High-pressure underground gas storage cable leading-out sealing device and construction method thereof

Abstract

The invention discloses a high-pressure underground gas storage cable leading-out sealing device and a construction method thereof, belongs to the technical field of underground gas storage and can solve the problem that an existing underground gas storage cable sealing device is poor in sealing effect. The device comprises a threading pipe embedded in a plug of a gas storage; the cable in the gas storage is provided with an exposed part of an exposed cable core; the sealing sleeve is arranged on the exposed part of the cable in a sleeving manner and comprises a first sleeve and sealing covers used for sealing two ports of the first sleeve, and the sealing covers are connected with the unexposed part of the cable in a sealing manner; the sealing sleeve is filled with a first sealing material; the sealing sleeve is sleeved with the sealing pipe, and one end of the sealing pipe is connected with the end of the threading pipe; the closed pipe comprises a second sleeve and a rigid plugging structure used for plugging two ports of the second sleeve, the rigid plugging structure is in sealed connection with the unexposed part of the cable, and the closed pipe is filled with a flexible sealing material. The cable leading-out sealing device is used for the gas storage.

Description

Technical Field

[0001] The invention relates to a high-pressure underground gas storage cable lead-out sealing device and a construction method thereof, belonging to the technical field of underground gas storage. Background Art

[0002] Compressed air energy storage is a large-scale physical energy technology that can be widely used in power grid peak shaving and valley filling and large-scale new energy consumption. With the power grid's demand for large-scale long-term energy storage, the demand for compressed air energy storage above one million megawatts is also growing rapidly. Compressed air energy storage needs to operate frequently under 7MPa~10MPa alternating stress and is in an "unattended" state. Its stability and safety are particularly important for the normal operation of the compressed air energy storage system. Therefore, deploying a compressed air storage monitoring system to monitor the operating status of underground gas storage in real time will help ensure the stability and safety of the system operation.

[0003] When arranging a monitoring system in a gas storage reservoir, the biggest problem is how to ensure the sealing of the monitoring cable lead-out. Usually, there are two problems that need to be solved: (1) When the monitoring instrument in the gas storage reservoir is connected to its wiring, it is necessary to peel off the outer sheath of the cable and connect the built-in core wire to the equipment. This forms an open channel between the cable core wire and its sheath. When the gas storage reservoir is in operation, compressed air will leak from the inside of the gas storage reservoir to the outside along the cable core wire, so it is necessary to solve the leakage channel sealing between the sheath and the core wire of the monitoring cable. (2) When there are many monitoring cables in the gas storage reservoir, the monitoring cables are generally led out by pre-buried threading tubes in the plug. This pre-buried threading tube is a channel connecting the inside and outside of the gas storage reservoir, which is also prone to compressed air leakage. Therefore, the sealing of the lead-out pipeline when the cable is led out is a key problem that needs to be solved. However, the existing cable sealing devices for underground gas storage reservoirs have poor sealing effects and a narrow range of applications. Summary of the invention

[0004] The present invention provides a high-pressure underground gas storage cable lead-out sealing device and a construction method thereof, which can solve the problems of poor sealing effect and narrow application range of existing underground gas storage cable sealing devices.

[0005] In one aspect, the present invention provides a high-pressure underground gas storage cable lead-out sealing device, the device comprising:

[0006] A wire threading pipe is buried in the plug of the gas storage reservoir, one end of which is connected to the cavern of the gas storage reservoir, and the other end is located outside the gas storage reservoir, and is used to guide the cables inside the gas storage reservoir to the outside of the gas storage reservoir; the cables inside the gas storage reservoir have an exposed part with a bare wire core;

[0007] The sealing sleeve is sleeved on the exposed part of the cable, and comprises a first sleeve and a closing cover for closing two ends of the first sleeve, wherein the closing cover is sealed and connected to the unexposed part of the cable; the sealing sleeve is filled with a first sealing material;

[0008] A closed tube is sleeved outside the sealing sleeve, and one end of which is connected to the end of the threading tube; the closed tube includes a second sleeve and a rigid sealing structure for sealing the two ends of the second sleeve, the rigid sealing structure is sealed and connected to the unexposed part of the cable, and the closed tube is filled with a flexible sealing material.

