River-crossing gas pipeline leakage monitoring device and method based on distributed optical fiber sensing

Abstract

The application belongs to the field of pipeline leakage monitoring, in particular to a river-crossing gas pipeline leakage monitoring device based on distributed optical fiber sensing. The existing pipeline transmission detection is inconvenient for regular detection because it is immersed in water for a long time. When the pipeline leaks, the pipeline cannot be plugged in time. The present application proposes the following scheme. It includes multiple main pipelines, and each end of the multiple main pipelines is provided with an auxiliary pipe connected in communication. The outer walls of adjacent two auxiliary pipes are fixedly provided with mounting plates, and the mounting plates are fixedly connected through a first connecting assembly. In the application, the vibration of multiple optical fiber bodies can monitor whether the pipeline leaks, and the monitoring effect is good. The optical fiber body reserved in the mounting plate can be used without re-laying the optical fiber body when the optical fiber body fails. Water and E-107 polyurethane in the protection box react to achieve the purpose of stopping water. The cross groove facilitates subsequent maintenance by pumping out the water in the pipeline.

Description

Technical Field

[0001] This invention relates to the field of pipeline leakage monitoring technology, and in particular to a leakage monitoring device and method for cross-river gas pipelines based on distributed optical fiber sensing. Background Technology

[0002] Natural gas pipelines are pipelines that transport natural gas (including associated gas from oil fields) from extraction sites or processing plants to urban gas distribution centers or industrial users. Also known as gas transmission pipelines, they are the primary method for transporting large quantities of natural gas over land. Natural gas pipelines account for approximately half of the world's total pipeline length. Gas transmission pipelines are assembled by connecting individual pipes one by one. Modern gas gathering and transmission pipelines are constructed by welding steel pipes together. There are various types of steel pipes, including seamless pipes, spiral welded pipes, and straight welded pipes. Seamless pipes are suitable for pipes with a diameter of 529 mm or less, while spiral welded and straight welded pipes are suitable for large-diameter pipes. The cross-sectional structure of gathering and transmission pipelines varies. Complex structures include an inner coating, steel pipe, outer insulation layer, and thermal insulation (cold insulation) layer; simpler structures consist only of a steel pipe and an outer insulation layer, with the inner coating and thermal insulation (cold insulation) layer determined based on the gas transmission process.

[0003] The following problems still exist when transporting gas via underwater pipelines:

[0004] 1. Because it is submerged underwater for a long time, it is inconvenient to conduct regular pipeline transmission inspections. Therefore, even if unstable factors occur in the pipeline transmission, external personnel can only detect them when a large-scale leak or instability occurs.

[0005] 2. When a pipeline leaks, it cannot be sealed off in a timely manner;

[0006] 3. No fiber optic cables were pre-installed, so if a fiber optic cable is damaged, it needs to be re-laid, which is time-consuming and labor-intensive. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies, such as the inconvenience of regular pipeline transmission monitoring due to the long-term immersion of pipelines underwater, the fact that even if unstable factors occur in the pipeline transmission, external personnel can only detect them after a large-scale leak or instability, the inability to promptly seal the pipeline when a leak occurs, and the need to re-lay the fiber optic cable when it is damaged, which is time-consuming and labor-intensive. The invention proposes a leak monitoring device for cross-river gas pipelines based on distributed optical fiber sensing.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A gas pipeline leakage monitoring device based on distributed optical fiber sensing across a river includes multiple main pipelines, with connected auxiliary pipes at both ends of each main pipeline. An installation plate is fixedly fitted on the outer wall of two adjacent auxiliary pipes, and the multiple installation plates are fixedly connected to each other by a first connecting component.

[0010] The mounting plate has multiple U-shaped grooves inside, and multiple optical fiber bodies are installed inside the main pipe, auxiliary pipe, and U-shaped grooves. The outer wall of the main pipe has a water extraction hole, and a sealing component for sealing the water extraction hole is installed inside the water extraction hole.

[0011] A sealing plate is slidably fitted on the outer wall of the main pipeline, and the sealing plate and the mounting plate are fixedly connected by a second connecting assembly.

[0012] Preferably, the first connecting assembly includes a second screw that passes through both mounting plates, and one end of the second screw is threaded with a mating third nut.

[0013] Preferably, the sealing assembly includes a threaded plug with threads extending through the inside of the pumping hole, and the top of the threaded plug is provided with a cross groove.

