Gravity energy storage system and method utilizing abandoned mine shaft

Abstract

The invention discloses a gravity energy storage system and method utilizing an abandoned mine shaft, and relates to the technical field of energy utilization, the gravity energy storage system comprises an energy conversion unit, a vertical shaft lifting unit and a ground weight storage unit; the vertical shaft lifting unit comprises a steel wire rope, an electric permanent magnet lifting tool, a head sheave, a winding drum, a gearbox and a shaft. The ground weight storage unit comprises a transfer device, an arc-shaped slide way, a weight limiting baffle, a drainage baffle, multiple thin cylindrical weights and a supporting column, energy storage is conducted on the system in the electricity trough period, a steel wire rope is driven to be lowered through an electric power generation all-in-one machine, and the multiple weights in a shaft are lifted through an electric permanent magnet lifting tool at one end of the steel wire rope; the energy is conveyed to a plurality of arc-shaped slideways by the transfer device for energy storage; in the peak period of power utilization, the system is subjected to energy release, gravitational potential energy acts to drive the electric power generation all-in-one machine to generate power, and then the gravitational potential energy is converted into electric energy through the transformer substation. The recycling of the abandoned mine shaft is realized, and the problem of storing a plurality of heavy objects is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization, and in particular to a gravity energy storage system and method utilizing an abandoned mine shaft. Background Art

[0002] Large-capacity energy storage facilities can improve the peak-shaving capacity of the power grid and better achieve "peak shaving and valley filling"; they can improve the absorption capacity of new energy power generation, make it possible for distributed power sources to be integrated into the power grid on a large scale, and reduce the proportion of fossil energy consumption. The charging and discharging time and energy storage power of the new gravity energy storage can well meet the needs of the power grid, and have outstanding advantages in improving power quality and smoothing the output of new energy power generation.

[0004] Energy storage, as the most representative flexible adjustment resource, can improve the safety and stability of modern power grids and open up a coordinated operation mode of "source-grid-load-storage". Among them, gravity energy storage, as a physical energy storage method, has an inherently safe system and flexible site selection. It also has the advantages of zero self-discharge rate, large energy storage capacity, and high discharge depth. It has received more and more attention at home and abroad in recent years. Patent 202111561732.4 proposes a gravity energy storage system based on efficient lifting and transfer of multiple objects. The system adopts a car and a heavy object carrier structure. By transferring the heavy object carrier module to the inside of the car, multiple blocks can be lifted and transferred. The presence of the car in this method increases the load-bearing capacity of the lifting mechanism and the supporting mechanism, resulting in excess consumption of electrical energy. Patent 202210240333.6 proposes a gravity energy storage system and method utilizing a wellbore. This method uses an electric generator to drive a drum to rotate and pull a wire rope to lift or lower a heavy object, thereby realizing the use of electricity from the power grid or transmitting electricity to the power grid. However, the problem with this method is that the heavy objects are stacked at the bottom of the wellbore, and the height of the heavy objects is too high, which shortens the lifting space for the heavy objects above.

[0005] The present invention aims at improving the energy storage efficiency by reducing the power consumption of electric generators and lifting mechanisms during the ascent or descent process and increasing the available depth of heavy objects in the mine shaft. A gravity energy storage system and method for lifting multiple thin cylindrical heavy objects in the abandoned mine shaft are proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a gravity energy storage system and method utilizing abandoned mine shafts to solve the problems existing in the above-mentioned prior art, thereby improving the energy storage efficiency from two aspects: reducing the power consumption of the electric generator and the lifting mechanism during the ascent or descent process and increasing the depth of the heavy objects in the mine shaft that can be utilized, thereby realizing the reuse of abandoned mine shafts.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides a gravity energy storage system utilizing an abandoned mine shaft, comprising an energy conversion unit, a shaft hoisting unit and an above-shaft weight storage unit;

[0009] The energy conversion unit includes an integrated electric generator and a substation, and the electric power generated by the integrated electric generator can be transmitted to a nearby substation;

[0010] The vertical shaft hoisting unit includes a steel wire rope, an electric permanent magnetic hoist, a sheave, a derrick, a drum, a gearbox, and a shaft; the derrick is used to support the drum, the gearbox, and the sheave, one end of the steel wire rope passes through the sheave and is connected to the drum, the drum is connected to the gearbox, the gearbox is connected to the electric generator, and the electric generator is connected to the substation; the other end of the steel wire rope is connected to the electric permanent magnetic hoist;

[0011] The heavy object storage unit includes a first transfer device, a second transfer device, an arc-shaped slide, a weight limiting baffle, a thin cylindrical weight and a support column; the arc-shaped slide is supported by the support column and is located at the bottom of the derrick, the head end of the arc-shaped slide is higher than the tail end, the first transfer device is arranged at the head end of the arc-shaped slide, and the second transfer device is arranged at the tail end of the arc-shaped slide, the transfer device is used for thin cylindrical weights, the electric permanent magnetic hoist can adsorb or release the thin cylindrical weights, the thin cylindrical weights are operated between the wellbore and the arc-shaped slide by the electric permanent magnetic hoist, the first transfer device is used to transfer the thin cylindrical weights on the electric permanent magnetic hoist to the arc-shaped slide, the second transfer device is used to transfer the thin cylindrical weights on the arc-shaped slide to the electric permanent magnetic hoist, and the weight limiting baffle can separate two adjacent thin cylindrical weights on the arc-shaped slide.

[0012] Preferably, a wellbore inner wall guide rail is provided on the inner wall of the wellbore, and a sliding groove slidably matched with the wellbore inner wall guide rail is provided on the outer circular side wall of the thin cylindrical weight.

[0013] Preferably, three inner wall guide rails are evenly distributed along the circumferential direction on the inner wall of the shaft, and three rows of a plurality of thin cylindrical weights stacked vertically can be placed in the shaft, and each inner wall guide rail of the shaft can limit a vertical row of thin cylindrical weights.

[0014] Preferably, the electric permanent magnetic hanger includes a balancing device, an indicator light, a power supply cable, an electric permanent magnetic control cabinet and an electric permanent magnetic suction cup. Three of the electric permanent magnetic suction cups are installed on the lower surface of the balancing device, and the indicator light and the electric permanent magnetic control cabinet are provided on the upper surface of the balancing device.

[0015] Preferably, the electric permanent magnetic hoist is connected to a steel wire rope containing a power supply cable, and the steel wire rope is divided into four after passing through a splitter, namely three strands of thin steel wire rope and one power supply cable; the three strands of steel wire are in a triangular pyramid shape and are respectively connected to the balancing device, and the power supply cable is connected to the electric permanent magnetic control cabinet for controlling the electric permanent magnetic suction cup, and the indicator light is used to indicate the magnetic loading and elimination of the suction cup.

