Bulk fluidized gravity energy storage system

Abstract

The invention discloses a bulk fluidized gravity energy storage system which comprises a power generation well, a hoisting well, a generator set and a hoisting set, the bottoms of the power generation well and the hoisting well are both communicated with an underground roadway, the generator set is installed on the mouth of the power generation well, and the hoisting set is installed on the mouth of the hoisting well. The well bottom of the power generation well is connected with the well bottom of the hoisting well through an underground conveying device installed in an underground roadway, the well mouth of the power generation well is connected with the well mouth of the hoisting well through an overground conveying device installed on the ground, and flow state material balls are stored in the underground conveying device. According to the energy storage system, a high-density material serves as an energy storage medium and is supplemented with a spherical shape, automatic operation of links such as transportation, transfer and storage in the gravity energy storage process is achieved, the loading and unloading efficiency is greatly improved, energy consumption is remarkably reduced, and a more efficient and energy-saving solution is provided for energy storage and power generation.

Description

Technical Field

[0001] The present invention relates to the field of electric power energy technology, and more specifically to a dispersed fluidized gravity energy storage system. Background Art

[0002] As a basic energy source, electricity consumption in modern life, work and industry continues to rise with the development of social civilization. In reality, most of the electricity load is consumed during the day. At night, due to the calmness of various social activities, the proportion of electricity consumption is greatly reduced compared with the daytime, resulting in the phenomenon that power generation equipment and power generation are tight during the day and idle at night.

[0003] Energy storage technology is a common technology to meet this challenge, that is, using reserve energy to generate electricity for social use during the day, and using idle electricity to convert electricity into heat energy, potential energy, etc. at night for storage, to assist in power generation during the day, and play a role in peak load regulation and valley filling. Gravity energy storage is a widely used energy storage technology, but the current gravity energy storage system mostly uses high-density fixed blocks as the medium. During the circulation transportation, this method also requires additional lifting, stacking, transportation, and hanging, which increases the lower use space and reduces the efficiency of energy storage. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a dispersed fluidized gravity energy storage system which improves energy utilization efficiency and reduces energy consumption.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a bulk fluidized gravity energy storage system, comprising a power generation shaft, a lifting shaft, a generator set and a lifting unit, the bottoms of the power generation shaft and the lifting shaft are both connected to the underground tunnel, the generator set is installed on the wellhead of the power generation shaft, the lifting unit is installed on the wellhead of the lifting shaft, the bottom of the power generation shaft is connected to the bottom of the lifting shaft through an underground conveying device installed in the underground tunnel, the wellhead of the power generation shaft is connected to the wellhead of the lifting shaft through a ground conveying device installed on the ground, and fluid material balls are stored in the underground conveying device; when storing energy: the fluid material balls enter the lifting unit through the underground conveying device, the lifting unit lifts the fluid material balls to the wellhead position of the lifting shaft and sends them into the ground conveying device; when generating electricity: the fluid material balls enter the generator set through the ground conveying device, and the fluid material balls move from the wellhead of the power generation shaft to the bottom of the shaft under the action of gravity and drive the generator set to operate.

[0006] In the above-mentioned dispersed fluidized gravity energy storage system, a power generation derrick is installed on the wellhead of the power generation well, the generator set is installed on the ground on one side of the power generation derrick, and a steel cable is wound on the main shaft of the generator set. The steel cable passes around the guide wheel on the power generation derrick and is fixedly connected to the power generation hopper in the power generation well.

[0007] In the above-mentioned bulk fluidized gravity energy storage system, a gate is installed on the bottom of the power generation hopper, and one end of the underground conveying device is located directly below the power generation hopper.

[0008] The above-mentioned dispersed fluidized gravity energy storage system has a lifting derrick installed on the wellhead of the lifting shaft, the lifting unit is installed on the ground on one side of the lifting derrick, and a steel cable is arranged on the lifting unit. The other end of the steel cable passes around the guide wheel on the lifting derrick and is fixedly connected with the lifting bucket in the lifting shaft. A pit that can accommodate the lifting bucket is opened on the ground of the underground tunnel directly below the lifting shaft, and one end of the underground conveying device is located on one side of the pit.

[0009] In the above-mentioned bulk fluidization gravity energy storage system, a gate is installed on one side of the lifting hopper, and one end of the ground conveying device is close to the gate on the side of the lifting hopper.

[0010] In the above-mentioned dispersed fluidized gravity energy storage system, the height of the above-ground conveying device gradually decreases from the wellhead position of the lifting well to the wellhead position of the power generation well; the height of the underground conveying device gradually decreases from the well bottom position of the power generation well to the well bottom position of the lifting well.

