Drainage structure of underground gas storage and compressed air energy storage power station

Abstract

The invention discloses a drainage structure of an underground gas storage and a compressed air energy storage power station, and relates to the technical field of underground gas storage, the drainage structure is arranged on the outer wall of a lining of a gas storage cavity, the drainage structure comprises a horizontal water collecting channel arranged on the outer wall of the lining, and a first water collecting opening is formed in the horizontal water collecting channel; water flows into the horizontal water collecting channel from the first water collecting opening; the annular water collecting channel and the horizontal water collecting channel are arranged in a crossed manner and are communicated with each other; a water diversion pipe system is arranged at the bottom of the annular water collection channel, and the other end of the water diversion pipe system discharges water through a water pumping device. The underground gas storage lining solves the problems that the external water pressure of an existing underground gas storage lining is large, and a metal lining is prone to corrosion, underground seepage water can be discharged in time, and the technical effect of long-time safe, continuous and stable operation is achieved. The underground gas storage with the drainage structure can operate safely, continuously and stably for a long time, so that the compressed air energy storage power station can realize large-scale and long-time energy storage.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a drainage structure of an underground gas storage reservoir and a compressed air energy storage power station. Background Art

[0002] Compressed gas energy storage is a new energy storage technology. During periods of low grid load, electricity is used to compress the gas used as the power generation medium. During peak grid load periods, the compressed air is released to drive steam turbines for power generation. Existing mainstream compressed gas energy storage technologies include compressed air energy storage, carbon dioxide energy storage, and liquid air energy storage. One of the key technologies of compressed gas energy storage is gas storage.

[0003] Underground gas storage (UGS) is a type of gas storage technology. For example, in compressed air energy storage power plants, underground gas storage is typically constructed in areas with abundant hard rock. To ensure airtightness and adaptability to frequent filling and deflation, UGS typically utilizes a liner. Concrete is placed between the outer wall of the liner and the hard rock, and the gas storage space is located within the liner.

[0004] However, in areas rich in hard rock, where groundwater is abundant, frequent inflation and deflation of underground gas storage facilities can easily cause the outer wall of the lining to separate from the concrete layer. This cyclic pressure causes cracks in the concrete layer, allowing groundwater to pool through these cracks on the outer surface of the lining. If not promptly drained, this can create significant external water pressure on the lining. If the lining is made of metal, this accumulation of groundwater can also cause corrosion, compromising the overall safety and stability of the gas storage facility. Summary of the Invention

[0005] The purpose of the present invention is to provide a drainage structure of an underground gas storage reservoir that can promptly discharge underground seepage water, and an underground gas storage reservoir and a compressed air energy storage power station that can operate continuously and stably for a long time.

[0006] To achieve this purpose, on the one hand, a drainage structure of an underground gas storage reservoir is provided, which is arranged on the outer wall of the lining of the gas storage chamber; the drainage structure includes a horizontal water collection channel arranged on the outer wall of the lining, and the horizontal water collection channel has a first water collection port, and water flows into the horizontal water collection channel from the first water collection port; an annular water collection channel is arranged to cross the horizontal water collection channel and is interconnected, so that the water in the horizontal water collection channel can flow into the annular water collection channel; a water diversion pipe system is provided at the bottom of the annular water collection channel, one end of the water diversion pipe system is connected to the annular water collection channel, and the other end of the water diversion pipe system leads to the water collection pit of the underground gas storage reservoir.

[0007] Furthermore, the annular water collection channel includes a water collection area and a water collection area provided with a second water collection port, the water collection area is connected end to end with the water collection area, the water collection area is located at the upper part of the lining, the water collection area is located at the lower part of the lining, and the water collection area has a second water collection port.

[0008] Furthermore, the water diversion pipe system includes at least one vertical water diversion pipe, and each of the vertical water diversion pipes is connected to the lowest point of the annular water collection channel.

[0009] Furthermore, the water diversion pipe system also includes a longitudinal water diversion pipe, which is connected to all the vertical water diversion pipes and introduces water into the sump of the underground gas storage reservoir.

