Gravity energy storage system and method using wood shavings to press cakes

Abstract

The invention discloses a gravitational energy storage system and method using wood shavings to press cakes, and belongs to the technical field of gravitational energy storage. The rotating mechanism comprises an inner cylinder and an outer cylinder which are concentrically arranged from inside to outside, the inner cylinder and the outer cylinder are connected through a plurality of partition plates and form a plurality of potential energy transportation spaces, and the inner cylinder rotates to drive the outer cylinder and the partition plates to rotate; the energy conversion mechanism comprises a hanging bin, a conductive rope, a fixed pulley and a generator, the conductive rope is installed on the fixed pulley, the two ends are connected with the hanging bin and the generator respectively, and the hanging bin is located in the potential energy transportation space of the rotating mechanism; the lowest end of the high-position feeding end is located above the potential energy conveying space and used for conveying the wood shaving pressed cakes to the hanging bin, and the highest end of the low-position discharging end is located below the potential energy conveying space and used for receiving the wood shaving pressed cakes output from the potential energy conveying space. According to the characteristics of wood shaving pressing cakes and the actual situation of a scrap steel packaging factory, the method is not limited by a ground pit well structure and is suitable for various terrains and industrial environments, and the flexibility and universality of an energy storage system are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gravity energy storage, and in particular relates to a gravity energy storage system and an energy storage method utilizing wood shavings cakes. Background Art

[0002] In 2023, the amount of scrap steel recycled increased significantly to about 238 million tons, and is expected to reach 300 million tons in 2030. In this context, scrap steel shavings, a byproduct of metal processing, play a vital role in promoting the recycling of steel resources. Scrap steel shavings are thin sheets produced in the process of steel processing and utilization, mostly in the form of rolls or sheets. If scrap steel shavings are not properly handled, they will not only pollute the environment, but also waste a potential resource. Therefore, through effective recycling and utilization technology, discarded shavings metal can be turned into a valuable resource. At present, scrap steel shavings can be crushed into small pieces by a crusher, and then pressed into cakes for packaging. Shavings cakes are easy to transport, which can shorten the steelmaking process, improve the efficiency and quality of steel production, and realize the recycling of waste resources. Due to the characteristics of small size, high density and good rolling performance, scrap steel plants that produce shavings cakes need to stack shavings cakes in warehouses during the production process of shavings cakes. When selling shavings cakes, they need to be transported, handled and loaded, which consumes a lot of energy. By making good use of the high density, small size and good rolling performance of wood chip cakes and using their gravitational potential energy for energy storage, energy consumption can be greatly reduced. It can also solve the peak-to-valley problem of electricity production and demand fluctuations and the impact of new energy grid connection on the power grid, thereby improving the reliability of power supply in the power system.

[0003] At present, the technical route for energy storage is mainly concentrated on pumped storage, electrochemical storage, supercapacitor storage and other energy storage technologies. Although they have their own advantages, they are difficult to build or do not have the conditions for building large-scale energy storage systems. Solid gravity energy storage has the characteristics of wide geographical adaptability, large storage capacity and environmental friendliness.

[0004] Existing gravity energy storage technologies are mainly divided into ground vertical lifting of heavy objects for energy storage and vertical lifting of heavy objects for energy storage in shafts. For example, the Chinese patent publication number is: CN113460841A, the publication date is: 2021.10.01, and the patent name is: A gravity energy storage system based on shafts and tunnels. The gravity energy storage system proposed in this patent includes a weight carrier, an electric generator and a shaft. There is a supporting beam frame above the shaft. In the energy storage condition, the electric generator drives the winch to pull the weight carrier to the top, and the weight carrier is moved to the upper track through rollers for placement; in the energy release condition, the weight carrier module moves from the upper track to the falling device, and the winch drives the electric generator to generate electricity. When it reaches the bottom of the shaft, the weight carrier is transported to the lower track by rollers for placement. This method can achieve large-scale energy storage, but this method needs to be installed inside the mountain or underground, which is difficult to install and depends on the terrain.

