A high-pressure underground gas storage cable lead-out sealing device and its construction method

Abstract

The present invention discloses a high-pressure underground gas storage cable lead-out sealing device and its construction method, belonging to the technical field of underground gas storage, which can solve the problem of poor sealing effect of the existing underground gas storage cable sealing device. The device includes: a conduit, buried in the plug of the gas storage; an exposed part with an exposed wire core on the cable located inside the gas storage; a sealing sleeve, sleeved on the exposed part of the cable, which includes a first sleeve and a closing cover for closing both ends of the first sleeve, and the closing covers are both sealingly connected to the unexposed part of the cable; a first sealing material is filled in the sealing sleeve; a closing pipe, sleeved outside the sealing sleeve, one end of which is connected to the end of the conduit; the closing pipe includes a second sleeve and a rigid plugging structure for plugging both ends of the second sleeve, the rigid plugging structure is sealingly connected to the unexposed part of the cable, and a flexible sealing material is filled in the closing pipe. The present invention is used for the cable lead-out sealing device of 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] A sealed sleeve is sleeved on the exposed part of the cable. It includes a first sleeve and a sealing cover for closing both ends of the first sleeve. The sealing covers are both hermetically connected to the unexposed part of the cable. The sealed sleeve is filled with a first sealing material.

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

[0009] Optionally, the closed tube is a conical tube. The diameter of the reduced end of the closed tube matches the diameter of the threading tube, and the reduced end of the closed tube is connected to the end of the threading tube.

[0010] Optionally, the diameter of the flared end of the closed tube is 1.2 to 1.5 times the diameter of its reduced end.

[0011] Optionally, the rigid plugging structure at the end of the closed tube close to the threading tube includes:

[0012] A sealing plate is fixed at the port of the second sleeve to close the port. A reserved hole for the cable to pass through is reserved on the sealing plate.

[0013] A sealing layer is laid on the side of the sealing plate away from the threading tube to seal the gap between the cable and the reserved hole.

[0014] Optionally, the rigid plugging structure at the end of the closed tube far from the threading tube is formed by curing with a rigid sealing material.

[0015] Optionally, annular rib plates are arranged on the outer wall of the closed tube.

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

[0017] Optionally, the sealing plate and the end of the threading tube are connected by a flange.

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

[0019] Sleeving a sealed sleeve on the exposed part of the cable;

[0020] Sleeving a closed tube outside the sealed sleeve;

[0021] Passing one end of the cable through the threading tube and connecting the reduced end of the closed tube to the end of the threading tube.

[0022] Optionally, a closed tube is sleeved outside the sealed sleeve, specifically including:

[0023] Thread the cable sleeved with the sealed sleeve through the reserved hole on the sealing plate, and lay a second sealing material inside the sealing plate to form a sealing layer;

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

[0025] Lay a rigid sealing material on top of the flexible sealing material to form a rigid plugging structure for plugging the flared end of the closed tube.

[0026] The beneficial effects that can be produced by the present invention include:

[0027] The high-pressure underground gas storage cable lead-out sealing device provided by the present invention sleevs a sealed sleeve on the exposed part of the cable and sleevs a closed tube outside the sealed sleeve. The sealed sleeve can lead the high-pressure gas in the gas storage into the closed tube through the cable protection sleeve, and the high pressure in the cable protection sleeve makes the cable and the flexible sealing material filled in the closed tube in close contact to form a sealing system. The cable lead-out sealing device provided by the present invention is flexible in installation and disassembly, has a clear and simple structure, is convenient to operate, and has a wide application range, and can ensure the cable sealing effect under high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 2 For Figure 1 The structural diagram of area A in

[0030] Figure 3 It is a schematic structure diagram of the closed tube provided by the embodiment of the present invention;

[0031] Figure 4 It is a schematic plan structure diagram of the flange provided by the embodiment of the present invention;

[0032] Figure 5 It is a schematic three-dimensional structure diagram of the flange provided by the embodiment of the present invention.