[0014] Preferably, the second connecting assembly includes the same first screw that passes through the sealing plate and the mounting plate, the outer wall of the first screw is threaded with a matching second nut and a first nut, and the outer wall of the main pipe is fixedly fitted with a fixing ring, which is used in conjunction with the sealing plate.

[0015] Preferably, both the first screw and the second screw are provided with washers.

[0016] Preferably, the inner walls of the main pipe and the auxiliary pipe are fixedly connected with multiple support components, and the optical fiber body is disposed inside the support components.

[0017] Preferably, the two mounting plates are provided with the same protective box inside, and the protective box has multiple round holes on both sides. E-107 polyurethane is placed inside the protective box.

[0018] Preferably, rubber pads are provided on the sides of the two mounting plates that are close to each other.

[0019] The monitoring method for a cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing specifically includes the following steps:

[0020] S1. Insert multiple optical fiber bodies into the support assembly, leaving a section inside the U-shaped groove. Place the inner ring onto the optical fiber body through the opening. Align the guide groove with the guide block and push the inner ring towards the installation groove. Multiple extrusion parts will compress the inner ring, causing it to press towards the optical fiber body. The extrusion force is used to fix the optical fiber body. When the inner ring is close to the installation groove, use fastening bolts for further tightening. This completes the installation and fixing of the optical fiber body. The vibration of multiple optical fiber bodies can monitor for leaks in the pipeline, providing good monitoring results. The optical fiber bodies pre-installed inside the mounting plate do not need to be re-laid when the optical fiber body fails, greatly improving work efficiency.

[0021] S2. When a leak occurs in a main pipe, water enters the interior of the main pipe and extends to both ends of the main pipe. The water enters the interior of the two protective boxes and reacts with the E-107 polyurethane inside the protective boxes. After reacting with the water, it quickly expands and blocks the cracks, achieving the purpose of stopping the water flow and blocking multiple round holes to prevent water from flowing into the next main pipe.

[0022] S3. During maintenance, unscrew the corresponding first and second nuts. At this time, the first screw can be removed to release the braking state of the sealing plate. The threaded plug can then be exposed and removed through the cross groove. The water inside the main pipe can be pumped out through the water extraction hole, making it convenient to pump out the water inside the pipe during subsequent maintenance.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] In this invention, the inner ring is made of rubber. The inner ring is fitted onto the optical fiber body through the opening. The guide groove is aligned with the guide block and the inner ring is pushed in the direction of the mounting groove. The guide block and guide groove are used for positioning and guidance. The arc surface makes it easy to push the inner ring into the arc surface.

[0025] In this invention, during the pushing process, multiple extrusion parts will extrude the inner ring, causing the inner ring to be pressed towards the optical fiber body. The extrusion force is used to fix the optical fiber body. When the inner ring is close to the mounting groove, fastening bolts are used for further tightening, thus completing the installation and fixing of the optical fiber body.

[0026] In this invention, the vibration of multiple optical fiber bodies can be used to monitor whether there is a leak in the pipeline, and the monitoring effect is good. The optical fiber bodies reserved inside the mounting plate can be laid without replacing the optical fiber bodies when they fail, which greatly improves work efficiency. Water reacts with the E-107 polyurethane inside the protective box. After interacting with water, it quickly expands and blocks the cracks to achieve the purpose of stopping water. The cross groove facilitates the extraction of water from the pipeline during subsequent maintenance. Attached Figure Description

[0027] Figure 1 This is a first-view three-dimensional structural diagram of the cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing proposed in this invention.

[0028] Figure 2 This is a three-dimensional structural diagram from a second perspective of the cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing proposed in this invention.

[0029] Figure 3 This is a schematic diagram of the mounting plate and sealing plate in the cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing proposed in this invention.

[0030] Figure 4 This is a schematic diagram of the main pipeline and auxiliary pipeline in the cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing proposed in this invention.

[0031] Figure 5 This is a schematic diagram of the main pipeline and sealing plate in the cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing proposed in this invention.

[0032] Figure 6 This is a three-dimensional cross-sectional view of the mounting plate in the cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing proposed in this invention.

[0033] Figure 7 This is a schematic diagram showing the connection between the main pipeline and the optical fiber body in the cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing proposed in this invention.

[0034] Figure 8 This is an exploded schematic diagram of some structures in the cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing proposed in this invention.

[0035] Figure 9 This is a three-dimensional schematic diagram of the outer ring of the cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing proposed in this invention.

