Gas escape detection device and application

Abstract

The invention provides a gas dissipation detection device, and belongs to the technical field of gas detection devices. The device comprises a sampling accessory, a pneumatic module and a laser methane detection module, escaped gas is sucked into the long-optical-path gas pool from the gas inlet interface through the sampling accessory and then is discharged through the gas outlet interface; a laser of the laser methane detection module emits laser into a long-optical-path gas pool and then transmits the laser to a photoelectric detector through a light outlet, the photoelectric detector receives an optical signal and converts the optical signal into an electric signal, data processing is carried out through a signal processing module, and the concentration of escape gas is calculated; and the gas dissipation rate and dissipation flux are calculated by combining the sampling flow of the gas flowmeter and the concentration of the dissipated gas. On the basis of a tunable semiconductor laser absorption spectrum and a multi-optical-path enhanced absorption technology, the gas dissipation concentration of field equipment is obtained, and the gas dissipation rate and the gas dissipation flux are calculated through the sampling flow and the concentration of the dissipation gas in combination with the sampling flow.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection devices, and in particular to a gas escape detection device and application of the detection device in methane escape detection at oil and gas stations. Background Art

[0002] Methane, a major component of natural gas, is a relatively clean gas that produces fewer greenhouse gases than traditional fuels like coal and oil. Its high energy density makes it a highly efficient fuel and widely used in gas supply, energy production, and industrial production. However, methane also presents its own challenges and environmental concerns. Methane is a flammable and explosive gas. When its concentration in the air reaches a certain threshold, it can easily explode, leading to safety incidents. Furthermore, as a greenhouse gas, its release into the atmosphere has a greater greenhouse effect than carbon dioxide. Methane fugitive emissions refer to the uncontrolled release of methane into the atmosphere during the extraction, processing, or transportation of natural gas or oil. If methane fugitive emissions and their associated effects are not accounted for, the sharp increase in natural gas consumption will directly impact the effectiveness of natural gas in the green and low-carbon energy transition. As a critical component of the oil and gas industry, quantitative monitoring of methane fugitive emissions at oil and gas stations plays a crucial role in effectively controlling methane emissions. Summary of the Invention

[0003] In light of this, the present invention aims to provide a gas escape detection device that uses tunable semiconductor laser absorption spectroscopy and multi-path enhanced absorption technology to obtain gas escape concentrations from field equipment. Combined with a sampling flow rate, this device can collect escaped gas and ambient air at high flow rates from the escape element. By accurately measuring the sampling flow rate and the concentration of the escaped gas, the gas escape rate and gas escape flux can be calculated. This data can also be transmitted to a host computer via WiFi, resulting in highly accurate, real-time visualization of the detection results.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A gas escape detection device includes a sampling accessory, a pneumatic module disposed in a device host, and a laser methane detection module;

[0006] The escaped gas is sucked in from the air inlet interface of the pneumatic module through the sampling accessory, transported to the long optical path gas pool of the pneumatic module after passing through the gas flow meter, and then discharged through the air outlet interface of the pneumatic module;

[0007] The laser of the laser methane detection module emits laser light, which is transmitted into the long optical path gas pool and then transmitted from the light outlet of the long optical path gas pool to the photoelectric detector of the laser methane detection module. The photoelectric detector receives the light signal and converts it into an electrical signal. The signal processing module of the laser methane detection module processes the data and calculates the concentration of the escaped gas.

[0008] The gas escape rate and the escape flux are calculated based on the sampling flow rate of the gas flow meter and the concentration of the escaped gas.

[0009] Preferably, the pneumatic module further comprises a uniform mixing chamber connected between the gas flow meter and the air inlet interface.

[0010] Preferably, the pneumatic module further includes a filter connected between the air inlet interface and the gas flow meter.

[0011] Preferably, the pneumatic module further comprises an air pump connected between the filter and the uniform mixing chamber.

[0012] Preferably, the uniform mixing chamber is composed of a buffer gas cylinder and a porous medium filled therein.

