Sealing structure of compressed air energy and gas storage

Abstract

The utility model discloses a sealing structure of a compressed air energy storage gas storage, which belongs to the technical field of underground gas storage and comprises a sealing layer, a layered nested sliding layer and a concrete lining layer which are sequentially arranged from a cavern to a surrounding rock, and the concrete lining layer is fixed on the inner surface of the surrounding rock. The layered nested sliding layer comprises a sliding layer, a buffer layer and a protective layer which are sequentially arranged from outside to inside, the outer side of the sliding layer is bonded with the inner side of the concrete lining layer, and the inner side of the protective layer is bonded with the outer side of the sealing layer. The sealing structure has cohesiveness, buffering performance and sliding effect, can avoid the crack damage of the flexible sealing layer caused by the cracking of the concrete lining, can effectively adapt to the change of geological conditions and the deformation caused by long-term operation, and improves the reliability and the service life of the sealing structure.

Description

Technical Field

[0001] This utility model relates to a sealing structure for compressed air energy storage and gas storage, belonging to the technical field of underground gas storage. Background Technology

[0002] Compressed air energy storage (CAES) technology is one of the most promising large-scale energy storage technologies. Its basic principle is to use an air compressor to compress air and store it in a high-pressure air storage device. When there is a demand for electricity, the compressed air is released and used to generate electricity through a turbine expander, which is then transmitted to the user end or the grid end.

[0003] When using artificially excavated hard rock chambers as compressed air storage devices, a sealing structure needs to be designed to prevent high-pressure gas leakage. The sealing structure of the gas storage facility mainly consists of a sealing layer, a lining layer, and surrounding rock. The sealing layer primarily serves a sealing function, the lining layer primarily serves to transmit force, and the surrounding rock primarily serves to bear the pressure of the compressed air. Because the gas storage facility is subjected to alternating loads with varying temperatures and high pressures during operation, the deformation of the sealing layer and the lining layer may become inconsistent. Therefore, a sliding layer can be installed between the sealing layer and the lining layer.

[0004] As a key component of the sealing structure, the sliding layer can coordinate the relative displacement of various parts through its own sliding function, preventing the sealing layer from cracking or falling off due to uneven deformation. At the same time, it can disperse the stress concentration generated locally during the deformation of traditional sealing structures, reducing the risk of sealing structure failure due to excessive stress. However, the sliding layer in the existing technology is difficult to balance adhesion, buffering performance and sliding effect under complex working conditions, and it cannot effectively prevent the sealing layer from sinking into cracks and causing sealing failure in extreme cases such as lining cracking. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a sealing structure for compressed air energy storage and gas storage, which takes into account adhesion, buffering performance and sliding effect, can avoid the destruction of the flexible sealing layer due to cracking of concrete lining, can effectively adapt to changes in geological conditions and deformation caused by long-term operation, and improve the reliability and service life of the sealing structure.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A compressed air energy storage gas storage sealing structure includes a sealing layer, a layered nested sliding layer, and a concrete lining layer arranged sequentially from the cavern towards the surrounding rock. The concrete lining layer is fixed to the inner surface of the surrounding rock. The layered nested sliding layer includes a sliding layer, a buffer layer, and a protective layer arranged sequentially from the outside to the inside. The outer side of the sliding layer is bonded to the inner side of the concrete lining layer, and the inner side of the protective layer is bonded to the outer side of the sealing layer.

[0008] The sliding layer is mainly composed of epoxy-modified polyurea material.

[0009] The buffer layer is mainly composed of high-damping rubber material.

[0010] The main component of the protective layer is butyl rubber sealant.

[0011] The sliding layer and the buffer layer, as well as the buffer layer and the protective layer, are bonded together by adhesive.

[0012] The sealing layer is made of steel-lined sealing material or butyl rubber.

[0013] The adhesive is polyurea.

