A method for recovering and utilizing energy in a nitrogen blocking solution water dissolving cavity process

Abstract

This invention relates to the field of energy recovery and utilization technology, specifically to a method for energy recovery and utilization during nitrogen-inhibited water-soluble cavity formation. The power generation device includes a base, a first generator, and a water pipe. The outer wall of the water pipe is fixed to the top of the outer wall of the base via a pair of first square plates. A square shell is fixed to the top of the outer wall of the water pipe, and the square shell is connected to the water pipe. This invention connects the water pipe to a brine discharge channel. Brine flows into the water pipe and impacts a set of rotating plates as it flows, causing the plates to rotate. The rotation of the plates drives a rotating shaft, which in turn drives the rotor of the first generator to rotate, thus generating electricity. This converts the potential energy of the brine into electrical energy. Finally, the brine flows into a heat recovery device for geothermal energy recovery. This device not only recovers and utilizes the geothermal energy of the brine but also recovers and utilizes the potential energy of the flowing brine, thereby further reducing energy consumption and waste.

Description

Technical Field

[0001] This invention relates to the field of energy recovery and utilization technology, specifically to a method for energy recovery and utilization during nitrogen-inhibited water-soluble cavity creation. Background Technology

[0002] In underground salt mining, nitrogen-based water-dissolution cavity construction technology is widely used. This technology involves injecting nitrogen into the cavity, forming a nitrogen isolation layer at the top of the cavity. Because nitrogen is insoluble in water and does not react with salt rock, and is less dense than water, it effectively prevents fresh water from directly contacting the salt rock, protecting the cavity top from excessive dissolution. Furthermore, this technology does not use harmful chemicals, and nitrogen is relatively inexpensive, ensuring the stability and airtightness of the cavity shape. These advantages have led to its widespread use in underground salt mining.

[0003] In existing technologies, although geothermal energy in the brine of underground salt mines is recovered and used for power generation during mining, the potential energy generated when the brine flows is not well utilized, resulting in wasted energy and increased energy consumption costs. Summary of the Invention

[0004] The purpose of this invention is to address the problem that, although geothermal energy in the brine of underground salt mines is recovered and utilized for power generation during mining, the potential energy generated by the brine during its flow is not well utilized, resulting in wasted energy and increased energy consumption costs. Therefore, this invention proposes an energy recovery and utilization method during the nitrogen-inhibited water-soluble cavity-forming process.

[0005] The objective of this invention can be achieved through the following technical solutions: A method for energy recovery and utilization during nitrogen-inhibited water-soluble cavity creation process, the method comprising the following steps: Step 1: Select an underground salt mine of a certain volume; Step 2: In the early stages of underground salt mining, nitrogen is injected to form a nitrogen isolation layer at the top of the cavity, preventing rapid dissolution and thus expanding the lower cavity; Step 3: Establish a connection channel between the ground and underground storage spaces, including a water injection channel and a brine discharge channel; Step 4: Close the valve in the brine discharge channel at night, and then inject water into the water injection channel through the high-pressure pump. During the water injection process, the water pressure will gradually increase to 6-7 MPa. During the continuous water injection to create the cavity, the nitrogen gas that is inhibited will be compressed and stored as energy. Step 5: During the day, open the valve in the brine discharge channel to discharge the brine. At the same time, the high-pressure pump continues to inject water. When the brine is discharged under pressure, the potential energy of the brine flow will be converted into electrical energy through the power generation device. Step Six: When the high-pressure pump is injecting water, the power is transmitted to the high-pressure pump through the generator to keep the water injection pressure at 6-7 MPa. Step 7: When the brine is discharged through the brine discharge channel, the temperature of the brine is 50-60℃. After the brine generates electricity through the power generation device, it enters the heat recovery device, which recovers and reuses the geothermal energy in the brine.

[0006] In a preferred embodiment of the present invention, the power generation device includes a base, a first generator, and a water pipe; the outer wall of the water pipe is fixed to the top of the outer wall of the base via a pair of first square plates; a square shell is fixed to the top of the outer wall of the water pipe, and the square shell is connected to the water pipe; the bottom of the outer wall of the heat recovery device is fixed to the top of the outer wall of the base, and one end of the outer wall of the water pipe is connected to the heat recovery device; the bottom of the outer wall of the first generator is fixed to the top of the outer wall of the base; the output end of the first generator is provided with a rotating shaft, and one end of the outer wall of the rotating shaft penetrates one side of the outer wall of the square shell and is located inside the square shell; a set of rotating plates is fixed to the outer wall of the end of the rotating shaft located inside the square shell, and the set of rotating plates is located inside the square shell and the water pipe, respectively.

[0007] In a preferred embodiment of the present invention, a second generator is provided at the top of the outer wall of the base; a first rotating shaft is provided at the output end of the second generator; a first bevel gear is fixedly connected to the outer wall of one end of the rotating shaft outside the square shell; a second bevel gear is fixedly connected to one end of the outer wall of the first rotating shaft, and the first bevel gear and the second bevel gear mesh with each other, and the radius of the first bevel gear is greater than the radius of the second bevel gear.

