A simulated experimental device for buried gas pipeline leakage
By introducing a gas pretreatment structure and a pressure field microphone into the buried gas pipeline leakage simulation experimental device, the problem of poor accuracy of existing testing devices has been solved, enabling more accurate simulation testing, guiding the installation density of sensors in gas pipelines, and improving the accuracy of detecting gas leak points.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 叶苗苗
- Filing Date
- 2025-09-16
- Publication Date
- 2026-07-03
AI Technical Summary
Existing buried gas pipeline leakage simulation testing devices suffer from poor accuracy and are susceptible to interference from factors such as gas purity and pressure, resulting in unsatisfactory simulation test data in practical applications.
A buried gas pipeline leakage simulation experimental device was designed, including a test chamber, a simulation test system, sensors and a gas pretreatment structure. The gas is purified by means of oil-water separation, cold drying treatment and pressure regulation. Combined with a pressure field microphone to capture leakage noise, the device simulates the actual operating environment of a gas pipeline.
It improves the accuracy of simulation testing, effectively reduces interference from water noise and impurities in the gas, ensures the stability of test gas pressure and flow, guides the installation density of sensors in actual gas pipelines, and improves the accuracy of detecting gas leaks.
Smart Images
Figure CN224456106U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of buried gas pipeline leakage simulation testing technology, and in particular relates to a buried gas pipeline leakage simulation experimental device. Background Technology
[0002] Urban underground gas pipeline networks are a crucial component of urban lifeline engineering, and their safe operation is paramount. Damage caused by third-party construction, pipeline aging, corrosion, and other factors can all lead to gas pipeline leaks, causing serious safety accidents. Therefore, studying the mechanisms of pipeline leaks and developing advanced leak detection and location technologies are of great significance. Experimental simulation is a key means of studying leak characteristics and verifying detection methods. By simulating the sound source characteristics of underground pipeline leaks in the laboratory, accurate testing methods can be obtained to provide theoretical guidance for the actual monitoring of gas pipelines.
[0003] Specifically, due to the complexity of underground gas pipelines, it is difficult to locate the leak in the shortest possible time once a gas leak occurs. Since gas leaks can easily lead to explosions, locating the leak and taking immediate emergency measures is a crucial measure to ensure the safety of gas pipelines.
[0004] Sensors are a highly effective monitoring tool, but in practical applications, the optimal sensor density and the appropriate sensor type for accurate and immediate gas leak detection are often unclear. Therefore, laboratory simulations are necessary to determine the optimal sensor placement for critical monitoring components.
[0005] However, the accuracy of current testing equipment is very poor. For example, it is affected by many factors such as gas purity (e.g., high water content in the gas causes significant noise interference) and gas pressure. The simulated test data obtained is not ideal for application in actual processes. Utility Model Content
[0006] Based on the above background, the purpose of this utility model is to provide a simulation experimental device for buried gas pipeline leakage.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A buried gas pipeline leakage simulation test device includes a test chamber and a simulation test system;
[0009] The simulation test system includes a test pipe that runs through the test chamber, and the test chamber is filled with a buried medium for embedding the test pipe; the buried section of the test pipe is equipped with a venting structure.
[0010] It also includes several sensors installed in the buried medium to capture leakage data;
[0011] It also includes a gas pretreatment structure installed on the test pipeline for pretreating the test gas, which purifies and regulates the pressure of the test gas.
[0012] Preferably, the test chamber has an observation port, and an observation plate made of transparent material is fixedly installed on the observation port.
[0013] Preferably, the burial medium is soil filled inside the test chamber;
[0014] The test pipeline is buried in the soil at a depth of 0.5-1.5m and has a length of 2m.
[0015] Preferably, four sensors are installed in the buried medium, and the sensors are pressure field microphones;
[0016] The four pressure field microphones are positioned in order from closest to the vent structure to furthest from the vent structure, with distances from the vent structure of 0.5m, 0.75m, 1m, and 1.25m respectively.
