Underground gas storage chamber and construction method thereof

Abstract

The invention belongs to the technical field of compressed air energy storage facilities, and particularly discloses an underground gas storage chamber and a construction method thereof.The underground gas storage chamber comprises a surrounding rock structure and a gas storage structure, the surrounding rock structure is provided with a storage space, and the gas storage structure is located in the storage space; the structure comprises a primary support, a lining layer, a sealing layer, a sliding layer and a lining layer which are sequentially arranged from outside to inside, a pressure reduction layer is arranged in the lining layer, the lining layer is divided into a first lining layer and a second lining layer by the pressure reduction layer, and the pressure reduction layer is made of a deformable material. A traditional single-layer lining layer is replaced by the double-layer lining layer, the pressure reduction layer is arranged between the double-layer lining layer and the double-layer lining layer, and dynamic loads caused by fluctuation of internal pressure of the gas storage are relieved through telescopic deformation of the pressure reduction layer, so that the risk that the lining layers crack is reduced, the service life of the underground gas storage chamber is prolonged, the advantages of reducing pressure and improving heat transfer are achieved, and the service life of the underground gas storage chamber is prolonged. And requirements of design on geology are reduced, and popularization and application are facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressed air energy storage facilities, and in particular relates to an underground gas storage chamber and a construction method thereof. Background Art

[0002] The basic principle of compressed air energy storage is to use excess electricity to drive compressors when the grid load is low, compress the air and store it in underground gas storage or above-ground high-pressure containers; when the grid load is peak, the high-pressure air is released to drive turbines to generate electricity, thereby achieving the storage and release of electricity and improving the stability of the energy system.

[0003] Underground gas storage is one of the most common underground gas storage devices, with advantages such as good fire and explosion resistance, little impact on the surrounding environment, and large gas storage capacity. During use, the compressed air energy storage power station will continuously cycle gas storage and release, generating periodic loads and large changes in chamber temperature. However, currently underground gas storage chambers are mostly composed of surrounding rocks, concrete linings, and sealing layers. These structures are very prone to cracks under the effects of periodic loads and large changes in chamber temperature, which seriously affects the service life and safety of the gas storage chamber. Summary of the invention

[0004] In view of the above-mentioned problems, the object of the present invention is to provide an underground gas storage chamber and a construction method thereof, so as to reduce the risk of cracks in the lining layer and increase the service life of the underground gas storage chamber.

[0005] The technical solution of the present invention is: an underground gas storage chamber, including a surrounding rock structure and a gas storage structure, wherein the surrounding rock structure has a storage space. The gas storage structure is located in the storage space and includes an initial support, a lining layer, a sealing layer, a sliding layer and an inner lining layer arranged in sequence from the outside to the inside.

[0006] A decompression layer is arranged inside the lining layer, and the decompression layer divides the lining layer into a first lining layer and a second lining layer, the first lining layer is close to the initial support, and the second lining layer is close to the sealing layer, and the decompression layer is made of a deformable material. An air storage space is arranged inside the inner lining layer, and the air storage space is used for air storage.

[0007] Furthermore, the first layer of lining is formed by sequentially splicing a plurality of first lining blocks, and the second layer of lining is formed by sequentially splicing a plurality of second lining blocks.

[0008] Furthermore, the pressure relief layer includes an annular buffer layer and a radial buffer layer.

[0009] The annular buffer layer is arranged between the first lining layer and the second lining layer, with its outer side in contact with the first lining block and its inner side in contact with the second lining block.

[0010] The radial buffer layer includes a plurality of outer buffer blocks and a plurality of inner buffer blocks. The plurality of outer buffer blocks are all arranged on the outer side of the annular buffer layer, in contact with the first lining blocks and are located one-to-one at the connection between two adjacent first lining blocks; the plurality of inner buffer blocks are all arranged on the inner side of the annular buffer layer, in contact with the second lining blocks and are located one-to-one at the connection between two adjacent second lining blocks.

