Compressed gas energy storage reservoir and method of forming same

Abstract

The application provides a compressed gas energy storage gas reservoir and a forming method thereof. The compressed gas energy storage gas reservoir comprises a permanent rock roadway of an abandoned coal mine roadway, and the permanent rock roadway comprises a transportation main roadway and an air return main roadway. The roadway of the transportation main roadway and the air return main roadway is initially reinforced by a first thickness support and secondarily reinforced by a second thickness support. The roadway is matched by a telescopic mortise and tenon structure in an axial direction, and the expansion joint of the telescopic mortise and tenon structure is sealed by rubber. Three telescopic mortise and tenon structures are arranged in a ring direction, both ends of the roadway are blocked, and the end of the roadway close to the gas storage station is used as a gas injection end. The gas injection end is provided with a gas injection hole and a gas injection pipeline. The application is formed by transforming the abandoned coal mine roadway. The application can not only effectively deal with the economic and social problems after the mine is abandoned, but also can reduce the peak and fill the valley, reduce the abandoned light and wind, support the stability of the power grid and the wind and light power generation, and the whole structure is stable and has good sealing performance.

Description

Technical Field

[0001] The present invention relates to the technical field of physical energy storage, and in particular to a compressed air energy storage reservoir and a method for forming the compressed air energy storage reservoir. Background Art

[0002] In my country's energy consumption structure, fossil energy, especially coal, occupies a dominant position. Under the background of "dual carbon", the energy structure is transforming from coal-based to diversified. Coal production capacity has entered a period of contraction, coal mines are accelerating their withdrawal, and the life cycle of mines has ended or is gradually ending, resulting in a substantial increase in abandoned underground space, which will in turn lead to a series of economic and social problems. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a compressed air energy storage reservoir.

[0004] The present invention also provides a method for forming a compressed air energy storage reservoir.

[0005] The technical solution adopted in the present invention is as follows:

[0006] The first aspect of the present invention proposes a compressed air energy storage gas storage reservoir, which is transformed from a permanent rock tunnel of an abandoned coal mine tunnel. The permanent rock tunnel includes: a transport tunnel and a return air tunnel, wherein the tunnels of the transport tunnel and the return air tunnel are initially reinforced with a first thickness support and second thickness support for secondary reinforcement, the second thickness is greater than the first thickness, the tunnels of the transport tunnel and the return air tunnel are matched with a telescopic mortise and tenon structure in the axial direction, and the expansion joints of the telescopic mortise and tenon structure are sealed with rubber, and the three telescopic mortise and tenon structures arranged in the circumferential direction of the tunnels of the transport tunnel and the return air tunnel block both ends of the tunnel, and the end of the tunnel closer to the gas storage station is used as the gas injection end, and the gas injection end is provided with a gas injection hole and a gas injection pipe, and the gas injection hole is connected to the ground gas storage station through the gas injection pipe.

[0007] The compressed gas energy storage reservoir proposed in the present invention also has the following additional technical features:

[0008] According to one embodiment of the present invention, the secondary reinforcement adopts a three-center circle lining, and the three-center circle is composed of three arcs with different centers.

[0009] According to one embodiment of the present invention, the thickness of the rubber is 1-2 mm.

[0010] According to one embodiment of the present invention, the first thickness is 5-10 cm, and the second thickness is 30-35 cm.

[0011] According to one embodiment of the present invention, the three telescopic mortise and tenon structures arranged in the circumferential direction of the tunnel are respectively located at the bottom of the tunnel, the upper left end at 120° to the bottom of the tunnel, and the upper right end at 120° to the bottom of the tunnel.

[0012] According to one embodiment of the present invention, the gas injection end is trapezoidal.

