Method for arranging artificial gas storage caverns of compressed air energy storage system

Abstract

This application relates to a design method for the layout of artificial gas storage caverns in a compressed gas energy storage system. It is applicable to the field of underground high-pressure compressed gas energy storage technology. The technical solution is as follows: the compressed gas energy storage system adopts a concentric ring arrangement or a parallel arrangement; the gas storage caverns are arranged in a rectangular ring shape, including two long side segments, two short side segments, and a turning segment; the diameter D of the cavern end face, the distance a between two adjacent caverns, and the radius b of the turning segment are determined; based on the storage volume requirement V of the compressed gas energy storage system and the diameter D of the cavern end face, the shortest length of the gas storage caverns in the compressed gas energy storage system is determined; based on the shortest length of the gas storage caverns, the distance a between the caverns, the radius b of the turning segment, and the site limitations, and with the goal of minimizing the number of gas storage caverns and the minimum difference between the long and short side segments, the short side length x and the long side length y of the innermost ring gas storage cavern in the compressed gas energy storage system, as well as the number n of gas storage caverns in the compressed gas energy storage system, are solved.

Description

Technical Field

[0001] This invention relates to a method for designing the layout of artificial gas storage caverns in a compressed air energy storage system. It is applicable to the field of underground high-pressure compressed air energy storage technology. Background Technology

[0002] Underground energy storage facilities offer advantages such as high safety, low cost, and no need for surface land, making them a promising sector for energy reserves. Especially with the current energy structure placing significant demands on large-scale energy storage, compressed air energy storage power station projects are being widely adopted, further escalating the need for underground energy storage.

[0003] Traditional underground oil and gas storage facilities can be depleted oil and gas reservoirs, aquifers, abandoned mine shafts and salt caverns, artificial caverns, etc. Except for artificial caverns, other types of storage facilities rely on specific geological conditions, and the site selection is relatively limited.

[0004] The biggest advantage of underground artificial caverns is that they are suitable for a wide variety of rock types and have a broad geological distribution, effectively overcoming the geological limitations of other types of reservoirs. They also offer greater flexibility in site selection and are better suited to my country's wind and solar energy bases. Furthermore, artificial caverns can be designed in a standardized manner from site selection to construction, allowing for significant human involvement.

[0005] The layout and design of underground artificial caverns is a crucial aspect of engineering projects. A reasonable layout and design can effectively save construction time, reduce investment, and improve safety. Currently, most underground artificial energy storage caverns are in the early planning stage. Due to a lack of experience and standards, standardized design methods for cavern layout have not yet been established. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method for designing the layout of artificial gas storage caverns in a compressed gas energy storage system, in order to save construction time, reduce investment and improve safety.

[0007] The technical solution adopted in this invention is: a method for designing the layout of artificial gas storage caverns in a compressed gas energy storage system, characterized in that: the compressed gas energy storage system adopts a ring-shaped layout or a parallel layout;

[0008] The compressed air energy storage system with a ring arrangement has n gas storage chambers, n≥1, each gas storage chamber is arranged in a ring, and the n gas storage chambers are arranged concentrically and arranged in rings with equal spacing from the inside to the outside.

[0009] The parallel-arranged compressed air energy storage system has n gas storage chambers, each of which is arranged in a ring. The n gas storage chambers are arranged in parallel at equal intervals in the same plane.

[0010] The gas storage chamber is arranged in a rectangular ring shape, including two long side segments and two short side segments, as well as a turning segment connecting adjacent long side segments and short side segments;

[0011] Determine the diameter D of the end face of the gas storage chamber, the distance a between two adjacent gas storage chambers, and the radius b of the turning section;

[0012] Based on the required storage volume V of the compressed gas energy storage system and the diameter D of the end face of the gas storage chamber, determine the shortest length of the gas storage chamber in the compressed gas energy storage system.

[0013] Based on the minimum length of the gas storage cavern, the cavern spacing a, the turning radius b, and the site limitations, and with the objectives of minimizing the number of gas storage caverns and minimizing the difference between the lengths of the long and short sides, the short side length x and the long side length y of the innermost ring gas storage cavern in the compressed gas energy storage system, as well as the number n of gas storage caverns in the compressed gas energy storage system, are determined.

[0014] In a ring-shaped compressed air energy storage system, the total length of n gas storage chambers is greater than or equal to the shortest length of the gas storage chambers.

[0015]

[0016] The site area is limited by area constraints. The maximum area S of the compressed air energy storage system is determined based on site conditions. The area of ​​the outermost ring of gas storage chambers in the concentric compressed air energy storage system is less than S.

