Injection-production pipe assembly for salt cavern compressed air energy storage

Abstract

The invention relates to the technical field of compressed air energy storage, in particular to an injection-production pipe assembly for salt cavern compressed air energy storage, which comprises an injection-production pipe and a deformable suction pipe orifice, and the deformable suction pipe orifice comprises a movable ring, a fixed ring, a driving device, a plurality of support rods and a plurality of arc petals; a plurality of first rotating shafts are arranged on the outer wall of the movable ring; the inner wall of the fixed ring is connected with the outer wall of the injection-production pipe; a plurality of second rotating shafts are arranged on the outer wall of the fixed ring; the supporting rods are connected with the corresponding first rotating shafts and second rotating shafts; the arc petals are connected with the corresponding second rotating shafts; the upper ends of the arc petals are arranged around the outer wall of the injection-production pipe, and the lower parts of the arc petals are positioned below the gas inlet; in the process that the injection-production pipe descends into a well, the supporting rod is in a vertical state, and the arc petals are in a vertical state and are in a circulating overlying state. After the air inlet of the injection-production pipe enters the salt cavern, the driving device drives the moving ring to rotate unidirectionally around the axis of the injection-production pipe, and the supporting rod is driven to incline, so that the arc petals are in an umbrella-shaped opening state. According to the scheme, the air suction efficiency and stability can be improved.

Description

Technical Field

[0001] This specification relates to the technical field of compressed air energy storage, and particularly to an injection-production pipe assembly for salt cavern compressed air energy storage. Background Art

[0002] Compressed air energy storage (CAES), as a long-duration energy storage technology, has the characteristics of fast start-stop, long cycle life, and strong load adaptability, and has broad application prospects in peak shaving and valley filling, new energy consumption, frequency modulation and peak regulation, etc. Traditional CAES systems rely on fossil fuels, while new CAES systems do not consume fossil fuels, have a simple process and high efficiency, and are developing towards a more environmentally friendly and efficient direction. The salt cavern compressed air energy storage power generation system is a renewable energy storage method that uses underground salt caverns to store compressed air and releases the air to drive a generator set to generate electricity during peak power demand.

[0003] The salt cavern compressed air energy storage technology compresses air with the help of salt caverns to achieve energy storage and conversion, and has the advantages of large capacity, long life, low cost, fast response, flexible operation, high efficiency, less pollution, and small land occupation. As one of the important forms of new energy storage, salt cavern compressed air energy storage has received more and more attention. The field of salt cavern compressed air energy storage power generation systems is developing rapidly, technology is constantly advancing, project implementation and demonstration effects are remarkable, application prospects are broad, and it has a positive impact on both the environment and economic benefits.

[0004] In the salt cavern compressed air energy storage power generation system, the injection-production pipe nozzle, as the terminal of the gas transmission system, its air intake capacity and filtering capacity have a direct impact on the power generation performance and operation stability performance of the compressed air energy storage power station. However, the current nozzle design is simple and basically a bare hole. This design not only affects the performance of the filtering device itself, but may also have the following negative impacts on the efficiency and reliability of the entire compressed air energy storage system. On the one hand, the air intake efficiency is low. Limited by the wellbore size, the diameter of the intake port of the injection-production pipe is small, and the intake pressure drop is significant. On the other hand, the air intake capacity is unstable. The current intake ports are basically bare holes without any rectifying and filtering devices. The external air of the bare hole is easy to form high-speed vortices, and the high-speed vortices carry solid and liquid particles in the salt cavern cavity into the pipeline, causing pipeline blockage and unit failure, and increasing the maintenance cost.

[0005] In response to the above problems, no effective solution has been proposed yet. Summary of the Invention

[0006] The embodiments of this specification provide an injection-production pipe assembly for salt cavern compressed air energy storage to solve the problems of low air intake efficiency and unstable air intake capacity of the injection-production pipes in existing salt cavern compressed air energy storage power stations.

[0007] An embodiment of this specification provides an injection-production pipe assembly for compressed air energy storage in a salt cavern, including an injection-production pipe and a deformable suction pipe orifice. The deformable suction pipe orifice is arranged around the outer wall of the injection-production pipe and is close to the air inlet of the injection-production pipe. The deformable suction pipe orifice can extend into the salt cavern through an injection-production well.

[0008] The movable ring can rotate unidirectionally around the axis of the injection-production pipe under the drive of the driving device. A plurality of first rotating shafts are arranged on the outer wall of the movable ring in the circumferential direction. The fixed ring is located below the movable ring. The inner wall of the fixed ring is fixedly connected to the outer wall of the injection-production pipe. A plurality of second rotating shafts are arranged on the outer wall of the fixed ring in the circumferential direction. The plurality of support rods respectively correspond to the plurality of first rotating shafts and the plurality of second rotating shafts one by one. The support rods are used to connect the corresponding first rotating shafts and the corresponding second rotating shafts. The plurality of arc-shaped flaps respectively correspond to the plurality of second rotating shafts. The arc-shaped flaps are connected to the corresponding second rotating shafts. The upper ends of the plurality of arc-shaped flaps are arranged around the outer wall of the injection-production pipe. The lower parts of the plurality of arc-shaped flaps are located below the air inlet.

[0009] During the process of the injection-production pipe being lowered into the well, the plurality of support rods are in a vertical state, and the plurality of arc-shaped flaps are in a vertical state and in a cyclic overlapping and pressing state. After the air inlet of the injection-production pipe enters the salt cavern, the driving device is used to drive the movable ring to rotate unidirectionally around the axis of the injection-production pipe, driving the plurality of support rods to incline, so that the plurality of arc-shaped flaps are in an umbrella-shaped open state.

[0010] In one embodiment, the injection-production pipe assembly further includes:

[0011] A filter screen, which is arranged in the injection-production pipe and is close to the air inlet of the injection-production pipe, and is used to filter the gas flowing into the injection-production pipe.

[0012] In one embodiment, a first hole is arranged on the first rotating shaft; a second hole is arranged on the second rotating shaft;

[0013] The first end of the support rod is connected to the corresponding first rotating shaft through the first hole, and the second end of the support rod is connected to the corresponding second rotating shaft through the second hole;

[0014] The second end of the support rod passes through the second hole of the corresponding second rotating shaft and is connected to the arc-shaped flap corresponding to the second rotating shaft.

[0015] In one embodiment, the driving device includes:

[0016] A driving member, which is used to drive the moving ring to rotate around the axis of the injection-production pipe in a first direction after the injection-production pipe enters the salt cavern; the first direction is the clockwise direction or the counterclockwise direction;

[0017] A limiting mechanism, which is used to limit the moving ring after the driving member drives the moving ring to rotate, so as to prevent the moving ring from rotating around the axis of the injection-production pipe in a second direction; the second direction is opposite to the first direction.

[0018] In one embodiment, the limiting mechanism includes a ratchet mechanism, and the ratchet mechanism is located between the moving ring and the outer wall of the injection-production pipe; the ratchet mechanism includes a ratchet and a pawl; the ratchet is arranged around the outer wall of the injection-production pipe and can rotate around the axis of the injection-production pipe; one end of the pawl is rotatably installed on the inner wall of the moving ring, and the other end of the pawl is in contact with the gear of the ratchet;

[0019] The driving member includes a spring driving member, the spring driving member is arranged around the outer wall of the injection-production pipe, one end of the spring driving member is fixedly connected to the outer wall of the injection-production pipe, and the other end of the spring driving member is fixedly connected to the inner side of the ratchet; during the process of the injection-production pipe being lowered into the well, the spring driving member is in a deformed state; after the injection-production pipe enters the salt cavern, when the spring driving member returns to its original length, it drives the ratchet to rotate around the axis of the injection-production pipe, so that the moving ring rotates around the axis of the injection-production pipe under the action of the pawl, and further drives the plurality of support rods to incline, so that the plurality of arc-shaped flaps are in an umbrella-shaped open state.

[0020] In one embodiment, the limiting mechanism includes a buckle mechanism, and the buckle mechanism includes a buckle and a card slot; one end of the buckle is compressibly installed on the outer wall of the injection-production pipe through an elastic member, and the other end of the buckle is smoothly inclined and in contact with the inner wall of the moving ring; the card slot is arranged on the inner wall of the moving ring; when the moving ring rotates around the axis of the injection-production pipe to make the buckle snap into the card slot, the moving ring enters a locked state;

[0021] The driving member includes a spring driving member, the spring driving member is arranged around the outer wall of the injection-production pipe, one end of the spring driving member is fixedly connected to the outer wall of the injection-production pipe, and the other end of the spring driving member is fixedly connected to the inner side of the moving ring; during the process of the injection-production pipe being lowered into the well, the spring driving member is in a deformed state; after the injection-production pipe enters the salt cavern, when the spring driving member returns to its original length, it drives the moving ring to rotate around the axis of the injection-production pipe, and further drives the plurality of support rods to incline, so that the plurality of arc-shaped flaps are in an umbrella-shaped open state.

