Ground gas pipeline facility leakage flow detection system

Abstract

The utility model provides a leakage flow detection system for ground gas pipeline facilities, and belongs to the technical field of urban gas safety. The leakage flow detection system for the ground gas pipeline facility comprises a sealing device used for wrapping a gas pipeline, a gas flow meter used for metering gas production flow, a gas extracting pump used for extracting gas in the sealing device, and a gas analyzer used for detecting the concentration of methane and / or ethane. According to the leakage flow detection system for the ground gas pipeline facility, the sealing device is arranged according to the installation scene of the ground gas pipeline, a more ideal semi-closed space can be formed, and the accuracy and effectiveness of measurement are improved; a methane / ethane analyzer arranged in the detection system adopts an infrared absorption spectrum technology and has the advantages of high precision, high sensitivity, high frequency, short response time and low power consumption, acquired data are more real and reliable, and leakage quantification is more accurate; the system equipment is simple and portable, easy to operate, low in starting difficulty and high in practicability.

Description

Technical Field

[0001] This utility model belongs to the field of urban gas safety technology, specifically relating to a leakage flow detection system for ground gas pipeline facilities. Background Technology

[0002] Urban gas operators are increasingly focusing on identifying safety hazards in pipeline transmission and distribution systems and assessing methane emissions. Portable methane / ethane gas analyzers are among the most widely used detection devices. High-flow-rate enclosed sampling detection using these devices is a common method for quantifying methane emissions from leak points. The principle is as follows: the enclosed detection device forms a semi-enclosed space with an inlet and a sampling interface. A vacuum pump captures gas from the sampling interface and introduces it into the analyzer. Finally, the methane leak flow rate is calculated based on the sampled flow rate and the measured concentration data.

[0003] Natural gas pipeline leak flow detection is a technique used to detect the presence and extent of leaks in natural gas pipelines. If a leak is detected, its severity can be determined by measuring the flow rate of the leaking gas. This is crucial for prioritizing repairs and assessing potential environmental and safety impacts.

[0004] However, conventional sealing devices are insufficient to collect leaked natural gas from gas pipelines on the ground, thus failing to achieve the desired sealing effect. Utility Model Content

[0005] The purpose of this utility model is to provide a ground gas pipeline facility leakage flow detection system for capturing and analyzing gas in a limited space on the ground, and calculating methane leakage flow based on the gas sampling flow and the measured concentration data. The ground gas pipeline facility leakage flow detection system includes a sealing device for wrapping the gas pipeline, a gas flow meter for measuring the gas sampling flow, a pump for extracting gas from inside the sealing device, and a gas analyzer for detecting the concentration of methane and / or ethane.

[0006] The sealing device is a hollow shell with one side open. The other sides of the sealing device form a semi-enclosed space, and the open side is connected to the semi-enclosed space. The two sides adjacent to the open side are provided with pipe grooves that penetrate the sides of the sealing device, allowing the gas pipeline to pass through the semi-enclosed space. Gas hoses are provided between the sealing device and the gas flow meter, between the gas flow meter and the gas pump, and between the gas pump and the gas analyzer. The gas hoses are used for gas transportation.

[0007] Preferably, the sealing device is a cube with a trapezoidal cross-section, the tube groove is disposed on the upper and lower bottom surfaces of the sealing device, and the rear side of the sealing device is an open surface;

[0008] The upper or lower surface of the sealing device is provided with a gas sampling port, which can be connected to a gas hose. The gas hose can be connected to the gas sampling port and extract gas from the semi-enclosed space.

[0009] Preferably, the pipe trench is elongated, with its length direction perpendicular to the open surface, and the end of the pipe trench away from the open surface is semi-circular, with the diameter of the semi-circular part not less than the diameter of the gas pipeline.

[0010] Preferably, the gas analyzer is a portable infrared absorption spectroscopy technology methane and / or ethane analyzer, which can achieve highly accurate detection of the concentration of methane and / or ethane in the gas.