[0008] In a preferred embodiment of the present invention, the rotating plate includes a square plate and a buffer shell; one end of the outer wall of the square plate is fixedly connected to the outer wall of the rotating shaft; a groove is formed on one side of the outer wall of the square plate; the inner wall of the buffer shell is slidably connected to the outer wall of the square plate, and one side of the outer wall of the buffer shell is slidably connected to one side of the inner wall of the groove, forming a sealed space between the buffer shell and the square plate; a pair of first springs are fixedly connected to one side of the outer wall of the square plate, and one end of the outer wall of the pair of first springs is fixedly connected to one side of the inner wall of the buffer shell, with the first springs located within the sealed space.

[0009] In a preferred embodiment of the present invention, the bottom of the outer wall of the second generator is slidably connected to the top of the outer wall of the base; a pair of limiting grooves are provided at the top of the outer wall of the base; a bolt is threadedly connected to the top of the outer wall of the base plate of the second generator, and the bottom of the outer wall of the bolt penetrates through the base plate of the second generator, and the bolt is threadedly connected to the base plate of the second generator; the bolt matches the pair of limiting grooves.

[0010] In a preferred embodiment of the present invention, a third helical gear is fixedly connected to the outer wall of one end of the rotating shaft located inside the square shell; a rotating rod is rotatably connected to the inner wall of the water pipe via a first block; a fourth helical gear is fixedly connected to one end of the outer wall of the rotating rod, and the fourth helical gear meshes with the third helical gear; an annular cleaning plate is rotatably connected to the inner wall of the water pipe; a set of cleaning rods is provided on one side of the outer wall of the annular cleaning plate; a first annular rack is fixedly connected to the other side of the outer wall of the annular cleaning plate, and the first annular rack is rotatably connected to the inner wall of the water pipe; a fifth gear is fixedly connected to the other end of the outer wall of the rotating rod, and the fifth gear meshes with the first annular rack.

[0011] In a preferred embodiment of the present invention, one end of the outer wall of the cleaning rod is rotatably connected to one side of the outer wall of the annular cleaning plate; an annular groove is provided on the outer wall of the cleaning rod; a sixth gear is fixedly connected to the inner wall of the annular groove; a second annular rack is fixedly connected to the inner wall of the water pipe, and the second annular rack meshes with a set of sixth gears.

[0012] In a preferred embodiment of the present invention, the rotating rod includes a circular shell and a circular rod; the outer side wall of the circular rod is slidably connected to the inner side wall of the circular shell; one end of the outer wall of the fifth gear is fixedly connected to one end of the outer wall of the circular rod; a second spring is fixedly connected to one side of the inner wall of the circular shell, and one end of the outer wall of the second spring is fixedly connected to one end of the outer wall of the circular rod; a trapezoidal block is rotatably connected to the outer side wall of the circular rod; a threaded rod is threadedly connected to the outer side wall of the water pipe, and one end of the outer wall of the threaded rod penetrates the outer side wall of the water pipe and is located inside the water pipe; a movable plate is rotatably connected to one end of the outer wall of the threaded rod located inside the water pipe, and one side of the outer wall of the movable plate is slidably connected to the inclined surface of the trapezoidal block.

[0013] In a preferred embodiment of the present invention, a first square shell is fixedly connected to the top of the outer wall of the water pipe, and the first square shell is connected to the water pipe; a flow limiting plate is slidably connected to the inner wall of the first square shell, and the flow limiting plate matches the water pipe; a set of circular holes are opened on one side of the outer wall of the flow limiting plate; a tension rod is fixedly connected to the top of the outer wall of the flow limiting plate, and the top of the outer wall of the tension rod penetrates the first square shell, and the tension rod is slidably connected to the first square shell.

[0014] In a preferred embodiment of the present invention, a pair of fixing grooves are provided on one side of the outer wall of the tension rod; a pulling rod is slidably connected to one side of the outer wall of the first square shell through a connecting plate, and the connecting plate is L-shaped; a fixing block is fixedly connected to one end of the outer wall of the pulling rod, and the fixing block matches the fixing groove; a fourth spring is fixedly connected to one end of the outer wall of the fixing block, and one end of the outer wall of the fourth spring is fixedly connected to one side of the inner wall of the connecting plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The rotating plate, consisting of a square plate and a buffer shell, allows the brine to impact the rotating plate first. The brine then impacts the buffer shell, causing the first spring to contract, thus dissipating part of the buffering force. This reduces the impact force of the first wave, thereby reducing damage to the rotating plate, increasing its service life, and making the overall device safer and more stable.

[0016] 2. When the rotating shaft rotates, it drives the third helical gear to rotate. Since a fourth helical gear is fixedly connected to one end of the outer wall of the rotating rod, and the fourth helical gear meshes with the third helical gear, the rotation of the third helical gear drives the rotating rod to rotate through the fourth helical gear. The rotation of the rotating rod drives the fifth gear to rotate. Since the fifth gear meshes with the first ring rack, and the first ring rack is fixedly connected to the other side of the outer wall of the ring cleaning plate, and the first ring rack is rotatably connected to the inner wall of the water pipe, the rotation of the fifth gear drives the first ring rack and the ring cleaning plate to rotate. The rotation of the ring cleaning plate drives a set of cleaning rods to rotate, thereby cleaning the salt deposits on the inner wall of the water pipe. This makes the brine transportation safer and more stable, and also makes the salt deposits in the brine less likely to increase energy consumption. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a structural diagram of the main body of the present invention; Figure 2 This is a structural diagram of the first and second generators, the base, and the rotating plate of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 This is an exploded structural diagram of the square plate and buffer shell of the present invention; Figure 5 This is an exploded view of the rotating rod and the annular cleaning plate of the present invention; Figure 6 This is an exploded structural diagram of the circular shell and circular rod of the present invention; Figure 7This is an exploded view of the cleaning rod and the sixth gear of the present invention; Figure 8 This is an exploded structural diagram of the first rectangular shell and the flow-limiting plate of the present invention; Figure 9 For the present invention Figure 8 A magnified view of part A.

