Underground gas storage

Abstract

The invention provides an underground gas storage and relates to the technical field of underground gas storage. The underground gas storage comprises a gas storage chamber arranged underground and used for an energy storage system, and further comprises an inflation and deflation pipeline capable of inflating and deflating the gas storage chamber. A maintenance pipe section detachably connected with the inflation and deflation pipeline is arranged on the inflation and deflation pipeline close to the gas storage chamber, and after the maintenance pipe section is detached from the inflation and deflation pipeline, a channel for people to enter and exit the gas storage chamber is formed in the inflation and deflation pipeline. The underground gas storage chamber solves the problems that when an existing underground gas storage chamber needs to be overhauled, a maintainer carries a tool to go in and out of the gas storage chamber difficultly, and safety is poor, and the underground gas storage chamber is suitable for an underground gas storage of a compressed air energy storage system needing regular maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground gas storage, in particular to an underground gas storage. BACKGROUND

[0002] The underground gas storage has strong site adaptability, is the most promising gas storage mode in the future, and is a core element of planning and design of large compressed air energy storage power station. The underground gas storage directly affects the construction investment and site selection decision of the power station, and will determine the efficiency and stability of the future operation of the power station.

[0003] The gas storage area for storing compressed air in the underground gas storage is called a gas storage chamber. Since the gas storage chamber of the compressed air energy storage system is frequently inflated and deflated, the gas storage chamber bears alternating high pressure load, which puts higher requirements on the sealing performance of the gas storage chamber. During operation, the compressed air energy storage power station needs to be regularly maintained by personnel to ensure that the gas storage chamber is always in an efficient operation state. One of the work contents of the maintenance personnel when performing maintenance is to accurately locate and repair the leakage points of the sealing layer in the gas storage chamber. In the process of realizing the present application, the inventors found that at least the following problems exist in the prior art: when the maintenance personnel carrying tools enter the underground gas storage chamber, there are problems of difficulty in entering and exiting the gas storage chamber and poor safety. SUMMARY

[0004] The purpose of the present application is to provide an underground gas storage in which personnel can safely and quickly enter the gas storage chamber.

[0005] To achieve this purpose, on the one hand, an underground gas storage is provided, which comprises a gas storage chamber for an energy storage system arranged underground, and further comprises a gas charging and discharging pipeline capable of charging and discharging the gas storage chamber; a maintenance pipeline section is arranged on the gas charging and discharging pipeline close to the gas storage chamber and is detachably connected with the gas charging and discharging pipeline. After the maintenance pipeline section is detached from the gas charging and discharging pipeline, a passage is formed on the gas charging and discharging pipeline for personnel to enter and exit the gas storage chamber.

[0006] Further, the pipe diameter at the position where the maintenance pipeline section is arranged on the gas charging and discharging pipeline is maximum.

[0007] Further, a vertical shaft communicating with the ground is further included, one end of the vertical shaft communicates with the ground, and the other end of the vertical shaft communicates with a tunnel located underground, the gas storage chamber can be reached through the tunnel, and the gas charging and discharging pipeline penetrates through the vertical shaft and the tunnel.

[0008] Further, a vertical shaft bottom platform is arranged in the vertical shaft close to the tunnel, and the gas charging and discharging pipeline is fixed in the vertical shaft bottom platform.

[0009] Further, a maintenance corridor is arranged in the tunnel for equipment and personnel to pass through, and the maintenance corridor is constructed in the tunnel by a plugging body. Further, a maintenance corridor is arranged in the tunnel for equipment and personnel to pass through, and the maintenance corridor is constructed in the tunnel by a plugging body.

[0010] Furthermore, the section connecting the gas filling / discharging pipeline to the gas storage chamber is located within the sealing body.

[0011] Furthermore, a pit for placing the maintenance pipe section is provided at the bottom of the maintenance corridor located below the maintenance pipe section.

[0012] Furthermore, a hoisting mechanism for hoisting the maintenance pipe section is provided at the top of the maintenance corridor above the maintenance pipe section.

