An LNG online sampling, detection and analysis system

Abstract

The present invention discloses an LNG online sampling, detection and analysis system, which specifically relates to the field of gas sampling and detection technology, including a protective bottom shell, a sampling and analysis tank, a nitrogen sensor, a humidity sensor and a sampling and detection protection component; wherein the sampling and detection protection component includes a support frame, a reduction motor and a screw, wherein a displacement sampling safety detection component and an L-shaped safety covering component. The present invention has the advantages of being able to perform closed and sealed protection between the protective top shell and the protective bottom shell according to a specified pressure through the sampling and detection protection component, being able to safely handle the leaked liquefied natural gas in time, and greatly improving the safety of liquefied natural gas sampling and detection, thereby solving the problem of difficulty in timely knowing the leakage of liquefied natural gas during the sampling and detection process, and difficulty in timely and safely handling the leaked liquefied natural gas, which leads to the problem of poor safety of liquefied natural gas sampling, detection and analysis.

Description

Technical Field

[0001] The present invention relates to the technical field of gas sampling and detection, and more specifically, to an LNG online sampling, detection and analysis system. Background Art

[0002] LNG (liquefied natural gas) online sampling and humidity detection nitrogen analysis system is of great use in many aspects. It has the function of humidity monitoring. Mainly by detecting the moisture content in LNG, the system can timely discover and warn potential moisture exceeding the standard, and prevent safety hazards such as equipment corrosion and pipeline blockage caused by excessive moisture. Secondly, nitrogen analysis. As one of the common impurities in LNG, the content of nitrogen has an important influence on the calorific value and combustion performance of LNG.

[0003] After searching the existing public documents, the Chinese patent announcement number CN106802344A discloses a continuous sampling and analysis device for LNG loading and unloading and a method of use. The sampling, detection and analysis are connected to the online analysis device and the flow control device through the outlet of the gasification device and the sampling main pipeline respectively. The flow control device is also connected to the inlet of the sample gas storage device. The outlet of the sample gas storage device is connected to the sample cylinder filling system, and the sample cylinder filling system is also connected to the BOG main pipe; the isolation shut-off valve, temperature detection element, sampling main pipeline, flow control device, sample gas storage device and sample cylinder filling system are electrically connected to the control system respectively. The invention can be widely used in facilities for analyzing LNG components and calculating LNG calorific value. However, the technology still has the following defects.

[0004] During the online sampling, testing and analysis of liquefied natural gas, it is necessary to sample a portion of the liquefied natural gas from the liquefied natural gas pipeline so as to perform online testing and analysis of the liquefied natural gas. There will be a lot of liquefied natural gas inside the sampling pipeline. During the sampling and testing process, the liquefied natural gas will leak due to loose connection positions, which will cause safety hazards during the sampling and testing of the liquefied natural gas. It is difficult to promptly know the liquefied natural gas leakage during the sampling and testing process, and it is difficult to promptly handle the leaked liquefied natural gas safely, which leads to poor safety in liquefied natural gas sampling, testing and analysis. For this purpose, an LNG online sampling, testing and analysis system is provided. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides the following technical solutions: an LNG online sampling, detection and analysis system, comprising a protective bottom shell, a sampling and analysis tank and a nitrogen sensor, wherein the sampling and analysis tank is installed inside the protective bottom shell, the nitrogen sensor is installed inside the sampling and analysis tank, a humidity sensor is provided on one side of the nitrogen sensor, and a sampling and detection protection component is provided on one side of the protective bottom shell; the sampling and detection protection component comprises a support frame fixedly arranged on one side of the protective bottom shell, and a reduction motor is fixedly installed on the bottom end of the inner wall of the support frame, a screw is fixedly connected to the output end of the reduction motor, a socket plate is threadedly connected to the outer wall of the screw, the socket plate is slidably connected to the support frame, and a torque sensor is fixedly installed on the top of the screw, and the torque sensor is fixedly connected to the support frame; a protective top shell is fixedly installed on one side of the socket plate, and the protective top shell is slidably connected to the support frame; a displacement sampling safety detection component is provided on one side of the outer wall of the sampling and analysis tank; an L-shaped safety covering component is provided on the upper surface of the protective top shell.