[0019] In the diagram: 1. Power generation device; 101. Base; 102. First generator; 103. Water pipe; 2. Square shell; 3. Heat recovery device; 4. Rotating shaft; 5. Rotating plate; 6. Second generator; 7. First rotating shaft; 8. First bevel gear; 9. Second bevel gear; 501. Square plate; 502. Buffer shell; 10. Slide groove; 11. Limiting groove; 12. Bolt; 13. Third helical gear; 14. Rotating rod; 15. Fourth... 16. Helical gear; 17. Annular cleaning plate; 18. Cleaning rod; 19. First annular rack; 20. Fifth gear; 21. Annular groove; 22. Sixth gear; 23. Second annular rack; 141. Circular shell; 142. Circular rod; 23. Trapezoidal block; 24. Threaded rod; 25. Moving plate; 26. First square shell; 27. Flow limiting plate; 28. Circular hole; 29. ​​Tensioning rod; 30. Fixing groove; 31. Pulling rod; 32. Fixing block. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figures 1-7As shown, an energy recovery and utilization method in the process of nitrogen-inhibited water-soluble cavity creation is implemented based on a power generation device 1. The power generation device 1 includes a base 101, a first generator 102, and a water pipe 103. The outer wall of the water pipe 103 is fixed to the top of the outer wall of the base 101 by a pair of first square plates. A square shell 2 is fixed to the top of the outer wall of the water pipe 103 and is connected to the water pipe 103. The bottom of the outer wall of the heat recovery device 3 is fixed to the top of the outer wall of the base 101, and one end of the outer wall of the water pipe 103 is connected to the heat recovery device 3. The bottom of the outer wall of the first generator 102 is fixed to the top of the outer wall of the base 101. The output end of the first generator 102 is provided with a rotating shaft 4, and one end of the outer wall of the rotating shaft 4 passes through one side of the outer wall of the square shell 2 and is located inside the square shell 2. A set of rotating shafts is fixed to the outer wall of the end of the rotating shaft 4 located inside the square shell 2. Plate 5, and a set of rotating plates 5 are respectively located in the square shell 2 and the water pipe 103. By connecting the water pipe 103 to the brine discharge channel, when the brine is discharged from the brine discharge channel, the brine will flow into the water pipe 103. Since a set of rotating plates 5 are respectively located in the square shell 2 and the water pipe 103, the brine will impact the set of rotating plates 5 when flowing in the water pipe 103, causing the set of rotating plates 5 to rotate. The rotation of the rotating plates 5 will drive the rotating shaft 4 to rotate, and the rotation of the rotating shaft 4 will drive the rotor of the first generator 102 to rotate, thereby generating electricity. Thus, the potential energy generated by the flow of brine is converted into electrical energy. The brine flowing in the water pipe 103 will eventually flow into the heat energy recovery device 3 for geothermal energy recovery. This device not only recovers and utilizes the geothermal energy of the brine but also recovers and utilizes the potential energy of the brine flow, thereby further saving energy consumption and waste, and improving energy utilization efficiency.

[0022] The rotating plate 5 includes a square plate 501 and a buffer shell 502; one end of the outer wall of the square plate 501 is fixed to the outer wall of the rotating shaft 4; a groove 10 is provided on one side of the outer wall of the square plate 501; the inner wall of the buffer shell 502 is slidably connected to the outer wall of the square plate 501, and one side of the outer wall of the buffer shell 502 is slidably connected to one side of the inner wall of the groove 10, forming a sealed space between the buffer shell 502 and the square plate 501; a pair of first springs are fixedly connected to one side of the outer wall of the square plate 501, and one end of the outer wall of the pair of first springs is fixedly connected to one side of the inner wall of the buffer shell 502. The first springs are located in the sealed space. When the brine impacts the rotating plate 5, causing the rotating plate 5 to rotate, when one of the rotating plates 5 is in the brine... When the brine enters the square shell 2 under the impact, another rotating plate 5 will appear in the water pipe 103 to be impacted by the brine. Because the brine has a large impact force under pressure, the impact force of the rotating plate 5 is the greatest when it first comes into contact with the brine, which makes the rotating plate 5 easy to damage. The rotating plate 5 includes a square plate 501 and a buffer shell 502. When the rotating plate 5 comes into contact with the brine, the brine will first impact the buffer shell 502. The buffer shell 502 will drive the first spring to contract, thereby dissipating part of the buffer force. This reduces the damage to the rotating plate 5, increases the service life of the rotating plate 5, and makes the overall device safer and more stable.

