Flexible sealing structure of compressed air energy storage artificial chamber gas storage and construction method of flexible sealing structure

Abstract

The invention provides a compressed air energy storage artificial chamber gas storage flexible sealing structure and a construction method thereof.The structure is used for a secondary lining layer of a gas storage and comprises a sealing base layer, a bottom layer, a middle layer and a surface layer which sequentially cover the secondary lining layer from outside to inside; through the structure, the crack resistance and the flexible sealing performance of the gas storage are achieved; the construction method applied to the flexible sealing structure of the compressed air energy storage artificial chamber gas storage comprises the steps that S1, secondary lining surface cleaning is conducted; s2, sealing base layer construction; s3, polishing the sealing base layer; s4, construction of a sealing bottom layer; s5, construction of a sealing middle layer; and S6, sealing surface layer construction. Through the sealing structure and the construction method, the sealing performance can be improved; construction cost is reduced; construction period is shortened; and meanwhile, the beneficial effects of corrosion resistance and wear resistance are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a flexible sealing structure of an artificial chamber gas storage reservoir for compressed air energy storage and a construction method thereof. Background Art

[0002] The traditional sealing solution for compressed air energy storage artificial chamber gas storage mainly uses thick steel plates, but this traditional sealing solution has many defects. In terms of construction, thick steel plates require precise cutting, welding and installation, and the process is complex and has high technical requirements, which leads to increased construction costs and longer cycles. During long-term use, thick steel plates are prone to cracks due to stress concentration and material fatigue, resulting in reduced sealing performance and safety hazards. In addition, steel plates are easily corroded in humid and corrosive environments, which may affect the long-term sealing effect of the gas storage. Summary of the invention

[0003] In order to solve these problems, the industry has begun to explore new sealing structural systems. The present invention proposes a flexible sealing structural system consisting of a base layer, a bottom layer, an intermediate layer and a surface layer, which aims to improve the sealing performance, reduce the construction difficulty and maintenance cost, and enhance the corrosion resistance and wear resistance. The structural system makes full use of the characteristics of each layer of material to form a sealing structural system with good crack resistance and excellent sealing performance, providing a strong guarantee for the safe and efficient operation of the compressed air energy storage artificial chamber gas storage.

[0004] One of the technical solutions adopted by the present invention is: a flexible sealing structure of a compressed air energy storage artificial chamber gas storage reservoir, which is used on the secondary lining layer 1 of the gas storage reservoir, and the structure includes:

[0005] The sealing base layer 2, the sealing bottom layer 3, the sealing middle layer 4 and the sealing surface layer 5 are sequentially covered on the secondary lining layer 1 from the outside to the inside;

[0006] The structure achieves the gas storage reservoir's crack resistance and flexible sealing performance.

[0007] Furthermore, the material of the sealing base layer 2 is high-strength putty, and its elastic modulus and compressive strength should be higher than those of the secondary lining layer 1. The putty material is applied on the surface of the secondary lining layer 1 of the gas storage reservoir to fill the holes and defects on the surface of the secondary lining layer 1, eliminate gas, and achieve the effect of gathering cavities.

[0008] Furthermore, the sealing bottom layer 3 is made of high-strength plate material, and the thickness needs to be determined comprehensively according to the set hole diameter and the structural design of the secondary lining layer 1, so as to ensure that the flexible sealing layer structure is not damaged under high-pressure gas pressure and cracking of the secondary lining layer 1.

[0009] Furthermore, the sealing intermediate layer 4 is made of a flexible sealing material with good sealing performance, which is used to transmit pressure and seal.

[0010] Furthermore, the sealing surface layer 5 is a thin film layer with sealing properties, which is used to separate the high-pressure gas in the gas storage reservoir from the sealing intermediate layer 4 and protect the sealing intermediate layer.