[0011] Furthermore, the first lining block is preset with a first embedding groove corresponding to the outer buffer block, and the second lining block is preset with a second embedding groove corresponding to the inner buffer block.

[0012] Furthermore, the materials of the annular buffer layer and the radial buffer layer are composite phase change materials made of paraffin, expanded graphite and graphene aerogel.

[0013] Furthermore, the pressure relief layer also includes: a plurality of outer sealing layers, which are arranged one by one on the side where the outer buffer block contacts the first lining block; and a plurality of inner sealing layers, which are arranged one by one on the side where the inner buffer block contacts the second lining block.

[0014] Furthermore, the outer sealing layer and the inner sealing layer are made of perfluoroether rubber.

[0015] Furthermore, the contact points between the first lining block and the annular buffer layer, the outer buffer block and the outer sealing layer are all glued; the contact points between the second lining block and the annular buffer layer, the inner buffer block and the inner sealing layer are all glued.

[0016] A construction method for an underground gas storage chamber, which comprises: Dig the chamber. After the chamber is excavated and formed, clean the surrounding rock walls inside the chamber and then set up initial support.

[0017] Set the lining layer. After the first layer of lining is installed, clean the inner surface of the first layer of lining, set the pressure relief layer, and then set the second layer of lining. After the second layer of lining is installed, clean the inner surface of the second layer of lining, and lay the sealing layer, sliding layer and inner lining layer in sequence.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention replaces the traditional single-layer lining with a double-layer lining, with a pressure relief layer in the middle. The expansion and contraction deformation of the pressure relief layer is used to alleviate the dynamic load caused by the pressure fluctuation inside the gas storage reservoir, thereby reducing the risk of cracks in the lining layer and increasing the service life of the underground gas storage chamber.

[0019] 2. The present invention provides a pressure relief layer between the first lining layer and the second lining layer to reduce the pressure and deformation caused by the large temperature change during the inflation and deflation process, thereby increasing the service life of the gas storage chamber.

[0020] 3. The outer sealing layer and the inner sealing layer provided on the surface of the pressure reducing layer of the present invention can effectively improve the overall sealing of the structure, avoid water seepage and air seepage, and further improve the service life of the gas storage chamber.

[0021] 4. The underground gas storage chamber of the present invention has the advantages of reducing pressure and improving heat transfer, which reduces the requirements of the design on geology and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the local structure of the lining layer of the present invention; Figure 3 It is a schematic diagram of the local structure of the pressure relief layer of the present invention.

[0023] Among them, 1- surrounding rock structure, 2- initial support, 3- lining layer, 31- first layer of lining, 310- first lining block, 32- second layer of lining, 320- second lining block, 4- pressure relief layer, 41- annular buffer layer, 42- radial buffer layer, 421- outer buffer block, 422- inner buffer block, 43- outer sealing layer, 44- inner sealing layer, 5- sealing layer, 6- sliding layer, 7- inner lining layer, 8- gas storage space. DETAILED DESCRIPTION

[0024] Combine the following Figures 1 to 3 , the specific implementation methods of the present invention are described in detail. In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0026] Example like Figure 1An underground gas storage chamber shown in the figure comprises a surrounding rock structure 1 and a gas storage structure. The surrounding rock structure 1 has a storage space, and the gas storage structure is located in the storage space, which comprises an initial support 2, a lining layer 3, a sealing layer 5, a sliding layer 6 and an inner lining layer 7 arranged in sequence from the outside to the inside.

[0027] like Figure 1 , Figure 2 As shown, a decompression layer 4 is provided inside the lining layer 3, and the decompression layer 4 divides the lining layer 3 into a first lining layer 31 and a second lining layer 32. The first lining layer 31 is close to the initial support 2, and the second lining layer 32 is close to the sealing layer 5. The decompression layer 4 is made of a deformable material. An air storage space 8 is provided inside the inner lining layer 7, and the air storage space 8 is used to store air.