[0016] Preferably, the material of the thin cylindrical weight is metal material, and the upper surface of the thin cylindrical weight is provided with three magnetic suction grooves corresponding to the three electro-permanent magnetic suction cups. The thin cylindrical weight is also provided with a plurality of ventilation holes, and the ventilation holes penetrate the thin cylindrical weight along the axial direction.

[0017] Preferably, the gearbox can control the moving speed of the thin cylindrical weight inside the wellbore along the guide rail on the inner wall of the wellbore through a drum.

[0018] Preferably, there are multiple arc-shaped slideways, which are evenly distributed around the outer circumference of the wellhead of the wellbore.

[0019] Preferably, the arc slide includes a primary arc slide, a secondary arc slide, a tertiary arc slide and a diversion baffle; the primary arc slide is a main slide, the secondary arc slide is led out from the inner side near the head end of the primary arc slide, and connected to the inner side of the end of the primary arc slide; the head end of the tertiary arc slide is led out from the inner side of the primary arc slide, and the lead-out position of the tertiary arc slide is lower than the lead-out position of the secondary arc slide; the end of the tertiary arc slide is connected to the inner side of the primary arc slide, and the docking position is higher than the docking position of the end of the secondary arc slide; the diversion baffle is respectively arranged at the head end and the end end of the secondary arc slide and the head end and the end end of the tertiary arc slide, and the diversion baffle is used to guide the thin cylindrical weight to slide or prevent the thin cylindrical weight from moving; the weight limiting baffle is arranged on the primary arc slide, the secondary arc slide and the tertiary arc slide.

[0020] Preferably, the arc slide includes a first-layer arc slide, a second-layer arc slide, a third-layer arc slide and a diversion baffle; the first-layer arc slide is a main slide, the head end of the second-layer arc slide is located directly below the first-layer arc slide, the end of the second-layer arc slide is docked to the inner side of the first-layer arc slide, the head end of the third-layer arc slide is located directly below the second-layer arc slide, the end of the third-layer arc slide is docked to the inner side of the first-layer arc slide, and the docking position of the third-layer arc slide is lower than the docking position of the second-layer arc slide; the diversion baffles are respectively arranged at the ends of the second-layer arc slide and the third-layer arc slide, and the diversion baffles are used to guide the thin cylindrical weight to slide or prevent the thin cylindrical weight from moving; the weight limiting baffles are all arranged on the first-layer arc slide, the second-layer arc slide and the third-layer arc slide.

[0021] Preferably, the weight limit baffle is controlled and monitored by PLC, the weight limit baffle is arranged at the bottom of the arc slide, the arc slide is provided with a through hole for the weight limit baffle to pass through, and the weight limit baffle is controlled to rise or retract by a lifting device.

[0022] Preferably, the first transfer device and the second transfer device are robotic arms.

[0023] Based on the above-mentioned gravity energy storage system using abandoned mine shafts, the present invention also provides a method for gravity energy storage using abandoned mine shafts, including storing energy during the low power load period and generating electricity during the peak power consumption period;

[0024] The steps of the energy storage process are as follows:

[0025] Step 1: starting the electric generator, which supplies power to the gearbox to drive the steel wire rope and the electric permanent magnet hoist on the drum;

[0026] Step 2: The electric permanent magnetic lifting device sequentially grabs the thin cylindrical heavy objects stored inside the wellbore and lifts them from the wellbore to the top of the wellbore;

[0027] Step 3: The first transfer device is located next to the arc-shaped slideway and is responsible for transferring the lifted thin cylindrical heavy object and storing it on the arc-shaped slideway;

[0028] Step 4: before the first thin cylindrical weight slides to the end along the arc-shaped slideway, the first weight limit baffle at the end of the arc-shaped slideway is activated and raised to prevent the first thin cylindrical weight from continuing to slide to the wellhead;

[0029] Step 5: Subsequently, when the second thin cylindrical weight is ready to slide along the arc-shaped slideway, the second weight limit baffle is activated and raised to prevent the second thin cylindrical weight from sliding and colliding with the stored thin cylindrical weight;

[0030] Step 6: Repeat steps 1 to 4 until the last thin cylindrical weight reaches the end of the arc-shaped slideway, at which time the last weight limit baffle near the head end of the arc-shaped slideway will be activated and raised to prevent the last thin cylindrical weight from sliding close to the previous weight;

[0031] Step 7: By following the above process, the heavy object storage work on a single arc slide is completed, and thereby the heavy objects on multiple arc slides are orderly stored, ensuring the efficient and orderly operation of the entire system and completing the storage work of gravitational potential energy;

[0032] The steps of the power generation process are as follows:

[0033] Step 1: In the initial state, the first weight limit baffle at the end of the arc-shaped slideway is in a closed position, allowing the first thin cylindrical weight to slide forward along the arc-shaped slideway;

[0034] Step 2: When the thin cylindrical weight reaches the end edge of the arc-shaped slideway, it is smoothly transferred to the bottom of the electric permanent magnetic hanger at one end of the wire rope by a second transfer device;

[0035] Step 3: Start the electric permanent magnetic lifting device so that the electric permanent magnetic suction cup can absorb the thin cylindrical weight. Under the action of gravity, the thin cylindrical weight moves down along the guide rail on the inner wall of the wellbore. During this process, the weight drives the drum through the wire rope. The drum rotates and passes through the gearbox and the electric generator to convert electricity and transmit it to the substation.

[0036] Step 4: When the thin cylindrical weight falls to the bottom of the wellbore, the wire rope moves up to the wellhead, and the second weight limit baffle is closed;

[0037] Step 5: When the second thin cylindrical weight reaches the end edge of the arc-shaped slideway, the transfer and adsorption process in step 3 is repeated, and gravity energy storage is performed;

[0038] Step 6: Complete the energy release work of the heavy object on a single curved slide by continuously repeating steps 1 to 4;

[0039] Step 7: According to the above process, the energy release work of the heavy objects on the plurality of arc-shaped slideways is completed in sequence to ensure the efficient and orderly operation of the entire system;

[0040] Through the above steps, the energy conversion between gravitational potential energy and electrical energy is completed, and the generated electrical energy is transmitted to the power grid to realize the regulation of power grid energy; the lifting and transfer of heavy objects at the bottom of the shaft are repeated during the next low power load period, so as to realize the purpose of using abandoned mine shafts to lift multiple thin cylindrical heavy objects for gravity energy storage.