[0011] Another technical solution adopted by the present invention is: a construction method for the flexible sealing structure of the above-mentioned compressed air energy storage artificial cavern gas storage reservoir, the method comprising:

[0012] S1. Secondary lining surface cleaning:

[0013] Use an electric angle grinder or electric brush to grind and clean the surface of the secondary lining layer 1, remove the slurry, loose layer and oil stains on the concrete surface, until fresh and solid concrete is exposed;

[0014] S2. Sealing base construction:

[0015] Use a vacuum cleaner to remove the dust after grinding the concrete, stir the sealing base material evenly, and then evenly apply the putty material on the surface of the second lining concrete by spraying, scraping or rolling, so as to form a sealing base 2;

[0016] S3, Grinding of sealing base:

[0017] After the sealing base 2 is hardened, it is fully polished using an angle grinder, and the surface of the sealing base is required to be smooth and free of protrusions;

[0018] S4, Sealing bottom layer construction:

[0019] Use a vacuum cleaner to clean the dust after grinding the sealing base layer 2, then use the positioning equipment of the laser leveler to position and mark the gas storage, and then install the sealing base layer 3. The connection between the sealing base layer 3 and the sealing base layer 2 can be fixed by gluing or riveting, or both. However, when fixing with rivets, the rivet length and rivet spacing should be reasonably set to prevent the secondary lining from being weak due to rivet drilling;

[0020] S5. Construction of sealing middle layer:

[0021] After the installation of the sealing bottom layer 3 in the gas storage is completed, use a vacuum cleaner and a clean towel to clean the dust and stains on the surface of the sealing bottom layer 3, and then start to install the sealing middle layer 4. The overlap of the sealing middle layer 4 should be specially treated to ensure that the overlap has good sealing performance. After the installation of the sealing middle layer 4, a comprehensive quality inspection should be carried out using professional methods to ensure that there are no leaks or defects in all positions of the sealing middle layer 4;

[0022] S6. Sealing surface construction:

[0023] After the construction and quality inspection of the sealing middle layer 4 are completed, the airtight film is laid on the surface of the sealing middle layer 4, and the sealing surface layer 5 is required to be laid neatly and without wrinkles. The sealing surface layer 5 and the sealing middle layer 4 are bonded together, and the overlapping parts of the sealing surface layer 5 should be handled well to ensure that there are no leaks or defects in the overlapping parts.

[0024] The advantages and positive effects of the present invention are:

[0025] (1) Improving the stability of sealing performance: Traditional thick steel plate sealing solutions will have welds of tens of thousands of meters. Quality problems in welds at any position will significantly affect the sealing performance of the gas storage reservoir. The present invention adopts a four-layer flexible sealing system with a close combination of the base layer, bottom layer, middle layer and surface layer. There is no need for steel plate welding, which avoids weld quality problems and improves the stability of the sealing performance of the gas storage reservoir.

[0026] (2) Reduce construction costs and shorten construction period: The self-weight per unit area of ​​the flexible sealing structure system of the present invention is much smaller than that of the steel plate solution, which greatly facilitates the installation and subsequent maintenance of the sealing layer, saves construction costs, and shortens the construction period.

[0027] (3) Excellent design concept: The present invention utilizes a sealing bottom layer to resist cracks generated in the secondary lining of the gas storage reservoir under high internal pressure conditions, achieves the sealing performance of the gas storage reservoir through a sealing middle layer, and protects the sealing middle layer with the help of a sealing surface layer, giving full play to the characteristics of various materials, with a reasonable sealing structure design and excellent sealing performance.

[0028] (4) Good adaptability: The sealing structure system of the present invention has strong flexibility, which enables the sealing layer to adapt to lining structures of different shapes and sizes, and has better adaptability to temperature and pressure changes.

[0029] (5) Enhanced corrosion resistance and wear resistance: The selection of the middle layer and the surface layer materials makes the sealing structure have better corrosion resistance and wear resistance. In a humid and corrosive environment, the sealing structure can still maintain good performance, reducing the risk of sealing failure caused by corrosion and wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a flexible sealing structure of an artificial cavern gas storage reservoir for compressed air energy storage;

[0031] In the figure: 1. Secondary lining layer; 2. Sealing base layer; 3. Sealing bottom layer; 4. Sealing middle layer; 5. Sealing surface layer. DETAILED DESCRIPTION

[0032] In order to better understand the present invention, the present invention is further described below in conjunction with specific embodiments and drawings.

