Waste mine hole used as compressed air storage cavern

Abstract

The utility model provides a discarded mine hole used as a compressed air storage cavern, which comprises a mine hole body, a circle of steel lining is arranged on the peripheral side of the inner side wall of the mine hole body, the circle of steel lining is formed by splicing a plurality of steel linings along the peripheral side of the inner side wall of the mine hole body, and a concrete lining is arranged between the steel linings and the mine hole body. The cross section outline of the circle of steel lining is equal-proportion reduction of the hole cross section outline of the mine hole body. According to the abandoned mine cavern used as the compressed air storage cavern, the steel linings are designed according to the shape and the size of the section of the existing cavern in an equal-proportion reduction mode, the special-shaped compressed air storage cavern with the equal lining thickness is formed, expanding excavation is not needed in the whole arrangement mode, and the existing space is fully utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of compressed air energy storage, in particular to an abandoned mine cave used as a compressed air storage. Background Art

[0002] Large-scale compressed air energy storage power stations generally use underground space as compressed air storage. Common underground space energy storage reservoirs include salt caverns, aquifers, depleted oil and gas fields, abandoned mines and artificial caverns. With the increasing number of abandoned coal mines and metal mines in my country, directly closing these mines will not only waste space resources but also may induce some safety and environmental problems. Using existing abandoned mines as compressed air storage is an effective way to realize the utilization of mine resources.

[0003] The subsequent energy storage utilization was not considered during the excavation of the mine cave, the support was simple, and the excavation section was nearly rectangular or gate-shaped. In order to ensure the stability and airtightness of high-pressure gas storage, the mine cave needs to be transformed. Thin steel lining has the advantages of being airtight, having high tensile strength and good thermal stability, and is currently favored by domestic underground gas storage cavern projects. How to make the most of the existing mine cave space while ensuring the stability and airtightness of the mine cave is the key to mine cave transformation. Utility Model Content

[0004] The main purpose of the utility model is to provide an abandoned mine cave used as a compressed air 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 abandoned mine cave used as a compressed air storage reservoir includes a mine cave body, characterized in that: a circle of steel lining is provided on the inner side wall of the mine cave body, the circle of steel lining is formed by splicing multiple steel linings along the inner side wall of the mine cave body, and a concrete lining is provided between the steel lining and the mine cave body; the cross-sectional profile of the circle of steel lining is a proportional reduction of the cross-sectional profile of the mine cave 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: the sharp angle connection of the steel lining is rounded.

[0009] As a preferred technical solution of the utility model: a circle of steel lining is formed by splicing four pipe segments: upper, lower, left and right.

[0010] As a preferred technical solution of the utility model: the sharp angle connection between the left and right pipe segments and the lower pipe segment is rounded.

[0011] As a preferred technical solution of the utility model: the rounding radius is 2-3m.

[0012] As a preferred technical solution of the utility model: the thickness of the reserved concrete lining between the steel lining and the inner side wall of the mine cave body is 50-80cm.

[0013] The utility model provides an abandoned mine cave used as a compressed air storage, which has the following beneficial effects: a steel lining is designed in proportion to the cross-sectional shape and size of an existing cavern to form a special-shaped compressed air storage with equal lining thickness; the entire layout does not require expansion and excavation and fully utilizes the existing space. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the cross-sectional structure of an abandoned mine cave used as a compressed air storage provided by the utility model;

[0015] In the figure: 1- steel lining; 2- concrete lining; 3- mine body. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 As shown, an abandoned mine cave used as a compressed air storage includes a mine cave body 3, and a circle of steel lining 1 is provided on the inner wall of the mine cave body 3. The circle of steel lining 1 is formed by splicing multiple steel linings along the inner wall of the mine cave body 3, and a concrete lining 2 is provided between the steel lining 1 and the mine cave body 3; the cross-sectional profile of the circle of steel lining 1 is a proportional reduction of the cross-sectional profile of the mine cave body 3.

[0018] The sharp angle joints of the steel lining 1 are rounded.

[0019] A circle of steel lining 1 is formed by splicing four pipe segments, namely, upper, lower, left and right.

[0020] The sharp angle connections between the left and right segments and the lower segment are rounded.

[0021] The fillet radius is 2-3m.

[0022] The thickness of the reserved concrete lining 2 between the steel lining 1 and the inner wall of the mine body 3 is 50-80 cm.

[0023] Specifically, the abandoned mine cave used as a compressed air storage is implemented in the following manner:

[0024] In the preparation stage, first collect data on the abandoned mine 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 of the mine body 3, cavern length, cross-sectional shape and size, overall volume of the cavern and other information; according to the cross-sectional shape and size of the mine body 3, design the shape and size of the steel lining 1. A circle of steel lining 1 is composed of four pipe segments: upper, lower, left and right. The sharp angle connection between the left and right steel linings 1 and the lower steel lining 1 is rounded with a rounding radius of 2-3m, and appropriate thickening is performed here.

[0025] During the renovation construction, the steel lining 1 pipe segments are first transported to the mine cave, assembled and welded from bottom to top to form a fully enclosed steel lining 1 sealing layer. An equal thickness spacing of 50-80cm is reserved between the steel lining 1 and the mine cave body 3. After the welding of this section of steel lining 1 is completed, the reserved space between the steel lining 1 and the mine cave body 3 is backfilled with concrete. Backfill grouting and contact grouting are used to form a concrete lining 2 that fits the sealing material tightly. The steel lining 1 is laid and backfilled in turn according to the length of each section of the steel lining until the renovation of all the caverns is completed. Finally, the inlet and outlet pipes are reserved, and the existing cavern openings are blocked to form a gas storage system. The pipelines are connected to the ground unit system to form a compressed air energy storage power station.

[0026] 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.

[0027] 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 abandoned mine cave used as a compressed air storage, comprising a mine cave body (3), characterized in that: A circle of steel lining (1) is provided on the inner wall of the mine cave body (3), the circle of steel lining (1) is formed by splicing a plurality of steel linings along the inner wall of the mine cave body (3), and a concrete lining (2) is provided between the steel lining (1) and the mine cave body (3); The cross-sectional profile of a circle of steel lining (1) is a proportional reduction of the cross-sectional profile of the mine body (3).

2. The abandoned mine cave used as a compressed air storage according to claim 1, characterized in that: The sharp angle connections of the steel lining (1) are rounded.

3. The abandoned mine cave used as a compressed air storage according to claim 2, characterized in that: The fillet radius is 2-3m.

4. The abandoned mine cave used as a compressed air storage according to claim 1, characterized in that: A circle of steel lining (1) is formed by splicing four pipe segments, namely, upper, lower, left and right.

5. The abandoned mine cave used as a compressed air storage according to claim 4, characterized in that: The sharp angle connections between the left and right segments and the lower segment are rounded.

6. The abandoned mine cave used as a compressed air storage according to claim 5, characterized in that: The fillet radius is 2-3m.

7. The abandoned mine cave used as a compressed air storage according to claim 1, characterized in that: The thickness of the reserved concrete lining (2) between the steel lining (1) and the inner wall of the mine cave body (3) is 50-80 cm.

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