[0017] Preferably, the venting structure includes an exhaust valve installed on the test pipeline, and the exhaust valve is an electric ball valve.
[0018] Preferably, the gas pretreatment structure includes an oil-water separation and purification structure, a cold drying structure, a pressure tank structure, and a pressure regulating structure installed on the test pipeline.
[0019] Preferably, the oil-water separation and purification structure includes a first oil-water separator installed at the air inlet end of the test pipeline, and the cold drying structure includes a cold dryer connected to the air outlet end of the first oil-water separator.
[0020] The pressure tank structure includes a pressure tank connected to the outlet of the refrigerated dryer; the oil-water separation and purification structure also includes a second oil-water separator connected to the outlet of the refrigerated dryer; and a water-oil filter connected to the outlet of the pressure tank.
[0021] The pressure regulating structure includes a pressure reducing valve connected to the air outlet of the water-oil filter.
[0022] Preferably, the outlet of the pressure reducing valve is connected to a high-pressure hose, the outlet of the high-pressure hose is connected to a pressure gauge, the outlet of the pressure gauge is connected to a flow valve, and the flow valve is connected to the buried section of the test pipeline.
[0023] Preferably, the pressure regulating structure further includes a pressure relief valve installed at the outlet end of the test pipeline;
[0024] The pressure relief valve is located on the outside of the buried section.
[0025] Preferably, a sound-absorbing cotton board is fixedly connected to the inner wall of the test chamber.
[0026] This utility model has the following beneficial effects:
[0027] 1. The test gas is discharged from the buried section through an electric ball valve, and the leakage noise is captured by a sensor. Because the gas is purified by the first and second oil-water separators, interference from water noise in the test gas is effectively avoided. Simultaneously, the refrigerated dryer freeze-dries the moisture in the gas, further purifying and reducing water noise interference.
[0028] 2. The accuracy of the test is ensured by using a gas pressure regulating structure such as a pressure tank. The gas discharged from the pressure tank is further purified by a water-oil filter to reduce the interference of water impurities in the gas. Then the gas enters a pressure reducing valve to reduce the gas pressure, and enters the buried section in the test chamber at normal gas pressure (based on the actual gas pipeline delivery pressure) for testing. The pressure tank structure provides a stable pressure and flow rate of test gas for a long time during the testing process.
[0029] 3. The venting structure adopts an electric ball valve structure. During the test, the gas noise generated by the exhaust can be controlled by adjusting the valve exhaust volume. Attached Figure Description
[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model;
[0032] Figure 2 This is a schematic diagram of the test principle structure in an embodiment of this utility model;
[0033] Figure 3 This is a schematic diagram of the structure for opening detection holes in the soil in an embodiment of this utility model;
[0034] Figure 4 This is a schematic diagram showing the arrangement of the microphone and the venting structure in an embodiment of the present invention.
[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0037] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0038] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.
[0039] Example 1
[0040] like Figure 1-4 As shown, a buried gas pipeline leakage simulation experimental device includes a test chamber 1. The top of the test chamber 1 is an open structure for easy filling with the test medium (soil), while the remaining sides, including the bottom, are sealed with panels. To facilitate observation of the conditions inside the test chamber 1, an observation port 11 is provided on the test chamber 1, and a transparent observation plate is fixedly installed on the observation port 11. The observation plate can be made of tempered glass.
[0041] To enable more accurate simulation testing and obtain a more precise test structure, the above also includes a simulation testing system 2. The simulation testing system 2 includes a test pipe 21 that runs through the test chamber 1. The test chamber 1 is filled with a burial medium (such as soil) for burying the test pipe 21. The buried section 211 of the test pipe 21 is equipped with a venting structure. That is, the test pipe 21 is located in the pipe section buried in the soil within the test chamber 1.
[0042] Additionally, it includes several sensors installed within the buried medium to capture leakage data. Specifically, the sensors are pressure field microphones 4. Four pressure field microphones 4 are used, positioned sequentially from closest to the vent structure to furthest away, with distances from the vent structure of 0.5m, 0.75m, 1m, and 1.25m respectively.
