Tunnel inclined shaft heat storage equal-pressure compressed air energy storage system

Abstract

The invention belongs to the technical field of energy storage, and particularly relates to a tunnel inclined shaft heat storage equal-pressure compressed air energy storage system which comprises a ground water source and an underground gas storage, and the underground gas storage is connected to the ground water source through a water conveying pipeline. Comprising an air compression storage unit, an air expansion generator unit, a heat exchange device and a heat storage reservoir. A separation wall is installed in the underground gas storage, a ventilation opening is formed in the upper end of the separation wall, and a sealing plate is installed in the ventilation opening. The ground of the sub-gas reservoir is obliquely arranged, an outlet of the water conveying pipeline is located at the lower end of the ground of the sub-gas reservoir, and the outlet, in the sub-gas reservoir, of the water conveying pipeline is connected with a venturi-tube-shaped nozzle through an elastic piece; the underground gas storage is constructed by excavating the tunnel inclined shaft instead of a vertical shaft, the energy storage system equipment is installed in the inclined shaft, and meanwhile, the cleaning device is installed in the underground gas storage to clean sludge entering the underground gas storage.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and specifically relates to a tunnel inclined shaft heat storage isobaric compressed air energy storage system. Background Art

[0002] With the continuous increase of the share of new energy power generation in the power supply, its unstable characteristics such as intermittency and volatility are becoming increasingly prominent. There are phenomena of waste of resources such as wind abandonment and light abandonment in some areas, which bring problems such as peak shaving and frequency modulation to the power grid. Therefore, energy storage technology is needed to solve a series of problems brought about by the large-scale development of new energy power generation.

[0003] In energy storage technology, compressed air energy storage technology is an energy storage technology with bright prospects. It can play the role of peak shaving and valley filling, store excess electric energy during low electricity consumption periods, and release the electric energy during high electricity consumption peaks, ensuring power supply balance, reducing power loss, and thus realizing the day-night transfer of energy, which is an important guarantee for meeting the load electricity demand.

[0004] Hydrostor Company in Canada proposed an isobaric compressed air energy storage system with a reservoir and a power station built on the ground and an underground gas storage chamber. The underground gas storage chamber is excavated through a vertical shaft. After completion, a water column formed by filling it with water maintains the pressure of the underground gas storage chamber. The bottom of the vertical shaft is sealed with the underground gas storage chamber, and the vertical shaft and the underground gas storage chamber are connected through a water delivery pipeline; the ground power station and the underground gas storage chamber are connected through a high-pressure gas transmission pipeline in the vertical shaft; the disadvantages of this system are that the vertical shaft is filled with water to form a water column to maintain the pressure of the underground gas storage chamber, and the water flow rate of the water column is limited by the cross-sectional area of the water delivery pipeline connecting the vertical shaft and the underground gas storage chamber. Therefore, the vertical shaft is not well utilized. Moreover, the water delivery pipeline at the bottom of the vertical shaft is easily affected by siltation; it is difficult for personnel and large machinery to enter the underground gas storage chamber through the vertical shaft excavation, which is not conducive to later maintenance and repair. Moreover, the vertical shaft and the gas transmission pipeline therein are immersed in water for a long time, accelerating aging, increasing the failure rate, and at the same time increasing the difficulty of maintenance and repair; in addition, the layout of the heat storage device needs to be considered additionally, occupying the ground space to place the heat storage tank, or excavating the underground space to store the heat storage medium; in addition, during the long-term working process, the water source exchange between the ground reservoir and the underground gas storage space is likely to cause siltation, affecting the system efficiency and energy storage capacity, and a large amount of manpower and material resources are required for silt cleaning, and it is difficult to achieve. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art, by excavating a tunnel inclined shaft to replace the vertical shaft for the construction of an underground gas storage, and installing energy storage system equipment in the inclined shaft. At the same time, a cleaning device is installed in the underground gas storage to clean the silt entering the underground gas storage, the present invention proposes a tunnel inclined shaft heat storage isobaric compressed air energy storage system.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: The present invention relates to a tunnel inclined shaft heat storage isobaric compressed air energy storage system, which includes a ground water source and an underground gas storage tank. The underground gas storage tank is arranged in a tunnel horizontal well underground. The tunnel horizontal well is connected to the ground through a tunnel inclined shaft. The underground gas storage tank is connected to the ground water source through a water conveyance pipeline; It further includes an air compression storage unit, an air expansion power generation unit, a heat exchange device and a heat storage tank. The air compression storage unit compresses air and stores it in the underground gas storage tank. The air expansion power generation unit is used to expand and do work on the compressed air released from the underground gas storage tank to generate electric energy. The heat exchange device is used for heat exchange and cooling during air compression and heat exchange and heating during air expansion. The heat exchange working medium used in the heat exchange process of the heat exchange device is stored in the heat storage tank; An isolation wall is installed in the underground gas storage tank. An air vent is opened at the upper end of the isolation wall. A sealing plate is installed in the air vent. The sealing plate is driven by a hydraulic cylinder to move. The isolation wall divides the underground gas storage tank into multiple sub-gas storage tanks. The sub-gas storage tanks are connected to the water conveyance pipeline and the gas conveyance pipeline. The liquid level height in the sub-gas storage tank is lower than the height where the air vent is located; The ground of the sub-gas storage tank is inclined. The outlet of the water conveyance pipeline is located at the lower end of the ground of the sub-gas storage tank. A venturi tube-shaped nozzle is arranged at the outlet of the water conveyance pipeline in the sub-gas storage tank. The nozzle and the outlet of the water conveyance pipeline are connected to each other through an elastic member.