[0009] Optionally, the closed tube is a tapered tube, the diameter of the narrowed end of the closed tube matches the diameter of the threading tube, and the narrowed end of the closed tube is connected to the end of the threading tube.

[0010] Optionally, the diameter of the expanded end of the closed tube is 1.2 to 1.5 times the diameter of the contracted end thereof.

[0011] Optionally, the rigid blocking structure in the closed tube near one end of the threading tube includes:

[0012] A sealing plate is fixed to the port of the second sleeve and is used to seal the port; a reserved hole for the cable to pass through is reserved on the sealing plate;

[0013] The sealing layer is laid on a side of the sealing plate away from the threading tube and is used for sealing the gap between the cable and the reserved hole.

[0014] Optionally, the rigid blocking structure in the closed tube away from one end of the threading tube is formed by solidifying a rigid sealing material.

[0015] Optionally, an annular rib is provided on the outer wall of the closed tube.

[0016] Optionally, the diameter of the sealing sleeve is greater than or equal to 3 times the diameter of the cable.

[0017] Optionally, the sealing plate is connected to the end of the threading tube via a flange.

[0018] On the other hand, the present invention provides a construction method of a cable lead-out sealing device for a high-pressure underground gas storage based on any one of the above-mentioned methods, the method comprising:

[0019] A sealing sleeve is provided on the exposed part of the cable;

[0020] A sealing tube is disposed outside the sealing sleeve;

[0021] One end of the cable is passed through a wire threading tube, and the necked end of the closed tube is connected to the end of the wire threading tube.

[0022] Optionally, a sealing tube is disposed outside the sealing sleeve, specifically comprising:

[0023] Pass the cable with the sealing sleeve through the reserved hole on the sealing plate, and lay a second sealing material on the inner side of the sealing plate to form a sealing layer;

[0024] injecting a flexible sealing material onto the sealing layer to fill the inner space of the closed tube;

[0025] A rigid sealing material is laid on top of the flexible sealing material to form a rigid sealing structure for sealing the expanded end of the closed tube.

[0026] The beneficial effects that the present invention can produce include:

[0027] The cable lead-out sealing device for a high-pressure underground gas storage provided by the present invention is provided with a sealing sleeve on the exposed part of the cable, and a closed tube is provided outside the sealing sleeve. The sealing sleeve can lead the high-pressure gas in the gas storage reservoir into the closed tube through the protective sleeve of the cable, and the high pressure in the protective sleeve of the cable makes the cable and the flexible sealing material filled in the closed tube closely contact to form a sealing system. The cable lead-out sealing device provided by the present invention is flexible to install and disassemble, has a clear and simple structure, is easy to operate, and has a wide range of applications, and can ensure the sealing effect of the cable under high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the vertical structure of a cable lead-out sealing device for a high-pressure underground gas storage provided by an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the structure of the middle A area;

[0030] Figure 3 A schematic diagram of the structure of a closed tube provided in an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of a flange plane structure provided in an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the three-dimensional structure of a flange provided in an embodiment of the present invention.

[0033] Reference numerals:

[0034] 1. Wire threading tube; 2. Plug; 3. Cable; 31. Protective cover; 32. Wire core; 4. Exposed part; 5. Sealing sleeve; 51. Closing cover; 6. First sealing material; 7. Closing tube; 8. Flexible sealing material; 9. Sealing plate; 10. Sealing layer; 11. Rigid sealing material; 12. Annular rib; 13. Flange; 14. Bolt hole; 15. Rubber gasket; 16. Reserved hole. DETAILED DESCRIPTION

[0035] The present invention is described in detail below in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0036] The embodiment of the present invention provides a high-pressure underground gas storage cable lead-out sealing device, such as Figures 1 to 5 As shown, the device comprises:

[0037] A threading pipe 1 is buried in a plug 2 of the gas storage reservoir, one end of which is connected to the cavern of the gas storage reservoir, and the other end is located outside the gas storage reservoir, and is used to guide the cable 3 inside the gas storage reservoir to the outside of the gas storage reservoir; the cable 3 located inside the gas storage reservoir has an exposed portion 4 with an exposed wire core 32;