[0006] Preferably, the reduction motor is used to drive the screw to rotate, and the outer wall of the socket plate and the inner wall of the support frame are both smooth surfaces. A socket block is fixedly connected to one side of the protective top shell, and the inner wall of the socket block is slidably connected to a guide rod; a support block is fixedly installed at the bottom end of the guide rod, and the support block is fixedly connected to the protective bottom shell. The top of the nitrogen sensor is fixedly connected to a support, and the sampling and analysis tank and the humidity sensor are both fixedly connected to the support. The bottom end of the sampling and analysis tank is fixedly connected to a lower row valve, and the other side of the outer wall of the sampling and analysis tank is fixedly connected to a sampling valve; one end of the sampling valve is threadedly connected to a sampling tube, and one end of the sampling tube is fixedly connected to a sampling cut-off valve, and one end of the sampling cut-off valve is fixedly connected to a liquefied natural gas delivery pipe; the sampling cut-off valve is fixedly connected to the protective bottom shell.

[0007] When this technology is in use, the reduction motor drives the screw to rotate, and the screw drives the socket plate to move downward under the action of the thread transmission force, and the protective top shell drives the socket block to move downward, while the protective bottom shell supports the support block to increase the stability of the guide rod, so that the protective top shell can be squeezed on the upper surface of the protective bottom shell, thereby achieving extrusion closure between the protective bottom shell and the sampling and analysis tank. To prevent liquefied natural gas from leaking out, when the torque value sensed by the torque sensor is the same as the torque value set by the wireless controller, the reduction motor is turned off through the wireless controller.

[0008] Preferably, the displacement sampling safety detection component includes an L-shaped frame fixedly mounted on one side of the outer wall of the sampling and analysis tank; one side of the L-shaped frame is fixedly connected to a support frame, the inner wall of the support frame is rotatably connected to a linkage screw, the outer wall of the linkage screw is threadedly connected to a threaded sleeve block, and one side of the inner wall of the support frame is fixedly mounted with a transmission motor, and the transmission motor is used to drive the linkage screw to rotate; two connecting shafts are fixedly connected to the upper surface of the threaded sleeve block, the outer wall of each of the connecting shafts is rotatably connected to a sleeve rod, and the inner wall of the sleeve rod is rotatably connected to an articulated shaft at a position away from the connecting shaft; a sleeve slider is fixedly mounted on the bottom end of the articulated shaft, and a sleeve strip is fixedly connected to one side of the sleeve slider.

[0009] A liquefied natural gas concentration sensor is fixedly installed on the inner wall of the sleeve strip, and a sliding rod is slidably connected to the inner wall of each sleeve slider, and both sliding rods are fixedly connected to the L-shaped frame; a distance sensor is fixedly connected to the upper surface of the L-shaped frame and away from the sleeve slider, and the distance sensor is used to sense the movement distance of the sleeve slider. The threaded sleeve block is slidably connected to the support frame, and the output end of the transmission motor is fixedly connected to the linkage screw. The sleeve slider is slidably connected to the L-shaped frame, and the inner wall of the L-shaped frame and the outer wall of the sleeve slider are both smooth surfaces.

[0010] When this technology is used, while conducting online detection and analysis of liquefied natural gas, the transmission motor drives the linkage screw to rotate forward, the linkage screw drives the threaded sleeve to move backward under the action of the thread, the threaded sleeve drives the two connecting shafts to move backward, the sleeve rod drives the hinged shaft to move tilted to the left, and the other hinged shaft moves tilted to the right. The sleeve slider moves tilted to the left along the outer wall of the slide rod, the sleeve strip enables the liquefied natural gas concentration sensor to move tilted to the left, and the other liquefied natural gas concentration sensor can move tilted to the right. In this way, the liquefied natural gas concentration sensor can detect the liquefied natural gas concentration along the sampling tube and above the sampling shut-off valve, and the other liquefied natural gas concentration sensor can detect the liquefied natural gas concentration on the sampling tube, sampling valve and sampling analysis tank. Knowing that there is a leakage problem of liquefied natural gas, the reduction motor is immediately started through the wireless controller.