[0013] Preferably, the front panel of the device host is provided with an adjustment knob for adjusting the intake air flow rate and a flow adjustment dial for indicating the intake air flow rate.

[0014] Preferably, during measurement, the sampling accessory is wrapped around the part to be tested, and the edge of the sampling accessory is sealed in contact with the part to be tested to ensure airtightness during the test process.

[0015] Preferably, the inner wall of the long optical path gas pool is plated with a high reflectivity metal film.

[0016] Preferably, the signal processing module includes a harmonic signal processing module, a concentration inversion processing module and a gas escape flux calculation comprehensive processing and transmission module.

[0017] On the other hand, the present invention provides an application of the above-mentioned gas escape detection device in the detection of methane escape in oil and gas stations.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The gas emission detection device provided by the present invention uses tunable semiconductor laser absorption spectroscopy and multi-path enhanced absorption technology to obtain gas emission concentrations from on-site equipment. Combined with the sampling flow rate, it can collect gas and ambient air at a high flow rate from the emission element. By accurately measuring the sampling flow rate and the concentration of emitted methane, it can calculate the methane emission rate and emission flux. This data can also be transmitted to a host computer via WiFi, providing high-precision, real-time visualization of the detection results.

[0020] Other technical effects of the present invention will be described in detail in the following specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the internal structure of the device host of the present invention;

[0022] Figure 2 is a side view of the present invention;

[0023] Figure 3 It is a rear view of the present invention;

[0024] Figure 4 This is a schematic diagram of the connection of the sampling accessories of the present invention;

[0025] In the figure: 1. Flow adjustment dial; 2. Adjustment knob; 3. Air inlet interface; 4. Exhaust interface; 5. Start button 5; 6. Glue stick antenna; 7. Portable handle; 8. Heat dissipation hole; 9. Power interface; 10. Power indicator; 11. Filter; 12. Air pump; 13. Uniform mixing chamber; 14. Gas flow meter; 15. Long optical path gas pool; 16. Laser; 17. Photoelectric detector; 18. Signal processing module; 19. Battery box; 20. WIFI serial port server; 21. Optical fiber; 22. Gas guide hose; 23. Equipment host; 24. Sampling accessories; 25. Equipment air inlet interface sampling connection hose; 26. Equipment exhaust interface connection hose; 27. Control valve 1; 28. Control valve 2. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] like Figure 1-4 As shown, the present invention provides a gas escape detection device, including a sampling accessory 24, a pneumatic module and a laser methane detection module provided in a device host 23;

[0030] The escaped gas is sucked from the air inlet port 3 of the pneumatic module through the sampling accessory 24, transported to the long optical path gas pool 15 of the pneumatic module after passing through the gas flow meter 14, and then discharged through the air outlet port of the pneumatic module;

[0031] The laser 16 of the laser methane detection module emits laser light, which is then transmitted into the long optical path gas pool 15 and then transmitted from the light outlet of the long optical path gas pool 15 to the photoelectric detector 17 of the laser methane detection module. The photoelectric detector 17 receives the light signal and converts it into an electrical signal. The signal processing module 18 of the laser methane detection module processes the data and calculates the concentration of the escaped gas.

[0032] The gas escape rate and the escape flux are calculated based on the sampling flow rate of the gas flow meter 14 and the concentration of the escaped gas.

[0033] In the above-mentioned gas escape detection device provided by the present invention, if Figure 2 As shown, the front panel of the device host 23 is provided with a flow adjustment dial 1, an adjustment knob 2 is provided on the right side of the flow adjustment dial 1, an air intake interface 3 and an exhaust interface 4 are provided above the flow adjustment dial 1, a start button and a rubber stick antenna are provided on the left side of the flow adjustment dial 1, and the rubber stick antenna is on one side of the start button. Heat dissipation holes 8 are provided on the left and right sides of the device host 23, and portable handles 7 are provided on the left and right sides of the front panel of the device host 23. The rear panel of the device host 23 is provided with a power indicator 10, and a power interface 9 is provided on the right side of the power indicator 10.

