Self-drainage system suitable for underground high-pressure gas storage chamber

Abstract

The utility model provides a self-drainage system suitable for an underground high-pressure gas storage chamber, which comprises a steel plugging head, an electric control hydraulic jack used for providing jacking power is arranged right below the steel plugging head, and the electric control hydraulic jack is arranged in a water collecting tank; a concrete lining is filled between the underground chamber closed cylindrical steel lining and the natural surrounding rock, plugging holes are formed in the positions, where the steel plugging heads are located, of the underground chamber closed cylindrical steel lining and the concrete lining, sealing layers are arranged on the outer surfaces of the plugging holes, and the side face of the bottom of the water collecting tank communicates with a drainage pipeline. The system can effectively discharge condensate water generated by high and low air pressure difference and temperature difference on the premise of ensuring the air tightness of the underground chamber, and is durable, simple to construct and convenient to operate.

Description

Technical Field

[0001] The utility model relates to a self-draining system suitable for an underground high-pressure gas storage chamber, belonging to the technical field of underground high-pressure gas storage chambers. Background Art

[0002] High-pressure gas storage is a new type of energy storage method. Its chambers are typically located in rock formations 100 meters below the surface, subject to extremely high gas pressures, typically 10 to 20 MPa. Therefore, high-pressure gas storage places particularly high demands on gas sealing. Deep underground high-pressure gas storage chambers are the core structures of air compression energy storage systems. The airtightness of the underground chambers is key to ensuring the energy conversion efficiency of air storage. During operation, the temperature fluctuations caused by the high and low pressure differences within the chambers range from -30°C to 70°C, causing a large amount of condensate to accumulate within the chambers. However, in the closed and high-pressure underground environment, condensate is difficult to drain away by self-flow or evaporation, and it is also difficult to pump out. Utility Model Content

[0003] The purpose of this utility model is to provide a self-draining system suitable for underground high-pressure gas storage chambers. This system can effectively discharge condensed water generated by high and low pressure differences and temperature differences while ensuring the air tightness of the underground chamber. It is durable, simple to construct, and easy to operate.

[0004] In order to achieve the above-mentioned technical features, the purpose of the utility model is achieved as follows: a self-drainage system suitable for an underground high-pressure gas storage chamber, comprising a steel sealing head, an electro-hydraulic jack for providing jacking power is arranged directly below the steel sealing head, and the electro-hydraulic jack is installed inside the water collection tank; a concrete lining is filled between the closed cylindrical steel lining of the underground chamber and the natural surrounding rock, and a sealing hole is provided on the closed cylindrical steel lining of the underground chamber and the concrete lining and at the position of the steel sealing head, a sealing layer is provided on the outer surface of the sealing hole, and a drainage pipe is connected to the bottom side of the water collection tank.

[0005] The steel plugging head is prefabricated in a factory using steel materials, and a single piece of the steel plugging head is in the shape of a truncated cone.

[0006] Multiple groups of high-performance springs are evenly welded and fixed on the side of the steel plugging head. The high-performance springs are installed inside the spring groove, and the spring groove is set inside the concrete lining.

[0007] The axis of the high-performance spring is arranged perpendicularly to the side of the lower cone of the steel plugging head.

[0008] The sealing layer is coated with a high molecular weight butyl rubber material.

[0009] The enclosed cylindrical steel lining of the underground chamber is made of factory prefabricated steel plates spliced ​​on site, arranged around the chamber, and fully welded between the steel plates.

[0010] The natural surrounding rock is Class II or Class I surrounding rock, has no developed cracks, good integrity and high compressive strength.

[0011] The concrete lining is large-area cast-in-place C40 self-compacting concrete.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The utility model uses the pressure difference between the chamber space and the outside to drain water, effectively solving the drainage problem in the high-pressure environment of the underground gas storage chamber, increasing the actual storage capacity of the chamber, and indirectly improving the energy storage efficiency.

[0014] 2. The utility model effectively ensures the air tightness of the chamber whether in the drainage process or in the non-drainage period by arranging the steel plugging head and the polymer material.

