CAES artificial chamber gas storage and rubber sealing layer structure

Abstract

The invention discloses a CAES artificial chamber gas storage and rubber sealing layer structure, and belongs to the technical field of compressed air energy storage. The rubber sealing layer structure comprises a PTFE coating, a first butyl rubber layer, a transverse fiber cloth layer, a second butyl rubber layer, a longitudinal fiber cloth layer and a third butyl rubber layer which are sequentially arranged from outside to inside. The third butyl rubber layer is made of halogen modified butyl rubber. The CAES artificial chamber gas storage comprises a surrounding rock body, a pressure-bearing thin layer is arranged on the inner side of the surrounding rock body, a water-permeable concrete layer is arranged on the inner side of the pressure-bearing thin layer, a rubber sealing layer structure is arranged on the inner side of the water-permeable concrete layer, and a cylindrical chamber is arranged on the inner side of the rubber sealing layer structure. By optimizing the layered reinforcing structure of the overall pressure-bearing and anti-seepage system and the rubber sealing layer of the gas storage, the functions of improving the puncture resistance of the sealing layer and reducing the pressure relief stripping risk can be achieved.

Description

TECHNICAL FIELD

[0001] The application relates to a CAES artificial chamber gas storage and a rubber sealing layer structure, and belongs to the technical field of compressed air energy storage. BACKGROUND

[0002] With the increasing demand for clean energy worldwide, renewable energy such as wind and solar energy is increasingly occupying a larger proportion in the energy structure. However, the intermittency and instability of these renewable energy sources pose a great challenge to the stable operation of the power system. As a large-scale energy storage solution, compressed air energy storage (CAES) technology can effectively store excess electricity and release it when needed, providing support for peak shaving, frequency regulation and backup power supply of the power system, thereby improving the utilization efficiency of renewable energy and the stability of the power system.

[0003] As the core component of the compressed air energy storage system, the CAES artificial chamber gas storage has many advantages. It can utilize underground space, reducing the occupation of ground space, and the natural barrier effect of underground rock mass can improve the safety and stability of the gas storage. In addition, the site selection of the artificial chamber gas storage is relatively flexible and is not limited by natural geological conditions, and can be optimized according to energy demand and power grid layout. Currently, CAES artificial chamber gas storage has been applied in many countries and regions, such as the United States, Germany, China, etc., and with the continuous progress of technology and the reduction of cost, its application prospect is increasingly broad.

[0004] In the CAES artificial chamber gas storage, the rubber sealing layer plays a crucial role, which is directly related to the sealing and safety of the gas storage. However, the existing rubber sealing layer of the CAES artificial chamber gas storage has two major technical problems:

[0005] 1. High risk of perforation: Traditional flexible high polymer sealing layer mostly uses a single rubber structure layer, which has insufficient puncture resistance. When local stress concentration of the chamber surrounding rock produces microcracks, or there are foreign objects (such as gravel, metal debris) during construction, the rubber sealing layer is easily pierced, leading to high-pressure air leakage and reduced system efficiency;

[0006] 2. Severe peeling after pressure relief: The adhesion between the sealing layer and the chamber base layer (such as the concrete layer) depends on the adhesion of ordinary rubber itself. During the pressure relief process, the sealing layer produces "contraction-rebound" deformation due to the sudden change of internal and external pressure. If the interlayer adhesion is less than the deformation tension, peeling between the sealing layer and the base layer may occur. Under the action of cyclic high-pressure charging and discharging, the sealing layer of the gas storage is prone to tensile cracking damage, which may cause serious safety problems such as failure of the sealing layer of the gas storage and leakage of high-pressure gas, greatly reducing the economic benefit of the gas storage.

