Device suitable for natural gas sampling detection

Abstract

The invention provides a device suitable for natural gas sampling detection, and relates to the technical field of natural gas detection devices.The device comprises a gas inlet pipe, a gas inlet connector, a first gas conveying pipeline, a sampling detection mechanism, a second gas conveying pipeline, a coarse filter, a gas outlet pipe and a gas outlet connector, and a gas outlet of the gas inlet pipe communicates with a gas inlet of the first gas conveying pipeline through the gas inlet connector; a gas outlet of the first gas pipeline is communicated with the sampling detection mechanism, a gas inlet of the second gas pipeline is communicated with the sampling detection mechanism, a gas outlet of the second gas pipeline is communicated with a gas inlet of the coarse filter, and a gas inlet of the gas outlet pipe is communicated with a gas outlet of the coarse filter through a gas outlet joint. The sampling detection mechanism arranged on the gas pipeline can avoid manual sampling needed in detection, the concentration, pressure and flow of natural gas can be more efficiently and accurately detected in real time, the device can ensure the accuracy and safety of natural gas sampling, and the efficiency of natural gas sampling is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas detection devices, and in particular to a device suitable for natural gas sampling and detection. Background Art

[0002] With the development of gas turbine technology and the changes in the national energy structure, the development of gas turbine power plants has been greatly accelerated, and the requirements for the environment and environmental protection standards have been improved. Natural gas is the main fuel for gas turbine power plants. The natural gas is transported to various gas-using ends. The necessary equipment and devices need to detect the concentration, pressure and flow of natural gas to ensure the normal and stable operation of the gas turbine.

[0003] The existing technology for natural gas sampling and testing requires manual sampling on the natural gas transmission pipeline, which is not only difficult to detect multiple locations of the natural gas transmission pipeline, but also time-consuming and labor-intensive. At the same time, it is also impossible to detect the concentration, pressure, and flow of the natural gas being transported in real time, resulting in low detection efficiency and difficulty in ensuring the personal safety of the sampling personnel. Therefore, it is urgent to design a device suitable for natural gas sampling and testing to solve the above problems. Summary of the invention

[0004] The present invention provides a device suitable for natural gas sampling and detection and a solar power generation system, which are used to solve at least one of the problems raised by the above background technology.

[0005] To solve the above technical problems, the present invention discloses a device suitable for natural gas sampling and detection, comprising: an air inlet pipe, an air inlet joint, a first gas pipeline, a sampling and detection mechanism, a second gas pipeline, a coarse filter, an air outlet pipe and an air outlet joint, the air outlet of the air inlet pipe is connected to the air inlet of the first gas pipeline through the air inlet joint, the air outlet of the first gas pipeline is connected to the sampling and detection mechanism, the air inlet of the second gas pipeline is connected to the sampling and detection mechanism, the air outlet of the second gas pipeline is connected to the air inlet of the coarse filter, and the air inlet of the air outlet pipe is connected to the exhaust port of the coarse filter through the air outlet joint.

[0006] Preferably, an intake valve is fixedly mounted on the intake connector, an intake pressure gauge is fixedly mounted on the first gas pipeline between the intake valve and the sampling and detection mechanism, and an exhaust valve is fixedly mounted on the second gas pipeline between the sampling and detection mechanism and the coarse filter.

[0007] Preferably, the sewage outlet of the coarse filter is connected to a sewage pipe, and a sewage valve is fixedly installed on the sewage pipe, the air outlet valve is fixedly installed on the air outlet joint, and the air outlet of the air outlet pipe is fixedly connected to an air injection nozzle.

[0008] Preferably, the sampling and detection mechanism adapter is connected to the first gas pipeline and the second gas pipeline, and the gas outlet of the adapter is connected to air pipe one, air pipe two and air pipe three in a one-to-one correspondence, and manual isolation valves are fixedly installed on air pipe one, air pipe two and air pipe three, respectively, and the sampling and detection module is connected to air pipe one, air pipe two and air pipe three.

