A flow field tracer particle filling device and filling method in a natural gas pipeline

Abstract

To address the technical problem in existing techniques where tracer particles, when used to measure gas flow velocity and flow field changes in a natural gas pipeline, interfere with the stability of the natural gas flow field within the pipeline, resulting in decreased accuracy or even measurement failure, an embodiment of the present invention provides a natural gas pipeline flow field tracer particle injection device and injection method, comprising: a injection unit, the ends of which are connected to an upstream natural gas pipeline and a downstream natural gas pipeline, respectively; a plurality of tube bundles disposed within the injection unit for connecting the upstream and downstream natural gas pipelines; and a tracer particle generator for communicating with each tube bundle to simultaneously inject tracer particles into each of the tube bundles. This embodiment of the present invention reduces the range of disturbances in the downstream flow field caused by tracer injection, allowing the entire flow field to quickly stabilize, resulting in a more uniform concentration distribution of tracer particles in the pipeline and more accurate measurement results.

Description

Technical Field

[0001] The invention relates to a flow field tracer particle filling device and filling method in a natural gas pipeline. Background Art

[0002] When using lasers to measure gas flow velocity and flow field changes in natural gas pipelines, tracer particles must be added to the pipeline. The tracer particles follow the gas flow in the pipeline, and their position coordinates are captured and recorded by a high-speed camera. Using a corresponding algorithm, the particle velocity is then calculated, allowing the flow state and velocity of the gas in the pipeline to be deduced. Existing particle injection devices only have a single injection function. They are connected to the main natural gas pipeline via a high-pressure pipeline, and then the tracer particles are injected into the main pipeline wall or internal pipes. However, in practical applications, a significant problem exists: the addition of tracer particles significantly disrupts the stable flow field of the natural gas within the pipeline. This leads to two consequences: 1. Optical flow velocity measurements cannot be performed in sites with short straight pipe sections. This is because the disturbance of the downstream flow field after tracer injection often reaches 15 to 25 pipe diameters or more. If the straight pipe section upstream of the test section is less than 25 pipe diameters, the test section is within the disturbance range, resulting in flow velocity measurement failure. 2. This affects the accuracy of flow velocity measurements within the natural gas pipeline. The application of lasers to measure natural gas flow velocity requires a stable flow field. Interference from tracer particles in the flow field can increase errors in experimental data and reduce accuracy. Therefore, a novel device for injecting tracer particles into natural gas pipelines has been designed. This device can simultaneously rectify and stabilize the natural gas flow field during the injection process, which is of great significance for improving the technical level of optical methods for measuring flow fields within natural gas pipelines. Summary of the Invention

[0003] In order to solve the technical problem in the existing technology that when using tracer particles to measure the gas flow velocity and flow field changes in the natural gas pipeline, the stability of the natural gas flow field in the pipeline is disturbed, resulting in a decrease in the accuracy of the flow velocity measurement in the natural gas pipeline or measurement failure, an embodiment of the present invention provides a flow field tracer particle filling device and filling method in the natural gas pipeline.

[0004] The embodiments of the present invention are implemented through the following technical solutions:

[0005] In a first aspect, an embodiment of the present invention provides a device for injecting flow field tracer particles into a natural gas pipeline, comprising:

[0006] A filling unit, with both ends of the filling unit connected to an upstream natural gas pipeline and a downstream natural gas pipeline respectively;

[0007] a plurality of pipe bundles disposed in the filling unit and configured to connect an upstream natural gas pipeline with a downstream natural gas pipeline; and

[0008] The tracer particle generating device is used to communicate with each tube bundle to simultaneously inject tracer particles into each tube bundle.

[0009] Furthermore, each tube bundle is connected to the tracer particle generating device through a filling pipeline; the filling pipeline is provided with a valve and a pressure sensor for monitoring the gas pressure in the filling pipeline.