[0007] The prior art, such as CN202411083361.7 disclosed "a composite sealing material structure of underground gas storage and its construction method", although the fiber reinforced polyurethane composite material is used, but the arrangement of the fabric layer is not optimized, the anti-puncture performance is limited, and the problem of serious peeling of the sealing layer after pressure relief of the gas storage is not considered; CN202310596092.3 discloses "a detection method for double membrane structure circulating gas injection in underground rock cave gas storage cavity", which improves the interlayer bonding by setting double membrane structure in the gas storage cavity, but does not solve the problem of improving the anti-puncture performance of the sealing layer. At present, there is no integrated structure design to solve the problems of "rubber sealing layer perforation" and "peeling after pressure relief", which cannot meet the needs of long-term high-pressure cyclic operation of CAES artificial chamber gas storage. SUMMARY

[0008] The technical problem to be solved by the present application is to overcome the defects of the prior art and provide a CAES artificial chamber gas storage which can improve the anti-puncture performance of the sealing layer and reduce the risk of peeling after pressure relief by optimizing the layered reinforcing structure of the rubber sealing layer.

[0009] To solve the above technical problems, the technical scheme adopted by the present application is:

[0010] In a first aspect, the present application provides a rubber sealing layer structure, which comprises PTFE coating, first butyl rubber layer, transverse fiber cloth layer, second butyl rubber layer, longitudinal fiber cloth layer and third butyl rubber layer arranged from outside to inside, the PTFE coating and the transverse fiber cloth layer are bonded by the first butyl rubber layer, the transverse fiber cloth layer and the longitudinal fiber cloth layer are bonded by the second butyl rubber layer, the inner side of the longitudinal fiber cloth layer and the outer side of the third butyl rubber layer are bonded, and the third butyl rubber layer adopts halogen modified butyl rubber.

[0011] In a second aspect, the present application provides a CAES artificial chamber gas storage, which comprises a surrounding rock mass, a pressure-bearing thin layer is arranged on the inner side of the surrounding rock mass, a water permeable concrete layer is arranged on the inner side of the pressure-bearing thin layer, the rubber sealing layer structure is arranged on the inner side of the water permeable concrete layer, and a cylindrical chamber is arranged on the inner side of the rubber sealing layer structure.

[0012] The surrounding rock mass is a granite surrounding rock mass with integrity level II.

[0013] The material of the pressure-bearing thin layer is UHPC.

[0014] The inner diameter of the cylindrical chamber is 20m, and the length is 100m.

[0015] The water permeable concrete layer is provided with an air guide pipe, the air guide pipe is arranged in a ring shape, an air inlet is formed on the inner side of the air guide pipe along the length direction, a first air exhaust pipe is communicated with the outer side of the air guide pipe, the first air exhaust pipe penetrates through the water permeable concrete layer, the pressure bearing thin layer and the surrounding rock mass, and a first pressure gauge and a first air exhaust valve are sequentially arranged on the first air exhaust pipe along the outward direction.

[0016] A second air exhaust pipe is communicated with the side of the first air exhaust pipe, and a second pressure gauge and a second air exhaust valve are sequentially arranged on the second air exhaust pipe along the direction away from the first air exhaust pipe.

[0017] The second air exhaust valve is a one-way valve.

[0018] The beneficial effects of the application are as follows:

[0019] The interlaced reinforcing network of the transverse fiber cloth layer and the longitudinal fiber cloth layer is arranged in the rubber sealing layer structure, combined with the outer PTFE coating, the puncture resistance is increased by 200%-300% compared with the traditional single rubber sealing layer, the perforation caused by the expansion of the surrounding rock microcracks or construction foreign matters can be effectively resisted, the puncture resistance is significantly improved, in addition, the third butyl rubber layer in the inner layer adopts halogen modified butyl rubber, the bonding strength with the water permeable concrete layer is increased by 150%-200% compared with ordinary butyl rubber, the peeling rate can be controlled below 5%, and the peeling risk after pressure relief is greatly reduced.

