Experimental device for studying leakage and diffusion of buried gas pipelines

Abstract

The present invention discloses an experimental device for studying the leakage and diffusion of buried gas pipelines, including a high-pressure fuel tank filled with fuel and a first pressure transmitter, a first flow meter, a soil box, a second pressure transmitter and a second flow meter sequentially installed on the transmission pipeline. The present invention installs an experimental tube with a leakage hole in the soil box through the soil box, and installs a sensor array in the soil box, and the sensor array is connected to a host computer through a wireless communication module. The experimental device controls the size of the fuel leakage through the leakage hole set on the experimental tube, detects the position affected by the fuel leakage through the sensor array, and then generates a leakage diffusion model corresponding to the sensor array on the host computer, which is beneficial to the study of buried pipeline leakage and has the characteristics of simple structure, convenient operation and low experimental research cost.

Description

Technical Field

[0001] The invention relates to an experimental research device, in particular to an experimental device for studying the leakage and diffusion of buried gas pipelines. Background Art

[0002] With the development of pipeline transportation technology and the continuous optimization and adjustment of energy structure in my country, natural gas, as a clean, efficient, sustainable and economical high-quality fuel, is used not only as a fuel for industrial production but also as a fuel for urban residents to cook, boil water and other daily life. And with the development of gas pipeline construction, the demand for gas in daily life of citizens is increasing year by year.

[0003] Urban gas pipelines are generally laid in the soil. Pipelines buried in the soil are very prone to soil corrosion, external mechanical impact, loose pipeline connections and other factors, leading to urban buried gas pipeline leakage accidents. Once a gas pipeline leaks, the gas containing components such as alkanes, methane, and ethane will seep into the soil, which will pollute the soil on the one hand, and waste fuel on the other hand, which will not only affect the normal operation of the fuel pipeline transportation but also cause economic losses. Therefore, for the leakage monitoring of buried gas pipelines, in addition to designing corresponding leakage detection tools and monitoring and alarm systems, it is also necessary to determine the possible diffusion impact range of the gas based on the diffusion speed of the gas in the soil when it leaks before installing the above-mentioned monitoring and alarm systems in the early stage, so as to accurately install the corresponding control and protection devices, so as to accurately prevent the leakage of buried gas pipelines from the source. In the prior art, there is no report on an experimental device specifically used to study the leakage and diffusion of buried gas pipelines. Summary of the invention

[0004] In view of the above-mentioned deficiencies, the technical problem to be solved by the present invention is to provide an experimental device with a simple structure and convenient operation for studying the leakage and diffusion of buried gas pipelines. This device can simulate the diffusion speed and range of fuel in the soil when a buried gas pipeline leaks.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] The experimental device for studying the leakage and diffusion of buried gas pipelines includes a fuel tank filled with fuel, a first pressure transmitter, a first flow meter, a soil box, a second pressure transmitter and a second flow meter which are sequentially installed on the transmission pipeline.

[0007] The output port of the high-pressure fuel tank is connected to the first pressure transmitter after passing through a pipeline safety device. A test tube with a leakage hole is installed in the soil box. One end of the test tube is connected to the first flow meter through a flange, and the other end thereof is connected to the second pressure transmitter after passing through the shell of the soil box. A sensor array is provided in the soil box, and the sensor array is connected to a host computer through a wireless communication module. The output end of the second flow meter is connected to a recovery tank.

[0008] In the above scheme, the pipeline safety device is used to ensure the safe transportation of fuel in the delivery pipeline. It includes a buffer tank and a pressure reducing valve. One end of the buffer tank is connected to the high-pressure fuel tank after a control valve, and the other end is connected to the input end of the pressure reducing valve. The output end of the pressure reducing valve is connected to the first pressure transmitter.

[0009] In the above scheme, the sensor array used to detect and determine the scope of gas leakage is mainly composed of m*n sensor elements, wherein the m*n sensor elements are evenly spaced in the shell of the soil box, and each sensor element includes a methane concentration sensor and a temperature sensor, and m and n are both integers ≥3.

