An arrangement structure for a compressed air artificial cavern

Abstract

This application relates to an arrangement structure of a compressed air artificial cavern, comprising a cavern with a circular cross-section and extending along a first direction. The cavern has a concrete lining layer and a steel lining layer, with the steel lining layer located on the inner wall of the concrete lining layer. The first direction is approximately parallel to the horizontal plane. The cavern includes a first cavern, a second cavern, and a third cavern, arranged alternately in pairs. In the direction of gravity, the third cavern is located above the first and second caverns, and the axial distance between the third and first caverns is equal to the axial distance between the third and second caverns. This arrangement structure of the compressed air artificial cavern can reduce the geological application area, avoid unfavorable structures such as regional faults to a certain extent, and efficiently utilize high-quality surrounding rock.

Description

Technical Field

[0001] This application relates to the field of compressed air energy storage technology, and in particular to an arrangement structure of a compressed air artificial cavern. Background Technology

[0002] Compressed air energy storage (CASS) offers flexible controllability and is considered a promising energy storage technology given the rapid growth in demand for power storage. Underground storage facilities are a crucial component of CASS power plants and a key technology for ensuring their operational performance and reliability, thus determining the site selection. Common underground storage locations include salt caverns, aquifers, depleted oil and gas fields, abandoned mine shafts, and artificial caverns. The first four rely on specific geological structures and mineral resources, limiting site selection. Artificial caverns, less restricted by geological structures, have a wider range of applications, and are more compatible with my country's new energy resource areas, making them the currently promoted CASS underground storage solution.

[0003] Tunnel-type artificial caverns have small cross-sections, allowing for diverse cavern group combinations within limited space. They also offer strong structural load-bearing capacity and good maintenance conditions, making them a popular choice for existing compressed air storage facilities. However, tunnels are long, and tunnel-type artificial caverns are typically arranged on the same vertical plane. When used in large storage facilities, the laying area is wide, requiring high-quality regional geological conditions. Utility Model Content

[0004] This application provides an arrangement structure for a compressed air artificial cavern, which can reduce the geological deployment area and efficiently utilize high-quality surrounding rock.

[0005] The compressed air artificial cavern arrangement structure provided in this application embodiment includes a cavern with a circular cross-section and its length extending along a first direction. The cavern has a concrete lining layer and a steel lining layer, with the steel lining layer located on the inner wall of the concrete lining layer. The first direction is approximately parallel to the direction of the horizontal plane. The cavern includes a first cavern, a second cavern, and a third cavern, which are arranged in pairs at intervals. In the direction of gravity, the third cavern is located above the first and second caverns, and the axial distance between the third cavern and the first cavern is equal to the axial distance between the third cavern and the second cavern.

[0006] In addition, the arrangement structure of the compressed air artificial cavern provided in this application embodiment may also have the following additional technical features:

[0007] In one alternative arrangement, the structure further includes an inclined shaft located at one end of the cavern along its length, the inclined shaft having a maintenance access opening, and the inclined shaft communicating with the first cavern, the second cavern, and the third cavern.

[0008] In one alternative arrangement, the structure further includes a shaft and a gas pipeline, the shaft being located at the other end of the cavern along its length, and the gas pipeline connecting the first cavern, the second cavern, the third cavern, and the shaft.

[0009] In one alternative, the cavern is backfilled with a sealing body at one end near the shaft, the sealing body having a predetermined thickness in the first direction.

[0010] In one alternative scheme, the diameters of the first chamber, the second chamber, and the third chamber are equal. The diameter of the first chamber is defined as R, and the center distance between the third chamber and the first chamber is defined as L. Then, 5 ≤ L / R ≤ 6.

[0011] In one alternative embodiment, the diameter of the first cavern is 8-10m, the thickness of the concrete lining layer is 60-80cm, and the thickness of the cavern steel lining layer is 16-30mm.