[0020] Through the "temporary storage and export" system composed of the water permeable concrete layer and the air guide pipe, in cooperation with the first pressure gauge and the second pressure gauge, the leakage of the rubber sealing layer structure can be monitored in real time, if a small amount of leakage occurs, the temporarily stored gas can be discharged through the first air exhaust pipe, when the leakage amount is large, the leakage gas can be quickly discharged through the second air exhaust pipe, so that the damage to the lining structure caused by the expansion of the leakage is avoided, and the second air exhaust pipe as a shunt pipe can further ensure the safety and stability of the exhaust process, and the leakage monitoring and emergency treatment capacity is enhanced.

[0021] The pressure bearing thin layer and the surrounding rock mass cooperatively bear, the water permeable concrete layer buffers stress, and the rubber sealing layer structure prevents seepage, so that the "bearing, buffering and anti-seepage" integrated system is formed, is applicable to different high pressure cycle conditions of the CAES artificial cavern gas storage, the overall structure stability is high, and the service life can be prolonged to more than 15 years. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a whole structure diagram of the CAES artificial cavern gas storage.

[0023] Figure 2 It is a structure schematic view of the high temperature and high pressure cavity.

[0024] The reference numerals in the figure are as follows: 1-surrounding rock mass; 2-pressure-bearing thin layer; 3-permeable concrete layer; 4-air duct; 5-rubber sealing layer; 6-air inlet; 7-first exhaust pipe; 8-first exhaust valve; 9-first pressure gauge; 10-second pressure gauge; 11-second exhaust valve; 12-second exhaust pipe; 13-chamber; 14-PTFE coating; 15-first butyl rubber layer; 16-transverse fiber cloth layer; 17-longitudinal fiber cloth layer; 18-third butyl rubber layer; 19-second butyl rubber layer. Detailed Implementation

[0025] 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 scope of protection of the present invention.

[0026] Example 1

[0027] like Figure 2 As shown, the present invention discloses a rubber sealing layer structure, which is composed of multiple layers of composite sealing materials, including a PTFE coating 14, a first butyl rubber layer 15, a transverse fiber cloth layer 16, a second butyl rubber layer 19, a longitudinal fiber cloth layer 17, and a third butyl rubber layer 18 arranged sequentially from the outside to the inside. The PTFE coating 14 and the transverse fiber cloth layer 16 are bonded together by the first butyl rubber layer 15, the transverse fiber cloth layer 16 and the longitudinal fiber cloth layer 17 are bonded together by the second butyl rubber layer 19, and the inner side of the longitudinal fiber cloth layer 17 is bonded to the outer side of the third butyl rubber layer 18.

[0028] The PTFE coating 14 serves as the outer protective layer of the rubber sealing layer structure, effectively resisting the corrosion of chemicals in the external environment while reducing friction with other objects. This prevents damage to the sealing layer due to friction during installation and use, thereby extending the service life of the sealing layer.

[0029] The first butyl rubber layer 15 and the second butyl rubber layer 19 are the main materials for achieving gas sealing in the rubber sealing layer structure. They have characteristics such as high air tightness, chemical corrosion resistance and strong deformation ability. Their good elasticity can also adapt to changes in internal pressure of the gas storage tank to a certain extent and maintain the effectiveness of the seal.

[0030] The transversely arranged fiber cloth layer 16 and the longitudinally arranged fiber cloth layer 17 use the same fiber cloth. The fibers of the transversely arranged fiber cloth layer 16 are arranged in the circumferential direction, and the fibers of the longitudinally arranged fiber cloth layer 17 are arranged in the length direction. The laying methods of the transversely arranged fiber cloth layer 16 and the longitudinally arranged fiber cloth layer 17 are the same. The two work together to form a "warp and weft interlacing" reinforcing network, which is used to enhance the tensile mechanical properties of the butyl rubber sealing layer, so as to prevent the butyl rubber sealing layer from being punctured and damaged by high pressure gas under tension, and improve the puncture resistance of the sealing layer.