[0036] Figure 10 This is a three-dimensional schematic diagram of the inner ring of the cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing proposed in this invention.

[0037] In the diagram: 1. Main pipe; 2. First nut; 3. First screw; 4. Mounting plate; 5. Sealing plate; 6. Auxiliary pipe; 7. Support assembly; 701. Outer ring; 702. Mounting groove; 703. Bolt hole; 704. Extrusion section; 705. Arc surface; 706. Guide block; 707. Round hole; 708. Inner ring; 709. Stepped hole; 710. Opening; 711. Guide groove; 712. Fastening bolt; 8. Fiber optic body; 9. Protective box; 10. Second nut; 11. Washer; 12. Second screw; 13. Third nut; 14. Fixing ring; 15. Drain hole; 16. Cross groove; 17. Threaded plug; 18. Round hole; 19. U-shaped groove. Detailed Implementation

[0038] 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. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] Example 1

[0040] Reference Figure 1-6 A gas pipeline leakage monitoring device based on distributed optical fiber sensing includes multiple main pipelines 1, with connected auxiliary pipes 6 at both ends of the multiple main pipelines 1. The outer walls of two adjacent auxiliary pipes 6 are fixedly fitted with mounting plates 4. Multiple mounting plates 4 are fixedly connected to each other by a first connecting component. The first connecting component includes a second screw 12 that penetrates two mounting plates 4, and a third nut 13 for use is threaded onto one end of the second screw 12.

[0041] The mounting plate 4 has multiple U-shaped grooves 19 inside. Multiple optical fiber bodies 8 are installed inside the main pipe 1, auxiliary pipe 6, and U-shaped grooves 19. The outer wall of the main pipe 1 has a water extraction hole 15. The water extraction hole 15 is equipped with a sealing component for sealing the water extraction hole 15. The sealing component includes a threaded plug 17 with threads passing through the water extraction hole 15. The top of the threaded plug 17 is provided with a cross groove 16.

[0042] A sealing plate 5 is slidably sleeved on the outer wall of the main pipe 1. The sealing plate 5 and the mounting plate 4 are fixedly connected by a second connecting assembly. The second connecting assembly includes the same first screw 3 that passes through the sealing plate 5 and the mounting plate 4. The outer wall of the first screw 3 is threaded with a second nut 10 and a first nut 2 for use. A fixing ring 14 is fixedly sleeved on the outer wall of the main pipe 1. The fixing ring 14 is used in conjunction with the sealing plate 5.

[0043] Example 2

[0044] Reference Figure 1-10A gas pipeline leakage monitoring device based on distributed optical fiber sensing includes multiple main pipelines 1. Each end of the main pipeline 1 is provided with an auxiliary pipe 6. The outer wall of two adjacent auxiliary pipes 6 is fixedly fitted with an installation plate 4. The multiple installation plates 4 are fixedly connected by a first connecting component. The first connecting component includes a second screw 12 that penetrates two installation plates 4. One end of the second screw 12 is threaded with a third nut 13 for use. When a leak occurs in a certain main pipeline 1, water enters the interior of the main pipeline 1 and extends to both ends of the main pipeline 1. The water enters the interior of two protective boxes 9 and reacts with the E-107 polyurethane inside the protective box 9. After interacting with the water, it quickly expands and blocks the cracks to achieve the purpose of stopping the water flow and blocking multiple round holes 18 to prevent water from flowing into the next main pipeline 1.

[0045] The mounting plate 4 has multiple U-shaped grooves 19 inside. Multiple optical fiber bodies 8 are installed inside the main pipe 1, auxiliary pipe 6, and U-shaped grooves 19. The outer wall of the main pipe 1 has a water extraction hole 15. The water extraction hole 15 is equipped with a sealing component for sealing the water extraction hole 15. The sealing component includes a threaded plug 17 with threads passing through the inside of the water extraction hole 15. The top of the threaded plug 17 is provided with a cross groove 16. During maintenance, the corresponding first nut 2 and second nut 10 are unscrewed. At this time, the first screw 3 can be removed, releasing the braking state of the sealing plate 5. The threaded plug 17 is exposed and can be removed through the cross groove 16. Water can be extracted from the inside of the main pipe 1 through the water extraction hole 15, which is convenient for subsequent maintenance.