[0034] In the present invention, the long optical path gas cell 15 is a device used for optical gas measurement. Its core component is a long, narrow space that draws in the gas to be measured. Its main purpose is to increase the propagation distance of light in the gas, thereby improving the accuracy and sensitivity of optical gas measurement.

[0035] The operating principle is that when light passes through the long optical path gas cell 15, it interacts with the molecules in the gas. These interactions include optical processes such as absorption, emission, and scattering, which are closely related to the type and concentration of the gas, as well as the optical path length. By measuring changes in light intensity, information about the gas properties can be obtained.

[0036] The Long Pathlength Gas Cell 15 offers numerous advantages over traditional gas detection methods. First, it offers exceptionally high sensitivity and accuracy, enabling detection of very low gas concentrations. Second, due to the non-contact nature of optical measurement, it enables remote and in-line measurement. Furthermore, the Long Pathlength Gas Cell 15 offers rapid response, excellent repeatability, and a long service life.

[0037] In the present invention, the inner wall of the long optical path gas pool 15 is plated with a high reflectivity metal film with a reflectivity of 98%. The laser hits the high reflectivity gold film on the inner wall of the long optical path gas pool 1515 and causes multiple reflections to increase the gas absorption optical path, and is finally emitted from the light outlet of the long optical path gas pool 15.

[0038] In the present invention, the long optical path gas cell 15 preferably has an optical path of 14.5 m and dimensions of 35 x 15 x 17 cm. It primarily comprises a gas chamber, a reflector, a standard optical fiber 21 connector, a gas inlet and outlet, and a shock-absorbing base. Using the long optical path gas cell 15, an effective optical path lengthened by tens or even hundreds of times can be achieved within a relatively small space. According to Lambert-Beer's law, a longer effective absorption path length for gas absorption results in a higher absorptivity. Therefore, increasing the absorption path length enhances the gas absorption signal and improves the system's signal-to-noise ratio.

[0039] Laser 16 is preferably a single-mode laser 16 with an output wavelength of 1653 nm, and photodetector 17 is an Indium Gallium Arsenide (InGaAs) photodetector 17 with high sensitivity at this wavelength. Laser 16 is preferably packaged in a 14-pin butterfly package. By varying the injection current of laser 16, the output wavelength of laser 16 is swept across the target absorption peak of methane. By processing the laser signal before and after gas absorption, information on the gas's absorption intensity can be obtained, allowing the concentration of the gas to be measured to be calculated.

[0040] In the present invention, the photodetector preferably uses an indium gallium arsenide (InGaAs) detector with higher sensitivity near a wavelength of 1653nm, which is preferably fixed on the signal processing module 18. The signal processing module 18 is preferably fixed inside the device host 23 through a positioning hole to ensure the stability of the circuit.

[0041] In the present invention, the signal processing module 18 includes a harmonic signal processing module 18, a concentration inversion processing module and a gas escape flux calculation comprehensive processing and transmission module.

[0042] The present invention receives the light signal through the photodetector 17 and converts it into an electrical signal, extracts the harmonic signal after passing through the filtering circuit and the amplifying circuit, and then transmits it to the signal processing module 18 through the analog / digital conversion circuit for data processing and concentration inversion. The gas fugitive flux is obtained by combining the real-time sampling flow measured by the gas flowmeter 14 with the concentration of the fugitive gas according to the fugitive flux calculation formula.

[0043] In the present invention, the laser 16 and the photodetector 17 are preferably connected to the long optical path gas chamber by coupling with an optical fiber 21 to improve the laser transmission stability and the measurement signal-to-noise ratio.

[0044] In the present invention, the pneumatic module further includes a uniform mixing chamber 13 connected between the gas flow meter 14 and the air inlet interface 3 .

[0045] Among them, the uniform mixing chamber 13 is preferably composed of a buffer gas cylinder and a porous medium filled inside, so that the escaped methane and air are evenly mixed, ensuring that the measured concentration conforms to the actual mixing ratio. The gas in the uniform mixing chamber 13 passes through the gas flowmeter 14 and reaches the interior of the long optical path gas chamber, and then is discharged through the gas outlet of the long optical path gas chamber through the gas outlet joint, thereby forming a complete gas circuit.