[0011] Preferably, the L-shaped safety covering assembly comprises a liquid tank body fixedly arranged on the upper surface of the protective top shell; the inner wall of the liquid tank body is fixedly connected with a delivery hose, a delivery pump is fixedly installed on the top of the delivery hose, and a boosting pipe is fixedly connected to the output end of the delivery pump, and the boosting pipe is fixedly connected to the protective top shell; the bottom end of the boosting pipe is fixedly connected with an L-shaped nozzle, and a circular nozzle is fixedly connected to one end of the L-shaped nozzle;

[0012] A battery is fixedly connected to the outer wall of the protective bottom shell and located at a position adjacent to one side of the support frame, a wireless controller is fixedly installed on one side of the battery, and the wireless controller is fixedly connected to the protective bottom shell. The cross-sectional shape of the L-shaped nozzle is L-shaped, and the cross-sectional shape of the annular nozzle is annular.

[0013] When this technology is used, the delivery pump generates suction force on the delivery hose, which pressurizes and absorbs the water inside the liquid tank, which is then poured into the L-shaped nozzle by the pressurizing pipe, and then sprayed downward in an L shape through the L-shaped nozzle. After the water sprays downward, it can spray and cool the sampling cut-off valve, sampling tube and sampling valve position, and the annular nozzle can spray and cool the top of the sampling analysis tank in an annular shape.

[0014] Technical effects and advantages of the present invention:

[0015] 1. The present invention detects the protection component through sampling. When the concentration of liquefied natural gas detected by sampling is detected, it is known that the liquefied natural gas detected by sampling has a leakage problem. The reduction motor drives the screw to rotate. The screw drives the socket plate to move downward under the action of the thread transmission force. The socket plate drives the protective top shell to move downward. The protective top shell drives the socket block to move downward. The socket block slides down along the outer wall guide of the guide rod. At the same time, the protective bottom shell supports the support block. When the torque value sensed by the torque sensor is the same as the torque value set by the wireless controller, the reduction motor is turned off by the wireless controller. In this way, the protective top shell and the protective bottom shell can be closed and protected according to the specified pressure. The leakage of liquefied natural gas in the sampling and detection process can be known in time, and the leaked liquefied natural gas can be safely handled in time, which greatly improves the safety of liquefied natural gas sampling and detection.

[0016] 2. The present invention uses a displacement sampling safety detection component to start the transmission motor through a wireless controller while performing online detection and analysis of liquefied natural gas. The linkage screw drives the threaded sleeve block to move backward under the action of the thread, and the threaded sleeve block drives the two connecting shafts to move backward. The sleeve rod drives the hinged shaft to move obliquely to the left, and at the same time, the other hinged shaft moves obliquely to the right. The sleeve slider moves obliquely to the left along the outer wall of the slide rod. The sleeve strip enables the liquefied natural gas concentration sensor to move obliquely to the left, and at the same time, the other liquefied natural gas concentration sensor can move obliquely to the right. When the liquefied natural gas concentration is detected, the problem of liquefied natural gas leakage in the sampling and detection process can be known in time, and the leaked liquefied natural gas can be safely handled in time, thereby greatly improving the safety of liquefied natural gas sampling and detection.

[0017] 3. The present invention adopts an L-shaped safety covering component. The delivery pump enables the delivery hose to generate suction. The delivery hose pressurizes and absorbs the water inside the liquid tank, and the water is poured into the L-shaped nozzle through the booster pipe. The L-shaped downward spray is realized through the L-shaped nozzle. After the water is sprayed downward, the sampling cut-off valve, the sampling tube and the sampling valve position can be sprayed to cool down. The annular nozzle can realize circular spraying and cooling on the top of the sampling analysis tank, so as to avoid the combustion and explosion of liquefied natural gas during the sampling and detection process, and greatly improve the safety of liquefied natural gas sampling and detection.

[0018] According to the mutual influence of the above-mentioned multiple effects, the sleeve first makes the liquefied natural gas concentration sensor tilt to the left, and at the same time, another liquefied natural gas concentration sensor can tilt to the right, so that the liquefied natural gas leakage problem in the sampling and detection process can be timely known, and then the protective top shell and the protective bottom shell can be closed and protected according to the specified pressure. Finally, after the water body is sprayed downward, the sampling cut-off valve, sampling tube and sampling valve position can be sprayed and cooled, and the annular nozzle can realize circular spraying and cooling on the top of the sampling analysis tank. In summary, the liquefied natural gas leakage problem in the sampling and detection process can be known in time, and the leaked liquefied natural gas can be safely handled in time, greatly improving the safety of liquefied natural gas sampling and detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the LNG online sampling, detection and analysis system of the present invention.