[0031] The third butyl rubber layer 18 adopts halogen-modified butyl rubber. By introducing halogen atoms into the molecular chain of butyl rubber, the chemical structure is changed, so that it has better flexibility and adhesion. After halogenation, the intermolecular force of butyl rubber changes, the flexibility improves, and when the pressure of the gas storage changes, the modified butyl rubber molecular chain can adjust the arrangement more flexibly, adapt to deformation, and maintain the sealing performance. At the same time, the introduced halogen atoms increase the polarity of butyl rubber, and can form stronger interaction with other structure layers, improve the interfacial adhesion, thereby effectively preventing the sealing layer from peeling off during pressure relief.

[0032] Example 2

[0033] As shown in Figure 1 The application discloses a CAES artificial chamber gas storage, which comprises a surrounding rock body 1, which is a natural bearing foundation of the artificial chamber. In the embodiment, a granite surrounding rock body with an integrity level of II is selected, a cylindrical chamber 13 with an inner diameter of 20 m and a length of 100 m is formed by excavation, and a stable foundation is provided for subsequent structure layer construction. A pressure-bearing thin layer 2 is arranged on the inner side of the surrounding rock body 1, and the pressure-bearing thin layer 2 is arranged on the surface of the surrounding rock body 1 and serves as a main bearing enhancement layer of the chamber 13. The pressure-bearing thin layer is made of UHPC (ultra-high performance concrete) and has super-high strength and durability, can effectively disperse and bear the pressure generated by the high-pressure gas in the gas storage, prevents the surrounding rock body 1 from being damaged due to excessive pressure, and simultaneously provides a flat and stable foundation for subsequent structure layers.

[0034] The UHPC has super-high strength and durability, can effectively disperse and bear the pressure generated by the high-pressure gas in the gas storage, prevents the surrounding rock body (1) from being damaged due to excessive pressure, and simultaneously provides a flat and stable foundation for subsequent structure layers

[0035] A water-permeable concrete layer 3 is arranged on the inner side of the pressure-bearing thin layer 2 and has good water-permeable and air-permeable properties. The main function of the water-permeable concrete layer 3 is to temporarily store the trace amount of gas leaked from the rubber sealing layer structure 5 and timely discharge the accumulated gas that may leak from the sealing layer, so as to avoid damage to other structure layers caused by the accumulated gas and maintain the performance stability of each structure layer.

[0036] The rubber sealing layer structure 5 in the embodiment 1 is arranged on the inner side of the water-permeable concrete layer 3, and the rubber sealing layer structure 5 is arranged on the inner side of the water-permeable concrete layer 3 and serves as the core anti-seepage layer of the chamber. The rubber sealing layer structure 5 is arranged in the cylindrical chamber 13. The third butyl rubber layer 18 serves as the bottom layer of the rubber sealing layer and is directly bonded with the water-permeable concrete layer 3, the flexibility of the third butyl rubber layer 18 ensures that the third butyl rubber layer 18 can better adapt to deformation and maintain the sealing performance when the pressure of the gas storage changes, and the adhesion enhances the connection strength between the third butyl rubber layer 18 and other structure layers, thereby effectively preventing the sealing layer from peeling off during pressure relief.

[0037] The gas guide pipe 4 is embedded in the water permeable concrete layer 3 and is arranged in a ring shape around the chamber 13, and the pipe wall is provided with air inlets 6 along the length direction, and the air inlets are equidistantly distributed to ensure uniform collection of gas. The leaked gas is collected into the gas guide pipe 4 through the air inlets 6, so that the leaked gas is effectively collected, and conditions are provided for subsequent treatment. During construction, the gas guide pipe 4 is laid at a designed interval in the construction area of the water permeable concrete layer 3, and the gas guide pipe 4 extends to the outside of the chamber 13 and is communicated with the first exhaust pipe 7, so as to ensure that the interface is sealed and has no leakage. The water permeable concrete layer 3 is poured while avoiding the gas guide pipe 4, so as to prevent the concrete from directly impacting and causing the pipe to be displaced or damaged, and after pouring is completed, the gas guide pipe is detected for smoothness through a gas pressure test, and it is confirmed that the function of the gas guide pipe is normal.