[0009] Preferably, the sampling and detection module comprises:

[0010] A concentration detection unit, wherein the concentration detection unit monitors the concentration of natural gas in real time based on a natural gas gas detector, and the natural gas gas detector can realize real-time monitoring, alarm prompts, data recording, etc.;

[0011] A pressure detection unit, wherein the pressure detection unit monitors the pressure of natural gas in real time based on a pressure sensor or a pressure gauge;

[0012] A flow detection unit, wherein the flow detection unit monitors the flow of natural gas in real time based on a flow meter, wherein the flow meter measures the flow according to the speed at which the fluid passes through the meter or the pressure difference before and after the meter.

[0013] Preferably, the natural gas detector includes a sensor, a circuit board, and a display screen.

[0014] Preferably, it also includes a pipeline performance monitoring device for monitoring the state of the natural gas transmission pipeline in the natural gas sampling and detection device, and the pipeline performance monitoring device includes:

[0015] Densitometer, used to detect the density of natural gas transported in the gas pipeline in the natural gas sampling and testing device;

[0016] Turbine flowmeter, used to detect the flow rate of natural gas transported in the gas pipeline in the natural gas sampling and testing device;

[0017] A speed sensor is used to detect the speed of natural gas transported in a gas pipeline in a natural gas sampling and testing device;

[0018] A controller and an alarm, wherein the controller is electrically connected to the density meter, the turbine flow meter, the speed sensor and the alarm, and the controller controls the alarm to work based on the density meter, the turbine flow meter and the speed sensor.

[0019] Preferably, the controller controls the alarm to work based on the density meter, turbine flow meter and speed sensor, comprising the following steps:

[0020] Step 1: According to formula (1) and the detection values ​​of the density meter, turbine flow meter and speed sensor, calculate the pressure loss ΔP in the gas pipeline during the sampling process of the natural gas sampling detection device:

[0021]

[0022] Wherein, ΔP is the pressure loss in the gas pipeline during the sampling process of the natural gas sampling and detection device, ρ is the detection value of the density of the natural gas transported in the gas pipeline in the natural gas sampling and detection device by the densitometer, q is the detection value of the flow rate of the natural gas transported in the gas pipeline in the natural gas sampling and detection device by the turbine flowmeter, L is the total length of the gas pipeline, V is the detection value of the speed of the natural gas transported in the gas pipeline in the natural gas sampling and detection device by the velocity sensor, g is the acceleration of gravity, D is the inner diameter of the gas pipeline, and μ is the kinematic viscosity of the natural gas transported in the gas pipeline;

[0023] Step 2: According to the following formula (2), the actual maximum tolerable internal pressure P of the gas pipeline during the sampling process of the current natural gas sampling and detection device is calculated. When the controller compares the actual maximum tolerable internal pressure of the gas pipeline during the sampling process of the current natural gas sampling and detection device and finds that it is not within the preset maximum tolerable internal pressure range, the controller controls the alarm to sound an alarm:

[0024]

[0025] Wherein, P is the actual maximum tolerable internal pressure of the gas pipeline during the sampling process of the current natural gas sampling and detection device, t is the wall thickness of the gas pipeline, σ is the tensile strength of the gas pipeline material, and d is the depth of the corrosion defect of the gas pipeline.

[0026] The present invention provides a device suitable for natural gas sampling and detection and a solar power generation system. Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The sampling and detection mechanism in the above-mentioned device suitable for natural gas sampling and detection is achieved by installing a natural gas sampling and detection device on the gas pipeline before the coarse filter of the natural gas entering the pressure regulating station system. Specifically, a natural gas manual isolation valve is installed on the gas pipeline before the coarse filter. This isolation valve is a valve used to isolate the gas pipeline before the coarse filter from the sampling and detection device. Then, a natural gas sampling and detection mechanism is installed above the manual isolation valve. The natural gas sampling and detection mechanism can detect the concentration, pressure and flow of natural gas during natural gas sampling. When it is necessary to conduct regular chemical sampling of natural gas, the concentration, pressure and flow of natural gas can be detected by this device, which can ensure the safety of the samplers and the work efficiency of the samplers.