[0046] In the present invention, the pneumatic module further includes a filter 11 connected between the air inlet port 3 and the gas flow meter 14, which is used to block water vapor and dust particles and reduce damage to the pipeline system and the laser methane concentration measurement system.

[0047] In the present invention, the pneumatic module further includes an air pump 12 connected between the filter 11 and the uniform mixing chamber 13. The air pump 12 is preferably screwed into the equipment host 23 through a fixing device to provide flow power for the entire equipment system.

[0048] In the present invention, the front panel of the device main unit 23 is provided with an adjustment knob 2 for adjusting the intake air flow and a flow adjustment dial 1 for indicating the intake air flow. The adjustment knob 2 is used to adjust the sampling flow of the detection device, with a sampling flow adjustment range of 0-6L / min. The adjustment knob 2 can independently turn on / off the air pump 12.

[0049] The device host 23 of the present invention is also equipped with a battery box 19 and a WIFI serial port server 20. The battery box 19 is used for power supply and uses a 3000mAh explosion-proof lithium battery. The WIFI serial port server 20 transmits data to the host computer via WiFi, thereby obtaining high-precision, real-time visual detection results.

[0050] The connection method of the components of the pneumatic module and the laser methane detection module in the gas escape detection device provided by the present invention can be as follows:

[0051] like Figure 1 As shown, the device host 23 includes a pneumatic module, a laser methane detection module, a battery box 19, and a WIFI serial port server 20; the pneumatic module consists of a sampling air inlet interface 3, an exhaust interface 4, a filter 11, an air pump 12, a uniform mixing chamber 13, a gas flow meter 14, a long optical path gas pool 15 and a gas guide hose 22. The sampling air inlet interface 3 is connected to the filter 11 through the gas guide hose 22, the air inlet of the air pump 12 is connected to the filter 11 through the gas guide hose 22, the air outlet of the air pump 12 is connected to the uniform mixing chamber 13 through the gas guide hose 22, and the uniform mixing chamber 13 is connected to the gas flow meter 14 through the gas guide hose 22. The laser methane detection module is composed of a long optical path gas pool 15, a laser 16, a photoelectric detector 17, an optical fiber 21 and a signal processing module 18. The laser 16, the photoelectric detector 17 and the long optical path gas pool 15 are coupled through the optical fiber 21. The laser 16 is arranged on the side of the signal processing module 18, the photoelectric detector 17 is fixed above the signal processing module 18, and the signal processing module 18 is fixed inside the device host 23 through a positioning hole.

[0052] like Figure 4 As shown, the connection between the sampling accessory 24 and the device host 23 can be achieved in the following manner:

[0053] The equipment exhaust interface connecting hose 26 is connected to the exhaust interface 4 of the equipment main unit 23, and one end of the equipment air inlet interface sampling connecting hose 25 is connected to the air inlet interface 3 of the equipment main unit 23, and the other end is connected to the sampling accessory 24. The sampling accessory 24 is provided with a regulating valve 1 27 and a regulating valve 2 28 at both ends. The lower port of the regulating valve 1 27 is connected to the air inlet interface 3 of the equipment main unit 23, and the regulating valve 2 28 is connected to the external gas.

[0054] The setting of regulating valve 1 27 and regulating valve 2 28 allows users to flexibly adjust the gas flow path according to the needs of the actual detection environment. Regulating valve 1 27 is mainly responsible for controlling the gas flow from the sampling accessory 24 to the device host 23, ensuring that the gas sample can stably enter the host for detection. Regulating valve 2 28 is used to adjust the introduction of external gas, which is very useful in certain specific detection scenarios, such as when it is necessary to compare the background gas concentration of the environment. By adjusting these two valves, precise control of the gas sample can be achieved, thereby improving the accuracy and reliability of the detection. In addition, the design of the regulating valve also takes into account the convenience of operation, so that non-professionals can quickly get started and perform effective gas detection.