[0015] 3. The utility model uses an electronically controlled hydraulic jack to select the drainage time, which is simple to operate and convenient to use.

[0016] 4. The utility model ensures its structural strength and stability through the above-mentioned steel plugging head.

[0017] 5. Multiple sets of high-performance springs can be used to elastically support the steel plugging head.

[0018] 6. Due to the large area of ​​the underground chamber, it is necessary to pour in batches and sections to prevent local void areas from appearing in the concrete lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for use in the embodiments.

[0020] Figure 1 It is a schematic diagram of the overall structure of the high-pressure gas storage chamber of the utility model.

[0021] Figure 2 This utility model Figure 1 Medium AA view.

[0022] Figure 3 This utility model Figure 1 Middle BB view.

[0023] In the figure: high-performance spring 1, electric-controlled hydraulic jack 2, steel plugging head 3, underground chamber closed cylindrical steel lining 4, concrete lining 5, spring groove 6, sealing layer 7, natural surrounding rock 8, drainage pipe 9, plugging hole 10, and water collection tank 11. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example 1:

[0026] See also Figure 1-3 A self-draining system for underground high-pressure gas storage chambers includes a steel plugging head 3, directly below which is located an electro-hydraulic jack 2 for providing lifting power, and inside a water collection tank 11 in which the electro-hydraulic jack 2 is installed. A concrete lining 5 is filled between the underground chamber's sealed cylindrical steel liner 4 and the natural surrounding rock 8. A plugging hole 10 is provided on the underground chamber's sealed cylindrical steel liner 4 and the concrete lining 5, and located at the location of the steel plugging head 3. The outer surface of the plugging hole 10 is provided with a sealing layer 7. A drainage pipe 9 is connected to the bottom side of the water collection tank 11. This system can effectively drain condensed water generated by high and low pressure and temperature differences while ensuring the airtightness of the underground chamber. It is durable, simple to construct, and easy to operate. During specific use, when it is necessary to discharge the condensed water, the opening or closing of the steel sealing head 3 is controlled by the electric-controlled hydraulic jack 2 to discharge the collected water inside the closed cylindrical steel lining 4 of the underground chamber from the sealing hole 10 to the water collecting tank 11, and then discharged from the water collecting tank 11 and the drainage pipe 9.

[0027] Furthermore, the steel plugging head 3 is prefabricated in a factory using steel, and the single steel plugging head 3 is in a truncated cone shape. The steel plugging head 3 ensures its structural strength and stability.

[0028] Preferably, the upper bottom surface diameter of the steel plugging head 3 is 1000 mm, the lower bottom surface diameter is 500 mm, and the height is 350 mm.

[0029] Furthermore, multiple sets of high-performance springs 1 are uniformly welded and fixed to the sides of the steel plugging head 3. The high-performance springs 1 are installed inside the spring slots 6, which are arranged inside the concrete lining 5. The use of multiple sets of high-performance springs 1 can be used to elastically support the steel plugging head 3.

[0030] Preferably, the high performance spring 1 has a length of 300 mm.

[0031] Furthermore, the axis of the high-performance spring 1 is arranged perpendicularly to the side of the lower cone of the steel plugging head 3 .

[0032] Preferably, the specification of the electronically controlled hydraulic jack 2 is an 80t small hydraulic jack.

[0033] Furthermore, the sealing layer 7 is coated with a high molecular weight butyl rubber material. The sealing strip is glued to the sides of the closed cylindrical steel lining 4 and the concrete lining 5 of the underground chamber using epoxy resin primer, and has a thickness of 25 mm.

[0034] Furthermore, the sealed cylindrical steel lining 4 of the underground chamber is made of factory-prefabricated steel plates spliced ​​on-site, arranged around the chamber, and fully welded between the steel plates.

[0035] Preferably, an arc-shaped steel plate with a length of 7 meters, a width of 3 meters and a thickness of 15 mm is used to make a closed cylindrical steel lining 4 of the underground chamber.

[0036] Furthermore, the natural surrounding rock 8 is Class II or Class I surrounding rock, has no developed cracks, good integrity, and high compressive strength.