[0028] 2. The above-mentioned natural gas sampling and testing device has a high degree of automation and can automatically complete the processes of sampling, transmission, analysis and exhaust gas treatment, reducing human intervention and errors; the device has complete safety protection measures, such as explosion-proof, fire-proof, and leak-proof, to ensure that no harm will be caused to personnel and the environment during the sampling and testing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a device suitable for natural gas sampling and detection provided in an embodiment of the present invention.

[0031] Reference numerals:

[0032] 1. Inlet pipe; 2. Inlet joint; 3. First gas pipeline; 4. Sampling and testing mechanism; 5. Second gas pipeline; 6. Coarse filter; 7. Outlet pipe; 8. Outlet joint; 9. Inlet valve; 10. Inlet pressure gauge; 11. Exhaust valve; 12. Drain pipe; 13. Drain valve; 14. Outlet valve; 15. Gas injection nozzle; 16. Adapter; 17. Gas pipe one; 18. Gas pipe two; 19. Gas pipe three; 20. Manual isolation valve. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. 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.

[0034] The present invention provides the following embodiments

[0035] Example 1

[0036] The embodiment of the present invention provides a device suitable for natural gas sampling and detection, such as Figure 1 As shown, it includes: an air inlet pipe 1, an air inlet joint 2, a first air pipeline 3, a sampling and detection mechanism 4, a second air pipeline 5, a coarse filter 6, an air outlet pipe 7 and an air outlet joint 8. The air outlet of the air inlet pipe 1 is connected to the air inlet of the first air pipeline 3 through the air inlet joint 2, the air outlet of the first air pipeline 3 is connected to the sampling and detection mechanism 4, the air inlet of the second air pipeline 5 is connected to the sampling and detection mechanism 4, the air outlet of the second air pipeline 5 is connected to the air inlet of the coarse filter 6, and the air inlet of the air outlet pipe 7 is connected to the exhaust port of the coarse filter 6 through the air outlet joint 8.

[0037] Preferably, an intake valve 9 is fixedly installed on the intake connector 2, an intake pressure gauge 10 is fixedly installed on the first gas pipeline 3 between the intake valve 9 and the sampling and detection mechanism 4, and an exhaust valve 11 is fixedly installed on the second gas pipeline 5 between the sampling and detection mechanism 4 and the coarse filter 6.

[0038] Preferably, the sewage outlet of the coarse filter 6 is connected to a sewage pipe 12, and a sewage valve 13 is fixedly installed on the sewage pipe 12, the air outlet valve 14 is fixedly installed on the air outlet joint 8, and the air outlet of the air outlet pipe 7 is fixedly connected to an air injection nozzle 15.

[0039] The working principle and beneficial effects of the above technical solution are:

[0040] The present invention discloses a device suitable for natural gas sampling and detection, which mainly consists of an air inlet pipe 1, an air inlet joint 2, a first gas pipeline 3, a sampling and detection mechanism 4, a second gas pipeline 5, a coarse filter 6, an air outlet pipe 7 and an air outlet joint 8. When natural gas sampling and detection is required, the natural gas is transported from the air inlet pipe 1. The air inlet valve 9 fixedly installed on the air inlet joint 2 can control the input amount of the natural gas. The air inlet pressure gauge 10 is fixedly installed on the first gas pipeline 3 between the air inlet valve 9 and the sampling and detection mechanism 4, so as to realize real-time monitoring of the pressure in the first gas pipeline 3. After the sampling and detection mechanism 4 completes the detection of the natural gas, the air outlet of the second gas pipeline 5 is connected with the air inlet of the coarse filter 6. The sewage outlet of the coarse filter 6 is connected with a sewage pipe 12 and a sewage valve 13, so as to discharge the waste water generated in the natural gas sampling and detection device. The air outlet of the air outlet pipe 7 is fixedly connected with an air injection nozzle 15, so as to realize the recovery of the natural gas after sampling and detection of the natural gas sampling and detection device.

