CN115085230B - 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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- CN115085230B CN115085230B CN202210882012.6A CN202210882012A CN115085230B CN 115085230 B CN115085230 B CN 115085230B CN 202210882012 A CN202210882012 A CN 202210882012A CN 115085230 B CN115085230 B CN 115085230B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 64
- 230000005484 gravity Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000004576 sand Substances 0.000 claims abstract description 194
- 238000005381 potential energy Methods 0.000 claims abstract description 71
- 238000010248 power generation Methods 0.000 claims abstract description 60
- 230000000694 effects Effects 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims abstract description 3
- 238000003860 storage Methods 0.000 claims description 72
- 238000005243 fluidization Methods 0.000 claims description 51
- 230000005611 electricity Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention discloses a quicksand energy storage system utilizing gravity energy storage and an operation method. The system takes fluidized sand as an energy storage working medium, reduces sand flow resistance by repeatedly mixing air and quicksand, and further utilizes compressed air to supply air to lift the fluidized sand to a high position so as to store gravitational potential energy. In the power generation process, the stored sand is fluidized by compressed air, so that the resistance loss and arch bridge effect in the downward flow process of the sand are reduced, the conversion of potential energy into kinetic energy is realized in the falling process of the quicksand, and the sand turbine is further pushed to do work, so that the kinetic energy is converted into electric energy. Through the mode, the invention can solve the problem that the power generation is difficult to continuously supply caused by the intermittence, low density and instability of new energy sources such as wind energy, solar energy and the like.
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
Along with the further improvement of the technical requirements of energy structure transformation and energy conservation and emission reduction, the clean new energy power generation proportion of wind energy power generation, photo-thermal power generation and the like is continuously increased, but because new energy power generation systems such as solar energy, wind energy and the like have strong time-varying characteristics and intermittent characteristics, continuous and stable supply of electric energy cannot be met, different degrees of wind and light abandoning phenomena exist in all 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, discontinuous electric energy generated by solar energy and wind energy is stored and converted into continuous and stable electric energy when needed, and development of an efficient energy storage technology becomes a core and key for solving the problem of new energy consumption and promoting the transformation of a national energy structure.
At present, various energy storage technologies such as pumped storage, concrete potential energy storage, molten salt/hot water heat storage, flywheel, compressor air, battery electrochemical energy storage, super capacitor, electrolytic hydrogen production and energy storage, and hybrid energy storage technologies formed by combining the above energy storage modes have been developed at home and abroad, in the existing large-scale energy storage technology, the pumped storage power generation technology is the most mature, the energy storage power is high, the energy storage time is long, the energy storage cost is low, and the energy storage efficiency is high, but in northwest regions with abundant solar energy and wind energy resources in China, water resources are short, and construction of a pumped storage power station is greatly restricted. The 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 on a large scale in northwest areas, so that the development of a new energy storage technology suitable for northwest water-deficient areas has important significance for the new energy consumption and storage in the areas.
The water resource shortage in northwest areas does not have large-scale pumped storage conditions, but the areas rich in new energy resources such as solar energy and wind energy resources have wide deserts, sand has the characteristics of easy fluidization, high heat stability, easy material taking, large quantity, low price, no need of processing and the like, is an ideal medium for energy storage and heat storage, so that a system for storing energy by utilizing quicksand can be developed, when new energy such as wind and light is abundant in power generation, redundant electric energy is stored at a high position by virtue of a sand conveying device, and when a power station generates less or stops generating, sand flows down from a high position to push a sand turbine to generate power, so that a system for storing energy and generating by utilizing sand potential energy is formed, and a new idea is provided for new energy consumption and storage in northwest areas. Compared with other energy storage modes, sha Chuneng and quicksand heat storage have the advantages of low energy storage cost, high efficiency, capability of realizing large-scale energy storage and power generation and the like, and therefore 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, and the gravity of the sand is fully utilized to store energy, so that the problems that the power generation is difficult to continuously supply due to the intermittence, low density and instability of the new energy such as wind energy and solar energy and the like and the traditional energy storage mode is difficult to realize in the areas with abundant wind energy and solar energy such as northwest areas 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 power generation is difficult to continuously supply caused by intermittence, low density and instability of new energy sources such as wind energy, solar energy and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