[0037] Furthermore, the concrete lining 5 is a large-area cast-in-place C40 self-compacting concrete, and uses pozzolana cement with good airtightness.

[0038] Preferably, the concrete lining 5 is provided with transverse and longitudinal reinforcement. During pouring, sufficient space must be filled between the underground chamber's sealed cylindrical steel lining 4 and the natural surrounding rock 8 to ensure that the concrete lining 5 can evenly transfer loads, thereby effectively ensuring the structural stability of the underground chamber's sealed cylindrical steel lining 4. Furthermore, due to the large area of ​​the underground chamber, pouring must be carried out in batches and sections to prevent the formation of localized voids in the concrete lining 5.

[0039] Preferably, the longitudinal reinforcement and the transverse reinforcement inside the concrete lining 5 are arranged in φ18@250.

[0040] Preferably, a water collection trough needs to be arranged at the bottom of the concrete lining 5. The water collection trough is arranged on the outermost closed cylindrical steel lining 4 of the underground chamber and close to the bottom of the construction access road. The water collection trough hole of the arc-shaped steel plate is reserved during prefabrication in the factory.

[0041] Preferably, the drainage pipe 9 is embedded in the concrete lining 5 before concrete pouring, and the diameter of the drainage pipe 9 is 50 mm.

[0042] Example 2:

[0043] A construction method for a self-draining system of an underground high-pressure gas storage chamber comprises the following steps:

[0044] Step 1: Prefabrication of the steel plug 3 and the high-performance spring 1:

[0045] In the factory, the steel plugging head 3 and the high-performance spring 1 are first processed and formed, and then the steel plugging head 3 and the high-performance spring 1 are welded;

[0046] Step 2: Prefabrication of the underground chamber's sealed cylindrical steel lining and four curved steel plates:

[0047] In the factory, the steel plates are made into curved steel plates for on-site splicing; one steel plate is reserved as the steel plate for arranging the drainage trough, and the drainage trough holes need to be reserved on this steel plate;

[0048] Step 3: Excavation of gas storage chamber:

[0049] A gas storage chamber is excavated in the Class II or Class I natural surrounding rock 8, and the chamber is excavated into a tunnel. After the excavation of the entire chamber is completed, an area for a water collection trough 11 is excavated. The water collection trough 11 is arranged near the maintenance passage. The water collection trough is first excavated to the depth of the reserved drainage pipe 9 and is divided into an upper part and a lower part. The upper part of the water collection trough is frustum-shaped. After excavation, spring grooves 6 are further excavated on all four sides. The pre-buried drainage pipe 9 is located at the bottom of the water collection trough 11.

[0050] Step 4: Transportation and installation of the sealed cylindrical steel lining 4 of the underground chamber:

[0051] Use transportation equipment to transport a single curved steel plate to the site. After all components are transported to the site, the curved steel plates are first assembled and spliced ​​on site. After multiple curved steel plates are spliced ​​into a cylindrical shape to form the main body of the sealed cylindrical steel lining 4 of the underground chamber, full welding is used to fill the welds between the curved steel plates to ensure the airtightness of the sealed cylindrical steel lining 4 of the underground chamber; in the area where the water collection tank 11 is laid, the drainage trough holes reserved in the steel plate must be aligned with the holes drilled in the water collection tank;

[0052] Step 5: pouring of concrete lining 5 and laying of drainage pipes:

[0053] After the arc-shaped steel plate is welded, the underground chamber closed cylindrical steel lining 4 is formed. Self-compacting concrete is poured layer by layer on the outer side of the underground chamber closed cylindrical steel lining 4 in the order of lower layer first and upper layer later, so that the steel mesh is buried in the concrete lining 5, and it is ensured that the space between the underground chamber closed cylindrical steel lining 4 and the concrete layer is fully filled so that the concrete layer can evenly transfer the load;

[0054] Step 6: Installation of steel plug 3:

[0055] After the concrete lining 5 is poured, the electric-controlled hydraulic jack 2 is arranged at the bottom of the water collection tank 11, and the lifting platform of the electric-controlled hydraulic jack 2 is aligned with the bottom surface of the steel plug 3. At the same time, plain concrete is poured in the reserved spring groove 6. Before the concrete initially sets, the tail of the high-performance spring 1 is buried in the plain concrete. After the concrete is finally set, the high-performance spring 1 is flexibly connected to the natural surrounding rock 8.