[0011] Preferably, the ground gas pipeline facility leakage flow detection system further includes a position fixing component, which includes a fixed clamp and a movable clamp, as well as fasteners connecting the fixed clamp and the movable clamp;

[0012] The fixed clamp is located on the upper or lower bottom surface at the end of the pipe groove away from the open surface; the fixed clamp and the movable clamp are provided with arc-shaped grooves, and the arc-shaped groove on the fixed clamp is directly opposite the end of the groove.

[0013] The movable clamp and the fixed clamp can clamp the gas pipeline with fasteners to fix the position of the sealing device.

[0014] Preferably, the fastener includes a screw rod disposed on both sides of the arc-shaped groove of the movable clamp and a nut that matches the screw rod; the fixed clamp is provided with two through holes, the positions of which match the screw rod.

[0015] The screw on the movable clamp can pass through the through hole on the fixed clamp, and then the fixed clamp and the movable clamp are clamped together by the nut to fix the position of the sealing device.

[0016] Preferably, the ground gas pipeline facility leakage flow detection system further includes an end cap, which can cover and block the open surface; the end cap is provided with an extension mounting seat, the position of which corresponds to the position of the fixing clamp;

[0017] The extension mounting base is equipped with an arc-shaped groove and screws on both sides of the arc-shaped groove. The screws of the extension mounting base can pass through the through hole of the fixing clamp. By screwing a nut into the screw, the end cap and the sealing device can be fastened together and the sealing device can be fixed to the gas pipeline.

[0018] Preferably, a collection device is provided in the semi-enclosed space. The collection device has a semi-enclosed structure that can partially enclose the gas pipe passing through the slot. The inside of the collection device is hollow, and multiple air inlets are provided near the gas pipe.

[0019] A connecting pipe is provided between the gas collection device and the gas sampling port at the end inside the enclosed space; the gas hose can be connected to the end outside the enclosed space of the gas sampling port, and the gas hose can collect gas near the gas pipeline through the connecting pipe and the gas collection device.

[0020] Preferably, the collection device is a semi-circular pipe with the opening of the semi-circular pipe facing the groove, and the air inlet is set on the inner wall of the semi-circular pipe. The multiple air inlets are arranged along the axis of the semi-circular pipe.

[0021] As described above, the leakage flow detection system for ground gas pipeline facilities of this utility model features a sealing device designed for ground gas pipeline installation scenarios, which can form a more ideal semi-enclosed space, improving the accuracy and effectiveness of the measurement. The methane / ethane analyzer equipped with the detection system adopts infrared absorption spectroscopy technology, which has the advantages of high precision, high sensitivity, high frequency, fast response time and low power consumption, resulting in more authentic and reliable data and more accurate leakage quantification. The system equipment is simple, portable, easy to operate, and has low learning curve and high practicality. Attached Figure Description

[0022] The present invention will be more fully understood through the following detailed description and in conjunction with the accompanying drawings, wherein similar elements are numbered in a similar manner, wherein:

[0023] Figure 1 This is a diagram illustrating the usage status of the ground gas pipeline facility leakage flow detection system according to an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the sealing device of the ground gas pipeline facility leakage flow detection system according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the location fixing component of the ground gas pipeline facility leakage flow detection system according to an embodiment of this utility model;

[0026] Figure 4 This is an exploded view of the location fixing component of the ground gas pipeline facility leakage flow detection system according to an embodiment of this utility model;

[0027] Figure 5 This is a schematic diagram of the end cap of the ground gas pipeline facility leakage flow detection system according to an embodiment of the present utility model;

[0028] Figure 6 This is an exploded view of the end cap connection part of the ground gas pipeline facility leakage flow detection system according to an embodiment of this utility model;

[0029] Figure 7 This is a schematic diagram of the data acquisition device for the ground gas pipeline facility leakage flow detection system according to an embodiment of this utility model;

[0030] Figure 8 This is a cross-sectional view of the closed device of the ground gas pipeline facility leakage flow detection system with the acquisition device according to an embodiment of this utility model;