[0014] The concrete lining layer is made of reinforced concrete.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a compressed air energy storage gas storage sealing structure, which includes a layered nested sliding layer comprising a sliding layer, a buffer layer, and a protective layer arranged sequentially from the outside to the inside. The outer side of the sliding layer is bonded to the inner side of the concrete lining layer, and the inner side of the protective layer is bonded to the outer side of the sealing layer. When the gas storage gas storage experiences frequent inflation and deflation leading to rapid pressure changes, the sliding layer reduces frictional resistance, ensuring unimpeded structural deformation, maintaining the integrity of the sealing structure, and preventing localized damage. When the gas storage gas storage temperature rises, the buffer layer adjusts the expansion differences between the concrete lining, steel lining, and other structural layers through its own deformation, allowing each layer to work collaboratively and preventing the sealing layer from cracking or detaching due to uncoordinated deformation, thus enhancing the stability and reliability of the sealing structure. The protective layer assists the sealing layer in effectively blocking the infiltration of compressed air, ensuring the airtightness of the gas storage gas storage, and also reduces wear on the sealing layer. In summary, the layered nested sliding layer structure of this utility model has a clear division of labor and coordinated function among the layers, which can greatly enhance the function of the sliding layer and at the same time avoid the damage to the sealing layer caused by cracking of the lining. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the sealing structure of a compressed air energy storage tank according to the present invention;

[0017] Figure 2for Figure 1 A schematic diagram of a layered nested sliding layer structure;

[0018] The reference numerals in the figure are as follows: 1-Sealing layer; 2-Layered nested sliding layer; 3-Concrete lining layer; 4-Surrounding rock; 21-Sliding layer; 22-Buffer layer; 23-Protective layer. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the protection scope of the present invention.

[0020] Example 1

[0021] like Figure 1 and Figure 2 As shown, this utility model discloses a sealing structure for a compressed air energy storage tank, comprising a sealing layer 1, a layered nested sliding layer 2, and a concrete lining layer 3 arranged sequentially from the cavern towards the surrounding rock. The concrete lining layer 3 is fixed to the inner surface of the surrounding rock 4. The layered nested sliding layer 2 includes a sliding layer 21, a buffer layer 22, and a protective layer 23 arranged sequentially from the outside to the inside. The outer side of the sliding layer 21 is bonded to the inner side of the concrete lining layer 3, and the inner side of the protective layer 23 is bonded to the outer side of the sealing layer 1.

[0022] The sliding layer 21 is a low-resistance sliding layer used for bonding with the concrete lining layer, and is a true sliding layer. The buffer layer 22 serves as an intermediate layer, buffering the impact of structural deformation and coordinating the deformation differences between different layers. The protective layer 23 is bonded to the sealing layer 1, assisting in the sealing of the sealing layer.

[0023] In this invention, each layer of the nested sliding layer 2 is made of a different material to avoid damage to the flexible sealing layer caused by cracking of the concrete lining, and to fully coordinate the deformation between the concrete lining and the sealing layer.

[0024] Example 2

[0025] like Figure 1As shown, this utility model discloses a sealing structure for a compressed air energy storage tank. Along the inside-outward direction, it includes a sealing layer 1, a layered nested sliding layer 2, and a concrete lining layer 3 arranged sequentially. The concrete lining layer 3 is fixed to the inner surface of the surrounding rock 4. The inside-outward direction refers to the direction from the center of the chamber towards the surrounding rock 4. The sealing layer 1 mainly serves a sealing function and does not bear pressure. In this embodiment, the sealing layer 1 can be made of steel lining or flexible sealing materials such as butyl rubber. The concrete lining layer 3 can be made of reinforced concrete. The layered nested sliding layer 2 mainly serves to prevent damage to the sealing layer due to cracking of the lining, reduce wear on the sealing layer, and assist in sealing. In this embodiment, the layered nested sliding layer 2 consists of at least three layers of materials, such as… Figure 2 As shown, the layers are an outer layer (sliding layer 21), a middle layer (buffer layer 22), and an inner layer (protective layer 23). The sliding layer 21 and the buffer layer 22, as well as the buffer layer 22 and the protective layer 23, are bonded together by an adhesive, preferably a polyurea adhesive.

[0026] Specifically, the sliding layer 21 is made of epoxy-modified polyurea material. The epoxy groups give the material good adhesion properties, ensuring a tight bond with the concrete lining. Polyurea has low surface energy, a relatively regular molecular structure, and weak intermolecular forces, resulting in a smooth surface that effectively reduces friction when in contact with other objects. Epoxy-modified polyurea material reduces frictional resistance, ensuring unimpeded structural deformation, maintaining the integrity of the sealing structure, and preventing localized damage.

[0027] The buffer layer 22 is made of high-damping rubber. During the operation of the gas storage facility, the sealing structure will undergo complex deformations. The high-damping rubber intermediate layer can act as a buffer, coordinating the deformation differences between the innermost and outermost layers. High-damping rubber has good elasticity and resilience, and can continuously play a buffering and coordinating role.