[0020] Figure 2 It is a schematic diagram of the local structure of the vertical section of the connection between the support and the sampling and analysis tank of the present invention.

[0021] Figure 3 It is a schematic diagram of the partial structure of the connection between the protective bottom shell and the supporting frame of the present invention.

[0022] Figure 4 It is a side structural schematic diagram of the LNG online sampling, detection and analysis system of the present invention.

[0023] Figure 5 It is a schematic diagram of the cross-section structure of the LNG online sampling, detection and analysis system of the present invention when viewed from above.

[0024] Figure 6 It is a schematic diagram of the partial structure of the connection between the support frame and the transmission motor of the present invention.

[0025] Figure 7 It is a schematic diagram of the partial structure of the connection between the sleeve rod and the hinge shaft of the present invention.

[0026] Figure 8 It is a schematic diagram of the partial structure of the connection between the protective top shell and the liquid tank body of the present invention.

[0027] Fig. 9 It is a schematic diagram of the partial structure of the connection between the protective top shell and the boost pipe of the present invention when viewed from above.

[0028] Fig.10 It is a schematic diagram of a partial structure of an L-shaped safety covering component of the present invention when viewed from above.

[0029] The accompanying drawings are marked as follows: 1, protective bottom shell; 2, sampling and analysis tank; 3, nitrogen sensor; 4, humidity sensor; 5, support frame; 6, reduction motor; 7, screw; 8, socket plate; 9, torque sensor; 10, protective top shell; 11, socket block; 12, guide rod; 13, support block; 14, support; 15, lower row valve; 16, sampling valve; 17, sampling tube; 18, sampling shut-off valve; 19, liquefied natural gas transmission pipe; 20, L-shaped frame; 21. Support frame; 22. Linked screw; 23. Threaded sleeve block; 24. Transmission motor; 25. Connecting shaft; 26. Sleeve rod; 27. Articulated shaft; 28. Sleeve slider; 29. ​​Sleeve strip; 30. Liquefied natural gas concentration sensor; 31. Slide rod; 32. Distance sensor; 33. Liquid tank; 34. Delivery hose; 35. Delivery pump; 36. Booster pipe; 37. L-shaped nozzle; 38. Circular nozzle; 39. Wireless controller; 40. Battery. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0031] As attached Figure 1 - Attachment Fig.10 An LNG online sampling, detection and analysis system is shown, which is provided with a sampling detection protection component, a displacement sampling safety detection component and an L-shaped safety covering component. The setting of each component can timely know the liquefied natural gas leakage problem during the sampling and detection process, and can safely handle the leaked liquefied natural gas in time, thereby greatly improving the safety of liquefied natural gas sampling and detection. The specific structural settings of each component are as follows.

[0032] In this embodiment, as shown in the attached Figure 1-3 As shown, it includes a protective bottom shell 1, a sampling and analysis tank 2 and a nitrogen sensor 3. The sampling and analysis tank 2 is installed inside the protective bottom shell 1, the nitrogen sensor 3 is installed inside the sampling and analysis tank 2, a humidity sensor 4 is provided on one side of the nitrogen sensor 3, and a sampling detection protection component is provided on one side of the protective bottom shell 1.

[0033] The sampling detection protection component includes a support frame 5 fixedly arranged on one side of the protection bottom shell 1, and a reduction motor 6 is fixedly installed on the bottom end of the inner wall of the support frame 5, a screw 7 is fixedly connected to the output end of the reduction motor 6, and a socket plate 8 is threadedly connected to the outer wall of the screw 7, and the socket plate 8 and the support frame 5 are slidably connected, and a torque sensor 9 is fixedly installed on the top of the screw 7, and the torque sensor 9 is fixedly connected to the support frame 5; a protection top shell 10 is fixedly installed on one side of the socket plate 8, and the protection top shell 10 and the support frame 5 are slidably connected; a displacement sampling safety detection component is provided on one side of the outer wall of the sampling and analysis tank 2; and an L-shaped safety covering component is provided on the upper surface of the protection top shell 10.

