Gas pipeline leakage detection vehicle structure carrying laser detection and method

Abstract

The invention discloses a gas pipeline leakage detection vehicle structure carrying laser detection and a method. The structure comprises a detection vehicle body, a meteorological detection structure and a gas detection structure, the meteorological detection structure is arranged at the top of the detection vehicle body; the gas detection structure is arranged in the detection vehicle body; the fuel gas detection structure comprises a detection gas inlet, a detection gas connecting pipeline, a fuel gas detector, a detection gas diffusing pipeline, a vehicle-mounted stabilizing device and a computer control system; the meteorological detection structure comprises an anemograph, a meteorological data detector and a positioning system; and the anemograph is arranged in front of the meteorological data detector and the positioning system. The detection gas inlet is formed in the front end of the detection vehicle body and is connected with the vehicle-mounted stabilizing device through the detection gas connecting pipeline; the other end of the vehicle-mounted stabilizing device is connected with a detection gas diffusion pipeline; and the fuel gas detector is arranged above the vehicle-mounted stabilizing device and is connected with the computer control system. According to the invention, the detection precision and the detection efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to a gas pipeline leakage detection vehicle structure and method equipped with laser detection. Background Art

[0002] Natural gas pipelines are usually laid underground, and their leak detection is usually done on-site with portable equipment. However, due to the fact that some places where pipelines are located are difficult for personnel to reach, the accuracy of the detection equipment carried by personnel is limited, and the detection efficiency is extremely low. Therefore, it is difficult to detect leaks in buried natural gas pipelines quickly and effectively.

[0003] At present, there are two methods for leak detection of natural gas pipelines: on-site detection with portable equipment, that is, walking along the gas pipeline with backpack detection equipment. Another method is airborne detection by drones, which uses drones to carry out detection. Due to the weight and usage conditions of portable detection equipment and airborne detection equipment, the detection equipment and technical indicators used are difficult to meet the requirements of precision detection and detection efficiency.

[0004] Therefore, how to invent a detection vehicle and detection method equipped with efficient and accurate detection technology to meet the detection accuracy and improve the detection efficiency has become an urgent problem to be solved. Summary of the invention

[0005] To this end, the present invention provides a gas pipeline leak detection vehicle structure and method equipped with laser detection, which uses the laser detection technology to accurately detect gas leaks in gas pipelines, thereby improving the detection accuracy. At the same time, the vehicle-mounted gas detection is used to greatly improve the pipeline detection efficiency.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a gas pipeline leakage detection vehicle structure equipped with laser detection, comprising a detection vehicle body, a meteorological detection structure and a gas detection structure; the meteorological detection structure is arranged on the top of the detection vehicle body; the gas detection structure is arranged inside the detection vehicle body;

[0007] The gas detection structure includes a detection gas inlet, a detection gas connecting pipeline, a gas detector, a detection gas release pipeline, a vehicle-mounted stabilization device and a computer control system;

[0008] The meteorological detection structure comprises an anemometer, a meteorological data detector and a positioning system; the anemometer is arranged in front of the meteorological data detector and the positioning system.

[0009] As a preferred solution for the structure of a gas pipeline leakage detection vehicle equipped with laser detection, the detection gas inlet is arranged at the front end of the detection vehicle body, and the detection gas inlet is connected to the vehicle-mounted stabilization device through the detection gas connecting pipe; the other end of the vehicle-mounted stabilization device is connected to the detection gas release pipe; the gas detector is arranged above the vehicle-mounted stabilization device and is connected to the computer control system.

[0010] The present invention also provides a gas pipeline leakage detection method equipped with laser detection, comprising:

[0011] The detection gas is sucked in by a suction pump built into the vehicle-mounted stabilization device, and the detection gas is transported to the gas detector;

[0012] The gas detector detects the detection gas by setting the detection technology to obtain detection data;

[0013] The computer control system performs analysis and calculation based on the detection data, in combination with the anemometer, the meteorological data detector and the positioning system, by setting the control calculation software to obtain the gas leakage location and gas leakage concentration information, and generate a parameter report;

[0014] After the computer control system completes the analysis, the detection gas is discharged into the atmosphere.

[0015] As a preferred solution of a gas pipeline leakage detection method equipped with laser detection, in the process of sucking the detection gas through the suction pump built into the vehicle-mounted stabilization device, the detection gas is sucked in through the detection gas inlet and transported to the vehicle-mounted stabilization device through the detection gas connecting pipeline.