[0028] The protective layer 23 is made of butyl rubber sealant, which has extremely low air permeability and can bond tightly to the steel lining or flexible sealing materials. Butyl rubber sealant has high flexibility and elasticity, maintaining good sealing performance and preventing gas leakage during structural deformation. In the event of lining cracking, it prevents the sealing layer from sinking into the cracks, while coordinating deformation between layers to ensure effective connection and coordinated operation of the entire sliding layer with the external structure.

[0029] The specific design and manufacturing scheme of the layered nested sliding layer 2 in this utility model is as follows:

[0030] Step one: First, select suitable epoxy resin and polyurea resin as base raw materials, and determine their ratio according to design requirements. For example, a two-component system can be used, preparing the epoxy resin component and the polyurea component separately.

[0031] Step two: Add appropriate amounts of curing agents, accelerators and other additives to the epoxy resin component to ensure that it can fully react with polyurea and cure within a suitable time.

[0032] Step 3: Modify the polyurea component by adding low surface energy substances such as organosilicon to further reduce the surface friction coefficient of the material.

[0033] Step four involves pre-treating the concrete lining surface, including cleaning, grinding, and drying, to improve the surface roughness and cleanliness of the concrete and enhance its adhesion to the epoxy-modified polyurea material.

[0034] Step 5: Apply the epoxy-modified polyurea material evenly to the concrete lining surface using spraying or brushing. During construction, it is crucial to control the thickness and uniformity of the coating to avoid defects such as sagging and bubbles.

[0035] Step six: After construction is completed, cure the material under appropriate temperature and humidity conditions according to the material's curing requirements to ensure that the material is fully cured and achieves optimal adhesion and low resistance performance.

[0036] Step 7: Clean the surface of the low-resistance sliding layer.

[0037] Step 8: Select a suitable primer, such as polyurea adhesive. Apply the primer evenly to the cleaned, low-resistance sliding layer surface, with a coating thickness of approximately 0.05-0.1 mm.

[0038] Step nine: Tightly bond the high-damping rubber to the epoxy-modified polyurea material. Use a support frame to ensure complete adhesion between the two layers.

[0039] Step 10: Clean the surface of the buffer coordination layer.

[0040] Step 11: Apply polyurea adhesive to the surface of the buffer coordination layer, and then apply butyl rubber sealant to the buffer coordination layer. When applying, start from one end and slowly press the sealant towards the buffer coordination layer, while using a roller or scraper to roll or smooth it from the bonding area outwards to remove air between the two layers, ensuring a tight bond without bubbles or gaps.

[0041] Step 12: Perform quality inspection on the layered nested sliding layer.

[0042] The design and manufacturing scheme of this utility model is simple and easy to implement, with a short construction period. The resulting layered nested sliding layer structure can be applied to underground hard rock sealing structures for compressed gas energy storage, avoiding damage to the sealing layer caused by lining cracks, reducing sealing layer wear, and assisting the sealing layer in its sealing function. It has good application prospects.

[0043] The above are merely preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A compressed air energy storage reservoir seal structure, characterized by: The sealing layer (1), the layered nested sliding layer (2) and the concrete lining layer (3) are sequentially arranged from the chamber to the surrounding rock, the concrete lining layer (3) is fixed to the inner surface of the surrounding rock (4), the layered nested sliding layer (2) comprises a sliding layer (21), a buffer layer (22) and a protective layer (23) sequentially arranged from outside to inside, the outer side of the sliding layer (21) is bonded to the inner side of the concrete lining layer (3), and the inner side of the protective layer (23) is bonded to the outer side of the sealing layer (1).

2. The compressed air energy storage reservoir seal of claim 1, wherein: The main component of the sliding layer (21) is an epoxy modified polyurea material.

3. The compressed air energy storage storage reservoir seal of claim 1, wherein: The main component of the buffer layer (22) is a high-damping rubber material.

4. The compressed air energy storage storage reservoir seal of claim 1, wherein: The main component of the protective layer (23) is a butyl rubber sealant material.

5. The compressed air energy storage storage reservoir seal of claim 1, wherein: The sliding layer (21) and the buffer layer (22) and the buffer layer (22) and the protective layer (23) are bonded by an adhesive.

6. The compressed air energy storage storage reservoir seal of claim 1, wherein: The sealing layer (1) adopts a steel lining sealing material or butyl rubber.

7. The compressed air energy storage storage reservoir seal of claim 5, wherein: The adhesive is a polyurea glue.

8. The compressed air energy storage storage reservoir seal of claim 1, wherein: The concrete lining layer (3) adopts reinforced concrete.

Images