[0028] The pressure relief layer 4 has the function of absorbing pressure and deformation, and has the characteristics of high heat transfer efficiency; therefore, when the underground gas storage chamber is inflated and deflated, the pressure and deformation caused by the dynamic load generated in the gas storage space 8 are transmitted to the pressure relief layer 4 through the second layer of lining, so that the pressure relief layer 4 is deformed to release the stress of the second layer of lining 32 and avoid the generation of cracks. At the same time, the high temperature generated in the gas storage space 8 is more efficiently transmitted to the surrounding rock structure 1 through the pressure relief layer 4, so that the temperature of the entire underground gas storage structure converges, reducing the pressure and deformation caused by temperature changes, thereby improving the service life of the underground gas storage chamber. The sealing layer 5 ensures that the gas in the gas storage space 8 will not overflow. The sliding layer 6 ensures that the gas pressure in the gas storage space 8 can be more smoothly transferred to the second layer of lining 32.

[0029] In this embodiment, the materials of the initial support 2 and the lining layer 3 are both made of concrete, the material of the sealing layer 5 is perfluoroether rubber, the material of the sliding layer 6 is asphalt, and the material of the inner lining layer 7 is steel plate.

[0030] Preferably, the first layer lining 31 is formed by sequentially splicing a plurality of first lining blocks 310 , and the second layer lining 32 is formed by sequentially splicing a plurality of second lining blocks 320 .

[0031] Preferably, Figure 2 , Figure 3 As shown, the pressure relief layer 4 includes an annular buffer layer 41 and a radial buffer layer 42. The annular buffer layer 41 and the radial buffer layer 42 have the function of absorbing pressure and deformation, and at the same time have the characteristic of high heat transfer efficiency.

[0032] The annular buffer layer 41 is arranged between the first lining layer 31 and the second lining layer 32, and its outer side contacts the first lining block 310, and its inner side contacts the second lining block 320. The radial buffer layer 42 includes a plurality of outer buffer blocks 421 and a plurality of inner buffer blocks 422. The plurality of outer buffer blocks 421 are all arranged on the outer side of the annular buffer layer 41, contact the first lining block 310, and are located one-to-one at the connection between two adjacent first lining blocks 310; the plurality of inner buffer blocks 422 are all arranged on the inner side of the annular buffer layer 41, contact the second lining block 320, and are located one-to-one at the connection between two adjacent second lining blocks 320.

[0033] Preferably, a first inlay groove corresponding to the outer buffer block 421 is preset on the first lining block 310 , and a second inlay groove corresponding to the inner buffer block 422 is preset on the second lining block 320 .

[0034] Preferably, the materials of the annular buffer layer 41 and the radial buffer layer 42 are composite phase change materials made of paraffin, expanded graphite and graphene aerogel. Among them, the graphene aerogel is obtained by chemical reduction or thermal reduction of graphene oxide dispersion. Expanded graphite is formed by intercalation treatment and high-temperature expansion of natural graphite sheets in sequence to form loose and porous expanded graphite.

[0035] The preparation method of the composite phase change material is as follows: paraffin is heated to a molten state, expanded graphite powder is added to the molten paraffin, stirred evenly, the paraffin is fully adsorbed into the porous structure of the expanded graphite, and cooled to room temperature to obtain a paraffin and expanded graphite composite. Then, the graphene aerogel is impregnated or the molten paraffin / expanded graphite mixture is infiltrated into the porous structure of the graphene aerogel by a vacuum-assisted impregnation method, cooled to room temperature, the paraffin is solidified, and the composite material is cut or pressed into a desired shape according to design requirements.

