Underground gas storage chamber with drainage and compressed air energy storage system

Abstract

The application discloses a kind of underground gas storage with drainage and compressed air energy storage system, it is related to the underground gas storage technology field of compressed air energy storage.The underground gas storage with drainage includes gas storage chamber, plug and drainage system;Gas storage chamber includes inner lining and concrete layer;Plug includes first fixed end and second fixed end, first fixed end and second fixed end are made of porous material, and are used for fixed connection with the above concrete layer, the inner cavity of first fixed end and the inner cavity of second fixed end are used for fixed connection above-mentioned inner lining;Drainage system includes drainage cross pipe and drainage pump, both ends of drainage cross pipe are connected between first fixed end and second fixed end, and drainage pump is communicated with drainage cross pipe by pump pipe.The underground gas storage with drainage of the application solves the technical problem that the surrounding rock water of underground gas storage system in the prior art is easy to enter the gas storage cavity from the outside and corrode the underground gas storage chamber.

Description

Technical Field

[0001] This invention relates to the field of underground gas storage technology for compressed air energy storage, and more particularly to an underground gas storage tunnel with drainage and a compressed air energy storage system. Background Technology

[0002] Compressed air energy storage technology is a type of electrical energy storage technology. During off-peak hours, a compressor converts electrical energy into the internal energy of the air and stores it in a storage system as high-pressure air. During peak hours, the high-pressure air is released from the storage system and used by an expander to generate electricity, thus converting the internal energy of the air into electrical energy.

[0003] Compressed air energy storage systems store the aforementioned high-pressure air through a storage system. The storage pressure is typically around 10 MPa, falling within the medium-to-high pressure range. Existing air storage systems are divided into above-ground and underground systems. Underground systems are particularly suitable for areas with underground excavation conditions, such as underground rock formations.

[0004] In the process of realizing this invention, the inventors discovered at least the following problems in the prior art:

[0005] Because underground gas storage systems require pressurization, they are typically located at depths of at least 20 meters in rock layers. The rock layer surrounding the underground gas storage system is called the surrounding rock. In areas with abundant water resources and under special weather conditions, the surrounding rock has a high water content, and this water may also contain acidic corrosive substances. Compressed air energy storage underground gas storage systems not only need to withstand pressure but also frequent inflation and deflation to bear cyclic loads. Most underground gas storage chambers have steel sidewalls; therefore, excessive water content in the surrounding rock can cause corrosion to begin from the outer wall of the underground gas storage chamber. If not detected in time, this can lead to water seeping into the underground gas storage chamber, resulting in a shortened lifespan, limited storage pressure, and other problems, further hindering the improvement of the compressed air energy storage system's efficiency. Furthermore, the drainage conditions of the underground gas storage facility directly affect its service life.

[0006] Therefore, how to efficiently and promptly drain the surrounding rock water and other liquids outside the underground gas storage tunnel is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide an underground gas storage system that can efficiently and promptly drain groundwater from the back of a steel liner.

[0008] To achieve this objective, on one hand, a drainage underground gas storage chamber is provided, comprising: a gas storage chamber, a duct, and a drainage system; the gas storage chamber includes an inner lining layer and a concrete layer, the concrete layer being disposed outside the inner lining layer; the duct includes a first fixed end and a second fixed end, both of which are made of porous material and are used for fixed connection with the concrete layer, the inner cavities of the first fixed end and the second fixed end being used for fixed connection with the inner lining layer; the drainage system includes a drainage horizontal pipe and a drainage pump, the two ends of the drainage horizontal pipe being connected between the first fixed end and the second fixed end, and the drainage pump being connected to the drainage horizontal pipe through a pump pipe.

[0009] Furthermore, there are multiple drainage horizontal pipes arranged in a ring; it also includes a drainage ring pipe, which is connected to all of the drainage horizontal pipes, and the pump pipe is connected to the drainage ring pipe.

[0010] Furthermore, the gas storage chamber is generally arc-shaped, and the first fixed end and the second fixed end are respectively fixed at both ends of the gas storage chamber.

[0011] Furthermore, the aforementioned duct also includes an air inlet / outlet pipe, which includes a first branch, a second branch, and a third branch that are interconnected. The first branch is sealed to the inner lining at the first fixed end, and the second branch is sealed to the inner lining at the second fixed end. The first branch and the second branch are arranged symmetrically, and the third branch is arranged intersectingly between the first branch and the second branch.

[0012] Furthermore, it also includes a vertical shaft, the lower end of which is located at and connected to the aforementioned end cap, and the upper end of which leads to the ground; the aforementioned pump pipe and the aforementioned third branch are both located within the aforementioned vertical shaft.

[0013] Furthermore, a flow meter is installed on the aforementioned pump pipe.

[0014] Furthermore, the aforementioned mortise is lower than the aforementioned gas storage chamber arrangement.

[0015] Furthermore, the aforementioned inner lining is a circular steel pipe.

[0016] Furthermore, the interior of the aforementioned lining layer is coated with an anti-corrosion coating.