[0033] Example 1

[0034] like Figure 1 As shown, a flexible sealing structure of a compressed air energy storage artificial chamber gas storage reservoir is used on the secondary lining layer 1 of the gas storage reservoir, and the structure includes:

[0035] The sealing base layer 2, the sealing bottom layer 3, the sealing middle layer 4 and the sealing surface layer 5 are sequentially covered on the secondary lining layer 1 from the outside to the inside;

[0036] The structure achieves the gas storage reservoir's crack resistance and flexible sealing performance.

[0037] Furthermore, the material of the sealing base layer 2 is putty, and its elastic modulus and compressive strength should be higher than those of the secondary lining layer 1. The putty material is applied on the surface of the secondary lining layer 1 of the gas storage reservoir to fill the holes and defects on the surface of the secondary lining layer 1, eliminate gas, and achieve the effect of gathering cavities.

[0038] Furthermore, the sealing bottom layer 3 is made of a plate material, and the thickness needs to be determined comprehensively according to the set hole diameter and the structural design of the secondary lining layer 1, so as to ensure that the flexible sealing layer structure is not damaged under high-pressure gas pressure and cracking of the secondary lining layer 1.

[0039] Furthermore, the sealing intermediate layer 4 is made of a flexible sealing material for transmitting pressure and sealing.

[0040] Furthermore, the sealing surface layer 5 is a thin film layer with sealing properties, which is used to separate the high-pressure gas in the gas storage reservoir from the sealing intermediate layer 4 and protect the sealing intermediate layer.

[0041] Example 2

[0042] A construction method for the flexible sealing structure of the compressed air energy storage artificial cavern gas storage reservoir described in the above-mentioned embodiment 1 comprises:

[0043] S1. Secondary lining surface cleaning:

[0044] Use an electric angle grinder or electric brush to grind and clean the surface of the secondary lining layer 1, remove the slurry, loose layer and oil stains on the concrete surface, until fresh and solid concrete is exposed;

[0045] S2. Sealing base construction:

[0046] Use a vacuum cleaner to remove the dust after grinding the concrete, stir the sealing base material evenly, and then evenly apply the putty material on the surface of the second lining concrete by spraying, scraping or rolling, so as to form a sealing base 2;

[0047] S3, Grinding of sealing base:

[0048] After the sealing base 2 is hardened, it is fully polished using an angle grinder, and the surface of the sealing base is required to be smooth and free of protrusions;

[0049] S4, Sealing bottom layer construction:

[0050] Use a vacuum cleaner to clean the dust after grinding the sealing base layer 2, then use the positioning equipment of the laser leveler to position and mark the gas storage, and then install the sealing base layer 3. The connection between the sealing base layer 3 and the sealing base layer 2 can be fixed by gluing or riveting, or both. However, when fixing with rivets, the rivet length and rivet spacing should be reasonably set to prevent the secondary lining from being weak due to rivet drilling;

[0051] S5. Construction of sealing middle layer:

[0052] After the installation of the sealing bottom layer 3 in the gas storage is completed, use a vacuum cleaner and a clean towel to clean the dust and stains on the surface of the sealing bottom layer 3, and then start to install the sealing middle layer 4. The overlap of the sealing middle layer 4 should be specially treated to ensure that the overlap has good sealing performance. After the installation of the sealing middle layer 4, a comprehensive quality inspection should be carried out using professional methods to ensure that there are no leaks or defects in all positions of the sealing middle layer 4;

[0053] S6. Sealing surface construction:

[0054] After the construction and quality inspection of the sealing middle layer 4 are completed, the airtight film is laid on the surface of the sealing middle layer 4, and the sealing surface layer 5 is required to be laid neatly and without wrinkles. The sealing surface layer 5 and the sealing middle layer 4 are bonded together, and the overlapping parts of the sealing surface layer 5 should be handled well to ensure that there are no leaks or defects in the overlapping parts.

