Semi-underground structure low-pressure gas storage system

Abstract

The utility model belongs to the technical field of gas storages, and particularly relates to a semi-underground structure low-pressure gas storage system which comprises a gas storage, an inner film is arranged at the inner end of an outer film, and an inlet and outlet channel is arranged on the outer side of the outer film and the outer side of the inner film. A gas storage space of the semi-underground structure low-pressure gas storage system is composed of a space part above the ground and an underground space part, the underground space extends to the position below the ground according to the span and the length of an inner film, the relative height of the gas storage is increased, the capacity of the gas storage is increased, and a gas storage bottom foundation is poured around the gas storage space; the sealing structure is used for fixing and sealing the outer film, the inner film and the bottom film and can guarantee stability and safety of underground gas storage space, so that the gas storage space can be effectively increased under the condition that the span, the height and the length of the gas storage are not increased, the occupied area of the gas storage can be greatly reduced under the condition of the same gas storage capacity requirement, and land limitation and land cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas storage caverns, in particular to a semi-underground structure low-pressure gas storage cavern system. Background Technique

[0002] Flexible gas storage caverns using high-performance air film materials are gradually becoming a storage means for storing atmospheric-pressure industrial gases such as natural gas, biogas, and carbon dioxide. Currently, in the application of compressed carbon dioxide energy storage, flexible gas storage caverns using air film materials for storing carbon dioxide on the low-pressure side have become a relatively effective means to promote the application of compressed carbon dioxide energy storage systems.

[0003] The traditional construction method of existing large-capacity low-pressure gas storage caverns for storing atmospheric-pressure or low positive-pressure carbon dioxide gas is generally built on a flat ground. The excessive land area requirement not only greatly restricts the popularization and application of compressed carbon dioxide energy storage systems, but also brings a great increase in the investment cost of the project.

[0004] Therefore, a semi-underground structure low-pressure gas storage cavern system is needed. Content of the Utility Model

[0005] A semi-underground structure low-pressure gas storage cavern system proposed by the utility model solves the problems existing in the prior art that the traditional construction method of large-capacity low-pressure gas storage caverns for storing atmospheric-pressure or low positive-pressure carbon dioxide gas is generally built on a flat ground. The excessive land area requirement not only greatly restricts the popularization and application of compressed carbon dioxide energy storage systems, but also brings a great increase in the investment cost of the project.

[0006] To achieve the above object, the utility model provides the following technical solution: A semi-underground structure low-pressure gas storage cavern system includes a gas storage cavern. An inner membrane is arranged at the inner end of the outer membrane. An access passage is arranged outside the outer membrane and the inner membrane. A foundation part is arranged below the outer membrane. The foundation part includes a semi-underground gas storage cavern accumulation layer piled and cast around the foundation part. The foundation part also includes a gas storage space opened in the middle of the foundation part, and the bottom of the gas storage space is designed as a plane;

[0007] In the middle of the foundation part and located on the inner wall of the gas storage space, a gas storage cavern bottom foundation is cast. The gas storage cavern bottom foundation includes a gas storage cavern beam foundation inside the gas storage cavern floor cast above the semi-underground gas storage cavern accumulation layer.

[0008] Preferably, a bottom membrane is laid inside the gas storage space, and a bottom membrane protection cushion layer is laid between the bottom membrane and the gas storage cavern bottom foundation and the concrete structure around the gas storage cavern.

[0009] Preferably, a gas charging and discharging pipeline system is buried in the ground of the foundation part. The gas charging and discharging pipeline system includes a gas charging and discharging pipeline valve installed outside the gas charging and discharging pipeline system. The other end of the gas charging and discharging pipeline system is connected to a gas charging and discharging pipe network, and the gas charging and discharging pipe network is evenly laid on the bottom film.

[0010] Preferably, a pressure stabilizing control system is fixedly installed on one side of the gas storage tank beam foundation in the ground of the gas storage tank. The pressure stabilizing control system includes an air supply fan and a pipeline. The pressure stabilizing control system includes a pressure stabilizing exhaust port and a pressure stabilizing exhaust pipeline installed on the other side of the gas storage tank beam foundation in the ground of the gas storage tank. The pressure stabilizing control system includes an energy release stage exhaust port arranged on the right side of the gas storage tank beam foundation in the ground of the gas storage tank. The pressure stabilizing control system also includes a sensor installed in the outer film space.

[0011] Preferably, a steel cable net is covered on the outer layer of the outer film, and connecting and fixing parts are fixedly installed around the steel cable net.

[0012] Preferably, the connecting and fixing parts include bolts and gaskets fixedly installed around the outer film. A plurality of reserved holes corresponding to the bolts are formed on the upper end surface of the gas storage tank beam foundation in the ground of the gas storage tank.