[0017] On the other hand, a compressed air energy storage system is provided, including any of the above-mentioned underground gas storage tunnels with drainage.

[0018] Beneficial effects:

[0019] This proposed underground gas storage chamber with drainage system includes a duct, a gas storage chamber, and a drainage system. The gas storage chamber comprises an inner lining and a concrete layer, with the concrete layer located outside the inner lining. The duct includes a first fixed end and a second fixed end, both made of porous material and used for fixed connection to the concrete layer. The inner cavities of both the first and second fixed ends are used for fixed connection to the inner lining. The drainage system includes a horizontal drainage pipe and a drainage pump. The two ends of the horizontal drainage pipe are connected between the first and second fixed ends of the duct, and the drainage pump is connected to the horizontal drainage pipe via a pump pipe.

[0020] The drainage system of this underground gas storage chamber includes horizontal drainage pipes and a drainage pump. The horizontal drainage pipes are connected within the concrete layer, and the drainage pump provides the power for drainage. By implementing the drainage system, water is discharged from the concrete layer outside the inner lining of the gas storage chamber, maintaining the moisture content of the concrete layer outside the inner lining within a low range. This releases water pressure on the back of the inner lining, thereby ensuring the sealing and elasticity of the inner lining. Therefore, this underground gas storage chamber with drainage system can efficiently and promptly drain surrounding rock water and other liquids from the outside of the underground gas storage chamber, thereby improving the pressure-bearing capacity and service life of the underground gas storage chamber.

[0021] The compressed air energy storage system in this solution utilizes the aforementioned underground gas storage chamber with drainage, which not only reduces daily maintenance work and ensures that the underground gas storage chamber always operates within its optimal pressure range, but also improves the system efficiency. Furthermore, based on the aforementioned underground gas storage chamber with drainage, the compressed air energy storage system in this solution can expand the capacity of the underground gas storage chamber, thereby increasing its energy storage capacity. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the underground gas storage tunnel with drainage according to the present invention;

[0023] Figure 2 This is a schematic diagram of the drainage system of the underground gas storage tunnel with drainage according to the present invention;

[0024] Figure 3 yes Figure 1 Schematic diagram of the cross section at point AA;

[0025] Figure 4 This is a schematic diagram of the cross-section of the gas storage chamber.

[0026] In the diagram: 100 - Gas storage chamber; 110 - Inner lining; 120 - Concrete layer; 130 - Left end of the gas storage chamber; 140 - Right end of the gas storage chamber; 200 - End cap; 210 - First fixed end; 220 - Second fixed end; 230 - Inlet / outlet gas pipe; 231 - First branch; 232 - Second branch; 233 - Third branch; 300 - Drainage system; 310 - Drainage horizontal pipe; 320 - Drainage pump; 330 - Pump pipe; 340 - Drainage ring pipe; 350 - Flow meter; 400 - Shaft; 500 - Surrounding rock. Detailed Implementation

[0027] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Example 1:

[0031] like Figures 1-4As shown, this embodiment provides an underground gas storage chamber with drainage, including a gas storage chamber 100, a duct 200, and a drainage system 300. The gas storage chamber 100 includes an inner lining layer 110 and a concrete layer 120, with the concrete layer 120 disposed outside the inner lining layer 110. The duct 200 includes a first fixed end 210 and a second fixed end 220, both made of porous material and used for fixed connection to the concrete layer. The inner cavities of the first and second fixed ends are used for fixed connection to the inner lining layer 110. The drainage system 300 includes a drainage horizontal pipe 310 and a drainage pump 320. The two ends of the drainage horizontal pipe 310 are connected between the first fixed end 210 and the second fixed end 220 of the end cap. The drainage horizontal pipe 310 is located between the other end of the first fixed end 210 and the other end of the second fixed end 220. The drainage horizontal pipe 310 is used to drain excess surrounding rock water from the concrete layer 120 of the gas storage chamber. The drainage pump 320 is connected to the drainage horizontal pipe 310 through a pump pipe 330. The drainage pump 320 is used to provide power for draining excess surrounding rock water from the concrete layer 120 of the gas storage chamber.

[0032] This embodiment of the underground gas storage chamber with drainage system removes water from the concrete layer outside the inner lining of the gas storage chamber, maintaining the moisture content of the concrete layer outside the inner lining within a low range. This releases water pressure on the back of the inner lining, thereby ensuring the sealing and elasticity of the inner lining. Therefore, this drainage-equipped underground gas storage chamber can efficiently and promptly drain surrounding rock water and other liquids from the outside of the underground gas storage chamber, thereby improving its pressure-bearing capacity and service life.

[0033] Preferably, both the first fixed end and the second fixed end are made of a microporous material, which is a porous material. Further, both the first fixed end and the second fixed end are made of concrete.

[0034] Preferably, the underground gas storage chamber with drainage in this embodiment is generally arc-shaped, and the first and second fixed ends of the end cap are respectively fixed at both ends of the arc-shaped underground gas storage chamber with drainage. Alternatively, there may be multiple sets of underground gas storage chambers with drainage, one set fixed at the first fixed end of the end cap and another set fixed at the second fixed end of the end cap, both of which are within the protection scope of this application.