[0017] (y+2a(n-1))(x+2a(n-1))<S.

[0018] In a parallel-arranged compressed air energy storage system, the total length of n gas storage chambers is greater than or equal to the shortest length of the gas storage chambers.

[0019]

[0020] The site area is limited by area constraints. The maximum area S of the compressed air energy storage system is determined based on site conditions. The area of ​​the outermost ring of gas storage chambers in a parallel compressed air energy storage system is less than S.

[0021] [nx+a(n-1)]y<S.

[0022] The distance a between two adjacent gas storage chambers is greater than or equal to 5D.

[0023] The turning radius b of the turning segment is greater than or equal to 3D.

[0024] A compressed air energy storage system, characterized in that: the compressed air energy storage system adopts a ring-type arrangement or a parallel arrangement;

[0025] The compressed air energy storage system with a ring arrangement has n gas storage chambers, n≥1, each gas storage chamber is arranged in a ring, and the n gas storage chambers are arranged concentrically and arranged in rings with equal spacing from the inside to the outside.

[0026] The parallel-arranged compressed air energy storage system has n gas storage chambers, each of which is arranged in a ring. The n gas storage chambers are arranged in parallel at equal intervals in the same plane.

[0027] The gas storage chamber is arranged in a rectangular ring shape, including two long side segments and two short side segments, as well as a turning segment connecting adjacent long side segments and short side segments;

[0028] The diameter of the end face of the gas storage chamber is D, the distance between two adjacent gas storage chambers is a, and the radius of the turning section is b.

[0029] Based on the required storage volume V of the compressed gas energy storage system and the diameter D of the end face of the gas storage chamber, determine the shortest length of the gas storage chamber in the compressed gas energy storage system.

[0030] Based on the minimum length of the gas storage cavern, the cavern spacing a, the turning radius b, and the site limitations, and with the objectives of minimizing the number of gas storage caverns and minimizing the difference between the lengths of the long and short sides, the short side length x and the long side length y of the innermost ring gas storage cavern in the compressed gas energy storage system, as well as the number n of gas storage caverns in the compressed gas energy storage system, are determined.

[0031] The beneficial effects of the present invention are: by arranging n annular gas storage caverns concentrically and sequentially from the inside out or in parallel, and ensuring that the distance between adjacent gas storage caverns meets the preset conditions, the present invention improves the stress on the surrounding rock between adjacent gas storage caverns, ensures the stability of the surrounding rock, and improves safety.

[0032] This invention aims to minimize the number of gas storage chambers and the difference between the lengths of the long and short sides. It calculates the number of gas storage chambers (n) that meet the conditions, as well as the lengths of the short and long sides (x and y) of the innermost ring gas storage chamber. Fewer chambers mean fewer working faces; a smaller difference between the lengths of the long and short sides means a shorter excavation length for each working face, thereby saving construction time and reducing investment.

[0033] This invention establishes a method for determining cavern-related layout parameters, combining rock mass quality and regional constraints to constrain specific cavern cross-sections, spacing, and layout forms. This invention is applicable to concentric and parallel layout methods based on the expansion of annular caverns.

[0034] This invention concretizes the cavern layout design process into a mathematical optimization method. By solving a system of inequalities, it can quickly determine the cavern layout and precise layout parameters. This standardized design method helps improve design efficiency and facilitates widespread adoption. This invention emphasizes the constraints of on-site geological conditions, obtaining optimal cavern layout parameters through cavern volume requirements, site structure, and rock mass quality. Attached Figure Description

[0035] Figure 1 This is a schematic diagram illustrating the design principle of Example 1.

[0036] Figure 2 This is a schematic diagram illustrating the design principle of Example 2. Detailed Implementation

[0037] Example 1: This example is a design method for the layout of artificial gas storage caverns in a compressed gas energy storage system. The design method designs the compressed gas energy storage system in a ring-shaped layout with n gas storage caverns, n≥1. Each gas storage cavern is arranged in a ring, and the n gas storage caverns are arranged concentrically and ring by ring from the inside out.

[0038] In this embodiment, the gas storage chamber is arranged in a rectangular ring shape, including two long side segments and two short side segments, with adjacent long side segments and short side segments smoothly transitioning through a 90° turning section.

[0039] In this example, the diameter D of the cavern section is determined based on the surrounding rock conditions and construction conditions (generally 6-10m); the distance a between two adjacent gas storage caverns is determined based on the cavern stability calculation, and the axial distance between each cavern is generally ≥5D; the radius b of the turning section is determined based on construction requirements, and is generally ≥3D.

