Underground air storage cavern for compressed air energy storage

Abstract

The utility model provides an underground air storage cavern for compressed air energy storage, which comprises an existing cavern body with a three-centered circular arch at the top, and is characterized in that two circular steel linings which are arranged up and down or left and right are arranged on the inner side of the existing cavern body; and a concrete lining is filled between the circular steel lining and the existing cavern body. And according to the size of the section of the existing cavern, backfilling and sealing are conducted, and two circular tunnel type compressed air reservoirs are formed. The whole structural form meets the circular ring form of a conventional steel lining, the material manufacturing and construction cost of the special-shaped steel lining is reduced, expanding excavation is not needed for transformation, and the problem of disturbance instability of the cavern is solved. The utility model is suitable for the conditions that the section size of the existing cavern is larger and the stability of surrounding rock is better.

Description

Technical Field

[0001] The utility model relates to the technical field of compressed air energy storage, and in particular to an underground air storage cavern for compressed air energy storage. Background Art

[0002] The gas storage device is an important component of the compressed air energy storage power station. Now the engineering project uses underground caverns as compressed air storage. In addition to newly dug artificial caverns, salt caverns and other natural spaces, existing mine caverns are a major space resource for storing compressed air. my country has abundant existing cavern resources, most of which are idle. Using existing underground caverns for transformation is a major way to achieve mine-land integration and resource reuse.

[0003] The three-center circular arch form has the advantages of small roof breakage, high space utilization, and good self-stressing performance. Therefore, this form is often used in existing caverns. Existing caverns as compressed air storage must meet the stability and airtightness of long-term high-pressure storage, but the existing three-center circular arch caverns do not match the circular steel lining form. The existing three-center circular arch caverns need to be modified to meet the compressed air energy storage requirements. Utility Model Content

[0004] The main purpose of the utility model is to provide an underground gas storage cavern for compressed air energy storage, hoping to effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An underground gas storage cavern for compressed air energy storage comprises an existing cavern body, the top of the existing cavern body having a three-center circular arch, and is characterized in that two circular steel liners arranged up and down or left and right are provided on the inner side of the existing cavern body, and a concrete lining is filled between the circular steel liners and the existing cavern body.

[0007] While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:

[0008] As a preferred technical solution of the utility model: when the height of the existing cavern body (3) is greater than the width, two circular steel liners are arranged on the upper and lower sides.

[0009] As a preferred technical solution of the utility model: when the width of the existing cavern body is greater than the height, two circular steel liners are arranged on the left and right.

[0010] As a preferred technical solution of the utility model: the shortest distance between the circular steel lining and the side wall profile of the existing cavern body is 50-80cm.

[0011] As a preferred technical solution of the utility model: the spacing between the two circular steel liners is 100-160cm.

[0012] As a preferred technical solution of the utility model: the diameter of the circular steel liner = the long side of the existing cavern body - the distance between the two circular steel liners / 2; the long side is the width or the height.

[0013] As a preferred technical solution of the utility model: the circular steel liner is formed by assembling and welding multiple steel liners.

[0014] As a preferred technical solution of the utility model: a frame is also built in the existing cavern body, and the frame is used to fix the two circular steel liners arranged above and below.

[0015] The utility model provides an underground gas storage cavern for compressed air energy storage, which has the following beneficial effects: according to the existing cavern section size, backfilling and sealing are performed to form two circular tunnel-type compressed air storage depots. The entire structural form meets the circular ring shape of conventional steel linings, reduces the material manufacturing and construction costs of special-shaped steel linings, and the transformation does not require expansion and digging, avoiding the disturbance instability problem of the cavern. The utility model is suitable for the situation where the existing cavern section size is large and the surrounding rock stability is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the upper and lower arrangement of a circular steel liner of an underground gas storage cavern for compressed air energy storage provided by the utility model;

[0017] Figure 2 This is a schematic diagram of the left and right arrangement of the circular steel lining;

[0018] In the figure: 1-circular steel lining; 2-concrete lining; 3-existing cavern body. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1-2 As shown, an underground gas storage cavern for compressed air energy storage includes an existing cavern body 3, the top of the existing cavern body 3 has a three-center circular arch, the inner side of the existing cavern body 3 is provided with two circular steel liners 1 arranged up and down or left and right, and a concrete lining 2 is filled between the circular steel liners 1 and the existing cavern body 3.

[0021] When the height of the existing cavern body 3 is greater than the width, two circular steel liners 1 are arranged on top and on the bottom.

[0022] When the width of the existing cavern body 3 is greater than the height, two circular steel liners 1 are arranged on the left and right.