[0031] In the diagram: 11. Sealing device; 12. Gas flow meter; 13. Air pump; 14. Gas analyzer; 15. Pipeline; 16. Gas hose; 17. Wall; 18. Power supply; 21. Gas sampling port; 22. Gas pipeline; 31. Fixed clamp; 33. Movable clamp; 34. Arc-shaped groove; 35. Screw; 36. Nut; 41. End cap; 42. Extension mounting base; 51. Collection device; 52. Air inlet; 53. Connecting pipe. Detailed Implementation

[0032] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings, but this utility model is not limited to the following embodiments.

[0033] Urban gas operators are increasingly emphasizing the investigation of safety hazards in pipeline transmission and distribution systems and the assessment of methane emissions. Portable methane / ethane gas analyzers 14 are among the most widely used detection devices. High-flow-rate enclosed sampling detection using this device is a common method for quantifying methane emissions from leak points. The principle is as follows: the enclosed detection device forms a semi-enclosed space with a gas sampling port 21. A vacuum pump 13 captures gas from the sampling port into the analyzer. Finally, the methane leakage flow rate is calculated based on the gas sampling flow rate and the measured concentration data.

[0034] Natural gas pipeline leak flow detection is a technique used to detect the presence and extent of leaks in natural gas pipelines. If a leak is detected, its severity can be determined by measuring the flow rate of the leaking gas. This is crucial for prioritizing repairs and assessing potential environmental and safety impacts.

[0035] However, conventional sealing devices are insufficient to collect leaked natural gas from the gas pipeline 22 on the ground, and thus cannot achieve the desired sealing effect.

[0036] To address the aforementioned issues, this utility model provides a ground gas pipeline facility leakage flow detection system, which is used to capture and analyze gas within a confined space on the ground, and calculate the methane leakage flow based on the gas sampling flow rate and the measured concentration data. The ground gas pipeline facility leakage flow detection system includes a sealing device 11 for wrapping the gas pipeline 22, a gas flow meter 12 for measuring the gas sampling flow rate, a pump 13 for extracting gas from inside the sealing device 11, and a gas analyzer 14 for detecting the concentration of methane and / or ethane.

[0037] The sealing device 11 is a hollow shell with one side being an open surface. The other sides of the sealing device 11 form a semi-enclosed space, with the open surface communicating with the semi-enclosed space. Two sides adjacent to the open surface are provided with pipe grooves 15, which penetrate the sides of the sealing device 11, allowing the gas pipeline 22 to pass through the semi-enclosed space. Gas hoses 16 are provided between the sealing device 11 and the gas flow meter 12, between the gas flow meter 12 and the vacuum pump 13, and between the vacuum pump 13 and the gas analyzer 14. The gas hoses 16 are used for gas transportation.

[0038] In this embodiment, as Figure 1 , Figure 2 As shown, the enclosed device 11 is a shell with a hollow interior. The enclosed device 11 can be made of plastic or metal. The open side refers to the side where the open side is located without a shell, and the shells on the other sides form a semi-enclosed space. The open side connects the semi-enclosed space with the outside space.

[0039] The pipe groove 15 is provided on two sides adjacent to the open surface, and the two sides with the pipe groove 15 are opposite to each other. The pipe groove 15 is used to hold the gas pipeline 22 to be tested in the pipe groove 15 during the test. The sealing device 11 can form a relatively closed space around the gas pipeline 22.

[0040] In the specific implementation process, the open surface is mainly applicable to the gas pipe 22 that is close to the wall 17. The open surface faces the wall 17, the sealing device 11 is attached to the wall 17, the gas pipe 22 passes through the pipe groove 15, and the area to be detected on the gas pipe 22 is surrounded by the sealing device 11 and the wall 17.

[0041] The pump 13 in this embodiment is a vacuum pump 13. The vacuum pump 13 has very high efficiency and can extract a large amount of gas in a short time. Furthermore, the vacuum pump 13 has very stable performance and will not experience performance degradation due to prolonged use.