[0013] Furthermore, at least one pipe support is provided in the maintenance corridor to support the inflation / deflation pipe.

[0014] Furthermore, a passageway is opened inside the bottom platform of the shaft, which runs through the top and bottom surfaces of the bottom platform to allow personnel and equipment to enter and exit the roadway.

[0015] One of the above technical solutions has the following advantages or beneficial effects: In this underground gas storage facility, the filling and discharging pipelines are equipped with detachable maintenance sections. After removing these maintenance sections, a passageway is created on the filling and discharging pipeline for personnel to enter and exit the gas storage chamber. When maintenance is required, personnel first enter the tunnel from the shaft, remove the maintenance section at the location of the gas storage chamber, and then enter. After maintenance, the maintenance section is reconnected to the filling and discharging pipeline via the detachable connection structure. Therefore, this underground gas storage facility allows maintenance personnel to safely and quickly access the gas storage chamber, making it particularly suitable for gas storage chambers used in energy storage systems that require periodic maintenance. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the underground gas storage facility in the embodiment; Figure 2 This is a cross-sectional view of the underground gas storage facility in an embodiment.

[0017] In the diagram: 1-Vertical shaft; 2-Gas filling / draining pipeline; 21-Main gas filling / draining pipeline; 22-First section of gas filling / draining branch pipeline; 23-Second section of gas filling / draining branch pipeline; 231-Maintenance section; 24-Intermediate section of gas filling / draining branch pipeline; 241-Reducing pipe; 242-Horizontal section; 243-Bend section; 31-Elevator; 32-Emergency evacuation ladder; 4-Gas storage chamber; 5-Bottom platform of vertical shaft; 6-Ladder; 7-Tunnel; 8-Maintenance corridor; 81-Pit; 82-Lifting hole; 9-Sealing body; 10-Lifting mechanism; 11-Pipe support. Detailed Implementation

[0018] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] like Figures 1-2 As shown, underground gas storage facilities include gas storage chambers. Existing large-scale compressed air energy storage systems are built underground, and these chambers are characterized by large capacity, large volume, and high gas pressure. Because vibrations occur during the filling and discharging of gas, gas storage chambers are often located in areas with hard rock to improve their stability. This increases the burial depth of the gas storage chambers and also increases the difficulty for maintenance personnel to enter and exit them.

[0020] This embodiment provides an underground gas storage facility that allows personnel to safely and quickly enter the gas storage chamber 4. The gas storage chamber can be any existing shape, including large tank type, tunnel type, spherical type or annular type gas storage chamber.

[0021] The underground gas storage facility also includes a gas filling and discharging pipeline 2. One end of the pipeline 2 is connected to the gas-using equipment (such as compressors and expanders) in the above-ground plant, and the other end is connected to the underground gas storage chamber 4. The underground gas storage facility also includes a vertical shaft 1 connecting the above-ground and underground gas storage chamber 4. The gas filling and discharging pipeline is located inside the vertical shaft 1 and is connected to the gas storage chamber via the shaft. The pipeline is fixed to the shaft wall inside the vertical shaft 1 by using anchor bolts as supports.

[0022] Optionally, the vertical shaft 1 of the underground gas storage facility can be a vertical shaft whose length direction is approximately perpendicular to the bottom surface, or it can be an inclined shaft whose length direction is at a certain angle to the bottom surface. For example... Figures 1-2 When shaft 1 is a vertical shaft, an industrial elevator 31 is installed inside shaft 1 to facilitate personnel access to the underground area. When shaft 1 is an inclined shaft, a driveway is provided inside shaft 1 to facilitate vehicle access.

[0023] like Figures 1-2 As shown, the underground gas storage facility also has a tunnel 7 that leads from the vertical shaft 1 to the gas storage chamber 4. The tunnel 7 is connected to the vertical shaft 1 and is located in the underground area of ​​the underground gas storage facility.