[0034] In this embodiment, as shown in the attached Figure 1 - Attachment Figure 4 As shown, a sleeve block 11 is fixedly connected to one side of the protective top shell 10, and a guide rod 12 is slidably connected to the inner wall of the sleeve block 11; a support block 13 is fixedly installed at the bottom end of the guide rod 12, and the support block 13 is fixedly connected to the protective bottom shell 1, so that the protective top shell 10 drives the sleeve block 11 to move downward, and the sleeve block 11 slides down along the outer wall of the guide rod 12, and the protective bottom shell 1 supports the support block 13, and the support block 13 supports the guide rod 12, so that the protective top shell 10 can be guided to close contact with the protective bottom shell 1. The top of the nitrogen sensor 3 is fixedly connected to a support 14, and the sampling and analysis tank 2 and the humidity sensor 4 are both fixedly connected to the support 14, so that the support 14 is supported by the sampling and analysis tank 2, and the support 14 supports the nitrogen sensor 3, and the support 14 can also support the humidity sensor 4, thereby increasing the stability of the humidity sensor 4 and the nitrogen sensor 3.

[0035] In this embodiment, as shown in the attached Figure 2 - Attachment Figure 5 As shown, the bottom end of the sampling and analysis tank 2 is fixedly connected with a lower row valve 15, and the other side of the outer wall of the sampling and analysis tank 2 is fixedly connected with a sampling valve 16; one end of the sampling valve 16 is threadedly connected with a sampling tube 17, and one end of the sampling tube 17 is fixedly connected with a sampling cut-off valve 18, and one end of the sampling cut-off valve 18 is fixedly connected with a liquefied natural gas delivery pipe 19; the sampling cut-off valve 18 is fixedly connected with the protective bottom shell 1, so that one end of the liquefied natural gas delivery pipe 19 can be connected to the liquefied natural gas pipeline, and the liquefied natural gas can be delivered to the liquefied natural gas pipeline. The other end of the natural gas transmission pipe 19 is also connected to another liquefied natural gas pipeline, and the sampling valve 16 is closed. At the same time, the wireless controller 39 opens the sampling shut-off valve 18, and the liquefied natural gas inside the liquefied natural gas transmission pipe 19 enters the sampling tube 17 along the sampling shut-off valve 18. After a portion of the liquefied natural gas can be sampled from the sampling tube 17, the sampling valve 16 is opened, so that the sampled liquefied natural gas enters the sampling analysis tank 2 through the sampling valve 16 for storage, and then the lower row valve 15 is closed.

[0036] In this embodiment, as shown in the attached Figure 5 - Attachment Figure 7 As shown, the displacement sampling safety detection component includes an L-shaped frame 20 fixedly mounted on one side of the outer wall of the sampling and analysis tank 2; one side of the L-shaped frame 20 is fixedly connected to a support frame 21, the inner wall of the support frame 21 is rotatably connected to a linkage screw 22, the outer wall of the linkage screw 22 is threadedly connected to a threaded sleeve block 23, and one side of the inner wall of the support frame 21 is fixedly mounted with a transmission motor 24, which is used to drive the linkage screw 22 to rotate.

[0037] Two connecting shafts 25 are fixedly connected to the upper surface of the threaded sleeve block 23, and the outer wall of each connecting shaft 25 is rotatably connected to a sleeve rod 26, and the inner wall of the sleeve rod 26 is rotatably connected to a hinge shaft 27 at a position away from the connecting shaft 25; a sleeve slider 28 is fixedly installed at the bottom end of the hinge shaft 27, and a sleeve strip 29 is fixedly connected to one side of the sleeve slider 28, and a liquefied natural gas concentration sensor 30 is fixedly installed on the inner wall of the sleeve strip 29, and a slide rod 31 is slidably connected to the inner wall of each sleeve slider 28, and both slide rods 31 are fixedly connected to the L-shaped frame 20; a distance sensor 32 is fixedly connected to the upper surface of the L-shaped frame 20 at a position away from the sleeve slider 28, and the distance sensor 32 is used to sense the moving distance of the sleeve slider 28. The threaded sleeve block 23 is slidably connected to the support frame 21, and the output end of the transmission motor 24 is fixedly connected to the linkage screw 22. The sleeve sliding block 28 is slidably connected to the L-shaped frame 20 , and the inner wall of the L-shaped frame 20 and the outer wall of the sleeve sliding block 28 are both smooth surfaces.