[0010] Furthermore, the horizontal water collection channel and the outer wall of the liner are welded by using a jump welding method, and two adjacent welding points form the first water collection port.

[0011] Furthermore, the annular water collection channel and the outer wall of the lining are welded by full welding.

[0012] Furthermore, the water collection area and the inner lining are welded by using a jump welding method, and the water collection area and the inner lining are welded by using a full welding method.

[0013] Furthermore, the horizontal water collection channel is made of angle steel.

[0014] Furthermore, the annular water collection channel is made of channel steel.

[0015] On the other hand, a compressed air energy storage power station is also provided, including an underground gas storage reservoir, wherein the underground gas storage reservoir includes the drainage structure of the underground gas storage reservoir described above.

[0016] One of the above technical solutions has the following advantages or beneficial effects: the drainage structure of the underground gas storage reservoir includes a horizontal water collection channel, and the horizontal water collection channel has a first water collection port. When there is underground water seepage on the outer wall of the inner lining, the underground water seepage flows into the horizontal water collection channel from the first water collection port. The drainage structure also includes an annular water collection channel that is arranged crosswise with the horizontal water collection channel and interconnected. The underground water seepage in the horizontal water collection channel flows into the annular water collection channel under the action of gravity. A water diversion pipe system is provided at the bottom of the annular water collection channel, which leads the underground water seepage in the annular water collection channel to a specific collection point. The above collection point can be a sump of the underground gas storage reservoir.

[0017] The drainage structure arranged on the outer wall of the lining of the underground gas storage reservoir is used to timely divert the groundwater around the outer wall of the lining of the gas storage reservoir and discharge it at a fixed point, so that there is no groundwater accumulation around the lining of the gas storage reservoir, which will not affect the lining of the gas storage reservoir, thereby ensuring that the underground gas storage reservoir can operate safely, continuously and stably for a long time.

[0018] The compressed air energy storage power station of this scheme, because its underground gas storage is provided with the above-mentioned drainage structure, the underground gas storage can operate safely, continuously and stably for a long time, and the compressed air energy storage power station can achieve large-scale and long-term energy storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the drainage structure on the air storage chamber;

[0020] Figure 2 It is a front view of the drainage structure on the air storage chamber;

[0021] Figure 3 yes Figure 2 AA sectional view;

[0022] Figure 4 It is a three-dimensional diagram of an underground gas storage facility including a drainage structure;

[0023] Figure 5 yes Figure 4 A partial enlarged view of

[0024] Figure 6 yes Figure 4 A partial enlarged view from another angle.

[0025] In the figure: 10- lining; 20- horizontal water collection channel; 30- annular water collection channel; 32- catchment area; 33- catchment area; 50- collection pit; 61- vertical water diversion pipe; 62- longitudinal water diversion pipe; 63- main water diversion pipe; 70- vertical shaft; 71- tunnel. DETAILED DESCRIPTION

[0026] In order 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 embodiments described 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 those skilled in the art without making creative work are within the scope of protection of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless there is a conflict.

[0027] Underground gas storage facilities are located in areas with stable hard rock structures and include at least one gas storage cavity. These cavities can be barrel-shaped, strip-shaped, or annular. Each cavity is sealed with a liner. The sealed space within the liner serves as the gas storage area. A concrete layer and support structures are placed between the outer wall of the liner and the surrounding rock. Under certain operating conditions, underground gas storage facilities require frequent inflation and deflation during operation. During inflation, the gas pressure within the liner increases, causing the liner to expand. This pressure is then transferred through the concrete to the surrounding rock, which then bears the pressure. During deflation, the liner contracts, reducing the gas pressure within the liner and releasing pressure from the surrounding rock. After repeated inflation and deflation, the concrete layer is prone to cracking, allowing groundwater from the surrounding rock to seep into the concrete and pool on the outer wall of the liner. If not promptly drained, this not only creates significant external pressure on the liner but can also corrode metal linings. To this end, this embodiment provides a drainage structure arranged on the outer wall of the lining of the underground gas storage reservoir, which is used to promptly draw out the groundwater around the outer wall of the lining of the gas storage reservoir and discharge it at a fixed point, so that there is no groundwater accumulation around the lining of the gas storage reservoir, and it will not affect the lining of the gas storage reservoir, thereby ensuring that the underground gas storage reservoir can operate safely, continuously and stably for a long time.