[0013] Preferably, a sealing and fixing assembly is fixedly installed around the edge of the outer film. The sealing and fixing assembly includes a sealing gasket that is overlapped and connected with the concrete structure around the gas storage tank up and down.

[0014] Preferably, a plurality of sealing bolts are threadedly connected through the middle of the sealing gasket.

[0015] The utility model provides a semi-underground structure low-pressure gas storage tank system. Compared with the prior art, the beneficial effects of the utility model are as follows:

[0016] 1. By setting the semi-underground structure low-pressure gas storage tank system, the gas storage space of the gas storage tank consists of the space part above the ground and the underground space part. According to the span and length of the inner film, the gas storage space is increased downward, the underground space can be extended downward, the relative height of the gas storage tank can be increased, and the bottom foundation of the gas storage tank is poured around the gas storage space to fix and seal the outer film, inner film and bottom film, which can ensure the stability and safety of the underground gas storage space. Therefore, the gas storage space can be effectively increased without increasing the span, height and length of the gas storage tank. Under the same gas storage capacity requirement, the floor area of the gas storage tank can be greatly reduced, the land restriction can be reduced, and the land use cost can be reduced.

[0017] 2. On the basis of the bottom of the gas storage reservoir of this semi-underground structure low-pressure gas storage reservoir system, a semi-underground gas storage reservoir accumulation layer is piled up, which can increase the height of the surrounding ground of the gas storage reservoir, form a retaining layer of the semi-underground gas storage reservoir, reduce the engineering quantity of underground space excavation, further expand the capacity of the underground gas storage space, and reduce the transportation and unloading cost of earthwork and stonework. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a semi-underground structure low-pressure gas storage reservoir system proposed by the present utility model;

[0019] Figure 2 It is a schematic diagram of the sectional structure of the gas storage reservoir of a semi-underground structure low-pressure gas storage reservoir system proposed by the present utility model;

[0020] Figure 3 It is a schematic diagram of the sealing structure of the gas storage reservoir of a semi-underground structure low-pressure gas storage reservoir system proposed by the present utility model.

[0021] In the figure: 1. Outer membrane; 2. Inner membrane; 3. Bottom membrane; 301. Bottom membrane protection cushion layer; 4. Gas charging and discharging pipeline system; 401. Gas charging and discharging pipeline valve; 402. Gas charging and discharging pipe network; 5. Pressure stabilizing control system; 501. Air supplement fan and pipeline; 502. Pressure stabilizing exhaust port; 503. Pressure stabilizing exhaust pipeline; 504. Exhaust port during energy release stage; 505. Sensor; 6. Entrance and exit passage; 7. Foundation part; 701. Semi-underground gas storage reservoir accumulation layer; 702. Gas storage space; 8. Bottom foundation of the gas storage reservoir; 801. Concrete structure around the gas storage reservoir; 802. Gas storage reservoir beam foundation inside the gas storage reservoir ground; 9. Cable net; 10. Sealing fixture; 1001. Fixed embedded part; 11. Sealing and fixing assembly; 1101. Sealing gasket; 1102. Sealing bolt. SPECIFIC EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] Please refer to Figures 1-3, the present utility model provides a technical solution: a semi-underground low-pressure gas storage system, which includes an outer membrane 1. An inner membrane 2 is arranged at the inner end of the outer membrane 1. An access passage 6 is arranged outside the outer membrane 1 and the inner membrane 2. A foundation part 7 is arranged below the outer membrane 1. The foundation part 7 includes a semi-underground gas storage accumulation layer 701 piled and cast around the foundation part 7. The foundation part 7 also includes a gas storage space 702 opened in the middle of the foundation part 7, and the bottom of the gas storage space 702 is designed as a plane;

[0024] In the middle of the foundation part 7 and located on the inner wall of the gas storage space 702, a gas storage bottom foundation 8 is cast. The gas storage bottom foundation 8 includes a gas storage ground inner gas storage beam foundation 802 cast above the semi-underground gas storage accumulation layer 701.

[0025] The gas storage space is composed of a space part above the ground and an underground space part. According to the span and length of the inner membrane 2, the gas storage space 702 is increased downward, which can extend the underground space below the ground, increase the relative height of the gas storage, and cast a gas storage bottom foundation 8 around the gas storage space 702 to fix and seal the outer membrane, inner membrane and bottom membrane, which can ensure the stability and safety of the underground gas storage space. According to the span and length of the inner membrane 2, the underground space is extended below the ground. By increasing the relative height of the gas storage 1, the capacity of the gas storage 1 is increased. Under the same gas storage capacity requirement, the floor area of the gas storage 1 can be greatly reduced, the land restriction can be reduced, and the land use cost can be reduced; Piling up the semi-underground gas storage accumulation layer 701 on the gas storage bottom foundation 8 can increase the height of the surrounding ground of the gas storage, form a surrounding layer of the semi-underground gas storage, reduce the underground space excavation work volume, further expand the capacity of the underground gas storage space, and reduce the transportation and unloading cost of earth and stone; At the same time, the inner membrane 2 is set as a spherical shape. After inflation, it is supported by the slightly positive pressure of the gas to form an arc shape. A protective layer space is formed between the inner and outer membranes, which is convenient for operation and maintenance; On the other hand, the spherical structure maximizes the internal space and can effectively store more gas. The structure of the inner membrane 2 is not limited to a hemispherical shape, and can also be an ellipsoidal shape, a polyhedral shape or other shapes in actual use.