[0038] In this embodiment, as shown in the attached Figure 8-10 As shown, the L-shaped safety cover assembly includes a liquid tank 33 fixedly arranged on the upper surface of the protective top shell 10; the inner wall of the liquid tank 33 is fixedly connected with a delivery hose 34, the top of the delivery hose 34 is fixedly installed with a delivery pump 35, and the output end of the delivery pump 35 is fixedly connected with a booster pipe 36, and the booster pipe 36 is fixedly connected to the protective top shell 10; the bottom end of the booster pipe 36 is fixedly connected with an L-shaped nozzle 37, and one end of the L-shaped nozzle 37 is fixedly connected with a circular nozzle 38; the outer wall of the protective bottom shell 1 and located at a position adjacent to the support frame 5 is fixedly connected with a battery 40, and a wireless controller 39 is fixedly installed on one side of the battery 40, and the wireless controller 39 is fixedly connected to the protective bottom shell 1. The cross-sectional shape of the L-shaped nozzle 37 is L-shaped, and the cross-sectional shape of the circular nozzle 38 is circular.

[0039] The working principle of the LNG online sampling, detection and analysis system of the present invention is as follows:

[0040] Step 1: During the online sampling, testing and analysis of liquefied natural gas, firstly, one end of the liquefied natural gas delivery pipe 19 is docked on the liquefied natural gas pipeline, and the other end of the liquefied natural gas delivery pipe 19 is also docked on another liquefied natural gas pipeline, so that the liquefied natural gas delivery pipe 19 can normally transport liquefied natural gas. The wireless controller 39 is powered by the battery 40, and the wireless controller 39 closes the sampling valve 16, and at the same time, the wireless controller 39 opens the sampling shut-off valve 18, so that the liquefied natural gas in the liquefied natural gas delivery pipe 19 enters the sampling pipe 17 along the sampling shut-off valve 18.

[0041] The sampling shutoff valve 18 is closed by the wireless controller 39, and a portion of the liquefied natural gas can be sampled from the inside of the sampling tube 17, and then the sampling valve 16 is opened, so that the sampled liquefied natural gas enters the sampling and analysis tank 2 through the sampling valve 16 for storage, and then the lower row valve 15 is closed. The support 14 is supported by the sampling and analysis tank 2, and the support 14 supports the nitrogen sensor 3. At the same time, the support 14 can also support the humidity sensor 4, so that the humidity sensor 4 can detect and analyze the humidity value of the sampled liquefied natural gas, and the nitrogen sensor 3 can detect and analyze the nitrogen content of the sampled liquefied natural gas. The humidity and nitrogen content values ​​are remotely transmitted online to the background computer through the wireless controller 39, and online sampling, detection and analysis of the sampled liquefied natural gas can be realized.

[0042] Step 2. During the displacement sampling safety inspection, while the liquefied natural gas is being detected and analyzed online, the transmission motor 24 can be started through the wireless controller 39, and the transmission motor 24 drives the linkage screw 22 to rotate forward, and the linkage screw 22 drives the threaded sleeve block 23 to move backward under the action of the thread, and the threaded sleeve block 23 moves backward along the inner wall of the support frame 21, and the threaded sleeve block 23 drives the two connecting shafts 25 to move backward, and the two connecting shafts 25 respectively drive one end of the two sleeve rods 26 to move backward, and the sleeve rod 26 drives the hinge shaft 27 to move tilted to the left, and at the same time, the other hinge shaft 27 moves tilted to the right.

[0043] At the same time, the hinge shaft 27 drives the sleeve slider 28 to move obliquely to the left, and the sleeve slider 28 moves obliquely to the left along the outer wall of the slide bar 31, and the sleeve slider 28 drives the sleeve strip 29 to move obliquely to the left, and the sleeve strip 29 enables the liquefied natural gas concentration sensor 30 to move obliquely to the left, and at the same time, another liquefied natural gas concentration sensor 30 can move obliquely to the right. In this way, the liquefied natural gas concentration sensor 30 can detect the liquefied natural gas concentration along the sampling tube 17 and the top of the sampling cut-off valve 18, and another liquefied natural gas concentration sensor 30 can detect the liquefied natural gas concentration on the sampling tube 17, the sampling valve 16 and the sampling analysis tank 2. When the liquefied natural gas concentration is not detected, the liquefied natural gas is in a non-leaking state. When the liquefied natural gas concentration is detected, it is known that the liquefied natural gas has a leakage problem, and the reduction motor 6 is immediately started through the wireless controller 39.