[0041] Compared with the prior art, the present invention has achieved the following technical effects:

[0042] (1) Improving energy storage efficiency and safety: The present invention uses multiple thin cylindrical weights as gravity energy storage media, which effectively reduces the load of the electric generator and the shaft hoisting unit in a single operation, while increasing the total mass of the energy storage medium, thereby improving the energy storage efficiency and operational safety of the system.

[0043] (2) Stable power transmission: Through the gearbox control mechanism, the system can accurately control the speed of the cylindrical weight as it descends in the wellbore, ensuring that the weight maintains a uniform speed as much as possible during the descent process, thereby achieving stable power output during the energy storage process.

[0044] (3) Improve system operation efficiency: The system design includes multiple arc-shaped slides, so that after the heavy objects are lifted to the top of the wellbore, they can be placed on the slides in an orderly manner through the transfer device, providing storage space on the well for multiple thin cylindrical heavy objects, effectively improving the overall operation efficiency and energy storage capacity of the system.

[0045] (4) Reduce wear and extend service life: The thin cylindrical weight designed in the present invention is provided with a movable groove on the side and a magnetic groove on the upper surface, which effectively prevents the weight from swinging and hitting the side of the wellbore during lifting or lowering, thereby reducing wear and extending the service life of the weight and the wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a structural schematic diagram of a gravity energy storage system and method utilizing an abandoned mine shaft in the present invention;

[0048] Figure 2 It is a schematic diagram of the structure of the thin cylindrical weight in the present invention;

[0049] Figure 3 It is a schematic diagram of placing a thin cylindrical weight in a single layer plane inside a wellbore in the present invention;

[0050] Figure 4 A schematic diagram of stacking thin cylindrical heavy objects in multiple layers inside a wellbore in the present invention;

[0051] Figure 5 It is a schematic diagram of the pre-magnetic lifting of the electric permanent magnetic hanger and the thin cylindrical weight in the present invention;

[0052] Figure 6 This is a schematic diagram of a continuous lifting state of a heavy object in the present invention;

[0053] Figure 7 It is a schematic diagram of the structure of a single curved slideway in the first embodiment;

[0054] Figure 8 It is a schematic diagram of the structure of multiple arc-shaped slideways distributed on the periphery of the wellhead in the first embodiment;

[0055] Fig. 9 It is a schematic diagram of the structure of a single curved slideway in the second embodiment;

[0056] Fig.10 It is a schematic diagram of the structure of multiple arc-shaped slideways distributed on the periphery of the wellhead in the second embodiment;

[0057] Fig.11 This is a schematic diagram of the structure of a single curved slideway in Embodiment 3;

[0058] Fig.12 It is a schematic diagram of the structure of multiple arc-shaped slideways distributed on the periphery of the wellhead in the third embodiment;

[0059] In the figure: 1. electric generator; 2. drum; 3. gearbox; 4. derrick; 5. arc slide; 6. thin cylindrical weight; 7. weight limit baffle; 8. first transfer device; 9. shaft; 10. electric permanent magnetic hanger; 11. wire rope; 12. support column; 13. sheave; 14. guide rail on the inner wall of shaft; 15. second transfer device; 601. ventilation hole; 602. magnetic groove; 603. slideway ; 101, indicator light; 102, electric permanent magnet control cabinet; 103, balancing device; 104, power supply cable; 105, splitter; 106, thin steel wire rope; 107, electric permanent magnet suction cup; 501, first-level curved slide; 502, second-level curved slide; 503, third-level curved slide; 16, diversion baffle; 511, first-level curved slide; 512, second-level curved slide; 513, third-level curved slide. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] The purpose of the present invention is to provide a gravity energy storage system and method utilizing abandoned mine shafts to solve the problems existing in the prior art.

[0062] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] Embodiment 1:

[0064] In this embodiment, the gravity energy storage system using the abandoned mine shaft is used. Figure 1-Figure 8 As shown, it includes an energy conversion unit, a vertical shaft lifting unit and an above-well heavy object storage unit.

[0065] The energy conversion unit includes an electric power generator 1 and a substation. The electric power generated by the electric power generator 1 can be transmitted to a nearby substation.

[0066] The vertical shaft hoisting unit includes a steel wire rope 11, an electric permanent magnetic hoist 10, a sheave 13, a derrick 4, a drum 2, a gearbox 3, and a shaft 9; the derrick is used to support the drum 2, the gearbox 3 and the sheave 13, one end of the steel wire rope 11 passes through the sheave 13 and is connected to the drum 2, the drum 2 is connected to the gearbox 3, the gearbox 3 is connected to the electric generator 1, and the electric generator 1 is connected to the substation; the other end of the steel wire rope 11 is connected to the electric permanent magnetic hoist 10;

[0067] The heavy object storage unit includes a first transfer device 8, a second transfer device 15, an arc slide 5, a heavy object limit baffle 7, a thin cylindrical heavy object 6 and a support column 12; the arc slide 5 is supported by the support column 12 and is located at the bottom of the derrick 4, the head end of the arc slide 5 is higher than the tail end, the first transfer device 8 is arranged at the head end of the arc slide 5, the second transfer device 15 is arranged at the tail end of the arc slide 5, the transfer device is used for the thin cylindrical heavy object 6, and the permanent magnetic hanger 10 can Adsorb or release the thin cylindrical heavy object 6, the thin cylindrical heavy object 6 runs between the wellbore 9 and the arc slide 5 through the electric permanent magnetic hoist 10, the first transfer device 8 is used to transfer the thin cylindrical heavy object 6 on the electric permanent magnetic hoist 10 to the arc slide 5, the second transfer device 15 is used to transfer the thin cylindrical heavy object 6 on the arc slide 5 to the electric permanent magnetic hoist 10, and the weight limit baffle 7 can separate two adjacent thin cylindrical heavy objects 6 on the arc slide 5.

[0068] In this specific embodiment, a wellbore inner wall guide rail 14 is provided on the inner wall of the wellbore 9, and a slide groove 603 that slides with the wellbore inner wall guide rail 14 is provided on the outer circumferential side wall of the thin cylindrical weight 6. Specifically, three wellbore inner wall guide rails 14 are evenly distributed along the circumferential direction on the inner wall of the wellbore 9, and three rows of thin cylindrical weights 6 stacked vertically can be placed in the wellbore 9, and each wellbore inner wall guide rail 14 can limit a vertical row of thin cylindrical weights 6. In other words, when the thin cylindrical weights 6 are stored inside the wellbore 9, three can be placed in one layer. If the radius of the thin cylindrical weight 6 is r and the radius of the wellbore 9 is R, R / r=2.155 is satisfied as much as possible, so as to make the best use of the wellbore 9 space.

