Reconstructed gas storage tunnel based on abandoned chamber of hydropower station

Abstract

The utility model discloses a gas storage tunnel transformed based on a waste chamber of a hydropower station, which belongs to the technical field of underground energy storage and comprises a backfill concrete layer, a reinforced concrete lining and a flexible concrete sealing layer which are sequentially poured on a surrounding rock of a chamber wall, and the cross section of the inner wall of the backfill concrete layer is circular. A plurality of water drainage floral tubes are arranged on the inner wall of the chamber at intervals in the circumferential direction of the chamber, the length direction of the water drainage floral tubes is consistent with the length direction of the chamber, the water drainage floral tubes penetrate through the two ends of the whole chamber, and a plurality of through holes are evenly distributed in the wall of each water drainage floral tube. During operation, the air tightness of the gas storage tunnel can be fed back through the exhaust condition in the drainage floral tube, meanwhile, external pressure water can be collected and discharged through the drainage floral tube, and damage to a lining of the gas storage tunnel is avoided; the flexible concrete sealing layer not only can adapt to deformation of the inner wall of the chamber caused by internal air pressure, but also can play a sealing role, so that the abandoned chamber of the hydropower station can be used as an underground gas storage of a compressed air energy storage power station.

Description

Technical Field

[0001] The utility model relates to the technical field of underground energy storage, and in particular to a gas storage tunnel based on the transformation of an abandoned chamber of a hydropower station. Background Art

[0002] Underground gas storage facilities in compressed air energy storage power plants are typically located deep within mountains. During periods of low electricity demand, surplus electricity is used to drive a compressor, compressing air and storing it in the reservoir. During peak periods, the air is discharged to generate electricity. Underground gas storage requires a high degree of sealing. To achieve this, abandoned salt caverns after salt mining are typically used as underground gas storage, or newly excavated underground chambers are sealed with steel linings. However, these conventional approaches require high geological conditions or high cost of sealing structures. Therefore, research is needed to develop a gas storage tunnel with relatively low geological requirements and a relatively manageable cost. Utility Model Content

[0003] In order to overcome the above-mentioned deficiencies of the existing underground gas storage, the technical problem to be solved by the present invention is to provide a low-cost gas storage tunnel based on the transformation of abandoned chambers of hydropower stations.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The gas storage tunnel, which is based on the transformation of an abandoned chamber in a hydropower station, includes a backfill concrete layer, a reinforced concrete lining and a flexible concrete sealing layer, which are sequentially cast on the surrounding rock of the chamber wall. The inner wall cross-section of the backfill concrete layer is circular, and a plurality of drainage flower pipes are arranged on its inner wall at intervals along its circumferential direction. The length direction of the drainage flower pipes is consistent with the length direction of the chamber and passes through both ends of the entire chamber. There are multiple through holes on the pipe wall of the drainage flower pipes.

[0006] Furthermore, the drainage flower pipes are stainless steel pipes or PVC pipes, and all the drainage flower pipes are inclined toward one end of the chamber.

[0007] Furthermore, 6-10 drainage flower pipes are evenly distributed along the circumferential direction of the surrounding rock of the cave wall.

[0008] Furthermore, a plurality of drainage ring pipes are arranged at intervals along the length direction of the drainage flower pipes, and the drainage ring pipes connect all the drainage flower pipes together along the circumferential direction of the surrounding rock of the cave wall, and a plurality of through holes are also uniformly distributed on the drainage ring pipes.

[0009] Furthermore, the thickness of the flexible concrete sealing layer is not less than 5 cm.

[0010] The beneficial effects of the present invention are as follows: the abandoned chamber of the hydropower station is used as a gas storage tunnel. The chamber itself has a certain structural strength, which can save the cost of chamber excavation. A drainage pipe is arranged on the contact surface of the reinforced concrete lining and the backfill concrete layer. During operation, the air tightness of the gas storage tunnel can be fed back through the exhaust conditions in the drainage pipe. At the same time, external pressure water can be collected and discharged through the drainage pipe to avoid damage to the lining of the gas storage tunnel; in addition, a flexible concrete sealing layer is provided on the inner wall of the reinforced concrete lining, which can not only adapt to the deformation of the inner wall of the chamber caused by the internal air pressure, but also play a sealing role, so that the abandoned chamber of the hydropower station can be used as an underground gas storage reservoir of a compressed air energy storage power station, which not only reduces the investment in the gas storage reservoir, but also can utilize the delivery project of the existing power station to reduce the overall cost of the compressed air energy storage power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the cross-sectional structure of the chamber of the utility model;

[0012] Figure 2 It is a structural schematic diagram of the utility model drainage flower pipe.

[0013] Marked in the figure are: 1-hole wall surrounding rock, 2-reinforced concrete lining, 3-flexible concrete sealing layer, 4-backfill concrete layer, 5-drainage flower pipe, 6-through hole, 7-drainage ring pipe. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] It should be noted that if directional terms are used in this utility model, such as "up," "down," "left," "right," "front," and "back," these are intended to facilitate the description of the relative positions of components and are not intended to specify the absolute positions of the related components or the positional relationships between them. They are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. If terms related to quantity are used in this utility model, such as "multiple," "a plurality," or "several," these specifically refer to two or more.