[0044] Step 3: During sampling and detection protection, the reduction motor 6 drives the screw 7 to rotate, and the screw 7 drives the socket plate 8 to move downward under the action of the thread transmission force, so that the socket plate 8 moves downward along the inner wall of the support frame 5, and at the same time, the socket plate 8 drives the protective top shell 10 to move downward, and the protective top shell 10 drives the socket block 11 to move downward, and the socket block 11 slides down along the outer wall guide of the guide rod 12. At the same time, the protective bottom shell 1 supports the support block 13, and the support block 13 supports the guide rod 12 to increase the stability of the guide rod 12, so that the protective top shell 10 can be squeezed on the upper surface of the protective bottom shell 1, so that the protective bottom shell 1 and the sampling and analysis tank 2 are squeezed and closed. To prevent liquefied natural gas from leaking out, the torque sensor 9 is used to sense the torque of the screw 7. When the torque value sensed by the torque sensor 9 is the same as the torque value set by the wireless controller 39, the reduction motor 6 is turned off by the wireless controller 39, so that the protective top shell 10 and the protective bottom shell 1 can be closed and protected according to the specified pressure, and protective operations can be performed when sampling natural gas for detection.

[0045] Step 4: When L-shaped safety coverage is achieved, the wireless controller 39 starts the delivery pump 35 at the same time. The delivery pump 35 generates suction force on the delivery hose 34. The delivery hose 34 pressurizes and absorbs the water inside the liquid tank 33. The pressurized water is delivered to the boosting pipe 36, and then poured into the L-shaped nozzle 37 by the boosting pipe 36. The L-shaped nozzle 37 realizes L-shaped downward spraying. After the water is sprayed downward, the sampling cut-off valve 18, the sampling tube 17 and the sampling valve 16 can be sprayed to cool down. At the same time, the L-shaped nozzle 37 pours the water into the annular nozzle 38. The annular nozzle 38 can realize annular spraying and cooling on the top of the sampling and analysis tank 2 to avoid combustion and explosion problems of liquefied natural gas during the sampling and detection process, thereby greatly improving the safety of liquefied natural gas sampling and detection.

[0046] The contents not described in detail in the specification belong to the prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment can be used. In this technical solution, the electrical control components not mentioned are not shown in the figure because they belong to the prior art and will not be described here.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An LNG online sampling, detection and analysis system, comprising a protective bottom shell (1), a sampling and analysis tank (2) and a nitrogen sensor (3), characterized in that: The sampling and analysis tank (2) is installed inside the protective bottom shell (1), the nitrogen sensor (3) is installed inside the sampling and analysis tank (2), a humidity sensor (4) is provided on one side of the nitrogen sensor (3), and a sampling and detection protection component is provided on one side of the protective bottom shell (1); The sampling detection protection assembly comprises a support frame (5) fixedly arranged on one side of the protection bottom shell (1), and a reduction motor (6) is fixedly installed on the bottom end of the inner wall of the support frame (5), a screw (7) is fixedly connected to the output end of the reduction motor (6), and a socket plate (8) is threadedly connected to the outer wall of the screw (7), and the socket plate (8) is slidably connected to the support frame (5), and a torque sensor (9) is fixedly installed on the top end of the screw (7), and the torque sensor (9) is fixedly connected to the support frame (5); A protective top shell (10) is fixedly mounted on one side of the sleeve plate (8), and the protective top shell (10) is slidably connected to the support frame (5); A displacement sampling safety detection component is provided on one side of the outer wall of the sampling and analysis tank (2), and the displacement sampling safety detection component comprises an L-shaped frame (20) fixedly mounted on one side of the outer wall of the sampling and analysis tank (2); One side of the L-shaped frame (20) is fixedly connected to a support frame (21); the inner wall of the support frame (21) is rotatably connected to a linkage screw rod (22); the outer wall of the linkage screw rod (22) is threadedly connected to a threaded sleeve block (23); the upper surface of the threaded sleeve block (23) is fixedly connected to two connecting shafts (25); the outer wall of each connecting shaft (25) is rotatably connected to a sleeve rod (26); the inner wall of the sleeve rod (26) is rotatably connected to a hinge shaft (27) at a position away from the connecting shaft (25); a sleeve slider (28) is fixedly mounted on the bottom end of the hinge shaft (27); a sleeve strip (29) is fixedly mounted on one side of the sleeve slider (28); a liquefied natural gas concentration sensor (30) is fixedly mounted on the inner wall of the sleeve strip (29); An L-shaped safety covering component is provided on the upper surface of the protective top shell (10).

