Leak-proof detection device for chemical long-distance pipeline

Abstract

The utility model relates to the technical field of chemical long-distance pipeline leakage prevention, and discloses a chemical long-distance pipeline leakage prevention detection device which comprises a conveying pipe, flange plates are fixedly connected to the two ends of the conveying pipe, and an optical fiber cable is wound around the outer surface of the conveying pipe. Through the structural design that the optical fiber wire is wound on the outer surface of the pipeline and the modified polyacrylonitrile adsorption sensing layer is attached to the outer surface of the pipeline in a matched mode, high-sensitivity and distributed leakage detection can be achieved by adsorbing temperature changes caused by leaked gas; the sensing layer material is convenient to replace through the detachable dismounting plate structure, and the service life of the device is prolonged. Meanwhile, the device is provided with a pressure sensor and optical fiber data comparison mechanism, so that the accuracy and redundancy of detection data are improved. In addition, leakage poison gas can be pretreated and diluted through the diluent box and the air suction system integrated in the device and discharged after being filtered, the preliminary emergency disposal function is achieved, the leakage diffusion risk is effectively reduced, and the pipeline operation safety is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of chemical long-distance pipeline leakage prevention technology, specifically a chemical long-distance pipeline leakage prevention detection device. Background Technology

[0002] The long-distance transportation of chemical gases in industries such as petrochemicals, pharmaceuticals, and fine chemicals is crucial for achieving continuous and automated production. Because chemical gases often possess hazardous properties such as toxicity, corrosiveness, flammability, and explosiveness, their pipeline systems require stringent technical measures in design, monitoring, and operation and maintenance.

[0003] Existing technologies commonly employ methods such as pressure detection, gas concentration detection, or infrared thermal imaging to monitor leaks. However, these methods suffer from drawbacks such as slow response times, large blind spots, and inability to pinpoint the exact location of leaks. This is especially problematic in complex terrain or underground sections of long-distance pipelines, where conventional methods are difficult to deploy and maintain efficiently.

[0004] Therefore, it is necessary to design a leak detection device for long-distance chemical pipelines to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a leak detection device for long-distance chemical pipelines to solve the technical problems mentioned in the background.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a leak detection device for long-distance chemical pipelines, comprising a conveying pipe, flanges fixedly connected to both ends of the conveying pipe, and an optical fiber wound around the outer surface of the conveying pipe. Two symmetrical disassembly plates are attached to the outer surface of the optical fiber, and an adsorption sensing layer is coated on the bottom of each of the two disassembly plates. Connecting arc blocks are fixedly connected to both sides of each disassembly plate, and four connecting arc blocks are respectively connected to one side of each of the two flanges by multiple bolts. A connecting plate is fixedly connected between the two flanges. An optical fiber tube is fixedly inserted into the outer surface of the connecting plate, and both ends of the optical fiber are inserted into the optical fiber tube. A diluent tank is fixedly connected to the bottom of the connecting plate. An air inlet pipe is opened on one side of the diluent tank, and a filling pipe is opened on the top of the diluent tank. A suction fan is installed inside the air inlet pipe. An air outlet pipe is connected to the top of the diluent tank. A filter plate is fixedly connected inside the air outlet pipe. A pressure tapping pipe is opened on the outer surface of the delivery pipe, and the top end of the pressure tapping pipe penetrates the outer surface of the two disassembly plates. A pressure sensor is installed on the top end of the pressure tapping pipe.

[0007] Preferably, a piston is installed at the top of the filling tube, and the top end of the filling tube extends through the outer surface of the connecting plate.

[0008] Preferably, one side of each of the two flanges has an annular groove, and a sealing ring is fixedly connected inside each of the two annular grooves.

[0009] Preferably, the adsorption sensing layer is made of modified polyacrylonitrile, and the thickness of the disassembly plate is 50-100 μm.

[0010] Preferably, the connecting plate is arc-shaped and is located directly above the pressure sensor and the pressure tapping tube.