[0010] Furthermore, the tracer particle generating device includes:

[0011] a pressure vessel for storing the tracer and pressurized gas for transporting the tracer particles;

[0012] a tracer adding port, provided on the pressure vessel, for adding the tracer into the pressure vessel; and

[0013] The air inlet is provided in the pressure vessel and is used to input pressurized gas into the pressure vessel so that the pressure vessel generates air pressure to transport the tracer particles into the tube bundle.

[0014] Furthermore, the tracer particle generating device is also connected to a diverter; the diverter is connected to the corresponding tube bundle through each filling pipeline.

[0015] Furthermore, the filling unit is configured as a standard natural gas rectifier; seven tube bundles are evenly distributed in the standard natural gas rectifier; and each tube bundle is arranged in parallel along the length direction of the filling unit.

[0016] Furthermore, six tube bundles are distributed around the standard natural gas rectifier, one tube bundle is set at the center of the standard natural gas rectifier, and each tube bundle distributed around the standard natural gas rectifier is connected to the filling pipeline through a tracer particle filling nozzle.

[0017] Furthermore, the pressure vessel is a stainless steel kettle.

[0018] In a second aspect, an embodiment of the present invention provides a filling method for the filling device, comprising: monitoring the gas pressure in each filling pipeline connected to each tube bundle and the gas pressure in the natural gas pipeline;

[0019] If the difference between the gas pressure in each filling line and the gas pressure in the natural gas pipeline is a positive pressure difference and the positive pressure difference remains stable, the valves at each corresponding position are controlled to allow the tracer particles to be atomized and enter the tube bundle.

[0020] Furthermore, the positive pressure difference is 0.5 MPa to 1.0 MPa; and the particle size of the tracer particles after atomization is 0.1 μm to 5 μm.

[0021] Furthermore, if the difference between the gas pressure in each filling pipeline and the gas pressure in the natural gas pipeline is a positive pressure difference and the positive pressure difference remains stable, the valves at each corresponding position are controlled to allow the tracer particles to be atomized and enter the tube bundle; it also includes: if the difference between the gas pressure in each filling pipeline and the gas pressure in the natural gas pipeline is a positive pressure difference and the positive pressure difference remains stable, the opening of the valves at each corresponding position is controlled to adjust the tracer particle filling rate entering the tube bundle in real time to achieve control of the tracer particle concentration in the downstream natural gas pipeline.

[0022] Compared with the prior art, the embodiments of the present invention have the following advantages and beneficial effects:

[0023] A natural gas pipeline flow field tracer particle filling device and filling method according to an embodiment of the present invention is connected between an upstream natural gas pipeline and a downstream natural gas pipeline through a filling unit. Tracer particles are injected into multiple tube bundles in the filling unit through a tracer particle generating device. The flow field in the natural gas pipeline can be rectified and stabilized while the tracer particles are added, which significantly reduces the scope of disturbance influence on the downstream flow field caused by the addition of tracers, so that the entire flow field can quickly stabilize. This is not only beneficial for optical velocity measurement in various natural gas stations where the straight pipe section length is less than 30 times the pipe diameter due to complex field conditions, but also improves the stability of the natural gas flow field, which is more conducive to accurate measurement of flow velocity.

[0024] The embodiment of the present invention improves the traditional single-point injection into multi-point rectifier injection. The new injection method makes the concentration distribution of tracer particles in the pipeline more uniform and the measurement results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without making any creative efforts.

[0026] Figure 1 This is a side structural diagram of the flow field tracer particle filling device in the natural gas pipeline.

[0027] Figure 2 This is a schematic diagram of the front structure of the flow field tracer particle filling device in the natural gas pipeline.

[0028] Figure 3 This is a flow chart of the method for injecting tracer particles into the flow field in a natural gas pipeline.

[0029] Figure 4 Schematic diagram of the flow field tracer particle injection system in natural gas pipelines.