[0069] The use of multiple thin cylindrical weights for energy storage reduces the load of the electric generator on the lifting, transshipment and transportation of the thin cylindrical weights. Furthermore, when a thin cylindrical weight is used for energy storage, when the system releases energy, multiple weights sequentially pull the wire rope from the top of the wellbore along the guide rail inside the wellbore to the bottom and stack at the bottom of the wellbore. It is known that the greater the depth of the wellbore, the greater the energy storage capacity that can be provided by generating electricity in a useful period of time and maximizing the energy storage capacity of the system. Therefore, the use of thin cylindrical weights reduces the height of the weight itself and increases the available depth of the weight moving inside the wellbore, thereby increasing energy storage.

[0070] In this specific embodiment, the electric permanent magnetic hanger 10 includes a balancing device 103, an indicator light 101, a power supply cable 104, an electric permanent magnetic control cabinet 102 and an electric permanent magnetic suction cup 107. Three electric permanent magnetic suction cups 107 are installed on the lower surface of the balancing device 103, and an indicator light 101 and an electric permanent magnetic control cabinet 102 are installed on the upper surface of the balancing device 103.

[0071] In this specific embodiment, the electric permanent magnet hoist 10 is connected to the steel wire rope 11 containing the power supply cable 104. The steel wire rope 11 is divided into four parts after passing through the splitter 105, namely three thin steel wire ropes 106 and one power supply cable 104; the three steel wires are connected to the balancing device 103 in a triangular pyramid shape, and the power supply cable 104 is connected to the electric permanent magnet control cabinet 102 for controlling the electric permanent magnet suction cup 107. The indicator light 101 is used to indicate the magnetic loading and elimination of the suction cup.

[0072] In this specific embodiment, the material of the thin cylindrical weight 6 is a metal material. The upper surface of the thin cylindrical weight 6 is provided with three magnetic grooves 602 corresponding to the three electro-permanent magnetic suction cups 107. The thin cylindrical weight 6 is also provided with a plurality of ventilation holes 601. The ventilation holes 601 penetrate the thin cylindrical weight 6 along the axial direction to reduce the air resistance when the thin cylindrical weight 6 is lifted and dropped, which can reduce the electric energy consumption during the energy storage process to a certain extent, and can also improve the energy-to-electricity conversion efficiency during the energy release process.

[0073] In this specific embodiment, the gearbox 3 can control the moving speed of the thin cylindrical weight 6 inside the wellbore 9 along the wellbore inner wall guide rail 14 through the reel 2.

[0074] In this specific embodiment, there are multiple arc-shaped slideways 5, which are evenly distributed around the outer circumference of the wellhead of the wellbore 9; the curvature of the arc-shaped slideway is as large as possible, which can not only accommodate more thin cylindrical heavy objects, but also reduce the floor space.

[0075] In this specific embodiment, the weight limit baffle 7 is controlled and monitored by PLC. The weight limit baffle is set at the bottom of the arc slide 5. The arc slide 5 is provided with a through hole for the weight limit baffle to pass through. The weight limit baffle is controlled to rise or retract by a hydraulic lifting device. Each PLC can only connect to the corresponding weight limit baffle 7, that is, the first thin cylindrical weight 6 that falls corresponds to the first weight limit baffle 7. When the first thin cylindrical weight 6 reaches the specified position, the second weight limit baffle 7 starts to start. This limit baffle control method mainly relies on the gravity sensing switch. When the thin cylindrical weight 6 starts to slide in the slide, the sensing switch senses the object and transmits it to the controller. The controller lifts the weight limit baffle 7 through a hydraulic or electric lifting device. The weight limit baffle 7 is set at the bottom of the arc slide 5. When not in use, it is hidden in the arc slide 5. When started, it can be raised to a certain height.

[0076] In this specific embodiment, the first transfer device 8 and the second transfer device 15 are robotic arms fixed at the starting end of the arc-shaped slide 5 and equipped with a control system. The control system of the robotic arm can control the movement and rotation direction of the arm, including speed, acceleration and position, to achieve the grabbing and placement of the thin cylindrical heavy object 6.

[0077] The power generation formula is P ss =mvg;

[0078] The power generation during the falling process of heavy objects is divided into the acceleration stage, the uniform speed stage and the deceleration stage;

[0079] In the acceleration stage, the power generation device is adjusted to a higher power generation efficiency, the deceleration device does not work, and the weight is accelerated to quickly reach the maximum allowable speed;

[0080] In the uniform speed stage, the power generation efficiency of the power generation device is reduced, and then the resistance of the reduction device is increased, so that the power and resistance of the heavy object are equal;

[0081] In the deceleration stage, the resistance of the deceleration device and the power generation efficiency of the power generation device are increased;

[0082] Adjust the speed and distance of the weight's movement so that the power is the same at each stage.

[0083] Under ideal conditions, the maximum power calculation formula of the gravity energy storage device is W max =βmgh, where W max is the maximum amount of electrical energy that can be converted from the gravitational potential energy of a weight, m ​​is the mass of the weight, g is the acceleration due to gravity, and β is the conversion coefficient, which indicates the ratio of gravitational potential energy converted into electrical energy, 0<β<1.

[0084] According to safety regulations, the acceleration and deceleration of shaft lifting shall not be unlimited and generally should not be greater than 1.2m / s 2 , usually 0.5~1m / s 2 .

[0085] Based on the gravity energy storage system using the abandoned mine shaft 9 in this embodiment, the method of using the gravity energy storage of the abandoned mine shaft 9 includes storing energy during the low power load period and generating electricity during the peak power consumption period;

[0086] The steps of the energy storage process are as follows:

[0087] Step 1: Start the electric generator 1, which supplies power to the gearbox 3 to drive the steel wire rope 11 and the electric permanent magnet hanger 10 on the drum 2;

[0088] Step 2: The electric permanent magnetic lifting device 10 sequentially grabs the thin cylindrical heavy objects 6 stored inside the wellbore 9 and lifts them from the wellbore 9 to above the wellbore 9;

[0089] Step 3: The first transfer device 8 is located next to the arc-shaped slideway 5 and is responsible for transferring the lifted thin cylindrical heavy object 6 and storing it on the arc-shaped slideway 5;

[0090] Step 4: Before the first thin cylindrical weight 6 slides to the end along the arc slide 5, the first weight limit baffle 7 located at the end of the arc slide 5 is activated and raised to prevent the first thin cylindrical weight 6 from continuing to slide to the wellhead;

[0091] Step 5: Subsequently, when the second thin cylindrical weight 6 is ready to slide along the arc-shaped slideway 5, the second weight limit baffle 7 is activated and raised to prevent the second thin cylindrical weight 6 from sliding and colliding with the stored thin cylindrical weight 6;