[0042] The vacuum pump 13 is connected to the gas flow meter 12 via a gas hose 16. The gas flow meter 12 is connected to the sealing device 11 via a gas hose 16. The vacuum pump 13 can extract gas from the semi-enclosed space and measure the gas flow rate through the gas flow meter 12.

[0043] The gas flow meter 12 is an instrument used to measure the velocity or flow rate of gas. It can measure various types of gases, including natural gas, oxygen, nitrogen, helium, etc. The gas flow meter 12 is commonly used in industrial production, scientific research experiments, environmental monitoring, and other fields.

[0044] The gas flow meter 12 in this embodiment is a dry flow meter. A dry flow meter is an instrument used to measure the flow rate of gas or liquid. Its characteristic is that the measured medium does not come into contact with the measuring components of the instrument during the measurement process, hence the name "dry." The main advantages of dry flow meters are simple structure, convenient maintenance, strong corrosion resistance, resistance to contamination by the measured medium, and high measurement accuracy. Furthermore, because the measured medium does not directly contact the measuring components, dry flow meters have a longer service life and are less prone to failure. Dry flow meters are widely used in various industrial fields such as petroleum, chemical, metallurgy, water treatment, food, and beverage industries for measuring and controlling fluid flow rates.

[0045] The suction port of the vacuum pump 13 is connected to the gas flow meter 12, and the outlet of the vacuum pump 13 is connected to the gas analyzer 14. The gas analyzer 14 is an instrument specifically designed for measuring and analyzing the composition of gases such as methane and ethane. It can accurately measure the content of methane and ethane in a gas sample, thereby helping users understand the specific composition and concentration of the gas.

[0046] In the specific implementation process, when carrying out detection tasks, the first step is to identify the location of the leak point, followed by the following operations:

[0047] (1) Turn on the gas analyzer 14 and detect it away from the leak point for 5 minutes to obtain the ambient background methane concentration;

[0048] (2) The sealing device 11 is clamped by the pipe groove 15 and pressed against the wall 17. The dry flow meter and vacuum pump 13 are connected in sequence through the gas hose 16.

[0049] (3) After connecting the power supply, turn on the vacuum pump 13 and continuously extract high-concentration methane gas in the semi-enclosed space for 5 minutes.

[0050] (4) Connect the outlet of the vacuum pump 13 and the input of the gas analyzer 14 through the gas hose 16 to form a complete buried natural gas pipeline leakage flow detection system. Detect for 5-10 minutes and record the methane concentration data during this period.

[0051] (5) Turn off the methane analyzer and dismantle the system.

[0052] This embodiment also includes a mobile power supply 18, which is used to power the vacuum pump 13 and the gas analyzer 14.

[0053] Furthermore, the sealing device 11 is a cube with a trapezoidal cross-section, the tube groove 15 is provided on the upper and lower bottom surfaces of the sealing device 11, and the rear side of the sealing device 11 is an open surface.

[0054] The upper or lower surface of the sealing device 11 is provided with a gas sampling port 21, which can be connected to a gas hose 16. The gas hose 16 can be connected to the gas sampling port 21 and extract gas from the semi-enclosed space.

[0055] In this embodiment, as Figure 2 As shown, the sealing device 11 for quantifying leaks in ground gas pipeline facilities is a trapezoidal cube structure with pipe grooves 15 on the upper and lower surfaces and a gas sampling port 21 on one side of the upper surface.

[0056] The pipe groove 15 is elongated, with its length direction perpendicular to the open surface. The end of the pipe groove 15 away from the open surface is semi-circular, and the diameter of the semi-circular part is not less than the diameter of the gas pipeline 22.

[0057] The pipe groove 15 includes a proximal end near the open surface and a distal end away from the open surface. The distal end of the pipe groove 15 is semi-circular, which is designed to match the cylindrical gas pipe 22. The proximal end of the pipe groove 15 is an elongated groove.