[0043] Specifically, before the test, a detection hole 3 is made in the soil, and a pressure field microphone 4 is placed at the bottom of the detection hole 3. During the test, the venting structure 202 is opened (specifically, the venting structure 202 is an electric ball valve installed at the buried section 211 of the test pipeline 21, as disclosed in the prior art), and the leaking gas in the test pipeline 21 is detected. The sound generated by the leaking gas is captured by the pressure field microphone 4 and fed back to the background. By arranging the pressure field microphone 4 in the above order, the purpose is to obtain the optimal sensor placement density (based on the standard of accurately capturing gas leaks), thereby guiding the sensor installation density during the actual laying of gas pipelines.
[0044] The test pipe 21 is buried in the soil at a depth of 0.5-1.5m (simulating the actual burial depth of the pipe), and the length of the buried pipe is 2m.
[0045] Example 2
[0046] like Figure 1-4 As shown, based on the structure of Example 1, in order to further increase the accuracy of experimental simulation testing and avoid interference from test gas (fuel gas) in the test, this utility model designs a gas processing system to process the test gas, so as to purify the gas and regulate the gas pressure. After the gas is purified, such as separating the water in the gas, the water mixed in the gas is prevented from interfering with the test results during the test.
[0047] Specifically, it also includes a gas pretreatment structure installed on the test pipeline 21 for pretreating the test gas, through which the test gas is purified and its pressure is regulated.
[0048] Specifically, the gas pretreatment structure includes an oil-water separation and purification structure, a cold drying structure, a pressure tank structure, and a pressure regulating structure installed on the test pipeline 21.
[0049] The specific connection and installation sequence of the above structures on test pipeline 21 is as follows: the oil-water separation and purification structure includes a first oil-water separator 201 installed at the air inlet end of test pipeline 21; the refrigerated drying structure includes a refrigerated dryer 29 connected to the air outlet end of the first oil-water separator 201; the pressure tank structure includes a pressure tank 27 connected to the air outlet end of the refrigerated dryer 29; the oil-water separation and purification structure also includes a second oil-water separator 28 connected to the air outlet end of the refrigerated dryer 29. The air outlet end of pressure tank 27 is connected to a water-oil filter 26, which is connected to the pressure reducing valve 23 described below.
[0050] The pressure regulating structure includes a pressure reducing valve 23 connected to the outlet of the second oil-water separator 28.
[0051] In the above structure, natural gas is first introduced into the inlet of test pipeline 21. The natural gas first undergoes preliminary oil-water separation through the first oil-water separator 201. After the preliminary oil-water separation is completed, the gas is initially purified. Subsequently, the gas is refrigerated and dried by the refrigerated dryer 29, and then undergoes oil-water separation again. The gas then enters the pressure tank 27 for storage. When the gas volume reaches a certain level, the pressure tank 27 can supply test gas at a constant pressure during the test (ensuring that the pressure, flow rate, and flow rate of the test gas are constant), thus ensuring the accuracy of the test. The gas discharged from the pressure tank 27 is then further purified by the water-oil filter 26 to further reduce the interference of water impurities in the gas.
[0052] The gas then enters the pressure reducing valve 23 to reduce the gas pressure, and enters the buried section 211 in the test chamber 1 at the normal gas pressure (based on the actual gas pipeline delivery pressure) for testing.
[0053] Meanwhile, in order to monitor the gas pressure, a high-pressure hose 22 is connected to the outlet of the pressure reducing valve 23. A pressure gauge 24 is installed at the outlet of the high-pressure hose 22. A flow valve 25 (for monitoring the flow rate of the test gas) is installed at the outlet of the pressure gauge 24. The flow valve 25 is connected to the buried section 211211 of the test pipeline 21.
[0054] The test gas is discharged from the buried section 211 through an electric ball valve, and the leakage noise is captured by a sensor. Because the gas is purified by the first oil-water separator 201 and the second oil-water separator 28, interference from water noise in the test gas is effectively avoided. Simultaneously, the refrigerated dryer 29 freeze-dries the moisture in the gas, further purifying it and reducing water noise interference.