[0022] In one embodiment, the limiting mechanism includes a ratchet mechanism, and the ratchet mechanism is located between the moving ring and the outer wall of the injection-production pipe; the ratchet mechanism includes a ratchet and a pawl; the ratchet is arranged around the outer wall of the injection-production pipe and can rotate around the axis of the injection-production pipe; one end of the pawl is rotatably installed on the inner wall of the moving ring, and the other end of the pawl is in contact with the gear of the ratchet;

[0023] The driving member includes a pressure tank assembly, and the pressure tank assembly includes a pressure tank and a transmission mechanism; the pressure tank is arranged on the outer wall of the injection-production pipe between the moving ring and the fixed ring; high-pressure gas is contained in the pressure tank; one end of the transmission mechanism is connected to the pressure tank, and the other end of the transmission mechanism is connected to the ratchet; during the process of the injection-production pipe being lowered into the well, the pressure tank assembly is in a locked state; after the injection-production pipe enters the salt cavern, the pressure tank is unlocked, and the high-pressure gas in the pressure tank releases pressure to drive the transmission mechanism to drive the ratchet to rotate around the axis of the injection-production pipe, so that the moving ring rotates around the axis of the injection-production pipe under the action of the pawl, and then drives the plurality of support rods to incline, so that the plurality of arc-shaped flaps are in an umbrella-shaped open state.

[0024] In one embodiment, the limiting mechanism includes a buckle mechanism, and the buckle mechanism includes a buckle and a card slot; one end of the buckle is compressibly installed on the outer wall of the injection-production pipe through an elastic member, and the other end of the buckle is arranged in a smooth inclined manner and is in contact with the inner wall of the moving ring; the card slot is arranged on the inner wall of the moving ring; when the moving ring rotates around the axis of the injection-production pipe to make the buckle snap into the card slot, the moving ring enters a locked state;

[0025] The driving member includes a pressure tank assembly, and the pressure tank assembly includes a pressure tank and a transmission mechanism; the pressure tank is arranged on the outer wall of the injection-production pipe between the moving ring and the fixed ring; high-pressure gas is contained in the pressure tank; one end of the transmission mechanism is connected to the pressure tank, and the other end of the transmission mechanism is connected to the moving ring; during the process of the injection-production pipe being lowered into the well, the pressure tank assembly is in a locked state; after the injection-production pipe enters the salt cavern, the pressure tank is unlocked, and the high-pressure gas in the pressure tank releases pressure to drive the transmission mechanism to drive the moving ring to rotate around the axis of the injection-production pipe, and then drives the plurality of support rods to incline, so that the plurality of arc-shaped flaps are in an umbrella-shaped open state.

[0026] In one embodiment, the arc-shaped flap satisfies at least one of the following:

[0027] The included angle of the arc-shaped flap is 36° to 60°;

[0028] The ratio of the length of the arc-shaped flap to the diameter of the injection-production pipe is 0.8 to 1.5;

[0029] The number of the arc-shaped petals is from 6 to 10;

[0030] The arc-shaped petals are made of metal.

[0031] In one embodiment, the opening radius when the plurality of arc-shaped petals are in an umbrella-shaped open state is:

[0032]

[0033] wherein, r is the opening radius when the plurality of arc-shaped petals are in an umbrella-shaped open state, Q is the exhaust volume of the air inlet of the injection-production pipe, and v is the air flow velocity of the air inlet.

[0034] In an embodiment of this specification, a injection-production pipe assembly for compressed air energy storage in a salt cavern is provided, which includes an injection-production pipe and a deformable suction pipe orifice. The deformable suction pipe orifice is arranged around the outer wall of the injection-production pipe and is close to the air inlet of the injection-production pipe. The deformable suction pipe orifice includes a moving ring, a fixed ring, a driving device, a plurality of support rods and a plurality of arc flaps. The deformable suction pipe orifice can extend into the salt cavern through an injection-production well. The moving ring can rotate unidirectionally around the axis of the injection-production pipe under the drive of the driving device. A plurality of first rotating shafts are arranged on the outer wall of the moving ring in the circumferential direction. The fixed ring is located below the moving ring. The inner wall of the fixed ring is fixedly connected to the outer wall of the injection-production pipe. A plurality of second rotating shafts are arranged on the outer wall of the fixed ring in the circumferential direction. The plurality of support rods respectively correspond to the plurality of first rotating shafts and the plurality of second rotating shafts one by one. The support rods are used to connect the corresponding first rotating shafts and the corresponding second rotating shafts. The plurality of arc flaps respectively correspond to the plurality of second rotating shafts. The arc flaps are connected to the corresponding second rotating shafts. The upper ends of the plurality of arc flaps are arranged around the outer wall of the injection-production pipe. The lower parts of the plurality of arc flaps are located below the air inlet. During the process of the injection-production pipe being lowered into the well, the plurality of support rods are in a vertical state, and the plurality of arc flaps are in a vertical state and in a cyclic overlapping state. After the air inlet of the injection-production pipe enters the salt cavern, the driving device is used to drive the moving ring to rotate unidirectionally around the axis of the injection-production pipe, driving the plurality of support rods to incline, so that the plurality of arc flaps are in an umbrella-shaped open state. In the above solution, during the process of the injection-production pipe assembly being lowered into the well, the deformable suction pipe orifice is in a contracted state (that is, the plurality of arc flaps are in a vertical state and in a cyclic overlapping state), which can reduce the area of the deformable suction pipe orifice and reduce the size requirement for the diameter of the injection-production well, thereby reducing the construction cost of the injection-production well. After the injection-production pipe assembly enters the salt cavern, the deformable suction pipe orifice is in an open state, and the suction area is greatly increased compared with the traditional bare hole design. This enables more compressed air to be inhaled per unit time, thereby improving the suction efficiency of the injection-production pipe and further enhancing the working efficiency of the entire compressed air energy storage system in the salt cavern. In addition, the umbrella-shaped structure can rectify the air flow, making the air flow enter the injection-production pipe more smoothly. By reducing the turbulence and eddy current phenomena of the air flow, the energy loss of the air flow is reduced, the stability of the air flow is improved, and thus the stability of the suction capacity is improved. The smooth air flow reduces the carrying capacity of solid and liquid particulate matters in the salt cavern cavity. Under the rectifying action, large particle impurities are more likely to settle due to gravity and are not easily carried into the injection-production pipe by the air flow, thereby reducing the wear and blockage of the pipeline and subsequent equipment by impurities and extending the service life of the equipment.

[0035] Referring to the following description and the accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby. Features described and / or illustrated for one embodiment can be used in the same or similar way in one or more other embodiments, combined with the features in other embodiments, or replace the features in other embodiments.

[0036] It should be emphasized that when the term "comprising / including" is used herein, it refers to the presence of features, components or elements, but does not exclude the presence or addition of one or more other features, components or elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. Additionally, the shapes and proportional dimensions of the components in the figures are only schematic and are used to assist in understanding the present invention, and do not specifically define the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can, under the teachings of the present invention, select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention. In the drawings:

[0038] Figure 1 shows a schematic diagram of the application scenario of the injection-production pipe assembly in an embodiment of the present specification;

[0039] Figure 2 shows a schematic diagram of the structure of the injection-production pipe assembly in an embodiment of the present specification;

[0040] Figure 3 shows a schematic diagram of the structure of the injection-production pipe assembly in an embodiment of the present specification;

[0041] Figure 4 shows a schematic diagram of the structure of the spring drive in an embodiment of the present specification;

[0042] Figure 5 shows a partial top view of the injection-production pipe assembly in an embodiment of the present specification;

[0043] Figure 6 shows a partial structural diagram of the injection-production pipe assembly in an embodiment of the present specification;

[0044] Figure 7 shows a partial top view of the injection-production pipe assembly in the locked state of the buckle in an embodiment of the present specification;

[0045] Figure 8 shows a partial top view of the injection-production pipe assembly in the unlocked state of the buckle in an embodiment of the present specification;

[0046] Figure 9 shows a schematic diagram of the structure of the injection-production pipe assembly driven by a pressure tank in an embodiment of the present specification.

[0047] Reference numerals of the above drawings:

[0048] 1. Injection-production pipe assembly; 10. Injection-production pipe; 20. Deformable suction pipe orifice; 30. Filter screen; 21. Moving ring; 211. First rotating shaft; 22. Fixed ring; 221. Second rotating shaft; 24. Support rod; 25. Arc flap; 231. Ratchet; 232. Pawl; 233. Spring; 234. Buckle; 235. Card slot; 236. Spring drive member; 237. Elastic member; 238. Pressure tank; 239. Transmission mechanism;

[0049] 2. Salt cavern; 3. Ground; 4. Collection tree. Specific embodiments

[0050] The principles and spirit of this specification will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and then implement this specification, and not to limit the scope of this specification in any way. On the contrary, these embodiments are provided to make this specification disclosure more thorough and complete, and to be able to convey the scope of this disclosure fully to those skilled in the art.