[0011] The above-mentioned dispersed fluidized gravity energy storage system, the above-ground conveying device includes a third conveying mechanism, a ground storage and a fourth conveying mechanism. The ground storage is arranged on the ground, one end of the third conveying mechanism extends toward the wellhead of the lifting shaft, the other end of the third conveying mechanism extends into the top of the ground storage, one end of the fourth conveying mechanism is located below the gate at the bottom of the ground storage, and the other end of the fourth conveying mechanism is located at the wellhead of the power generation shaft.

[0012] In the above-mentioned fluidized bulk gravity energy storage system, the underground transmission device includes a storage chamber, a first conveying mechanism and a second conveying mechanism. The storage chamber is opened in the underground tunnel, one end of the first conveying mechanism is located directly below the bottom of the power generation shaft, and the other end of the first conveying mechanism enters the storage chamber. A gate is provided at the bottom of the storage chamber, one end of the second conveying mechanism is located directly below the gate at the bottom of the storage chamber, and the other end of the second conveying mechanism is located below the bottom of the lifting shaft.

[0013] In the above-mentioned dispersed fluidized gravity energy storage system, the shape of the fluidized material ball is spherical.

[0014] The above-mentioned bulk fluidization gravity energy storage system, the fluidized material ball includes a weight block, a spring sheet, a curved plate and a center plate, the weight block is in the shape of a cube, the curved plates are installed at equal intervals around the center plate, there is a gap between two adjacent curved plates, the center plate and the curved plates form a ball plate surface, and a ball plate surface is provided on each plane of the weight block; one end of the spring sheet is fixed to the side wall of the curved plate, and the other end of the spring sheet is connected to the surface of the weight block.

[0015] The technical solution of the present invention achieves the following beneficial technical effects:

[0016] The energy storage system in the present invention uses high-density materials as energy storage media and a spherical shape to achieve automated operations in transportation, transfer, storage and other links during gravity energy storage. It not only greatly improves loading and unloading efficiency, but also significantly reduces energy consumption, providing a more efficient and energy-saving solution for energy storage and power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of embodiment 1 of the dispersed fluidized gravity energy storage system of the present invention;

[0018] Figure 2 Schematic diagram of Example 2 of the dispersed fluidized gravity energy storage system of the present invention;

[0019] Figure 3 A schematic cross-sectional view of a fluidized material ball in the bulk fluidized gravity energy storage system of the present invention;

[0020] Figure 4 A schematic top view of a fluidized material ball in the dispersed fluidized gravity energy storage system of the present invention.

[0021] The reference numerals in the figure are as follows: 1-power shaft; 2-power derrick; 3-generator set; 4-power hopper; 5-underground tunnel; 6-first conveying mechanism; 7-fluid material ball; 71-weight block; 72-spring piece; 73-arc plate; 74-center plate; 8-storage chamber; 9-second conveying mechanism; 10-lifting shaft; 11-lifting derrick; 12-lifting unit; 13-lifting hopper; 14-third conveying mechanism; 15-ground storage; 16-fourth conveying mechanism; 17-inclined shaft. DETAILED DESCRIPTION

[0022] Example 1

[0023] The bulk fluidized gravity energy storage system in this embodiment is as follows: Figure 1As shown, energy is stored by using vertical shafts and underground tunnels. Both the power generation shaft 1 and the lifting shaft 10 are vertical shafts. The bottoms of the power generation shaft 1 and the lifting shaft 10 are connected to the underground tunnel 5. The generator set 3 is installed on the wellhead of the power generation shaft 1. A power generation derrick 2 is installed on the wellhead of the power generation shaft 1. The generator set 3 is installed on the ground on one side of the power generation derrick 2. A steel cable is wound on the main shaft of the generator set 3. The steel cable is fixedly connected to the power generation hopper 4 in the power generation shaft 1 after passing through the guide wheel on the power generation derrick 2; the lifting unit 12 is installed on the wellhead of the lifting shaft 10. A lifting derrick 11 is installed on the wellhead of the lifting shaft 10. The lifting unit 12 is installed on the ground on one side of the lifting derrick 11. A steel cable is arranged on the lifting unit 12. The other end of the steel cable is fixedly connected to the lifting hopper 13 in the lifting shaft 10 after passing through the guide wheel on the lifting derrick 11.