[0092] Step 6: Repeat steps 1 to 4 until the last thin cylindrical weight 6 reaches the end of the arc-shaped slideway 5, at which time the last weight limit baffle 7 near the head end of the arc-shaped slideway 5 will be activated and raised to prevent the last thin cylindrical weight 6 from sliding close to the previous weight;

[0093] Step 7: By following the above process, the heavy object storage work on a single curved slide 5 is completed, and thereby the heavy objects on multiple curved slides 5 are orderly stored, ensuring the efficient and orderly operation of the entire system and completing the storage work of gravitational potential energy;

[0094] The steps of the power generation process are as follows:

[0095] Step 1: In the initial state, the first weight limit baffle 7 at the end of the arc-shaped slide 5 is in a closed position, allowing the first thin cylindrical weight 6 to slide forward along the arc-shaped slide 5;

[0096] Step 2: When the thin cylindrical weight 6 reaches the end edge of the arc-shaped slideway 5, it is smoothly transferred to the bottom of the electric permanent magnetic hanger 10 at one end of the wire rope 11 by the second transfer device 15;

[0097] Step 3: Start the electric permanent magnetic lifting device 10, so that the electric permanent magnetic suction cup 107 can absorb the thin cylindrical weight 6. Under the action of gravity, the thin cylindrical weight 6 moves down along the inner wall guide rail 14 of the wellbore. In this process, the weight drives the drum 2 through the wire rope 11. The drum 2 rotates and passes through the gearbox 3 and the electric generator 1 to convert electricity and transmit it to the substation;

[0098] Step 4: When the thin cylindrical weight 6 falls to the bottom of the wellbore 9, the wire rope 11 moves up to the wellhead, and the second weight limit baffle 7 is closed;

[0099] Step 5: When the second thin cylindrical weight 6 reaches the end edge of the arc-shaped slideway 5, the transfer and adsorption process in step 3 is repeated, and gravity energy storage is performed;

[0100] Step 6: By continuously repeating steps 1 to 4, the energy release work of the heavy object on the single arc slide 5 is completed;

[0101] Step 7: According to the above process, the energy release work of the heavy objects on the multiple arc slides 5 is completed in sequence to ensure the efficient and orderly operation of the entire system;

[0102] Through the above steps, the energy conversion between gravitational potential energy and electrical energy is completed, and the generated electrical energy is transmitted to the power grid to realize the regulation of power grid energy; the lifting and transfer of heavy objects at the bottom of the shaft 9 are repeated during the next low power load period, so as to realize the purpose of using the abandoned mine shaft 9 to lift multiple thin cylindrical heavy objects 6 for gravity energy storage.

[0103] like Figure 6 As shown, in order to achieve the continuity of the power supply process, three drums 2 and three sheaves 13 can be set on the derrick 4, and three steel ropes 11 and three pairs of electric permanent magnetic hoists 10 can be matched to continuously complete the descent process of multiple heavy objects, and also improve the efficiency of the heavy objects during the storage process.

[0104] When a heavy object is released from a height, its gravitational potential energy begins to convert into kinetic energy as the object accelerates downward. The kinetic energy of the falling heavy object can be converted into mechanical energy through a mechanical system. The mechanical energy is then converted into electrical energy through a generator.

[0105] In order to prevent the weight from descending too fast during the energy release process, the descending speed of the weight needs to be controlled. For a single working unit, the formula for calculating the rated power of the motor is: P ss =mgv=mgrω.

[0106] Where P SS It represents the rated power of the working unit, m represents the mass of the cylindrical weight, g represents the acceleration of gravity, r represents the radius of the wire rope 11 drum 2 axis, and ω represents the angular velocity of the wire rope 11 drum 2 axis.

[0107] The formula for calculating the air resistance of a heavy object during its fall is:

[0108] F 气阻 =1 / 2ρCSv 2 , where C represents the air resistance coefficient, ρ represents the air density, S represents the windward area of ​​the object, and v represents the relative speed between the object and the air.

[0109] The energy release process of the heavy object falling is divided into the acceleration stage, the uniform speed stage and the deceleration stage;

[0110] Acceleration phase:

[0111] The acceleration of a heavy object during its fall is: a1 = (m gF 气阻 -f1) / m

[0112] The speed of the falling object is: v1 = at1 = (m gF 气阻 -f1)t1 / g

[0113] The distance the weight moves during its fall is:

[0114] x1=1 / 2a1 t1 2 =1 / 2(m gF 气阻 -f1)t1 2 / m

[0115] In the formula, f1 represents the traction force of the generator, and t1 represents the time spent in the stage of accelerating the falling of the heavy object.

[0116] Constant speed stage:

[0117] When the speed of the weight reaches a certain value, it satisfies mgF 气阻-f1=0, at this time, the acceleration of the weight is 0, the speed is at the maximum value, and the weight begins to move at a constant speed, which can stabilize the power generation of the generator. In order to ensure that the weight slides down at a constant speed, avoid the weight sliding down too fast, and protect the safety of the device, an electric motor is required for traction.

[0118] Deceleration phase:

[0119] In order to ensure that the weight is in a safe and stable state when it descends to the bottom of the shaft 9, the descending speed of the weight must be gradually reduced to 0 near the shaft 9. At this time, the resistance of the deceleration device and the power generation efficiency of the power generation device are increased.

[0120] F 气阻 +f2-m g=ma2

[0121] The acceleration of a heavy object during its fall is: a2 = (F 气阻 +f2-mg) / m

[0122] The speed of the falling object is:

[0123] v2=v1-a2 t2=(mg-F 气阻 -f1)t1 / m-(F 气阻 +f2-mg)t2 / m

[0124] In the formula, f2 represents the resistance of the reduction device and the traction force of the generator, and t2 represents the time spent in the deceleration and falling stage of the heavy object.

[0125] When a heavy object falls, the gravitational potential energy generated is E=mgh. The conversion of gravitational potential energy into electrical energy can be achieved by the conversion coefficient β. Therefore, the expression for the electrical energy generated when a heavy object falls is W=βmgh.

[0126] In summary, the power P calculation formula of the system during gravity energy storage is:

[0127] P=W / (t1+t2+t3)

[0128] In the formula, t3 represents the time spent in the uniform falling stage of the weight.