[0030] Markings and corresponding parts names in the accompanying drawings:

[0031] 1-particle generator, 11-tracer addition port, 12-air inlet, 13-stainless steel kettle, 14-air outlet, 2-particle filling unit, 21-flow splitter, 22-standard natural gas rectifier, 23-filling pipeline, 24-stop valve, 25-pressure sensor, 26-particle filling nozzle, 27-connecting flange, 31-upstream natural gas pipeline, 32-downstream natural gas pipeline. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0033] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0034] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combinations and / or subcombinations. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0036] Example

[0037] In order to solve the technical problem in the existing technology that when using tracer particles to measure the gas flow velocity and flow field changes in the natural gas pipeline, the stability of the natural gas flow field in the pipeline is disturbed, resulting in a decrease in the accuracy of the flow velocity measurement in the natural gas pipeline or measurement failure, an embodiment of the present invention provides a flow field tracer particle filling device and filling method in the natural gas pipeline.

[0038] In the first aspect, the embodiment of the present invention provides a flow field tracer particle filling device in a natural gas pipeline, referring to Figure 1 and 2 As shown, it includes: a filling unit 2, the two ends of which are respectively connected to the upstream natural gas pipeline 31 and the downstream natural gas pipeline 32; a plurality of tube bundles, arranged in the filling unit, for connecting the upstream natural gas pipeline and the downstream natural gas pipeline; and a tracer particle generating device 1, for connecting with each tube bundle to simultaneously inject tracer particles into each of the tube bundles.

[0039] Therefore, the embodiment of the present invention improves the traditional single-point filling into multi-point rectifier filling. The new filling method makes the concentration distribution of tracer particles in the pipeline more uniform and the measurement results more accurate; it avoids the defect of the existing technology of using tracer particles to measure the gas flow rate and flow field changes in the natural gas pipeline, which interferes with the stability of the natural gas flow field in the pipeline, resulting in a decrease in the accuracy of the flow rate measurement in the natural gas pipeline or measurement failure.

[0040] refer to Figure 1 and 2 As shown, a flow field tracer particle filling device in a natural gas pipeline includes: a tracer particle generating device 1 and a filling unit 2; the tracer particle generating device 1 is connected to the filling unit 2.

[0041] The tracer particle generating device comprises: a pressure vessel for storing a tracer and a pressurized gas for conveying tracer particles; a tracer adding port provided in the pressure vessel for adding the tracer to the pressure vessel; and

[0042] The air inlet is provided in the pressure vessel and is used to input pressurized gas into the pressure vessel so that the pressure vessel generates air pressure to transport the tracer particles into the tube bundle.

[0043] The tracer is used to gasify in the pressure vessel to produce tracer particles. By adjusting the amount of pressurized gas entering the pressure vessel, the pressure of the pressure vessel can be adjusted, and then the injection rate of the tracer particles into the tube bundle can be adjusted.

[0044] The tracer particle generating device 1 includes a tracer addition port 11, an air inlet 12, a pressure vessel 13 and an air outlet 14; the tracer addition port 11 is connected to the stainless steel kettle body 13, the air inlet 12 is connected to the stainless steel kettle body 13, and the air outlet 14 is connected to the stainless steel kettle body 13; the filling unit 2 includes a standard natural gas rectifier 22, a filling pipeline 23, a stop valve 24, a pressure sensor 25 and a connecting flange 27; the diverter 21 is connected to the air outlet 14, and the two ends of the standard natural gas rectifier 22 are respectively connected to the upstream natural gas pipeline and the downstream natural gas pipeline through the connecting flange 27, the stop valve 24 and the pressure sensor 25 are installed on the filling pipeline 23, and the filling pipeline 23 is connected to the standard natural gas rectifier 22.

[0045] Optionally, the pressure vessel is a stainless steel kettle; further, the pressure vessel is a stainless steel kettle.

[0046] Therefore, through the above arrangement, the tracer particles in the pressure vessel can be stably injected into the pipe bundle through the stop valve under the monitoring of the pressure sensor, avoiding interference with the stability of the natural gas flow field in the natural gas pipeline.