[0007] Preferably, it further includes a cleaning device. The cleaning device is installed in the underground gas storage tank. The cleaning device includes a stirring rod. Blades and swing bars are installed on the stirring rod. The stirring rod is fixedly installed on the inner wall of the underground gas storage tank through a mounting block; Multiple groups of stirring rods are arranged in the sub-gas storage tank. The stirring rods are connected and driven with each other. The blades are aligned with the outlet of the water conveyance pipeline in the sub-gas storage tank; The central line of the stirring rod is parallel to the inclined direction of the ground of the sub-gas storage tank.

[0008] Preferably, a silica gel layer is arranged on the surfaces of the stirring rod, the blades and the swing bars. The surface of the silica gel layer is subjected to a hydrophobic treatment.

[0009] Preferably, a vibration row is installed in the sub-gas storage tank. Both ends of the vibration row are respectively installed on connecting rods. The connecting rods are installed on the bottom surface of the sub-gas storage tank through brackets. The connecting rods and the brackets are movably connected.

[0010] Preferably, the brackets are installed at both ends of the connecting rods. There is relative sliding between the brackets and the connecting rods. The length direction of the vibration row is perpendicular to the outlet direction of the water conveyance pipeline.

[0011] Preferably, the swing bar includes a straight rod section and a flexible rope section.

[0012] Preferably, a retaining ring is installed on the stirring rod. The retaining rings are arranged in pairs. A sliding ring is slidably installed on the stirring rod. The swing bar is installed on the sliding ring. The sliding ring slides back and forth between the retaining rings, and there is no relative rotation between the sliding ring and the stirring rod.

[0013] Preferably, a silica gel layer is also provided on the surface of the vibration row, and elastic whiskers are provided on the silica gel layer of the vibration row.

[0014] The beneficial effects of the present invention are as follows: 1. For the isobaric compressed air energy storage system with heat storage in a tunnel inclined shaft of the present invention, by providing a tunnel inclined shaft and a tunnel horizontal shaft, it is convenient for construction machinery to enter the ground for construction and completion of the construction, and is conducive to later maintenance. At the same time, the heat storage library of the energy storage system is installed using the tunnel inclined shaft, saving the occupation of ground space, reducing construction costs, and inclining the bottom surface of the underground gas storage library, providing a cleaning device and providing a partition wall, reducing the relative area of a single sub-gas storage, and improving the cleaning effect of the silt in the sub-gas storage.

[0015] 2. For the isobaric compressed air energy storage system with heat storage in a tunnel inclined shaft of the present invention, by providing a stirring rod, a swing bar, and a vibration row, using the rotation of the swing bar in the horizontal direction and the vibration of the vibration row in the vertical direction, the silt at the inner bottom surface of the sub-gas storage is fully stirred to promote the discharge of the silt and improve the cleaning effect of the silt in the underground gas storage.

[0016] 3. For the isobaric compressed air energy storage system with heat storage in a tunnel inclined shaft of the present invention, by installing a nozzle in the shape of a Venturi tube connected by an elastic member at the outlet of the water delivery pipe, the nozzle vibrates or swings when spraying water, expanding the sweeping range and position of the water flow in the sub-gas storage and improving the cleaning effect of the silt in the underground gas storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 is a schematic structural principle diagram of the energy storage system of the present invention; Figure 2 is a schematic diagram of the tunnel inclined shaft and the tunnel horizontal shaft in the energy storage system of the present invention; Figure 3 is a schematic structural diagram of the tunnel inclined shaft and the tunnel horizontal shaft in the energy storage system of the present invention; Figure 4 is a schematic structural diagram of one of the sub-gas storages in the energy storage system of the present invention; Figure 5It is a schematic structural diagram of the stirring rod and the swing bar in the energy storage system of the present invention; Figure 6 It is a schematic structural diagram of the vibration row in the energy storage system of the present invention; Figure 7 It is Figure 3 The partial enlarged view at position A in In the figure: ground water source 1, air compression storage unit 11, air expansion power generation unit 12, heat exchange device 13, heat storage library 14, low-temperature heat storage library 141, high-temperature heat storage library 142, gas transmission pipeline 15, water transmission pipeline 16, underground gas storage 2, tunnel horizontal well 21, sub-gas storage 211, tunnel inclined well 22, isolation wall 23, ventilation opening 231, hydraulic cylinder 232, sealing plate 233, stirring rod 3, blade 31, swing bar 32, sliding ring 33, retaining ring 331, mounting block 34, vibration row 4, connecting rod 41, bracket 42. Specific embodiments