[0012] The beneficial effects of the embodiments of this application are as follows:

[0013] In this embodiment, the cross-section of the cavern is circular. The stress state of the circular cavern is more uniform, and there is no stress concentration at sharp corners. In addition, the first, second, and third caverns are arranged in a triangular pattern, which reduces the geological coverage area and the scope of preliminary exploration. Furthermore, this arrangement can avoid unfavorable structures such as regional faults to a certain extent and make efficient use of high-quality surrounding rock.

[0014] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0015] Figure 1 A cross-sectional layout diagram of the cavern arrangement structure provided in this application;

[0016] Figure 2 This is a top view of the cavern layout structure provided in this application.

[0017] Attached reference numerals: 1. Concrete lining layer; 2. Steel lining layer of the tunnel; 3. First tunnel; 4. Second tunnel; 5. Third tunnel; 6. Inclined shaft; 7. Maintenance access opening; 8. Vertical shaft; 9. Gas pipeline; 10. Sealing body.

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0019] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0020] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0021] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0023] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0024] like Figure 1-2 As shown in the figure, this application embodiment provides an arrangement structure for a compressed air artificial cavern. The arrangement structure of the compressed air artificial cavern includes a cavern with a circular cross-section and the length direction of the cavern extends along a first direction. The cavern has a concrete lining layer 1 and a cavern steel lining layer 2. The cavern steel lining layer 2 is located on the inner wall of the concrete lining layer 1. Generally, the thickness of the concrete lining layer 1 is 60-80cm, and the thickness of the cavern steel lining layer 2 is 16-30mm. The first direction is approximately parallel to the direction of the horizontal plane.

[0025] The cavern comprises a first cavern 3, a second cavern 4, and a third cavern 5, arranged in pairs at intervals. In the direction of gravity, the third cavern 5 is located above the first cavern 3 and the second cavern 4, and the axial distance between the third cavern 5 and the first cavern 3 is equal to the axial distance between the third cavern 5 and the second cavern 4. The diameters of the first cavern 3, the second cavern 4, and the third cavern 5 can be approximately equal, specifically 8-10 m. Alternatively, in some other embodiments, the axial distances between the first cavern 3, the second cavern 4, and the third cavern 5 can be equal in pairs, meaning the line connecting the axial distances of the three caverns forms an equilateral triangle.

[0026] In this embodiment, the cross-section of the cavern is circular. The stress state of the circular cavern is more uniform, and there is no stress concentration at sharp corners. In addition, the first cavern 3, the second cavern 4, and the third cavern 5 are arranged in a triangle. This arrangement maintains the advantages of a circular tunnel. The cavern itself has good stability. The isosceles triangular arrangement of the caverns can offset some of the gas pressure, improve the stress, and at the same time reduce the geological coverage area. The scope of the preliminary exploration can also be reduced accordingly. Furthermore, this arrangement can avoid unfavorable structures such as regional faults to a certain extent, and make efficient use of high-quality surrounding rock in terms of space.

[0027] like Figure 2 As shown, in one specific embodiment, the arrangement structure further includes an inclined shaft 6, located at one end of the cavern along its length. The inclined shaft 6 is provided with a maintenance access port 7, and is connected to at least one of the first cavern 3, the second cavern 4, and the third cavern 5. Additionally, the arrangement structure includes a vertical shaft 8 and a gas pipeline 9, located at the other end of the cavern along its length. The gas pipeline 9 connects the first cavern 3, the second cavern 4, the third cavern 5, and the vertical shaft 8.

[0028] like Figure 2 As shown, in one specific embodiment, the cavity is backfilled with a sealing body 10 at one end near the shaft 8, and the sealing body 10 has a preset thickness in the first direction. The diameters of the first cavity 3, the second cavity 4, and the third cavity 5 are equal. The diameter of the first cavity 3 is defined as R, and the axial distance between the third cavity 5 and the first cavity 3 is defined as L. Then 5≤L / R≤6.

