CN115085230A - Quicksand energy storage system utilizing gravity energy storage and operation method - Google Patents
Quicksand energy storage system utilizing gravity energy storage and operation method Download PDFInfo
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- 230000005484 gravity Effects 0.000 title claims abstract description 26
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- 238000010248 power generation Methods 0.000 claims abstract description 63
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G3/00—Other motors, e.g. gravity or inertia motors
- F03G3/04—Other motors, e.g. gravity or inertia motors driven by sand or like fluent solid material
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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Abstract
The invention discloses a quicksand energy storage system utilizing gravity energy storage and an operation method thereof. The system takes fluidized sand as an energy storage working medium, the flow resistance of the sand is reduced by repeatedly mixing air and quicksand, and then the fluidized sand is lifted to a high position by utilizing compressed air for air supply to store the gravitational potential energy of the fluidized sand. In the power generation process, the stored sand is fluidized by adopting compressed air, so that the resistance loss and the arch bridge effect in the downward flowing process of the sand are reduced, the potential energy is converted into the kinetic energy in the falling process of the flowing sand, and the sand turbine is further pushed to do work to convert the kinetic energy into the electric energy. Through the mode, the problem that the power generation is difficult to supply continuously due to intermittence, low density and instability of new energy such as wind energy, solar energy and the like can be solved.
Description
Technical Field
The invention relates to the field of new energy power generation and gravity energy storage, in particular to a quicksand energy storage system utilizing gravity energy storage and an operation method.
Background
With the further improvement of energy structure transformation and energy conservation and emission reduction technical requirements, the proportion of clean new energy power generation such as wind power generation and photo-thermal power generation is continuously increased, but because new energy power generation systems such as solar energy and wind energy have strong time-varying characteristics and intermittent characteristics, the continuous and stable supply of electric energy cannot be met, wind abandoning and light abandoning phenomena of different degrees exist in various places, and because wind power and photoelectricity are connected to the internet, a coal-fired unit runs in a low-load state for a long time, so that it is necessary to store discontinuous electric energy generated by solar energy and wind energy and convert the discontinuous electric energy into continuous and stable electric energy when needed, and the development of an efficient energy storage technology becomes a core and a key for solving the problem of new energy consumption and promoting the transformation of national energy structures.
At present, various energy storage technologies such as pumped storage, concrete potential energy storage, fused salt/hot water heat storage, flywheels, compressor air, battery electrochemical energy storage, super capacitors, electrolytic hydrogen production energy storage, and a hybrid energy storage technology formed by combining the energy storage modes are developed at home and abroad. And other energy storage technologies have the problems of high cost, small scale, low technical maturity and the like, and are difficult to develop and apply in a large scale in northwest, so that the development of a new energy storage technology suitable for the water shortage region in northwest has important significance for the consumption and storage of new energy in the region.
The water resource shortage in the northwest area does not have the condition of large-scale water pumping and energy storage, but the areas with rich new energy resources such as solar energy and wind energy resources have wide deserts, and the sand has the characteristics of easy fluidization, high thermal stability and temperature, easy material taking, large quantity, low price, no need of processing and the like, and is an ideal medium for energy storage and heat storage, so that a system for storing energy by using quicksand can be developed, when the new energy resources such as wind, light and the like are rich in power generation, redundant electric energy is lifted to a high position by a sand conveying device to be stored, and when a power station generates less power or stops generating power, the sand pushes a sand turbine to generate power from the high position, so that a system for storing energy and generating power by using potential energy of sand is formed, and a new idea is provided for the absorption and storage of the new energy resources in the northwest area. Compared with other energy storage modes, the sand lifting energy storage and the quicksand heat storage have the advantages of low energy storage cost, high efficiency, large-scale energy storage and power generation and the like, so that technical support can be provided for new energy consumption and storage in northwest regions.
Therefore, the coupling of the new energy and the energy storage system is researched and optimized, sand is used as an energy storage working medium, the gravity of the sand is fully utilized for energy storage, and the problem that the power generation is difficult to continuously supply due to the intermittency, low density and instability of the new energy such as wind energy, solar energy and the like and the problem that the traditional energy storage mode of the wind energy and solar energy rich areas such as northwest areas is difficult to realize can be solved.