[0055] In the present invention, the sampling accessory 24 is wrapped around the part to be tested during measurement. The edge of the sampling accessory 24 is sealed against the part to be tested, ensuring airtightness during the test. The vent holes in the sampling accessory 24 allow for the inflow of outside air. The area of the vent holes provides the flow cross-sectional area A required for calculating the escape flux.

[0056] On the other hand, the present invention provides an application of the above-mentioned gas escape detection device in the detection of methane escape in oil and gas stations.

[0057] The working principle and use process of the present invention are as follows:

[0058] For local concentration correction, press the adjustment knob 2 on the front panel of the device host 23 to turn off the air pump 12, open the upper ports of the two regulating valves of the upper branch of the sampling accessory 24, close the lower ports of the two regulating valves at both ends of the branch of the sampling accessory 24, and then start the air pump 12 by pressing the adjustment knob 2 on the front panel of the device host 23. After the air pump 12 is started, click the "Start Collection" and "Auto Correction" buttons in the upper host software interface area in sequence, and the device will automatically perform background concentration correction.

[0059] After background concentration correction is complete, the device automatically enters the emission data detection phase. At this point, the upper ports of the two regulating valves on the upper branch of the sampling accessory 24 should be closed, and the lower ports of the two regulating valves on both ends of the sampling accessory 24 branch should be opened. After switching the valves to the emission data detection state, observe the measured concentration change curve over time in the upper host software interface area. Once the measured concentration is relatively stable, the data can be read. The user can read the real-time flow rate of the gas flowing into the device main unit 23, the background concentration, the measured concentration (the measured concentration of the escaped gas), the gas escape rate, the gas escape flux, and the corresponding units in the software interface area.

[0060] In the present invention, the gas is sucked in through the air inlet interface 3 under the action of the air pump 12, and the dust particles are filtered out after the gas passes through the filter 11 to reduce damage to the pipeline system and the laser methane concentration measurement system. Under the action of the air pump 12, the gas reaches the uniform mixing chamber 13, and the escaped methane and air are evenly mixed in the uniform mixing chamber 13 to ensure that the measured concentration conforms to the actual mixing ratio. The gas in the uniform mixing chamber 13 passes through the gas flowmeter 14 and reaches the interior of the long optical path gas pool 15, and then is discharged through the outlet of the long optical path gas pool 15 through the gas outlet, forming a complete gas circuit.

[0061] After being emitted by laser 16, laser light is transmitted via optical fiber 21 into the long optical path gas pool 15. The inner wall of the long optical path gas pool 15 is coated with a high-reflectivity metal film with a reflectivity of 98%. The laser light reflects multiple times from the high-reflectivity gold film on the inner wall of the long optical path gas pool 15, increasing the gas absorption path, and is ultimately emitted from the light outlet of the long optical path gas pool 15. By processing the laser signal before and after gas absorption, information about the gas absorption intensity can be obtained, thereby calculating the concentration of the escaped gas. The laser light is transmitted via optical fiber 21 connected to the outlet of the long optical path gas pool 15 to the input of the photodetector 17. The photodetector 17 receives the optical signal and converts it into an electrical signal. The signal processing module 18 performs data processing to calculate the concentration of the escaped gas. Combined with the dynamic sampling flow control module, the escaped gas and ambient air can be collected from the escape element at a high flow rate. By measuring the sampling flow rate and the concentration of the escaped gas, the gas escape rate and gas escape flux can be calculated.

[0062] Dynamic sampling is widely used to measure gas emission flux. It uses the outside world to continuously purge the dynamic chamber to cover the emission source, and then calculates the flux by measuring the gas concentration at the outlet of the chamber, ensuring the material and energy circulation inside and outside the chamber. When the gas in the dynamic chamber reaches equilibrium, the flux of escaping methane can be calculated according to the following formula:

[0063] Where F is the gas escape flux, g / (m 2 ·s); Q is the gas flow rate, m 3 / s; A is the flow cross-sectional area, m 2 ; M is the molar mass of methane, g / mol; V m is the molar volume of the gas, m 3 / mol;c sample , c back are the volume mixing ratios of the sample gas and background gas concentrations, ppm, respectively.