[0005] For another example, the Chinese patent publication number is: CN219771599U, the publication date is: 2023.09.29, and the patent name is: A gravity energy storage device capable of continuous charge and discharge. The application proposes a gravity energy storage system and energy storage method, including an operating platform and a tower crane, the tower crane is placed on the upper surface of the operating platform, the tower crane includes a tower body and a boom, the bottom of the tower body is connected to the upper surface of the operating platform, the upper part of the tower body is connected to the boom, a high yard is arranged around the tower body, and a low yard is arranged around the operating platform. Energy storage is achieved by lifting heavy objects from the low yard to the high yard, and potential energy is achieved by dropping heavy objects from the high yard to the high yard to drive the generator to generate electricity. It can achieve uninterrupted external discharge, ensure the stability of the power grid, is less affected by the terrain, and can improve the peak-shaving and frequency-regulating effects of the energy storage workstation. Compared with the vertical shaft lifting heavy object energy storage technology, this method has a simple structure, but this method requires lifting special heavy blocks to achieve energy storage, which is not very practical for wood chip cake pressing.

[0006] As described in the review, how to realize an energy storage system with simple device structure, low construction cost, high energy storage efficiency and adaptable to the actual production environment of wood chip cake pressing is a technical problem that urgently needs to be solved in the prior art. Summary of the invention

[0007] 1. Problem to be solved

[0008] In view of the problem that the existing scrap steel recycling volume is high but cannot be efficiently utilized, the present invention provides a gravity energy storage system using wood shavings cakes, which can simultaneously solve the problems of the existing gravity energy storage devices being inflexible and complex to build. In combination with the existing production scenarios, the characteristics of wood shavings cakes and the actual situation of scrap steel packaging plants are utilized. It is not limited to the ground pit structure, is applicable to a variety of terrains and industrial environments, and improves the flexibility and universality of the energy storage system. At the same time, it provides an energy storage method to realize the continuous conversion of potential energy into electrical energy, and the converted electrical energy can be quantified.

[0009] 2. Technical solution

[0010] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0011] As a first aspect of the present application, the present application provides a gravity energy storage system using wood chip cakes, including a rotating mechanism, an energy conversion mechanism, a high-position feeding end, and a low-position discharging end:

[0012] The rotating mechanism includes an inner cylinder and an outer cylinder which are concentrically arranged from the inside to the outside. The inner cylinder and the outer cylinder are connected by a plurality of partitions to form a plurality of potential energy transport spaces, wherein the inner cylinder rotates to drive the outer cylinder and the partitions to rotate;

[0013] The energy conversion mechanism includes a hanging nacelle, a conductive rope, a fixed pulley and a generator, wherein the conductive rope is installed on the fixed pulley, and the two ends are respectively connected to the hanging nacelle and the generator, and the hanging nacelle is located in the potential energy transportation space of the rotating mechanism; the hanging nacelle is loaded with wood shavings cakes and moves downward, and through the rotation of the rotating mechanism, pairs of wood shavings cakes are continuously collected, so as to generate electricity through the generator;

[0014] At least one high-position feed end is provided, and the highest end of each high-position feed end is connected to a cake press. The lowest end of the high-position feed end is located above the potential energy transport space, and is used to transport the shavings cake output by at least one cake press to the hanging bin. The highest end of the low-position discharge end is located below the potential energy transport space, and is used to receive the shavings cake output from the potential energy transport space.

[0015] Furthermore, the upper end of the outer cylinder is lower than the upper end of the inner cylinder, and the lowest end of the high-position feed end is connected to the upper end of the outer cylinder, so as to facilitate the wood chip cake to enter the potential energy transport space. Note that this is not a fixed connection, that is, the high-position feed end will not rotate with the outer cylinder.

[0016] Furthermore, the lower end of the outer cylinder is higher than the lower end of the inner cylinder, which facilitates the transport space for the output potential energy of the wood shavings cake.

[0017] Furthermore, a baffle is fixed to the periphery of the outer cylinder. Note that the baffle does not rotate with the outer cylinder. The baffle is provided with an opening for connecting to a low-position discharge end to facilitate the output of the wood shavings cakes.

[0018] Furthermore, a discharge slope is provided at the bottom of the potential energy transport space, wherein the discharge slope is inclined downward, and when the discharge slope rotates to the low-position discharge end, the discharge slope can be connected to the low-position discharge end, so as to facilitate the output of the wood shavings cake.

[0019] Furthermore, the conductive rope includes but is not limited to a steel rope, and a material with a stronger conductivity may be selected if cost is not taken into account.

[0020] Furthermore, the high-position feeding end and the low-position discharging end are both inclined downward, so as to facilitate the wood shavings cake to enter and exit the potential energy transportation space.