Disclosure of Invention
The invention aims to provide a quicksand energy storage system utilizing gravity energy storage and an operation method thereof, which can solve the problem that the power generation is difficult to supply continuously due to the intermittency, low density and instability of new energy such as wind energy, solar energy and the like.
In order to solve the technical problems, the invention adopts the technical scheme that:
a quicksand energy storage system utilizing gravity energy storage comprises a desert sand fluidization system 1, a quicksand lifting system 2, a gravitational potential energy storage system 3, a high-level sand fluidization system 4, a gravitational potential energy power generation system 5 and a quicksand transportation and storage system 6; the quicksand lifting system 2, the gravitational potential energy storage system 3, the gravitational potential energy power generation system 5 and the quicksand transporting and storing system 6 form a sand circulating channel, the quicksand lifting system 2 and the gravitational potential energy power generation system 5 are vertically arranged, the gravitational potential energy storage system 3 and the quicksand transporting and storing system 6 are horizontally arranged, the gravitational potential energy storage system 3 is arranged at a high position, and the quicksand transporting and storing system 6 is arranged at a low position; the desert sand fluidization system 1 is arranged at the inlet of the quicksand lifting system 2, and the high-position sand fluidization system 4 is arranged at the inlet of the gravitational potential energy power generation system 5; the desert sand fluidization system 1 comprises a second fan 16, a second motor 17 and a second sand fluidization device 19 which are connected; the quicksand lifting system 2 comprises an air compressor 15, a sand lifting nozzle 18 and a sand lifting pipeline 20 which are connected; the high-position sand fluidizing system 4 comprises a first fan 7, a first motor 8 and a first sand fluidizing device 9 which are connected; the gravitational potential energy power generation system 5 comprises a descending channel, a sand gate 10, a power generator 11 and a sand wheel machine 12 which are connected in a circulating manner, and the sand gate 10 is arranged at the inlet of the descending channel; the quicksand transporting and storing system 6 comprises a sand transporting belt 13 and a temporary sand storing area 14;
when new energy sources such as solar energy, wind energy and the like are abundant in power generation, the quicksand energy storage system utilizing gravity energy storage consumes and stores solar power generation and wind power generation, on one hand, electric energy generated by the new energy sources is used for driving a motor 17 to rotate in a desert sand fluidization system 1 to drive a fan 16 to fluidize desert sand, on the other hand, an air compressor 15 is driven to work to convert the electric energy into air compression energy, and then the compressed air transports the fluidized sand to a high-level storage platform of a gravity potential energy storage system 3, so that conversion and storage of the electric energy to quicksand potential energy are realized; when the new energy is insufficient in power generation, the system releases energy outwards, the quicksand is conveyed to the sand turbine 12 through the gravitational potential energy power generation system 5, the sand turbine 12 is driven to rotate to drive the generator 11 to generate power, the generated power is conveyed to the power grid, and the sand after power generation is conveyed to the temporary sand storage area 14 through the sand conveying conveyor belt 13 in the quicksand conveying and storage system 6.
The system is integrally constructed in an underground deep pit, wherein the gravitational potential energy storage system 3 is constructed at a pithead and is used for storing gravitational potential energy at a high position and collecting heat energy.
A second motor 17 in the desert sand fluidization system 1 is coaxially connected with a second fan 16, the outlet of the second fan 16 is connected with a second sand fluidization device 19, and the second sand fluidization device 19 is arranged at the inlet of a sand lifting pipeline 20 in the fluidized sand lifting system 2; the desert sand fluidizing system 1 sufficiently mixes air from the second fan 16 with the desert sand from the temporary sand storage area 14 by the second sand fluidizing device 19 to form fluidized sand, thereby reducing sand transport resistance against viscous resistance and frictional resistance between sand particles.
The sand lifting nozzle 18 in the quicksand lifting system 2 is arranged between the sand lifting pipeline 20 and the sand fluidizing device 19;
the quicksand lifting system 2 conveys the fluidized sand to a high-level sand storage platform of the gravitational potential energy storage system 3 through a sand lifting nozzle 18 of porous compressed air to store potential energy.