[0023] A third helical gear 13 is fixedly connected to the outer wall of one end of the rotating shaft 4 inside the square shell 2; a rotating rod 14 is rotatably connected to the inner wall of the water pipe 103 via the first block; a fourth helical gear 15 is fixedly connected to one end of the outer wall of the rotating rod 14, and the fourth helical gear 15 meshes with the third helical gear 13; an annular cleaning plate 16 is rotatably connected to the inner wall of the water pipe 103; a set of cleaning rods 17 is provided on one side of the outer wall of the annular cleaning plate 16; a first annular rack 18 is fixedly connected to the other side of the outer wall of the annular cleaning plate 16. Furthermore, the first annular rack 18 is rotatably connected to the inner wall of the water pipe 103; the other end of the outer wall of the rotating rod 14 is fixedly connected to the fifth gear 19, and the fifth gear 19 meshes with the first annular rack 18. Because the brine is a high-concentration salt water containing various chemical components, salt will form when the brine flows in the water pipe 103. Salt formation in the brine not only causes the formation of a hard scale layer on the inner wall of the water pipe 103, leading to pipe blockage, but also increases the roughness of the inner wall of the pipe, increasing the resistance during the flow of the brine. The increase in size leads to increased energy consumption. When the rotating shaft 4 rotates, the rotation of the rotating shaft 4 will drive the third helical gear 13 to rotate. Since the fourth helical gear 15 is fixedly connected to one end of the outer wall of the rotating rod 14, and the fourth helical gear 15 meshes with the third helical gear 13, the rotation of the third helical gear 13 drives the rotating rod 14 to rotate through the fourth helical gear 15. The rotation of the rotating rod 14 will drive the fifth gear 19 to rotate. Since the fifth gear 19 meshes with the first annular rack 18, and the first annular rack 18 is fixedly connected to the other side of the outer wall of the annular cleaning plate 16, and the first annular rack 18 is rotatably connected to the inner wall of the water pipe 103, the rotation of the fifth gear 19 will drive the first annular rack 18 and the annular cleaning plate 16 to rotate. The rotation of the annular cleaning plate 16 will drive a set of cleaning rods 17 to rotate, so that the rotation of the set of cleaning rods 17 will clean the salt deposits on the inner wall of the water pipe 103. This makes the brine transportation safer and more stable, and also makes the salt deposits in the brine less likely to increase energy consumption.

[0024] A second generator 6 is provided at the top of the outer wall of the base 101; a first rotating shaft 7 is provided at the output end of the second generator 6; a first bevel gear 8 is fixedly connected to the outer wall of one end of the rotating shaft 4 outside the square shell 2; a second bevel gear 9 is fixedly connected to one end of the outer wall of the first rotating shaft 7, and the first bevel gear 8 and the second bevel gear 9 mesh with each other. The radius of the first bevel gear 8 is larger than the radius of the second bevel gear 9. When the rotating shaft 4 rotates, the rotation of the rotating shaft 4 will drive the first bevel gear 8 to rotate. Because the first bevel gear 8 and the second bevel gear 9 mesh with each other, the rotation of the first bevel gear 8 will drive the second bevel gear 9 to rotate. The rotation of the second bevel gear 9 will drive the rotor of the second generator 6 to rotate through the first rotating shaft 7 to generate electricity. Thus, this device can recover and utilize more energy through the potential energy of the brine flow. Moreover, because the radius of the first bevel gear 8 is larger than the radius of the second bevel gear 9, the rotation speed of the second generator 6 is greater than that of the first generator 102, thereby generating more electrical energy. Thus, this device not only further improves the energy utilization efficiency, but also reduces the cost of energy consumption.

[0025] One end of the outer wall of the cleaning rod 17 is rotatably connected to one side of the outer wall of the annular cleaning plate 16; an annular groove 20 is formed on the outer wall of the cleaning rod 17; a sixth gear 21 is fixedly connected to the inner wall of the annular groove 20; a second annular rack 22 is fixedly connected to the inner wall of the water pipe 103, and the second annular rack 22 meshes with a set of sixth gears 21. When the cleaning rod 17 moves in a circular motion around the center point of the annular cleaning plate 16, the rotation of the cleaning rod 17 will drive the sixth gear 21 to rotate. Because the second annular rack 22 meshes with a set of sixth gears 21... When the six gears 21 rotate, the second ring rack 22 will rotate on its own axis because the second ring rack 22 is stationary. This causes the sixth gear 21 to drive the cleaning rod 17 to rotate. As a result, when the cleaning rod 17 cleans the salt deposits on the inner wall of the water pipe 103, the rotation of the cleaning rod 17 not only improves the efficiency of cleaning the salt deposits, but also causes the salt deposits on the outer surface of the cleaning rod 17 to rub against the salt deposits on the inner wall of the water pipe 103. This not only cleans the salt deposits on the inner wall of the water pipe 103, but also cleans the salt deposits on the outer surface of the cleaning rod 17.

[0026] The rotating rod 14 includes a circular shell 141 and a circular rod 142; the outer side wall of the circular rod 142 is slidably connected to the inner side wall of the circular shell 141; one end of the outer wall of the fifth gear 19 is fixedly connected to one end of the outer wall of the circular rod 142; a second spring is fixedly connected to one side of the inner wall of the circular shell 141, and one end of the outer wall of the second spring is fixedly connected to one end of the outer wall of the circular rod 142; a trapezoidal block 23 is rotatably connected to the outer side wall of the circular rod 142; a threaded rod 24 is threadedly connected to the outer side wall of the water pipe 103, and one end of the outer wall of the threaded rod 24 penetrates the outer side wall of the water pipe 103 and is located inside the water pipe 103; a movable plate 25 is rotatably connected to one end of the outer wall of the threaded rod 24 located inside the water pipe 103, and one side of the outer wall of the movable plate 25 is slidably connected to the trapezoidal block 23. On the inclined surface, when the cleaning rod 17 does not need to rotate, the threaded rod 24 is rotated. Since the threaded rod 24 is threadedly connected to the water pipe 103, the rotation of the threaded rod 24 causes the threaded rod 24 to move. The movement of the threaded rod 24 will drive the moving plate 25 to move. The movement of the moving plate 25 causes one side of the outer wall of the moving plate 25 to slide on the inclined surface of the trapezoidal block 23, thereby causing the trapezoidal block 23 to drive the circular rod 142 to move backward, thereby causing the fifth gear 19 to disengage from the first annular rack 18, so that the cleaning rod 17 will not rotate. When the cleaning rod 17 needs to rotate, the threaded rod 24 can be reversed. Thus, when the device needs to reduce the burden on the rotating plate 5 or does not need to clean the salt deposits temporarily, the cleaning rod 17 can be prevented from rotating by rotating the threaded rod 24.