[0051] Combined with the description of the specific embodiments of the present invention and the accompanying drawings, the details of the present invention can be understood more clearly. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and cannot be understood in any way as a limitation of the present invention. Under the teaching of the present invention, those skilled in the art can conceive any possible variations based on the present invention, and these should all be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this specification belongs. The terms used herein in this specification are only for the purpose of describing specific embodiments and are not intended to limit this specification. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0053] In a salt cavern compressed air energy storage power generation system, the injection-production pipe orifice, as the terminal of the gas transmission system, its air intake capacity and filtering capacity have a direct impact on the power generation performance and operation stability of the compressed air energy storage power station. However, the current orifice design is simple and basically a bare hole. This design not only affects the performance of the filtering device itself but may also have the following negative impacts on the efficiency and reliability of the entire compressed air energy storage system. On the one hand, the air intake efficiency is low. Limited by the wellbore size, the diameter of the intake port of the injection-production pipe is small, and the intake pressure drop is significant. On the other hand, the air intake capacity is unstable. The current intake ports are basically bare holes without any rectifying and filtering devices. High-speed vortices are easily formed in the external air of the bare hole. The high-speed vortices carry solid and liquid particulate matters in the salt cavern into the pipeline, causing pipeline blockage and unit failures, and increasing maintenance costs.

[0054] Based on the above problems, the embodiments of this specification provide an injection-production pipe assembly for salt cavern compressed air energy storage. Please refer to Figure 1 、 Figure 2 and Figure 3 , which respectively show the application scenario diagram, the structural schematic diagrams in the open state and the contracted state of the injection-production pipe assembly for salt cavern compressed air energy storage in an embodiment of this specification.

[0055] The injection-production pipe assembly in this embodiment can be applied to salt cavern compressed air energy storage equipment. As shown in Figure 1 , the salt cavern compressed air energy storage equipment may include a salt cavern 2, an injection-production pipe assembly 1, and a collection tree 4. The injection-production pipe assembly 1 includes an injection-production pipe 10 and a deformable intake orifice 20. The injection-production pipe 10 and the deformable intake orifice 20 can extend from the ground 3 into the salt cavern 2 via the injection-production well. During operation, air is inhaled through the deformable intake orifice 20. Due to the suspension and mixing of turbulent flow particles, the possibility of being carried by the air flow is increased. Therefore, in the embodiments of this specification, the intake area is enlarged through the deformable intake orifice 20, the flow velocity is reduced, the velocity gradient is decreased, thereby reducing the Reynolds number and suppressing the formation of turbulence, achieving rectification. The rectified air flow is more stable, and the particles are more likely to settle to the bottom of the salt cavern under the action of gravity rather than being carried into the pipeline by the high-speed air flow, thus reducing the risk of pipeline blockage and unit failures and reducing maintenance costs.

[0056] As shown in Figure 2 and Figure 3 , the injection-production pipe assembly 1 in the embodiments of this specification may include an injection-production pipe 10 and a deformable intake orifice 20. The injection-production pipe 10 serves as a channel for injecting and extracting compressed air from the salt cavern. As shown in Figure 2 and Figure 3 , the deformable intake orifice 20 is arranged around the outer wall of the injection-production pipe 10 and close to the intake port of the injection-production pipe 10. Its special structure can improve the air intake efficiency and improve the air flow condition.

[0057] The injection-production pipe 10 is the foundation of the entire component and the key channel for compressed air to enter and exit the salt cavern. Its material is usually selected as a high-strength and corrosion-resistant metal material, such as stainless steel, to ensure long-term stable operation in the complex environment of the salt cavern. The pipe diameter of the injection-production pipe 10 needs to be determined according to the actual energy storage scale and design flow rate.

[0058] The deformable suction pipe orifice 20 can include a moving ring 21, a fixed ring 22, a driving device, a plurality of support rods 24, and a plurality of arc-shaped flaps 25. The deformable suction pipe orifice 20 and the lower end of the injection-production pipe 10 can penetrate into the salt cavern through the injection-production well.

[0059] The moving ring 21 can rotate unidirectionally around the axis of the injection-production pipe 10 under the drive of the driving device. The unidirectional rotation of the moving ring 21 means that the moving ring 21 can only rotate clockwise or counterclockwise around the axis of the injection-production pipe 10. A plurality of first rotating shafts 211 are arranged circumferentially on the outer wall of the moving ring 21. The first rotating shafts 211 can rotate along their own axes. These first rotating shafts 211 are key components connecting the support rods 24, and their number is usually the same as the number of support rods 24. For example, it can be set to 6 - 10. The rotation of the moving ring 21 provides the power source for driving the subsequent movement of the support rods 24 and the arc-shaped flaps 25.

[0060] The fixed ring 22 is located below the moving ring 21. The inner wall of the fixed ring 22 is fixedly connected to the outer wall of the injection-production pipe 10 to ensure the stability of the entire structure of the deformable suction pipe orifice 20. A plurality of second rotating shafts 221 are arranged circumferentially on the outer wall of the fixed ring 22. The second rotating shafts 221 can rotate along their own axes. These second rotating shafts 221 correspond to the first rotating shafts 211 one by one and are connected to the support rods 24 and the arc-shaped flaps 25. The fixed ring 22 plays a role in support and positioning, ensuring the relative position relationship between the components.

[0061] The driving device is the core component for realizing the automatic opening and closing of the deformable suction pipe orifice 20. Its function is to drive the moving ring 21 to rotate unidirectionally around the axis of the injection-production pipe 10 after the injection-production pipe 10 enters the salt cavern. The driving device can have various forms, such as being driven by a spring driving member 236 and a pressure tank 238. The spring driving member 236 driving usually uses a shape memory alloy spring driving member 236. When the injection-production pipe 10 enters the salt cavern, changes in environmental factors such as temperature cause the spring driving member 236 to return to its original length, thereby driving the rotation of the moving ring 21. The pressure tank 238 driving utilizes the pressure difference inside and outside the salt cavern to push the moving ring 21 to rotate.

[0062] A plurality of support rods 24 respectively correspond one-to-one with a plurality of first rotating shafts 211 and a plurality of second rotating shafts 221. That is, the number of support rods 24, first rotating shafts 211, and second rotating shafts 221 is the same and they correspond one-to-one. The support rod 24 is used to connect the corresponding first rotating shaft 211 and the corresponding second rotating shaft 221. When the moving ring 21 rotates, the support rod 24 will tilt along with the movement of the moving ring 21, thereby driving the opening and closing of the arc-shaped flap 25.

[0063] A plurality of arc-shaped flaps 25 correspond one-to-one with a plurality of second rotating shafts 221, and the arc-shaped flap 25 is connected to the corresponding second rotating shaft 221. The number of arc-shaped flaps 25 is the same as the number of second rotating shafts 221. The upper ends of the plurality of arc-shaped flaps 25 are arranged around the outer wall of the injection-production pipe 10, and the lower parts of the plurality of arc-shaped flaps 25 are located below the air inlet. The arc-shaped flaps 25 of the umbrella-shaped structure can guide the airflow to flow in a specific direction, reduce the generation of local eddies, thereby reducing the possibility of particles staying in the eddies and being involved in the pipeline.

[0064] In some embodiments of this specification, the arc-shaped flap 25 is usually made of metal, such as aluminum alloy, and has a certain strength and flexibility. Its included angle is generally 36° to 60°, and the ratio of the flap length to the diameter of the injection-production pipe 10 is 0.8 to 1.5. This design can not only ensure reducing the downhole resistance in the closed state, but also effectively expand the air intake area in the unfolded state.

[0065] During the process of the injection-production pipe 10 being lowered into the well, in order to reduce the resistance during lowering and avoid damage to the structure, a plurality of support rods 24 are in a vertical state, and a plurality of arc-shaped flaps 25 are in a vertical state and in a cyclic overlapping and pressing state. At this time, the deformable suction nozzle 20 is in a closed state, and the overall structure is compact, which is convenient for smoothly passing through the injection-production well and entering the salt cavern.

[0066] After the air inlet of the injection-production pipe 10 enters the salt cavern, the driving device starts to function. The driving device drives the moving ring 21 to rotate unidirectionally around the axis of the injection-production pipe 10, and the rotation of the moving ring 21 drives a plurality of support rods 24 to tilt. As the support rods 24 tilt, a plurality of arc-shaped flaps 25 gradually open and finally are in an umbrella-shaped open state. At this time, the suction area of the deformable suction nozzle 20 increases significantly, and it can inhale the compressed air in the salt cavern more efficiently, improving the suction efficiency.

[0067] In the above embodiments, during the process of lowering the injection-production pipe assembly 1 into the well, the deformable suction pipe orifice 20 is in a contracted state, which can reduce the area of the deformable suction pipe orifice 20 and lower the size requirement for the injection-production wellbore diameter, thereby reducing the construction cost of the injection-production well. After the injection-production pipe assembly 1 enters the salt cavern, the deformable suction pipe orifice 20 is in an open state, and the suction area is significantly increased compared with the traditional open-hole design. This enables more compressed air to be inhaled per unit time, thereby improving the suction efficiency of the injection-production pipe 10 and further enhancing the working efficiency of the entire salt cavern compressed air energy storage system. In addition, the umbrella-shaped structure can rectify the air flow, making the air flow enter the injection-production pipe 10 more smoothly. By reducing the turbulence and eddy current phenomena of the air flow, the energy loss of the air flow is reduced, the stability of the air flow is improved, and thus the stability of the suction capacity is enhanced. The smooth air flow reduces the carrying capacity of solid and liquid particulate matters in the salt cavern cavity. Under the rectifying action, large particle impurities are more likely to settle due to gravity and are not easily carried into the injection-production pipe 10 by the air flow, thereby reducing the wear and blockage of the pipeline and subsequent equipment by impurities and extending the service life of the equipment. Further, the deformable structure of the deformable suction pipe orifice 20 enables it to be dynamically adjusted according to the actual working conditions and gas flow rate in the salt cavern. In some embodiments, when the gas flow rate is large, the arc-shaped flaps 25 can be further unfolded to adapt to a greater suction demand. In other embodiments, when the gas flow rate is small, the arc-shaped flaps 25 can be appropriately contracted to maintain the stability of the air flow. This dynamic adaptability improves the operating efficiency and reliability of the system under different working conditions.