[0035] Furthermore, the bottom of the underground gas storage chamber is positioned below the gas storage chamber. The bottom of the underground gas storage chamber with drainage is the lowest point. The bottom of the underground gas storage chamber is positioned below the gas storage chamber, which is conducive to drainage by gravity and further improves the drainage performance.

[0036] Furthermore, such as Figure 2 and Figure 3As shown, the drainage system has multiple horizontal drainage pipes 310, and the multiple horizontal drainage pipes 310 are arranged in a ring, including a drainage ring pipe 340. The drainage ring pipe 340 is connected to all the horizontal drainage pipes 310, and the pump pipe 330 is connected to the drainage ring pipe 340.

[0037] Furthermore, such as Figure 2 As shown, a flow meter 350 is installed on the pump pipe to monitor the drainage flow rate and thus monitor the water conditions of the surrounding rock.

[0038] Furthermore, such as Figure 3 As shown, the duct 200 also includes an inlet / outlet air pipe 230, which includes a first branch 231, a second branch 232, and a third branch 233 that are interconnected. The first branch 231 is sealed to the inner lining at the first fixed end 210, and the second branch 232 is sealed to the inner lining at the second fixed end 220. The first branch 231 and the second branch 232 are arranged symmetrically, and the third branch 233 is arranged intersectingly between the first branch 231 and the second branch 232.

[0039] Furthermore, such as Figure 3 As shown, it also includes a shaft 400, the lower end of which is at and connected to the end cap 200, and the upper end of which leads to the ground. The pump pipe 330 and the third branch 233 are both located inside the shaft 400.

[0040] Furthermore, such as Figure 4 As shown, the inner lining 110 of the underground gas storage chamber with drainage is a circular steel pipe. Furthermore, the interior of the inner lining 110 of the underground gas storage chamber with drainage is coated with an anti-corrosion coating for waterproofing and corrosion protection inside the inner lining.

[0041] Example 2:

[0042] This embodiment provides a compressed air energy storage system, including any of the drainage-equipped underground gas storage chambers described in Embodiment 1. By employing the aforementioned drainage-equipped underground gas storage chamber, daily maintenance is reduced, and the chamber is ensured to always operate within its optimal pressure range, thereby improving the system efficiency of compressed air energy storage. Furthermore, based on the aforementioned drainage-equipped underground gas storage chamber, the compressed air energy storage system of this solution can expand the capacity of the drainage-equipped underground gas storage chamber, thereby increasing its energy storage capacity.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An underground gas storage cavern with drainage, characterized in that, The utility model relates to a kind of underground gas storage with drainage, including: Gas storage chamber, blind head and drainage system; The gas storage chamber includes inner lining and concrete layer, the concrete layer is arranged outside the inner lining;The blind head includes first fixed end and second fixed end, the first fixed end and the second fixed end are made of porous material, and are used for fixed connection with the concrete layer, the inner cavity of the first fixed end and the inner cavity of the second fixed end are used for fixed connection the inner lining; The drainage system includes drainage cross pipe and drainage pump, both ends of the drainage cross pipe are connected between the first fixed end and the second fixed end, the drainage pump is communicated with the drainage cross pipe by pump pipe, and the drainage system drains water in the concrete layer outside the inner lining of gas storage chamber; The gas storage chamber is arc-shaped as a whole, and the first fixed end and the second fixed end are fixed at both ends of the gas storage chamber respectively; The blind head further includes inlet and outlet air pipeline, the inlet and outlet air pipeline includes first turnout, second turnout and third turnout which are communicated with each other, the first turnout is sealingly connected with the inner lining at the first fixed end, and the second turnout is sealingly connected with the inner lining at the second fixed end;The first turnout and the second turnout are symmetrically arranged, and the third turnout is crossly arranged between the first turnout and the second turnout; It further includes a vertical shaft, the lower end of the vertical shaft is at the blind head and communicated with the blind head, and the upper end of the vertical shaft leads to the ground;The pump pipe and the third turnout are both located in the vertical shaft.

2. The underground gas storage cavern with drainage according to claim 1, characterized in that, The drainage cross pipe has a plurality of, and the plurality of drainage cross pipes are arranged annularly;It further includes drainage ring pipe, the drainage ring pipe is communicated with all the drainage cross pipes, and the pump pipe is connected to the drainage ring pipe.

3. The drained underground gas storage cavern of claim 1, wherein, Flow meter is arranged on the pump pipe.

4. The drained underground gas storage cavern of claim 1, wherein, The blind head is arranged lower than the gas storage chamber.

5. The drained underground gas storage cavern of claim 1, wherein, The inner lining is circular steel pipe.

6. The drained underground gas storage cavern of claim 1, wherein, The inner lining is coated with anticorrosive coating inside.

7. A compressed air energy storage system characterized in that, It further includes underground gas storage with drainage of any one of claims 1-6.

Images