[0016] like Figure 1 、 Figure 2As shown, the utility model provides a gas storage tunnel based on the transformation of abandoned chambers of hydropower stations. It includes a backfill concrete layer 4, a reinforced concrete lining 2, and a flexible concrete sealing layer 3, which are sequentially cast on the surrounding rock 1 of the chamber wall. The inner wall cross-section of the backfill concrete layer 4 is circular, and multiple drainage flower pipes 5 are arranged on its inner wall along its circumferential direction. The length direction of the drainage flower pipes 5 is consistent with the length direction of the chamber and passes through the entire chamber at both ends. The pipe wall of the drainage flower pipes 5 is uniformly distributed with multiple through holes 6. Abandoned chambers of hydropower stations mainly include drainage tunnels or construction holes installed in the early stages of hydropower station construction, which are abandoned after the completion of the hydropower station construction. Because these chambers are often located deep in the mountain, their structural strength meets the requirements of gas storage chambers. They only need to be sealed to serve as gas storage tunnels. Moreover, the gas storage tunnels are close to the hydropower station and can be used in conjunction with the hydropower station to build a compressed air energy storage power station, facilitating power transmission and reducing the overall cost of the compressed air energy storage power station.

[0017] The drainage pipe 5 can be made of stainless steel or PVC. During operation, pressurized water outside the reinforced concrete lining 2 can enter the drainage pipe 5 through the through-hole 6 for drainage, thus preventing the external pressurized water from exerting pressure on the reinforced concrete lining 2 and causing damage. Furthermore, the drainage pipe 5 can also be used to verify the sealing performance. If cracks appear in the lining inside the chamber, high-pressure gas will enter the drainage pipe 5 through the cracks and through-hole 6. Therefore, the sealing performance of the lining can be determined by testing the exhaust gas at the end of the drainage pipe 5. To facilitate the drainage of pressurized water and the airtightness test, all drainage pipes 5 can be configured to be inclined toward one end of the chamber.

[0018] The flexible concrete sealing layer 3 is a layer of flexible concrete cast on the inner wall of the reinforced concrete lining 2. Unlike conventional concrete, flexible concrete is a composite material primarily composed of inorganic gravel and polymer. Its performance can be tailored to meet specific requirements, including mechanical properties, sealing properties, and economic efficiency. The polymer can be a polyurea material. The flexible concrete sealing layer 3 itself exhibits a certain degree of elasticity and provides a good sealing effect. It not only provides a good seal but also adapts to deformation of the inner wall 4 of the chamber caused by internal air pressure, ensuring a secure seal. Based on testing and considering its structural strength and degree of deformation, the thickness of the flexible concrete sealing layer 3 is preferably no less than 5 cm.

[0019] When renovating a cavern, for an abandoned cavern that has already been built, construction can be carried out directly on the inner wall of the cavern, or the original lining structure can be removed first, and then a backfill concrete layer 4 can be arranged to transform the cavern into a tunnel structure with a circular inner wall to ensure uniform force in all directions. After that, a drainage flower pipe 5 can be laid, and reinforced concrete lining 2 and a flexible concrete sealing layer 3 can be poured in sequence. For a newly built hydropower station, structures such as drainage flower pipes 5 and reinforced concrete lining 2 can be set up in the early stage of construction of the drainage tunnel or construction hole to meet drainage requirements. After the construction of the power station is completed, a layer of flexible concrete sealing layer 3 can be poured, and it can be used as a gas storage tunnel.

[0020] For drainage flower pipe 5, such as Figure 2 As shown, in order to fully collect external pressure water, 6-10 drainage flower pipes 5 can be evenly distributed along the circumferential direction of the cave wall surrounding rock 1. In addition, multiple drainage ring pipes 7 can be spaced apart along the length of the drainage flower pipes 5. The drainage ring pipes 7 connect all the drainage flower pipes 5 along the circumferential direction of the cave wall surrounding rock 1. The drainage ring pipes 7 are also evenly distributed with multiple through holes 6.

Claims

1. The gas storage tunnel, which is renovated from an abandoned chamber of a hydropower station, is characterized by: The invention comprises a backfill concrete layer (4), a reinforced concrete lining (2) and a flexible concrete sealing layer (3) which are sequentially cast on the surrounding rock of the cave wall (1); the inner wall cross section of the backfill concrete layer (4) is circular, and a plurality of drainage flower pipes (5) are arranged on the inner wall along its circumferential direction at intervals; the length direction of the drainage flower pipes (5) is consistent with the length direction of the cave chamber and passes through both ends of the entire cave chamber; a plurality of through holes (6) are evenly distributed on the pipe wall of the drainage flower pipes (5).

2. The gas storage tunnel based on the transformation of the abandoned chamber of the hydropower station according to claim 1 is characterized in that: The drainage flower pipes (5) are stainless steel pipes or PVC pipes, and all the drainage flower pipes (5) are inclined toward one end of the chamber.

3. The gas storage tunnel based on the transformation of the abandoned chamber of the hydropower station according to claim 2 is characterized in that: 6-10 drainage flower pipes (5) are evenly distributed along the circumferential direction of the surrounding rock of the cave wall (1).

4. The gas storage tunnel based on the transformation of the abandoned chamber of the hydropower station according to claim 3 is characterized in that: A plurality of drainage ring pipes (7) are arranged at intervals along the length direction of the drainage flower pipes (5). The drainage ring pipes (7) connect all the drainage flower pipes (5) together along the circumferential direction of the surrounding rock of the cave wall (1). The drainage ring pipes (7) are also uniformly distributed with a plurality of through holes (6).

5. The gas storage tunnel based on the transformation of the abandoned chamber of the hydropower station according to claim 1 is characterized in that: The thickness of the flexible concrete sealing layer (3) is not less than 5 cm.

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