[0041] The sampling and detection mechanism 4 in the above-mentioned device suitable for natural gas sampling and detection is achieved by installing a natural gas sampling and detection device on the gas pipeline before the coarse filter 6 where the natural gas enters the pressure regulating station system. Specifically, a natural gas manual isolation valve 20 is installed on the gas pipeline before the coarse filter 6. This isolation valve is a valve used to isolate the gas pipeline before the coarse filter 6 from the sampling and detection device. Then, a natural gas sampling and detection mechanism 4 is installed above the manual isolation valve 20. The natural gas sampling and detection mechanism 4 can detect the concentration, pressure and flow of natural gas during natural gas sampling. When it is necessary to conduct regular chemical sampling of natural gas, the concentration, pressure and flow of natural gas can be detected by this device, thereby ensuring the safety of the samplers and the work efficiency of the samplers.

[0042] The above-mentioned natural gas sampling and testing device has a high degree of automation and can automatically complete the processes of sampling, transmission, analysis and exhaust gas treatment, reducing human intervention and errors; the device has complete safety protection measures, such as explosion-proof, fire-proof, and leak-proof, to ensure that no harm is caused to personnel and the environment during the sampling and testing process.

[0043] Example 2

[0044] On the basis of Example 1, the sampling and detection mechanism 4 includes: an adapter 16, the adapter 16 is connected to the first gas pipeline 3 and the second gas pipeline 5, and the gas outlet of the adapter 16 is connected to air pipe 1 17, air pipe 2 18 and air pipe 3 19 in a one-to-one correspondence, and manual isolation valves 20 are fixedly installed on air pipe 1 17, air pipe 2 18 and air pipe 3 19 respectively, and the sampling and detection module is connected to air pipe 1 17, air pipe 2 18 and air pipe 3 19.

[0045] Preferably, the sampling and detection module comprises:

[0046] A concentration detection unit, wherein the concentration detection unit monitors the concentration of natural gas in real time based on a natural gas gas detector, and the natural gas gas detector can realize real-time monitoring, alarm prompts, data recording, etc.;

[0047] A pressure detection unit, wherein the pressure detection unit monitors the pressure of natural gas in real time based on a pressure sensor or a pressure gauge;

[0048] A flow detection unit, wherein the flow detection unit monitors the flow of natural gas in real time based on a flow meter, wherein the flow meter measures the flow according to the speed at which the fluid passes through the meter or the pressure difference before and after the meter.

[0049] Preferably, the natural gas detector includes a sensor, a circuit board, and a display screen.

[0050] The working principle and beneficial effects of the above technical solution are:

[0051] The above-mentioned sampling and detection mechanism 4 is arranged on the first gas pipeline 3 and the second gas pipeline 5. When detection is required, the natural gas is transported to the sampling and detection module through the gas pipe 1 17, the gas pipe 2 18 and the gas pipe 3 19 which are connected one by one to the gas outlet of the adapter 16. Then, the concentration, pressure and flow of the natural gas are respectively measured through the sampling and detection module. Manual isolation valves 20 are fixedly installed on the gas pipe 1 17, the gas pipe 2 18 and the gas pipe 3 19 respectively. The manual isolation valves 20 arranged on the gas pipe 1 17, the gas pipe 2 18 and the gas pipe 3 19 can accurately control the natural gas to enter the sampling and detection module for corresponding detection, thereby improving the accuracy and reliability of natural gas detection and making the manually operated natural gas sampling and detection device safer.