[0026] Furthermore, a bottom membrane 3 is laid inside the gas storage space 702. A bottom membrane protection cushion layer 301 is laid between the bottom membrane 3, the gas storage bottom foundation 8 and the concrete structure 801 around the gas storage. A protection cushion layer is laid between the bottom membrane 3, the gas storage bottom foundation 8 and the concrete structure 801 around the gas storage, and the bottom membrane 3 is fixed on the concrete structure 801 around the gas storage, which can ensure the sealing performance, make the connection firm and reliable, and improve the uniform stress to extend the service life; In addition to the new excavation method on the ground for the underground gas storage space, the existing abandoned open-pit mine can also be used as the underground gas storage 1.

[0027] Furthermore, a gas charging and discharging pipeline system 4 is buried in the ground of the foundation part 7. The gas charging and discharging pipeline system 4 includes a gas charging and discharging pipeline valve 401 installed outside the gas charging and discharging pipeline system 4. The other end of the gas charging and discharging pipeline system 4 is connected to a gas charging and discharging pipe network 402, and the gas charging and discharging pipe network 402 is evenly laid on the bottom film 3. The gas charging and discharging pipeline valve 401 is remotely opened and closed according to the control of the energy storage system. CO2 is transported to the compressor unit through the gas charging and discharging pipeline system 4. In the expansion energy release stage, the CO2 output from the end of the expander is discharged into the gas storage reservoir through the gas charging and discharging pipeline system 4 to achieve the purpose of real-time feedback on the situation in the gas storage reservoir.

[0028] Furthermore, a pressure stabilizing control system 5 is fixedly installed on one side of the gas storage reservoir beam foundation 802 inside the ground of the gas storage reservoir. The pressure stabilizing control system 5 includes a gas supplementing fan and pipeline 501. The pressure stabilizing control system 5 includes a pressure stabilizing exhaust port 502 and a pressure stabilizing exhaust pipeline 503 installed on the other side of the gas storage reservoir beam foundation 802 inside the ground of the gas storage reservoir. The pressure stabilizing control system 5 includes an energy release stage exhaust port 504 arranged on the right side of the gas storage reservoir beam foundation 802 inside the ground of the gas storage reservoir. The pressure stabilizing control system 5 further includes a sensor 505 installed in the space of the outer film 1. The pressure stabilizing control system 5 detects relevant information such as the pressure and temperature inside the gas storage through the sensor 505, and automatically controls the fan unit, pipeline and exhaust port device to supplement gas and exhaust according to the operation condition and control strategy of the energy storage system to ensure the pressure stability inside the gas storage reservoir.

[0029] Furthermore, a steel cable net 9 is covered on the outer layer of the outer film 1. Sealing and fixing parts 10 are fixedly installed around the outer film 1 and the steel cable net 9. They are connected to the fixed embedded parts 1001 through the sealing and fixing parts 10 and fixed on the outside of the outer film 1, so that the outer film 1 can be protected by the steel cable net 9, thereby extending the service life of the outer film 1.

[0030] Furthermore, sealing and fixing components 11 are fixedly installed around the edges of the inner film 2. The sealing and fixing components 11 include sealing washers 1101 that are overlapped and connected up and down with the concrete structure 801 around the gas storage reservoir, which can increase the connection tightness, keep the force evenly distributed, and increase the firmness and reliability.

[0031] Furthermore, a plurality of groups of sealing bolts 1102 are threadedly connected through the middle of the sealing washer 1101. The outer film 1 and the concrete structure 801 around the gas storage reservoir are sealed and fixedly connected through the sealing and fixing components 11, which can increase the connection tightness, keep the force evenly distributed, and increase the firmness and reliability.