[0046] A sealing plate 5 is slidably sleeved on the outer wall of the main pipe 1. The sealing plate 5 and the mounting plate 4 are fixedly connected by a second connecting component. The second connecting component includes the same first screw 3 that passes through the sealing plate 5 and the mounting plate 4. The outer wall of the first screw 3 is threaded with a second nut 10 and a first nut 2 for use. A fixing ring 14 is fixedly sleeved on the outer wall of the main pipe 1. The fixing ring 14 is used in conjunction with the sealing plate 5. Multiple optical fiber bodies 8 are inserted into the interior of the support component 7, with a section left inside the U-shaped groove 19. The vibration of multiple optical fiber bodies 8 can detect whether there is a leak in the pipe. The monitoring effect is good. The optical fiber bodies 8 reserved inside the mounting plate 4 can be used without re-laying the optical fiber bodies 8 when they fail, which greatly improves work efficiency.

[0047] Washers 11 are provided on both the first screw 3 and the second screw 12. Multiple support components 7 are fixedly connected to the inner walls of the main pipe 1 and the auxiliary pipe 6. The optical fiber body 8 is located inside the support component 7. The same protective box 9 is provided inside the two mounting plates 4. Multiple round holes 18 are opened on both sides of the protective box 9. E-107 polyurethane is placed inside the protective box 9. Rubber pads are provided on the side of the two mounting plates 4 that are close to each other.

[0048] The monitoring method for a cross-river gas pipeline leakage monitoring device based on distributed optical fiber sensing specifically includes the following steps:

[0049] S1. Insert multiple fiber optic bodies 8 into the support assembly 7, leaving a section inside the U-shaped groove 19. Fit the inner ring 708 onto the fiber optic body 8 through the opening 710. Align the guide groove 711 with the guide block 706 and push the inner ring 708 towards the mounting groove 702. Multiple extrusion parts 704 will extrude the inner ring 708, causing it to press towards the fiber optic body 8. The extrusion force is used to fix the fiber optic body 8. When the inner ring 708 is close to the mounting groove 702, use the fastening bolts 712 for further tightening. This completes the installation and fixing of the fiber optic body 8. The vibration of multiple fiber optic bodies 8 can monitor whether there is a leak in the pipeline. The monitoring effect is good. The fiber optic bodies 8 reserved inside the mounting plate 4 do not need to be re-laid when the fiber optic body 8 fails, which greatly improves work efficiency.

[0050] S2. When a leak occurs in a main pipe 1, water enters the interior of the main pipe 1 and extends to both ends of the main pipe 1. The water enters the interior of the two protective boxes 9 and reacts with the E-107 polyurethane inside the protective boxes 9. After interacting with the water, it quickly expands and blocks the cracks, achieving the purpose of stopping the water flow and blocking multiple round holes 18 to prevent water from flowing into the next main pipe 1 again.

[0051] S3. During maintenance, unscrew the corresponding first nut 2 and second nut 10. At this time, the first screw 3 can be removed to release the braking state of the sealing plate 5. The threaded plug 17 can then be exposed and removed through the cross groove 16. The water inside the main pipe 1 can be pumped out through the water extraction hole 15, which is convenient for subsequent maintenance.

[0052] However, as is well known to those skilled in the art, the working principle and wiring method of the optical fiber body 8 are commonplace and are all conventional means or common knowledge, so they will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0053] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A river-crossing gas pipeline leakage monitoring device based on distributed optical fiber sensing, characterized in that, Including multi -segment main pipeline (1), both ends of multi -segment main pipeline (1) are provided with the auxiliary pipe (6) connected, the outer wall of adjacent two auxiliary pipes (6) is fixedly provided with the mounting plate (4), and a plurality of mounting plates (4) are fixedly connected by a first connecting assembly. The inside of the mounting plate (4) is provided with a plurality of U-shaped grooves (19), and the inside of the main pipeline (1), the auxiliary pipe (6) and the U-shaped groove (19) is provided with a plurality of optical fiber bodies (8), the outer wall of the main pipeline (1) is provided with a water hole (15), and the inside of the water hole (15) is provided with a plugging assembly for plugging the water hole (15); The outer wall of the main pipeline (1) is slidably provided with a blocking plate (5), the blocking plate (5) and the mounting plate (4) are fixedly connected by a second connecting assembly, the first connecting assembly comprises a second screw (12) penetrating through two mounting plates (4), one end of the second screw (12) is threadedly provided with a third nut (13) used in cooperation, the second connecting assembly comprises a same first screw (3) penetrating through the blocking plate (5) and the mounting plate (4), the outer wall of the first screw (3) is threadedly provided with a second nut (10) and a first nut (2) used in cooperation, the outer wall of the main pipeline (1) is fixedly provided with a fixing ring (14), the fixing ring (14) is used in cooperation with the blocking plate (5), the inside of two mounting plates (4) is provided with a same protection box (9), a plurality of round holes (18) are formed in the two sides of the protection box (9), and the inside of the protection box (9) is placed with E-107 polyurethane.