[0024] Currently, in order to increase the gas storage capacity while ensuring the gas storage pressure, there is more than one set of gas storage chambers 4 in the underground gas storage. When there are multiple sets of gas storage chambers 4 in the underground gas storage, the filling and discharging pipelines of two or more gas storage chambers can share a vertical shaft 1. Figure 1This illustrates an implementation where two sets of gas storage chambers 4 within an underground gas storage facility share a single vertical shaft 1. For example... Figure 1 Two or more gas storage chambers 4 can share a single main gas filling / draining pipeline 21. This main pipeline 21 is located inside the shaft 1 and is fixed to the shaft wall using anchor bolts. The other end of the main pipeline 21 branches into multiple branch pipelines, each connecting to a group of gas storage chambers 4. The branch pipes connecting the main pipeline 21 and the branch pipelines can be located either inside the shaft 1 or within a roadway. Figure 1 The gas filling and discharging branch pipe connected to the gas storage chamber 4 is connected to the gas storage chamber 4 through the roadway 7.

[0025] like Figures 1-2 As shown, to improve the stability of the underground portion of the underground gas storage facility, a bottom platform 5 is installed near tunnel 7 within shaft 1. The bottom platform 5 is a reinforced concrete structure, and the gas filling and discharging pipeline is fixed within it. The upper surface of the bottom platform 5 faces the entrance of shaft 1, the side of the bottom platform is fixedly connected to shaft 1, and the lower surface of the bottom platform 5 faces away from the entrance of shaft 1. Optionally, the lower surface of the bottom platform is located at the connection point between shaft 1 and tunnel 7. The height of the bottom platform 5 is determined through strength calculations. The bottom platform 5 improves the connection stability between the junction of shaft 1 and tunnel 7 and provides external support for the gas filling and discharging pipeline, preventing significant displacement during gas filling and discharging operations.

[0026] like Figures 1-2 As shown, when the inflation / deflation pipeline includes a main inflation / deflation pipeline 21 and inflation / deflation branch pipelines, the branch pipe connecting the main inflation / deflation pipeline 21 and the inflation / deflation branch pipelines is located in the vertical shaft 1 above the bottom platform, making the main inflation / deflation pipeline 21 and the inflation / deflation branch pipelines more stable. Of course, the branch pipe can also be fixed inside the bottom platform.

[0027] like Figures 1-2 As shown, after the gas charging / discharging branch pipe is connected to the gas storage chamber 4, it is fixed in the roadway 7 by a sealing body 9. Optionally, sealing bodies are evenly distributed throughout the roadway, and a maintenance corridor 8 for equipment personnel to pass through is set inside the sealing body. The maintenance corridor 8 is fixed to the roadway 7 by the sealing body 9, that is, sealing bodies are set on the outside of the maintenance corridor and inside the roadway. Optionally, the sealing body is a reinforced concrete structure. A section of the gas charging / discharging branch pipe connected to the gas storage chamber 4 is located inside the sealing body 9, and the remaining gas charging / discharging branch pipe is exposed in the maintenance corridor 8. Optionally, there is space for personnel to pass through between one side of the gas charging / discharging branch pipe and the side wall of the maintenance corridor 8. Optionally, there is at least 0.6 meters to 1 meter of space between the maintenance corridor 8 and one side of the gas charging / discharging branch pipe.