[0129] Embodiment 2:

[0130] The difference between this embodiment and the first embodiment is that:

[0131] like Figure 9-10As shown, the structural changes of the arc slide 5 are to optimize the use of the well space and increase the storage quantity of heavy objects by bifurcating the single slide from the middle. Specifically, the arc slide 5 includes a primary arc slide 501, a secondary arc slide 502, a tertiary arc slide 503 and a diversion baffle 16; the primary arc slide 501 is the main slide, the secondary arc slide 502 is led out from the inner side of the head end of the primary arc slide 501 and docked to the inner side of the end of the primary arc slide 501; the head end of the tertiary arc slide 503 is led out from the inner side of the primary arc slide 501, and the tertiary arc slide 503 is connected to the inner side of the end of the primary arc slide 501; 03's lead-out position is lower than that of the secondary arc slide 502; the end of the tertiary arc slide 503 is docked to the inner side of the primary arc slide 501, and the docking position is higher than the docking position of the end of the secondary arc slide 502; the diversion baffle 16 is respectively arranged at the head and end of the secondary arc slide 502 and the head and end of the tertiary arc slide 503, and the diversion baffle 16 is used to guide the thin cylindrical weight 6 to slide or prevent the thin cylindrical weight 6 from moving; the primary arc slide 501, the secondary arc slide 502, and the tertiary arc slide 503 are all provided with a weight limit baffle 7.

[0132] Specifically, the drainage baffle is designed as an arc-shaped plate structure to adapt to the shape of the arc-shaped slide and ensure that objects can be effectively guided when opened or closed. The baffle body can be made of metal or composite materials to meet the requirements of strength, corrosion resistance and durability. The drainage baffle is connected to the arc-shaped slide through hinges and other connectors. These hinge connectors allow the baffle to rotate on the slide around a fixed point to achieve the opening or closing action. The rotation of the drainage baffle is driven by components such as a motor, a reducer, and a transmission mechanism.

[0133] When the system is storing energy, the electric permanent magnetic hoist 10 grabs the thin cylindrical heavy object 6 stored inside the wellbore 9 and lifts it from the wellbore 9 to the top of the wellbore. The first transfer device 8 is located on the primary arc slide 501, which is responsible for transferring the lifted thin cylindrical heavy object 6 and storing it on the primary arc slide 501. Before the first thin cylindrical heavy object 6 slides to the end along the primary arc slide 501, the first weight limit baffle 7 located at the end of the primary arc slide 501 is activated and raised to prevent the weight 6 from continuing to slide to the wellhead. Subsequently, when the second thin cylindrical heavy object 6 is ready to slide along the primary arc slide 501, the second weight limit baffle 7 is activated and raised to prevent the weight 6 from sliding and colliding with the stored weight. Repeat until the thin cylindrical weight 6 approaches the head end of the three-stage arc slide 503, open the diversion baffle 16 at the head end of the three-stage arc slide 503, and the diversion baffle 16 at the end of the three-stage arc slide 503 in the closed state acts as a weight limit baffle 7 to prevent the weight 6 from continuing to slide onto the first-stage arc slide 501. Then, when the next thin cylindrical weight 6 is ready to slide along the first-stage arc slide 501, the first weight limit baffle 7 on the three-stage arc slide 503 is activated and raised to prevent the weight from hitting the previous weight. Repeat until the thin cylindrical weight 6 is stacked at the head end of the three-stage arc slide 503, and close the diversion baffle 16 at the head end of the three-stage arc slide 503. Continue to stack the heavy objects on the primary arc slide 501. When the thin cylindrical heavy object 6 is stacked close to the head end of the secondary arc slide 502, open the diversion baffle 16 at the head end of the secondary arc slide 502. At this time, the diversion baffle 16 at the end of the secondary arc slide 502 in the closed state acts as a heavy object limit baffle 7 to prevent the heavy object 6 from continuing to slide onto the primary arc slide 501. Then, when the next thin cylindrical heavy object 6 is ready to slide along the primary arc slide 501, the first heavy object limit baffle 7 on the secondary arc slide 502 is activated and raised to prevent the heavy object from hitting the heavy object in front. Repeat until the thin cylindrical heavy object 6 is stacked to the head end of the secondary arc slide 502, and close the diversion baffle 16 at the head end of the secondary arc slide 502. Continue to stack the weights on the primary arc slide 501 until the thin cylindrical weight 6 reaches the end of the primary arc slide 501, at which time the last weight limit baffle 7 near the head end of the primary arc slide 501 will be activated and raised to prevent the weight 6 from sliding close to the previous weight 6. The drainage baffle is designed as an arc plate structure to adapt to the shape of the arc slide and ensure that objects can be effectively guided when opening or closing. The baffle body can be made of metal or composite materials to meet the requirements of strength, corrosion resistance and durability. The drainage baffle is connected to the arc slide by connectors such as hinges. These hinge connectors allow the baffle to rotate on the slide around a fixed point to achieve the action of opening or closing. The rotation of the drainage baffle is driven by components such as a motor, a reducer, and a transmission mechanism.

[0134] By following the above process, the heavy object storage work on a single forked slide can be completed, and then the heavy objects on multiple slides can be stored in an orderly manner, ensuring the efficient and orderly operation of the entire system and completing the storage of gravitational potential energy.

[0135] When the system releases energy, the thin cylindrical weight 6 on the first-level arc slide 501 is released first. After all the weights on the first-level arc slide 501 are lowered into the wellbore, the diversion baffle 16 at the end of the third-level arc slide 503 is opened to release the thin cylindrical weights 6 on the third-level arc slide 503 one by one. After all the weights on the third-level arc slide 503 are lowered into the wellbore, the diversion baffle 16 at the end of the second-level arc slide 502 is opened to release the thin cylindrical weights 6 on the second-level arc slide 502 one by one. After all the weights on the second-level arc slide 502 are lowered into the wellbore, the weight release work of the next forked slide is started, and this process is followed until the weight lowering work of all slides is completed.

[0136] Embodiment three:

[0137] The difference between this embodiment and the first embodiment is that:

[0138] like Figure 11-Figure 12 As shown, the structural change of the arc slide 5 is to set the single-layer slide into multiple layers, and design a multi-layer slide convergence storage method to optimize the use of the well space and increase the number of heavy objects stored; specifically, the arc slide 5 includes a first-layer arc slide 511, a second-layer arc slide 512, a third-layer arc slide 513 and a diversion baffle 16; the first-layer arc slide 511 is the main slide, the head end of the second-layer arc slide 512 is located directly below the first-layer arc slide 511, the end of the second-layer arc slide 512 is connected to the inner side of the first-layer arc slide 511, and the third-layer arc slide 513 is connected to the inner side of the first-layer arc slide 511. The head end is located directly below the second-layer arc slide 512, and the end of the third-layer arc slide 513 is docked to the inner side of the first-layer arc slide 511, and the docking position of the third-layer arc slide 513 is lower than the docking position of the second-layer arc slide 512; the diversion baffle 16 is respectively arranged at the end of the second-layer arc slide 512 and the third-layer arc slide 513, and the diversion baffle 16 is used to guide the thin cylindrical weight 6 to slide or prevent the thin cylindrical weight 6 from moving; the first-layer arc slide 511, the second-layer arc slide 512, and the third-layer arc slide 513 are all provided with a weight limit baffle 7.