[0052] The sampling and detection module provided by the sampling and detection mechanism 4 includes a concentration detection unit, which monitors the concentration of natural gas in real time based on a natural gas gas detector. The natural gas gas detector is composed of a sensor, a circuit board, a display screen, etc., and can monitor the concentration of natural gas in real time and display the concentration value on the display screen. When the concentration exceeds the safe range, the detector will sound an alarm or light a prompt to remind people to take corresponding measures. The natural gas gas detector has multiple functions, such as real-time monitoring, alarm prompts, data recording, etc., and can be installed on natural gas pipelines or equipment to monitor gas concentration and ensure the safety of the production process; a pressure detection unit, which is based on a pressure sensor or a pressure gauge Real-time monitoring of natural gas pressure. The pressure sensor can convert the pressure into an electrical signal and display or record the pressure value through a display or recorder; the pressure gauge directly displays the pressure value. In order to ensure accurate monitoring of the natural gas pressure, it is necessary to install appropriate pressure sensors or pressure gauges, and calibrate and maintain them regularly; the flow detection unit, the flow detection unit is based on a flow meter to monitor the flow of natural gas in real time. Common flow meters include turbine flow meters, ultrasonic flow meters, vortex flow meters, and electromagnetic flow meters. These flow meters can measure the flow rate based on the speed at which the fluid passes through the meter or the pressure difference before and after the meter. In order to ensure accurate measurement of the natural gas flow rate, it is necessary to install appropriate flow meters, calibrate and maintain them regularly.

[0053] Example 3

[0054] The device for natural gas sampling and detection described in Example 1 or 2 further includes a pipeline performance monitoring device for monitoring the state of the natural gas transmission pipeline in the natural gas sampling and detection device, and the pipeline performance monitoring device includes:

[0055] Densitometer, used to detect the density of natural gas transported in the gas pipeline in the natural gas sampling and testing device;

[0056] Turbine flowmeter, used to detect the flow rate of natural gas transported in the gas pipeline in the natural gas sampling and testing device;

[0057] A speed sensor is used to detect the speed of natural gas transported in a gas pipeline in a natural gas sampling and testing device;

[0058] A controller and an alarm, wherein the controller is electrically connected to the density meter, the turbine flow meter, the speed sensor and the alarm, and the controller controls the alarm to work based on the density meter, the turbine flow meter and the speed sensor.

[0059] Optionally, the natural gas transmission pipeline is the first gas transmission pipeline 3 or the second gas transmission pipeline 5 .

[0060] Preferably, the controller controls the alarm to work based on the density meter, turbine flow meter and speed sensor, comprising the following steps:

[0061] Step 1: According to formula (1) and the detection values ​​of the density meter, turbine flow meter and speed sensor, calculate the pressure loss ΔP in the gas pipeline during the sampling process of the natural gas sampling detection device:

[0062]

[0063] Wherein, ΔP is the pressure loss in the gas pipeline during the sampling process of the natural gas sampling and detection device, ρ is the detection value of the density of the natural gas transported in the gas pipeline in the natural gas sampling and detection device by the densitometer, q is the detection value of the flow rate of the natural gas transported in the gas pipeline in the natural gas sampling and detection device by the turbine flowmeter, L is the total length of the gas pipeline, V is the detection value of the speed of the natural gas transported in the gas pipeline in the natural gas sampling and detection device by the velocity sensor, g is the acceleration of gravity, D is the inner diameter of the gas pipeline, and μ is the kinematic viscosity of the natural gas transported in the gas pipeline;

[0064] Step 2: According to the following formula (2), the actual maximum tolerable internal pressure P of the gas pipeline during the sampling process of the current natural gas sampling and detection device is calculated. When the controller compares the actual maximum tolerable internal pressure of the gas pipeline during the sampling process of the current natural gas sampling and detection device and finds that it is not within the preset maximum tolerable internal pressure range, the controller controls the alarm to sound an alarm:

[0065]

[0066] Among them, P is the actual maximum tolerable internal pressure of the gas pipeline during the sampling process of the current natural gas sampling and detection device, t is the wall thickness of the gas pipeline, σ is the tensile strength of the gas pipeline material, and d is the depth of the corrosion defect of the gas pipeline (obtained by looking up the table based on the service life of the gas pipeline).