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 sand circulation channel is formed by the drift sand lifting system 2, the gravitational potential energy storage system 3, the gravitational potential energy power generation system 5 and the drift sand transportation and storage system 6, the drift sand lifting system 2 and the gravitational potential energy power generation system 5 are vertically arranged, the gravitational potential energy storage system 3 and the drift sand transportation and storage system 6 are horizontally arranged, the gravitational potential energy storage system 3 is arranged at a high position, and the drift sand 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-level 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-level sand fluidization system 4 comprises a first fan 7, a first motor 8 and a first sand fluidization device 9 which are connected; the gravitational potential energy power generation system 5 comprises a descending channel, a sand gate 10, a generator 11 and a sand turbine 12 which are connected in a flowing way, and the sand gate 10 is arranged at the inlet of the descending channel; the quicksand handling and storage system 6 comprises a sand handling belt 13 and a temporary sand storage area 14;
according to the gravity energy storage type quicksand energy storage system, when new energy such as solar energy and wind energy is rich in power generation, the solar power generation and the wind energy power generation are consumed and stored, electric energy generated by the new energy is used for driving a motor 17 to rotate to drive a fan 16 to fluidize desert sand in the desert sand fluidization system 1, and driving an air compressor 15 to work to convert the electric energy into air compression energy, so that the compressed air conveys fluidized sand to a high-level storage platform of the gravity potential energy storage system 3, and 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, and the sand is conveyed to the sand turbine 12 through the gravitational potential energy power generation system 5, so that the sand turbine 12 rotates to drive the generator 11 to generate power, the generated power is conveyed to a power grid, and the sand after the power generation is conveyed to the temporary sand storage area 14 by the sand conveying conveyor belt 13 in the sand conveying and storing system 6.
The system is integrally constructed in an underground pit, wherein a gravitational potential energy storage system 3 is constructed at the pit mouth and is used for storing gravitational potential energy and heat collecting and storing heat energy at a high position.
The second motor 17 in the desert sand fluidization system 1 is coaxially connected with the second fan 16, the outlet of the second fan 16 is connected with the second sand fluidization device 19, and the second sand fluidization device 19 is arranged at the inlet of the sand lifting pipeline 20 in the fluidized sand lifting system 2; the desert sand fluidization system 1 fully mixes the air from the second fan 16 with the desert sand from the temporary sand storage area 14 through the second sand fluidization device 19 to form fluidized sand, thereby overcoming the viscous resistance and the friction resistance between sand grains and reducing the xiao Sha transportation resistance.
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 fluidized sand is transported 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 by the quicksand lifting system 2 to store potential energy.
A first motor 8 in the high-level sand fluidization system 4 is coaxially connected with a first fan 7, an outlet of the first fan 7 is connected with a first sand fluidization device 9, and the first sand fluidization device 9 is arranged at an inlet of a descending channel of the gravitational potential energy power generation system 5; the high-level sand fluidization system 4 is arranged at the inlet of the descending channel of the gravitational potential energy power generation system 5, and the sand is still transported efficiently by adopting a fluidization method when the sand descends from a high level, so that the influence of the granary effect on the power generation continuity is avoided.
The sand gate 10 in the gravitational potential energy power generation system 5 is arranged at the inlet of the descending channel of the gravitational potential energy power generation system, the sand turbine 12 is arranged at the outlet of the descending channel of the gravitational potential energy power generation system, and the sand turbine 12 is coaxially connected with the generator 11; the sand turbine 12 in the gravitational potential energy power generation system 5 is driven to rotate by the quicksand from the gravitational potential energy storage system 3, drives the generator 11 to generate power, and transmits the generated power to a 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 the sand turbine 12, and the tail end of the sand conveying belt is connected with a temporary sand storage area 14; the quicksand conveying and storing system 6 conveys the quicksand which is released from gravitational potential energy to generate electricity to the temporary sand storage area 14 through the sand conveying belt 13 for storage.