[0019] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0020] As Figures 1 to 7 shown, the present invention relates to a tunnel inclined well heat storage isobaric compressed air energy storage system, which includes a ground water source 1 and an underground gas storage 2. The underground gas storage 2 is arranged in a tunnel horizontal well 21 underground. The tunnel horizontal well 21 is connected to the ground through a tunnel inclined well 22. The underground gas storage 2 is connected to the ground water source 1 through a water transmission pipeline 16; It further includes an air compression storage unit 11, an air expansion power generation unit 12, a heat exchange device 13 and a heat storage library 14. The air compression storage unit 11 compresses air and stores it in the underground gas storage 2. The air expansion power generation unit 12 is used to expand and do work on the compressed air released from the underground gas storage 2 to generate electric energy. The heat exchange device 13 is used for heat exchange and cooling during air compression and heat exchange and heating during air expansion. The heat exchange working medium used in the heat exchange process of the heat exchange device 13 is stored in the heat storage library 14; An isolation wall 23 is installed in the underground gas storage 2. The upper end of the isolation wall 23 is provided with a ventilation opening 231. A sealing plate 233 is installed in the ventilation opening 231. The sealing plate 233 is driven to move by a hydraulic cylinder 232. The isolation wall 23 divides the underground gas storage 2 into multiple sub-gas storage 211. The sub-gas storage 211 is connected to the water transmission pipeline 16 and the gas transmission pipeline 15. The liquid level height in the sub-gas storage 211 is lower than the height where the ventilation opening 231 is located; The ground of the sub-gas storage 211 is inclined, the outlet of the water conveyance pipeline 16 is located at the lower end of the ground of the sub-gas storage 211, a nozzle in the shape of a Venturi tube is arranged at the outlet of the water conveyance pipeline 16 in the sub-gas storage 211, and the nozzle and the outlet of the water conveyance pipeline 16 are connected to each other through an elastic member; Under the control of the control center, the energy storage system operates normally and stably: During energy storage, the outside air is fully compressed into compressed air under the action of the air compression storage unit 11. At the same time, the compressed air will pass through the heat exchange device 13 for heat exchange and cooling, and the heat exchanged will be stored in the high-temperature heat storage 142 through the heat exchange working medium. Then, the compressed air will be pumped into the underground gas storage 2 through the gas transmission pipeline 15. At this time, the water existing in the underground gas storage 2 will be pressed and discharged back to the ground water source 1 through the water conveyance pipeline 16; During power generation, the compressed air in the underground gas storage 2 will pass through the heat exchange device 13 for heat exchange and temperature rise, so that the heat exchange working medium with a higher temperature in the high-temperature heat storage 142 will exchange the stored heat to the compressed air, and the heat exchange working medium with a reduced temperature will be stored in the low-temperature heat storage 141. Then, after the compressed air is heated through heat exchange, it will enter the air expansion generator set 12 to do work and generate electric energy. The air after doing work is directly discharged into the external environment. At this time, the water in the ground water source 1 will enter the underground gas storage 2 through the water conveyance pipeline 16 to maintain the relative stability of the compressed air pressure. Among them, the heat storage 14 includes a high-temperature heat storage 142 and a low-temperature heat storage 141; By excavating the tunnel inclined shaft 22, it is convenient for construction equipment to enter the ground to excavate the tunnel horizontal shaft 21, and it is also convenient for subsequent construction and treatment of the tunnel inclined shaft 22 and the tunnel horizontal shaft 21, so that the tunnel horizontal shaft 21 becomes an underground gas storage 2 capable of storing compressed air. At the same time, after the construction of the tunnel inclined shaft 22 is completed, various equipment supporting the energy storage system, such as the high-temperature heat storage 142 and the low-temperature heat storage 141, are installed in the tunnel inclined shaft 22, avoiding occupying the ground space or additionally excavating underground space, resulting in waste. At the same time, through the arranged tunnel inclined shaft 22 and the tunnel horizontal shaft 21, it is convenient for staff and construction and maintenance machinery to enter, which is beneficial to the preliminary construction and subsequent maintenance; By installing a partition wall 23 in the underground gas storage 2, the underground gas storage 2 is divided into multiple sub-gas storages 211 by the partition wall 23. During energy storage, the sealing plates 233 on each partition wall 23 are opened to connect the sub-gas storages 211 to each other, facilitating the storage of compressed air into the underground gas outlet storage. After the compressed air storage is completed, the sealing plates 233 are controlled to close the ventilation openings 231 on the partition wall 23, making the sub-gas storages 211 independent of each other. Then, during power generation, according to the power generation demand, the valves on the corresponding number of sub-gas storages 211 and the corresponding water conveyance pipelines 16 and gas conveyance pipelines 15 are opened in sequence to ensure the stable pressure and stable supply of compressed air, improving the stability and power generation efficiency of the compressed air expansion generator set 12. At the same time, through the mutual isolation of different sub-gas storages 211, when the power generation is small, the sub-gas storages 211 are prevented from being interconnected, so that the overall pressure in the underground gas storage 2 does not decrease, affecting the power generation efficiency; At the same time, since the water in the ground water source 1 will enter the underground gas storage 2 through the water conveyance pipeline 16, after the energy storage system operates for a long time, there will be silt in the underground gas storage 2, affecting the normal use of the underground gas storage 2 and reducing the capacity of the underground gas storage 2. Therefore, by setting the ground of the sub-gas storage 211 to face the outlet direction of the water conveyance pipeline 16, when the water conveyance pipeline 16 intakes and discharges water into the sub-gas storage 211, the water flow will scour the bottom surface of the sub-gas storage 211, and promote the water flow to drive the silt to move along the inclined bottom surface, so that the silt is agitated and carried out together with the water flow when the water conveyance pipeline 16 discharges water, thereby extending the dredging and maintenance cycle of the underground gas storage 2 and ensuring the normal operation of the energy storage system; At the same time, since the underground gas storage 2 is divided into multiple sub-gas storages 211, the area of each sub-gas storage 211 is relatively small. Therefore, when the water conveyance pipeline 16 intakes or discharges water into the sub-gas storage 211, the water flow can more easily scour and agitate the silt on the bottom surface of the sub-gas storage 211, thereby further improving the dredging effect of the silt in the sub-gas storage 211 and ensuring the normal operation of the sub-gas storage 211; At the same time, since each sub-gas storage 211 can be mutually closed by the partition wall 23 and the sealing plate 233, when the equipment in each sub-gas storage 211 fails and emergency repair is required, the faulty sub-gas storage 211 can be isolated by the partition wall 23, which is convenient for the staff to repair and maintain the sub-gas storage 211 when the energy storage system is operating normally, ensuring the stability of the energy storage system operation; At the same time, since a Venturi-shaped nozzle is installed at the outlet of the water conveyance pipeline 16 through an elastic member, when the water flow enters and exits the sub-gas storage 211, the nozzle will vibrate and swing, changing the direction and position of the water flow ejected from the nozzle of the water conveyance pipeline 16, further agitating the silt in the sub-gas storage 211 and improving the cleaning effect on the silt.