[0011] Preferably, the diluent tank is fixed above the delivery pipe, and the diluent tank is located between the delivery pipe and the connecting plate, and the diluent tank is located between the pressure sensor and the optical fiber conduit.

[0012] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0013] This invention utilizes a structural design that involves winding optical fibers around the outer surface of a pipeline and attaching a modified polyacrylonitrile adsorption sensing layer. This allows for highly sensitive, distributed leak detection by observing temperature changes caused by the adsorption of leaking gas. A detachable mounting plate facilitates replacement of the sensing layer material, extending the device's lifespan. Furthermore, the device incorporates a pressure sensor and optical fiber data comparison mechanism, improving the accuracy and redundancy of the detection data. In addition, the integrated dilution tank and suction system pre-treat and dilute leaked toxic gases, filtering them before discharge, providing preliminary emergency response capabilities, effectively reducing the risk of leak spread, and ensuring pipeline safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an exploded view of the conveying pipe structure of this utility model;

[0016] Figure 3 This is an exploded view of the air outlet duct structure of this utility model;

[0017] In the diagram: 1. Delivery pipe; 3. Sealing ring; 4. Flange; 5. Connecting plate; 6. Fiber optic cable; 7. Filling pipe; 8. Air outlet pipe; 9. Diluent tank; 10. Air inlet pipe; 11. Pressure tapping pipe; 12. Pressure sensor; 13. Disassembly plate; 14. Connecting arc block; 15. Fiber optic cable; 16. Fan; 17. Filter plate. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0019] Obviously, many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Please see Figure 1-3 This utility model provides a leak detection device for long-distance chemical pipelines, including a delivery pipe 1. Flanges 4 are fixedly connected to both ends of the delivery pipe 1. An optical fiber 15 is wound around the outer surface of the delivery pipe 1, and two symmetrical disassembly plates 13 are attached to the outer surface of the optical fiber 15. An adsorption sensing layer is coated on the bottom of each of the two disassembly plates 13. Connecting arc blocks 14 are fixedly connected to both sides of each disassembly plate 13. Four connecting arc blocks 14 are respectively connected to one side of each of the two flanges 4 by multiple bolts. A connecting plate 5 is fixedly connected between the two flanges 4. An optical fiber tube 6 is fixedly inserted into the outer surface of the connecting plate 5. Both ends of the optical fiber 15 are inserted into the optical fiber conduit 6. A diluent tank 9 is fixed to the bottom of the connecting plate 5. An air inlet pipe 10 is provided on one side of the diluent tank 9, and a filling pipe 7 is provided on the top of the diluent tank 9. A suction fan 16 is installed inside the air inlet pipe 10. An air outlet pipe 8 is connected to the top of the diluent tank 9. A filter plate 17 is fixed to the inside of the air outlet pipe 8. A pressure-sensing pipe 11 is provided on the outer surface of the delivery pipe 1. The top end of the pressure-sensing pipe 11 penetrates the outer surface of two disassembly plates 13, and a pressure sensor 12 is installed on the top end of the pressure-sensing pipe 11. By connecting multiple delivery pipes 1, ... The lengths of multiple delivery pipes 1 can be adjusted according to the specific needs of the pipeline. Fiber optic cables 15 on these pipes connect to a ground-mounted fiber optic sensor demodulator to detect gas leaks. The detection method involves the absorption of leaking gas at the bottom of the disassembly plate 13, increasing its temperature. This data is then transmitted to the fiber optic sensor demodulator via fiber optic cables 15. The temperature data is used to monitor gas leaks, allowing for targeted detection of the corresponding pipeline and timely repair of the leak area. In cases of chemical gas leaks where maintenance personnel are unavailable, [further details are needed]. First, by turning on the suction fan 16 inside the air inlet pipe 10, the toxic chemical gas is drawn into the dilution tank 9. The dilution liquid corresponding to the toxic chemical gas is put into the dilution tank 9 in advance, so as to facilitate emergency use. The gas can be safely discharged and facilitated by the filtration of the filter plate 17. The threaded connection of the two connecting arc blocks 14 makes it easy to replace the two disassembly plates 13. In addition, the pressure sensor 12 installed on the pressure tapping pipe 11 can also detect the gas pressure inside the corresponding delivery pipe 1. By comparing the changes in temperature and pressure data, the accuracy of the data can be improved.