[0068] As Figure 2 shown, in some embodiments of the present specification, the injection-production pipe assembly 1 may further include a filter screen 30. The filter screen 30 is disposed inside the injection-production pipe 10 and near the air inlet of the injection-production pipe 10 for filtering the gas flowing into the injection-production pipe 10. The filter screen 30 can filter the gas just when it enters the injection-production pipe 10, minimizing the possibility of impurities entering the subsequent pipeline and equipment.

[0069] In one embodiment, the filter screen 30 adopts a multi-layer structure design and may include a front metal mesh and a rear precision filter element. The aperture of the front metal mesh is generally between 1 - 3 mm, mainly used to intercept larger solid particles, such as large pieces of salt slag falling off in the salt cavern. The rear precision filter element has a higher precision, generally between 5 - 10 μm, and can further filter out tiny particles and some liquid impurities. The front metal mesh is generally made of stainless steel, such as 304 stainless steel or 316L stainless steel. These materials have good corrosion resistance and relatively high strength, and can be used in the humid and high salinity environment in the salt cavern for a long time without being damaged. At the same time, the metal mesh made of stainless steel is easy to clean and maintain, and the intercepted large particle impurities can be removed by back blowing and other methods. The material of the rear precision filter element can be determined according to specific filtration requirements and working conditions. Commonly used ones include paper filter elements, fiber filter elements or sintered metal filter elements. The paper filter element has a relatively low cost and high filtration precision, but relatively poor moisture resistance and durability; the fiber filter element has good filtration performance and certain moisture resistance; the sintered metal filter element has high strength, corrosion resistance and high temperature resistance, and is suitable for relatively harsh environments, but the cost is relatively high. When the gas in the salt cavern enters the injection-production pipe 10 through the deformable suction pipe orifice 20, it first passes through the front metal mesh. The larger aperture of the metal mesh can effectively intercept solid particles with larger sizes, and these particles will adhere to the metal mesh. As the gas continues to flow, it enters the rear precision filter element. The tiny pores of the precision filter element can capture smaller particles and some liquid impurities, further purifying the gas. When the gas passes through the entire filter screen 30, most of the impurities in it are basically removed, ensuring the cleanliness of the gas entering the subsequent pipelines and equipment.

[0070] In some embodiments of this specification, in order to ensure the long-term effective operation of the filter screen 30, a self-cleaning function can be realized. Specifically, in the injection-production pipe assembly 1, when the arc flap 25 of the deformable suction pipe orifice 20 performs an opening and closing movement, a pulsed air flow will be generated. This pulsed air flow can blow back towards the filter screen 30, blowing off the impurities adhering to the metal mesh and the filter element, thereby achieving the purpose of self-cleaning. In other embodiments, a vibration device can also be set on the filter screen 30 to vibrate the filter screen 30 regularly to assist in removing impurities.

[0071] In the above embodiments, by setting the filter screen 30, impurities in the gas can be filtered out, which can effectively reduce the wear and corrosion of subsequent pipelines, valves, compressors and other equipment by impurities, and can also avoid the occurrence of pipeline blockage, ensuring the stable operation of the system. Moreover, the clean gas can flow more smoothly in the pipeline, reducing the air flow resistance and energy loss, thereby improving the efficiency of the entire energy storage system. In addition, due to the reduction of equipment wear and pipeline blockage, the maintenance frequency and maintenance cost of the system are significantly reduced.

[0072] In some embodiments of the present specification, a first hole is provided on the first rotating shaft 211. A second hole is provided on the second rotating shaft 221. The first end of the support rod 24 is connected to the corresponding first rotating shaft 211 via the first hole, and the second end of the support rod 24 is connected to the corresponding second rotating shaft 221 via the second hole. The second end of the support rod 24 passes through the second hole of the corresponding second rotating shaft 221 and is connected to the corresponding arc-shaped flap 25 of the second rotating shaft 221.

[0073] The first rotating shafts 211 are circumferentially and uniformly distributed along the outer wall of the moving ring 21, and the number is the same as that of the support rods 24 and the arc-shaped flaps 25, usually 6 - 10. A first hole is provided on each first rotating shaft 211, and the axis of the first hole is perpendicular to the axis of the moving ring 21, ensuring that the support rod 24 can rotate around the axis of the moving ring 21. The shape of the first hole is usually circular, and the hole diameter is slightly larger than the diameter of the first end of the support rod 24 to ensure that the support rod 24 is connected to the moving ring 21 through the first hole. The size of the hole diameter needs to be determined according to the diameter of the support rod 24 and the required range of motion.

[0074] The second rotating shafts 221 are circumferentially and uniformly distributed along the outer wall of the fixed ring 22, corresponding one-to-one with the first rotating shafts 211, usually 6 - 10. A second hole is provided on each second rotating shaft 221, and the axis of the second hole is also perpendicular to the axis of the injection-production pipe 10. The shape and size of the second hole are similar to those of the first hole, being circular, and the hole diameter is slightly larger than the diameter of the second end of the support rod 24. In addition, the second hole is a through hole to ensure that the second end of the support rod 24 can pass through the second hole and be connected to the arc-shaped flap 25.

[0075] The first end of the support rod 24 is inserted into the first hole of the first rotating shaft 211 and fixed by a connecting member such as a pin or a bolt, allowing the support rod 24 to rotate around the axis of the first hole. This connection method is similar to a hinge connection, enabling the support rod 24 to rotate accordingly when the moving ring 21 rotates. The second end of the support rod 24 passes through the second hole of the second rotating shaft 221 and is connected to the corresponding arc-shaped flap 25 of the second rotating shaft 221. The connection method can be welding, bolt connection, or other mechanical connection methods to ensure that the support rod 24 can transmit the rotational motion of the moving ring 21 to the arc-shaped flap 25, driving the arc-shaped flap 25 to open and close.

[0076] When the driving device drives the moving ring 21 to rotate unidirectionally around the axis of the injection-production pipe 10, the first rotating shaft 211 on the moving ring 21 also rotates accordingly. Since the first end of the support rod 24 is connected to the first rotating shaft 211 and the second end is connected to the second rotating shaft 221, the rotational movement of the moving ring 21 will be transmitted to the second rotating shaft 221 on the fixed ring 22 through the support rod 24. At this time, the support rod 24 will tilt due to the rotation of the moving ring 21, thereby driving the arc-shaped flap 25 connected thereto to rotate around the axis of the second rotating shaft 221, realizing the unfolding of the arc-shaped flap 25. In one embodiment, during the unfolding process, the moving ring 21 rotates counterclockwise (assuming the driving direction is counterclockwise), and the support rod 24 gradually tilts, driving the arc-shaped flap 25 to gradually unfold from the closed state (vertical state and circularly stacked and pressed) to the umbrella-shaped open state.

[0077] In the above embodiment, through the design of the first hole and the second hole, the support rod 24 can rotate flexibly around the first rotating shaft 211 and the second rotating shaft 221, thereby realizing the opening and closing movement of the arc-shaped flap 25, being able to convert the rotational movement of the moving ring 21 into the tilting movement of the support rod 24, and further driving the opening and closing of the arc-shaped flap 25, ensuring the flexibility and accuracy of the movement.

[0078] In some embodiments of this specification, the driving device may include a driving member and a limiting mechanism. The driving member is used to drive the moving ring 21 to rotate around the axis of the injection-production pipe 10 in the first direction after the injection-production pipe 10 enters the salt cavern. The first direction is the clockwise direction or the counterclockwise direction. The limiting mechanism is used to limit the moving ring 21 after the driving member drives the moving ring 21 to rotate, so as to prevent the moving ring 21 from rotating around the axis of the injection-production pipe 10 in the second direction. The second direction is opposite to the first direction.

[0079] The driving member is used to provide power to make the moving ring 21 rotate unidirectionally (clockwise or counterclockwise), and common forms include a spring driving member 236 and a pressure tank 238. The limiting mechanism ensures that the position of the moving ring 21 is locked after rotation, preventing reverse rotation from causing structural failure, and common forms include a ratchet mechanism and a buckle mechanism. Through the above method, reliable unidirectional driving and precise limiting of the deformable suction pipe orifice 20 are achieved, and its automatic triggering and maintenance-free characteristics significantly improve the intelligent level and operation stability of the salt cavern energy storage system. Without external energy dependence, it adapts to the humid and high-pressure environment of the salt cavern, has a simple structure, and significantly improves reliability.