[0058] The gas analyzer 14 is a portable infrared absorption spectroscopy methane and / or ethane analyzer, which can achieve highly accurate detection of the concentration of methane and / or ethane in the gas.

[0059] The ground gas pipeline facility leakage flow detection system also includes a position fixing component, which includes a fixed clamp 31 and a movable clamp 33, as well as fasteners connecting the fixed clamp 31 and the movable clamp 33.

[0060] The fixed clamp 31 is located on the upper or lower bottom surface near the end of the pipe groove 15 away from the open surface; the fixed clamp 31 and the movable clamp 33 are provided with arc-shaped grooves 34, and the arc-shaped groove 34 on the fixed clamp 31 is directly opposite the end of the groove.

[0061] The movable clamp 33 and the fixed clamp 31 can clamp the gas pipeline 22 with fasteners to fix the position of the sealing device 11.

[0062] In this embodiment, the movable clamp 33 and the fixed clamp 31 are used to fix the sealing device 11 to the gas pipeline 22. In this embodiment, the fixed clamp 31 is fixedly connected to the upper bottom surface and the lower bottom surface of the sealing device 11. Specifically, the fixed clamp 31 can also be fixed to the upper bottom surface or the lower bottom surface of the sealing device 11.

[0063] like Figure 3As shown, an arc-shaped groove 34 is provided on one side of the fixed clamp 31. The arc-shaped groove 34 is used to fit with the gas pipeline 22. The position fixing component also includes a movable clamp 33. An arc-shaped groove 34 is also provided on one side of the movable clamp 33. The movable clamp 33 can clamp the gas pipeline 22 from both sides with the fixed clamp 31, so as to fix the sealing device 11 during the test.

[0064] In the specific implementation process, the fasteners can be buckles, bolts, nuts, etc. that can clamp and fix the clamp 31 and the movable clamp 33.

[0065] Furthermore, the fastener includes a screw 35 disposed on both sides of the arc-shaped groove 34 of the movable clamp 33 and a nut 36 that matches the screw 35; the fixed clamp 31 is provided with two through holes, the positions of which match the screw 35.

[0066] The screw 35 on the movable clamp 33 can pass through the through hole on the fixed clamp 31, and then the fixed clamp 31 and the movable clamp 33 are clamped by the nut 36 to fix the position of the sealing device 11.

[0067] In this embodiment, as Figure 4 As shown, the fastener can be a bolt set on the movable clamp 33. Two screws 35 are respectively set on both sides of the arc-shaped groove 34 of the movable clamp 33. The two screws 35 of the movable clamp 33 can pass through the two through holes at the corresponding positions on the fixed clamp 31. The nut 36 can limit the relative position of the fixed clamp 31 and the movable clamp 33 and keep them in a clamped state.

[0068] In the specific implementation process, the fixed clamp 31 is directly facing the pipe groove 15, the gas pipe 22 passes through the groove and moves to the end of the pipe groove 15, the fixed clamp 31 can contact the gas pipe 22, then the two screws 35 of the movable clamp 33 pass through the two through holes of the fixed clamp 31, and then the nut 36 is screwed into the screws 35. Finally, the fixed clamp 31 and the movable clamp 33 can clamp the gas pipe 22 to fix the position of the sealing device 11.

[0069] Furthermore, the ground gas pipeline facility leakage flow detection system also includes an end cap 41, which can cover and block the open surface; an extension mounting seat 42 is provided on the end cap 41, and the position of the extension mounting seat 42 corresponds to the position of the fixing clamp 31.

[0070] The extension mounting base 42 is provided with an arc-shaped groove 34 and screws 35 on both sides of the arc-shaped groove 34. The screws 35 of the extension mounting base 42 can pass through the through hole of the fixing clamp 31. The nut 36 can be screwed into the screw 35 to achieve the engagement of the end cap 41 with the sealing device 11 and to fix the sealing device 11 on the gas pipeline 22.