[0047] Each filling unit 2 is equipped with multiple tube bundles, arranged parallel to each other along the length of the filling unit. Each tube bundle is connected to the tracer particle generator 1 via a filling pipeline 23. The filling pipeline 23 is equipped with a valve and a pressure sensor 25 for monitoring the gas pressure within the filling pipeline. Optionally, the valve is a shutoff valve 24. Optionally, the filling pipeline is equipped with a shutoff valve 24 and a pressure sensor 25 connected in sequence.

[0048] By setting up multiple tube bundles and injecting tracer particles into the multiple tube bundles at the same time, the interference of local single-point injection on the natural gas flow field in the natural gas pipeline is avoided.

[0049] In order to allow the tracer particles in the tracer particle generating device to enter different tube bundles, the tracer particle generating device is further connected to a diverter 21 ; the diverter 21 is connected to the corresponding tube bundle through each filling pipeline 23 .

[0050] refer to Figure 2 As shown, the tracer particles in the pressure vessel 13 are split by the splitter and enter different filling pipelines; each filling pipeline is connected to a different tube bundle, so that the tracer particles in the pressure vessel 13 can enter different tube bundles through the splitter.

[0051] Furthermore, the filling unit is configured as a standard natural gas rectifier; seven tube bundles are evenly distributed in the standard natural gas rectifier; and each tube bundle is arranged in parallel along the length direction of the filling unit.

[0052] refer to Figure 2 As shown, the tracer particle generating device 1 includes a tracer addition port 11, an air inlet 12, a pressure vessel 13 and an air outlet 14; the filling unit is a standard natural gas rectifier 22; 7 tube bundles are distributed in the standard natural gas rectifier, and the 7 tube bundles are arranged in parallel along the length direction of the filling unit; among them, 6 tube bundles are distributed on the circumference of the standard natural gas rectifier, and 1 tube bundle is arranged at the center of the standard natural gas rectifier. Each tube bundle distributed on the circumference of the standard natural gas rectifier is connected to the filling pipeline through a tracer particle filling nozzle 26.

[0053] refer to Figure 2 As shown, six tube bundles are distributed near the circumferential edge of the standard natural gas rectifier; one tube bundle is set at the center of the standard natural gas rectifier; the six tube bundles distributed near the circumferential edge of the standard natural gas rectifier are connected to the diverter 21 after passing through the stop valve 24 and pressure sensor 25 on their respective filling pipelines in sequence.

[0054] Furthermore, gas at a specified pressure is charged into the stainless steel kettle body 13 through the air inlet 12 to increase the internal pressure of the kettle body to the working pressure.

[0055] Furthermore, the maximum pressure bearing capacity of the stainless steel kettle body 13 is 10 MPa.

[0056] Furthermore, the pressure sensor 25 is used to monitor the internal pressure of the filling pipeline in real time with an accuracy of ±0.1 MPa.

[0057] Furthermore, the gas splitter 21 is connected to the gas outlet 14 pipeline upstream and to each filling pipeline 23 downstream.

[0058] Furthermore, the interior of the standard natural gas rectifier 22 is designed as a standard natural gas rectifier (7-tube bundle), and is connected to the upstream natural gas pipeline 31 and the downstream natural gas pipeline 32 using connecting flanges 27 .

[0059] Furthermore, six particle injection nozzles 26 are designed on the outer wall surfaces of the six tube bundles close to the outside of the standard natural gas rectifier 22 , and each particle injection nozzle 26 is matched with a set of pressure sensors 25 and stop valves 24 through injection pipelines.

[0060] Furthermore, a particle filling nozzle 26 is connected to the filling pipeline 23 .

[0061] refer to Figure 2 As shown, each tube bundle is atomized with tracer particles from the filling line through a particle filling nozzle and then added into the tube bundle.

[0062] Furthermore, the pressure sensor 25 is designed outside the stop valve 24 .