[0024] like Figure 1 As shown, the bottom of the power generation shaft 1 is connected to the bottom of the lifting shaft 10 through an underground conveying device installed in an underground tunnel 5. The height of the underground conveying device gradually decreases from the bottom of the power generation shaft 1 to the bottom of the lifting shaft 10. It can be a step-by-step transition or an inclined decrease, preferably an inclined one. The underground conveying device includes a storage chamber 8, a first conveying mechanism 6, and a second conveying mechanism 9. The storage chamber 8 is opened in the underground tunnel 5 and is located between the power generation shaft 1 and the lifting shaft 10. One end of the first conveying mechanism 6 is located directly below the bottom of the power generation shaft 1. A gate is installed on the bottom of the power generation hopper 4. The first conveying mechanism 6 is located directly below the power generation hopper 4. After the valve on the power generation hopper 4 is opened, the fluid material ball 7 falls onto the first conveying mechanism 6 under the action of gravity. The first conveying mechanism The other end of 6 enters the storage chamber 8, and a gate is provided at the bottom of the storage chamber 8. One end of the second conveying mechanism 9 is located directly below the gate at the bottom of the storage chamber 8, and the other end of the second conveying mechanism 9 is located below the bottom of the lifting shaft 10. A pit that can accommodate a lifting hopper 13 is opened on the ground of the underground tunnel 5 directly below the lifting shaft 10. When the lifting hopper 13 enters the pit, the second conveying mechanism 9 can directly convey the fluid material ball 7 into the opening at the top of the lifting hopper 13.

[0025] The height of the above-ground conveying device gradually decreases from the wellhead position of the lifting shaft 10 to the wellhead position of the power generation shaft 1. The above-ground conveying device includes a third conveying mechanism 14, a ground storage 15 and a fourth conveying mechanism 16. The ground storage 15 is arranged on the ground between the power generation shaft 1 and the lifting shaft 10. One end of the third conveying mechanism 14 extends toward the wellhead direction of the lifting shaft 10 and is supported on the lifting derrick 11. The other end of the third conveying mechanism 14 extends into the top of the ground storage 15. One end of the fourth conveying mechanism 16 is located below the gate at the bottom of the ground storage 15, and the other end of the fourth conveying mechanism 16 is located at the wellhead position of the power generation shaft 1. A gate is installed on one side of the lifting hopper 13. The end of the third conveying mechanism 14 is close to the gate on the side of the lifting hopper 13. When the gate on the side of the lifting hopper 13 is opened, the fluid material ball 7 rolls onto the third conveying mechanism 14. The first conveying mechanism 6 , the second conveying mechanism 9 , the third conveying mechanism 14 and the fourth conveying mechanism 16 may be conveyor belts, or inclined tracks or pipes.

[0026] The wellhead of the power generation well 1 is connected to the wellhead of the lifting well 10 through a ground conveying device installed on the ground, and the fluid material ball 7 is stored in the underground conveying device; when actually storing energy: the gate at the bottom of the storage chamber 8 is opened, the fluid material ball 7 moves to the second conveying mechanism 9, and moves along the second conveying mechanism 9 to the lifting hopper 13, then the gate at the bottom of the storage chamber 8 is closed, the lifting unit 12 drives the lifting hopper 13 to move upward to the wellhead position, and then the gate on the side wall of the lifting hopper 13 is opened, the fluid material ball 7 enters the third conveying mechanism 14 and rolls into the ground storage 15 to complete the energy storage.

[0027] During power generation: the gate at the bottom of the ground storage 15 is opened, the fluid material ball 7 falls onto the fourth conveying mechanism 16, and the fluid material ball 7 enters the power generation hopper 4 through the fourth conveying mechanism 16. Then the ground storage 15 is closed, and under the action of gravity, the power generation hopper 4 moves downward and drives the generator set 3 to operate, thereby generating electricity.

[0028] like Figure 3-4As shown, specifically, the shape of the fluid material ball 7 is spherical, and the fluid material ball 7 includes a weight block 71, a spring piece 72, a curved plate 73 and a center plate 74. The weight block 71 is in the shape of a cube, and the curved plates 73 are installed at equal intervals around the center plate 74. There is a gap between two adjacent curved plates 73. The center plate 74 and the curved plates 73 form a ball plate surface, and a ball plate surface is provided on each plane of the weight block 71; one end of the spring piece 72 is fixed to the side wall of the curved plate 73, and the other end of the spring piece 72 is connected to the surface of the weight block 71. When stacking, the ball plate surface composed of the curved plate 73 and the spring piece 72 can be compressed to a certain extent, and the fluid material ball 7 becomes a shape close to a cube, thereby increasing the stacking density and reducing the gap. When rolling, the curved plate 73 and the spring piece 72 restore their shapes, so that the fluid material ball 7 can roll freely.

[0029] Example 2

[0030] The bulk fluidized gravity energy storage system in this embodiment is different from that in Embodiment 1 in that: Figure 2 As shown, the lifting shaft 10 adopts an inclined shaft 17, and a second conveying mechanism 9 is arranged along the shaft direction in the inclined shaft 17 to replace the lifting unit 12 in Example 1. The second conveying mechanism 9 is located at one end of the wellhead and is connected to the third conveying mechanism to form a material channel.