[0027] The bottom of the outer wall of the second generator 6 is slidably connected to the top of the outer wall of the base 101; a pair of limiting grooves 11 are provided at the top of the outer wall of the base 101; a bolt 12 is threadedly connected to the top of the outer wall of the base plate of the second generator 6, and the bottom of the outer wall of the bolt 12 penetrates through the base plate of the second generator 6, and the bolt 12 is threadedly connected to the base plate of the second generator 6; the bolt 12 matches the pair of limiting grooves 11. When the potential energy of the brine is low or decreases, the potential energy of the brine may not be able to drive the first generator 102 and the second generator 6 to operate simultaneously, because the bottom of the outer wall of the second generator 6 is slidably connected to the top of the outer wall of the base 101. When the potential energy of the brine is lowered or reduced, the bolt 12 is rotated to move it out of the limiting groove 11, releasing the fixation between the second generator 6 and the base 101. Then, the second generator 6 is moved to disengage the first bevel gear 8 and the second bevel gear 9. After the second generator 6 is moved to a certain position, the bolt 12 is rotated to engage in another limiting groove 11, thus completing the fixation of the second generator 6. At this time, the potential energy of the brine only needs to drive the first generator 102 to run, so that the device can adjust the position of the second generator 6 according to the potential energy generated by the brine, so that the first generator 102 can operate normally.

[0028] Example 2: Please refer to Figure 1 and Figures 8-9As shown, a first square shell 26 is fixedly connected to the top of the outer wall of the water pipe 103, and the first square shell 26 is connected to the water pipe 103; a flow limiting plate 27 is slidably connected to the inner wall of the first square shell 26, and the flow limiting plate 27 matches the water pipe 103; a set of round holes 28 are opened on one side of the outer wall of the flow limiting plate 27; a tension rod 29 is fixedly connected to the top of the outer wall of the flow limiting plate 27, and the top of the outer wall of the tension rod 29 penetrates the first square shell 26. The tension rod 29 is slidably connected to the first square shell 26. When the brine is discharged, the brine will have different flow velocities due to the pressure, which increases the impact force of the brine on the rotating plate 5. The difference makes it easy for the rotating plate 5 to be damaged under high pressure, thus greatly reducing the service life of the rotating plate 5. By matching the flow limiting plate 27 with the water pipe 103, when the impact force of the brine is large, the flow limiting plate 27 can be lowered so that the impact force of the brine will first hit the flow limiting plate 27, and then continue to flow through the round hole 28 on the flow limiting plate 27 before contacting the rotating plate 5. Because the brine contacts the flow limiting plate 27 first and then the rotating plate 5, the limiting plate can play a buffering role, reducing the impact force of the rotating plate 5 that subsequently contacts the brine, thereby ensuring the safety of the rotating plate 5.

[0029] A pair of fixing grooves 30 are provided on one side of the outer wall of the tension rod 29; a pulling rod 31 is slidably connected to one side of the outer wall of the first square shell 26 via a connecting plate, and the connecting plate is L-shaped; a fixing block 32 is fixedly connected to one end of the outer wall of the pulling rod 31, and the fixing block 32 matches the fixing groove 30; a fourth spring is fixedly connected to one end of the outer wall of the fixing block 32, and one end of the outer wall of the fourth spring is fixedly connected to one side of the inner wall of the connecting plate. When the flow limiting plate 27 is not needed, the fixing block 32 is inserted into the fixing groove 30 below the tension rod 29, so that the fixing block 32 fixes the tension rod 29 and the flow limiting plate 27. The flow-limiting plate 27 is fixed in place to prevent it from moving. When the flow-limiting plate 27 needs to be used, the pulling rod 31 is pulled to move the fixing block 32 out of the fixing groove 30 and into contact with the fixing of the flow-limiting plate 27. The flow-limiting plate 27 moves downward under the action of gravity. At this time, the pulling rod 31 is released, and the spring of the fourth spring will drive the fixing block 32 to lock into the fixing groove 30 on the tension rod 29, thus completing the fixing of the flow-limiting plate 27. This makes it difficult for the flow-limiting plate 27 to move when limiting and buffering the flow of brine, making the operation of this device simple and convenient whether the flow-limiting plate 27 is used or not.