[0021] As an embodiment of the present invention, it further includes a cleaning device, the cleaning device is installed in the underground gas storage 2, the cleaning device includes a stirring rod 3, a blade 31 and a swinging bar 32 are installed on the stirring rod 3, and the stirring rod 3 is fixedly installed on the inner wall of the underground gas storage 2 through a mounting block 34; A plurality of groups of stirring rods 3 are arranged in the sub-gas storage 211, the stirring rods 3 are connected and driven with each other, and the blade 31 is aligned with the outlet of the water delivery pipe 16 in the sub-gas storage 211; The central line of the stirring rod 3 is parallel to the inclination direction of the ground of the sub-gas storage 211; When the water delivery pipe 16 sends water into and discharges water from the sub-gas storage 211, the water flow will impact the blade 31 on the stirring rod 3, thereby driving the stirring rod 3 to rotate, so that the stirring rod 3 drives the swinging bar 32 to rotate at a position close to the inner bottom surface of the sub-gas storage 211, stirring the silt near the inner bottom surface of the sub-gas storage 211, making the silt and the water flow mix evenly, facilitating the silt to be discharged out of the sub-gas storage 211 along with the water flow from the water delivery pipe 16, improving the cleaning effect of the silt in the sub-gas storage 211, and prolonging the maintenance and maintenance cycle of the energy storage system; At the same time, since the length of the elastic member connecting the venturi-shaped nozzle on the water delivery pipe 16 is relatively small, and the blade 31 on the stirring rod 3 is relatively close to the position of the nozzle, when the venturi-shaped nozzle swings and vibrates under the impact of the water flow, the blade 31 can still be impacted by the water flow, thereby driving the stirring rod 3 to rotate, so that the swinging bar 32 stirs the water flow and silt near the bottom surface in the sub-gas storage 211, promoting the mixture of the silt and the water flow to be discharged out of the sub-gas storage 211 from the water delivery pipe 16, improving the cleaning effect of the silt.