[0064] The dynamic sampling box used in this device is a sampling accessory 24, which completely covers the methane emission part to be tested. The edge of the sampling accessory 24 and the contact part of the part to be tested are sealed with sealing tape to ensure airtightness during the test process. The vents opened in the sampling accessory 24 ensure the inflow of external air. The area of the vents provides the flow cross-sectional area A data required for the calculation of the emission flux.

[0065] For a dynamic dilution quantification system for methane emissions, the exchange flux of the gas to be measured between the emission source and the sampling point can be determined by the mass balance inside the measurement chamber. Since a relatively stable power source is provided within the methane emission quantification device during the dynamic dilution quantification process, it can be considered that a dynamic equilibrium is formed inside the sampling chamber, and the concentration inside the chamber does not change over time. Therefore, implementing a dynamic dilution quantification method requires adherence to general assumptions and design features: air and methane behave as ideal gases; air and methane are uniformly mixed; methane concentration measurements are accurate; sampling flow measurements are accurate and unaffected by the air / methane mixing ratio; and the methane emission rate is less than or equal to the sampling flow rate. To determine the amount of methane emissions, the sampling airflow rate needs to be obtained. Therefore, a vent is required.

[0066] The gas flow meter 14 is used to measure the gas flow required for feedback gas escape flux calculation. The gas flow meter 14 is installed on the side of the gas pump 12 and parallel to the long optical path gas cell 15.

[0067] The present invention is a portable battery-powered test instrument that can be used to test the gas escape rate under various working conditions, such as oil production machine packing, tank breathing valves, valves, flanges, connectors, open pipelines and other components. It is suitable for typical scenarios such as upstream oil and gas extraction and processing and oil and gas pipeline transportation.

[0068] The above are only preferred embodiments of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A gas escape detection device, characterized in that: It includes sampling accessories, a pneumatic module installed in the main unit of the equipment, and a laser methane detection module; The escaped gas is sucked in from the air inlet interface of the pneumatic module through the sampling accessory, transported to the long optical path gas pool of the pneumatic module after passing through the gas flow meter, and then discharged through the air outlet interface of the pneumatic module; The laser of the laser methane detection module emits laser light, which is transmitted into the long optical path gas pool and then transmitted from the light outlet of the long optical path gas pool to the photoelectric detector of the laser methane detection module. The photoelectric detector receives the light signal and converts it into an electrical signal. The signal processing module of the laser methane detection module processes the data and calculates the concentration of the escaped gas. The gas escape rate and the escape flux are calculated based on the sampling flow rate of the gas flow meter and the concentration of the escaped gas.

2. A gas escape detection device according to claim 1, characterized in that: The pneumatic module further includes a uniform mixing chamber connected between the gas flow meter and the gas inlet interface.

3. A gas escape detection device according to claim 2, characterized in that: The pneumatic module further includes a filter connected between the air inlet interface and the gas flow meter.

4. A gas escape detection device according to claim 3, characterized in that: The pneumatic module further includes an air pump connected between the filter and the uniform mixing chamber.

5. A gas escape detection device according to claim 2, characterized in that: The uniform mixing chamber is composed of a buffer gas cylinder and a porous medium filled therein.

6. A gas escape detection device according to claim 1, characterized in that: The front panel of the device host is provided with an adjusting knob for adjusting the intake air flow rate and a flow adjustment dial for indicating the intake air flow rate.

7. A gas escape detection device according to claim 1, characterized in that: During measurement, the sampling accessory is wrapped around the part to be tested, and the edge of the sampling accessory is sealed in contact with the part to be tested to ensure airtightness during the test process.

8. A gas escape detection device according to claim 1, characterized in that: The inner wall of the long optical path gas pool is plated with a high reflectivity metal film.

9. A gas escape detection device according to any one of claims 1 to 8, characterized in that: The signal processing module includes a harmonic signal processing module, a concentration inversion processing module and a gas escape flux calculation comprehensive processing and transmission module.

10. Application of the gas escape detection device according to any one of claims 1 to 9 in detecting methane escape at an oil and gas station.

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