[0030] In use, this invention involves injecting nitrogen gas during the initial stage of underground salt mining to form a nitrogen isolation layer at the top of the cavity, preventing rapid dissolution and thus expanding the lower cavity. A connection channel is then established between the surface and underground storage space, including a water injection channel and a brine discharge channel. At night, the valve in the brine discharge channel is closed, and water is injected into the water injection channel via a high-pressure pump. During the injection process, the water pressure gradually increases to 6-7 MPa. During this continuous water injection and cavity building process, the nitrogen gas used for cavity construction is compressed and stored as energy. During the day, when the pressure in the underground storage space reaches the standard, the valve in the brine discharge channel is opened to discharge the brine. Simultaneously, the high-pressure pump continues to inject water. As the brine is discharged under pressure, the water pipe 103 is first connected to the brine discharge channel, allowing the brine to... When the water flows through pipe 103, it impacts a set of rotating plates 5, causing them to rotate. This rotation drives a rotating shaft 4, which in turn drives the rotor of the first generator 102, generating electricity. This converts the potential energy generated by the brine flow into electrical energy. Furthermore, during brine discharge, when the high-pressure pump injects water, the power generation device 1 transmits electricity to the pump, allowing it to operate on its own, reducing electricity costs and maintaining the injection pressure at 6-7 MPa. This ensures sufficient potential energy for the brine during discharge. When the brine is discharged through the discharge channel, its temperature is 50-60°C. As the brine flows through pipe 103 into the heat recovery device 3, the heat recovery device recovers and reuses the geothermal energy within the brine. This improves the energy utilization efficiency of the device. When the brine impacts the rotating plate 5, causing it to rotate, when one rotating plate 5 enters the square shell 2 under the impact of the brine, the other rotating plate 5 will appear in the water pipe 103 and be impacted by the brine. Because the brine has a large impact force under pressure, the impact force is the greatest when the rotating plate 5 first comes into contact with the brine, making it prone to damage. The rotating plate 5 includes a square plate 501 and a buffer shell 502. When the rotating plate 5 comes into contact with the brine, the brine will first impact the buffer shell 502. The buffer shell 502 will drive the first spring to contract, thereby dissipating part of the buffer force and reducing the impact force of the first wave, thus reducing the damage to the rotating plate 5. The service life is increased, making the overall device safer and more stable. When the rotating shaft 4 rotates, the rotation of the rotating shaft 4 will drive the third helical gear 13 to rotate. Since a fourth helical gear 15 is fixedly connected to one end of the outer wall of the rotating rod 14, and the fourth helical gear 15 meshes with the third helical gear 13, the rotation of the third helical gear 13 drives the rotating rod 14 to rotate through the fourth helical gear 15. The rotation of the rotating rod 14 will drive the fifth gear 19 to rotate. Since the fifth gear 19 meshes with the first annular rack 18, and the first annular rack 18 is fixedly connected to the other side of the outer wall of the annular cleaning plate 16, and the first annular rack 18 is rotatably connected to the inner wall of the water pipe 103, the rotation of the fifth gear 19 will drive the first annular rack 18 and the annular cleaning plate 16 to rotate.The rotation of the annular cleaning plate 16 drives a set of cleaning rods 17 to rotate, thereby cleaning the salt deposits on the inner wall of the water pipe 103. This makes the brine transportation safer and more stable, and also reduces the energy consumption caused by salt deposits. Furthermore, when the cleaning rods 17 revolve around the center point of the annular cleaning plate 16, their rotation drives the sixth gear 21 to rotate. Because the second annular rack 22 meshes with the sixth gear 21, the rotation of the sixth gear 21 causes the second annular rack 22 to rotate, thus rotating the cleaning rods 17. Therefore, when cleaning the salt deposits on the inner wall of the water pipe 103, the rotation of the cleaning rods 17 not only improves the cleaning efficiency but also... The efficiency of salt removal is improved by the rotation of the cleaning rod 17, which causes the salt deposits on the outer surface of the cleaning rod 17 to rub against the salt deposits on the inner wall of the water pipe 103. This not only removes the salt deposits on the inner wall of the water pipe 103 but also removes the salt deposits on the outer surface of the cleaning rod 17. Furthermore, by rotating the rod 14, which includes a circular shell 141 and a circular rod 142, the rotation of the threaded rod 24 causes it to move due to its threaded connection with the water pipe 103. This movement of the threaded rod 24 drives the moving plate 25 to move. The movement of the moving plate 25 causes one side of its outer wall to slide on the inclined surface of the trapezoidal block 23, thereby causing the trapezoidal block 23 to move the circular rod 142 backward. This causes the fifth gear 19 to disengage from the first annular rack 18, thus allowing the cleaning rod to move backward. 17 will not rotate. When cleaning rod 17 needs to rotate, simply reverse threaded rod 24. This allows the device to reduce the burden on rotating plate 5 or temporarily eliminate the need for salt cleaning. When rotating shaft 4 rotates, it drives the first bevel gear 8. Because the first bevel gear 8 and the second bevel gear 9 mesh, the rotation of the first bevel gear 8 drives the rotation of the second bevel gear 9. The rotation of the second bevel gear 9, through the first rotating shaft 7, drives the rotor of the second generator 6 to generate electricity. This allows the device to recover and utilize more energy from the potential energy of the brine flow. Furthermore, because the radius of the first bevel gear 8 is larger than the radius of the second bevel gear 9, the rotational speed of the second generator 6 is greater than... The first generator 102 generates more electrical energy, thereby further improving the energy utilization efficiency of the device and reducing the cost of energy consumption. When the potential energy of the brine is low or reduced, it may not be able to power both the first generator 102 and the second generator 6 simultaneously. Since the bottom of the outer wall of the second generator 6 is slidably connected to the top of the outer wall of the base 101, when the potential energy of the brine is low or reduced, rotating the bolt 12 moves it out of the limiting groove 11, releasing the second generator 6 from the base 101. Then, moving the second generator 6 disengages the first bevel gear 8 and the second bevel gear 9. After the second generator 6 moves to a certain position, rotating the bolt 12 causes it to engage in another limiting groove 11.After the second generator 6 is fixed in place, the potential energy of the brine only needs to drive the first generator 102. This allows the device to adjust the position of the second generator 6 based on the potential energy generated by the brine, ensuring the first generator 102 operates normally. However, when the brine is discharged, its flow rate varies depending on the pressure, resulting in varying impact forces on the rotating plate 5. Under higher pressure, the rotating plate 5 is easily damaged, significantly reducing its lifespan. By matching the flow-limiting plate 27 with the water pipe 103, when the brine's impact force is high, the flow-limiting plate 27 can be lowered. This allows the brine's impact force to first strike the flow-limiting plate 27, then continue flowing through the circular holes 28 on the flow-limiting plate 27 before contacting the rotating plate 5. Because the brine first contacts the flow-limiting plate 27 and then the rotating plate 5, the limiting plate acts as a buffer. This design reduces the impact force on the rotating plate 5 that subsequently comes into contact with the brine, thus ensuring the safety of the rotating plate 5. The fixing block 32 engages with the fixing groove 30 below the tension rod 29, fixing and limiting the tension rod 29 and the flow-limiting plate 27 to prevent movement. When the flow-limiting plate 27 needs to be used, pulling the pulling rod 31 moves the fixing block 32 out of the fixing groove 30, contacting the flow-limiting plate 27. The flow-limiting plate 27 then moves downwards under gravity. Releasing the pulling rod 31 allows the fourth spring to engage the fixing block 32 with the fixing groove 30 above the tension rod 29, completing the fixation of the flow-limiting plate 27. This ensures that the flow-limiting plate 27 is not easily moved when limiting and buffering the brine flow, making the operation of this device simple and convenient whether or not the flow-limiting plate 27 is used.