A first motor 8 in the high-position sand fluidizing system 4 is coaxially connected with a first fan 7, an outlet of the first fan 7 is connected with a first sand fluidizing device 9, and the first sand fluidizing device 9 is arranged at an inlet of a descending channel of the gravitational potential energy power generation system 5; the high-position sand fluidization system 4 is arranged at the inlet of a descending channel of the gravitational potential energy power generation system 5, and when sand descends from a high position, the high-efficiency transportation of the sand is realized by adopting a fluidization method, so that the influence of the granary effect on the continuity of power generation is avoided.
In the gravitational potential energy power generation system 5, a quicksand gate 10 is arranged at the inlet of a descending channel of the gravitational potential energy power generation system, a sand wheel machine 12 is arranged at the outlet of the descending channel of the gravitational potential energy power generation system, and the sand wheel machine 12 is coaxially connected with a generator 11; the sand wheel machine 12 in the gravitational potential energy power generation system 5 is driven by the quicksand from the gravitational potential energy storage system 3 to rotate, and drives the generator 11 to generate power and transmit the power to the power grid.
The starting end of a sand conveying belt 13 in the quicksand conveying and storing system 6 is arranged at the lower part of a sand turbine 12, and the tail end of the sand conveying belt is connected with a temporary sand storing area 14; the quicksand transportation and storage system 6 transports the quicksand which is released completely by gravitational potential energy power generation to a temporary sand storage area 14 for storage through a sand transporting belt 13.
The invention has the beneficial effects that:
1, by combining new energy power generation and gravity energy storage, the generated energy of all new energy systems can be completely transmitted to a power grid, so that the phenomenon of electricity abandonment of any new energy power generation system is avoided;
2, an energy storage system combining sand gravity energy storage is established, so that the overall cost of the energy storage system can be obviously reduced, and the operation safety of the system is improved;
and 3, an energy storage system combining sand gravity energy storage is established, and after large-scale application, the system can be used for realizing power grid frequency modulation response, so that the running quality of the power grid is obviously improved.
Drawings
FIG. 1 is a schematic diagram of a quicksand energy storage system utilizing gravity energy storage according to the present invention;
the parts in the drawings are numbered as follows: 1. a desert sand fluidization system; 2. a quicksand lifting system; 3. a gravitational potential energy storage system; 4. a high sand fluidization system; 5. a gravitational potential energy power generation system; 6. a quicksand transport and storage system; 7. a first fan; 8. a first motor; 9. a first sand fluidizing device; 10. a quicksand gate; 11. a generator; 12 a sand wheel motor; 13. a sand conveying conveyor belt; 14. a temporary sand storage area; 15. an air compressor; 16. a second fan; 17. a second motor; 18. a sand extracting nozzle; 19. a second sand fluidizing means; a sand lifting pipe 20.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
As shown in fig. 1, the present invention is a quicksand energy storage system using gravity energy storage, comprising: the system comprises a desert sand fluidization system 1, a quicksand lifting system 2, a gravitational potential energy storage system 3, a high-position sand fluidization system 4, a gravitational potential energy power generation system 5 and a quicksand transportation and storage system 6. The quicksand energy storage system utilizing gravity energy storage is integrally constructed in an underground deep pit, wherein the gravitational potential energy storage system 3 is constructed at a pithead and used for storing gravitational potential energy at a high position and heat energy in a heat collection manner.
The desert sand fluidizing system 1 comprises a second fan 16, a second motor 17 and a second sand fluidizing device 19. The desert sand fluidizing system 1 sufficiently mixes air from the blower 16 with the desert sand from the temporary sand storage area 14 through the second sand fluidizing device 19 to form fluidized sand, thereby reducing sand transport resistance against viscous resistance and frictional resistance between sand particles.
The quicksand lifting system 2 comprises an air compressor 15, a sand lifting nozzle 18 and a sand lifting pipeline 20. The quicksand lifting system 2 conveys the fluidized sand to an elevated sand storage platform of the gravitational potential energy storage system 3 through a sand lifting nozzle 18 of porous compressed air to store potential energy.
The high-level sand fluidizing system 4 comprises a first fan 7, a first motor 8 and a first sand fluidizing device 9. The high-position sand fluidization system 4 is arranged at the inlet of a descending channel of the gravitational potential energy power generation system 5, and when sand descends from a high position, the high-efficiency transportation of the sand is realized by adopting a fluidization method, so that the influence of the granary effect on the continuity of power generation can be avoided.