[0029] The layout structure of the compressed air artificial cavern in this application embodiment can be designed and constructed according to the following steps: First, conduct a survey of the local power and new energy resources to determine the necessity of constructing a compressed air energy storage power station; then, conduct on-site reconnaissance and collection of data on regional geology, lithology, topography, hydrology, transportation, etc., to preliminarily determine the site selection for the underground storage and the surface plant; next, conduct a site survey for the underground storage to reveal information such as rock layer distribution, regional structure, geostress, and groundwater, and determine lithological mechanical parameters through indoor tests; based on the rock layer distribution, select the target rock layer for the compressed air storage and determine the storage burial depth (generally 100-200m).

[0030] Based on geological conditions and target surrounding rock mechanical parameters, design the cross-sectional diameter (generally 8-10m), lining thickness (60-80cm), steel lining thickness (16-30mm), and related support parameters of the cavern. Determine the total required length of the cavern based on the storage volume requirements and the designed cross-section, and determine the length of each of the three caverns by dividing the length equally among them. Design a reasonable cavern spacing (generally 5-6 times the cavern diameter), and plan the axis of an isosceles or equilateral triangle based on the cavern spacing. Arrange two caverns below the isosceles or equilateral triangle and one above it. The center of the cross-section of the three circular caverns is located at the endpoint of the equilateral triangle. One end of the cavern is a sloping shaft 6, mainly for construction transportation and subsequent manual maintenance; a maintenance access point is reserved at this location. At the other end, a vertical shaft 8 (with a diameter of 8-12m) is set up for ventilation during construction. After completion, it will be the air inlet and outlet, connecting to the gas pipeline 9 to the ground. The gas pipeline 9 has two T-junctions underground. The first one is in the upper cavern, and the second one is located in the center of the two lower caverns. During construction, the construction of the three caverns is carried out simultaneously. The construction sequence is as follows: excavation, support, steel lining welding, lining backfilling, pipeline installation, and sealing body 10 backfilling.

[0031] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A structure for arranging a compressed air artificial cavern, characterized in that, The system includes a cavern with a circular cross-section and its length extending along a first direction. The cavern has a concrete lining layer and a steel lining layer, with the steel lining layer located on the inner wall of the concrete lining layer. The first direction is approximately parallel to the direction of the horizontal plane. The cavern includes a first cavern, a second cavern, and a third cavern, which are arranged in pairs at intervals. In the direction of gravity, the third cavern is located above the first and second caverns, and the axial distance between the third cavern and the first cavern is equal to the axial distance between the third cavern and the second cavern.

2. The arrangement structure of the compressed air artificial cavern according to claim 1, characterized in that, It also includes an inclined shaft located at one end of the cavern along its length, the inclined shaft being provided with a maintenance access opening, and the inclined shaft being connected to at least one of the first cavern, the second cavern, and the third cavern.

3. The arrangement structure of the compressed air artificial cavern according to claim 1 or 2, characterized in that, It also includes a vertical shaft and a gas pipeline, the vertical shaft being located at the other end of the cavern along its length, and the gas pipeline connecting the first cavern, the second cavern, the third cavern, and the vertical shaft.

4. The arrangement structure of the compressed air artificial cavern according to claim 3, characterized in that, The cavern is backfilled with a sealing body at one end near the shaft, and the sealing body has a preset thickness in the first direction.

5. The arrangement structure of the compressed air artificial cavern according to claim 1, 2, or 4, characterized in that, The first chamber, the second chamber, and the third chamber have the same diameter. Let R be the diameter of the first chamber and L be the center distance between the third chamber and the first chamber. Then, 5 ≤ L / R ≤ 6.

6. The arrangement structure of the compressed air artificial cavern according to claim 5, characterized in that, The diameter of the first cavern is 8-10m, the thickness of the concrete lining layer is 60-80cm, and the thickness of the steel lining layer of the cavern is 16-30mm.

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