[0080] As Figure 2 and Figure 5 shown, in some embodiments of this specification, the limiting mechanism may include a ratchet mechanism. The ratchet mechanism is located between the moving ring 21 and the outer wall of the injection-production pipe 10. As Figure 5As shown, the ratchet mechanism may include a ratchet wheel 231 and a pawl 232. The ratchet wheel 231 is arranged around the outer wall of the injection-production pipe 10 and can rotate around the axis of the injection-production pipe 10. One end of the pawl 232 is rotatably installed on the inner wall of the moving ring 21, and the other end of the pawl 232 is in contact with the gear of the ratchet wheel 231. The driving member may include a spring driving member 236. Please refer to Figure 4 , which shows a schematic diagram of the spring driving member 236. As Figure 4 shown, the spring driving member 236 is arranged around the outer wall of the injection-production pipe 10. One end of the spring driving member 236 is fixedly connected to the outer wall of the injection-production pipe 10, and the other end of the spring driving member 236 is fixedly connected to the inner side of the ratchet wheel 231. During the process of the injection-production pipe 10 being lowered into the well, the spring driving member 236 is in a deformed state. After the injection-production pipe 10 enters the salt cavern, when the spring driving member 236 returns to its original length, it drives the ratchet wheel 231 to rotate around the axis of the injection-production pipe 10, so that the moving ring 21 rotates around the axis of the injection-production pipe 10 under the action of the pawl 232, and then drives a plurality of support rods 24 to tilt, so that a plurality of arc-shaped petals 25 are in an umbrella-shaped open state.

[0081] As Figure 5 shown, the ratchet mechanism may further include a spring 233. The ratchet wheel 231 can rotate around a fixed axis. One end of the spring 233 is connected to the fixed axis, and the other end of the spring 233 is connected to the pawl 232. The spring 233 is used to enable the pawl 232 to rotate around the fixed axis only within a certain angle range.

[0082] The ratchet mechanism is located between the moving ring 21 and the outer wall of the injection-production pipe 10. This layout makes the structure compact and can make full use of the space around the injection-production pipe 10. The ratchet wheel 231 is arranged around the outer wall of the injection-production pipe 10 and can rotate around the axis of the injection-production pipe 10. The ratchet wheel 231 is usually made of high-strength metal materials such as stainless steel to ensure that it will not be deformed or damaged during long-term use. The tooth profile design of the ratchet wheel 231 should meet the requirements of good cooperation with the pawl 232. One end of the pawl 232 is rotatably installed on the inner wall of the moving ring 21, and the other end is in contact with the gear of the ratchet wheel 231. The material of the pawl 232 can also be selected as high-strength metal, and the surface is quenched to enhance wear resistance.

[0083] The driving member can be a spring driving member 236, and the spring driving member 236 can be a shape memory alloy spring driving member 236 (such as NiTi alloy). The spring driving member 236 surrounds the outer wall of the injection-production pipe 10, with one end fixed to the injection-production pipe 10 and the other end connected to the inner side of the ratchet wheel 231. During the process of lowering the pipe into the well, the spring driving member 236 is compressed (or stretched) to a deformed state, and the ratchet wheel 231 remains stationary under the force of the spring driving member 236, and the moving ring 21 is in the initial position. The support rod 24 is vertical, and the arc-shaped flaps 25 are closed to reduce the resistance during the process of lowering the pipe into the well. When the ambient temperature is greater than or equal to the preset temperature, the memory effect of the spring driving member 236 is triggered, and it returns to its original length to drive the ratchet wheel 231 to rotate counterclockwise or clockwise. The rotation of the ratchet wheel 231 drives the moving ring 21 to rotate synchronously, and the pawl 232 engages into the tooth groove of the ratchet wheel 231 to prevent reverse movement. After the deformable suction pipe orifice 20 is opened, the ratchet mechanism maintains the position of the moving ring 21 to resist the gravity, the air flow backwash force or the pressure fluctuation in the salt cavern. In this embodiment, by integrating the driving and triggering functions with the shape memory alloy spring driving member 236, the automatic triggering of the driving device can be realized, and the structure is simple. Through the precise cooperation of the ratchet wheel 231 and the pawl 232, the deviation of the transmission angle can be reduced, and the reverse rotation of the moving ring 21 resulting in the closing of the deformable suction pipe orifice 20 can also be avoided. Through the collaborative design of the shape memory alloy spring driving member 236 and the ratchet mechanism, the reliable automatic opening and precise limit of the deformable suction pipe orifice 20 are achieved, and its characteristics of being maintenance-free, high-temperature resistant and corrosion-resistant provide key technical support for the efficient and stable operation of the salt cavern energy storage system.

[0084] Please refer to Figures 6 to 8 , which shows a partial structural schematic diagram of the injection-production pipe assembly, a partial top view of the injection-production pipe assembly in the snap-locked state, and a partial top view of the injection-production pipe assembly 1 in the non-snap-locked state. As Figures 6 to 8 shown, in some embodiments of this specification, the limiting mechanism can include a snap mechanism. The snap mechanism can include a snap 234 and a slot 235. One end of the snap 234 is compressibly installed on the outer wall of the injection-production pipe 10 through an elastic member 237. The other end of the snap 234 is smoothly inclined and contacts the inner wall of the moving ring 21. The slot 235 is arranged on the inner wall of the moving ring 21. When the moving ring 21 rotates around the axis of the injection-production pipe 10 such that the snap 234 snaps into the slot 235, the moving ring 21 enters the locked state. The driving member can include a spring driving member 236. The spring driving member 236 is arranged around the outer wall of the injection-production pipe 10. One end of the spring driving member 236 is fixedly connected to the outer wall of the injection-production pipe 10, and the other end of the spring driving member 236 is fixedly connected to the inner side of the moving ring 21. During the process of lowering the injection-production pipe 10 into the well, the spring driving member 236 is in a deformed state. After the injection-production pipe 10 enters the salt cavern, when the spring driving member 236 returns to its original length, it drives the moving ring 21 to rotate around the axis of the injection-production pipe 10, and further drives a plurality of support rods 24 to incline, so that a plurality of arc-shaped flaps 25 are in an umbrella-shaped open state.

[0085] One end of the buckle 234 is installed on the outer wall of the injection-production pipe 10 in a compressible manner by means of an elastic member 237. The elastic member 237 is generally a micro spring with a certain pre-compression amount. The other end of the buckle 234 contacts the inner wall of the moving ring 21. The other end of the buckle 234 is designed to be smooth and inclined for easy movement. The material of the buckle 234 can be selected as aluminum alloy to achieve lightweight, or titanium alloy to ensure high strength. The card slot 235 is arranged on the inner wall of the moving ring 21. For example, the number of card slots 235 can be set to 3-4. The size and shape of the card slot 235 should be adapted to the buckle 234 to ensure that the buckle 234 can smoothly snap in and achieve stable locking.

[0086] The spring drive member 236 as the driving member is arranged around the outer wall of the injection-production pipe 10, with one end fixedly connected to the outer wall of the injection-production pipe 10 and the other end fixedly connected to the inner side of the moving ring 21. The spring drive member 236 usually adopts a shape memory alloy, such as NiTi alloy, which has a specific phase change temperature range, generally at 25°C ± 5°C.

[0087] During the process of the injection-production pipe 10 being lowered into the well, the spring drive member 236 is in a deformed state (stretched or compressed), and the moving ring 21 is in the initial position. At this time, the buckle 234 contacts the inner wall of the moving ring 21 under the action of the elastic member 237. Since the moving ring 21 does not rotate, the buckle 234 does not snap into the card slot 235, and the moving ring 21 can move freely (as Figure 8 shown). At the same time, a plurality of support rods 24 are in the vertical state, and a plurality of arc-shaped flaps 25 are also in the vertical and cyclic overlapping state to reduce the resistance during well lowering.

[0088] When the injection-production pipe 10 enters the salt cavern, the ambient temperature reaches the phase change temperature of the spring drive member 236, and the memory effect of the spring drive member 236 is triggered, and it starts to recover its original length. During the process of the spring drive member 236 recovering its original length, it drives the moving ring 21 to rotate around the axis of the injection-production pipe 10.

[0089] As the moving ring 21 rotates, when the buckle 234 rotates to a position opposite to the card slot 235, under the elastic force of the elastic member 237, the buckle 234 will smoothly slide into the card slot 235 (as Figure 7 shown). Once the buckle 234 snaps into the card slot 235, the moving ring 21 enters the locked state and cannot rotate in the reverse direction, thus ensuring that a plurality of support rods 24 remain in the inclined state and a plurality of arc-shaped flaps 25 maintain the umbrella-shaped open state.

[0090] The snap mechanism can automatically lock according to the rotation position of the moving ring 21 without the need for an additional control device. When the moving ring 21 rotates to a specific position, the snap 234 will accurately snap into the card slot 235 under the action of the elastic member 237, ensuring the timeliness and accuracy of locking. The smooth inclined end design of the snap 234 reduces the frictional resistance when contacting the inner wall of the moving ring 21. This makes the rotation of the moving ring 21 smoother, reduces energy loss, and improves the transmission efficiency of the system. The reliable locking function of the snap mechanism avoids the accidental reverse rotation of the moving ring 21, ensures that the deformable suction nozzle 20 is always in a stable open state, and improves the reliability of the entire injection-production pipe assembly 1. The limiting system has a simple structure, does not require complex transmission devices and control circuits, reduces the manufacturing cost and installation difficulty of the system. Using the shape memory alloy spring driver 236 as the driver can automatically trigger the rotation of the moving ring 21 according to the temperature change in the salt cavern without external energy supply. At the same time, the snap mechanism and the spring driver 236 can work normally within a wide temperature range, adapting to the harsh environmental conditions in the salt cavern.

