Shallow-buried high-pressure air compression energy storage cavern composite bionic structure

Abstract

The application discloses a kind of shallow high-pressure air compression energy storage cavern composite bionic structure, including steel sealing layer and concrete lining sequentially coaxially arranged from inside to outside;Concrete lining includes the N arc-shaped concrete segment uniformly arranged along the circumference;Between two adjacent arc-shaped concrete segments, expansion joint is arranged;The inner wall surface of each arc-shaped concrete segment and the steel sealing layer form M bionic link buckles, and the longitudinal section of each bionic link buckle is oval-shaped.The application in the air compression energy storage power station inflation energy storage process, the internal pressure of steel sealing layer is greater than ground stress, and steel sealing layer temperature rises and expands, and prefabricated expansion joint can eliminate the tensile deformation of concrete lining;In the power station gas generation process, the internal pressure of steel sealing layer is less than ground stress, since steel sealing layer is previously linked with concrete lining using bionic design, steel sealing layer and concrete lining will not be separated, and then prevent potential high-pressure external water infiltration from causing sealing steel layer deformation.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage, and in particular to a composite biomimetic structure for shallow-buried high-pressure compressed air energy storage caverns. Background Technology

[0002] Compressed air storage power stations utilize excess electrical energy during periods of low load in the power system. Air is compressed and stored in underground caverns, then released and heated to generate electricity via gas turbine generators to meet peak load demands. During energy storage and power generation, the composite structure of the compressed air storage tank undergoes extreme temperature and pressure cyclic loading, significantly impacting the lining structure and surrounding rock stability of the cavern. The extreme temperature environment refers to the significant temperature increase during energy storage, rising from 0°C to as high as 130°C, followed by a rapid drop to 0°C during power generation. The extreme pressure environment refers to the pressure within the sealed layer varying between 1 MPa and 10 MPa as the air is added for energy storage and released for power generation.

[0003] Importantly, to improve the economic efficiency of compressed air energy storage power stations, the burial depth of the high-pressure gas storage facility should be less than 150m. At this depth, during the filling and storage process, the gas pressure exceeds the ground stress, leading to large deformation of the cavern composite structure, and the stress state of the concrete lining and surrounding rock cannot meet the design specifications. Therefore, it is necessary to propose a structural design form that allows shallow-buried compressed air energy storage facilities to meet underground structural design specifications. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a shallow-buried high-pressure air-compressed energy storage cavern composite biomimetic structure. This shallow-buried high-pressure air-compressed energy storage cavern composite biomimetic structure can overcome the effects of periodic temperature and load changes and prevent the deformation of the steel sealing layer caused by the infiltration of high-pressure external water.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A composite biomimetic structure for shallow-buried high-pressure air-compressed energy storage cavern includes a steel sealing layer and a concrete lining arranged coaxially from the inside to the outside.

[0007] The concrete lining consists of N arc-shaped concrete segments evenly distributed along the circumference; where N≥2; an expansion joint is provided between each two adjacent arc-shaped concrete segments; each arc-shaped concrete segment has M bionic holes on its inner wall; the N arc-shaped concrete segments have a total of M×N bionic holes.

[0008] The steel sealing layer is annular, with a compressed air energy storage chamber at its center. The outer surface of the steel sealing layer is provided with M×N bionic steel protrusions. The M×N bionic steel protrusions correspond one-to-one with the M×N bionic holes on the concrete lining and interlock with each other to form M×N bionic connecting buckles. Among them, M≥2.

[0009] Each bionic link has an elliptical longitudinal section with a major axis and a minor axis; the line containing the minor axis of each bionic link passes through the center of the compressed air energy storage chamber.

[0010] Let the length of the minor axis of the ellipse be *a*, then the formula for calculating the value of *a* is:

[0011]

[0012] In the formula, D is the inner diameter of the concrete lining.

[0013] Let the length of the major axis of the ellipse be b, then a:b = 1:1.8.

[0014] The concrete lining between two adjacent bionic connectors in each arc-shaped concrete segment is called a bionic concrete synapse; the contact point between the bionic concrete synapse and the corresponding bionic steel synapse is called point A, the center point of the corresponding bionic steel synapse is called point O, and the angle between the line connecting OA and the major axis of the ellipse of the corresponding bionic steel synapse is θ, then θ = 25°.