[0021] To facilitate the insertion and extraction of the corresponding diluent, a piston is installed at the top of the filling tube 7, and the top end of the filling tube 7 extends through the outer surface of the connecting plate 5.

[0022] In order to ensure a sealed connection between the multiple delivery pipes 1, one side of each of the two flanges 4 has an annular groove, and a sealing ring 3 is fixedly connected inside each of the two annular grooves.

[0023] In order to better absorb toxic chemical gases and transmit temperature change data through optical fiber 15, the material of the adsorption sensing layer is modified polyacrylonitrile, and the thickness of the disassembly plate 13 is 50-100μm.

[0024] To protect the pressure tapping tube 11 and the pressure sensor 12, the connecting plate 5 is arc-shaped and located directly above the pressure sensor 12 and the pressure tapping tube 11.

[0025] In order to pre-treat toxic chemical gases before maintenance and reduce the impact range of leaks, the diluent tank 9 is fixed above the delivery pipe 1, and the diluent tank 9 is located between the delivery pipe 1 and the connecting plate 5, and the diluent tank 9 is located between the pressure sensor 12 and the optical fiber conduit 6.

[0026] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0027] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0028] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A device for detecting leaks in long chemical pipelines, comprising a pipeline (1), characterized in that: Both ends of the conveying pipe (1) are fixedly connected to flanges (4), and an optical fiber (15) is wound around the outer surface of the conveying pipe (1). Two symmetrical disassembly plates (13) are attached to the outer surface of the optical fiber (15). The bottom of the two disassembly plates (13) is coated with an adsorption sensing layer. Connecting arc blocks (14) are fixedly connected to both sides of the disassembly plates (13). The four connecting arc blocks (14) are respectively connected to one side of the two flanges (4) by multiple bolt threads. A connecting plate (5) is fixedly connected between the two flanges (4). An optical fiber tube (6) is fixedly inserted into the outer surface of the connecting plate (5), and the two ends of the optical fiber (15) are threaded through it. Inside the optical fiber tube (6), and at the bottom of the connecting plate (5), a diluent tank (9) is fixedly connected. An air inlet pipe (10) is provided on one side of the diluent tank (9), and a filling pipe (7) is provided on the top of the diluent tank (9). A suction fan (16) is installed inside the air inlet pipe (10). An air outlet pipe (8) is connected to the top of the diluent tank (9). A filter plate (17) is fixedly connected inside the air outlet pipe (8). A pressure tapping pipe (11) is provided on the outer surface of the conveying pipe (1). The top end of the pressure tapping pipe (11) penetrates the outer surface of the two disassembly plates (13). A pressure sensor (12) is installed on the top end of the pressure tapping pipe (11).

2. A chemical pipeline leak detection apparatus as claimed in claim 1, wherein: A piston is installed at the top of the filling tube (7), and the top end of the filling tube (7) extends through the outer surface of the connecting plate (5).

3. A chemical pipeline leak detection apparatus as claimed in claim 1, wherein: Both flanges (4) have annular grooves on one side, and both annular grooves are fixed with sealing rings (3).

4. A chemical pipeline leak detection apparatus as claimed in claim 1, wherein: The adsorption sensing layer is made of modified polyacrylonitrile, and the thickness of the disassembly plate (13) is 50-100μm.

5. A chemical pipeline leak detection apparatus as claimed in claim 1, wherein: The connecting plate (5) is arc-shaped and is located directly above the pressure sensor (12) and the pressure tap (11).

6. A chemical pipeline leak detection apparatus as claimed in claim 1, wherein: The diluent tank (9) is fixed above the delivery pipe (1), and the diluent tank (9) is located between the delivery pipe (1) and the connecting plate (5), and the diluent tank (9) is located between the pressure sensor (12) and the optical fiber tube (6).

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