2. The distributed optical fiber sensing based river-crossing gas pipeline leakage monitoring device according to claim 1, characterized in that, The plugging assembly comprises a threaded plug (17) threaded in the inside of the water hole (15).

3. The over-river gas pipeline leakage monitoring device based on distributed optical fiber sensing according to claim 2, characterized in that, The first screw (3) and the second screw (12) are both provided with a gasket (11).

4. The over-river gas pipeline leakage monitoring device based on distributed optical fiber sensing according to claim 3, characterized in that, The inner wall of the main pipeline (1) and the auxiliary pipe (6) is fixedly connected with a plurality of supporting assemblies (7), and the optical fiber body (8) is arranged in the inside of the supporting assembly (7).

5. The over-river gas pipeline leakage monitoring device based on distributed optical fiber sensing according to claim 4, characterized in that, Two mounting plates (4) are provided with rubber pads on the side close to each other. 6.The over-river gas pipeline leakage monitoring device based on distributed optical fiber sensing according to claim 5, characterized in that, The support assembly (7) comprises an outer ring (701) fixed on the inner wall of the main pipeline (1), the outer ring (701) is provided with a circular hole (707) for mounting the optical fiber body (8), one side of the outer ring (701) is provided with a mounting groove (702), the inner wall of the mounting groove (702) is provided with a plurality of extrusion portions (704), the mounting groove (702) is provided with a plurality of bolt holes (703), the mounting groove (702) is fixedly connected with an inner ring (708) through a plurality of fastening bolts (712) and the bolt holes (703), the inner ring (708) is provided with a stepped hole (709) matched with the fastening bolt (712), the inner wall of the mounting groove (702) is symmetrically provided with two guide blocks (706), the inner ring (708) is provided with a guide groove (711) matched with the guide block (706), and the inner ring (708) is provided with an opening (710), and the optical fiber body (8) is fixed on the outer ring (701) through the inner ring (708).

7. The method for monitoring the over-river gas pipeline leakage monitoring device based on distributed optical fiber sensing according to claim 6, characterized in that, Specifically comprising the following steps: S1, a plurality of optical fiber bodies (8) are inserted into the inside of the support assembly (7), and a part is left in the inside of the U-shaped groove (19), the inner ring (708) is sleeved on the optical fiber body (8) from the opening (710), the guide groove (711) is aligned with the guide block (706), and the inner ring (708) is pushed to the direction of the mounting groove (702), the plurality of extrusion portions (704) extrude the inner ring (708), so that the inner ring (708) is extruded to the direction of the optical fiber body (8), the fixing of the optical fiber body (8) is realized by the extrusion force, when the inner ring (708) is tightly attached to the mounting groove (702), the fastening bolt (712) is used for further fastening, the installation and fixing of the optical fiber body (8) are completed, the vibration of the plurality of optical fiber bodies (8) can monitor whether the pipeline leaks, the monitoring effect is good, the optical fiber body (8) reserved in the inside of the mounting plate (4) can avoid the need to re-lay the optical fiber body (8) when the optical fiber body (8) fails, and the working efficiency is greatly improved; S2, when a certain main pipeline (1) leaks, water enters the inside of the main pipeline (1), extends to both ends of the main pipeline (1), enters the inside of the two protection boxes (9), reacts with the E-107 polyurethane in the inside of the protection box (9), expands rapidly to block the cracks after reacting with water, and achieves the purpose of stopping water, blocks a plurality of circular holes (18), and avoids water from flowing into the inside of the next main pipeline (1) again; S3, during maintenance, the corresponding first nut (2) and second nut (10) are unscrewed, the first screw (3) can be taken out at this time, the braking state of the blocking plate (5) is released, the threaded plug (17) is leaked out at this time, the threaded plug (17) can be taken out through the cross slot (16), and the water in the inside of the main pipeline (1) can be pumped out through the water pumping hole (15), which is convenient for pumping out the water in the inside of the pipeline during subsequent maintenance.

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