[0015] The number N of curved concrete segments is calculated according to the following formula:

[0016]

[0017] In the formula, h is the burial depth of the cavern; P max t represents the maximum design energy storage pressure of the compressed air energy storage chamber; t represents the thickness of the steel sealing layer.

[0018] The number M of biomimetic connecting buckles on each curved concrete segment needs to be determined based on the optimal simulated connection force between the sealing layer and the concrete lining.

[0019] M = 4.

[0020] The present invention has the following beneficial effects:

[0021] 1. During the air-filling energy storage process, the compressive stress of the compressed air storage chamber on the steel sealing layer reaches 10 MPa, while the ground stress is 3.8 MPa. Obviously, the compressive stress of the steel sealing layer is greater than the ground stress, and the increase in temperature of the steel sealing layer will put the concrete lining in a tensile state. However, the setting of expansion joints can effectively prevent cracks in the concrete lining due to tension.

[0022] 2. During the gas release power generation process, the compressive stress of the compressed air energy storage chamber on the steel sealing layer drops to 1 MPa, while the ground stress is 3.8 MPa. Obviously, the compressive stress of the steel sealing layer is less than the ground stress, and the sudden drop in temperature of the steel sealing layer will cause large shrinkage deformation within the steel sealing layer, leading to its separation from the concrete lining. However, the biomimetic connecting buckle in this invention will fix the steel sealing layer, preventing it from separating from the concrete lining and thus preventing high-pressure external water from seeping in and causing deformation of the steel sealing layer. Attached Figure Description

[0023] Figure 1 The diagram shows a structural schematic of a shallow-buried high-pressure air-compressed energy storage cavern composite biomimetic structure according to the present invention.

[0024] Figure 2 Showing Figure 1 An enlarged structural diagram of the bionic link buckle in the Chinese frame area.

[0025] Figure 3 The diagram shows the working principle of the composite biomimetic structure of the present invention during temperature rise during filling.

[0026] Figure 4 The diagram shows the working principle of the composite biomimetic structure of the present invention during temperature drop.

[0027] Figure 5 The simulation diagram shows the relationship between the number M of biomimetic connecting buckles on each curved concrete segment and the optimal simulated connecting force.

[0028] Among them are: 10. Steel sealing layer; 11. Bionic steel synapse;

[0029] 20. Concrete lining; 21. Bionic concrete synapse; 30. Bionic connector; 40. Compressed air energy storage chamber. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0031] In the description of this invention, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of this invention.

[0032] like Figure 1As shown, a shallow-buried high-pressure air-compressed energy storage cavern composite biomimetic structure includes a steel sealing layer 10 and a concrete lining 20 arranged coaxially from the inside to the outside.

[0033] The concrete lining consists of N arc-shaped concrete segments evenly distributed along the circumference; where N≥2, and specifically needs to satisfy the following calculation formula:

[0034]

[0035] In the formula, h is the burial depth of the cavern, in meters; P max The maximum design energy storage pressure of the compressed air energy storage chamber is expressed in MPa; t is the thickness of the steel sealing layer, expressed in meters.

[0036] Expansion joints are provided between two adjacent curved concrete segments; each curved concrete segment has M bionic holes on its inner wall; the N curved concrete segments have a total of M×N bionic holes.

[0037] The steel sealing layer is annular, with a compressed air energy storage chamber 40 at its center. The outer surface of the steel sealing layer is provided with M×N bionic steel protrusions 11. The M×N bionic steel protrusions correspond one-to-one with the M×N bionic holes on the concrete lining and interlock with each other to form M×N bionic connecting buckles 30. Among them, M≥2.

[0038] Furthermore, the number M of biomimetic connecting buckles on each curved concrete segment needs to be determined based on the optimal simulated connection force between the sealing layer and the concrete lining. In this embodiment, M=4 is preferred, and the specific simulation data is as follows: Figure 5 As shown.

[0039] like Figure 2 As shown, each bionic link buckle is modeled after the exoskeleton link structure of an iron beetle, and its longitudinal section is elliptical, with an elliptical major axis and an elliptical minor axis; the line containing the elliptical minor axis of each bionic link buckle passes through the center of the cross-section of the compressed air energy storage cavity.