[0010] In the above solution, a safety valve may be installed on the top of the buffer tank.

[0011] In the above solution, a safety valve may be installed on the top of the recovery tank.

[0012] In the above solution, a control valve may be installed on the delivery pipeline between the first flow meter and the experimental tube.

[0013] The beneficial effects of the present invention are:

[0014] The present invention provides a soil box, in which an experimental tube with a leakage hole is installed, and a sensor array is installed in the soil box, and the sensor array is connected to a host computer through a wireless communication module. The experimental device controls the size of the fuel leakage through the leakage hole set on the experimental tube, detects the location affected by the fuel leakage through the sensor array, and then generates a leakage diffusion model corresponding to the sensor array on the host computer, which is beneficial to the study of buried pipeline leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the experimental device for the leakage and diffusion of buried gas pipelines in this study.

[0016] The numbers in the figure are: 1. delivery pipeline, 2. high-pressure fuel tank, 3. control valve, 4. buffer tank, 5. safety valve, 6. pressure reducing valve, 7-1. first pressure transmitter, 7-2. second pressure transmitter, 8-1. first flow meter, 8-2. second flow meter, 9. flange, 10. experimental tube, 11. soil box, 12. sensor array, 13. recovery tank. DETAILED DESCRIPTION

[0017] like Figure 1 As shown, the experimental device for studying the leakage and diffusion of buried gas pipelines includes a high-pressure fuel tank 2 filled with fuel and a first pressure transmitter 7-1, a first flow meter 8-1, a soil box 11, a second pressure transmitter 7-2 and a second flow meter 8-2 sequentially installed on a delivery pipeline 1. The output port of the high-pressure fuel tank 2 is connected to the first pressure transmitter 7-1 after passing through a pipeline safety device.

[0018] A test tube 10 with a leakage hole is installed in the soil box 11. One end of the test tube 10 is connected to the first flow meter 8-1 through a flange 9, and the other end thereof is connected to the second pressure transmitter 7-2 after passing through the shell of the soil box 11. A control valve 3 is installed on the delivery pipeline 1 between the first flow meter 8-1 and the test tube 10.

[0019] The output end of the second flow meter 8-2 is connected to a recovery tank 13. In order to control the flow rate of the remaining fuel into the recovery tank 13, a valve can be connected between the recovery tank 13 and the second flow meter 8-2. A safety valve 5 is installed on the top of the recovery tank 13.

[0020] A sensor array 12 is provided in the soil box 11, and the sensor array 12 is connected to a host computer via a wireless communication module. In this embodiment, the sensor array 12 is mainly composed of m*n sensor elements. The m*n sensor elements are evenly spaced and distributed in the shell of the soil box 11, and each sensor element includes a methane concentration sensor and a temperature sensor, and m and n are both integers ≥3.

[0021] The pipeline safety device includes a buffer tank 4 and a pressure reducing valve 6. One end of the buffer tank 4 is connected to the high-pressure fuel tank 2 through a control valve 3, and the other end is connected to the input end of the pressure reducing valve 6. The output end of the pressure reducing valve 6 is connected to the first pressure transmitter 7-1. A safety valve 5 is installed on the top of the buffer tank 4.

[0022] When using this experimental device:

[0023] 1) According to the set value of the experimental study, a leakage hole of a corresponding size is opened on the experimental tube 10, and a corresponding number of sensor elements are arranged in the soil box 11 filled with soil. The spacing distance between the sensor elements and the shape of the distribution of the sensor array 12 can be set according to the actual experimental research objectives;

[0024] 2) Eliminate static electricity on the operator, confirm that all valves are closed, and open windows to keep the device in a ventilated state;

[0025] 3) Open the control valve 3 connected to the high-pressure fuel tank 2;

[0026] 4) Open the pressure reducing valve 6 to adjust the pressure in the delivery pipeline 1;