[0022] As an embodiment of the present invention, a silica gel layer is provided on the surfaces of the stirring rod 3, the blade 31 and the swinging bar 32, and the surface of the silica gel layer is subjected to hydrophobic treatment; By providing the silica gel layer, the contact area and contact time between the stirring rod 3, the blade 31 and the swinging bar 32 and the liquid in the sub-gas storage 211 are reduced, avoiding the corrosion of the stirring rod 3, the blade 31 and the swinging bar 32 by the liquid, which affects the normal use of the cleaning device in the sub-gas storage 211. At the same time, since the ground water source 1 is directly exposed to the external environment, the types and qualities of impurities and silt contained in the water source entering the sub-gas storage 211 from the water delivery pipe 16 in the ground water source 1 are different. Therefore, when the stirring rod 3, the blade 31 and the swinging bar 32 rotate and stir in the sub-gas storage 211, there is a possibility of colliding with silt or tiny stone particles existing in the liquid. Thus, the silica gel layer provided protects the blade 31, the stirring rod 3 and the swinging bar 32, avoiding the situation that the anti-rust paint is easily damaged and fallen during the bumping process when using the traditional anti-rust paint, which affects the protection effect of the cleaning device.

[0023] As an embodiment of the present invention, a vibration row 4 is installed in the sub-gas reservoir 211, and both ends of the vibration row 4 are respectively installed on a connecting rod 41, and the connecting rod 41 is installed on the bottom surface of the sub-gas reservoir 211 through a bracket 42, and the connecting rod 41 and the bracket 42 are movably connected; When water flows into and out of the sub-gas reservoir 211 from the water delivery pipe 16, the water flow will impact the vibration row 4 on the bottom surface of the sub-gas reservoir 211. At this time, due to the movable connection between the connecting rod 41 and the bracket 42, the vibration row 4 will vibrate under the action of the water flow, thereby further stirring the silt near the bottom surface of the sub-gas reservoir 211 through the vibration of the vibration row 4, promoting the silt to surge and mix in the water, so that the silt can be discharged from the water delivery pipe 16 together with the water flow; At the same time, since the area of ​​the water supply pipe 16 is relatively smaller than that of the sub-gas reservoir 211, the water flow discharged from the water supply pipe 16 will not completely flush the bottom surface of the sub-gas reservoir 211. At this time, the swing bar 32 on the stirring rod 3 is supplemented by the vibration row 4 to make the bottom surface of the sub-gas reservoir 211 fully covered and stirred as much as possible, so that the sludge near the bottom surface of the sub-gas reservoir 211 is stirred and cleaned, thereby improving the cleaning effect of the sludge on the bottom surface of the sub-gas reservoir 211 and extending the maintenance period of the energy storage system.

[0024] As an embodiment of the present invention, the bracket 42 is installed at both ends of the connecting rod 41, and there is relative sliding between the bracket 42 and the connecting rod 41, and the length direction of the vibration row 4 is perpendicular to the outlet direction of the water pipe 16; By setting the relative sliding between the bracket 42 and the connecting rod 41, when the vibration row 4 is impacted and driven by the water flow, the direction and amplitude of the vibration row 4 are relatively fixed, thereby ensuring the stirring effect of the vibration row 4 on the sludge near the bottom surface of the sub-gas reservoir 211, and avoiding the vibration row 4 from being stuck or colliding with the ground of the sub-gas reservoir 211 due to the impact or vibration amplitude being too large, thereby affecting the normal use of the cleaning device; At the same time, under the impact and drive of the water flow, the vibration row 4 will vibrate longitudinally along the inclined bottom surface of the sub-gas reservoir 211, and the swing bar 32 will rotate laterally when the stirring rod 3 rotates, thereby coordinating the longitudinal and transverse stirring, fully stirring the vicinity of the bottom surface of the sub-gas reservoir 211, and promoting the cleaning effect of the sludge in the sub-gas reservoir 211.

[0025] As an embodiment of the present invention, the swing bar 32 includes a straight rod segment and a flexible rope segment; By setting the combined action of the straight rod section and the flexible rope section, when the swing bar 32 rotates with the stirring rod 3, the straight rod section can fully stir the liquid near the bottom surface of the sub-air reservoir 211, ensuring a lower limit for the stirring effect of the swing bar 32. At the same time, through the flexibility and swinging effect of the flexible rope section, the action effect of the swing bar 32 is further expanded. When there are large-volume sundries in the silt to cause obstruction, the flexible rope section can deform and scrape along the silt surface to pass through. Thus, while ensuring the stirring effect, it is possible to avoid huge collisions that interfere with the normal use of the cleaning device.