[0091] In some embodiments of the present specification, such as Figure 2 and Figure 5 shown, the limiting mechanism may include a ratchet mechanism, and the ratchet mechanism is located between the outer wall of the moving ring 21 and the injection-production pipe 10. As Figure 5 shown, the ratchet mechanism may include a ratchet 231 and a pawl 232. The ratchet 231 is arranged around the outer wall of the injection-production pipe 10 and can rotate unidirectionally around the axis of the injection-production pipe 10. One end of the pawl 232 is rotatably installed on the inner wall of the moving ring 21, and the other end of the pawl 232 is in contact with the gear of the ratchet 231. The driver may include a pressure tank assembly. Please refer to Figure 9 , which shows a schematic structural diagram of a pressure tank-driven injection-production pipe assembly in an embodiment of the present specification. As Figure 9 shown, the pressure tank 238 assembly includes a pressure tank 238 and a transmission mechanism 239. The pressure tank 238 is arranged on the outer wall of the injection-production pipe 10 between the moving ring 21 and the fixed ring 22. High-pressure gas is contained in the pressure tank 238. One end of the transmission mechanism 239 is connected to the pressure tank 238, and the other end of the transmission mechanism 239 is connected to the ratchet 231. During the process of the injection-production pipe 10 being lowered into the well, the pressure tank 238 assembly is in a locked state. After the injection-production pipe 10 enters the salt cavern, the pressure tank 238 is unlocked, and the high-pressure gas in the pressure tank 238 releases pressure to drive the transmission mechanism 239 to drive the ratchet 231 to rotate around the axis of the injection-production pipe 10, so that the moving ring 21 rotates around the axis of the injection-production pipe 10 under the action of the pawl 232, and then drives a plurality of support rods 24 to incline, so that a plurality of arc-shaped petals 25 are in an umbrella-shaped open state.

[0092] In one embodiment, a signal line may be provided on the injection-production pipe 10. After the injection-production pipe 10 enters the salt cavern, the signal line sends a signal to the electric switch of the pressure tank 238 to unlock the pressure tank 238. In another embodiment, a timer may be provided on the pressure tank 238. After the timer times out, the pressure tank 238 is automatically unlocked.

[0093] The ratchet mechanism is located between the moving ring 21 and the outer wall of the injection-production pipe 10. This layout makes the structure compact and can make full use of the space around the injection-production pipe 10. The ratchet 231 is arranged around the outer wall of the injection-production pipe 10 and can rotate around the axis of the injection-production pipe 10. The ratchet 231 is usually made of high-strength metal materials such as stainless steel to ensure that it will not be deformed or damaged during long-term use. The tooth profile design of the ratchet 231 should meet the requirement of good cooperation with the pawl 232. One end of the pawl 232 is rotatably installed on the inner wall of the moving ring 21, and the other end is in contact with the gear of the ratchet 231. The material of the pawl 232 can also be selected as high-strength metal and its surface is quenched to enhance wear resistance.

[0094] As Figure 5 shown, the ratchet mechanism may further include a spring 233. The ratchet 231 can rotate around a fixed axis. One end of the spring 233 is connected to the fixed axis, and the other end of the spring 233 is connected to the pawl 232. The spring 233 is used to make the pawl 232 rotate around the fixed axis only within a certain angle range.

[0095] The pressure tank 238 is the power source for driving the rotation of the moving ring 21. High-pressure gas is stored in the pressure tank 238, and the air pressure of the high-pressure gas in the pressure tank is higher than the air pressure in the salt cavern. The pressure difference inside and outside the pressure tank 238 is used to provide the driving force. The volume of the pressure tank 238 is designed according to the pressure of the salt cavern and the magnitude of the required driving force. The pressure tank 238 generally adopts a structure of carbon steel lined with rubber to ensure its pressure resistance and corrosion resistance. During the process of lowering the injection-production pipe 10 into the well, the pressure tank 238 is in a closed state, the moving ring 21 is in the initial position, and the ratchet 231 and the pawl 232 are relatively stationary. At this time, multiple support rods 24 are in a vertical state, and multiple arc-shaped flaps 25 are also in a vertical and circularly stacked and pressed state to reduce the resistance during well lowering. When the injection-production pipe 10 enters the salt cavern, the valve of the pressure tank 238 is opened, and the pressure difference inside and outside the pressure tank 238 causes the high-pressure gas in the pressure tank 238 to push transmission mechanisms such as pistons or turbines through pipelines. These transmission mechanisms 239 transmit the power to the ratchet 231, driving the ratchet 231 to rotate around the axis of the injection-production pipe 10. Since one end of the pawl 232 is installed on the inner wall of the moving ring 21, the rotation of the ratchet 231 will drive the moving ring 21 to rotate through the pawl 232. During the rotation of the moving ring 21, the pawl 232 slides on the tooth surface of the ratchet 231. When the moving ring 21 rotates to a predetermined position, the pawl 232 will engage into the tooth groove of the ratchet 231, preventing the ratchet 231 from rotating in the reverse direction, thereby locking the moving ring 21 in the current position. In this way, multiple support rods 24 are kept in an inclined state, and multiple arc-shaped flaps 25 maintain an umbrella-shaped open state.

[0096] In the above embodiment, the pressure difference inside and outside the pressure tank 238 is used as the power source, without the need for additional energy supply, improving the energy utilization efficiency. At the same time, the design of the pressure tank 238 can adjust the magnitude of the driving force according to actual needs to meet the requirements under different working conditions. The cooperation of the ratchet 231 and the pawl 232 realizes a reliable one-way transmission function. The precise meshing of the pawl 232 and the ratchet 231 can effectively prevent the moving ring 21 from rotating in the reverse direction, ensuring the stable open state of the deformable suction nozzle 20.

[0097] In some embodiments of this specification, such as Figures 6 to 8 shown, the limiting mechanism may include a snap mechanism, and the snap mechanism may include a snap 234 and a slot 235. One end of the snap 234 is compressibly installed on the outer wall of the injection-production pipe 10 through an elastic member 237, and the other end of the snap 234 is smoothly inclined and in contact with the inner wall of the moving ring 21. The slot 235 is arranged on the inner wall of the moving ring 21. When the moving ring 21 rotates around the axis of the injection-production pipe 10 such that the snap 234 snaps into the slot 235, the moving ring 21 enters the locked state. The driving member may include a pressure tank assembly. Please refer to Figure 9 which shows a schematic structural diagram of the injection-production pipe assembly driven by a pressure tank in an embodiment of this specification. As Figure 9As shown, the pressure tank 238 assembly includes a pressure tank 238 and a transmission mechanism 239. The pressure tank 238 is disposed on the outer wall of the injection-production pipe 10 between the moving ring 21 and the fixed ring 22. High-pressure gas is contained in the pressure tank 238. One end of the transmission mechanism 239 is connected to the pressure tank 238, and the other end of the transmission mechanism 239 is connected to the moving ring 21. During the process of the injection-production pipe 10 being lowered into the well, the pressure tank 238 assembly is in a locked state. After the injection-production pipe 10 enters the salt cavern, the pressure tank 238 is unlocked, and the high-pressure gas in the pressure tank 238 releases pressure to drive the transmission mechanism 239 to drive the moving ring 21 to rotate around the axis of the injection-production pipe 10, thereby driving a plurality of support rods 24 to incline, so that a plurality of arc-shaped flaps 25 are in an umbrella-shaped open state.

[0098] In one embodiment, a signal line may be provided on the injection-production pipe 10. After the injection-production pipe 10 enters the salt cavern, the signal line sends a signal to the electric switch of the pressure tank 238 to unlock the pressure tank 238. In another embodiment, a timer may be provided on the pressure tank 238, and after the timer times out, the pressure tank 238 is automatically unlocked.

[0099] One end of the buckle 234 is installed on the outer wall of the injection-production pipe 10 in a compressible manner by means of an elastic member 237. As Figure 7 and Figure 8 shown, the elastic member 237 is generally a micro spring and has a certain pre-compression amount. The other end of the buckle 234 contacts the inner wall of the moving ring 21. The other end of the buckle 234 is designed to be smoothly inclined to facilitate its movement. The material of the buckle 234 can be selected as aluminum alloy to achieve light weight, or titanium alloy to ensure high strength. The card slot 235 is provided on the inner wall of the moving ring 21. For example, the number of card slots 235 can be set to 3-4. The size and shape of the card slot 235 should be adapted to the buckle 234 to ensure that the buckle 234 can be smoothly snapped in and achieve stable locking.

[0100] The pressure tank 238 is the power source for driving the rotation of the moving ring 21. High-pressure gas is stored in the pressure tank 238, and the air pressure of the high-pressure gas in the pressure tank is higher than the air pressure in the salt cavern. The pressure difference inside and outside the pressure tank 238 is used to provide the driving force. The volume of the pressure tank 238 is designed according to the pressure of the salt cavern and the magnitude of the required driving force. The pressure tank 238 generally adopts a structure of carbon steel lined with rubber to ensure its pressure resistance and corrosion resistance.