[0063] Therefore, the embodiment of the invention is connected between the upstream natural gas pipeline and the downstream natural gas pipeline through the filling unit, and the tracer particles are injected into the multiple tube bundles in the filling unit through the tracer particle generating device. The flow field in the natural gas pipeline can be rectified and stabilized while the tracer particles are added, which significantly reduces the scope of the disturbance influence on the downstream flow field due to the addition of tracers, so that the entire flow field can quickly tend to stabilize. It is not only beneficial for various natural gas stations with complex field conditions and straight pipe section lengths less than 30 times the pipe diameter to realize optical velocity measurement, but also improves the stability of the natural gas flow field, which is more conducive to accurate measurement of flow velocity.

[0064] The embodiment of the present invention improves the traditional single-point injection into multi-point rectifier injection. The new injection method makes the concentration distribution of tracer particles in the pipeline more uniform and the measurement results more accurate.

[0065] In a second aspect, an embodiment of the present invention provides a filling method of the filling device, referring to Figure 3 Shown, including:

[0066] S1. Monitor the gas pressure in each filling line connected to each tube bundle and the gas pressure in the natural gas pipeline;

[0067] S2. If the difference between the gas pressure in each filling pipeline and the gas pressure in the natural gas pipeline is a positive pressure difference and the positive pressure difference remains stable, control the valves at each corresponding position to allow the tracer particles to be atomized and enter the tube bundle.

[0068] Furthermore, the positive pressure difference is 0.5 MPa to 1.0 MPa; and the particle size of the tracer particles after atomization is 0.1 μm to 5 μm.

[0069] Furthermore, if the difference between the gas pressure in each filling pipeline and the gas pressure in the natural gas pipeline is a positive pressure difference and the positive pressure difference remains stable, the valves at each corresponding position are controlled to allow the tracer particles to be atomized and enter the tube bundle; it also includes: if the difference between the gas pressure in each filling pipeline and the gas pressure in the natural gas pipeline is a positive pressure difference and the positive pressure difference remains stable, the opening of the valves at each corresponding position is controlled to adjust the tracer particle filling rate entering the tube bundle in real time to achieve control of the tracer particle concentration in the downstream natural gas pipeline.

[0070] Specifically, refer to Figure 3 As shown, an embodiment of the present invention provides a method for injecting tracer particles for natural gas internal flow field testing, comprising:

[0071] a. Add the tracer into the stainless steel kettle 13 through the tracer addition port 11. After the addition is completed, close the tracer particle addition port 11, open the air inlet 12, and inject the specified gas into the stainless steel kettle 13. By controlling the gas injection rate of the air inlet 12, the internal pressure of the stainless steel kettle 13 is controlled.

[0072] b. The tracer gas passes through the natural gas splitter 21 and reaches the standard natural gas rectifier 22. The pressure value of each filling point is monitored in real time by the pressure sensor 25, so that a positive pressure difference is generated between the pressure and the pressure in the natural gas pipeline and the pressure remains stable.

[0073] c. After the pressure stabilizes, the corresponding stop valve 24 is opened according to the designed experimental plan, and the tracer is atomized through multiple particle injection nozzles 26 to form tracer particles and injected into the natural gas pipeline.

[0074] Optionally, the positive pressure difference is 0.5 MPa to 1.0 MPa.

[0075] Optionally, the tracer particles formed after atomization have a particle size of 0.1 μm to 5 μm.

[0076] Optionally, the internal pressure of the mixing chamber 13 is controlled by controlling the gas injection speed of the gas inlet 12 .

[0077] Optionally, the tracer particle injection rate can be adjusted in real time by controlling the opening of the stop valve 24, so as to facilitate control of the tracer particle concentration in the downstream pipeline.

[0078] The embodiment of the present invention also provides a tracer particle injection system for natural gas internal flow field testing, referring to Figure 4 Shown, including:

[0079] A pressure monitoring unit, used to monitor the gas pressure in each filling line connected to each pipe bundle and the gas pressure in the natural gas pipeline;

[0080] The control unit is used to control the valves at the corresponding positions to allow the tracer particles to be atomized and enter the tube bundle if the difference between the gas pressure in each filling pipeline and the gas pressure in the natural gas pipeline is a positive pressure difference and the positive pressure difference remains stable.