[0067] The beneficial effects of the above technical solution are as follows: first, according to formula (1) and the detection values ​​of the density meter, turbine flowmeter and speed sensor, the pressure loss in the gas pipeline of the natural gas sampling and detection device during the detection and sampling process is calculated, and by comprehensively considering the density of the natural gas transported in the gas pipeline of the natural gas sampling and detection device, the flow rate of the natural gas transported in the gas pipeline of the natural gas sampling and detection device, the total length of the gas pipeline, the speed of the natural gas transported in the gas pipeline of the natural gas sampling and detection device, the inner diameter of the gas pipeline, and the kinematic viscosity of the natural gas transported in the gas pipeline, the calculation result is more accurate and reliable;

[0068] Then, according to formula (2), the actual maximum tolerable internal pressure of the gas pipeline during the sampling process of the current natural gas sampling and detection device is calculated, and the wall thickness of the gas pipeline, the tensile strength of the gas pipeline material, and the depth of the corrosion defect of the gas pipeline are comprehensively considered, so that the calculation result is more accurate and reliable;

[0069] The controller controls the alarm based on the density meter, turbine flowmeter and speed sensor. If the actual maximum tolerable internal pressure of the gas pipeline during the sampling process of the current natural gas sampling and detection device is not within the preset output power range, the controller controls the alarm to sound an alarm, thereby reminding the staff to inspect the gas pipeline in time, and perform maintenance on the gas pipeline according to the actual inspection results to maintain the use requirements of the natural gas sampling and detection device, while ensuring the normal operation of the gas pipeline in the natural gas sampling and detection device and the reliability of the sampling, and effectively improving the service life of the natural gas sampling and detection device, further meeting the use requirements of the natural gas sampling and detection device for operational reliability and stability, and through real-time sampling efficiency of the gas pipeline in the natural gas sampling and detection device, it also ensures that the natural gas sampling and detection device can quickly discover and complete maintenance in time after a failure occurs.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device suitable for natural gas sampling and detection, characterized in that: include: An air inlet pipe (1), an air inlet connector (2), a first air pipeline (3), a sampling detection mechanism (4), a second air pipeline (5), a coarse filter (6), an air outlet pipe (7) and an air outlet connector (8); the air outlet of the air inlet pipe (1) is connected to the air inlet of the first air pipeline (3) via the air inlet connector (2); the air outlet of the first air pipeline (3) is connected to the sampling detection mechanism (4); the air inlet of the second air pipeline (5) is connected to the sampling detection mechanism (4); the air outlet of the second air pipeline (5) is connected to the air inlet of the coarse filter (6); the air inlet of the air outlet pipe (7) is connected to the air outlet of the coarse filter (6) via the air outlet connector (8).

2. A device suitable for natural gas sampling and detection according to claim 1, characterized in that: An intake valve (9) is fixedly mounted on the intake joint (2), an intake pressure gauge (10) is fixedly mounted on the first gas pipeline (3) between the intake valve (9) and the sampling and detection mechanism (4), and an exhaust valve (11) is fixedly mounted on the second gas pipeline (5) between the sampling and detection mechanism (4) and the coarse filter (6).

3. A device suitable for natural gas sampling and detection according to claim 1, characterized in that: The sewage outlet of the coarse filter (6) is connected to a sewage outlet pipe (12), and a sewage outlet valve (13) is fixedly installed on the sewage outlet pipe (12); the air outlet valve (14) is fixedly installed on the air outlet joint (8), and the air outlet of the air outlet pipe (7) is fixedly connected to an air injection nozzle (15).