[0139] When the system is storing energy, the electric permanent magnetic hoist 10 grabs the thin cylindrical heavy object 6 stored inside the wellbore 9 and lifts it from the wellbore 9 to the top of the wellbore. The first transfer device 8 is located on the first arc-shaped slide 511, and is responsible for transferring the lifted thin cylindrical heavy object 6 and storing it on the first arc-shaped slide 511. Before the first thin cylindrical heavy object 6 slides to the end along the first arc-shaped slide 511, the first weight limit baffle 7 located at the end of the first arc-shaped slide 511 is activated and raised to prevent the weight 6 from continuing to slide to the wellhead. Subsequently, when the second thin cylindrical heavy object 6 is ready to slide along the first arc-shaped slide 511, the second weight limit baffle 7 is activated and raised to prevent the weight 6 from sliding and colliding with the stored weight. Repeat until the thin cylindrical heavy object 6 approaches the head end of the first arc-shaped slide 511. When the next thin cylindrical weight 6 is ready to slide along the second arc slide 512, the drainage baffle 16 at the end of the second arc slide 512 in the closed state acts as a weight limit baffle 7 to prevent the weight 6 from continuing to slide onto the first arc slide 511. Subsequently, when the next thin cylindrical weight 6 continues to slide along the second arc slide 512, the first weight limit baffle 7 on the second arc slide 512 is activated and raised to prevent the weight from hitting the previous weight. This process is repeated until the thin cylindrical weight 6 is stacked at the head end of the second arc slide 512. When the next thin cylindrical weight 6 is ready to slide along the third arc slide 513, the drainage baffle 16 at the end of the third arc slide 513 in the closed state acts as a weight limit baffle 7 to prevent the weight 6 from continuing to slide onto the first arc slide 511. Subsequently, when the next thin cylindrical weight 6 continues to slide along the third arc slide 513, the first weight limit baffle 7 on the third arc slide 513 is activated and raised to prevent the weight from hitting the previous weight. This process is repeated until the thin cylindrical weight 6 is stacked at the head end of the third arc slide 513.

[0140] When the system releases energy, the thin cylindrical weight 6 on the first layer of the arc slide 511 is released first. After all the weights on the first layer of the arc slide 511 are lowered into the wellbore, the diversion baffle 16 at the end of the second layer of the arc slide 512 is opened, and the thin cylindrical weights 6 on the second layer of the arc slide 512 are released one by one. After all the weights on the second layer of the arc slide 512 are lowered into the wellbore, the diversion baffle 16 at the end of the third layer of the arc slide 513 is opened, and the thin cylindrical weights 6 on the third layer of the arc slide 513 are released one by one. After all the weights on the third layer of the arc slide 513 are lowered into the wellbore, the weight release work of the next forked slide is started, and this process is followed until the weight lowering work of all slides is completed.

[0141] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A gravity energy storage system utilizing abandoned mine shafts, characterized in that: It includes an energy conversion unit, a vertical shaft lifting unit and an above-well heavy object storage unit; The energy conversion unit includes an integrated electric generator and a substation, and the electric power generated by the integrated electric generator can be transmitted to a nearby substation; The vertical shaft hoisting unit includes a steel wire rope, an electric permanent magnetic hoist, a sheave, a derrick, a drum, a gearbox, and a shaft; the derrick is used to support the drum, the gearbox, and the sheave, one end of the steel wire rope passes through the sheave and is connected to the drum, the drum is connected to the gearbox, the gearbox is connected to the electric generator, and the electric generator is connected to the substation; the other end of the steel wire rope is connected to the electric permanent magnetic hoist; The heavy object storage unit includes a first transfer device, a second transfer device, an arc-shaped slide, a weight limiting baffle, a thin cylindrical weight and a support column; the arc-shaped slide is supported by the support column and is located at the bottom of the derrick, the head end of the arc-shaped slide is higher than the tail end, the first transfer device is arranged at the head end of the arc-shaped slide, and the second transfer device is arranged at the tail end of the arc-shaped slide, the transfer device is used for thin cylindrical weights, the electric permanent magnetic hoist can adsorb or release the thin cylindrical weights, the thin cylindrical weights are operated between the wellbore and the arc-shaped slide by the electric permanent magnetic hoist, the first transfer device is used to transfer the thin cylindrical weights on the electric permanent magnetic hoist to the arc-shaped slide, the second transfer device is used to transfer the thin cylindrical weights on the arc-shaped slide to the electric permanent magnetic hoist, and the weight limiting baffle can separate two adjacent thin cylindrical weights on the arc-shaped slide.

2. The gravity energy storage system using abandoned mine shafts according to claim 1 is characterized in that: The inner wall of the wellbore is provided with a wellbore inner wall guide rail, and the outer circular side wall of the thin cylindrical weight is provided with a sliding groove that slidably cooperates with the wellbore inner wall guide rail.

3. The gravity energy storage system using abandoned mine shafts according to claim 2 is characterized in that: The inner wall of the shaft is evenly distributed with three shaft inner wall guide rails along the circumferential direction. Three rows of a plurality of thin cylindrical weights stacked vertically can be placed in the shaft, and each shaft inner wall guide rail can limit a vertical row of thin cylindrical weights.

4. The gravity energy storage system using abandoned mine shafts according to claim 3 is characterized in that: The electric permanent magnetic hanger includes a balancing device, an indicator light, a power supply cable, an electric permanent magnetic control cabinet and an electric permanent magnetic suction cup. Three electric permanent magnetic suction cups are installed on the lower surface of the balancing device, and the indicator light and the electric permanent magnetic control cabinet are arranged on the upper surface of the balancing device.

5. The gravity energy storage system using abandoned mine shafts according to claim 4 is characterized in that: The electric permanent magnetic hoist is connected to a steel wire rope containing a power supply cable. The steel wire rope is divided into four after passing through a splitter, namely three strands of thin steel wire rope and one power supply cable. The three strands of steel wire are connected to the balancing device in a triangular pyramid shape. The power supply cable is connected to the electric permanent magnetic control cabinet for controlling the electric permanent magnetic suction cup. The indicator light is used to indicate the magnetic loading and elimination of the suction cup.