[0028] like Figures 1-2The gas filling and discharging branch pipe includes a first gas filling and discharging branch pipe 22 connected to the main gas filling and discharging branch pipe 21, a second gas filling and discharging branch pipe 23 connected to the gas storage chamber 4, and an intermediate gas filling and discharging branch pipe 24 connecting the first and second sections. The second gas filling and discharging branch pipe 23 is used for both gas filling and discharging and personnel access to the gas storage chamber 4; therefore, the diameter of the second gas filling and discharging branch pipe 23 is larger than that of the first gas filling and discharging branch pipe 22 connected to the main gas filling and discharging branch pipe 21. The intermediate gas filling and discharging branch pipe 24 has a reducing pipe 241. One end of the reducing pipe 241 has the same diameter as the second gas filling and discharging branch pipe 23 and is connected to it. The other end of the reducing pipe 241 has the same diameter as the first gas filling and discharging branch pipe 22 and is connected to it. The reducing pipe 241 is used to smoothly connect the two ends of the gas filling and discharging branch pipes with different diameters. Inside the tunnel 7, the junction of the sealing body 9 and the maintenance corridor 8 is on the second section of the gas filling and discharging branch pipe 23 with a larger diameter. That is to say, the second section of the gas filling and discharging branch pipe 23 is partially fixed inside the sealing body 9 and partially exposed to the maintenance corridor 8.

[0029] In this embodiment, the underground gas storage facility has a maintenance pipe section 231 detachably connected to the second section of the gas filling / discharging branch pipe 23 exposed in the maintenance corridor 8. After the maintenance pipe section 231 is removed from the gas filling / discharging pipe, a passage for personnel to enter and exit the gas storage chamber is formed on the gas filling / discharging pipe. After the maintenance pipe section 231 is removed, personnel can easily enter the gas storage chamber 4 with equipment. Optionally, the length of the maintenance pipe section 231 is a smaller value that meets the strength requirements.

[0030] One structure for the detachable connection between the maintenance pipe section 231 and the gas charging / discharging branch pipe is a flange connection. First flanges are installed at both ends of the maintenance pipe section 231, and second flanges are installed on the gas charging / discharging branch pipes connected to the first flanges at both ends of the maintenance pipe section 231. The first and second flanges are connected by bolts. Optionally, a seal is provided at the connection between the first and second flanges.

[0031] Furthermore, a recess 81 is provided at the bottom of the maintenance corridor 8 below the maintenance pipe section 231 to accommodate the maintenance pipe section 231, allowing the maintenance pipe section to be staggered from the charging / discharging pipeline connected to the gas storage chamber. After the maintenance pipe section 231 is removed from the charging / discharging branch pipeline, it can be placed in the recess 81 of the maintenance corridor 8, creating a passageway between the maintenance pipe section 231 and the charging / discharging branch pipeline that facilitates quick and safe access for personnel to the gas storage chamber 4. Optionally, the width of the recess 81 is greater than the width of the maintenance pipe section 231, allowing the maintenance pipe section 231 to be laid flat within the recess 81.

[0032] Furthermore, a hoisting mechanism 10 for hoisting the maintenance pipe section 231 is provided at the top of the maintenance corridor 8 above the maintenance pipe section 231. When disassembling the maintenance pipe section 231, the hoisting mechanism 10 can be used to hoist the maintenance pipe section 231. After the maintenance pipe section 231 is released from the gas filling / deleting branch pipe, the maintenance pipe section 231 is laid flat by the hoisting mechanism 10, or the maintenance pipe section 231 is placed into the pit 81 to ensure operational safety. The hoisting mechanism 10 can be an existing small lifting equipment such as an electric hoist or a hand-operated hoist. Optionally, a hoisting hole 82 for installing the hoisting mechanism 10 is provided at the top of the maintenance corridor 8 to meet the layout and working space requirements of the hoisting mechanism 10.

[0033] As described above, the gas filling and discharging branch pipeline includes a first section 22 connected to the main gas filling and discharging pipeline 21, a second section 23 connected to the gas storage chamber 4, and an intermediate section 24 connecting the first and second sections. The maintenance pipe section 231 is located on the first section 22, and the intermediate section 24 has a reducing pipe 241. For example... Figure 2 As shown, optionally, the reducer 241 on the intermediate gas charging / discharging branch pipe 24 is arranged near the maintenance section 231 of the second gas charging / discharging branch pipe 23. The reducer 241 is connected to the side of the maintenance section 231 away from the gas storage chamber 4. The end of the reducer 241 with a larger diameter is connected to the second gas charging / discharging branch pipe 23, and the end of the reducer 241 with a smaller diameter is connected to the first gas charging / discharging branch pipe 22.