[0038] The sealing sleeve 5 is sleeved on the exposed part 4 of the cable 3, and comprises a first sleeve and a closing cover 51 for closing two ends of the first sleeve, and the closing cover 51 is sealed and connected to the unexposed part of the cable 3; the sealing sleeve 5 is filled with a first sealing material 6;

[0039] The closed tube 7 is sleeved outside the sealing sleeve 5, and one end of which is connected to the end of the threading tube 1; the closed tube 7 includes a second sleeve and a rigid sealing structure for sealing the two ends of the second sleeve, the rigid sealing structure is sealed and connected to the unexposed part of the cable 3, and the closed tube 7 is filled with a flexible sealing material 8.

[0040] The diameter of the sealing sleeve 5 is greater than or equal to 3 times the diameter of the cable 3 .

[0041] The cable 3 used for monitoring is generally a three-core wire, and the three-core wire is protected by a protective sheath 31 to form a sheathed wire. After reserving a certain length of each cable 3 (generally the length from the closed tube 7 to the wiring part of the instrument), the protective sheath 31 of the cable 3 is peeled off for at least 3 cm, and the wire core 32 in the cable 3 is exposed to form an exposed part 4. A first sleeve is set on this exposed part 4. The material of the first sleeve can be an organic material. The diameter of the first sleeve is at least 3 times the diameter of the sheathed wire. The two ends of the first sleeve can be closed with a closed cover 51 made of plastic material to form a sealed sleeve 5. Holes are reserved on the closed cover 51 for the sheathed wire to pass through. In the present invention, the two ends of the sealed sleeve 5 are at least 3 cm longer than the exposed part 4 of the cable 3. The first sealing material 6 filled in the sealed sleeve 5 can be epoxy resin, and the sealed sleeve 5 is sealed with epoxy resin to close the leakage channel between the protective sleeve 31 and the wire core 32 of the cable 3. The purpose of setting the sealing sleeve 5 is to lead the high-pressure gas in the gas storage reservoir into the closed tube 7 through the protective sleeve 31 of the cable 3, and the high pressure in the protective sleeve 31 of the cable 3 makes the cable 3 and the flexible sealing material 8 filled in the closed tube 7 closely contact to form a sealing system.

[0042] In practical applications, the flexible sealing material 8 in the sealing tube 7 may be an organic silicon sealing material.

[0043] When high-pressure gas is injected into the gas storage, the interior of the protective sheath 31 of the cable 3 expands under the action of pressure and forms a sealing system after being in close contact with the organic silicon sealing material.

[0044] In the present invention, the closed tube 7 is a tapered tube, the diameter of the narrowed end of the closed tube 7 matches the diameter of the threading tube 1 , and the narrowed end of the closed tube 7 is connected to the end of the threading tube 1 .

[0045] The end of the closed tube 7 close to the threading tube 1 is the shrinking end of the closed tube 7, and the rigid blocking structure at the shrinking end includes:

[0046] A sealing plate 9 is fixed to the port of the second sleeve and is used to seal the port; a reserved hole 16 is reserved on the sealing plate 9 for the cable 3 to pass through;

[0047] The sealing layer 10 is laid on a side of the sealing plate 9 away from the threading tube 1 and is used to seal the gap between the cable 3 and the reserved hole 16 .

[0048] The sealing layer 10 may be formed by curing epoxy resin.

[0049] By providing the sealing layer 10 on the sealing plate 9, firstly, the strength of the sealing plate 9 is enhanced, thereby ensuring the stability of the flexible sealing material 8 filled in the sealing tube 7 under high pressure, so that it will not be squeezed into the pre-buried threading tube 1; secondly, the airtightness around the cable is enhanced.

[0050] The end of the closed tube 7 away from the threading tube 1 is the flared end of the closed tube 7, and the rigid sealing structure at the flared end is formed by curing the rigid sealing material 11. The rigid sealing material 11 can be epoxy resin.

[0051] The sealing plate 9 is connected to the end of the threading tube 1 through a flange 13 .