[0013] The second aspect of the present invention proposes a method for forming a compressed air energy storage gas storage reservoir, comprising the following steps: the transport main tunnel of the permanent rock tunnel of the abandoned coal mine tunnel and the return air main tunnel are initially reinforced with a first thickness support; the transport main tunnel of the permanent rock tunnel of the abandoned coal mine tunnel and the return air main tunnel are secondary reinforced with a second thickness support, the second thickness being greater than the first thickness; the transport main tunnel and the return air main tunnel are matched in the axial direction using a telescopic mortise and tenon structure, and the expansion joint of the telescopic mortise and tenon structure is sealed with rubber; three telescopic mortise and tenon structures are arranged in the circumferential direction of the transport main tunnel and the return air main tunnel; both ends of the tunnel are sealed, and the end of the tunnel closer to the gas storage station is used as the gas injection end, and a gas injection hole and a gas injection pipeline are arranged at the gas injection end, and the gas injection hole is connected to the ground gas storage station through the gas injection pipeline.

[0014] The method for forming the compressed gas energy storage reservoir of the present invention also has the following additional technical features:

[0015] According to one embodiment of the present invention, the secondary reinforcement adopts a three-center circle lining, and the three-center circle is composed of three arcs with different centers.

[0016] According to one embodiment of the present invention, the three telescopic mortise and tenon structures arranged in the circumferential direction of the tunnel are respectively located at the bottom of the tunnel, the upper left end at 120° to the bottom of the tunnel, and the upper right end at 120° to the bottom of the tunnel.

[0017] According to one embodiment of the present invention, the gas injection end is trapezoidal

[0018] The present invention has the following beneficial effects:

[0019] The present invention is made by transforming abandoned coal mine tunnels. It can not only effectively deal with the economic and social problems after the mine is closed, but also can reduce peak load and valley load, reduce the abandonment of solar and wind power, and provide support for the stability of the power grid and wind and solar power generation.

[0020] The lining is reinforced twice, which makes the load-bearing more uniform, improves the overall mechanical bearing performance of the lining, makes the whole more stable, and increases the service life;

[0021] The linings are connected by mortise and tenon structure, which is simple to install and has low on-site construction difficulty, thus greatly saving construction time.

[0022] Sealing materials are used in all gaps of the entire structure, and the greater the pressure, the tighter the mortise and tenon fit and the better the airtightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic cross-sectional structural diagram of a tunnel according to one embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of the axial and reversing direction of a roadway according to one embodiment of the present invention;

[0025] Figure 3 is an enlarged view of a telescopic mortise and tenon structure according to one embodiment of the present invention;

[0026] Figure 4 is a top view of a laneway according to one embodiment of the present invention;

[0027] Figure 5 It is a flow chart of a method for forming a compressed gas energy storage reservoir according to one embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] The present invention is made based on the inventor's research and understanding of the following problems:

[0030] With the accelerated closure of coal mines, the life cycle of mines has already or is gradually ending, resulting in a significant increase in abandoned underground space, which will lead to a series of economic and social problems. If abandoned underground space can be used for gas storage, it will not only alleviate the pressure of gas peak regulation and supply, but also have important significance for the transformation of resource-depleted cities in my country. Using abandoned mines for compressed gas energy storage can not only effectively address the economic and social problems after mine closure, but also can reduce peak loads and valley loads, reduce the curtailment of solar and wind power, and provide support for the stability of the power grid and wind and solar power generation. In addition, the vast underground space of abandoned mines can achieve long-term, high-power storage and release of electricity, and save investment and operating costs.

[0031] Because gas molecules are widely spaced and highly fluid, utilizing the underground space of abandoned mines for compressed air energy storage requires ensuring the storage space is airtight. Due to a lack of regular maintenance, the tunnel linings in abandoned mines can crack over time, compromising the tunnel's airtightness. Using arch reinforcement or integral arch replacement is not only cumbersome, but also difficult to maintain over time.

[0032] The following describes the compressed gas energy storage reservoir and its formation method proposed in the embodiment of the present invention with reference to the accompanying drawings.

