Underground water seal structure of underground high-pressure gas storage cave depot

Abstract

The utility model relates to an underground water seal structure of an underground high-pressure gas storage cave depot. The underground water seal structure comprises the gas storage cave depot, a water curtain system and a lining cave chamber. Wherein the gas storage cave depot is provided with at least one gas storage hole; the water curtain system is located below the underground water level line and comprises a horizontal water curtain and a vertical water curtain, the horizontal water curtain is arranged in the horizontal direction and located above the gas storage cave depot, the horizontal water curtain is communicated with the ground water injection system through a vertical shaft, the vertical water curtain is arranged in the vertical direction, and the vertical water curtain is communicated with the horizontal water curtain and surrounds the periphery of the gas storage cave depot; the lining cavern comprises a sealing layer, a lining and a surrounding rock, the sealing layer, the lining and the surrounding rock are sequentially laid on the outer side of the gas storage hole from inside to outside, and the sealing layer is a thin steel lining or a sealing coating. According to the underground water sealing structure of the underground high-pressure gas storage cave depot, the requirement for a cave chamber sealing material can be reduced, the temperature change of the cave depot is reduced, and the storage performance of the cave depot is improved.

Description

Technical Field

[0001] This application relates to the technical field of compressed air energy storage, and particularly relates to a groundwater sealing structure for an underground high-pressure gas storage cavern. Background Art

[0002] The gas storage device is an important component of a compressed air energy storage power station. Currently, underground caverns are used as compressed air storage reservoirs in engineering projects. The artificial lined cavern has flexible site selection, adapts to various geological conditions, and has a high matching degree with the wind and light resource areas in China, thus attracting particular attention in recent years. The artificial lined cavern follows the LRC concept of Sweden. Its main structure from the inside to the outside is successively the sealing layer, the lining, and the surrounding rock. Among them, the sealing layer is only used to prevent gas leakage, the lining is used to transfer the load to the surrounding rock, and finally the surrounding rock is relied on to bear the high pressure of the internal gas. However, at present, the overall design and construction technology of artificial high-pressure gas storage caverns are still immature, and there is still a lack of effective technical means for airtight protection. Utility Model Content

[0003] The embodiment of this application provides a groundwater sealing structure for an underground high-pressure gas storage cavern. This groundwater sealing structure for an underground high-pressure gas storage cavern can reduce the requirements for the sealing material of the cavern, reduce the temperature change of the cavern, and help improve the storage performance of the cavern.

[0004] The groundwater sealing structure for an underground high-pressure gas storage cavern provided by the embodiment of this application includes: a gas storage cavern, and the gas storage cavern has at least one gas storage cavern;

[0005] A water curtain system, the water curtain system is located below the groundwater level line. The water curtain system includes a horizontal water curtain and a vertical water curtain. The horizontal water curtain is arranged horizontally and is located above the gas storage cavern. The horizontal water curtain is connected to the ground water injection system through a shaft. The vertical water curtain is arranged vertically. The vertical water curtain is connected to the horizontal water curtain and surrounds the periphery of the gas storage cavern;

[0006] An artificial lined cavern, the artificial lined cavern includes a sealing layer, a lining, and surrounding rock. The sealing layer, the lining, and the surrounding rock are successively laid on the outside of the gas storage cavern from the inside to the outside. The sealing layer adopts a thin steel lining or a sealing coating.

[0007] In addition, the groundwater sealing structure for an underground high-pressure gas storage cavern provided by the embodiment of this application may also have the following additional technical features:

[0008] In an alternative solution, the horizontal water curtain includes a main roadway and a first water curtain channel. The number of main roadways is multiple, and the multiple main roadways are arranged horizontally in a crisscross pattern. The shaft is connected to at least one of the main roadways; the first water curtain channel is located between two adjacent main roadways. The number of first water curtain channels is multiple, and the multiple first water curtain channels are arranged at intervals and connect two adjacent main roadways.

[0009] In an alternative solution, the vertical water curtain includes a second water curtain channel, which communicates with the bottom of the main roadway and extends vertically for a preset depth. The number of the second water curtain channels is multiple, and the multiple second water curtain channels are arranged at intervals along the length direction of the main roadway.

[0010] In an alternative solution, at least one of the main roadway, the first water curtain channel, and the second water curtain channel is provided with monitoring equipment, which can detect temperature and water flow disturbance to monitor the gas escape position.

[0011] In an alternative solution, the cross-section of the main roadway is circular or horseshoe-shaped, and the main roadway can be passed through by pedestrians; the first water curtain channel is formed by drilling holes in the side wall of the main roadway.