The beneficial effects of the invention are as follows:
the new energy power generation and the gravity energy storage are combined, so that the generated energy of all new energy systems can be completely transmitted to the power grid, and the phenomenon of power discarding 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 can be 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 frequency modulation response of the power grid, 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 in accordance with the present invention;
the components in the drawings are marked as follows: 1. a desert sand fluidization system; 2. a quicksand lifting system; 3. a gravitational potential energy storage system; 4. a high-level sand fluidization system; 5. a gravitational potential energy power generation system; 6. a quicksand transportation and storage system; 7. a first fan; 8. a first motor; 9. a first sand fluidizer; 10. a sand flow gate; 11. a generator; 12 sand wheel motor; 13. a sand conveying belt; 14. a temporary sand storage area; 15. an air compressor; 16. a second fan; 17. a second motor; 18. sha Penzui; 19. a second sand fluidization device; sand lifting pipe 20.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
As shown in fig. 1, the present invention is a quicksand energy storage system for storing energy by gravity, comprising: the system 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 gravity energy storage system is integrally built in an underground pit, wherein the gravity potential energy storage system 3 is built at the pit mouth and used for storing gravity potential energy and heat collecting and storing heat energy at a high position.
The desert sand fluidization system 1 includes a second fan 16, a second motor 17, and a second sand fluidization device 19. The desert sand fluidization system 1 fully mixes the air from the fan 16 with the desert sand from the temporary sand storage area 14 through the second sand fluidization device 19 to form fluidized sand, thereby overcoming the viscous resistance and the friction resistance between sand grains and reducing xiao Sha transportation resistance.
The quicksand lifting system 2 comprises an air compressor 15, a sand lifting nozzle 18 and a sand lifting pipeline 20. The fluidized sand is transported 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 by the quicksand lifting system 2 to store potential energy.
The high-level sand fluidization system 4 comprises a first fan 7, a first motor 8 and a first sand fluidization device 9. The high-level sand fluidization system 4 is arranged at the inlet of the descending channel of the gravitational potential energy power generation system 5, and the sand is still transported efficiently by adopting a fluidization method when the sand descends from a high level, so that the influence of the granary effect on the power generation continuity can be avoided.
The gravitational potential energy power generation system 5 comprises a sand flowing gate 10, a generator and a sand turbine 12. The sand turbine 12 in the gravitational potential energy power generation system 5 is driven to rotate by the quicksand from the gravitational potential energy storage system 3, drives the generator 11 to generate power, and transmits the generated power to a power grid.
The quicksand handling and storage system 6 comprises a sand handling belt 13 and a temporary sand storage area 14. The quicksand conveying and storing system 3 conveys the quicksand which is released from gravitational potential energy to generate electricity to a temporary sand storage area 14 through a sand conveying belt 13 for storage.
Operation mode one: when the new energy source generates electricity sufficiently, the system stores energy, and the electric energy generated by the new energy source 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 on the one hand, and the quicksand lifting system 2 converts the electric energy into gravitational potential energy of the sand for storage; 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;
and the second operation mode is as follows: when the new energy is insufficient in power generation, the system releases energy outwards, and the sand is conveyed to the sand turbine 12 through the descending channel of the gravitational potential energy power generation system 5, so that the sand turbine 12 rotates to drive the generator 11 to generate power, the generated power is conveyed to a power grid, and the sand after the power generation is conveyed to the temporary sand storage area 14 by the sand conveying belt 13 in the sand conveying and storing system 6.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (8)
1. The sand-shifting energy storage system utilizing gravity energy storage is characterized by comprising a desert sand fluidization system (1), a sand-shifting 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 sand-shifting transportation and storage system (6); the sand circulation channel is formed by the sand lifting system (2), the gravitational potential energy storage system (3), the gravitational potential energy power generation system (5) and the sand transportation and storage system (6), the sand lifting system (2) and the gravitational potential energy power generation system (5) are vertically arranged, the gravitational potential energy storage system (3) and the sand transportation and storage system (6) are horizontally arranged, the gravitational potential energy storage system (3) is arranged at a high position, and the sand 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-level 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 lifting Sha Penzui (18) and a sand lifting pipeline (20) which are connected; the high-level sand fluidization system (4) comprises a first fan (7), a first motor (8) and a first sand fluidization device (9) which are connected; the gravitational potential energy power generation system (5) comprises a descending channel, a sand gate (10), a generator (11) and a sand turbine (12) which are connected with each other, 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 storage area (14);
according to the gravity energy storage type quicksand energy storage system, when new energy such as solar energy and wind energy is rich in power generation, the solar power generation and the wind energy power generation are consumed and stored, electric energy generated by the new energy is used for driving a motor (17) to rotate to drive a fan (16) to fluidize desert sand in a desert sand fluidization system (1), and driving an air compressor (15) to work to convert the electric energy into air compression energy, so that the compressed air conveys fluidized sand to a high-level storage platform of a gravity potential energy storage system (3), and conversion and storage of electric energy to quicksand potential energy are realized; when the new energy is insufficient in power generation, the system releases energy outwards, sand is conveyed to the sand turbine (12) through the gravitational potential energy power generation system (5), the sand turbine (12) is rotated to drive the power generator (11) to generate power, the generated power is conveyed to a power grid, and the sand after the power generation is conveyed to the temporary sand storage area (14) through the sand conveying belt (13) in the sand conveying and storing system (6).