[0033] The compressed gas storage reservoir is transformed from the permanent rock tunnel of the abandoned coal mine. The permanent rock tunnel includes: transport tunnel and return air tunnel. The transport tunnel and return air tunnel adopt the first thickness support for primary reinforcement and the second thickness support for secondary reinforcement (secondary lining). The second thickness is greater than the first thickness. Figure 1-2 As shown, the transport main tunnel and the return air main tunnel are matched with each other in the axial direction using a telescopic mortise and tenon structure 1, and the expansion joint of the telescopic mortise and tenon structure 1 is sealed with rubber. The three telescopic mortise and tenon structures 1 are set in the circumferential direction of the transport main tunnel and the return air main tunnel to seal both ends of the tunnel, and the end of the tunnel closer to the gas storage station is used as the gas injection end, and the gas injection end is provided with a gas injection hole and a gas injection pipeline, and the gas injection hole is connected to the ground gas storage station through the gas injection pipeline.

[0034] The structure of the telescopic mortise and tenon structure 1 can refer to Figure 3 shown.

[0035] In a specific embodiment of the present invention, the thickness of the rubber may be 1-2 mm, the first thickness may be 5-10 cm, and the second thickness may be 30-35 cm.

[0036] Furthermore, if Figure 1 As shown, the secondary reinforcement adopts tri-center circle lining, which consists of three arcs with different centers.

[0037] Furthermore, in one embodiment of the present invention, Figure 4 As shown, the three telescopic mortise and tenon structures 1 arranged in the circumferential direction of the tunnel are respectively located at the bottom of the tunnel, the upper left end at 120° to the bottom of the tunnel, and the upper right end at 120° to the bottom of the tunnel.

[0038] In one embodiment of the present invention, Figure 5 As shown, the gas injection end is trapezoidal.

[0039] Specifically, both ends of the tunnel are blocked, and a gas injection hole and a gas injection pipeline are set at the end closer to the gas storage station. The port at the gas injection end is set to a trapezoidal structure, and the gas injection hole is connected to the gas storage station on the ground through a pipeline. When gas is stored, gas is injected from the gas storage station through the pipeline and the gas injection hole. As the gas increases, the pressure in the tunnel gradually increases. The pressure forces the port to push the lining forward, the mortise and tenon fit becomes higher and higher, and the airtightness inside the tunnel becomes better and better.

[0040] In summary, the compressed air energy storage reservoir according to the embodiment of the present invention is transformed from an abandoned coal mine tunnel, which can not only effectively deal with the economic and social problems after the mine is withdrawn, but also can reduce peaks and fill valleys, reduce the abandonment of solar and wind power, and provide support for the stability of the power grid and wind and solar power generation; the lining is reinforced twice, and the load is relatively uniform, which improves the overall mechanical bearing performance of the lining, makes the whole more stable, and increases the service life; the linings are spliced ​​with mortise and tenon structure, which is simple to install and has little difficulty in on-site construction, which can greatly save construction time; sealing materials are used in all gaps of the entire structure, and the greater the pressure, the higher the degree of fit of the mortise and tenon, and the better the airtightness.

[0041] Figure 5 FIG. 1 is a flow chart of a method for forming a compressed gas energy storage reservoir according to an embodiment of the present invention. Figure 1 As shown, the method includes the following steps:

[0042] S1, the first thickness support is used to carry out the initial reinforcement of the main transport tunnel and the main return air tunnel of the permanent rock tunnel of the abandoned coal mine.

[0043] S2, the transport tunnel and return air tunnel of the permanent rock tunnel of the abandoned coal mine tunnel are reinforced twice by using the second thickness support, and the second thickness is greater than the first thickness.

[0044] S3. The transport tunnel and the return air tunnel are matched in the axial direction using a telescopic mortise and tenon structure, and the expansion joints of the telescopic mortise and tenon structure are sealed with rubber.

[0045] S4, three telescopic mortise and tenon structures are set in the circumferential direction of the transport tunnel and the return air tunnel.

[0046] S5: Both ends of the tunnel are blocked, and the end of the tunnel closer to the gas storage station is used as the gas injection end. A gas injection hole and a gas injection pipeline are set at the gas injection end, and the gas injection hole is connected to the ground gas storage station through the gas injection pipeline.

[0047] According to one embodiment of the present invention, the secondary reinforcement adopts a three-center circle lining, and the three-center circle is composed of three arcs with different centers.