[0036] Preferably, Figure 2 As shown, the pressure relief layer 4 further includes a plurality of outer sealing layers 43 and a plurality of inner sealing layers 44. The plurality of outer sealing layers 43 are arranged one by one on the side where the outer buffer block 421 contacts the first lining block 310; the plurality of inner sealing layers 44 are arranged one by one on the side where the inner buffer block 422 contacts the second lining block 320. The outer sealing layers 43 and the inner sealing layers 44 are used to seal the cracks generated by the assembly of the first lining block 310 and the second lining block 320, thereby improving the sealing performance of the structure.

[0037] Preferably, the material of the outer sealing layer 43 and the inner sealing layer 44 is perfluoroether rubber.

[0038] Preferably, the contact points between the first lining block 310 and the annular buffer layer 41 , the outer buffer block 421 , and the outer sealing layer 43 are all glued; the contact points between the second lining block 320 and the annular buffer layer 41 , the inner buffer block 422 , and the inner sealing layer 44 are all glued.

[0039] A construction method for an underground gas storage chamber, which is to construct the underground gas storage chamber proposed in this embodiment, specifically comprises: S1. After the chamber is excavated and formed, use cleaning equipment to thoroughly remove the loose rocks, soil, debris, etc. on the surrounding rock wall of the surrounding rock structure 1; during the cleaning process, it should be carried out from top to bottom and from left to right, ensuring that the surface of the surrounding rock wall of the surrounding rock structure 1 is flat and clean, without any protrusions or depressions, and there is no dust, oil or other pollutants on the surface; after the cleaning is completed, use advanced shotcrete equipment to evenly spray concrete on the surrounding rock wall according to the design requirements of the spraying thickness, spraying angle and spraying sequence, and set up initial support 2.

[0040] S2. In the factory, the molds of the first lining block 310 and the second lining block 320 are accurately made according to the designed size and shape of the first lining block 310 and the second lining block 320; the molds should be manufactured using high-precision processing equipment and processes; the first lining block 310 and the second lining block 320 are poured in the molds, and an inserted vibrator is used to vibrate during the pouring process; after the pouring is completed, it is cured and the concrete strength is tested regularly; when the concrete reaches the expected strength, it is demoulded and a comprehensive quality inspection is carried out to ensure that the quality of the first lining block 310 and the second lining block 320 fully meets the design and construction requirements, and then the qualified linings are properly packaged and transported to the construction site for standby use.

[0041] S3. Use the first lining block 310 to assemble and build the first layer of lining 31. After the first layer of lining 31 is installed and the inner surface is cleaned, the adhesive is evenly applied to the inner surface of the first layer of lining 31. The adhesive should cover the entire inner surface. During the application process, it is necessary to ensure that the adhesive is evenly applied without missing or thick coating. After the adhesive reaches the appropriate bonding strength, the outer sealing layer 43 is laid at the preset position and compacted. Then the annular buffer layer 41 and the outer buffer block 421 are tightly laid on the inner surface of the first layer of lining along the circumference of the chamber. Before laying, the materials should be checked to ensure that the materials are not damaged or wrinkled. During the laying process, ensure that the buffer layer is completely in contact with the lining surface without hollows or wrinkles.

[0042] Then, apply adhesive to the surface of the annular buffer layer 41 and the inner buffer block 422, first install the inner sealing layer 44 on the surface of the inner buffer block 422, and then construct the second lining 32 through the second lining block 320. During installation, ensure that the second lining 32 and the pressure relief layer 4 fit tightly. It should be noted that the adhesive should be applied to cover the entire inner surface, and the adhesive should be applied evenly during the application process without missing or thick coating. After the adhesive reaches a suitable bonding strength, lay the outer sealing layer 43 at the preset position and compact it.

[0043] S4. After the second layer of lining 32 is installed and cleaned, the sealing layer 5 is laid first. When laying, the rubber coil needs to be laid in the direction and order required by the design, starting from one end of the chamber and gradually laying it to the other end. Hot melt connection is used at the connection parts. After laying, the entire sealing layer 5 is tested for air tightness; then the pre-made lining layer 7 is placed in the chamber, and a uniform gap should be reserved between the lining layer 7 and the sealing layer 5 to install the sliding layer 6; during the installation process, ensure that there are no impurities between the lining layer 7, the sliding layer 6 and the sealing layer 5, and they fit tightly.