[0055] Furthermore, after the gas passes through pressure tank 27, pressure relief valve, and other structures to regulate its pressure, the gas in the testing process can more accurately simulate the normal gas transmission pressure, thereby further improving the accuracy of the test.
[0056] The aforementioned pressure regulating structure also includes a pressure relief valve 25 installed at the outlet end of the test pipeline 21. The pressure relief valve 25 is located on the outside of the buried section 211.
[0057] During the testing process, to further avoid interference from external environmental noise, sound-absorbing cotton panels (such as sound-absorbing foam) are fixedly connected to the inner side wall of the test chamber 1, following existing soundproofing methods. The sound-absorbing cotton panels can be fixed to each side wall of the test chamber 1 to prevent interference from external environmental noise.
[0058] Example 3
[0059] like Figure 1-4 As shown, based on the structure of Embodiment 2, this embodiment provides the following specific model numbers for each component in the testing system:
[0060]
[0061]
[0062] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.
Claims
1. A buried gas pipeline leakage simulation experiment device, characterized in that, Includes the test chamber and the simulation test system; The simulation test system includes a test pipe that runs through the test chamber, and the test chamber is filled with a buried medium for embedding the test pipe; the buried section of the test pipe is equipped with a venting structure. It also includes several sensors installed in the buried medium to capture leakage data; It also includes a gas pretreatment structure installed on the test pipeline for pretreating the test gas, which purifies and regulates the pressure of the test gas.
2. The buried gas pipeline leakage simulation experiment device according to claim 1, characterized in that, The test chamber has an observation port, and an observation plate made of transparent material is fixedly installed on the observation port.
3. The buried gas pipeline leakage simulation experiment device according to claim 1, characterized in that, The burial medium is soil filled inside the test chamber; The test pipeline is buried in the soil at a depth of 0.5-1.5m and a length of 2m.
4. The buried gas pipeline leakage simulation experiment device according to claim 1, characterized in that, Four sensors are installed in the buried medium; the sensors are pressure field microphones. The four pressure field microphones are positioned in order from closest to the vent structure to furthest from the vent structure, with distances from the vent structure of 0.5m, 0.75m, 1m, and 1.25m respectively.
5. The buried gas pipeline leakage simulation experiment device according to claim 1, characterized in that, The venting structure includes an exhaust valve installed on the test pipeline, which is an electric ball valve.
6. The buried gas pipeline leakage simulation experiment device according to claim 4, characterized in that, The gas pretreatment structure includes an oil-water separation and purification structure, a cold drying structure, a pressure tank structure, and a pressure regulating structure installed on the test pipeline.
7. The buried gas pipeline leakage simulation experiment device according to claim 6, characterized in that, The oil-water separation and purification structure includes a first oil-water separator installed at the air inlet end of the test pipeline, and the cold drying structure includes a cold dryer connected to the air outlet end of the first oil-water separator. The pressure tank structure includes a pressure tank connected to the outlet of the refrigerated dryer; the oil-water separation and purification structure also includes a second oil-water separator connected to the outlet of the refrigerated dryer; and a water-oil filter connected to the outlet of the pressure tank. The pressure regulating structure includes a pressure reducing valve connected to the air outlet of the water-oil filter.
8. The buried gas pipeline leakage simulation experiment device according to claim 7, characterized in that, The outlet of the pressure reducing valve is connected to a high-pressure hose, the outlet of the high-pressure hose is connected to a pressure gauge, and the outlet of the pressure gauge is connected to a flow valve, which is connected to the buried section of the test pipeline.
9. The buried gas pipeline leak simulation experiment device according to claim 8, characterized in that, The pressure regulating structure also includes a pressure relief valve installed at the outlet end of the test pipeline; The pressure relief valve is located on the outside of the buried section.
10. The buried gas pipeline leak simulation experiment apparatus according to claim 1, characterized in that, A sound-absorbing cotton board is fixedly connected to the inner wall of the test chamber.