2. A quicksand energy storage system utilizing gravitational energy storage as claimed in claim 1, wherein the system is integrally built in an underground pit, and wherein a gravitational potential energy storage system (3) is built at the pit mouth for storing gravitational potential energy and heat collecting and storing heat energy in a high position.
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) fully mixes air from the second fan (16) with the desert sand from the temporary sand storage area (14) through the second sand fluidization device (19) to form fluidized sand, so that viscous resistance and friction resistance between sand grains are overcome, and xiao Sha conveying resistance is reduced.
4. A quicksand energy storage system using gravity energy storage according to claim 1, characterized in that the lifting Sha Penzui (18) of the quicksand lifting system (2) is arranged between the sand lifting pipeline (20) and the sand fluidizer (19);
the fluidized sand is transported to a high-level sand storage platform of the gravitational potential energy storage system (3) through a porous compressed air lift Sha Penzui (18) by the quicksand lifting system (2) to store potential energy.
5. A quicksand energy storage system utilizing gravity energy storage according to claim 1, wherein the first motor (8) is coaxially connected with the first fan (7), the outlet of the first fan (7) is connected with the first sand fluidization device (9), and the first sand fluidization device (9) is arranged at the inlet of a descending channel of the gravitational potential energy power generation system (5);
the high-level sand fluidization system (4) is arranged at the inlet of the descending channel of the gravitational potential energy power generation system (5), and the sand is still transported efficiently by adopting a fluidization method when descending from a high level, so that the influence of the granary effect on the power generation continuity is avoided.
6. A sand-shifting energy storage system utilizing gravity energy storage according to claim 1, characterized in that a sand-shifting gate (10) in the gravitational potential energy generating system (5) is arranged at the inlet of a descending channel of the gravitational potential energy generating system, a sand turbine (12) is arranged at the outlet of the descending channel of the gravitational potential energy generating system, and the sand turbine (12) is coaxially connected with a generator (11);
a sand turbine (12) in the gravitational potential energy power generation system (5) is driven to rotate by the quicksand from the gravitational potential energy storage system (3), drives a generator (11) to generate power, and transmits the generated power to a power grid.
7. A sand-shifting energy storage system utilizing gravity energy storage according to claim 1, characterized in that the beginning of the sand-shifting belt (13) in the sand-shifting transportation and storage system (6) is arranged at the lower part of the sand machine (12), and the tail end is connected with the temporary sand storage area (14);
and the quicksand conveying and storing system (6) conveys the quicksand which releases gravitational potential energy to generate electricity to a temporary sand storage area (14) for storage through a sand conveying belt (13).
8. A method of operating a gravity-fed sand storage system according to any one of claims 1 to 7, comprising the following two modes of operation:
operation mode one: when the new energy source is sufficient in power generation, the system stores energy, and the electric energy generated by the new energy source 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 a gravitational potential energy storage system (3), so that the electric energy is converted into gravitational potential energy of the sand through the quicksand lifting system (2) for storage; 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;
and the second operation mode is as follows: when the new energy is insufficient in power generation, the system releases energy outwards, sand is conveyed to the sand turbine (12) through a descending channel of the gravitational potential energy power generation system (5), the sand turbine (12) is enabled to rotate to drive the power generator (11) to generate power, the generated power is conveyed to a power grid, and the sand after the power generation is conveyed to the temporary sand storage area (14) through a sand conveying belt (13) in the sand conveying and storing system (6).
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