[0031] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. The bulk fluidized gravity energy storage system is characterized by: The invention comprises a power generation shaft (1), a lifting shaft (10), a power generation unit (3) and a lifting unit (12); the bottoms of the power generation shaft (1) and the lifting shaft (10) are both connected to an underground tunnel (5); the power generation unit (3) is installed on the wellhead of the power generation shaft (1); the lifting unit (12) is installed on the wellhead of the lifting shaft (10); the bottom of the power generation shaft (1) is connected to the bottom of the lifting shaft (10) via an underground transmission device installed in the underground tunnel (5); the wellhead of the power generation shaft (1) is connected to the bottom of the lifting shaft (10) via an above-ground transmission device installed on the ground. The device is connected to the wellhead of the lifting well (10), and the underground conveying device stores fluid material balls (7); when storing energy, the fluid material balls (7) enter the lifting unit (12) through the underground conveying device, and the lifting unit (12) lifts the fluid material balls (7) to the wellhead position of the lifting well (10) and sends them to the ground conveying device; when generating electricity, the fluid material balls (7) enter the generator set (3) through the ground conveying device, and the fluid material balls (7) move from the wellhead of the power generation well (1) to the bottom of the well under the action of gravity and drive the generator set (3) to operate.

2. The dispersed fluidized gravity energy storage system according to claim 1, characterized in that: A power generation derrick (2) is installed on the wellhead of the power generation well (1), and the power generation unit (3) is installed on the ground on one side of the power generation derrick (2). A steel cable is wound on the main shaft of the power generation unit (3), and the steel cable passes around the guide wheel on the power generation derrick (2) and is fixedly connected to the power generation hopper (4) in the power generation well (1).

3. The dispersed fluidized gravity energy storage system according to claim 2, characterized in that: A gate is installed on the bottom of the power generation hopper (4), and one end of the underground conveying device is located directly below the power generation hopper (4).

4. The dispersed fluidized gravity energy storage system according to claim 1, characterized in that: A lifting derrick (11) is installed on the wellhead of the lifting shaft (10), and the lifting unit (12) is installed on the ground on one side of the lifting derrick (11). A steel cable is arranged on the lifting unit (12), and the other end of the steel cable passes around the guide wheel on the lifting derrick (11) and is fixedly connected to the lifting hopper (13) in the lifting shaft (10). A pit for accommodating the lifting hopper (13) is opened on the ground of the underground tunnel (5) directly below the lifting shaft (10), and one end of the underground conveying device is located on one side of the pit.

5. The dispersed fluidized gravity energy storage system according to claim 4, characterized in that: A gate is installed on one side of the lifting hopper (13), and one end of the ground conveying device is close to the gate on the side of the lifting hopper (13).

6. The dispersed fluidized gravity energy storage system according to claim 1, characterized in that: The height of the above-ground conveying device gradually decreases from the wellhead position of the lifting well (10) to the wellhead position of the power generation well (1); the height of the underground conveying device gradually decreases from the well bottom position of the power generation well (1) to the well bottom position of the lifting well (10).

7. The dispersed fluidized gravity energy storage system according to claim 6, characterized in that: The ground conveying device comprises a third conveying mechanism (14), a ground storage (15) and a fourth conveying mechanism (16); the ground storage (15) is arranged on the ground; one end of the third conveying mechanism (14) extends toward the wellhead of the lifting shaft (10); the other end of the third conveying mechanism (14) extends into the top of the ground storage (15); one end of the fourth conveying mechanism (16) is located below the gate at the bottom of the ground storage (15); and the other end of the fourth conveying mechanism (16) is located at the wellhead of the power generation shaft (1).

8. The dispersed fluidized gravity energy storage system according to claim 6, characterized in that: The underground conveying device comprises a storage chamber (8), a first conveying mechanism (6) and a second conveying mechanism (9); the storage chamber (8) is opened in the underground tunnel (5); one end of the first conveying mechanism (6) is located directly below the bottom of the power generation shaft (1); the other end of the first conveying mechanism (6) enters the storage chamber (8); a gate is provided at the bottom of the storage chamber (8); one end of the second conveying mechanism (9) is located directly below the gate at the bottom of the storage chamber (8); and the other end of the second conveying mechanism (9) is located below the bottom of the lifting shaft (10).

9. The dispersed fluidized gravity energy storage system according to claim 1, characterized in that: The shape of the fluid material ball (7) is spherical.

10. The dispersed fluidized gravity energy storage system according to claim 9, characterized in that: The fluid material ball (7) comprises a weight block (71), a spring sheet (72), a curved plate (73) and a center plate (74); the weight block (71) is in the shape of a cube; the curved plates (73) are installed at equal intervals around the center plate (74); there is a gap between two adjacent curved plates (73); the center plate (74) and the curved plates (73) form a ball plate surface; each plane of the weight block (71) is provided with a ball plate surface; one end of the spring sheet (72) is fixed to the side wall of the curved plate (73); the other end of the spring sheet (72) is connected to the surface of the weight block (71).

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