[0027] 5) Observe the reading of the first pressure transmitter 7-1. When the detected pressure reaches the target pressure value, open the control valve 3 connected to the first flow meter 8-1, and the fuel in the high-pressure fuel tank 2 flows from the delivery pipeline 1 into the experimental tube 10 in the soil box 11;

[0028] 6) When the fuel flows through the leakage hole on the experimental tube 10, it will leak and overflow. Whenever the methane concentration sensor and the temperature sensor buried in the soil box 11 detect that the fuel is flowing, the signal is immediately fed back to the host computer, and the host computer records and stores the values ​​of the methane concentration sensor array 12 and the temperature sensor array 12 respectively, and detects the pressure value and the fuel delivery flow value in the delivery pipeline 1 before the leakage through the first pressure transmitter 7-1 and the first flow meter 8-1, and detects the pressure value and the fuel delivery flow value in the delivery pipeline 1 after the leakage through the second pressure transmitter 7-2 and the second flow meter 8-2;

[0029] 7) The host computer generates a leakage diffusion model corresponding to the sensor array 12 according to the position distribution of the sensor array 12 and the signal feedback of the corresponding sensor element, and obtains the relevant parameters of the fuel leakage of the test tube 10, such as the diffusion speed of the fuel leakage, the relationship between the size of the leakage hole and the leakage range, by comparing the detection values ​​of the first and second pressure transmitters (7-1, 7-2) and the first and second flow meters (8-1, 8-2);

[0030] 8) The fuel flowing out of the second flow meter 8 - 2 is recovered through the recovery tank 13 .

[0031] The above is only for explaining the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An experimental device for studying the leakage and diffusion of buried gas pipelines, characterized by: The invention comprises a high-pressure fuel tank (2) containing fuel therein, and a first pressure transmitter (7-1), a first flow meter (8-1), a soil box (11), a second pressure transmitter (7-2) and a second flow meter (8-2) which are sequentially installed on a delivery pipeline (1); a control valve (3) is installed on the delivery pipeline (1) between the first flow meter (8-1) and the experimental tube (10); The output port of the high-pressure fuel tank (2) is connected to the first pressure transmitter (7-1) through a pipeline safety device; a test tube (10) with a leakage hole is installed in the soil box (11); one end of the test tube (10) is connected to the first flow meter (8-1) through a flange (9); the other end of the test tube (10) passes through the shell of the soil box (11) and is connected to the second pressure transmitter (7-2); a sensor array (12) is provided in the soil box (11); the sensor array (12) is connected to a host computer through a wireless communication module; and the output end of the second flow meter (8-2) is connected to a recovery tank (13); The pipeline safety device comprises a buffer tank (4) and a pressure reducing valve (6), one end of the buffer tank (4) is connected to the high-pressure fuel tank (2) via a control valve (3), and the other end is connected to the input end of the pressure reducing valve (6), and the output end of the pressure reducing valve (6) is connected to a first pressure transmitter (7-1); The sensor array (12) is mainly composed of m*n sensor elements, wherein the m*n sensor elements are evenly spaced and distributed in the shell of the soil box (11), and each sensor element includes a methane concentration sensor and a temperature sensor, and m and n are both integers ≥3; The host computer generates a leakage diffusion model corresponding to the sensor array (12) according to the position distribution of the sensor array (12) and the signal feedback of the corresponding sensor element, and obtains relevant parameters of the fuel leakage of the test tube (10) by comparing the detection values ​​of the first pressure transmitter (7-1), the second pressure transmitter (7-2), the first flow meter (8-1), and the second flow meter (8-2).

2. The experimental device for studying leakage and diffusion of buried gas pipelines according to claim 1 is characterized by: A safety valve (5) is installed on the top of the buffer tank (4).

3. The experimental device for studying leakage and diffusion of buried gas pipelines according to claim 1 is characterized by: A safety valve (5) is installed on the top of the recovery tank (13).

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