[0055] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of this patent.

Claims

1. The flexible sealing structure of the compressed air energy storage artificial chamber gas storage is characterized by: The structure is used on the secondary lining layer (1) of a gas storage reservoir, and comprises: A sealing base layer (2), a bottom layer (3), an intermediate layer (4) and a surface layer (5) are sequentially covered on the secondary lining layer (1) from the outside to the inside; The structure achieves the gas storage reservoir's crack resistance and flexible sealing performance.

2. The flexible sealing structure of the compressed air energy storage artificial chamber gas storage according to claim 1 is characterized in that: The material of the sealing base layer (2) is putty, and its elastic modulus and compressive strength should be higher than those of the secondary lining layer (1). The putty material is applied on the surface of the secondary lining layer (1) of the gas storage reservoir to fill the holes and defects on the surface of the secondary lining layer (1), eliminate gas, and achieve the effect of gathering cavities.

3. The flexible sealing structure of the compressed air energy storage artificial chamber gas storage according to claim 1 is characterized in that: The sealing bottom layer (3) is made of a plate material, the thickness of which needs to be determined comprehensively based on the set tunnel diameter and the structural design of the secondary lining layer (1), so as to ensure that the flexible sealing layer structure is not damaged under the conditions of high-pressure gas pressure and cracking of the secondary lining layer (1).

4. The flexible sealing structure of the compressed air energy storage artificial chamber gas storage according to claim 1 is characterized in that: The sealing intermediate layer (4) is made of a flexible sealing material and is used to transmit pressure and perform sealing functions.

5. The flexible sealing structure of the compressed air energy storage artificial chamber gas storage according to claim 1 is characterized in that: The sealing surface layer (5) is a thin film layer with sealing properties, which is used to separate the high-pressure gas in the gas storage reservoir from the sealing middle layer (4) and protect the sealing middle layer.

6. A construction method for a flexible sealing structure of an artificial cavern gas storage reservoir for compressed air energy storage applied to any one of claims 1 to 5, characterized in that: The method includes: S1. Secondary lining surface cleaning: Use an electric angle grinder or electric brush to grind and clean the surface of the secondary lining layer (1) to remove the slurry, loose layer and oil stains on the concrete surface until fresh and solid concrete is exposed; S2. Sealing base construction: Using a vacuum cleaner to clean the dust after grinding the concrete, stirring the sealing base material evenly, and then applying the putty material evenly on the surface of the secondary lining concrete by spraying, scraping or rolling, thereby forming a sealing base (2); S3, Grinding of sealing base: After the sealing base layer (2) is hardened, it is fully polished using an angle grinder, and the surface of the sealing base layer is required to be smooth and free of protrusions; S4, Sealing bottom layer construction: Use a vacuum cleaner to clean the dust on the sealing base layer (2) after grinding, then use the positioning device of the laser leveler to position and mark the gas storage, and then install the sealing base layer (3). The connection between the sealing base layer (3) and the sealing base layer (2) can be glued or riveted, or both can be used at the same time. However, when rivets are used, the rivet length and rivet spacing should be reasonably set to prevent rivet drilling from causing weak points in the secondary lining; S5. Construction of sealing middle layer: After the installation of the sealing bottom layer (3) in the gas storage tank is completed, the dust and stains on the surface of the sealing bottom layer (3) are cleaned with a vacuum cleaner and a clean towel, and then the sealing middle layer (4) is installed. The overlap of the sealing middle layer (4) should be specially treated to ensure that the overlap has good sealing performance. After the installation of the sealing middle layer (4), a comprehensive quality inspection should be carried out using professional methods to ensure that there are no leaks or defects at all positions of the sealing middle layer (4); S6. Sealing surface construction: After the construction and quality inspection of the sealing middle layer (4) is completed, the airtight film is laid on the surface of the sealing middle layer (4), and the sealing surface layer (5) is required to be laid neatly and without wrinkles. The middle layers (4) are bonded together, and the overlapping parts of the sealing surface layers (5) should be properly processed. Ensure that there are no leaks or defects in the overlapping parts.

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