[0016] As a preferred solution for a gas pipeline leak detection method equipped with laser detection, in the process of the gas detector detecting the detection gas by setting the detection technology, the methane and ethane concentrations in the detection gas are accurately detected at the ppb level through the optical cavity ring-down laser technology to obtain the detection data.

[0017] As a preferred solution of a gas pipeline leakage detection method equipped with laser detection, during the analysis and calculation process of the computer control system through the setting control calculation software, the gas diffusion concentration is calculated by the Pasquill-Gifford diffusion model; the calculation formula of the Pasquill-Gifford diffusion model is:

[0018]

[0019] Where C(x,y,z) is the average leakage concentration, in g / m 3; μ is wind speed, unit is m / s; G is continuous leakage rate, unit is g / s; б x б y б z They are the standard deviations of wind direction concentration in x, y, and z directions respectively; y is the distance perpendicular to the wind direction, in meters; z is the distance from the inside, in meters; H is the height of the leakage source, in meters.

[0020] As a preferred solution of a gas pipeline leakage detection method equipped with laser detection, during the analysis and calculation by the computer control system through the setting control calculation software, the calculation formula for the position where the maximum concentration on the ground downwind occurs is:

[0021]

[0022] In the formula, z is the standard deviation of the wind direction concentration in the z direction; H is the height of the leakage source, in meters.

[0023] As a preferred solution of a gas pipeline leakage detection method equipped with laser detection, during the analysis and calculation by the computer control system through the setting control calculation software, the calculation formula for the maximum concentration along the x-axis on the ground is:

[0024]

[0025] In the formula, C x is the maximum concentration along the x-axis on the ground; e is a natural constant.

[0026] As a preferred solution for a gas pipeline leak detection method equipped with laser detection, the parameter report includes: an inspection report, a leakage source summary and inspection data.

[0027] As a preferred solution of a gas pipeline leakage detection method equipped with laser detection, in the process of discharging the detection gas into the atmosphere, the detection gas is discharged into the atmosphere through a detection gas discharging pipe.

[0028] The present invention has the following advantages: the present invention includes a detection vehicle body, a meteorological detection structure and a gas detection structure; the meteorological detection structure is arranged on the top of the detection vehicle body; the gas detection structure is arranged inside the detection vehicle body; the gas detection structure includes a detection gas inlet, a detection gas connecting pipeline, a gas detector, a detection gas dispersing pipeline, a vehicle-mounted stabilizing device and a computer control system; the meteorological detection structure includes an anemometer and a meteorological data detector, and a positioning system; the anemometer is arranged in front of the meteorological data detector and the positioning system. The detection gas inlet is arranged at the front end of the detection vehicle body, and the detection gas inlet is connected to the vehicle-mounted stabilizing device through the detection gas connecting pipeline; the other end of the vehicle-mounted stabilizing device is connected to the detection gas dispersing pipeline; the gas detector is arranged above the vehicle-mounted stabilizing device and is connected to the computer control system. In the detection process, the present invention inhales the detection gas through the suction pump built into the vehicle-mounted stabilization device, and delivers the detection gas to the gas detector; the gas detector detects the detection gas by setting the detection technology to obtain the detection data; the computer control system analyzes and calculates the detection data, combines the anemometer, the meteorological data detector and the positioning system, and obtains the gas leakage location and gas leakage concentration information by setting the control calculation software, and generates a parameter report; after the computer control system completes the analysis, it discharges the detection gas into the atmosphere. The present invention uses a gas pipeline leakage detection vehicle equipped with laser detection technology to accurately detect gas leaks on gas pipelines, and can distinguish the interference of gas, biogas and other gases in real time, and accurately determine the source of leakage. The present invention uses vehicle-mounted gas detection to greatly improve the detection efficiency of pipelines. The present invention assists gas system management decisions by combining multiple inspection data with the pipeline network GIS system and pipeline network leakage data. At the same time, the present invention evaluates the safety of existing gas pipelines through system control software, and assists users to take reasonable measures to maintain gas pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0030] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0031] Figure 1 This is a schematic structural diagram of a gas pipeline leak detection vehicle equipped with laser detection provided in Example 1 of the present invention;

[0032] Figure 2 This is a schematic flow chart of a gas pipeline leakage detection method equipped with laser detection provided in Example 2 of the present invention;