The gravitational potential energy power generation system 5 comprises a quicksand gate 10, a generator and a sand wheel machine 12. The sand wheel machine 12 in the gravitational potential energy power generation system 5 is driven by the quicksand from the gravitational potential energy storage system 3 to rotate, and drives the generator 11 to generate power and transmit the power to a power grid.
The quicksand transporting and storing system 6 comprises a sand transporting belt 13 and a temporary sand storage area 14. The quicksand transporting and storing system 3 transports the quicksand which is completely released from the gravitational potential energy power generation to a temporary sand storage area 14 for storage through a sand transporting belt 13.
The first operation mode is as follows: when the new energy is sufficient in power generation, the system stores energy, on one hand, the electric energy generated by the new energy is used for driving an air compressor 15 in the quicksand lifting system 2 to lift sand from a temporary sand storage area 14 in the quicksand conveying and storing system 6 to the gravitational potential energy storage system 3, and the electric energy is converted into gravitational potential energy of the sand through the quicksand lifting system 2 to be stored; on the other hand, the first motor 8 and the second motor 17 are driven to rotate so as to respectively drive the first fan 7 and the second fan 16 to work, and air and sand are fully mixed to form quicksand;
the second operation mode is as follows: when the new energy is insufficient to generate electricity, the system releases energy outwards, the quicksand conveys the sand to a sand wheel machine 12 through a descending channel of the gravitational potential energy power generation system 5, the sand wheel machine 12 rotates to drive a generator 11 to generate electricity, the generated electricity is conveyed to a power grid, and the sand after the electricity generation is transmitted to a temporary sand storage area 14 through a sand conveying belt 13 in the quicksand conveying and storage system 6.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A quicksand energy storage system utilizing gravity energy storage is characterized by comprising a desert sand fluidization system (1), a quicksand lifting system (2), a gravitational potential energy storage system (3), a high-level sand fluidization system (4), a gravitational potential energy power generation system (5) and a quicksand transportation and storage system (6); the sand circulation channel is formed by the quicksand lifting system (2), the gravitational potential energy storage system (3), the gravitational potential energy power generation system (5) and the quicksand transportation and storage system (6), the quicksand lifting system (2) and the gravitational potential energy power generation system (5) are vertically arranged, the gravitational potential energy storage system (3) and the quicksand transportation and storage system (6) are horizontally arranged, the gravitational potential energy storage system (3) is arranged at a high position, and the quicksand transportation and storage system (6) is arranged at a low position; the desert sand fluidization system (1) is arranged at the inlet of the quicksand lifting system (2), and the high-position sand fluidization system (4) is arranged at the inlet of the gravitational potential energy power generation system (5); the desert sand fluidization system (1) comprises a second fan (16), a second motor (17) and a second sand fluidization device (19) which are connected; the quicksand lifting system (2) comprises an air compressor (15), a sand lifting nozzle (18) and a sand lifting pipeline (20) which are connected; the high-position sand fluidizing system (4) comprises a first fan (7), a first motor (8) and a first sand fluidizing device (9) which are connected with each other; the gravity potential energy power generation system (5) comprises a descending channel, a sand gate (10), a power generator (11) and a sand wheel machine (12) which are connected in a packet flow mode, and the sand gate (10) is arranged at the inlet of the descending channel; the quicksand conveying and storing system (6) comprises a sand conveying belt (13) and a temporary sand storing area (14);
when new energy sources such as solar energy, wind energy and the like are abundant in power generation, the quicksand energy storage system using gravity energy storage consumes and stores solar power generation and wind power generation, on one hand, electric energy generated by the new energy sources is used for driving a motor (17) to rotate in a desert sand fluidization system (1) to drive a fan (16) to fluidize desert sand, on the other hand, an air compressor (15) is driven to work to convert the electric energy into air compression energy, and then the compressed air transports the fluidized sand to a high-level storage platform of a gravity potential energy storage system (3), so that conversion and storage of the electric energy to quicksand potential energy are realized; when the new energy is insufficient in power generation, the system releases energy outwards, the quicksand is conveyed to the sand turbine (12) through the gravitational potential energy power generation system (5) to enable the sand turbine (12) to rotate to drive the generator (11) to generate power, the generated power is conveyed to the power grid, and the sand after power generation is conveyed to the temporary sand storage area (14) through the sand conveying conveyor belt (13) in the quicksand conveying and storage system (6).