[0033] Reference signs:

[0034] 1, threading pipe; 2, plug; 3, cable; 31, protective sleeve; 32, core; 4, exposed part; 5, sealed sleeve; 51, closed cover; 6, first sealing material; 7, closed 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 OF THE INVENTION

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

[0036] An embodiment of the present invention provides a cable lead-out sealing device for a high-pressure underground gas storage reservoir, as Figures 1 to 5 shown, the device includes:

[0037] A conduit 1 is buried in a plug 2 of the gas storage reservoir, one end of which is communicated with the chamber 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; there is an exposed part 4 with an exposed wire core 32 on the cable 3 located inside the gas storage reservoir;

[0038] A sealing sleeve 5 is sleeved on the exposed part 4 of the cable 3, and it includes a first sleeve and a closing cover 51 for closing both ends of the first sleeve. The closing cover 51 is hermetically connected to the unexposed part of the cable 3; the sealing sleeve 5 is filled with a first sealing material 6;

[0039] A closing tube 7 is sleeved outside the sealing sleeve 5, and one end of it is connected to the end of the conduit 1; the closing tube 7 includes a second sleeve and a rigid plugging structure for plugging both ends of the second sleeve. The rigid plugging structure is hermetically connected to the unexposed part of the cable 3, and the closing tube 7 is filled with a flexible sealing material 8.

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

[0041] The monitoring cable 3 is generally a three-core cable, and the outside of the three-core cable is protected by a protective sleeve 31 to form a sheathed cable. After leaving a certain length for each cable 3 (generally the length from the closing tube 7 to the instrument wiring part), the protective sleeve 31 of the cable 3 is peeled off by at least 3 cm, and the wire core 32 inside the cable 3 is exposed to form an exposed part 4. A first sleeve is sleeved 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 cable. Both ends of the first sleeve can be closed by a closing cover 51 made of plastic material to form a sealing sleeve 5. A hole for the sheathed cable to pass through is reserved on the closing cover 51. In the present invention, both ends of the sealing 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 sealing sleeve 5 can be epoxy resin, and the sealing sleeve 5 is sealed with epoxy resin to close the air 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 closing tube 7 through the protective sleeve 31 of the cable 3, and make the flexible sealing material 8 filled in the cable 3 and the closing tube 7 in close contact through the high pressure in the protective sleeve 31 of the cable 3 to form a sealing system.

[0042] In practical applications, the flexible sealing material 8 in the closing tube 7 can be a silicone sealing material.

[0043] When high-pressure gas is injected into the gas storage reservoir, the inside of the protective sleeve 31 of the cable 3 will expand under pressure and form a sealing system after being in close contact with the silicone sealant material.

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

[0045] One end of the closed tube 7 close to the threading tube 1 is the reduced end of the closed tube 7. The rigid plugging structure at the reduced end includes:

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

[0047] A sealing layer 10, laid on the side of the sealing plate 9 away from the threading tube 1, for sealing the gap between the cable 3 and the reserved hole 16.

[0048] The above-mentioned sealing layer 10 can be formed by curing epoxy resin.

[0049] By arranging the sealing layer 10 on the sealing plate 9, firstly, the strength of the sealing plate 9 is enhanced, ensuring the stability of the flexible sealing material 8 filled in the closed tube 7 under high pressure and preventing it from being squeezed into the embedded threading tube 1; secondly, the airtightness around the cable is enhanced.

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

[0051] The sealing plate 9 and the end of the threading tube 1 are connected by a flange 13.

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

[0053] The closed tube 7 is a conical tube made of steel. The diameter of the reduced end is the same as the diameter of the embedded threading tube 1. Preferably, the diameter of the flared end of the closed tube 7 is 1.2 times to 1.5 times the diameter of its reduced end. The advantages of setting the closed tube 7 as a conical tube are: firstly, it is convenient to fill the sealing filler; secondly, the sealing filler can be tightly squeezed on the side wall, which is beneficial to the sealing of the high-pressure gas in the gas storage reservoir; thirdly, when there are more monitoring cables 3 led out, the sealing effect can be increased.