[0033] In the figure, 1. Detection gas inlet; 2. Detection gas connecting pipeline; 3. Detection vehicle body; 4. Anemometer; 5. Meteorological data detector, positioning system; 6. Gas detector; 7. Detection gas release pipeline; 8. Vehicle-mounted stabilization device; 9. Computer control system. DETAILED DESCRIPTION

[0034] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1 Embodiment 1 of the present invention provides a gas pipeline leakage detection vehicle structure equipped with laser detection, including a detection vehicle body 3, a meteorological detection structure and a gas detection structure; the meteorological detection structure is arranged on the top of the detection vehicle body 3; the gas detection structure is arranged inside the detection vehicle body 3;

[0037] The gas detection structure includes a detection gas inlet 1, a detection gas connecting pipeline 2, a gas detector 6, a detection gas release pipeline 7, a vehicle-mounted stabilizing device 8 and a computer control system 9;

[0038] The meteorological detection structure includes an anemometer 4 and a meteorological data detector and a positioning system 5 ; the anemometer 4 is arranged in front of the meteorological data detector and the positioning system 5 .

[0039] In this embodiment, the detection gas inlet 1 is arranged at the front end of the detection vehicle body 3, and the detection gas inlet 1 is connected to the vehicle-mounted stabilization device 8 through the detection gas connecting pipe 2; the other end of the vehicle-mounted stabilization device 8 is connected to the detection gas release pipe 7; the gas detector 6 is arranged above the vehicle-mounted stabilization device 8 and is connected to the computer control system 9.

[0040] Specifically, the vehicle-mounted stabilizing device 8 has a built-in suction pump, which sucks in the detection gas; the detection gas passes through the detection gas inlet 1 and then enters the vehicle-mounted stabilizing device 8 through the detection gas connecting pipe 2; the vehicle-mounted stabilizing device 8 transports the detection gas to the gas detector 6, and the gas detector 6 detects the inspection gas to obtain inspection data; based on the inspection data, the computer control system 9 combines the anemometer 4 and the meteorological data detector and the positioning system 5 to perform analysis and calculation to obtain the gas leakage location and gas leakage concentration information, and generate a parameter report; the detection gas after the detection is discharged into the atmosphere through the detection gas release pipe 7.

[0041] In summary, the present invention includes a detection vehicle body, a meteorological detection structure and a gas detection structure; the meteorological detection structure is arranged on the top of the detection vehicle body; the gas detection structure is arranged inside the detection vehicle body; the gas detection structure includes a detection gas inlet, a detection gas connecting pipe, a gas detector, a detection gas dispersing pipe, a vehicle-mounted stabilizing device and a computer control system; the meteorological detection structure includes an anemometer and a meteorological data detector, and a positioning system; the anemometer is arranged in front of the meteorological data detector and the positioning system. The detection gas inlet is arranged at the front end of the detection vehicle body, and the detection gas inlet is connected to the vehicle-mounted stabilizing device through the detection gas connecting pipe; the other end of the vehicle-mounted stabilizing device is connected to the detection gas dispersing pipe; the gas detector is arranged above the vehicle-mounted stabilizing device and is connected to the computer control system. The vehicle-mounted stabilizing device has a built-in suction pump, which sucks in the detection gas; the detection gas passes through the detection gas inlet and then enters the vehicle-mounted stabilizing device through the detection gas connecting pipe; the vehicle-mounted stabilizing device transports the detection gas to the gas detector, which detects the inspection gas and obtains inspection data; based on the inspection data, the computer control system combines the anemometer and the meteorological data detector and the positioning system to perform analysis and calculation to obtain the gas leakage location and gas leakage concentration information, and generate a parameter report; the detection gas is discharged into the atmosphere through the detection gas release pipe. The present invention uses a gas pipeline leak detection vehicle equipped with laser detection technology to accurately detect gas leaks in gas pipelines, and can distinguish the interference of gas, biogas and other gases in real time, and accurately determine the source of the leak. The present invention uses vehicle-mounted gas detection to greatly improve the detection efficiency of the pipeline.