[0040] Based on the required storage volume V (100,000-500,000 cubic meters) of the compressed air energy storage system and the diameter D of the end face of the storage cavern, determine the shortest length of the required storage cavern in the compressed air energy storage system.

[0041] Based on the minimum length of the gas storage cavern, the cavern spacing a, the turning radius b, and the site limitations, and with the objectives of minimizing the number of gas storage caverns and minimizing the difference between the lengths of the long and short sides, the short side length x and the long side length y of the innermost ring gas storage cavern in the compressed gas energy storage system, as well as the number n of gas storage caverns in the compressed gas energy storage system, are determined.

[0042] This embodiment establishes a set of inequalities based on constraints such as site area and cavern length. The main constraints are as follows:

[0043] (1) Limitation on the length of the cavern.

[0044] In a compressed gas energy storage system, the length of the first ring of gas storage chambers (the innermost ring of gas storage chambers) from the inside out is the length of the two short straight segments 2(x-2b) + the length of the two long straight segments 2(y-2b) + the length of the four turning segments 2πb.

[0045] In this embodiment, the length of the first ring of gas storage chambers in the compressed gas energy storage system from the inside out is the length of the two short straight segments 2(x+2a-2b) + the length of the two long straight segments 2(y+2a-2b) + the length of the four turning segments 2πb.

[0046] In this example, the length of the nth ring of gas storage chambers in the compressed gas energy storage system from the inside out is the length of the two short straight segments 2(x+2(n-1)a-2b) + the length of the two long straight segments 2(y+2(n-1)a-2b) + the length of the four turning segments 2πb.

[0047] In this embodiment, the total length of the n gas storage chambers in the compressed gas energy storage system is not less than the shortest length of the required gas storage chambers in the compressed gas energy storage system, that is...

[0048]

[0049] (2) Site Scope Restrictions

[0050] In this example, the outermost ring cavern area should not exceed the area constrained by the site's geological conditions or ground constraints, or the boundary of the outermost ring cavern should not exceed the geological constraint boundary, depending on the specific project conditions. This example uses area constraints, determining the maximum area S of the compressed air storage system based on site conditions. The area of ​​the outermost ring gas storage cavern in the compressed air storage system is less than S.

[0051] (y+2a(n-1))(x+2a(n-1))<S

[0052] (3) Restrictions on the basic ring shape of the cavern

[0053] The length y of the longer side of the innermost ring chamber is greater than the length x of the shorter side, and the length x of the shorter side is greater than 0.

[0054] x≥0

[0055] y≥x

[0056] This results in a system of inequalities:

[0057]

[0058] In cavern layout design, inequalities can be added based on specific boundary conditions to obtain cavern layout parameters more accurately.

[0059] Substituting the values ​​of a and b, and taking the minimum number of gas storage chambers and the minimum difference between the lengths of the long and short sides as the objectives, we solve the above system of inequalities to obtain the number of chambers n, the length of the short side x, and the length of the long side y that satisfy the conditions. Based on the principle that the more chambers there are, the more working faces there are; the smaller the difference between the long and short sides, the shorter the excavation length of each working face, and thus the shorter the construction period, we obtain the optimal chamber layout and parameter dimensions for the construction period.

[0060] The following is a specific example: This embodiment aims to design an underground artificial gas storage facility with a volume of no less than 200,000 cubic meters. Due to terrain limitations, the site area does not exceed 200 acres, and the rock type at a burial depth of 150 meters is marble. The layout of the gas storage chambers is now determined, and the specific design method is as follows.

[0061] Due to the good integrity and lithology of the marble, the excavation cross-section of the cavern can be relatively large. Based on the principle of one-time blasting excavation, the cross-section diameter is determined to be 10m. The distance between the tunnels is generally greater than 5 times the diameter; here, considering the stability of the cavern, the distance between the two annular tunnels is 60m. The radius of the turning section is generally greater than 3 times the diameter of the gas storage cavern, and here it is determined to be 40m.

[0062] Based on the given conditions, the following inequality is obtained:

[0063]

[0064] When n=1, and there is only one cavern, the length of the short side of the cavern, according to the above inequality, is 80-82m, and the length of the long side is 1228-1226m; when n=2, and there are two annular caverns, there is no solution that meets the conditions of the inequality.

[0065] Therefore, under these conditions, the optimal solution among all possible cavern arrangements with only one cavern, based on the principle of minimizing the construction period, is a long side of 1226m and a short side of 82m.