2. The LNG online sampling, detection and analysis system according to claim 1 is characterized in that: The reduction motor (6) is used to drive the screw rod (7) to rotate, and the outer wall of the sleeve plate (8) and the inner wall of the support frame (5) are both smooth surfaces.

3. The LNG online sampling, detection and analysis system according to claim 1 is characterized in that: A sleeve block (11) is fixedly connected to one side of the protective top shell (10), and a guide rod (12) is slidably connected to the inner wall of the sleeve block (11); A support block (13) is fixedly mounted on the bottom end of the guide rod (12), and the support block (13) is fixedly connected to the protective bottom shell (1).

4. The LNG online sampling, detection and analysis system according to claim 1 is characterized in that: The top end of the nitrogen sensor (3) is fixedly connected to a support (14), and the sampling and analysis tank (2) and the humidity sensor (4) are both fixedly connected to the support (14).

5. The LNG online sampling, detection and analysis system according to claim 1 is characterized in that: The bottom end of the sampling and analysis tank (2) is fixedly connected to a lower row valve (15), and the other side of the outer wall of the sampling and analysis tank (2) is fixedly connected to a sampling valve (16); One end of the sampling valve (16) is threadedly connected to a sampling tube (17), one end of the sampling tube (17) is fixedly connected to a sampling shutoff valve (18), and one end of the sampling shutoff valve (18) is fixedly connected to a liquefied natural gas delivery pipe (19); The sampling cut-off valve (18) is fixedly connected to the protective bottom shell (1).

6. The LNG online sampling, detection and analysis system according to claim 1 is characterized in that: A transmission motor (24) is fixedly mounted on one side of the inner wall of the support frame (21), and the transmission motor (24) is used to drive the linkage screw rod (22) to rotate; a slide rod (31) is slidably connected to the inner wall of each sleeve sliding block (28), and the two slide rods (31) are fixedly connected to the L-shaped frame (20); A distance sensor (32) is fixedly connected to the upper surface of the L-shaped frame (20) at a position away from the sleeve slider (28), and the distance sensor (32) is used to sense the movement distance of the sleeve slider (28). The threaded sleeve block (23) is slidably connected to the support frame (21), the output end of the transmission motor (24) is fixedly connected to the linkage screw rod (22), the sleeve slider (28) is slidably connected to the L-shaped frame (20), and the inner wall of the L-shaped frame (20) and the outer wall of the sleeve slider (28) are both smooth surfaces.

7. The LNG online sampling, detection and analysis system according to claim 1 is characterized in that: The L-shaped safety covering assembly comprises a liquid tank body (33) fixedly arranged on the upper surface of the protective top shell (10); The inner wall of the liquid tank body (33) is fixedly connected to a delivery hose (34), a delivery pump (35) is fixedly installed on the top of the delivery hose (34), and the output end of the delivery pump (35) is fixedly connected to a boosting pipe (36), and the boosting pipe (36) is fixedly connected to the protective top shell (10); The bottom end of the boost pipe (36) is fixedly connected to an L-shaped nozzle (37), and one end of the L-shaped nozzle (37) is fixedly connected to an annular nozzle (38); A battery (40) is fixedly connected to the outer wall of the protective bottom shell (1) at a position adjacent to one side of the support frame (5), a wireless controller (39) is fixedly installed on one side of the battery (40), and the wireless controller (39) is fixedly connected to the protective bottom shell (1).

8. The LNG online sampling, detection and analysis system according to claim 7 is characterized in that: The cross-sectional shape of the L-shaped nozzle (37) is L-shaped, and the cross-sectional shape of the annular nozzle (38) is annular.

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