[0028] like Figures 1-6 As shown, the drainage structure of this embodiment is arranged on the outer wall of the lining, and is carried out simultaneously with the construction of the lining or after the construction of the lining is completed. After the construction of the lining and the drainage structure of this embodiment is completed, concrete is filled on its outer wall, and the drainage structure of this embodiment is buried in the inner layer of concrete. The drainage structure of this embodiment includes a horizontal water collection channel 20, and the horizontal water collection channel 20 is arranged on the surface of the outer wall of the lining, and the horizontal water collection channel 20 is fixedly connected to the outer wall of the lining. The horizontal water collection channel 20 includes a long strip of groove in the extension direction, and the notch of the groove faces the outer wall of the lining. There is a first water collection port on the horizontal water collection channel 20, and when the underground seepage water flows to the outside of the lining, it flows into the groove of the horizontal water collection channel 20 through the first water collection port.

[0029] One structure of the horizontal water collection channel 20 is that the horizontal water collection channel 20 is a long strip structure with a groove on one side. The material of the horizontal water collection channel 20 can be any hard material, such as plastic, steel, etc. Optionally, the horizontal water collection channel 20 can use steel sections, which are strip-shaped steel materials with a certain cross-sectional shape and size, and have long strip grooves. The cross-sectional shape can be square, circular, angular, C-shaped, V-shaped, L-shaped, W-shaped, A-shaped, etc. Preferably, the horizontal water collection channel 20 uses angle steel, which is a long strip of steel material with two sides perpendicular to each other and forming an angle. It can ensure that it can withstand greater pressure without deformation, can withstand the pressure generated by concrete during the backfilling of concrete, and can withstand the pressure caused by the deformation of the lining and the extrusion and friction of concrete during the later inflation and deflation process.

[0030] One way of connecting the horizontal water collection channel 20 and the lining is: the notch of the groove of the horizontal water collection channel 20 faces the lining, the lower side of the horizontal water collection channel 20 is fully welded to the lining, and the upper side of the horizontal water collection channel 20 is not welded to the lining. At this time, a first water collection port is formed between the upper side of the horizontal water collection channel 20 and the lining. Another structure of the horizontal water collection channel 20 and the lining is: the notch of the groove of the horizontal water collection channel 20 faces the lining, the lower side of the horizontal water collection channel 20 is fully welded to the lining, and the upper side of the horizontal water collection channel 20 is jump-welded to the lining. During jump-welding, the welding points are arranged at intervals, and the unconnected position between two adjacent welding points forms the first water collection port. Another structure of the horizontal water collection channel 20 and the lining is: a plurality of grooves are arranged at intervals on the upper side of the horizontal water collection channel 20. During installation, the position on its upper side without grooves is fully welded or jump-welded to the outer wall of the lining, and the lower side is fully welded to the lining.

[0031] like Figures 1-6 As shown, multiple horizontal water collection channels 20 are provided, and all horizontal water collection channels 20 are arranged in a circular array around the underground gas storage. Preferably, the number of horizontal water collection channels 20 is an even number, so that they can be distributed on both sides of the liner. Figure 1 As shown, four horizontal water collection channels 20 are provided, distributed on both sides of the liner. Furthermore, the number of horizontal water collection channels 20 can also be six, eight, or other, depending on the diameter of the gas storage liner. Preferably, all horizontal water collection channels 20 are distributed on both sides of the liner to facilitate groundwater collection.