[0101] During the process of the injection-production pipe 10 being lowered into the well, the pressure tank 238 is in a closed state, the moving ring 21 is in the initial position, and the buckle 234 contacts the inner wall of the moving ring 21 but is not locked (as Figure 8As shown. At this time, multiple support rods 24 are in a vertical state, and multiple arc-shaped flaps 25 are also in a vertical and circularly stacked and pressed state to reduce the resistance during downhole operation. When the injection-production pipe 10 enters the salt cavern, the valve of the pressure tank 238 is opened, and the pressure difference inside and outside the pressure tank 238 causes the high-pressure gas inside the pressure tank 238 to push a transmission mechanism 239 such as a piston or a turbine through a pipeline. These transmission mechanisms 239 transmit power to the moving ring 21, driving the moving ring 21 to rotate. During the rotation of the moving ring 21, when the moving ring 21 rotates to align the buckle 234 with the card slot 235, the elastic member 237 drives the buckle 234 to snap into the card slot 235, causing the moving ring 21 to be in a locked state (as Figure 7 shown). After locking, the moving ring 21 cannot rotate in the reverse direction, and multiple support rods 24 remain in an inclined state, and multiple arc-shaped flaps 25 maintain an umbrella-shaped open state.

[0102] In the above embodiment, it is directly driven by the pressure difference of the pressure tank 238 without external energy, and the buckle mechanism realizes pure mechanical automatic locking. Through the collaborative design of the pressure tank assembly and the buckle mechanism, the efficient drive and reliable locking of the deformable suction nozzle 20 are achieved. Its high driving force, fast response and maintenance-free characteristics provide important technical support for the large-scale application of the salt cavern energy storage system.

[0103] In some embodiments of this specification, the included angle of the arc-shaped flap 25 is 36° to 60°. The included angle is the central angle of a single arc-shaped flap 25 around the axis of the injection-production pipe 10. Setting the included angle to 36° - 60° enables the airflow to flow along the arc surface, reduces the separation point, and lowers the turbulence intensity. An overly large included angle will result in insufficient rigidity of the flap body, while an overly small included angle will increase the overlap degree of adjacent flaps. An overly large overlap degree will cause an excessive thickness, thus requiring a larger injection-production well.

[0104] In some embodiments of this specification, the ratio of the flap length of the arc-shaped flap 25 to the diameter of the injection-production pipe 10 is 0.8 to 1.5. The flap length of the arc-shaped flap 25 refers to the length extending from the outer wall of the injection-production pipe 10 to the end, that is, the length of the arc-shaped flap 25 in the vertical direction. When the flap length is greater than 1.5 times the pipe diameter, the deflection at the end is too large, affecting the sealing performance; while when the flap length is less than 0.8 times, the suction area is small, affecting the suction efficiency and the rectification effect. Therefore, by setting the ratio of the flap length of the arc-shaped flap 25 to the diameter of the injection-production pipe 10 to be 0.8 to 1.5, a larger unfolded area and sealing performance of the deformable suction nozzle 20 can be ensured.

[0105] In some embodiments of this specification, the number of arc-shaped flaps 25 is 6 to 10. By setting the number of arc-shaped flaps 25 to be 6 to 10, on the one hand, it can avoid excessive complexity and high cost caused by a large number, and on the other hand, it can avoid a decrease in sealing performance caused by too few numbers.

[0106] In some embodiments of this specification, the arc-shaped flap 25 is made of metal. By setting the arc-shaped flap 25 as a metal arc-shaped flap 25, the service life of the arc plate can be extended, and it can also adapt to the high-temperature and high-pressure environment of the salt cavern.

[0107] In some embodiments of this specification, when multiple arc-shaped flaps 25 are in an umbrella-shaped open state, the opening radius is:

[0108]

[0109] where r is the opening radius when multiple arc-shaped flaps 25 are in an umbrella-shaped open state, Q is the exhaust volume of the air intake of the injection-production pipe 10, and v is the air flow velocity at the air intake. This formula provides a theoretical basis for the design of the deformable suction pipe orifice 20, and realizes the optimal balance between suction efficiency and particle protection through parametric calculation, laying a foundation for the efficient and stable operation of the salt cavern energy storage system.

[0110] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments. Specifically, reference can be made to the description of the relevant processing related embodiments above, and details will not be repeated here.

[0111] The above method will be described below in conjunction with a specific embodiment. However, it should be noted that this specific embodiment is only for better explaining this specification and does not constitute an improper limitation to this specification.

[0112] In this specific embodiment, an injection-production pipe assembly 1 for salt cavern compressed air energy storage is provided. As Figure 2As shown, the injection and production pipe assembly 1 in this specific embodiment may include a filter screen 30, a metal arc petal 25, a fixed ring 22, a dynamic ring 21, a ratchet 231, a support rod 24, and a rotating shaft. The number of metal arc petals 25 is 6-10 petals, which is determined by the diameter of the pipeline. The wrap angle of a single metal arc petal 25 is 36° to 60°, and the petal length is equal to the diameter of the pipeline. A rotating shaft is provided on both the fixed ring 22 and the dynamic ring 21. There is a hole in the rotating shaft, and the support rod 24 passes through the hole to connect with the fixed ring 22 and the dynamic ring 21. During the process of the injection and production pipe 10 going down the well, the support rod 24 is vertical, so that the deformable suction pipe mouth 20 is in a retracted state. When the pipeline enters the salt cavern, the fixed ring 22 does not move, and there is a spring drive member 236 structure on the outside of the injection and production pipe 10 inside the ratchet 231. The spring drive member 236 is in an extended state when it is fixed. The spring drive member 236 is made of shape memory alloy material. After the injection and production pipe 10 is lowered into the well, the spring drive 236 gradually returns to its original length due to the memory effect of the alloy. In the process of the spring drive 236 returning to its original length, the ratchet 231 is driven to rotate, and the movable ring 21 rotates around the outside of the injection and production pipe 10. The rotating shaft on the movable ring 21 is also driven to rotate while the rotating shaft on the fixed ring 22 is rotated, so that the support rod 24 is tilted at a certain angle, and the deformable suction pipe port 20 is opened. The filter 30 can filter out larger solid particles, slag and impurities in the air to ensure that the air enters the pipeline smoothly.

[0113] Figure 3 Schematic diagram of the retracted state of the deformable suction nozzle 20. In the retracted state, the metal arc petals 25 are in a cyclic stacking state, that is, the No. 1 arc petal 25 is stacked by the No. 2 arc petal 25, the No. 2 arc petal 25 is stacked by the No. 3 arc petal 25, and the last arc petal 25 is stacked by the No. 1 arc petal 25.

[0114] like Figure 5 As shown, the injection and production tube assembly 1 may include an injection and production tube, a moving ring 21, a ratchet 231, a pawl 232 and a spring 233. When the ratchet 231 rotates clockwise, the pawl 232 rotates around the fixed axis, and the spring 233 is compressed. As the ratchet 231 rotates, the spring 233 returns to its original state, and the moving ring 21 does not rotate. One end of the spring 233 is connected to the fixed axis, and the other end of the spring 233 is connected to the pawl 232. The spring 233 is used to enable the pawl 232 to rotate within a certain angle range. When the ratchet 231 rotates counterclockwise, the moving ring 21 is pushed to rotate under the action of the buckle 234, so that the support rod 24 drives the deformable suction pipe mouth 20 to open.

[0115] In this specific embodiment, the deformable intake nozzle 20 is adopted, which improves the stability of air flow, effectively reduces the deposition of impurities during the air compression process, and enhances the reliability of the system. Through the combination of the support rod 24, the fixed ring 22, the moving ring 21, the ratchet 231, the rotating shaft and the spring drive 236, the automatic opening and closing of the deformable intake nozzle 20 is realized. The filter screen 30 can efficiently remove various solid particles in the air, especially slag impurities, through filtration, avoiding damage to the generator set by the compressed air.

[0116] During specific implementation, the deformable intake nozzle 20 can be designed with different sizes according to the scale of the system and the required air flow rate to ensure smooth air entry into the pipeline. When the spring drive 236 returns to its original length, it can push the ratchet 231 to rotate counterclockwise unidirectionally. While the ratchet 231 rotates, it drives the moving ring 21 to rotate around the outer side of the injection-production pipe 10, causing the support rod 24 to tilt at a certain angle, realizing the opening of the deformable intake nozzle 20.

[0117] In actual engineering, for the gas production operation situation, it is necessary to control the size of the inlet air intake. By adjusting the opening angle of the circular deformable intake nozzle 20, the inlet gas intake can be controlled. When mainly considering the effective suction range of the suction port, and assuming the exhaust gas volume of the suction port is Q (unit: m 3 / s) and the suction port speed is v (unit: m / s), then the opening radius r of the suction port can be calculated according to the following empirical formula:

[0118]

[0119] The deformable intake nozzle 20 is located at the air inlet end of the slag filtration device. Its function is to have a reasonably designed umbrella shape that can contract and open, improve the air flow rate and accelerate the introduction of air, so that the air has a lower pressure when entering the system, thereby reducing the slag deposition and equipment wear caused by unstable air flow. The inner wall of the suction port is made of wear-resistant material to reduce the friction and damage of slag particles to the pipeline. When the pipeline enters the salt cavern, the spring drive 236 drives the ratchet 231 to drive the moving ring 21 to rotate around the outer edge of the injection-production pipe 10. While the moving ring 21 rotates, it drives the rotating shaft above it to rotate, causing the support rod 24 to tilt at a certain angle, and the deformable intake nozzle 20 is opened.