[0042] Example 2

[0043] See also Figure 2 Embodiment 2 of the present invention further provides a gas pipeline leakage detection method equipped with laser detection, comprising:

[0044] S1. Inhale the test gas through the built-in suction pump of the vehicle-mounted stabilization device, and transport the test gas to the gas detector;

[0045] S2, the gas detector detects the detection gas by setting the detection technology to obtain detection data;

[0046] S3, the computer control system performs analysis and calculation based on the detection data, in combination with the anemometer, the meteorological data detector and the positioning system, by setting the control calculation software to obtain the gas leakage location and gas leakage concentration information, and generate a parameter report;

[0047] S4. After the computer control system completes the analysis, the detection gas is discharged into the atmosphere.

[0048] In this embodiment, in step S1, the detection gas is sucked in by the built-in suction pump of the vehicle-mounted stabilization device, and the detection gas is delivered to the gas detector;

[0049] Specifically, the detection gas is sucked in through the detection gas inlet and delivered to the vehicle-mounted stabilization device through the detection gas connection pipeline. The vehicle-mounted stabilization device delivers the detection gas to the gas detector.

[0050] In this embodiment, in step S2, the gas detector detects the detection gas by setting the detection technology to obtain detection data;

[0051] Specifically, the gas detector performs ppb-level precise detection of the methane and ethane concentrations in the detection gas through cavity ring-down laser technology to obtain the detection data.

[0052] In this embodiment, in step S3, the computer control system performs analysis and calculation based on the detection data, in combination with the anemometer, the meteorological data detector and the positioning system, by setting the control calculation software to obtain the gas leakage location and gas leakage concentration information, and generate a parameter report;

[0053] Specifically, the computer control system uses control software to detect the gas detection range, leakage rate, and identify methanol and ethane. It uses algorithms to narrow the leakage detection area to determine the specific location of the high-level pipeline.

[0054] In this embodiment, during the process of analysis and calculation performed by the computer control system through the setting control calculation software, the gas diffusion concentration is calculated by the Pasquill-Gifford diffusion model; the calculation formula of the Pasquill-Gifford diffusion model is:

[0055]

[0056] Where C(x,y,z) is the average leakage concentration, in g / m 3 ; μ is wind speed, unit is m / s; G is continuous leakage rate, unit is g / s; б x б y б z They are the standard deviations of wind direction concentration in x, y, and z directions respectively; y is the distance perpendicular to the wind direction, in meters; z is the distance from the inside, in meters; H is the height of the leakage source, in meters.

[0057] In this embodiment, the calculation formula for the position where the maximum concentration on the downwind ground occurs is:

[0058]

[0059] In the formula, z is the standard deviation of the wind direction concentration in the z direction; H is the height of the leakage source, in meters.

[0060] In this embodiment, the calculation formula for the maximum concentration along the x-axis on the ground is:

[0061]

[0062] In the formula, C x is the maximum concentration along the x-axis on the ground; e is a natural constant.

[0063] In this embodiment, the parameter report includes: an inspection report, a leakage source summary and inspection data.

[0064] In this embodiment, in step S4, after the computer control system completes the analysis, the detection gas is discharged into the atmosphere.

[0065] Specifically, after the detection is completed, the detection gas is discharged into the atmosphere through the detection gas discharging pipeline.

[0066] In a possible embodiment, a verification example is provided as follows:

[0067] The technical parameters of the inspection vehicle are shown in Table 1:

[0068] Detection gas type Function sampling method Sensitivity Protection level Response time Remark Methane Pump Suction 1ppb IP54 Less than 1s Ethane Pump Suction 5ppb IP54 Less than 0.1s

[0069] Table 1 Technical parameters of inspection vehicle

[0070] The specially designed optical cavity ring-down leak detection device can detect natural gas leakage at the ppb level. After diffusion rate calculation and verification, the invention can detect trace gas leakage within a radius of 150 meters. After repeated tests, the optimal driving speed of the vehicle is 50 kilometers per hour.

[0071] In summary, the present invention inhales the detection gas through the suction pump built into the vehicle-mounted stabilization device, and delivers the detection gas to the gas detector; the gas detector detects the detection gas by setting the detection technology to obtain the detection data; the computer control system analyzes and calculates the detection data based on the detection data, combined with the anemometer, meteorological data detector and positioning system, by setting the control calculation software to obtain the gas leakage location and gas leakage concentration information, and generate a parameter report; after the computer control system completes the analysis, it discharges the detection gas into the atmosphere. The present invention uses vehicle-mounted gas detection to greatly improve the detection efficiency of the pipeline. The present invention assists the gas system management decision-making by combining multiple inspection data with the pipeline network GIS system and pipeline network leakage data. At the same time, the present invention evaluates the safety of existing gas pipelines through system control software, and assists users to take reasonable measures to maintain gas pipelines.