[0071] In this embodiment, as Figure 5 , Figure 6 As shown, when the gas pipeline 22 on the ground is not installed against a wall, the open surface can be closed by the end cap 41. The outer contour of the end cap 41 matches the outer contour of the open surface. The extension mounting base 42 is used to adjust the position of the screw 35 so that it matches the through hole on the fixing clamp 31. The screw 35 of the extension mounting base 42 can pass through the through hole of the fixing clamp 31. By screwing the nut 36 into the screw 35, the end cap 41 can be fastened to the sealing device 11 and the sealing device 11 can be fixed to the gas pipeline 22. The position of the sealing device 11 can be fixed during testing.

[0072] Furthermore, a collection device 51 is provided in the semi-enclosed space. The collection device 51 has a semi-enclosed structure and can partially enclose the gas pipe 22 that passes through the slot. The collection device 51 is hollow inside and has multiple air inlets 52 near the gas pipe 22.

[0073] A connecting pipe 53 is provided between the collection device 51 and the gas collection port 21 at the end inside the enclosed space; the gas hose 16 can be connected to the end outside the enclosed space of the gas collection port 21, and the gas hose 16 can collect gas near the gas pipeline 22 through the connecting pipe 53 and the collection device 51.

[0074] In this embodiment, for uneven walls 17, such as walls 17 with uneven decorations or uneven walls at the location of the gas pipeline 22 to be detected, the gap between the sealing device 11 and the outside is large, which can easily cause interference and result in inaccurate gas concentration information. In the above situations, such as... Figure 7 , Figure 8 As shown, the collection device 51 can partially surround the gas pipeline 22 inside the enclosed device 11. The collection device 51 is provided with an air inlet 52, which is located on the collection device 51 near the gas pipeline 22. The collection device 51 is hollow inside, and the collection device 51 is connected to the collection port through a connecting pipe 53.

[0075] In the specific implementation process, the collection device 51 can be a detachable component, which is placed inside the closed device 11 when needed. The connecting pipe 53 and the gas sampling port 21 are connected by plug-in connection at the end inside the closed space. When the collection device 51 is installed, the connecting pipe 53 is plugged into the end inside the closed space of the gas sampling port 21. When the collection device 51 is not used, the gas sampling port 21 is connected to the inside of the closed space.

[0076] Furthermore, the collection device 51 is a semi-circular pipe with the opening of the semi-circular pipe facing the pipe groove 15. The air inlet 52 is set on the inner wall of the semi-circular pipe, and the plurality of air inlets 52 are arranged along the axis of the semi-circular pipe.

[0077] In this embodiment, the acquisition device 51 is a semi-circular ring with a hollow interior. The axis of the semi-circular ring is parallel or collinear with the center line of the semi-circular end of the pipe groove 15. The opening of the semi-circular pipe faces the pipe groove 15. The air inlet 52 is set on the inner wall of the semi-circular pipe. Multiple air inlets 52 are set in the direction of the axis of the semi-circular pipe.

[0078] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A leakage flow detection system for ground-based gas pipeline facilities, used to capture and analyze gas within a confined space on the ground, and calculate methane leakage flow based on the gas sampling flow rate and measured concentration data, characterized in that: The ground gas pipeline facility leakage flow detection system includes a sealing device (11) for wrapping the gas pipeline, a gas flow meter (12) for measuring the gas flow rate, a pump (13) for extracting gas from inside the sealing device (11), and a gas analyzer (14) for detecting the concentration of methane and / or ethane. The sealing device (11) is a hollow shell with one side open. The other sides of the sealing device (11) form a semi-enclosed space. The open side is connected to the semi-enclosed space. The two sides adjacent to the open side are provided with pipe grooves (15). The pipe grooves (15) penetrate the side of the sealing device (11). The gas pipeline can pass through the pipe grooves (15) and pass through the semi-enclosed space. Gas hoses (16) are provided between the sealing device (11) and the gas flow meter (12), between the gas flow meter (12) and the vacuum pump (13), and between the vacuum pump (13) and the gas analyzer (14). The gas hoses (16) are used for gas transportation.