[0034] like Figures 1-2 Optionally, the intermediate gas charging / discharging branch pipe 24 extends from the reducer pipe 241 towards the shaft 1. Besides the reducer pipe 241, the intermediate gas charging / discharging branch pipe 24 also includes a horizontal section 242 located in the maintenance corridor 8 and a bent section 243 leading to the shaft 1. One end of the reducer pipe is connected to the second gas charging / discharging branch pipe 23, and the other end is connected to the horizontal section 242 of the intermediate gas charging / discharging branch pipe 24. The other end of the horizontal section 242 is connected to the bent section 243, and the other end of the bent section 243 is connected to the first gas charging / discharging branch pipe 22. Optionally, when there is a shaft bottom platform 5 inside the shaft 1, the bent section is fixed inside the shaft bottom platform 5. One end of the first gas charging / discharging branch pipe 22 is connected to the bent section of the intermediate gas charging / discharging branch pipe 24, and the other end is connected to the main gas charging / discharging pipe 21.

[0035] like Figures 1-2 Optionally, at least one pipe support 11 is provided in the maintenance corridor 8 to support the gas charging / discharging branch pipe. The horizontal section of the intermediate gas charging / discharging branch pipe 24 located in the maintenance corridor 8 is supported by the pipe support 11 to improve the stability of the gas charging / discharging pipe. When there is only one set of underground gas storage chambers, the pipe support 11 is used to support the gas charging / discharging pipe located in the maintenance corridor 8.

[0036] As described above, an industrial elevator 31 is installed in the shaft 1 to facilitate personnel access to the underground area. This industrial elevator 31 can directly reach the ground of the maintenance corridor located in the tunnel 7. At this time, a shaft for the elevator 31 is provided in the bottom platform 5 of the shaft. Since the construction conditions of the industrial elevator 31 shaft may compromise the strength of the bottom platform 5, a passage for installing a ladder for entering and exiting the tunnel is opened at the center of the bottom platform 5 to ensure its strength. The passage of the bottom platform 5 leads to the maintenance corridor 8, and the passage runs through the top and bottom surfaces of the bottom platform 5. A ladder 6 or a simple elevator 31 for personnel to ascend and descend is installed in the passage of the bottom platform, and the ladder 6 or simple elevator 31 extends to the ground of the maintenance corridor 8. Figures 1-2 The passageway is equipped with ladders 6 for personnel to ascend and descend. Ladders 6 are simple in structure, safe, reliable, and easy to maintain, reducing the risk of personnel being trapped underground due to damage to the elevator equipment. Furthermore, an emergency evacuation ladder 32 is installed behind the industrial elevator 31 to facilitate the evacuation of maintenance personnel in emergencies.

[0037] Because the maintenance work is carried out during the period when gas storage in the gas storage chamber is suspended, the remaining compressed air in the chamber must be purged before maintenance. In most existing gas storage chambers, maintenance personnel enter directly through the inlet and outlet pipes after purging. Since the gas storage chambers are far from the ground, the process of entering through the long and narrow inlet and outlet pipes presents problems such as limited space and significant safety hazards. Therefore, existing gas storage chambers suffer from difficulties in personnel access during maintenance, resulting in challenging work, long operation times, and significant safety risks.