[0031] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for energy recovery and utilization during nitrogen-inhibited water-soluble cavity creation, characterized in that, The method includes the following steps: Step 1: Select an underground salt mine of a certain volume; Step 2: In the early stages of underground salt mining, nitrogen is injected to form a nitrogen isolation layer at the top of the cavity, preventing rapid dissolution and thus expanding the lower cavity; Step 3: Establish a connection channel between the ground and underground storage space. The connection channel includes a water injection channel and a brine discharge channel. The brine discharge channel is connected to the water pipe (103) of the power generation device (1). The power generation device (1) includes a base (101), a first generator (102), and a water pipe (103); the outer wall of the water pipe (103) is fixed to the top of the outer wall of the base (101) by a pair of first square plates; a square shell (2) is fixed to the top of the outer wall of the water pipe (103), and the square shell (2) is connected to the water pipe (103); a heat recovery device (3) is fixed to the top of the outer wall of the base (101), and one end of the outer wall of the water pipe (103) is connected to the heat recovery device. The device (3) is connected; the bottom of the outer wall of the first generator (102) is fixed to the top of the outer wall of the base (101); the output end of the first generator (102) is provided with a rotating shaft (4), and one end of the outer wall of the rotating shaft (4) penetrates the outer wall of the square shell (2) and is located inside the square shell (2); a set of rotating plates (5) are fixed to the outer wall of the end of the rotating shaft (4) located inside the square shell (2), and the set of rotating plates (5) are located in the square shell (2) and the water pipe (103) respectively; The rotating shaft (4) is located inside the square shell (2) and its outer side wall is fixedly connected to a third helical gear (13); the inner side wall of the water pipe (103) is rotatably connected to a rotating rod (14) through a first block; a fourth helical gear (15) is fixedly connected to one end of the outer wall of the rotating rod (14), and the fourth helical gear (15) meshes with the third helical gear (13); an annular cleaning plate (16) is rotatably connected to the inner side wall of the water pipe (103); a set of cleaning rods (17) is provided on one side of the outer wall of the annular cleaning plate (16); a first annular rack (18) is fixedly connected to the other side of the outer wall of the annular cleaning plate (16), and the first annular rack (18) is rotatably connected to the inner side wall of the water pipe (103); a fifth gear (19) is fixedly connected to the other end of the outer wall of the rotating rod (14), and the fifth gear (19) meshes with the first annular rack (18); Step 4: Close the valve in the brine discharge channel at night, and then inject water into the water injection channel through the high-pressure pump. During the water injection process, the water pressure will gradually increase to 6-7 MPa. During the continuous water injection to create the cavity, the nitrogen gas that is inhibited will be compressed and stored as energy. Step 5: During the day, open the valve in the brine discharge channel to discharge the brine. At the same time, the high-pressure pump continues to inject water. When the brine is discharged under pressure, the potential energy of the brine flow will be converted into electrical energy through the power generation device (1). The brine impacts the rotating plate (5). While rotating, the rotating shaft (4) drives the rotating rod (14) to rotate through the third helical gear (13) and the fourth helical gear (15). The rotating rod (14) meshes with the first ring rack (18) through the fifth gear (19) to drive the ring cleaning plate (16) and the cleaning rod (17) to rotate, cleaning the salt deposited on the inner wall of the water pipe (103). Step 6: When the high-pressure pump is injecting water, the power is transmitted to the high-pressure pump through the generator (1) to keep the water injection pressure at 6-7 MPa; Step 7: When the brine is discharged through the brine discharge channel, the temperature of the brine is 50-60℃. After the brine is used to generate electricity through the power generation device (1), it enters the heat recovery device (3) so that the heat recovery device (3) can recover and reuse the geothermal energy in the brine.