[0021] Furthermore, the hanging bin is composed of a bottom plate, and together with the inner tube, the outer tube and the partition plate, forms a shavings cake accommodating position; the hanging bin is lifted by a conductive rope to limit the falling caused by the gravity of the hanging bin itself.

[0022] Furthermore, the silo and high-position feed end are made of aluminum alloy. Firstly, aluminum alloy has a lower friction coefficient. Secondly, aluminum alloy has low cost because its raw material aluminum has more abundant reserves and the processing cost is relatively low. Furthermore, aluminum alloy has good corrosion resistance, is light and high-strength, and has a high strength-to-weight ratio.

[0023] As a second aspect of the present application, the present application provides an energy storage method for the above-mentioned gravity energy storage system, wherein the gravity energy storage system continuously collects the wood shavings cakes by rotating a rotating mechanism, thereby generating electricity through a generator of an energy conversion mechanism, and the rotating mechanism is provided with a plurality of potential energy transport spaces, and a movable hanging bin moves up and down in the potential energy transport space, and a tilted discharge slope is provided at the bottom of the potential energy transport space. Different from the method of storing energy by using fixed energy storage blocks in traditional gravity energy storage equipment, the gravity energy storage system of the present invention can realize continuous energy storage by utilizing the good rolling properties of the wood shavings cakes.

[0024] The steps are as follows: start the rotating mechanism to rotate, and at the same time, roll the wood chip cake pressed by the cake press to the high-position feeding end and enter the hanging bin, the hanging bin moves downward, and the gravitational potential energy of the hanging bin moving downward is converted into electrical energy through the generator through the conductive rope, and when the wood chip cake moves downward to the bottom, it is transported out through the low-position discharging end, and the conversion of gravitational potential energy into electrical energy is completed, and the above steps are repeated to continuously convert electrical energy; wherein, the high-position feeding end is connected to N cake presses, N is a positive integer greater than or equal to 1, and during the system operation time t all Internal power generation energy E T for:

[0025]

[0026]

[0027] A=g·sinα-g·μ 2 ·cosα

[0028] E A =η(m a gh-hm a gμ 1 )

[0029] Where: t s is the system startup time, L is the length of the high-position feed end, α is the angle between the high-position feed end and the horizontal plane, μ 2 is the friction coefficient between the wood chip cake and the high feed end, A is the acceleration of the wood chip cake rolling on the high feed end, tr is the time interval between the adjacent potential energy transport spaces starting to generate electricity, E A is the power generation energy of a single wood chip cake, η is the conversion efficiency of the generator, m a is the weight of a single wood shavings cake, g is the acceleration due to gravity (9.81 m / s on Earth 2 ), μ 1 is the friction coefficient between the nacelle and the rotating mechanism, and h is the height of the potential energy transport space.

[0030] 3. Beneficial effects

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] On the one hand, the present invention innovatively uses wood chip cake as an energy storage medium, combines a rotating mechanism with an energy conversion mechanism, and constructs an efficient, economical, and environmentally friendly gravity energy storage system. By combining scrap steel processing with gravity energy storage, resource recycling and clean energy production are achieved, sustainable development is promoted, and a new path for the development of gravity energy storage technology is opened up;

[0033] On the other hand, the present invention can realize continuous discharge and the discharge amount can be calculated according to time to obtain specific electric energy. By selecting a high-position feed end, a hanging bin, and a rotating mechanism of aluminum alloy, low energy loss and high electric energy conversion rate can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the gravity energy storage system of the present invention;

[0035] Figure 2 A top view of the gravity energy storage system of the present invention;

[0036] Figure 3 It is a working schematic diagram of the energy conversion mechanism in the gravity energy storage system of the present invention;

[0037] Figure 4 It is a partial structural schematic diagram of the cooperation between the high-position feed end and the rotating mechanism in the gravity energy storage system of the present invention;

[0038] Figure 5 It is a schematic diagram of seven cake presses connected in parallel in the gravity energy storage system of the present invention;

[0039] In the figure:

[0040] 1. Rotating mechanism; 11. Inner cylinder; 12. Outer cylinder; 13. Partition; 14. Baffle; 15. Discharge slope; 2. Energy conversion mechanism; 21. Hanging silo; 22. Conductive rope; 23. Fixed pulley; 24. Generator; 3. High-position feeding end; 4. Low-position discharging end. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary workers in the field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal communication of two components, it can be a wireless connection, or it can be a wired connection. For ordinary workers in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] The gravity energy storage system of the present invention includes a rotating mechanism 1, which is connected to the cake press by rotating itself, so as to complete the transfer of the wood chip cake from the cake press to the potential energy transport space in the rotating mechanism 1. When the wood chip cake rolls into the hanging bin 21 in the potential energy transport space, the hanging bin 12 is driven to move downward in the potential energy transport space due to the gravity of the wood chip cake itself. A certain pulley 23 is provided on the upper part of the hanging bin 21 to connect the hanging bin 21 with the generator 24. When the hanging bin 21 moves downward, it drives the generator 24 to generate electricity. When the wood chip cake falls to the bottom of the potential energy transport space, the hanging bin 21 tilts under the action of the discharge slope 15. When the potential energy transport space rotates to the low-position discharge end 4, the wood chip cake rolls down on the tilted hanging bin 21 to the collection warehouse or the loading vehicle, completing the potential energy process and realizing unloading. As the rotating mechanism 1 rotates, the current potential energy transport space continues to rotate after completing unloading, the hanging bin 21 rises and waits for subsequent potential energy operations, and the remaining potential energy transport spaces rotate successively to reach the low-position discharge terminal 4, completing the potential energy and realizing unloading, achieving uninterrupted external discharge, and ensuring the stability of the power grid.

[0046] The present invention discloses a gravity energy storage system utilizing wood chip cakes, which is installed in a wood chip cake factory. Combined with the good rolling properties of the wood chip cakes and the actual production conditions, a large amount of energy consumed in transportation in the original production process is reused by collecting gravitational potential energy, and a potential energy transportation space is provided in combination with a rotating mechanism 1 to complete the transfer and transportation of the wood chip cakes, thereby further reducing the production and transportation costs and improving the level of automation.

[0047] Example

[0048] A gravity energy storage system using wood shavings cakes in this embodiment is as follows Figures 1 to 4 As shown, it includes a rotating mechanism 1, an energy conversion mechanism 2, a high-position feeding end 3 and a low-position discharging end 4.

[0049] Specifically, the rotating mechanism 1 includes an inner cylinder 11 and an outer cylinder 12 which are concentrically arranged from the inside to the outside (in the attached figure, the outer cylinder 12 is in a transparent visible state in order to show the internal potential energy transport space). In order to facilitate the entry and exit of the wood chip cake, the upper end of the outer cylinder 12 is lower than the upper end of the inner cylinder 12, and the lower end of the outer cylinder 12 is higher than the lower end of the inner cylinder 12; the inner cylinder 11 and the outer cylinder 12 are connected by a plurality of partitions 13 to form a plurality of potential energy transport spaces, wherein the rotation of the inner cylinder 11 can drive the outer cylinder 12 and the partitions 13 to rotate. In order to maintain the stability of the wood chip cake, a baffle 14 is fixed to the lower outer portion of the outer cylinder 12. In order to facilitate the output of the wood chip cake in the potential energy transport space, a discharge slope 15 is provided at the bottom of the potential energy transport space, wherein the discharge slope 15 is inclined downward, and when it rotates to the low-position discharge end 4, the discharge slope 15 is connected to the low-position discharge end 4. The energy conversion mechanism 2 includes a hanging silo 21, a conductive rope 22, a fixed pulley 23 and a generator 24, wherein the conductive rope 22 can be a steel cable, installed on the fixed pulley 23, and the two ends are respectively connected to the hanging silo 21 and the generator 24, and the hanging silo 21 is located in the potential energy transportation space of the rotating mechanism 1. The lowest end of the high-position feed end 3 is located above the potential energy transportation space, that is, the lowest end of the high-position feed end 3 is connected to the upper end of the outer cylinder 12, and the highest end of the low-position discharge end 4 is located below the potential energy transportation space, that is, the enclosure 14 is provided with an opening for connecting the low-position discharge end 4. Among them, in order to facilitate the entry and exit of the wood shavings cake, the high-position feed end 3 and the low-position discharge end 4 are both inclined downward.

[0050] In addition, compared with the existing ground vertical lifting heavy object energy storage technology, the energy storage system provided by this embodiment not only has good structural stability and a high safety factor, but also can release energy continuously and has stable output power.