[0081] The principle is the same as the above method and will not be repeated here.

[0082] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flow field tracer particle filling device in a natural gas pipeline, characterized in that: include: A filling unit, with both ends of the filling unit connected to an upstream natural gas pipeline and a downstream natural gas pipeline respectively; A plurality of pipe bundles are provided in the filling unit and are used to connect an upstream natural gas pipeline and a downstream natural gas pipeline; as well as a tracer particle generator, configured to communicate with each tube bundle to simultaneously inject tracer particles into each tube bundle, the tracer particle generator comprising a pressure vessel, a tracer addition port, and an air inlet; the pressure vessel being configured to store a tracer and pressurized gas for conveying the tracer particles; the tracer addition port being provided in the pressure vessel for adding the tracer to the pressure vessel; and the air inlet being provided in the pressure vessel for inputting pressurized gas into the pressure vessel to generate air pressure in the pressure vessel for conveying the tracer particles into the tube bundle; Each tube bundle is connected to the tracer particle generator through a filling pipeline; the filling pipeline is provided with a valve and a pressure sensor for monitoring the gas pressure in the filling pipeline; Filling methods, including: a. In the generator, a tracer is added to the pressure vessel through the tracer addition port. After the addition is completed, the tracer particle addition port is closed, the air inlet is opened, and a specified gas is injected into the pressure vessel. The internal pressure of the generator pressure vessel is controlled by controlling the gas injection rate of the air inlet; b. In the filling unit, the tracer gas passes through the natural gas splitter and reaches the standard natural gas rectifier. The pressure at each filling point is monitored in real time by a pressure sensor, creating a positive pressure differential with the pressure in the natural gas pipeline and maintaining a stable pressure. c. After the pressure stabilizes, open the corresponding shut-off valve according to the designed experimental plan. The tracer is atomized through multiple particle injection nozzles to form tracer particles and injected into the natural gas pipeline.

2. The flow field tracer particle filling device in a natural gas pipeline according to claim 1, characterized in that: The tracer particle generating device is further connected to a diverter; the diverter is connected to the corresponding tube bundle through each filling pipeline.

3. The flow field tracer particle filling device in a natural gas pipeline according to claim 1, characterized in that: The filling unit is configured as a standard natural gas rectifier; seven tube bundles are evenly distributed in the standard natural gas rectifier; each tube bundle is arranged in parallel along the length direction of the filling unit.

4. The flow field tracer particle filling device in a natural gas pipeline according to claim 3, characterized in that: Six tube bundles are distributed around the standard natural gas rectifier, one tube bundle is arranged at the center of the standard natural gas rectifier, and each tube bundle distributed around the standard natural gas rectifier is connected to a filling pipeline through a tracer particle filling nozzle.

5. The flow field tracer particle filling device in a natural gas pipeline according to claim 1, characterized in that: The pressure vessel is a stainless steel kettle.

6. A filling method using the filling device according to any one of claims 2 to 5, characterized in that: The positive pressure difference is 0.5MPa~1.0MPa; the particle size of the tracer particles after atomization is 0.1μm~5μm.

7. The filling method according to claim 6, wherein: If the difference between the gas pressure in each filling pipeline and the gas pressure in the natural gas pipeline is a positive pressure difference and the positive pressure difference remains stable, the valves at each corresponding position are controlled to allow the tracer particles to be atomized and enter the tube bundle; it also includes: if the difference between the gas pressure in each filling pipeline and the gas pressure in the natural gas pipeline is a positive pressure difference and the positive pressure difference remains stable, the opening of the valves at each corresponding position is controlled to adjust the injection rate of the tracer particles entering the tube bundle in real time to achieve control of the tracer particle concentration in the downstream natural gas pipeline.

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