[0023] The shortest distance between the circular steel lining 1 and the side wall profile of the existing cavern body 3 is 50-80 cm.

[0024] The distance between the two circular steel liners 1 is 100-160 cm.

[0025] The diameter of the circular steel lining = the long side of the existing cavern body - the distance between two circular steel liners / 2; the long side is the width or height.

[0026] The circular steel liner 1 is formed by assembling and welding a plurality of steel liners.

[0027] A frame is also built inside the existing cavern body 3, and the frame is used to fix the two circular steel liners 1 arranged above and below.

[0028] Specifically, the underground gas storage cavern for compressed air energy storage is implemented in the following manner:

[0029] In the preparation stage, first collect data on the existing cavern body 3, including geological topography, hydrological climate, land properties, etc., to clarify whether there are basic conditions for building a compressed air energy storage power station; if the conditions are met, determine the basic layout form of the existing cavern body 3, cavern length, cross-sectional shape and size, overall volume of the cavern and other information; design the basic layout of the compressed air storage reservoir based on the cross-sectional shape and size of the existing cavern body 3. When the height of the existing cavern body 3 is greater than the width, the two circular steel liners 1 are arranged on the upper and lower sides; when the width of the existing cavern body 3 is greater than the height, the two circular steel liners 1 are arranged on the left and right sides.

[0030] During the renovation construction, the circular steel lining 1 is designed according to the corresponding size and then transported to the existing cavern body 3 for welding. The shortest distance between the circular steel lining 1 and the side wall contour of the existing cavern body 3 is 50-80cm, and the distance between the two circular steel liners 1 is 100-160cm. The diameter of the circular steel lining = the long side of the existing cavern body (width / height) - the distance between the two circular steel liners / 2. When the upper and lower circular steel liners 1 are arranged, a frame is built to fix the circular steel liners 1. The lower circular steel lining 1 is constructed first. After meeting the strength requirements , and then carry out the welding of the upper circular steel lining 1. After the welding of this section of circular steel lining 1 is completed, the reserved space between the circular steel lining 1 and the existing cavern body 3 is backfilled with concrete, and backfill grouting and contact grouting are used to form a concrete lining 2 that fits tightly with the sealing material. The circular steel lining 1 is laid and backfilled in turn according to the length of each section of the steel lining until the transformation of all caverns is completed. Finally, reserve the inlet and outlet pipes, and seal the existing cavern opening to form a gas storage system. The pipes are connected to the ground unit system to form a compressed air energy storage power station.

[0031] After the transformation is completed, a certain amount of compressed air is injected for trial operation. The airtightness of the cavern is tested through the internal pressure and temperature monitoring system. If the daily leakage rate of the cavern is less than 1%, that is, the airtightness test is qualified, the transformed mine can be put into compressed air energy storage operation.

[0032] The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. An underground gas storage cavern for compressed air energy storage, comprising an existing cavern body (3), wherein the top of the existing cavern body (3) has a three-center circular arch, characterized in that: Two circular steel liners (1) arranged on the upper and lower sides or on the left and right sides are provided inside the existing cavern body (3), and a concrete lining (2) is filled between the circular steel liners (1) and the existing cavern body (3).

2. The underground gas storage cavern for compressed air energy storage according to claim 1, characterized in that: When the height of the existing cavern body (3) is greater than its width, two circular steel liners (1) are arranged on top and bottom.

3. The underground gas storage cavern for compressed air energy storage according to claim 1, characterized in that: When the width of the existing cavern body (3) is greater than its height, two circular steel liners (1) are arranged on the left and right.

4. The underground gas storage cavern for compressed air energy storage according to claim 1, characterized in that: The shortest distance between the circular steel lining (1) and the side wall profile of the existing cavern body (3) is 50-80 cm.

5. The underground gas storage cavern for compressed air energy storage according to claim 1, characterized in that: The distance between the two circular steel liners (1) is 100-160 cm.

6. The underground gas storage cavern for compressed air energy storage according to claim 1, 4 or 5, characterized in that: The diameter of the circular steel lining = the long side of the existing cavern body - the distance between the two circular steel liners / 2; The long side is the width or the height.

7. The underground gas storage cavern for compressed air energy storage according to claim 1, characterized in that: The circular steel liner (1) is formed by assembling and welding a plurality of steel liners.

8. The underground gas storage cavern for compressed air energy storage according to claim 1, characterized in that: A frame is also built inside the existing cavern body (3), and the frame is used to fix the two circular steel liners (1) arranged above and below.

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