[0032] like Figures 1-6 As shown, the drainage structure of this embodiment also includes at least one annular water collecting channel 30 that is arranged crosswise with the horizontal water collecting channel 20 and is interconnected. The annular water collecting channel 30 is an annular structure with a groove on one side, the notch of the groove is arranged toward the lining, and the two side walls of the annular water collecting channel 30 are connected to the outer wall of the lining. The material of the annular water collecting channel 30 can be any hard material, such as plastic, steel, etc. Optionally, the annular water collecting channel 30 can also be made of steel sections, which are strips of steel with a certain cross-sectional shape and size, and their cross-sectional shapes can be square, circular, angular, C-shaped, V-shaped, L-shaped, W-shaped, A-shaped, etc. Preferably, the annular water collecting channel 30 uses channel steel, which is a long strip of steel with a grooved cross-section, which can ensure that it can withstand greater pressure without deformation, can withstand the pressure generated by concrete during the backfilling of concrete, and can withstand the pressure caused by deformation of the lining and extrusion and friction of concrete during the later inflation and deflation process.

[0033] One way to connect the annular water collection channel 30 to the inner lining is to fully weld both side walls of the annular water collection channel 30 to the outer wall of the inner lining. The annular water collection channel 30 is interconnected with the horizontal water collection channel 20 at the intersection, facilitating the introduction of water from the horizontal water collection channel 20 into the annular water collection channel 30.

[0034] Another way of connecting the annular water collection channel 30 with the lining is: the annular water collection channel 30 includes a water collection area 33 whose two side walls are fully welded to the outer wall of the lining and a water collection area 32 provided with a second water collection port, and the water collection area 33 is connected to the water collection area 32 end to end. When used normally after being connected to the lining, the water collection area 32 is located at the top and both sides of the annular water collection channel 30, and the water collection area 33 is located at the bottom of the annular water collection channel 30. The structure of the second water collection port can refer to the structure of the first water collection port. Specifically, as a preference, the annular water collection channel 30 is jump-welded at the water collection area 32 with its two side walls and the outer wall of the lining. During jump welding, the welding points are arranged at intervals, and the unconnected position between the two adjacent welding points forms the second water collection port. Alternatively, one side wall of the annular water collection channel 30 at the water collection area 32 can be jump-welded to the outer wall of the lining, and the other side wall can be fully welded to the outer wall of the lining. Alternatively, a plurality of grooves are arranged at intervals on one or both sides of the annular water collection channel 30 at the water collection area 32, and the positions without grooves are fully welded or jump-welded to the outer wall of the lining, and the jump-welded positions and the positions with grooves form a second water collection port.

[0035] like Figure 4-Figure 5 As shown, a plurality of annular water collecting channels 30 are provided, and the plurality of annular water collecting channels 30 are arranged in an array along the length direction of the gas storage reservoir, so that the water in the horizontal water collecting channel 20 flows into the annular water collecting channel 30 more quickly, thereby improving the drainage speed and drainage flow of the drainage structure.

[0036] like Figure 5 The drainage structure of the underground gas storage reservoir also includes a sump 50 and a water diversion pipe system. The inlet of the water diversion pipe system is connected to the bottom of the annular water collection channel 30, and the outlet of the water diversion pipe system is connected to the sump 50. The sump 50 is located at the lowest point of the underground gas storage reservoir. If the elevation of the underground gas storage reservoir is lower than the drainage point, the water in the sump 50 is discharged from the underground gas storage reservoir through a pumping device. The pumping device can use an existing pump, and the pumping device can be located at any position in the sump 50. If the elevation of the underground gas storage reservoir is higher than the drainage point, the collected water in the sump will be discharged by gravity. The sump 50 is set in the tunnel 71 of the underground gas storage reservoir.