[0032] Working principle: For such a semi-underground structure low-pressure gas storage reservoir system, the gas storage reservoir space consists of the above-ground space part and the underground space part. The depth of the bottom space is determined according to the project requirements and geological conditions, and the underground gas storage space 702 is increased downward according to the span and length of the inner membrane 2, which can extend the underground space below the ground and increase the relative height of the gas storage reservoir. The bottom foundation 8 of the gas storage reservoir is poured around the gas storage space 702 to fix and seal the outer membrane, inner membrane, and bottom membrane, which can ensure the stability and safety of the underground gas storage space. The outer membrane 1 is sealed and fixed on the concrete structure 801 around the gas storage reservoir through the sealing and fixing components 11 at the edges according to the process requirements, with a distance for the maintenance passage spaced from the inner membrane 2. It is required to be sealed, firmly fixed, and evenly stressed, and waterproof treatment is carried out. A steel cable net 9 is covered on the outer layer of the outer membrane 1 for protection, and the steel cable net 9 is fixed on the concrete structure 801 around the gas storage reservoir through the sealing and fixing parts 10. The charging and discharging gas inlet and outlet pipes are buried in the ground of the gas storage reservoir, and the gas storage reservoir beam foundation 802 leads to the underground part of the gas storage reservoir, and the pipes are connected to the charging and discharging gas pipeline network 402; the charging and discharging gas pipeline network 402 is laid on the bottom membrane 3, and the charging and discharging gas process is made uniform through a reasonable pipeline layout design. All the entrance and exit channels 6 of the outer membrane 1 are opened to enable the air in the inner gas storage reservoir to be discharged in time, and at the same time, the support structures of the outer membrane 1 and the steel cable net 9 are ensured to be maintained.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A semi-underground structure low-pressure gas storage reservoir system, comprising an outer membrane (1), characterized in that: An inner membrane (2) is provided at the inner end of the outer membrane (1). An access passage (6) is provided on the outer sides of the outer membrane (1) and the inner membrane (2). A foundation part (7) is provided below the outer membrane (1). The foundation part (7) includes a semi-underground gas storage reservoir accumulation layer (701) piled and cast around the foundation part (7). The foundation part (7) further includes a gas storage space (702) opened in the middle of the foundation part (7), and the bottom of the gas storage space (702) is designed as a plane. In the middle of the foundation part (7) and located on the inner wall of the gas storage space (702), a gas storage reservoir bottom foundation (8) is cast. The gas storage reservoir bottom foundation (8) includes a gas storage reservoir beam foundation (802) inside the gas storage reservoir ground cast above the semi-underground gas storage reservoir accumulation layer (701).

2. The semi-underground structure low-pressure gas storage reservoir system according to claim 1, wherein: A bottom membrane (3) is laid inside the gas storage space (702). A bottom membrane protection cushion layer (301) is laid between the bottom membrane (3), the gas storage reservoir bottom foundation (8), and the concrete structure (801) around the gas storage reservoir.

3. The semi-underground structure low-pressure gas storage system according to claim 1, characterized in that: A gas charging and discharging pipeline system (4) is buried in the ground of the foundation part (7). The gas charging and discharging pipeline system (4) includes a gas charging and discharging pipeline valve (401) installed outside the gas charging and discharging pipeline system (4). The other end of the gas charging and discharging pipeline system (4) is connected to a gas charging and discharging pipe network (402), and the gas charging and discharging pipe network (402) is evenly laid on the bottom membrane (3).

4. A semi-underground structure low-pressure gas storage reservoir system according to claim 1, characterized in that: A pressure stabilizing control system (5) is fixedly installed on one side of the gas storage reservoir beam foundation (802) inside the gas storage reservoir ground. The pressure stabilizing control system (5) includes an air supplement fan and pipeline (501). The pressure stabilizing control system (5) includes a pressure stabilizing exhaust port (502) and a pressure stabilizing exhaust pipeline (503) installed on the other side of the gas storage reservoir beam foundation (802) inside the gas storage reservoir ground. The pressure stabilizing control system (5) includes an energy release stage exhaust port (504) arranged on the right side of the gas storage reservoir beam foundation (802) inside the gas storage reservoir ground. The pressure stabilizing control system (5) further includes a sensor (505) installed in the space of the outer membrane (1).

5. A semi-underground structure low-pressure gas storage reservoir system according to claim 1, characterized in that: A steel cable net (9) covers the outer layer of the outer membrane (1). The four sides of the steel cable net (9) are connected to a sealing and fixing member (10).

6. The semi-underground structure low-pressure gas storage reservoir system according to claim 1, wherein: Sealing and fixing members (10) are hermetically and fixedly installed around the edge of the outer membrane (1). The sealing and fixing members (10) include embedded parts (1001) provided on the concrete structure (801) around the gas storage reservoir.

7. A semi-underground structure low-pressure gas storage reservoir system according to claim 1, characterized in that: Sealing and fixing assemblies (11) are fixedly installed around the edge of the inner membrane (2). The sealing and fixing assemblies (11) include sealing washers (1101) overlapping and connecting with the concrete structure (801) around the gas storage reservoir up and down.

8. A semi-underground structure low-pressure gas storage reservoir system according to claim 7, characterized in that: A plurality of sets of sealing bolts (1102) are threadedly connected through the middle of the sealing washer (1101).

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