2. The energy recovery and utilization method in the nitrogen-inhibited water-soluble cavity creation process according to claim 1, characterized in that, The base (101) has a second generator (6) at the top of its outer wall; the output end of the second generator (6) has a first rotating shaft (7); the rotating shaft (4) is fixed to the outer wall of one end outside the square shell (2) with a first bevel gear (8); the outer wall of the first rotating shaft (7) is fixed to a second bevel gear (9), and the first bevel gear (8) and the second bevel gear (9) mesh with each other, and the radius of the first bevel gear (8) is greater than the radius of the second bevel gear (9).

3. The energy recovery and utilization method in the nitrogen-inhibited water-soluble cavity creation process according to claim 1, characterized in that, The rotating plate (5) includes a square plate (501) and a buffer shell (502); one end of the outer wall of the square plate (501) is fixed to the outer wall of the rotating shaft (4); a groove (10) is provided on one side of the outer wall of the square plate (501); the inner wall of the buffer shell (502) is slidably connected to the outer wall of the square plate (501), and one side of the outer wall of the buffer shell (502) is slidably connected to one side of the inner wall of the groove (10), forming a sealed space between the buffer shell (502) and the square plate (501); a pair of first springs are fixedly connected to one side of the outer wall of the square plate (501), and one end of the outer wall of the pair of first springs is fixedly connected to one side of the inner wall of the buffer shell (502), and the first springs are located in the sealed space.

4. The energy recovery and utilization method in the nitrogen-inhibited water-soluble cavity creation process according to claim 2, characterized in that, The bottom of the outer wall of the second generator (6) is slidably connected to the top of the outer wall of the base (101); a pair of limiting grooves (11) are provided on the top of the outer wall of the base (101); a bolt (12) is threadedly connected to the top of the outer wall of the base plate of the second generator (6), and the bottom of the outer wall of the bolt (12) penetrates the base plate of the second generator (6), and the bolt (12) is threadedly connected to the base plate of the second generator (6); the bolt (12) matches the pair of limiting grooves (11).

5. The energy recovery and utilization method in the nitrogen-inhibited water-soluble cavity creation process according to claim 1, characterized in that, One end of the outer wall of the cleaning rod (17) is rotatably connected to one side of the outer wall of the annular cleaning plate (16); the outer wall of the cleaning rod (17) is provided with an annular groove (20); the inner wall of the annular groove (20) is fixedly connected with a sixth gear (21); the inner wall of the water pipe (103) is fixedly connected with a second annular rack (22), and the second annular rack (22) meshes with a set of sixth gears (21).

6. The energy recovery and utilization method in the nitrogen-inhibited water-soluble cavity creation process according to claim 5, characterized in that, The rotating rod (14) includes a circular shell (141) and a circular rod (142); the outer side wall of the circular rod (142) is slidably connected to the inner side wall of the circular shell (141); one end of the outer wall of the fifth gear (19) is fixedly connected to one end of the outer wall of the circular rod (142); a second spring is fixedly connected to one side of the inner wall of the circular shell (141), and one end of the outer wall of the second spring is fixedly connected to one end of the outer wall of the circular rod (142); a trapezoidal block (23) is rotatably connected to the outer side wall of the circular rod (142); a threaded rod (24) is threadedly connected to the outer side wall of the water pipe (103), and one end of the outer wall of the threaded rod (24) penetrates the outer side wall of the water pipe (103) and is located inside the water pipe (103); a movable plate (25) is rotatably connected to one end of the outer wall of the threaded rod (24) located inside the water pipe (103), and one side of the outer wall of the movable plate (25) is slidably connected to the inclined surface of the trapezoidal block (23).

7. The energy recovery and utilization method in the nitrogen-inhibited water-soluble cavity creation process according to claim 1, characterized in that, A first square shell (26) is fixedly connected to the top of the outer wall of the water pipe (103), and the first square shell (26) is connected to the water pipe (103); a flow limiting plate (27) is slidably connected to the inner wall of the first square shell (26), and the flow limiting plate (27) is matched with the water pipe (103); a set of round holes (28) are opened on one side of the outer wall of the flow limiting plate (27); a tension rod (29) is fixedly connected to the top of the outer wall of the flow limiting plate (27), and the top of the outer wall of the tension rod (29) penetrates the first square shell (26), and the tension rod (29) is slidably connected to the first square shell (26).

8. The energy recovery and utilization method in the nitrogen-inhibited water-soluble cavity creation process according to claim 7, characterized in that, A pair of fixing grooves (30) are provided on one side of the outer wall of the tension rod (29); a pulling rod (31) is slidably connected to one side of the outer wall of the first square shell (26) through a connecting plate, and the connecting plate is L-shaped; a fixing block (32) is fixedly connected to one end of the outer wall of the pulling rod (31), and the fixing block (32) matches the fixing groove (30); a fourth spring is fixedly connected to one end of the outer wall of the fixing block (32), and one end of the outer wall of the fourth spring is fixedly connected to one side of the inner wall of the connecting plate.

Images