[0066] Furthermore, in many cases, underground sites are unrestricted, and in such cases, the system of inequalities is:

[0067]

[0068] When n=1, with only one cavern, the short side of the cavern is 80-654m and the long side is 1208-654m according to the above inequality; when n=2, with two annular caverns, the short side is 80-275m and the long side is 471-276m according to the above inequality; when n=3, with three annular caverns, the short side is 80-109m and the long side is 139-110m according to the above inequality, with various combinations; when n=4, no long or short side values ​​that satisfy the inequality relationship can be obtained, which means that it is not necessary to have 4 caverns to meet the gas storage volume requirements.

[0069] Among the above conditions that satisfy the cavern layout requirements, the scheme with a large number of caverns and a small difference between the long and short sides is generally selected. This results in more construction faces and shorter excavation distances for each face, which helps to save construction time. Therefore, under the principle of optimizing the construction period, the optimal cavern design is: 3 caverns, with a basic ring long side of 110m and a short side of 109m.

[0070] Example 2: This example is a design method for the layout of artificial gas storage caverns in a compressed gas energy storage system. The design method designs the compressed gas energy storage system in a parallel layout with n gas storage caverns, n≥1. Each gas storage cavern is arranged in a ring, and the n gas storage caverns are arranged in parallel at equal intervals in the same plane.

[0071] In this embodiment, the gas storage chamber is arranged in a rectangular ring shape, including two long side segments and two short side segments, with adjacent long side segments and short side segments smoothly transitioning through a 90° turning section.

[0072] In this example, the diameter D of the cavern section is determined based on the surrounding rock conditions and construction conditions (generally 6-10m); the distance a between two adjacent gas storage caverns is determined based on the cavern stability calculation, and the axial distance between each cavern is generally ≥5D; the radius b of the turning section is determined based on construction requirements, and is generally ≥3D.

[0073] Based on the required storage volume V (100,000-500,000 cubic meters) of the compressed air energy storage system and the diameter D of the end face of the storage cavern, determine the shortest length of the required storage cavern in the compressed air energy storage system.

[0074] Based on the minimum length of the gas storage cavern, the cavern spacing a, the turning radius b, and the site limitations, and with the objectives of minimizing the number of gas storage caverns and minimizing the difference between the lengths of the long and short sides, the short side length x and the long side length y of the innermost ring gas storage cavern in the compressed gas energy storage system, as well as the number n of gas storage caverns in the compressed gas energy storage system, are determined.

[0075] This embodiment establishes a set of inequalities based on constraints such as site area and cavern length. The main constraints are as follows:

[0076] (1) Limitation on the length of the cavern.

[0077] In this embodiment, the total length of the n gas storage chambers in the compressed gas energy storage system is not less than the shortest length of the required gas storage chambers in the compressed gas energy storage system, that is...

[0078]

[0079] (2) Site Scope Restrictions

[0080] In this example, the outermost ring cavern area should not exceed the area constrained by the site's geological conditions or ground constraints, or the boundary of the outermost ring cavern should not exceed the geological constraint boundary, depending on the specific project conditions. This example uses area constraints, determining the maximum area S of the compressed air storage system based on site conditions. The area of ​​the outermost ring gas storage cavern in the compressed air storage system is less than S.

[0081] [nx+a(n-1)]y<S

[0082] (3) Restrictions on the basic ring shape of the cavern

[0083] The length y of the longer side of the innermost ring chamber is greater than the length x of the shorter side, and the length x of the shorter side is greater than 0.

[0084] x≥0

[0085] y≥x

[0086] This results in a system of inequalities:

[0087]

[0088] In cavern layout design, inequalities can be added based on specific boundary conditions to obtain cavern layout parameters more accurately.

[0089] Substituting the values ​​of a and b, and taking the minimum number of gas storage chambers and the minimum difference between the lengths of the long and short sides as the objectives, we solve the above system of inequalities to obtain the number of chambers n, the length of the short side x, and the length of the long side y that satisfy the conditions. Based on the principle that the more chambers there are, the more working faces there are; the smaller the difference between the long and short sides, the shorter the excavation length of each working face, and thus the shorter the construction period, we obtain the optimal chamber layout and parameter dimensions for the construction period.

[0090] Example 3: This example is a compressed gas energy storage system, which is designed using the artificial gas storage cavern layout design method in Example 1 or Example 2.