2. The leakage flow detection system for ground gas pipeline facilities according to claim 1, characterized in that: The sealing device (11) is a cube with a trapezoidal cross-section. The tube groove (15) is provided on the upper and lower bottom surfaces of the sealing device (11). The rear side of the sealing device (11) is an open surface. The upper or lower surface of the sealing device (11) is provided with a gas sampling port (21), which can be connected to a gas hose (16). The gas hose (16) can be connected to the gas sampling port (21) and extract gas from the semi-enclosed space.

3. A leakage flow detection system for ground gas pipeline facilities according to claim 1 or 2, characterized in that: The pipe groove (15) is long and narrow, with its length direction perpendicular to the open surface. The end of the pipe groove (15) away from the open surface is semi-circular, and the diameter of the semi-circular part is not less than the diameter of the gas pipeline.

4. A leakage flow detection system for ground gas pipeline facilities according to claim 1 or 2, characterized in that: The gas analyzer (14) is a portable infrared absorption spectroscopy technology methane and / or ethane analyzer, which can achieve high-precision detection of the concentration of methane and / or ethane in the gas.

5. The leakage flow detection system for ground gas pipeline facilities according to claim 1, characterized in that: The ground gas pipeline facility leakage flow detection system also includes a position fixing component, which includes a fixed clamp (31) and a movable clamp (33) as well as fasteners connecting the fixed clamp (31) and the movable clamp (33); The fixed clamp (31) is located on the upper or lower bottom surface near the end of the pipe groove (15) away from the open surface; the fixed clamp (31) and the movable clamp (33) are provided with arc-shaped grooves (34), and the arc-shaped groove (34) on the fixed clamp (31) is directly opposite the end of the groove; The movable clamp (33) and the fixed clamp (31) can clamp the gas pipeline with fasteners to fix the position of the sealing device (11).

6. The leakage flow detection system for ground gas pipeline facilities according to claim 5, characterized in that: The fastener includes a screw (35) on both sides of the arc-shaped groove (34) of the movable clamp (33) and a nut (36) that matches the screw (35); the fixed clamp (31) is provided with two through holes, the positions of which match the screw (35); The screw (35) on the movable clamp (33) can pass through the through hole on the fixed clamp (31), and then the fixed clamp (31) and the movable clamp (33) are clamped by the nut (36) to fix the position of the sealing device (11).

7. A leakage flow detection system for ground gas pipeline facilities according to claim 6, characterized in that: The ground gas pipeline facility leakage flow detection system also includes an end cap (41), which can cover and block the open surface; an extension mounting seat (42) is provided on the end cap (41), and the position of the extension mounting seat (42) corresponds to the position of the fixing clamp (31); The extension mounting base (42) is provided with an arc-shaped groove (34) and screws (35) on both sides of the arc-shaped groove (34). The screws (35) of the extension mounting base (42) can pass through the through hole of the fixing clamp (31). By screwing a nut (36) into the screw (35), the end cap (41) and the sealing device (11) can be fastened together and the sealing device (11) can be fixed on the gas pipeline.

8. A leakage flow detection system for ground gas pipeline facilities according to claim 2, characterized in that: The semi-enclosed space is equipped with a collection device (51), which is a semi-enclosed structure that can partially enclose the gas pipe passing through the slot; the collection device (51) is hollow inside, and multiple air inlets (52) are provided near the gas pipe. A connecting pipe (53) is provided between the end of the collection device (51) and the gas collection port (21) inside the enclosed space; the gas hose (16) can be connected to the end of the gas collection port (21) outside the enclosed space, and the gas hose (16) can collect gas near the gas pipeline through the connecting pipe (53) and the collection device (51).

9. A leakage flow detection system for ground gas pipeline facilities according to claim 8, characterized in that: The collection device (51) is a semi-circular pipe with the opening facing the groove (15). The air inlet (52) is located on the inner wall of the semi-circular pipe, and the multiple air inlets (52) are arranged along the axis of the semi-circular pipe.

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