[0037] like Figure 2-Figure 6 As shown, the water diversion pipe system includes a vertical water diversion pipe 61 and a longitudinal water diversion pipe 62. The number of the vertical water diversion pipes 61 is the same as the number of the annular water collecting channels 30, that is, a vertical water diversion pipe 61 is correspondingly provided at the bottom of each annular water collecting channel 30, and each vertical water diversion pipe 61 is connected to the lowest point of the annular water collecting channel 30, and is used to draw out the water in each annular water collecting channel 30. A longitudinal water diversion pipe 62 extending along the direction of extension of the air storage chamber is used to connect all the vertical water diversion pipes 61. Optionally, one end of the longitudinal water diversion pipe 62 is a blind end, the middle is connected to all the vertical water diversion pipes 61, and the other end is connected to the sump 50. Optionally, as Figure 5One end of the longitudinal water diversion pipe 62 is connected to the vertical water diversion pipe 61 located at one of the two ends of the air storage chamber, the middle portion is connected to all the vertical water diversion pipes 61, and the other end is connected to the sump 50. Furthermore, the number of longitudinal water diversion pipes 62 is the same as the number of air storage chambers, that is, one longitudinal water diversion pipe 62 is equipped for each air storage chamber.

[0038] like Figure 2-Figure 6 As shown, the water diversion pipe system also includes a main water diversion pipe 63. When there are multiple air storage chambers in the air storage reservoir, if a longitudinal water diversion pipe 62 is set on the lower side of each air storage chamber, all the longitudinal water diversion pipes 62 are connected to the sump 50 through the main water diversion pipe 63.

[0039] like Figure 4 If the underground gas storage reservoir includes more than two groups of gas storage chambers, adjacent gas storage chambers are connected by connecting tunnels, which are connected to the ground through vertical shafts 70 or inclined shafts. In this case, a preferred arrangement of the drainage structure arranged in each gas storage chamber is as follows: each gas storage chamber is provided with at least one group of horizontal water collection channels 20 and at least one annular water collection channel 30, with the horizontal water collection channels 20 arranged along the length of the gas storage chamber, and the annular water collection channels 30 arranged crosswise with the horizontal water collection channels 20. The bottom of each annular water collection channel 30 is connected to a vertical water diversion pipe 61, and all vertical water diversion pipes 61 are connected to the longitudinal water diversion pipe 62. A sump 50 is provided in the underground gas storage reservoir, and the sump 50 is arranged in the tunnel. Each longitudinal water diversion pipe 62 is connected to the sump 50 through a main water diversion pipe 63. The water in the sump 50 is pumped to the ground through a pump, and the pump's outlet pipe leads to the ground through the vertical shaft 70 or inclined shaft.

[0040] The drainage process of the above-mentioned underground gas storage reservoir is as follows: when the groundwater flow channel is lined with the outer wall, a portion of the groundwater enters the horizontal water collection channel 20 through the first water collection port, and then the groundwater enters the annular water collection channel 30. Under the action of gravity, the groundwater enters the vertical water diversion pipe 61, enters the longitudinal water diversion pipe 62 through the vertical water diversion pipe 61, and finally is discharged into the sump 50 through the main water diversion pipe 63. Another portion of the groundwater enters the catchment area 32 of the annular water collection channel 30 through the second water collection port, and under the action of gravity, enters the catchment area 33 of the annular water collection channel 30, the vertical water diversion pipe 61, the longitudinal water diversion pipe 62 and the main water diversion pipe 63, and finally is discharged into the sump 50. There is a drainage pump in the sump 50, and the above-mentioned groundwater is discharged through the drainage pump.

[0041] Furthermore, the middle position of the horizontal water collection channel 20 is at a different height from the positions on both sides, and the middle position is smoothly connected to the positions on both sides. One embodiment is that the middle position is higher than the positions on both sides, so that the collected groundwater is drained to both sides. In this case, the water collection pit 50 can be set in the tunnel near both sides. Another embodiment is that the middle position is lower than the positions on both sides, so that the groundwater collected on both sides flows back to the middle. In this case, the water collection pit 50 can be set in the tunnel near the middle. When the middle position of the horizontal water collection channel 20 is set lower than the positions on both sides, the number of water collection pits 50 to be constructed can be reduced.