4. A device suitable for natural gas sampling and detection according to claim 1, characterized in that: The sampling detection mechanism (4) comprises an adapter (16), the adapter (16) being in communication with the first gas pipeline (3) and the second gas pipeline (5), and the gas outlet of the adapter (16) being connected to a gas pipe (17), a gas pipe (18) and a gas pipe (19) in a one-to-one correspondence, and a manual isolation valve (20) being fixedly mounted on each of the gas pipes (17), the gas pipes (18) and the gas pipes (19), respectively, and the sampling detection module being in communication with the gas pipes (17), the gas pipes (18) and the gas pipes (19).

5. A device suitable for natural gas sampling and detection according to claim 4, characterized in that: The sampling and detection module comprises: A concentration detection unit, wherein the concentration detection unit monitors the concentration of natural gas in real time based on a natural gas gas detector, and the natural gas gas detector can realize real-time monitoring, alarm prompts, data recording, etc.; A pressure detection unit, wherein the pressure detection unit monitors the pressure of natural gas in real time based on a pressure sensor or a pressure gauge; A flow detection unit, wherein the flow detection unit monitors the flow of natural gas in real time based on a flow meter, wherein the flow meter measures the flow according to the speed at which the fluid passes through the meter or the pressure difference before and after the meter.

6. A device suitable for natural gas sampling and detection according to claim 5, characterized in that: The natural gas detector comprises a sensor, a circuit board and a display screen.

7. A device suitable for natural gas sampling and detection according to claim 5, characterized in that: It also includes pipeline performance monitoring equipment, which is used to monitor the status of the natural gas transmission pipeline in the natural gas sampling and detection device, and the pipeline performance monitoring equipment includes: Densitometer, used to detect the density of natural gas transported in the gas pipeline in the natural gas sampling and testing device; Turbine flowmeter, used to detect the flow rate of natural gas transported in the gas pipeline in the natural gas sampling and testing device; A speed sensor is used to detect the speed of natural gas transported in a gas pipeline in a natural gas sampling and testing device; A controller and an alarm, wherein the controller is electrically connected to the density meter, the turbine flow meter, the speed sensor and the alarm, and the controller controls the alarm to work based on the density meter, the turbine flow meter and the speed sensor.

8. A device suitable for natural gas sampling and detection according to claim 7, characterized in that: The controller controls the alarm to work based on the density meter, turbine flow meter and speed sensor, including the following steps: Step 1: According to formula (1) and the detection values ​​of the density meter, turbine flow meter and speed sensor, calculate the pressure loss ΔP in the gas pipeline during the sampling process of the natural gas sampling detection device: Wherein, ΔP is the pressure loss in the gas pipeline during the sampling process of the natural gas sampling and detection device, ρ is the detection value of the density of the natural gas transported in the gas pipeline in the natural gas sampling and detection device by the densitometer, q is the detection value of the flow rate of the natural gas transported in the gas pipeline in the natural gas sampling and detection device by the turbine flowmeter, L is the total length of the gas pipeline, V is the detection value of the speed of the natural gas transported in the gas pipeline in the natural gas sampling and detection device by the velocity sensor, g is the acceleration of gravity, D is the inner diameter of the gas pipeline, and μ is the kinematic viscosity of the natural gas transported in the gas pipeline; Step 2: According to the following formula (2), the actual maximum tolerable internal pressure P of the gas pipeline during the sampling process of the current natural gas sampling and detection device is calculated. When the controller compares the actual maximum tolerable internal pressure of the gas pipeline during the sampling process of the current natural gas sampling and detection device and finds that it is not within the preset maximum tolerable internal pressure range, the controller controls the alarm to sound an alarm: Wherein, P is the actual maximum tolerable internal pressure of the gas pipeline during the sampling process of the current natural gas sampling and detection device, t is the wall thickness of the gas pipeline, σ is the tensile strength of the gas pipeline material, and d is the depth of the corrosion defect of the gas pipeline.

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