6. The gravity energy storage system using abandoned mine shafts according to claim 5 is characterized in that: The material of the thin cylindrical weight is metal material. The upper surface of the thin cylindrical weight is provided with three magnetic suction grooves corresponding to the three electro-permanent magnetic suction cups. The thin cylindrical weight is also provided with a plurality of ventilation holes, and the ventilation holes penetrate the thin cylindrical weight along the axial direction.

7. The gravity energy storage system using abandoned mine shafts according to claim 2 is characterized in that: The gearbox can control the moving speed of the thin cylindrical weight inside the wellbore along the guide rail on the inner wall of the wellbore through the drum.

8. The gravity energy storage system using abandoned mine shafts according to claim 1 is characterized in that: There are multiple arc-shaped slideways, which are evenly distributed around the outer periphery of the wellhead of the wellbore.

9. The gravity energy storage system using abandoned mine shafts according to claim 8 is characterized in that: The arc slide includes a primary arc slide, a secondary arc slide, a tertiary arc slide and a diversion baffle; the primary arc slide is a main slide, the secondary arc slide is led out from the inner side of the head end of the primary arc slide, and connected to the inner side of the end of the primary arc slide; the head end of the tertiary arc slide is led out from the inner side of the primary arc slide, and the lead-out position of the tertiary arc slide is lower than the lead-out position of the secondary arc slide; the end of the tertiary arc slide is connected to the inner side of the primary arc slide, and the docking position is higher than the docking position of the end of the secondary arc slide; the diversion baffle is respectively arranged at the head end and the end end of the secondary arc slide and the head end and the end end of the tertiary arc slide, and the diversion baffle is used to guide the thin cylindrical weight to slide or prevent the thin cylindrical weight from moving; the weight limiting baffle is arranged on the primary arc slide, the secondary arc slide and the tertiary arc slide.

10. The gravity energy storage system using abandoned mine shafts according to claim 8, characterized in that: The arc slide includes a first-layer arc slide, a second-layer arc slide, a third-layer arc slide and a diversion baffle; the first-layer arc slide is a main slide, the head end of the second-layer arc slide is located directly below the first-layer arc slide, the end of the second-layer arc slide is docked to the inner side of the first-layer arc slide, the head end of the third-layer arc slide is located directly below the second-layer arc slide, the end of the third-layer arc slide is docked to the inner side of the first-layer arc slide, and the docking position of the third-layer arc slide is lower than the docking position of the second-layer arc slide; the diversion baffles are respectively arranged at the ends of the second-layer arc slide and the third-layer arc slide, and the diversion baffle is used to guide the thin cylindrical weight to slide or prevent the thin cylindrical weight from moving; the weight limiting baffle is arranged on the first-layer arc slide, the second-layer arc slide and the third-layer arc slide.

11. The gravity energy storage system using abandoned mine shafts according to claim 1 is characterized in that: The weight limit baffle is controlled and monitored by PLC. The weight limit baffle is arranged at the bottom of the arc slide. The arc slide is provided with a through hole for the weight limit baffle to pass through. The weight limit baffle is controlled to rise or retract by a lifting device.

12. The gravity energy storage system using abandoned mine shafts according to claim 1, characterized in that: The first transfer device and the second transfer device are robotic arms.

13. A method for storing energy by gravity in an abandoned mine shaft, using the system for storing energy by gravity in an abandoned mine shaft as claimed in any one of claims 1 to 12, characterized in that: This includes storing energy during low electricity load periods and generating electricity during peak electricity demand periods; The steps of the energy storage process are as follows: Step 1: starting the electric generator, which supplies power to the gearbox to drive the steel wire rope and the electric permanent magnet hoist on the drum; Step 2: The electric permanent magnetic lifting device sequentially grabs the thin cylindrical heavy objects stored inside the wellbore and lifts them from the wellbore to the top of the wellbore; Step 3: The first transfer device is located next to the arc-shaped slideway and is responsible for transferring the lifted thin cylindrical heavy object and storing it on the arc-shaped slideway; Step 4: before the first thin cylindrical weight slides to the end along the arc-shaped slideway, the first weight limit baffle at the end of the arc-shaped slideway is activated and raised to prevent the first thin cylindrical weight from continuing to slide to the wellhead; Step 5: Subsequently, when the second thin cylindrical weight is ready to slide along the arc-shaped slideway, the second weight limit baffle is activated and raised to prevent the second thin cylindrical weight from sliding and colliding with the stored thin cylindrical weight; Step 6: Repeat steps 1 to 4 until the last thin cylindrical weight reaches the end of the arc-shaped slideway, at which time the last weight limit baffle near the head end of the arc-shaped slideway will be activated and raised to prevent the last thin cylindrical weight from sliding close to the previous weight; Step 7: By following the above process, the heavy object storage work on a single arc slide is completed, and thereby the heavy objects on multiple arc slides are orderly stored, ensuring the efficient and orderly operation of the entire system and completing the storage work of gravitational potential energy; The steps of the power generation process are as follows: Step 1: In the initial state, the first weight limit baffle at the end of the arc-shaped slideway is in a closed position, allowing the first thin cylindrical weight to slide forward along the arc-shaped slideway; Step 2: When the thin cylindrical weight reaches the end edge of the arc-shaped slideway, it is smoothly transferred to the bottom of the electric permanent magnetic hanger at one end of the wire rope by a second transfer device; Step 3: Start the electric permanent magnetic lifting device so that the electric permanent magnetic suction cup can absorb the thin cylindrical weight. Under the action of gravity, the thin cylindrical weight moves down along the guide rail on the inner wall of the wellbore. During this process, the weight drives the drum through the wire rope. The drum rotates and passes through the gearbox and the electric generator to convert electricity and transmit it to the substation. Step 4: When the thin cylindrical weight falls to the bottom of the wellbore, the wire rope moves up to the wellhead, and the second weight limit baffle is closed; Step 5: When the second thin cylindrical weight reaches the end edge of the arc-shaped slideway, the transfer and adsorption process in step 3 is repeated, and gravity energy storage is performed; Step 6: Complete the energy release work of the heavy object on a single curved slide by continuously repeating steps 1 to 4; Step 7: According to the above process, the energy release work of the heavy objects on the plurality of arc-shaped slideways is completed in sequence to ensure the efficient and orderly operation of the entire system; Through the above steps, the energy conversion between gravitational potential energy and electrical energy is completed, and the generated electrical energy is transmitted to the power grid to achieve the regulation of power grid energy; The lifting and transfer of heavy objects at the bottom of the shaft will be repeated during the next low electricity load period, so as to achieve the purpose of using the abandoned mine shaft to lift multiple thin cylindrical heavy objects for gravity energy storage.

Images