[0052] Specifically, the threading pipe 1 is generally a steel pipe, and a flange 13 is provided at the end of the steel pipe (close to the gas storage reservoir side), and the flange 13 is firmly welded to the embedded threading pipe 1, and a screw rod is fixed on the flange 13. The purpose of providing the flange 13 is to effectively connect the embedded threading pipe 1 and the closed pipe 7. The embedded threading pipe 1 is buried in the concrete plug 2 of the gas storage reservoir, and the outer surface of the flange 13 is flush with the concrete surface of the plug 2 on the gas storage reservoir side, and the screw rod fixed on the flange 13 protrudes from the concrete surface.

[0053] The closed tube 7 is a conical tube made of steel, and the diameter of the narrowed end is the same as the diameter of the pre-buried threading tube 1. Preferably, the diameter of the expanded end of the closed tube 7 is 1.2 to 1.5 times the diameter of the narrowed end. The advantages of setting the closed tube 7 as a conical tube are: first, it is easy to fill the sealing filler; second, the sealing filler can be tightly squeezed on the side wall, which is conducive to the sealing of the high-pressure gas in the gas storage; third, when there are many monitoring cables 3 drawn out, the sealing effect can be increased.

[0054] refer to Figure 3 As shown, a sealing plate 9 is provided at the constricted end of the closed tube 7. The sealing plate 9 may be a steel plate. Several reserved holes 16 are reserved on the sealing plate 9. The total opening area of ​​the reserved holes 16 is not greater than half of the cross-sectional area of ​​the sealing plate 9. The main purpose of providing the sealing plate 9 is to facilitate the passage of the cable while ensuring that the filling sealing filler is not squeezed into the pre-buried threading tube 1 under the action of the high pressure in the gas storage reservoir.

[0055] A flange 13 is provided at the sealing plate 9 of the sealing tube 7, and the sealing plate 9 and the flange 13 are firmly welded to the sealing tube 7 to ensure airtightness. The flange 13 and the bolt holes 14 thereon correspond to the flange 13 and the fixing screw rod on the embedded threading tube 1.

[0056] Furthermore, an annular rib 12 is provided on the outer wall of the closed tube 7 .

[0057] By arranging 1-2 annular ribs 12 on the outside of the closed tube 7, the ability of the closed tube 7 to resist external pressure can be increased, and the structural stability can be increased.

[0058] Another embodiment of the present invention provides a construction method based on any one of the above-mentioned high-pressure underground gas storage cable lead-out sealing devices, the method comprising:

[0059] S1. A sealing sleeve 5 is sleeved on the exposed portion 4 of the cable 3.

[0060] S2. A sealing tube 7 is disposed outside the sealing sleeve 5.

[0061] Specifically include:

[0062] (1) The cable 3 with the sealing sleeve 5 is passed through the reserved hole 16 on the sealing plate 9, and a second sealing material is laid on the inner side of the sealing plate 9 to form a sealing layer 10.

[0063] Specifically, the cable 3 with the sealing sleeve 5 is passed through the sealing plate 9 provided at the constricted end of the sealing tube 7, and epoxy resin with a minimum thickness of 1 cm is injected into the inner side of the sealing plate 9 to form a sealing layer 10. During the process of injecting the epoxy resin, each cable 3 needs to be separated so that the epoxy resin is fully filled between the cables.

[0064] (2) The flexible sealing material 8 is injected onto the sealing layer 10 to fill the inner space of the closed tube 7 .

[0065] A flexible sealing material 8 of a certain thickness is injected onto the sealing layer 10 . The flexible sealing material 8 can be silicone. The thickness of the flexible sealing material 8 should cover the newly added sealing sleeve 5 on the cable 3 and should be at least 10 cm higher than the sealing sleeve 5 .

[0066] (3) A rigid sealing material 11 is laid on top of the flexible sealing material 8 to form a rigid sealing structure for sealing the expanded end of the sealing tube 7.

[0067] A layer of epoxy seal is laid on the top of the organic silicon seal to form a rigid sealing structure for sealing the flared end of the sealing tube 7 . The height formed by the epoxy seal is the same as the height of the sealing tube 7 .

[0068] S3, passing one end of the cable 3 through the threading tube 1, and connecting the shrinking end of the closing tube 7 to the end of the threading tube 1.