[0054] Reference Figure 3 As shown, a sealing plate 9 is provided at the necked end of the closed tube 7. The sealing plate 9 can be a steel plate, and 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 setting the sealing plate 9 is to facilitate the passing of cables while ensuring that the filling and sealing filler will not be squeezed into the embedded conduit 1 under the high pressure in the gas storage reservoir.

[0055] A flange 13 is provided at the sealing plate 9 of the closed tube 7. The sealing plate 9 and the flange 13 are both firmly welded to the closed tube 7 to ensure no air leakage. The flange 13 and the bolt holes 14 thereon correspond to the flange 13 and the fixing screw rods on the embedded conduit 1.

[0056] Furthermore, a circular rib plate 12 is provided on the outer wall of the closed tube 7.

[0057] By providing 1 - 2 circular rib plates 12 on the outside of the closed tube 7, the external pressure resistance of the closed tube 7 can be increased, and the structural stability can be enhanced.

[0058] Another embodiment of the present invention provides a construction method for a cable lead - out sealing device for a high - pressure underground gas storage reservoir based on any one of the above, and the method includes:

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

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

[0061] Specifically, it includes:

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

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

[0064] (2) A flexible sealing material 8 is injected on the sealing layer 10 to fill the internal space of the closed tube 7.

[0065] A certain thickness of flexible sealing material 8 is injected on 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 be not less than 10 cm higher than the sealing sleeve 5.

[0066] (3) Lay a rigid sealing material 11 on top of the flexible sealing material 8 to form a rigid sealing structure for plugging the flared end of the closed tube 7.

[0067] Lay a layer of epoxy seal on top of the silicone seal to form a rigid sealing structure for plugging the flared end of the closed tube 7. The height formed by the epoxy seal is the same as the height of the closed tube 7.

[0068] S3. Pass one end of the cable 3 through the cable conduit 1, and connect the reduced-diameter end of the closed tube 7 to the end of the cable conduit 1.

[0069] After the sealing of the closed tube 7 is completed, pass the other end of the cable 3 through the pre-buried cable conduit 1, and tightly connect the flange 13 at the reduced-diameter end of the closed tube 7 to the flange 13 on the cable conduit 1 through the fixing screw rod. Moreover, add a rubber gasket 15 between the two flanges 13 to enhance the sealing performance of the flange 13 and prevent air leakage.

[0070] The high-pressure underground gas storage cable lead-out sealing device provided by the present invention slews a sealing sleeve 5 on the exposed part 4 of the cable 3, and slews a closed tube 7 outside the sealing sleeve 5. The sealing sleeve 5 can lead the high-pressure gas in the gas storage into the closed tube 7 through the protective sleeve 31 of the cable 3. The high pressure in the protective sleeve 31 of the cable 3 makes the flexible sealing material 8 filled in the cable 3 and the closed tube 7 in close contact to form a sealing system. The cable 3 lead-out sealing device provided by the present invention is flexible in installation and disassembly, has a clear and simple structure, is convenient to operate, and has a wide application range, and can ensure the sealing effect of the cable 3 under high pressure.

[0071] The above are only several embodiments of the present application, and do not impose any form of limitation on the present application. Although the present application is disclosed above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art, without departing from the scope of the technical solution of the present application, makes some changes or modifications using the technical content disclosed above, which are all equivalent to equivalent implementation cases and all 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 the closed tube is connected to the end of the threading tube; the closed tube includes a second sleeve and a rigid blocking structure for blocking two ends of the second sleeve, the rigid blocking structure is sealed and connected to the unexposed part of the cable, and the closed tube is filled with a flexible sealing material; 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.

2. The device according to claim 1, 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.

3. 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.

4. 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.

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

6. 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.

7. The device according to claim 3, characterized in that The sealing plate is connected to the end of the threading tube through a flange.

8. A construction method for the cable lead-out sealing device for a high-pressure underground gas storage based on any one of claims 1 to 7, 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.

9. The method according to claim 8, 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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