[0040] Let the length of the minor axis of the ellipse be *a*, and the length of the major axis be *b*. Then the ratio of *a* to *b* is 1:1.8, and the formula for calculating the value of *a* is:

[0041]

[0042] In the formula, D is the inner diameter of the concrete lining.

[0043] Furthermore, the concrete lining between two adjacent bionic links in each arc-shaped concrete segment is called a bionic concrete synapse 21; the contact point between the bionic concrete synapse and the corresponding bionic steel synapse is called point A, the center point of the corresponding bionic steel synapse is called point O, and the angle between the line connecting OA and the major axis of the ellipse of the corresponding bionic steel synapse is θ, then θ = 25°.

[0044] like Figure 3 As shown, during the air-filling energy storage process, the compressive stress of the compressed air storage chamber on the steel sealing layer reaches 10 MPa, while the ground stress is 3.8 MPa. Obviously, the compressive stress of the steel sealing layer is greater than the ground stress, and the increase in temperature of the steel sealing layer will put the concrete lining in a tensile state. However, the setting of expansion joints can effectively prevent cracks in the concrete lining due to tension.

[0045] like Figure 4 As shown, during the gas release power generation process, the compressive stress of the compressed air storage chamber on the steel sealing layer drops to 1 MPa, while the ground stress is 3.8 MPa. Clearly, the compressive stress of the steel sealing layer is less than the ground stress, and the sudden drop in temperature of the steel sealing layer will cause large shrinkage deformation within the steel sealing layer, leading to its separation from the concrete lining. However, the biomimetic connecting buckle in this invention provides a fixing effect on the steel sealing layer, preventing it from separating from the concrete lining and thus preventing potential high-pressure external water infiltration that could cause deformation of the sealing steel layer.

[0046] This invention can effectively adapt to the stringent requirements of the underground cavern structure on the periodic temperature and pressure change working characteristics of shallow buried high-voltage air-compressed energy storage power stations.

[0047] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A composite biomimetic structure for shallow-buried high-pressure air-compressed energy storage cavern, characterized in that: This includes a steel sealing layer and a concrete lining arranged coaxially from the inside out; The concrete lining consists of N arc-shaped concrete segments evenly distributed along the circumference; where N≥2; an expansion joint is provided between each two adjacent arc-shaped concrete segments; each arc-shaped concrete segment has M bionic holes on its inner wall; the N arc-shaped concrete segments have a total of M×N bionic holes. The steel sealing layer is annular, with a compressed air energy storage chamber at its center. The outer surface of the steel sealing layer is provided with M×N bionic steel protrusions. The M×N bionic steel protrusions correspond one-to-one with the M×N bionic holes on the concrete lining and interlock with each other to form M×N bionic connecting buckles. Among them, M≥2. Each bionic link has an elliptical longitudinal section with a major axis and a minor axis; the line containing the minor axis of each bionic link passes through the center of the compressed air energy storage chamber.

2. The shallow-buried high-pressure air-compressed energy storage cavern composite biomimetic structure according to claim 1, characterized in that: Let the length of the minor axis of the ellipse be *a*, then the formula for calculating the value of *a* is: In the formula, D is the inner diameter of the concrete lining.

3. The shallow-buried high-pressure air-compressed energy storage cavern composite biomimetic structure according to claim 2, characterized in that: Let the length of the major axis of the ellipse be b, then a:b = 1:1.

8.

4. The shallow-buried high-pressure air-compressed energy storage cavern composite biomimetic structure according to claim 1, characterized in that: The concrete lining between two adjacent bionic connectors in each arc-shaped concrete segment is called a bionic concrete synapse; the contact point between the bionic concrete synapse and the corresponding bionic steel synapse is called point A, the center point of the corresponding bionic steel synapse is called point O, and the angle between the line connecting OA and the major axis of the ellipse of the corresponding bionic steel synapse is θ, then θ = 25°.

5. The shallow-buried high-pressure air-compressed energy storage cavern composite biomimetic structure according to claim 1, characterized in that: The number M of biomimetic connecting buckles on each curved concrete segment needs to be determined based on the optimal simulated connection force between the sealing layer and the concrete lining.

6. The shallow-buried high-pressure air-compressed energy storage cavern composite biomimetic structure according to claim 5, characterized in that: M＝4。

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