[0048] According to one embodiment of the present invention, three telescopic mortise and tenon structures arranged in the circumferential direction of the tunnel are respectively located at the bottom of the tunnel, the upper left end at 120° to the bottom of the tunnel, and the upper right end at 120° to the bottom of the tunnel.

[0049] According to one embodiment of the present invention, the gas injection end is trapezoidal.

[0050] In summary, according to the method for forming a compressed air energy storage reservoir in an embodiment of the present invention, it is formed by transforming abandoned coal mine tunnels, which can not only effectively deal with the economic and social problems after the mine is withdrawn, but also can reduce peaks and fill valleys, reduce the abandonment of solar and wind power, and provide support for the stability of the power grid and wind and solar power generation; the lining is reinforced twice, the load is relatively uniform, and the overall mechanical bearing performance of the lining is improved, making the whole more stable and increasing the service life; the lining is spliced ​​with a mortise and tenon structure, which is simple to install and has little difficulty in on-site construction, which can greatly save construction time; sealing materials are used in all gaps of the entire structure, and the greater the pressure, the higher the degree of fit of the mortise and tenon, and the better the airtightness.

[0051] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0052] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0053] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0054] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A compressed gas energy storage reservoir, characterized in that: The compressed gas energy storage reservoir is transformed from the permanent rock tunnel of the abandoned coal mine tunnel. The permanent rock tunnel includes: the transport tunnel and the return air tunnel. The transport tunnel and the return air tunnel are reinforced initially with support of a first thickness and reinforced secondary with support of a second thickness, wherein the second thickness is greater than the first thickness. The transport tunnel and the return air tunnel are matched in the axial direction with a telescopic mortise and tenon structure, and the expansion joints of the telescopic mortise and tenon structure are sealed with rubber. Three telescopic mortise and tenon structures are arranged in the circumferential direction of the transport tunnel and the return air tunnel to seal both ends of the tunnel. The end of the tunnel closer to the gas storage station is used as the gas injection end, and the gas injection end is provided with a gas injection hole and a gas injection pipeline, and the gas injection hole is connected to the ground gas storage station through the gas injection pipeline. The secondary reinforcement adopts a three-center circle lining, wherein the three-center circle is composed of three arcs with different centers; The gas injection end is trapezoidal.

2. The compressed gas energy storage reservoir according to claim 1, characterized in that: The thickness of the rubber is 1-2 mm.

3. The compressed gas energy storage reservoir according to claim 1, characterized in that: The first thickness is 5-10 cm, and the second thickness is 30-35 cm.

4. The compressed gas energy storage reservoir according to claim 1, characterized in that: The three telescopic mortise and tenon structures arranged in the circumferential direction of the lane are respectively located at the bottom of the lane, the upper left end at an angle of 120° to the bottom of the lane, and the upper right end at an angle of 120° to the bottom of the lane.

5. A method for forming a compressed gas energy storage reservoir, characterized in that: The following steps are involved: The main transport tunnel and the main return air tunnel of the permanent rock tunnel in the abandoned coal mine are reinforced with the first thickness support; The transport main tunnel of the permanent rock tunnel of the abandoned coal mine tunnel and the return air main tunnel are reinforced with a second thickness support, the second thickness is greater than the first thickness, and the secondary reinforcement adopts a three-center circle lining, the three-center circle is composed of three arcs with different centers; The transport lane and the return air lane are matched in the axial direction using a telescopic mortise and tenon structure, and the expansion joints of the telescopic mortise and tenon structure are sealed with rubber; The transport lane and the return air lane are provided with three telescopic mortise and tenon structures in the circumferential direction; Both ends of the tunnel are blocked, and the end of the tunnel closer to the gas storage station is used as the gas injection end. A gas injection hole and a gas injection pipeline are set at the gas injection end. The gas injection hole is connected to the ground gas storage station through the gas injection pipeline. The gas injection end is trapezoidal.

6. The method for forming a compressed gas energy storage reservoir according to claim 5, characterized in that: The three telescopic mortise and tenon structures arranged in the circumferential direction of the lane are respectively located at the bottom of the lane, the upper left end at an angle of 120° to the bottom of the lane, and the upper right end at an angle of 120° to the bottom of the lane.

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