through the injection port 7. The outer diameter of the leak detector 12 is smaller than the inner diameter of the gas pipeline 2, facilitating its movement within the pipeline 2. The leak detector 12 contains a sound sensor 1201, a wireless transmission module A1202, a miniature positioning tracker 1204, and a battery 1203. The battery 1203 powers the sound sensor and provides power to the wireless transmission module A1202. The wireless transmission module A1202 is electrically connected to the sound sensor, and the wireless transmission module A1202 communicates with the external wireless receiving module A. The wireless receiving module A communicates with the client A, and the miniature positioning tracker 1204 communicates with the client A. As the system approaches the leak, the sound sensor 1201 detects that the sound emanating from the leak is increasing in volume. When the sound begins to diminish, it indicates that the sound sensor 1201 has passed the leak and is moving away from it. The sound signal is transmitted to client A via wireless transmission module A1202 and wireless receiving module A. Client A also receives location information from the miniature positioning tracker 1204. Based on the convergence of this information, the location of the leak is accurately determined, enabling accurate excavation and repair in the later stages. The miniature positioning tracker 1204 is a button-type device, which is smaller in size.

[0022] A protective enclosure 4 is installed outside the control valve 5 and the flow sensor B3. An electronic combustible gas alarm 6 and a wireless transmission module B are installed inside the protective enclosure 4. The flow sensor B3 and the electronic combustible gas alarm 6 are electrically connected to the wireless transmission module B. The wireless transmission module B transmits flow information and information on whether there is a gas leak inside the protective enclosure 4. The gas pipeline 2 leak prevention monitoring system also includes a wireless receiving module B and a client B. The wireless transmission module B and the wireless receiving module B are communicatively connected, and the wireless receiving module B and the client B are also communicatively connected. This system can detect the presence of leaks, determine the location of leaks, and identify whether the leak originates from a flange connection inside the protective enclosure 4 (the probability of a flange connection leak is higher than that of a welded connection; therefore, it is necessary to install an electronic combustible gas alarm 6 at the flange connection in each compartment).

[0023] The gas pipeline leak prevention monitoring system also includes a test injection system. An injection port 7 is installed on the gas pipeline 2 downstream of each control valve 5. The test injection system includes an injection pipe 8, an injection pump 10, a gas storage tank 11, and a pressure gauge 9. One end of the injection pipe 8 is connected to the injection port 7, and the other end is connected to the outlet of the injection pump 10. The inlet of the injection pump 10 is connected to the gas storage tank 11. The pressure gauge 9 is installed on the injection pipe 8. Because the flow sensors B3, which are spaced apart, can already determine which section of the gas pipeline 2 has a leak, it is only necessary to insert a leak detector 12 into the corresponding injection port 7. The function of the injection pump 10 is to increase the gas pressure in that section of the gas pipeline 2. Increased gas pressure accelerates the leakage rate, making the sound of the leak louder, thus ensuring that the sound sensor 1201 detects the location of the leak.

[0024] The leak detector 12 has a conical cover 1205 on its outer wall, with the large-diameter end of the conical cover 1205 facing upstream of the airflow, so that the airflow in the gas pipeline 2 pushes the conical cover 1205 to move. The conical cover 1205 can prevent the leak detector 12 from being stuck in the gas pipeline 2.

Claims

1. A gas pipeline leak prevention monitoring system comprising a gas pipeline (2) having control valves (5) distributed at intervals, characterized in that: The beginning and end of the gas pipeline (2) are respectively provided with flow sensors A (1) for monitoring the flow in the gas pipeline (2), and the control valves (5) are arranged on the ground in a spaced manner on the gas pipeline (2), and a flow sensor B (3) is arranged on the gas pipeline (2) upstream of each control valve (5); The gas pipeline (2) leak-proof monitoring system further comprises a leak point detector (12), a wireless receiving module A and a client A, the outer diameter of the leak point detector (12) is smaller than the inner diameter of the gas pipeline, the leak point detector (12) is internally provided with a sound sensor (1201), a wireless transmission module A (1202), a micro positioning tracker (1204) and a battery (1203), the sound sensor (1201) is electrically connected with the wireless transmission module A (1202), the wireless transmission module A (1202) is in communication connection with the wireless receiving module A, the wireless receiving module A is in communication connection with the client A, and the micro positioning tracker (1204) is in communication connection with the client A.

2. A gas pipeline leak detection monitoring system according to claim 1, wherein: The gas pipeline (2) leak-proof monitoring system further comprises a test injection system, an injection port (7) is arranged on the gas pipeline (2) downstream of each control valve (5), and the test injection system comprises an injection pressure pipe (8), an injection gas pump (10), a gas storage tank (11) and a pressure gauge (9), one end of the injection pressure pipe (8) is connected with the injection port (7), the other end of the injection pressure pipe (8) is connected with the outlet of the injection gas pump (10), the inlet of the injection gas pump (10) is connected with the gas storage tank (11), and the pressure gauge (9) is arranged on the injection pressure pipe (8).

3. The gas pipeline leak detection system of claim 1, wherein: A conical cover (1205) is arranged on the outer wall of the leak point detector (12), the large-diameter end of the conical cover (1205) faces the upstream of the gas flow, so that the gas flow in the gas pipeline (2) drives the conical cover (1205) to move.

4. The gas pipeline leak detection system of claim 1, wherein: A protection box (4) is arranged outside the control valve (5) and the flow sensor B (3), an electronic combustible gas alarm (6) and a wireless transmission module B are arranged in the protection box (4), the flow sensor B (3) and the electronic combustible gas alarm (6) are respectively in electrical connection with the wireless transmission module B, the flow information and the information whether the protection box (4) leaks are transmitted together through the wireless transmission module B, the gas pipeline (2) leak-proof monitoring system further comprises a wireless receiving module B and a client B, the wireless transmission module B is in communication connection with the wireless receiving module B, and the wireless receiving module B is in communication connection with the client B.

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