[0120] It should be understood that the above description is for illustrative purposes and not for limitation. By reading the above description, many embodiments and many applications other than the provided examples will be obvious to those skilled in the art. Therefore, the scope of this specification should not be determined by the above description, but should be determined by the foregoing claims and the full scope of the equivalents of these claims.

[0121] The above are only the preferred embodiments of this specification and are not intended to limit this specification. For those skilled in the art, various changes and modifications can be made to the embodiments of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included within the protection scope of this specification.

Claims

1. An injection and production pipe assembly for compressed air energy storage in salt caverns, characterized in that: It comprises an injection-production pipe and a deformable suction pipe opening, wherein the deformable suction pipe opening is arranged around the outer wall of the injection-production pipe and close to the air inlet of the injection-production pipe; the deformable suction pipe opening comprises a moving ring, a fixed ring, a driving device, a plurality of support rods and a plurality of circular arc petals; the deformable suction pipe opening can extend into the salt cavern through the injection-production well; The moving ring can rotate unidirectionally around the axis of the injection and production tube under the drive of the driving device; a plurality of first rotating shafts are circumferentially arranged on the outer wall of the moving ring; the fixed ring is located below the moving ring, the inner wall of the fixed ring is fixedly connected to the outer wall of the injection and production tube, and a plurality of second rotating shafts are circumferentially arranged on the outer wall of the fixed ring; the plurality of support rods correspond to the plurality of first rotating shafts and the plurality of second rotating shafts respectively, and the support rods are used to connect the corresponding first rotating shafts and the corresponding second rotating shafts; the plurality of circular arc petals correspond to the plurality of second rotating shafts one by one, and the circular arc petals are connected to the corresponding second rotating shafts; the upper ends of the plurality of circular arc petals are arranged around the outer wall of the injection and production tube, and the lower parts of the plurality of circular arc petals are located below the air inlet; During the process of lowering the injection and production pipe into the well, the multiple support rods are in a vertical state, and the multiple arc petals are in a vertical state and in a cyclically stacked state; after the air inlet of the injection and production pipe enters the salt cavern, the driving device is used to drive the moving ring to rotate unidirectionally around the axis of the injection and production pipe, driving the multiple support rods to tilt, so that the multiple arc petals are in an umbrella-shaped open state.

2. The injection and production pipe assembly for compressed air energy storage in salt caverns according to claim 1, characterized in that: The injection and production pipe assembly also includes: A filter screen is arranged in the injection and production pipe and close to the air inlet of the injection and production pipe, and is used for filtering the gas flowing into the injection and production pipe.

3. The injection and production pipe assembly for compressed air energy storage in salt caverns according to claim 1, characterized in that: The first rotating shaft is provided with a first hole; the second rotating shaft is provided with a second hole; The first end of the support rod is connected to the corresponding first rotating shaft via the first hole, and the second end of the support rod is connected to the corresponding second rotating shaft via the second hole; The second end of the support rod passes through the corresponding second hole of the second rotating shaft and is connected to the arc petal corresponding to the second rotating shaft.

4. The injection and production pipe assembly for compressed air energy storage in salt caverns according to claim 1, characterized in that: The driving device comprises: A driving member, wherein the driving member is used to drive the movable ring to rotate along a first direction around the axis of the injection and production pipe after the injection and production pipe enters the salt cavern; the first direction is a clockwise direction or a counterclockwise direction; A limiting mechanism is used to limit the moving ring after the driving member drives the moving ring to rotate, so as to prevent the moving ring from rotating along the second direction around the axis of the injection and production tube; the second direction is opposite to the first direction.

5. The injection and production pipe assembly for compressed air energy storage in salt caverns according to claim 4, characterized in that: The limiting mechanism includes a ratchet mechanism, which is located between the moving ring and the outer wall of the injection and production tube; the ratchet mechanism includes a ratchet and a pawl; the ratchet is arranged around the outer wall of the injection and production tube and can rotate around the axis of the injection and production tube; one end of the pawl is rotatably mounted on the inner wall of the moving ring, and the other end of the pawl is arranged in contact with the gear of the ratchet; The driving member includes a spring driving member, which is arranged around the outer wall of the injection and production tube, one end of the spring driving member is fixedly connected to the outer wall of the injection and production tube, and the other end of the spring driving member is fixedly connected to the inner side of the ratchet; during the injection and production tube lowering process, the spring driving member is in a deformed state; after the injection and production tube enters the salt cavern, the spring driving member restores its original length and drives the ratchet to rotate around the axis of the injection and production tube, so that the moving ring rotates around the axis of the injection and production tube under the action of the ratchet, thereby driving the multiple support rods to tilt, so that the multiple arc petals are in an umbrella-shaped open state.

6. The injection and production pipe assembly for compressed air energy storage in salt caverns according to claim 4, characterized in that: The limiting mechanism includes a buckle mechanism, which includes a buckle and a slot; one end of the buckle is compressibly mounted on the outer wall of the injection and production tube through an elastic member, and the other end of the buckle is smoothly inclined and contacts the inner wall of the dynamic ring; the slot is arranged on the inner wall of the dynamic ring; when the dynamic ring rotates around the axis of the injection and production tube so that the buckle pops into the slot, the dynamic ring enters a locked state; The driving member includes a spring driving member, which is arranged around the outer wall of the injection and production pipe, one end of the spring driving member is fixedly connected to the outer wall of the injection and production pipe, and the other end of the spring driving member is fixedly connected to the inner side of the dynamic ring; during the injection and production pipe going down the well, the spring driving member is in a deformed state; after the injection and production pipe enters the salt cavern, the spring driving member restores its original length and drives the dynamic ring to rotate around the axis of the injection and production pipe, thereby driving the multiple support rods to tilt, so that the multiple arc petals are in an umbrella-shaped open state.

7. The injection and production pipe assembly for compressed air energy storage in salt caverns according to claim 4, characterized in that: The limiting mechanism includes a ratchet mechanism, which is located between the moving ring and the outer wall of the injection and production tube; the ratchet mechanism includes a ratchet and a pawl; the ratchet is arranged around the outer wall of the injection and production tube and can rotate unidirectionally around the axis of the injection and production tube; one end of the pawl is rotatably mounted on the inner wall of the moving ring, and the other end of the pawl is arranged in contact with the gear of the ratchet; The driving member includes a pressure tank assembly, which includes a pressure tank and a transmission mechanism; the pressure tank is arranged on the outer wall of the injection and production pipe between the dynamic ring and the fixed ring; the pressure tank contains high-pressure gas; one end of the transmission mechanism is connected to the pressure tank, and the other end of the transmission mechanism is connected to the ratchet; during the injection and production pipe going down the well, the pressure tank assembly is in a locked state; after the injection and production pipe enters the salt cavern, the pressure tank is unlocked, and the high-pressure gas in the pressure tank releases pressure to drive the transmission mechanism to drive the ratchet to rotate around the axis of the injection and production pipe, so that the dynamic ring rotates around the axis of the injection and production pipe under the action of the ratchet, thereby driving the multiple support rods to tilt, so that the multiple arc petals are in an umbrella-shaped open state.

8. The injection and production pipe assembly for compressed air energy storage in salt caverns according to claim 4, characterized in that: The limiting mechanism includes a buckle mechanism, which includes a buckle and a slot; one end of the buckle is compressibly mounted on the outer wall of the injection and production tube through an elastic member, and the other end of the buckle is smoothly inclined and contacts the inner wall of the dynamic ring; the slot is arranged on the inner wall of the dynamic ring; when the dynamic ring rotates around the axis of the injection and production tube so that the buckle pops into the slot, the dynamic ring enters a locked state; The driving member includes a pressure tank assembly, which includes a pressure tank and a transmission mechanism; the pressure tank is arranged on the outer wall of the injection and production pipe between the dynamic ring and the fixed ring; the pressure tank contains high-pressure gas; one end of the transmission mechanism is connected to the pressure tank, and the other end of the transmission mechanism is connected to the dynamic ring; during the injection and production pipe going down the well, the pressure tank assembly is in a locked state; after the injection and production pipe enters the salt cavern, the pressure tank is unlocked, and the high-pressure gas in the pressure tank releases pressure to drive the transmission mechanism to drive the dynamic ring to rotate around the axis of the injection and production pipe, thereby driving the multiple support rods to tilt, so that the multiple arc petals are in an umbrella-shaped open state.

9. The injection and production pipe assembly for compressed air energy storage in salt caverns according to claim 1, characterized in that: The arc petal satisfies at least one of the following: The wrap angle of the arc petal is 36° to 60°; The ratio between the length of the circular arc petal and the diameter of the injection and production tube is 0.8 to 1.5; The number of the circular arc petals is 6 to 10; The arc petal is made of metal.

10. The injection and production pipe assembly for compressed air energy storage in salt caverns according to claim 1, characterized in that: The opening radius of the multiple circular arc petals when they are in an umbrella-shaped open state is: Among them, r is the opening radius of the multiple arc petals when they are in an umbrella-shaped open state, Q is the exhaust volume of the air intake of the injection and production pipe, and v is the air flow velocity of the air intake.

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