[0051] The energy storage method performed by the gravity energy storage system of this embodiment comprises the following steps: the wood shavings cake is produced in the production workshop by the cake press in the production workshop, the wood shavings cake rolls downward through the high-position feed end 3 with a baffle, the rotating mechanism 1 rotates counterclockwise to direct the potential energy transport space to the high-position feed end 3, and the wood shavings cake rolls into the hanging bin 21 in the potential energy transport space under the action of gravity. The wood shavings cake in the hanging bin 21 drives the hanging bin 21 to move downward due to its own gravity, and during the downward movement of the hanging bin 21, the conductive rope 22 connected to the generator 24 through the fixed pulley 23 is pulled to drive the generator 24 to generate electricity. When the wood shavings block falls to the bottom of the potential energy transport space, the hanging bin 21 presses on the discharge slope 15 to tilt. At this time, the wood shavings block rolls outward due to gravity, but the enclosure 14 at the bottom prevents it from rolling outward until it rotates to the low discharge end 4. Without the obstruction of the enclosure 14, the wood shavings block begins to roll outward through the inclined hanging bin 21, enters the low discharge end 4 and moves to the specified position, ending the potential energy, and the hanging bin 21 rises. The rotating mechanism 1 continues to rotate, transporting the subsequent wood shavings block to the low discharge end 4, and continuing the potential energy conversion into electrical energy. Among them, during the system operation time t all Internal power generation energy E T for:

[0052]

[0053]

[0054] A=g·sinα-g·μ 2 ·cosα

[0055] E A =η(m a gh-hm a gμ 1 )

[0056] Where: N is the number of cake presses connected in parallel, t s is the system startup time, L is the length of the high-position feed end, α is the angle between the high-position feed end and the horizontal plane, μ 2 is the friction coefficient between the wood shavings cake and the high feed end. In this embodiment, aluminum alloy is used to make the high feed end. The friction coefficient between the wood shavings cake and the aluminum alloy is 0.09. A is the acceleration of the wood shavings cake rolling on the high feed end. t r is the time interval between the adjacent potential energy transport spaces starting to generate electricity, E A is the power generation energy of a single wood chip cake, η is the conversion efficiency of the generator which is 92%, m a is the weight of a single wood shavings cake, g is the acceleration due to gravity (9.81 m / s on Earth 2 ), μ 1 is the friction coefficient between the nacelle and the rotating mechanism, and h is the height of the potential energy transport space.

[0057] In this embodiment, Figure 5 The energy storage system is equipped with 7 cake presses in parallel. In the actual production process, one or more cake presses can be equipped according to the production situation. The height of the inner cylinder 11 of the gravity energy storage system is 12 meters, of which the height of the potential energy transportation space is 10 meters. The gravity energy storage system is 5 meters away from the wood shavings cake production plant, and the height of the high-level feed end 3 is 1 meter. According to trigonometric functions

[0058] a 2 =b 0 +c 2 -2bc.cosα

[0059]

[0060] It can be concluded that the length of the high feed end is 5.1 meters and the α angle is 11.3°.

[0061] The time for a single briquetting machine to produce briquette is 15 seconds. The briquette is a cylinder with a mass of 80 kg, a diameter of 30 cm, and a height of 40 cm. According to the inclined plane acceleration formula and the time formula:

[0062] A=g·sinα-g·μ 2 ·cosα

[0063]

[0064] The calculated acceleration of the wood chip cake at the high feed end 3 is A = 1.44 m / s 2 , then when the wood pellets cake enters the high-position feed end 3, the system startup time needs to be set to t s =2.66s, and then it needs to rotate at a potential energy transport space of 15 / 7s to continuously transport the potential energy of the shavings cake. At this time, it is concluded that the speed of the central rotating device should be set to 2.8r / min.

[0065] During system operation time t all = 62.66s, the power generation energy generated by the gravity energy storage system of this embodiment is calculated to be E T According to the formula:

[0066]

[0067] E A =η(m a gh-hm a gμ 1 )

[0068] where μ 1 is the friction coefficient between steel and aluminum alloy, which is 0.16.

[0069] It can be concluded that E T =169818.16J.

[0070] The actual power generation of generator 24 is 165301J according to the generator meter, which is consistent with the calculated E T Basically consistent, accuracy (actual power generation / calculated power generation energy E T ) is 97.34%, indicating that the power generation energy calculation of this application is accurate.

[0071] A single system generates 165301J of electricity per minute, which is about 0.045917kwh. If it runs for 20 hours a day and 320 days a year, the estimated annual power generation is 17632kwh. If multiple factories install this device, it can greatly save energy.