[0012] In an alternative solution, the gas storage cavern is arranged in a planar circular tunnel type, at least part of the gas storage caverns are communicated with each other, and the gas storage caverns are connected to the ground system through a gas transmission pipeline via a vertical shaft.

[0013] In an alternative solution, when the gas storage cavern is in operation, the pressure in the water curtain system changes with the storage pressure of the gas in the gas storage cavern, and the pressure in the water curtain system is slightly higher than the storage pressure of the gas in the gas storage cavern.

[0014] The beneficial effects of the embodiments of the present application are as follows:

[0015] The underground high-pressure gas storage cavern groundwater seal structure of the present application adds a water curtain system on the basis of the lined cavern. The water pressure of the water curtain system can prevent the leakage of high-pressure gas in the gas storage cavern, reduce the requirements for the sealing material of the cavern. In addition, the water curtain around the cavern can also form a heat storage and heat exchange layer to reduce the temperature change of the cavern, which helps to improve the storage performance of the cavern.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic diagram of the underground high-pressure gas storage cavern groundwater seal structure provided by the present application;

[0018] Figure 2 It is a cross-sectional schematic diagram of the underground high-pressure gas storage cavern groundwater seal structure provided by the present application.

[0019] Reference numerals: gas storage cavern 1, gas storage cavern 11, water curtain system 2, horizontal water curtain 21, vertical water curtain 22, main roadway 211, first water curtain passage 212, second water curtain passage 221, groundwater level line 3, vertical shaft 4, surface water injection system 5, lined cavern 6.

[0020] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Detailed implementation manners

[0021] For a better understanding of the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0022] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0023] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0024] It should be understood that the term " / and" used herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally indicates that the associated objects before and after are in an "or" relationship.

[0025] It should be noted that the orientation terms such as "upper", "lower", "left" and "right" described in the embodiments of the present application are described from the angles shown in the accompanying drawings, and should not be construed as a limitation on the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0026] Such as Figure 1-2As shown in the figure, an embodiment of the present application provides a groundwater sealing structure for an underground high-pressure gas storage cavern. The groundwater sealing structure for the underground high-pressure gas storage cavern mainly includes a gas storage cavern 1, a water curtain system 2, and a lining cavern 6. Among them, the gas storage cavern 1 has at least one gas storage hole 11; the water curtain system 2 is located below the groundwater level line 3. The water curtain system 2 includes a horizontal water curtain 21 and a vertical water curtain 22. The horizontal water curtain 21 is arranged horizontally and is located above the gas storage cavern 1. The horizontal water curtain 21 is connected to the ground water injection system 5 through a shaft 4. The vertical water curtain 22 is arranged vertically. The vertical water curtain 22 is connected to the horizontal water curtain 21 and surrounds the circumference of the gas storage cavern 1; the lining cavern 6 includes a sealing layer, a lining, and surrounding rock. The sealing layer, the lining, and the surrounding rock are sequentially laid on the outside of the gas storage hole 11 from the inside to the outside. The sealing layer is made of a thin steel lining or a sealing coating. By arranging the water curtain system 2, the requirements for the sealing layer can be reduced.

[0027] In this embodiment, the groundwater sealing structure for the underground high-pressure gas storage cavern adds a water curtain system 2 on the basis of the lining cavern 6. The water pressure of the water curtain system 2 can prevent the leakage of high-pressure gas in the gas storage cavern 1 and can reduce the requirements for the chamber sealing material. In addition, the water curtain around the cavern can also form a heat storage and heat exchange layer, reducing the temperature change of the cavern and helping to improve the storage performance of the cavern.

[0028] As Figure 1-2 shown, in a specific embodiment, the horizontal water curtain 21 includes a main roadway 211 and a first water curtain channel 212. The number of main roadways 211 is multiple. The multiple main roadways 211 are arranged horizontally in a crisscross pattern. The shaft 4 is connected to at least one main roadway 211; the first water curtain channel 212 is located between two adjacent main roadways 211. The number of first water curtain channels 212 is multiple. The multiple first water curtain channels 212 are arranged at intervals and connect two adjacent main roadways 211.

[0029] As Figure 1-2 shown, in a specific embodiment, the vertical water curtain 22 includes a second water curtain channel 221. The second water curtain channel 221 is connected to the bottom of the main roadway 211 and extends a preset depth in the vertical direction. The number of second water curtain channels 221 is multiple. The multiple second water curtain channels 221 are arranged at intervals along the length direction of the main roadway 211.

[0030] It should be noted that the gas storage cavern 1 of the groundwater sealing structure for the underground high-pressure gas storage cavern can not only store compressed air, but also be used to store carbon dioxide, hydrogen, helium, etc., which will not be elaborated here. In addition, the length of the second water curtain channel 221 can cover the height of the gas storage cavern 1, and the distance between the two farthest main roadways 211 can cover the distance between the gas storage holes 11 of the gas storage cavern 1.