[0056] Step 7: Setting of sealing layer 7:

[0057] After the high-performance spring 1 is installed, epoxy resin primer and butyl rubber sealing strips are used to bond the sides of the closed cylindrical steel lining 4 and the concrete lining 5 of the underground chamber to form a sealing layer 7 to ensure the airtightness of the drainage system when it is not opened.

[0058] Example 3:

[0059] A method for using a self-draining system for an underground high-pressure gas storage chamber comprises the following steps:

[0060] Use of electronically controlled hydraulic jack 2:

[0061] The drainage system controls the opening and closing of the plugging hole by raising and lowering the electro-hydraulic jack 2. The electronic control system of the electro-hydraulic jack 2 is set in the maintenance channel. The maintenance staff controls the electro-hydraulic jack 2 to lift and open the plugging hole 10. During the opening of the plugging hole, the condensed water will be discharged by itself due to the pressure difference between the air pressure in the gas storage chamber and the outside air pressure. After no water is discharged, the maintenance staff controls the electro-hydraulic jack 2 to lower the steel plugging head 3 to close the plugging hole.

[0062] Drainage system service life:

[0063] The drainage system requires maintenance personnel to drain condensate once a month;

[0064] Drainage system use conditions:

[0065] During the operation of the underground gas storage chamber, the air pressure in the chamber circulates between 10-20MPa, and the drainage system is opened when the air pressure in the chamber reaches 10~14MPa.

[0066] By opening the valve when the air pressure in the chamber is relatively low, the opening pressure is reduced, thereby extending the service life.

[0067] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A self-draining system for underground high-pressure gas storage chambers, characterized by: The invention comprises a steel plugging head (3), an electric-controlled hydraulic jack (2) for providing lifting power is arranged directly below the steel plugging head (3), and the electric-controlled hydraulic jack (2) is installed inside a water collecting tank (11); a concrete lining (5) is filled between the sealed cylindrical steel lining (4) of the underground chamber and the natural surrounding rock (8); a plugging hole (10) is provided on the sealed cylindrical steel lining (4) of the underground chamber and the concrete lining (5) and located at the position of the steel plugging head (3); a sealing layer (7) is provided on the outer surface of the plugging hole (10); and a drainage pipe (9) is connected to the bottom side of the water collecting tank (11).

2. The self-draining system for an underground high-pressure gas storage chamber according to claim 1, characterized in that: The steel plugging head (3) is prefabricated in a factory using steel, and a single piece of the steel plugging head (3) is in the shape of a truncated cone.

3. The self-draining system for an underground high-pressure gas storage chamber according to claim 2, characterized in that: Multiple groups of high-performance springs (1) are uniformly welded and fixed to the side of the steel plug (3), and the high-performance springs (1) are installed inside the spring groove (6), and the spring groove (6) is set inside the concrete lining (5).

4. The self-draining system for an underground high-pressure gas storage chamber according to claim 3, characterized in that: The axis of the high-performance spring (1) is arranged perpendicularly to the side of the lower cone of the steel plugging head (3).

5. The self-draining system for an underground high-pressure gas storage chamber according to claim 3, characterized in that: The sealing layer (7) is coated with a high molecular weight butyl rubber material.

6. The self-draining system for an underground high-pressure gas storage chamber according to claim 3, characterized in that: The sealed cylindrical steel lining (4) of the underground chamber is made of factory prefabricated steel plates spliced ​​together on site, arranged around the chamber, and fully welded between the steel plates.

7. The self-draining system for an underground high-pressure gas storage chamber according to claim 3, characterized in that: The natural surrounding rock (8) is a Class II or Class I surrounding rock, has no developed cracks, good integrity, and high compressive strength.

8. The self-draining system for an underground high-pressure gas storage chamber according to claim 3, characterized in that: The concrete lining (5) is large-area cast-in-place C40 self-compacting concrete.

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