[0026] As an embodiment of the present invention, a retaining ring 331 is installed on the stirring rod 3. The retaining rings 331 are arranged in pairs. A sliding ring 33 is slidably installed on the stirring rod 3. The swing bar 32 is installed on the sliding ring 33. The sliding ring 33 slides back and forth between the retaining rings 331, and there is no relative rotation between the sliding ring 33 and the stirring rod 3. Through the mutual sliding between the sliding ring 33 and the stirring rod 3, the swing bar 32 is further prevented from swinging and rotating at a fixed position, thereby expanding the action range of the swing bar 32 and improving the stirring effect on the silt. At the same time, when the action range of the swing bar 32 increases, there is a possibility of interaction between the flexible rope section at the end of the swing bar 32 and the vibrating row 4, improving the mutual cooperation effect between the swing bar 32 and the vibrating row 4, and making the cleaning effect of the cleaning device on the silt good.

[0027] As an embodiment of the present invention, a silica gel layer is also provided on the surface of the vibrating row 4, and elastic whiskers are provided on the silica gel layer of the vibrating row 4. Since the vibrating row 4 is located below the stirring rod 3, the vibrating row 4 is close to the bottom surface of the sub-air reservoir 211. When the vibrating row 4 is impacted and driven by the water flow, the vibration of the vibrating row 4 will stir the bottom surface of the sub-air reservoir 211. At this time, through the silica gel layer on its surface, the vibrating row 4 is protected to avoid damage and corrosion on its surface. At the same time, by setting the elastic whiskers, the bottom surface of the sub-air reservoir 211 is also stirred, and the situation where the silt is easily blocked by the vibrating row 4 when the vibrating row 4 is directly close to and in contact with the bottom surface of the sub-air reservoir 211 is avoided.