2. The quicksand energy storage system utilizing gravity energy storage as claimed in claim 1, wherein the system is integrally constructed in an underground pit, wherein the gravitational potential energy storage system (3) is constructed at the pithead for storing gravitational potential energy at high level and heat energy by heat collection.
3. A quicksand energy storage system utilizing gravity energy storage according to claim 1, wherein a second motor (17) in the desert sand fluidization system (1) is coaxially connected with a second fan (16), the outlet of the second fan (16) is connected with a second sand fluidization device (19), and the second sand fluidization device (19) is arranged at the inlet of a sand lifting pipeline (20) in the fluidized sand lifting system (2); the desert sand fluidization system (1) sufficiently mixes air from a second fan (16) with desert sand from a temporary sand storage area (14) through a second sand fluidization device (19) to form fluidized sand, thereby overcoming viscous resistance and frictional resistance between sand particles to reduce sand transport resistance.
4. A quicksand energy storage system utilizing gravity energy storage according to claim 1, characterized in that a sand lifting nozzle (18) in the quicksand lifting system (2) is arranged between the sand lifting pipe (20) and the sand fluidizing device (19);
the quicksand lifting system (2) conveys fluidized sand to a high-position sand storage platform of the gravitational potential energy storage system (3) through a sand lifting nozzle (18) of porous compressed air to store potential energy.
5. The device is characterized in that a first motor (8) is coaxially connected with a first fan (7), the outlet of the first fan (7) is connected with a first sand fluidizing device (9), and the first sand fluidizing device (9) is arranged at the inlet of a descending channel of the gravitational potential energy generating system (5);
the high-position sand fluidization system (4) is arranged at the inlet of a descending channel of the gravitational potential energy power generation system (5), and when sand descends from a high position, the high-efficiency transportation of the sand is realized by adopting a fluidization method, so that the influence of the granary effect on the continuity of power generation is avoided.
6. The quicksand energy storage system utilizing gravity energy storage according to claim 1, wherein a quicksand gate (10) in the gravitational potential energy power generation system (5) is arranged at an inlet of a descending channel of the gravitational potential energy power generation system, a sand wheel machine (12) is arranged at an outlet of the descending channel of the gravitational potential energy power generation system, and the sand wheel machine (12) is coaxially connected with the generator (11);
a sand turbine (12) in the gravitational potential energy power generation system (5) is driven by quicksand from the gravitational potential energy storage system (3) to rotate, and a power generator (11) is driven to generate power and transmit the power to a power grid.
7. A quicksand energy storage system utilizing gravity energy storage as claimed in claim 1, wherein the quicksand transporting and storing system (6) is characterized in that the starting end of the quicksand transporting belt (13) is arranged at the lower part of the sand turbine (12), and the tail end is connected with the temporary sand storage area (14);
the quicksand transportation and storage system (6) transports the quicksand which is completely released by gravitational potential energy power generation to a temporary sand storage area (14) for storage through a sand transportation belt (13).
8. An operation method of a quicksand energy storage system utilizing gravity energy storage as claimed in any one of claims 1 to 7, characterized by comprising the following two operation modes:
the operation mode is as follows: when the new energy is sufficient in power generation, the system stores energy, on one hand, the electric energy generated by the new energy is used for driving an air compressor (15) in the quicksand lifting system (2) to lift sand from a temporary sand storage area (14) in the quicksand conveying and storage system (6) to the gravitational potential energy storage system (3), and the electric energy is converted into gravitational potential energy of the sand through the quicksand lifting system (2) to be stored; on the other hand, the first motor (8) and the second motor (17) are driven to rotate so as to respectively drive the first fan (7) and the second fan (16) to work, and air and sand are fully mixed to form quicksand;
the second operation mode is as follows: when the new energy is insufficient in power generation, the system releases energy outwards, the quicksand is conveyed to a sand wheel machine (12) through a descending channel of the gravitational potential energy power generation system (5) to enable the sand wheel machine (12) to rotate to drive a generator (11) to generate power, the generated power is conveyed to a power grid, and the sand after power generation is conveyed to a temporary sand storage area (14) through a sand conveying belt (13) in the quicksand conveying and storage system (6).
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