[0044] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. An underground gas storage chamber, characterized in that: include: The surrounding rock structure (1) has storage space; The gas storage structure is located in the storage space and comprises, from the outside to the inside, an initial support (2), a lining layer (3), a sealing layer (5), a sliding layer (6) and an inner lining layer (7) which are arranged in sequence; A pressure relief layer (4) is provided inside the lining layer (3), the pressure relief layer (4) divides the lining layer (3) into a first lining layer (31) and a second lining layer (32), the first lining layer (31) is close to the initial support (2), the second lining layer (32) is close to the sealing layer (5), and the pressure relief layer (4) is made of a deformable material; An air storage space (8) is provided inside the inner lining layer (7), and the air storage space (8) is used for storing air.

2. An underground gas storage chamber according to claim 1, characterized in that: The first layer lining (31) is formed by sequentially splicing a plurality of first lining blocks (310), and the second layer lining (32) is formed by sequentially splicing a plurality of second lining blocks (320).

3. An underground gas storage chamber as claimed in claim 2, characterized in that: The pressure reducing layer (4) comprises: An annular buffer layer (41) is provided between the first lining layer (31) and the second lining layer (32), with its outer side in contact with the first lining block (310) and its inner side in contact with the second lining block (320); The radial buffer layer (42) comprises: a plurality of outer buffer blocks (421) which are all arranged on the outer side of the annular buffer layer (41), in contact with the first lining blocks (310) and located one-to-one at the connection between two adjacent first lining blocks (310); and a plurality of inner buffer blocks (422) which are all arranged on the inner side of the annular buffer layer (41), in contact with the second lining blocks (320) and located one-to-one at the connection between two adjacent second lining blocks (320).

4. An underground gas storage chamber as claimed in claim 3, characterized in that: The first lining block (310) is preset with a first inlay groove corresponding to the outer buffer block (421), and the second lining block (320) is preset with a second inlay groove corresponding to the inner buffer block (422).

5. An underground gas storage chamber as claimed in claim 3, characterized in that: The materials of the annular buffer layer (41) and the radial buffer layer (42) are composite phase change materials made of paraffin, expanded graphite and graphene aerogel.

6. An underground gas storage chamber according to claim 3, characterized in that: The pressure relief layer (4) further comprises: a plurality of outer sealing layers (43), which are arranged one by one on a side of the outer buffer block (421) contacting the first lining block (310); A plurality of inner sealing layers (44) are arranged one by one in correspondence on a side of the inner buffer block (422) contacting the second lining block (320).

7. An underground gas storage chamber according to claim 6, characterized in that: The outer sealing layer (43) and the inner sealing layer (44) are made of perfluoroether rubber.

8. An underground gas storage chamber according to claim 6, characterized in that: The contact points between the first lining block (310), the annular buffer layer (41), the outer buffer block (421), and the outer sealing layer (43) are all glued; The contact points between the second lining block (320), the annular buffer layer (41), the inner buffer block (422), and the inner sealing layer (44) are all glued.

9. A construction method for an underground gas storage chamber, characterized in that: The construction of the underground gas storage chamber according to any one of claims 1 to 8 specifically includes: Excavate the chamber. After the chamber is excavated and formed, clean the surrounding rock wall inside the chamber and then set up initial support (2); A lining layer (3) is provided. After the first lining layer (31) is installed, the inner surface of the first lining layer (31) is cleaned, a pressure relief layer (4) is provided, and then a second lining layer (32) is provided. After the second lining layer (32) is installed, the inner surface of the second lining layer (32) is cleaned, and a sealing layer (5), a sliding layer (6), and an inner lining layer (7) are laid in sequence.

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