[0072] The present invention is described in more detail and in greater detail above through general description and specific embodiments. It should be understood that, based on the technical concept of the present invention, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present invention, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present invention.

Claims

1. A gas pipeline leak detection vehicle structure equipped with laser detection, characterized in that: It comprises a detection vehicle body (3), a meteorological detection structure and a gas detection structure; the meteorological detection structure is arranged on the top of the detection vehicle body (3); the gas detection structure is arranged inside the detection vehicle body (3); The gas detection structure comprises a detection gas inlet (1), a detection gas connecting pipeline (2), a gas detector (6), a detection gas release pipeline (7), a vehicle-mounted stabilization device (8) and a computer control system (9); The meteorological detection structure comprises an anemometer (4) and a meteorological data detector and a positioning system (5); the anemometer (4) is arranged in front of the meteorological data detector and the positioning system (5).

2. The gas pipeline leak detection vehicle structure equipped with laser detection according to claim 1 is characterized in that: The detection gas inlet (1) is arranged at the front end of the detection vehicle body (3), and the detection gas inlet (1) is connected to the vehicle-mounted stabilizing device (8) through the detection gas connecting pipe (2); the other end of the vehicle-mounted stabilizing device (8) is connected to the detection gas discharging pipe (7); the gas detector (6) is arranged above the vehicle-mounted stabilizing device (8) and is connected to the computer control system (9).

3. A gas pipeline leak detection method equipped with laser detection, characterized in that: include: The detection gas is sucked in by a suction pump built into the vehicle-mounted stabilization device, and the detection gas is transported to the gas detector; The gas detector detects the detection gas by setting the detection technology to obtain detection data; The computer control system performs analysis and calculation based on the detection data, in combination with the anemometer, the meteorological data detector and the positioning system, by setting the control calculation software to obtain the gas leakage location and gas leakage concentration information, and generate a parameter report; After the computer control system completes the analysis, the detection gas is discharged into the atmosphere.

4. A gas pipeline leak detection method equipped with laser detection according to claim 3, characterized in that: In the process of sucking the detection gas through the suction pump built into the vehicle-mounted stabilizing device, the detection gas is sucked in through the detection gas inlet and transported to the vehicle-mounted stabilizing device through the detection gas connecting pipeline.

5. A gas pipeline leak detection method equipped with laser detection according to claim 4, characterized in that: In the process of the gas detector detecting the detection gas by using the set detection technology, the concentrations of methane and ethane in the detection gas are accurately detected at the ppb level by using the cavity ring-down laser technology to obtain the detection data.

6. A gas pipeline leak detection method equipped with laser detection according to claim 5, characterized in that: During the process of analysis and calculation by the computer control system through the setting control calculation software, the gas diffusion concentration is calculated by the Pasquill-Gifford diffusion model; the calculation formula of the Pasquill-Gifford diffusion model is: Where, C (x, y, z) is the average leakage concentration, unit is g / m3; is the wind speed, in m / s; G is the continuous leakage rate, in g / s; They are the standard deviations of wind direction concentration in x, y, and z directions respectively; y is the distance perpendicular to the wind direction, in meters; z is the distance from the inside, in meters; H is the height of the leakage source, in meters.

7. A gas pipeline leak detection method equipped with laser detection according to claim 6, characterized in that: During the analysis and calculation process of the computer control system through the setting control calculation software, the calculation formula for the position where the maximum concentration on the downwind ground occurs is: In the formula, is the standard deviation of the wind direction concentration in the z direction; H is the height of the leakage source, in meters.

8. A gas pipeline leak detection method equipped with laser detection according to claim 7, characterized in that: During the analysis and calculation process of the computer control system through the setting control calculation software, the calculation formula for the maximum concentration along the x-axis on the ground is: C x = In the formula, C x is the maximum concentration along the x-axis on the ground; e is a natural constant.

9. A gas pipeline leak detection method equipped with laser detection according to claim 8, characterized in that: The parameter report includes: inspection report, leakage source summary and inspection data.

10. A gas pipeline leak detection method equipped with laser detection according to claim 9, characterized in that: In the process of discharging the detection gas into the atmosphere, the detection gas is discharged into the atmosphere through a detection gas discharging pipeline.

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