[0031] In a specific embodiment, at least one of the main roadway 211, the first water curtain passage 212, and the second water curtain passage 221 is provided with monitoring equipment. The monitoring equipment is sensitive to temperature and water flow disturbance, so as to be able to detect temperature and water flow disturbance and timely judge and feedback the gas escape position. By capturing the movement and stillness of gas leakage with water, the problem of gas leakage monitoring is solved, and the gas can also be collected and evacuated along with the leakage gas through the water curtain, reducing the leakage damage. In addition, the cross-section of the main roadway 211 is circular or horseshoe-shaped, and the main roadway 211 can be passed through by pedestrians; the first water curtain passage 212 is formed by drilling holes in the side wall of the main roadway 211.

[0032] As Figure 1-2 shown, in a specific embodiment, the gas storage cavern 1 is arranged in a planar circular tunnel type, at least some of the gas storage caverns 11 in the gas storage cavern 1 are connected, and the gas storage cavern 11 is connected to the ground system through a gas transmission pipeline passing through a vertical shaft 4. When the gas storage cavern 1 is in operation, the pressure in the water curtain system 2 changes with the storage pressure of the gas in the gas storage cavern 11, and the pressure in the water curtain system 2 is slightly higher than the storage pressure of the gas in the gas storage cavern 11. Through the balance between water pressure and air pressure, the leakage of the stored gas can be prevented, the performance requirements for the sealing layer of the cavern can be reduced, and related costs can be reduced. At the same time, the water curtain system 2 can also form a heat storage and heat exchange layer around the cavern wall, which helps to reduce the temperature fluctuation caused by the injection and production operation of the cavern and improve the storage performance.

[0033] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An underground high-pressure gas storage cavern groundwater sealing structure, characterized in that, Comprising: A gas storage cavern, the gas storage cavern having at least one gas storage cavity; A water curtain system, the water curtain system being located below the groundwater level line, the water curtain system including a horizontal water curtain and a vertical water curtain, the horizontal water curtain being arranged horizontally and located above the gas storage cavern, the horizontal water curtain being communicated with a ground water injection system through a shaft, the vertical water curtain being arranged vertically, the vertical water curtain being communicated with the horizontal water curtain and surrounding the circumference of the gas storage cavern; A lined cavern, the lined cavern including a sealing layer, a lining and surrounding rock, the sealing layer, the lining and the surrounding rock being sequentially laid on the outer side of the gas storage cavity from inside to outside, the sealing layer being made of a thin steel lining or a sealing coating.

2. The groundwater sealing structure of the underground high-pressure gas storage cavern according to claim 1, wherein The horizontal water curtain includes a main roadway and a first water curtain passage, the number of the main roadways being multiple, the multiple main roadways being arranged horizontally in a crisscross pattern, the shaft being communicated with at least one of the main roadways; the first water curtain passage is located between two adjacent main roadways, the number of the first water curtain passages being multiple, the multiple first water curtain passages being arranged at intervals and communicating two adjacent main roadways.

3. The groundwater-sealed structure of the underground high-pressure gas storage cavern according to claim 2, wherein The vertical water curtain includes a second water curtain passage, the second water curtain passage being communicated with the bottom of the main roadway and extending a preset depth in the vertical direction, the number of the second water curtain passages being multiple, the multiple second water curtain passages being arranged at intervals along the length direction of the main roadway.

4. The groundwater-sealed structure of the underground high-pressure gas storage cavern according to claim 3, characterized in that, At least one of the main roadway, the first water curtain passage and the second water curtain passage is provided with monitoring equipment, the monitoring equipment being capable of detecting temperature and water flow disturbance to monitor the gas escape position.

5. The groundwater-sealed structure of the underground high-pressure gas storage cavern according to any one of claims 2-4, characterized in that, The cross section of the main roadway is circular or horseshoe-shaped, the main roadway being passable by pedestrians; the first water curtain passage is formed by drilling holes in the side wall of the main roadway.

6. The groundwater-sealed structure of the underground high-pressure gas storage cavern according to claim 5, characterized in that, The gas storage cavern is arranged in a planar circular tunnel type, at least part of the gas storage cavities in the gas storage cavern being communicated, the gas storage cavity being connected to the ground system through a gas transmission pipeline via a shaft.

7. The underground high-pressure gas storage cavern groundwater seal structure according to any one of claims 1-4 or claim 6, characterized in that, When the gas storage cavern is in operation, the pressure in the water curtain system changes with the storage pressure of the gas in the gas storage cavity, and the pressure in the water curtain system is slightly higher than the storage pressure of the gas in the gas storage cavity.

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