Claims

1. A method for designing the layout of artificial gas storage caverns in a compressed gas energy storage system, characterized in that: The compressed gas energy storage system is arranged in a ring-shaped or parallel configuration. The compressed air energy storage system with a ring arrangement has n gas storage chambers, n≥1, each gas storage chamber is arranged in a ring, and the n gas storage chambers are arranged concentrically and arranged in rings with equal spacing from the inside to the outside. The parallel-arranged compressed air energy storage system has n gas storage chambers, each of which is arranged in a ring. The n gas storage chambers are arranged in parallel at equal intervals in the same plane. The gas storage chamber is arranged in a rectangular ring shape, including two long side segments and two short side segments, as well as a turning segment connecting adjacent long side segments and short side segments; Determine the diameter D of the end face of the gas storage chamber, the distance a between two adjacent gas storage chambers, and the radius b of the turning section; Based on the required storage volume V of the compressed gas energy storage system and the diameter D of the end face of the gas storage chamber, determine the shortest length of the gas storage chamber in the compressed gas energy storage system. Based on the minimum length of the gas storage cavern, the cavern spacing a, the turning radius b, and the site area constraints, and with the objectives of minimizing the number of gas storage caverns and minimizing the difference between the lengths of the long and short sides, the short side length x and the long side length y of the innermost ring gas storage cavern in the compressed gas energy storage system, as well as the number of gas storage caverns n in the compressed gas energy storage system, are calculated. In a compressed air energy storage system, the total length of n gas storage chambers is greater than or equal to the shortest length of the gas storage chambers. The site area is limited by area constraints. The maximum area S of the compressed gas energy storage system is determined based on the site conditions. The area of ​​the outermost gas storage chamber in the compressed gas energy storage system is less than S.

2. The method for designing the layout of artificial gas storage caverns in a compressed gas energy storage system according to claim 1, characterized in that, In a ring-shaped compressed air energy storage system, the total length of n gas storage chambers is greater than or equal to the shortest length of the gas storage chambers. 。 3. The method for designing the layout of artificial gas storage caverns in a compressed gas energy storage system according to claim 1, characterized in that, The site area is limited by area constraints. The maximum area S of the compressed air energy storage system is determined based on site conditions. The area of ​​the outermost ring of gas storage chambers in the concentric compressed air energy storage system is less than S. 。 4. The method for designing the layout of artificial gas storage caverns in a compressed gas energy storage system according to claim 1, characterized in that, In a parallel-arranged compressed air energy storage system, the total length of n gas storage chambers is greater than or equal to the shortest length of the gas storage chambers. 。 5. The method for designing the layout of artificial gas storage caverns in a compressed gas energy storage system according to claim 1, characterized in that, The site area is limited by area constraints. The maximum area S of the compressed air energy storage system is determined based on site conditions. The area of ​​the outermost ring of gas storage chambers in a parallel compressed air energy storage system is less than S. 。 6. The method for designing the layout of artificial gas storage caverns in a compressed gas energy storage system according to claim 1, characterized in that, The distance a between two adjacent gas storage chambers is greater than or equal to 5D.

7. The method for designing the layout of artificial gas storage caverns in a compressed gas energy storage system according to claim 1, characterized in that, The turning radius b of the turning segment is greater than or equal to 3D.

8. A compressed air energy storage system, characterized in that: The compressed air energy storage system adopts a ring-type or parallel arrangement; The compressed air energy storage system with a ring arrangement has n gas storage chambers, n≥1, each gas storage chamber is arranged in a ring, and the n gas storage chambers are arranged concentrically and arranged in rings with equal spacing from the inside to the outside. The parallel-arranged compressed air energy storage system has n gas storage chambers, each of which is arranged in a ring. The n gas storage chambers are arranged in parallel at equal intervals in the same plane. The gas storage chamber is arranged in a rectangular ring shape, including two long side segments and two short side segments, as well as a turning segment connecting adjacent long side segments and short side segments; The diameter of the end face of the gas storage chamber is D, the distance between two adjacent gas storage chambers is a, and the radius of the turning section is b. Based on the required storage volume V of the compressed gas energy storage system and the diameter D of the end face of the gas storage chamber, determine the shortest length of the gas storage chamber in the compressed gas energy storage system. Based on the minimum length of the gas storage cavern, the cavern spacing a, the turning radius b, and the site area constraints, and with the objectives of minimizing the number of gas storage caverns and minimizing the difference between the lengths of the long and short sides, the short side length x and the long side length y of the innermost ring gas storage cavern in the compressed gas energy storage system, as well as the number of gas storage caverns n in the compressed gas energy storage system, are calculated. In a compressed air energy storage system, the total length of n gas storage chambers is greater than or equal to the shortest length of the gas storage chambers. The site area is limited by area constraints. The maximum area S of the compressed gas energy storage system is determined based on the site conditions. The area of ​​the outermost gas storage chamber in the compressed gas energy storage system is less than S.

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