[0038] In this embodiment of the underground gas storage facility, a maintenance section is detachably connected to the gas filling and discharging pipeline within the tunnel. After removing the maintenance section from the gas filling and discharging pipeline, a passageway is formed on the pipeline for personnel to enter and exit the gas storage chamber. When maintenance of the gas storage chamber is required, maintenance personnel use an industrial elevator to reach the bottom of the shaft, then access the flange-removable section of the gas filling and discharging pipeline via a maintenance corridor. After the flange is removed, a short section of the maintenance pipeline is hoisted into a pre-designed pit using a lifting mechanism such as an electric hoist. Maintenance personnel can then access the interior of the gas storage chamber via the maintenance pipeline to carry out maintenance work on the internal structure, such as the steel lining sealing layer. Therefore, in this underground gas storage facility, the space within the shaft and tunnels is relatively large, allowing for the installation of machinery such as industrial elevators, which reduces the difficulty for maintenance personnel to enter the gas storage chamber. Therefore, with this underground gas storage system, maintenance personnel can safely and quickly perform maintenance work on the steel lining sealing layer without having to go through the entire filling and discharging pipeline or disassemble a large amount of the filling and discharging pipeline. It is especially suitable for maintenance of the gas storage chamber during the operation of the compressed air energy storage power station, such as inspecting and repairing the sealing layer structure inside the gas storage chamber.

[0039] Specifically, as shown in the figure -Figure 2 In this embodiment, the underground gas storage facility allows personnel to enter the gas storage chamber as follows: personnel enter the shaft 1 from the ground above the shaft 1 via an industrial elevator 31 and reach the top of the shaft bottom platform 5. Upon arrival, they can use the ladder 6 within the passageway of the shaft bottom platform 5 to reach the maintenance corridor 8 located in the tunnel 7. After passing through the maintenance corridor 8, they reach the maintenance pipe section 231. Once at the maintenance pipe section 231, the flanges on both sides of the maintenance pipe section 231 are lifted and disassembled using the hoisting mechanism 10, detaching the maintenance pipe section 231 from the second gas filling / discharging branch pipe 23. The maintenance pipe section 231 is then placed in the pit 81. At this point, an opening is offset on the second gas filling / discharging branch pipe 23, allowing personnel to enter. Personnel carrying equipment enter the gas storage chamber 4 through this opening to perform maintenance on the interior of the gas storage chamber 4.

[0040] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An underground gas storage facility, characterized in that, It includes an underground gas storage chamber for energy storage system, and a gas filling and emptying pipeline for filling and emptying the gas storage chamber; a maintenance pipe section is provided on the gas filling and emptying pipeline near the gas storage chamber, and after the maintenance pipe section is removed from the gas filling and emptying pipeline, a passage for personnel to enter and exit the gas storage chamber is formed on the gas filling and emptying pipeline.

2. The underground gas storage facility according to claim 1, characterized in that, The pipe diameter is largest at the location where the maintenance section is set on the inflation / deflation pipeline.

3. The underground gas storage facility according to claim 1, characterized in that, It also includes a vertical shaft connected to the ground, the other end of which is connected to an underground tunnel, through which a gas storage chamber can be reached, and the gas filling and discharging pipe runs through the vertical shaft and the tunnel.

4. The underground gas storage facility according to claim 3, characterized in that, A bottom platform is located near the tunnel inside the shaft, and the inflation / deflation pipes are fixed inside the bottom platform.

5. The underground gas storage facility according to claim 3, characterized in that, The tunnel is equipped with a maintenance corridor for equipment and personnel to pass through. The maintenance corridor is constructed within the tunnel through a sealing structure.

6. The underground gas storage facility according to claim 5, characterized in that, The section connecting the inflation / deflation pipeline to the gas storage chamber is located within the sealing body.

7. The underground gas storage facility according to claim 5, characterized in that, At the bottom of the maintenance corridor located below the maintenance pipe section, there is a pit for placing the maintenance pipe section.

8. The underground gas storage facility according to claim 5, characterized in that, A hoisting mechanism for hoisting the maintenance pipe section is installed at the top of the maintenance corridor above the maintenance pipe section.

9. The underground gas storage facility according to claim 5, characterized in that, At least one pipe support is provided in the maintenance corridor to support the inflation / deflation pipe.

10. The underground gas storage facility according to claim 3, characterized in that, A passageway is opened inside the bottom platform of the shaft, which runs through the top and bottom surfaces of the bottom platform to allow personnel and equipment to enter and exit the tunnel.

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