[0028] The specific working process is as follows: Under the control of the control center, the energy storage system operates normally and stably: During energy storage, the outside air is fully compressed into compressed air under the action of the air compression storage unit 11. At the same time, the compressed air will pass through the heat exchange device 13 for heat exchange and cooling, and the heat released will be stored in the high-temperature heat reservoir 142 through the heat exchange working medium. Then, the compressed air will be pumped into the underground gas storage reservoir 2 through the gas transmission pipeline 15. At this time, the water existing in the underground gas storage reservoir 2 will be pressed back to the ground water source 1 through the water transmission pipeline 16; During power generation, the compressed air in the underground gas storage reservoir 2 will pass through the heat exchange device 13 for heat exchange and temperature increase, so that the heat exchange working medium with a higher temperature in the high-temperature heat reservoir 142 will exchange the stored heat to the compressed air, and the heat exchange working medium with a reduced temperature will be stored in the low-temperature heat reservoir 141. Then, after the compressed air is heated through heat exchange, it will enter the air expansion power generation unit 12 to do work and generate electric energy. The air after doing work will be directly discharged into the external environment. At this time, the water in the ground water source 1 will enter the underground gas storage reservoir 2 through the water transmission pipeline 16. Among them, the heat storage reservoir 14 includes the high-temperature heat reservoir 142 and the low-temperature heat reservoir 141; By excavating the tunnel inclined shaft 22, it is convenient for construction equipment to enter the underground for excavation construction of the tunnel horizontal shaft 21, and for subsequent construction treatment of the tunnel inclined shaft 22 and the tunnel horizontal shaft 21. At the same time, after the tunnel inclined shaft 22 is completed, various equipment supporting the energy storage system, such as the high-temperature heat reservoir 142 and the low-temperature heat reservoir 141, are installed in the tunnel inclined shaft 22; By installing the partition wall 23 in the underground gas storage reservoir 2, the underground gas storage reservoir 2 is divided into multiple sub-gas reservoirs 211 by using the partition wall 23. During energy storage, the sealing plates 233 on each partition wall 23 are opened to make the sub-gas reservoirs 211 communicate with each other, which is convenient for compressed air to be stored in the underground gas storage reservoir. After the compressed air storage is completed, the sealing plates 233 are controlled to close the ventilation openings 231 on the partition wall 23 to make the sub-gas reservoirs 211 independent of each other. Then, during power generation, according to the power generation demand, the valves on the corresponding number of sub-gas reservoirs 211 and the corresponding water transmission pipeline 16 and gas transmission pipeline 15 are opened in sequence, so that when the power generation is small, the sub-gas reservoirs 211 are prevented from communicating with each other, resulting in a reduction in the overall pressure in the underground gas storage reservoir 2 and affecting the power generation efficiency; By setting the ground of the sub-gas reservoir 211 to face the outlet direction of the water transmission pipeline 16, when the water transmission pipeline 16 intakes and discharges water into the sub-gas reservoir 211, the water flow will scour the bottom surface of the sub-gas reservoir 211, and promote the water flow to drive the silt to move along the inclined bottom surface, so that the silt is stirred and carried out together with the water flow when the water transmission pipeline 16 discharges water; At the same time, since the underground gas storage reservoir 2 is divided into multiple sub-gas reservoirs 211, the area of each sub-gas reservoir 211 is relatively small. Therefore, when the water transmission pipeline 16 intakes or discharges water into the sub-gas reservoir 211, the water flow can more easily scour and stir the silt on the bottom surface of the sub-gas reservoir 211; Meanwhile, when equipment within each sub-gas storage 211 malfunctions and requires emergency repair, the faulty sub-gas storage 211 can be isolated by the isolation wall 23, facilitating maintenance and repair of the sub-gas storage 211 by staff while the energy storage system is operating normally. Meanwhile, since a venturi-shaped nozzle is installed at the outlet of the water delivery pipe 16 through an elastic member, when water flows into and out of the sub-gas storage 211, the nozzle will vibrate and swing, changing the direction and position of the water flow ejected from the nozzle of the water delivery pipe 16, further agitating the silt within the sub-gas storage 211. When the water delivery pipe 16 sends water into and discharges water from the sub-gas storage 211, the water flow will impact the blades 31 on the stirring rod 3, driving the stirring rod 3 to rotate. As a result, the stirring rod 3 drives the swing bar 32 to rotate near the bottom surface of the sub-gas storage 211, agitating the silt near the bottom surface of the sub-gas storage 211, making the silt and water mix evenly, and facilitating the discharge of the silt with the water flow from the water delivery pipe 16 outside the sub-gas storage 211. Meanwhile, due to the relatively short length of the elastic member connecting the venturi-shaped nozzle on the water delivery pipe 16 and the relatively close position of the blades 31 on the stirring rod 3 to the nozzle, when the venturi-shaped nozzle swings and vibrates under the impact of the water flow, the blades 31 can still be impacted by the water flow, driving the stirring rod 3 to rotate. By setting the silica gel layer, the contact area and contact time between the stirring rod 3, the blades 31, and the swing bar 32 and the liquid within the sub-gas storage 211 are reduced, preventing the stirring rod 3, the blades 31, and the swing bar 32 from being corroded by the liquid. At the same time, since the ground water source 1 is directly exposed to the external environment, the types and qualities of impurities and silt contained in the water source entering the sub-gas storage 211 from the water delivery pipe 16 in the ground water source 1 are different. Therefore, when the stirring rod 3, the blades 31, and the swing bar 32 rotate and agitate within the sub-gas storage 211, there is a possibility of colliding with silt or tiny gravel particles existing in the liquid. The silica gel layer is set to protect the blades 31, the stirring rod 3, and the swing bar 32, avoiding the situation where the anti-rust paint is prone to breakage and falling off during the bumping process when using traditional anti-rust paint. When water flows into and out of the sub-gas storage 211 from the water delivery pipe 16, the water flow will impact the vibration row 4 on the bottom surface of the sub-gas storage 211. At this time, due to the movable connection between the connecting rod 41 and the support 42, the vibration row 4 will vibrate under the action of the water flow, further agitating the silt near the bottom surface of the sub-gas storage 211. Meanwhile, the vibration row 4 supplements the swing bar 32 on the stirring rod 3, ensuring that the bottom surface of the sub-gas storage 211 is fully covered and agitated as much as possible, promoting the agitation and cleaning of the silt near the bottom surface of the sub-gas storage 211. By setting the relative sliding between the support 42 and the connecting rod 41, when the vibrating row 4 is impacted and driven by the water flow, the direction and amplitude of the vibration of the vibrating row 4 are relatively fixed; Meanwhile, under the impact and drive of the water flow, the vibrating row 4 will vibrate longitudinally along the inclined bottom surface of the sub-air reservoir 211, and the swinging bar 32 will rotate transversely when the stirring rod 3 rotates, so as to cooperate with the longitudinal and transverse stirring to fully stir the area near the bottom surface of the sub-air reservoir 211; By setting the combined action of the straight rod section and the flexible rope section, when the swinging bar 32 rotates with the stirring rod 3, the straight rod section can fully stir the liquid near the bottom surface of the sub-air reservoir 211, ensuring the lower limit of the stirring effect of the swinging bar 32. At the same time, through the flexibility and swinging effect of the flexible rope section, the action effect of the swinging bar 32 is further expanded, and when there are large-volume sundries in the sludge to cause obstruction, the flexible rope section can deform and scrape along the surface of the sludge to pass through; Through the mutual sliding between the sliding ring 33 and the stirring rod 3, the swinging bar 32 is further prevented from swinging and rotating at a fixed position, expanding the action range of the swinging bar 32 and improving the stirring effect on the sludge. At the same time, when the action range of the swinging bar 32 increases, there is a possibility of interaction between the flexible rope section at the end of the swinging bar 32 and the vibrating row 4, improving the mutual cooperation effect between the swinging bar 32 and the vibrating row 4; Since the vibrating row 4 is located below the stirring rod 3, the vibrating row 4 is close to the bottom surface of the sub-air reservoir 211. When the vibrating row 4 is impacted and driven by the water flow, the vibration of the vibrating row 4 will stir the bottom surface of the sub-air reservoir 211. At this time, the vibrating row 4 is protected through the silica gel layer on its surface. At the same time, by setting the elastic whiskers, the bottom surface of the sub-air reservoir 211 is also stirred, and when the vibrating row 4 is directly close to and contacts the bottom surface of the sub-air reservoir 211, the situation that the sludge is blocked by the vibrating row 4 is avoided.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A tunnel inclined shaft heat storage isobaric compressed air energy storage system, characterized by: It comprises a surface water source (1) and an underground gas storage reservoir (2), wherein the underground gas storage reservoir (2) is arranged in an underground tunnel horizontal well (21), the tunnel horizontal well (21) is connected to the ground through a tunnel inclined well (22), and the underground gas storage reservoir (2) is connected to the surface water source (1) through a water pipeline (16); It also comprises an air compression storage unit (11), an air expansion generator unit (12), a heat exchange device (13) and a heat storage reservoir (14); the air compression storage unit (11) compresses air and stores it in an underground gas storage reservoir (2); the air expansion generator unit (12) is used to expand the compressed air released from the underground gas storage reservoir (2) to generate electrical energy; the heat exchange device (13) is used to exchange heat for cooling when air is compressed and to exchange heat for heating when air is expanded; and the heat exchange medium used by the heat exchange device (13) in the heat exchange process is stored in the heat storage reservoir (14); An isolation wall (23) is installed in the underground gas storage reservoir (2), a vent (231) is opened at the upper end of the isolation wall (23), a sealing plate (233) is installed in the vent (231), and the sealing plate (233) is driven to move by a hydraulic cylinder (232). The isolation wall (23) divides the underground gas storage reservoir (2) into a plurality of sub-gas reservoirs (211), the sub-gas reservoirs (211) are connected to the water pipeline (16) and the gas pipeline (15), and the liquid level in the sub-gas reservoir (211) is lower than the height of the vent (231); The ground of the sub-gas reservoir (211) is arranged at an inclination, the outlet of the water pipeline (16) is located at the lower end of the ground of the sub-gas reservoir (211), and a venturi-shaped nozzle is arranged at the outlet of the water pipeline (16) in the sub-gas reservoir (211), and the nozzle and the outlet of the water pipeline (16) are connected to each other via an elastic member.