[0038] The first exhaust pipe 7 is communicated with the outside of the gas guide pipe 4, the first exhaust pipe 7 penetrates through the water permeable concrete layer 3, the pressure bearing thin layer 2 and the surrounding rock body 1, and the first pressure table 9 and the first exhaust valve 8 are arranged on the first exhaust pipe 7 along the outward direction in sequence, the first pressure table 9 is used for monitoring the pressure change in the water permeable concrete layer 3, and the first exhaust valve 8 is used for exhausting the gas in the first exhaust pipe 7.

[0039] The second exhaust pipe 12 is communicated with the side of the first exhaust pipe 7, the second exhaust pipe 12 is used as a shunt pipe of the first exhaust pipe 7, and the second pressure table 10 and the second exhaust valve 11 are arranged on the second exhaust pipe 12 along the direction away from the first exhaust pipe 7 in sequence. The second pressure table 10 is used for monitoring the pressure value in the first exhaust pipe 7, and the second exhaust valve 11 is a one-way valve, which is opened when the pressure in the first exhaust pipe 7 is over-limited.

[0040] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A rubber sealing layer structure, characterized in that: The material comprises, from the outside to the inside, a PTFE coating (14), a first butyl rubber layer (15), a transverse fiber cloth layer (16), a second butyl rubber layer (19), a longitudinal fiber cloth layer (17), and a third butyl rubber layer (18). The PTFE coating (14) and the transverse fiber cloth layer (16) are bonded together by the first butyl rubber layer (15). The transverse fiber cloth layer (16) and the longitudinal fiber cloth layer (17) are bonded together by the second butyl rubber layer (19). The inner side of the longitudinal fiber cloth layer (17) is bonded to the outer side of the third butyl rubber layer (18). The third butyl rubber layer (18) is made of halogen-modified butyl rubber.

2. A CAES artificial chamber gas storage facility, characterized in that: It includes a surrounding rock mass (1), a pressure-bearing thin layer (2) is provided inside the surrounding rock mass (1), a permeable concrete layer (3) is provided inside the pressure-bearing thin layer (2), a rubber sealing layer structure (5) as described in claim 1 is provided inside the permeable concrete layer (3), and a cylindrical chamber (13) is provided inside the rubber sealing layer structure (5).

3. The CAES artificial chamber gas storage facility according to claim 2, characterized in that: The surrounding rock mass (1) is a granite surrounding rock mass with an integrity level of II.

4. The CAES artificial chamber gas storage facility according to claim 2, characterized in that: The material of the pressure-bearing thin layer (2) is UHPC.

5. The CAES artificial chamber gas storage facility according to claim 2, characterized in that: The cylindrical chamber (13) has an inner diameter of 20m and a length of 100m.

6. The CAES artificial chamber gas storage facility according to claim 2, characterized in that: A gas duct (4) is provided inside the permeable concrete layer (3). The gas duct (4) is arranged in a circumferential direction. An air inlet (6) is opened on the inner side of the gas duct (4) along the length direction. A first exhaust pipe (7) is connected to the outer side of the gas duct (4). The first exhaust pipe (7) passes outward through the permeable concrete layer (3), the pressure-bearing thin layer (2) and the surrounding rock mass (1). A first pressure gauge (9) and a first exhaust valve (8) are arranged sequentially on the first exhaust pipe (7) in the outward direction.

7. The CAES artificial chamber gas storage facility according to claim 6, characterized in that: The first exhaust pipe (7) is connected to a second exhaust pipe (12) on its side. A second pressure gauge (10) and a second exhaust valve (11) are arranged sequentially on the second exhaust pipe (12) in a direction away from the first exhaust pipe (7).

8. The CAES artificial chamber gas storage facility according to claim 7, characterized in that: The second exhaust valve (11) is a one-way valve.

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