[0069] After the sealing of the closing tube 7 is completed, the other end of the cable 3 is passed through the pre-buried threading tube 1, and the flange 13 at the shrinking end of the closing tube 7 is tightly connected with the flange 13 on the threading tube 1 through a fixing screw rod, and a rubber gasket 15 is added between the two flanges 13 to enhance the sealing of the flange 13 and prevent air leakage.

[0070] The cable lead-out sealing device for a high-pressure underground gas storage provided by the present invention is provided with a sealing sleeve 5 on the exposed portion 4 of the cable 3, and a closed tube 7 is provided outside the sealing sleeve 5. The sealing sleeve 5 can lead the high-pressure gas in the gas storage reservoir into the closed tube 7 through the protective sleeve 31 of the cable 3, and the high pressure in the protective sleeve 31 of the cable 3 makes the cable 3 and the flexible sealing material 8 filled in the closed tube 7 closely contact to form a sealing system. The cable 3 lead-out sealing device provided by the present invention is flexible to install and disassemble, has a clear and simple structure, is easy to operate, and has a wide range of applications, and can ensure the sealing effect of the cable 3 under high pressure.

[0071] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A cable lead-out sealing device for a high-pressure underground gas storage reservoir, characterized in that: The device comprises: A wire threading pipe is buried in the plug of the gas storage reservoir, one end of which is connected to the cavern of the gas storage reservoir, and the other end is located outside the gas storage reservoir, and is used to guide the cables inside the gas storage reservoir to the outside of the gas storage reservoir; the cables inside the gas storage reservoir have an exposed part with a bare wire core; The sealing sleeve is sleeved on the exposed part of the cable, and comprises a first sleeve and a closing cover for closing two ends of the first sleeve, wherein the closing cover is sealed and connected to the unexposed part of the cable; the sealing sleeve is filled with a first sealing material; A closed tube is sleeved outside the sealing sleeve, and one end of which is connected to the end of the threading tube; the closed tube includes a second sleeve and a rigid sealing structure for sealing the two ends of the second sleeve, the rigid sealing structure is sealed and connected to the unexposed part of the cable, and the closed tube is filled with a flexible sealing material.

2. The device according to claim 1, characterized in that The closed tube is a tapered tube, the diameter of the constricted end of the closed tube matches the diameter of the threading tube, and the constricted end of the closed tube is connected to the end of the threading tube.

3. The device according to claim 2, characterized in that The diameter of the expanded end of the closed tube is 1.2 to 1.5 times the diameter of the contracted end.

4. The device according to claim 1, characterized in that The rigid blocking structure in the closed tube near one end of the threading tube comprises: A sealing plate is fixed to the port of the second sleeve and is used to seal the port; a reserved hole for the cable to pass through is reserved on the sealing plate; The sealing layer is laid on a side of the sealing plate away from the threading tube and is used for sealing the gap between the cable and the reserved hole.

5. The device according to claim 1, characterized in that The rigid blocking structure in the closed tube away from one end of the threading tube is formed by solidifying the rigid sealing material.

6. The device according to claim 1, characterized in that An annular rib is arranged on the outer wall of the closed tube.

7. The device according to claim 1, characterized in that The diameter of the sealing sleeve is greater than or equal to 3 times the diameter of the cable.

8. The device according to claim 4, characterized in that The sealing plate is connected to the end of the threading tube through a flange.

9. A construction method for a cable lead-out sealing device for a high-pressure underground gas storage based on any one of claims 1 to 8, characterized in that: The method comprises: A sealing sleeve is provided on the exposed part of the cable; A sealing tube is disposed outside the sealing sleeve; One end of the cable is passed through a wire threading tube, and the necked end of the closed tube is connected to the end of the wire threading tube.

10. The method according to claim 9, characterized in that A sealing tube is arranged outside the sealing sleeve, which specifically comprises: Pass the cable with the sealing sleeve through the reserved hole on the sealing plate, and lay a second sealing material on the inner side of the sealing plate to form a sealing layer; injecting a flexible sealing material onto the sealing layer to fill the inner space of the closed tube; A rigid sealing material is laid on top of the flexible sealing material to form a rigid sealing structure for sealing the expanded end of the closed tube.

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