[0072] Factories can choose to connect electricity to the grid or store it in energy storage devices based on actual production conditions.

[0073] The factory can select the arrangement density of the silos 21 according to actual production conditions.

[0074] The factory can achieve better energy utilization by building the wood chip cake production workshop at a higher level.

[0075] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A gravity energy storage system using wood shavings cake, characterized in that: It comprises a rotating mechanism (1), an energy conversion mechanism (2), a high-position feeding end (3) and a low-position discharging end (4): The rotating mechanism (1) comprises an inner cylinder (11) and an outer cylinder (12) which are arranged concentrically from the inside to the outside, wherein the inner cylinder (11) and the outer cylinder (12) are connected by a plurality of partitions (13) to form a plurality of potential energy transport spaces, wherein the inner cylinder (11) rotates to drive the outer cylinder (12) and the partitions (13) to rotate; The energy conversion mechanism (2) comprises a hanging nacelle (21), a conductive rope (22), a fixed pulley (23) and a generator (24), wherein the conductive rope (22) is installed on the fixed pulley (23), and its two ends are respectively connected to the hanging nacelle (21) and the generator (24), and the hanging nacelle (21) is located in the potential energy transport space of the rotating mechanism (1); At least one high-position feeding end (3) is provided, the lowest end of which is located above the potential energy transport space, and is used to transport the wood chip cakes output by at least one cake press to the hanging bin (21); the highest end of the low-position discharging end (4) is located below the potential energy transport space, and is used to receive the wood chip cakes output from the potential energy transport space.

2. A gravity energy storage system using wood shavings cake according to claim 1, characterized in that: The upper end of the outer cylinder (12) is lower than the upper end of the inner cylinder (12), and the lowest end of the high-position feed end (3) is connected to the upper end of the outer cylinder (12).

3. A gravity energy storage system using wood shavings cake according to claim 1, characterized in that: The lower end of the outer cylinder (12) is higher than the lower end of the inner cylinder (12).

4. A gravity energy storage system using wood shavings cake according to claim 3, characterized in that: A baffle (14) is fixed to the periphery of the outer cylinder (12), and the baffle (14) is provided with an opening for connecting to the low-position discharge end (4).

5. The gravity energy storage system using wood chip cakes according to claim 1, characterized in that: A discharge slope (15) is provided at the bottom of the potential energy transport space, wherein the discharge slope (15) is inclined downward, and when the discharge slope (15) rotates to the low-position discharge end (4), the discharge slope (15) is connected to the low-position discharge end (4).

6. The gravity energy storage system using wood chip cakes according to claim 1, characterized in that: The conductive rope (22) comprises a steel cable.

7. The gravity energy storage system using wood shavings cake according to claim 1, characterized in that: The high-position feed end (3) and the low-position discharge end (4) are both inclined downward.

8. The gravity energy storage system using wood shavings cake according to claim 1, characterized in that: The hanging bin is composed of a bottom plate, and together with the inner cylinder (11), the outer cylinder (12) and the partition plate (13) forms a wood shavings cake accommodating position.

9. A gravity energy storage system using wood chip cakes according to any one of claims 1 to 8, characterized in that: The hanging bin (21) and the high-position feeding end (3) are made of aluminum alloy.

10. An energy storage method according to the gravity energy storage system of claim 9, characterized in that: The rotating mechanism (1) is turned on and rotated, and the wood chip cake pressed by the cake press is rolled to the high-position feeding end (3) and enters the hanging bin (21). The hanging bin (21) moves downward, and the gravitational potential energy of the hanging bin (21) is converted into electrical energy through the generator (24) via the conductive rope (22). When the wood chip cake moves downward to the bottom, it is transported out through the low-position discharging end (4). The conversion of gravitational potential energy into electrical energy is completed once, and the above steps are repeated to continuously convert electrical energy. The high-position feeding end (3) is connected to N cake presses, where N is a positive integer greater than or equal to 1. During the system operation time t all Internal power generation energy E T for: E A =η(m a gh-hm a gμ1) Where: t s is the system startup time, t r is the time interval between the adjacent potential energy transport spaces starting to generate electricity, E A is the power generation energy of a single wood chip cake, η is the conversion efficiency of the generator (24), m a is the weight of a single wood chip cake, g is the acceleration due to gravity, μ1 is the friction coefficient between the silo and the rotating mechanism (1), and h is the height of the potential energy transport space.

Images