[0042] The drainage process of the underground gas storage drainage structure of this embodiment is as follows: the underground gas storage includes at least one gas storage cavity, each of which is equipped with multiple horizontal water collection channels 20 and annular water collection channels 30. Each horizontal water collection channel 20 has a first water collection port, and each annular water collection channel 30 has a second water collection port. Groundwater seeps into the horizontal water collection channels 20 and annular water collection channels 30 through the multiple first and second water collection ports, ultimately entering the catchment area 32 of the annular water collection channels 30. Groundwater in the catchment area 32 flows through vertical water diversion pipes 61 into longitudinal water diversion pipes 62. Groundwater in each longitudinal water diversion pipe 62 flows through a main water diversion pipe 63 into a sump 50. If the underground gas storage is located below the drainage surface, water is drained from the sump 50 using a pumping device. The pumping device can be a pump and can be located anywhere in the sump 50. If the underground gas storage is located above the drainage surface, the collected water in the sump drains by gravity.

[0043] Based on this, the underground gas storage drainage structure of this embodiment can efficiently drain underground water seeping from the inner lining and outer walls, ensuring the stability of the gas storage. Its simple structure can withstand high pressure and load, adapting to frequent charging and discharging scenarios, making it ideally suited for underground gas storage in compressed air energy storage power stations. Because the underground gas storage is equipped with this drainage structure, the compressed air energy storage power station can operate safely, continuously and stably for long periods of time, enabling large-scale, long-term energy storage.

[0044] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and 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 in specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0046] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A drainage structure for an underground gas storage, characterized in that: The drainage structure is arranged on the outer wall of the air storage cavity liner; The drainage structure comprises a horizontal water collection channel arranged on the outer wall of the inner liner, the horizontal water collection channel has a first water collection port, and water flows into the horizontal water collection channel from the first water collection port; an annular water collecting channel arranged crosswise with the horizontal water collecting channel and interconnected with each other, so that water in the horizontal water collecting channel can flow into the annular water collecting channel; A water diversion pipe system is arranged at the bottom of the annular water collection channel, one end of the water diversion pipe system is connected to the annular water collection channel, and the other end of the water diversion pipe system leads to the water collection pit of the underground gas storage reservoir.

2. The drainage structure of the underground gas storage according to claim 1, characterized in that: The annular water collection channel includes a water collection area and a water collection area provided with a second water collection port, the water collection area is connected end to end with the water collection area, the water collection area is located at the upper part of the lining, the water collection area is located at the lower part of the lining, and the water collection area has a second water collection port.

3. The drainage structure of the underground gas storage according to claim 1, characterized in that: The water diversion pipe system includes at least one vertical water diversion pipe, and each of the vertical water diversion pipes is connected to the lowest point of the annular water collecting channel.

4. The drainage structure of the underground gas storage according to claim 3 is characterized in that: The water diversion pipe system also includes a longitudinal water diversion pipe, which is connected to all the vertical water diversion pipes and introduces water into the sump of the underground gas storage reservoir.

5. The drainage structure of the underground gas storage according to claim 1, characterized in that: The horizontal water collection channel and the outer wall of the liner are welded by skip welding, and two adjacent welding points form the first water collection port.

6. The drainage structure of the underground gas storage according to claim 1, characterized in that: The annular water collecting channel and the outer wall of the lining are welded by full welding.

7. The drainage structure of the underground gas storage according to claim 2, characterized in that: The water collection area and the inner lining are welded by skip welding, and the water collection area and the inner lining are welded by full welding.

8. The drainage structure of the underground gas storage according to claim 1, characterized in that: The horizontal water collection channel adopts angle steel.

9. The drainage structure of the underground gas storage according to claim 1, characterized in that: The annular water collection channel is made of channel steel.

10. A compressed air energy storage power station, characterized in that: It comprises an underground gas storage reservoir, and the underground gas storage reservoir comprises the drainage structure of the underground gas storage reservoir according to any one of claims 1-9.

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