2. According to claim 1, a tunnel inclined shaft heat storage isobaric compressed air energy storage system is characterized by: Also included is a cleaning device, the cleaning device being installed in the underground gas storage reservoir (2), the cleaning device comprising a stirring rod (3), the stirring rod (3) being installed with blades (31) and a swing bar (32), the stirring rod (3) being fixedly installed on the inner wall of the underground gas storage reservoir (2) via a mounting block (34); A plurality of groups of stirring rods (3) are arranged in the sub-gas reservoir (211), the stirring rods (3) are connected to each other for transmission, and the blades (31) are aligned with the outlet of the water delivery pipeline (16) in the sub-gas reservoir (211); The center line of the stirring rod (3) and the inclination direction of the ground of the sub-gas reservoir (211) are parallel to each other.

3. According to claim 2, a tunnel inclined shaft heat storage isobaric compressed air energy storage system is characterized by: The surfaces of the stirring rod (3), the blades (31) and the swinging bar (32) are provided with a silica gel layer, and the surface of the silica gel layer is subjected to a hydrophobic treatment.

4. According to claim 2, a tunnel inclined shaft heat storage isobaric compressed air energy storage system is characterized by: A vibration row (4) is installed in the sub-gas reservoir (211), and two ends of the vibration row (4) are respectively installed on a connecting rod (41), and the connecting rod (41) is installed on the bottom surface of the sub-gas reservoir (211) through a bracket (42), and the connecting rod (41) and the bracket (42) are movably connected.

5. According to claim 4, a tunnel inclined shaft heat storage isobaric compressed air energy storage system is characterized by: The bracket (42) is installed at both ends of the connecting rod (41), and relative sliding occurs between the bracket (42) and the connecting rod (41). The length direction of the vibration row (4) is perpendicular to the outlet direction of the water delivery pipe (16).

6. According to claim 4, a tunnel inclined shaft heat storage isobaric compressed air energy storage system is characterized by: The swing bar (32) comprises a straight rod section and a flexible rope section.

7. According to claim 5, a tunnel inclined shaft heat storage isobaric compressed air energy storage system is characterized by: The stirring rod (3) is provided with a retaining ring (331), the retaining ring (331) is arranged in pairs, a sliding ring (33) is slidably mounted on the stirring rod (3), the swing bar (32) is mounted on the sliding ring (33), the sliding ring (33) slides back and forth between the retaining rings (331), and no relative rotation occurs between the sliding ring (33) and the stirring rod (3).

8. According to claim 7, a tunnel inclined shaft heat storage isobaric compressed air energy storage system is characterized by: A silicone layer is also provided on the surface of the vibration row (4), and elastic whiskers are provided on the silicone layer of the vibration row (4).

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