CN115313669A - Cross-season energy storage method and system - Google Patents

Abstract

The embodiment of the invention provides a cross-season energy storage method and a cross-season energy storage system. The method is characterized in that solar energy is converted into electric energy in the solar power generation process, the electric energy is converted into gravitational potential energy through the water pump to be stored, the energy of a solar system is converted into heat energy in the solar heat storage process to be stored in the heat storage water tank, the water in the lower reservoir is lifted into the upper reservoir through the water pump in the hydroenergy energy storage process, and the residual energy is converted into storable gravitational potential energy. According to the processing scheme, the solar photovoltaic photo-thermal integrated system and the pumped storage system are coupled and built by relying on natural mountains, the reliability of the pumped storage system is guaranteed, meanwhile, the reservoir which is an artificially built heat accumulator is used for storing heat, the problems of instability and timeliness of the solar system are solved, accordingly, the complementary utilization of various renewable energy sources is achieved, and convenience is provided for heating in cities and towns while the power generation requirement is met.

Description

A method and system for interseasonal energy storage

technical field

The invention relates to the field of new energy technology, in particular to a method and system for interseasonal energy storage.

Background technique

Pumped storage technology is an emerging energy storage technology with great development potential. This technology is to use electric power to pump water during the low period of electricity consumption, and store the surplus electricity as water potential energy; during the peak period of electricity consumption, the water turbine unit is used to generate electricity, so as to realize the complementarity of electric energy and water potential energy. Its advantages are huge energy storage, long storage period and little environmental pollution.

my country is rich in solar energy resources. The total annual radiation in the northern region ranks at the national Class III level, the number of sunshine is 2200~3000h, and the total acceptable solar radiation per square meter in a year is 5061MJ~5852MJ. However, the solar energy system is greatly affected by the external environment, has poor stability and low utilization rate. In order to make full use of solar energy, improve heating conditions, and eliminate the instability of solar energy, it is necessary to further optimize the utilization of solar energy.

Based on this, the present invention couples the interseasonal heat storage of the solar heat pump with the pumped storage technology, and utilizes the huge heat carrier of the pumped storage reservoir to realize the heat storage and utilization of the solar energy.

Contents of the invention

In view of this, embodiments of the present invention provide a method and system for inter-seasonal energy storage, which at least partially solve the problems existing in the prior art.

In the first aspect, the embodiment of the present invention provides a cross-season energy storage method, including the following process:

The process of solar power generation, the specific implementation process is: the photovoltaic photothermal integrated system generates electricity through photovoltaics, and the electric energy is used for circulating water pumps after processing;

The process of solar heat storage is: after the cooling water of the photovoltaic module is heated, it is pumped into the evaporator through the third circulating water pump, and the circulating water from the heat storage tank in the lower reservoir is heated through the compressor and condenser to carry out inter-seasonal storage. hot;

In the heat supply process, the fourth circulating water pump transports the hot water in the heat storage tank to the heat supply users;

The water energy storage process, the specific implementation process is: the first circulating water pump pumps water from the lower reservoir to the upper reservoir to realize the energy storage process;

In the process of hydropower generation, the upper reservoir is located above the lower reservoir, and the water turbine unit is arranged close to the lower reservoir. Through the action of gravitational potential energy, the water in the upper reservoir converts the gravitational potential energy into kinetic energy and flows through the water turbine unit to generate electricity.

Further, during the solar heat storage process, the clutch is closed, and the water turbine unit drives the generator and simultaneously drives the compressor to drive the solar heat pump system to work.

Further, during the solar heat storage process, the second circulating water pump is used for water circulation between the condenser and the heat storage tank.

Further, the heat storage tank is placed in the lower reservoir, and the water tank adopts thermal insulation measures to reduce heat loss.

Further, the electric energy generated by the hydropower is incorporated into the grid through the booster.

In the second aspect, an embodiment of the present invention provides a cross-season energy storage system, including:

An upper reservoir, a water turbine unit, a generator, a lower reservoir, a compressor, a condenser, an evaporator, a photovoltaic module, a heat storage tank, a circulating water pump, and a photovoltaic photothermal integrated system, the upper reservoir is located above the lower reservoir;

The photovoltaic photothermal integrated system generates electricity through photovoltaics, and the electric energy is used by the circulating water pump after being processed;

After the cooling water of the photovoltaic module is heated, it is pumped into the evaporator by the third circulating water pump, and the circulating water from the heat storage tank in the lower reservoir is heated by the compressor and the condenser, Carry out cross-season heat storage;

The fourth circulating water pump delivers the hot water in the hot water storage tank to the heat supply user;

The first circulating water pump pumps water from the lower reservoir to the upper reservoir to realize the energy storage process;

The water in the upper reservoir converts gravitational potential energy into kinetic energy and flows through the water turbine unit to generate electricity.

Further, the photovoltaic photothermal integrated system also includes an expansion valve and an evaporator.

Further, the second circulating water pump is used for water circulation between the condenser and the heat storage tank.

Further, the clutch is closed when the heat is stored across seasons, and the water turbine unit drives the generator and drives the compressor to work at the same time.

Further, it also includes wind turbines, which are used to generate electricity through wind power, and construct wind and solar new energy systems by combining wind power generation and solar power generation.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a schematic flow chart of a cross-season energy storage method provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of a cross-season energy storage system provided by an embodiment of the present invention.

reference sign

1. Upper reservoir; 2. Turbine; 3. Generator; 4. Lower reservoir; 5. Clutch; 6. Compressor; 7. Condenser; 8. Expansion valve; 9. Evaporator; 10. PV/T photovoltaic module 11. Combiner box; 12. Inverter; 13. Power distribution cabinet; 14. Heat storage tank; 15. First circulating water pump; 16. Second circulating water pump; 17. Third circulating water pump; 18. Fourth Circulating water pump; 19. Wind turbine; 20. Booster; 21. Power grid.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It is noted that the following describes various aspects of the embodiments that are within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is illustrative only. Based on the present disclosure, a person skilled in the art should appreciate that an aspect described herein may be implemented independently of any other aspect and that two or more of these aspects may be combined in various ways. For example, any number of the aspects set forth herein can be used to implement an apparatus and/or practice a method. In addition, such an apparatus may be implemented and/or such a method practiced using other structure and/or functionality than one or more of the aspects set forth herein.

It should also be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the drawings rather than the number, shape and Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

Additionally, in the following description, specific details are provided to facilitate a thorough understanding of examples. However, it will be understood by those skilled in the art that the described aspects may be practiced without these specific details.

FIG. 1 shows a schematic diagram of a method 100 for interseasonal energy storage according to the present invention.

Referring to Figure 1 and Figure 2, a cross-season energy storage method of the present invention includes the following process:

The process of solar power generation, the specific realization process is: the photovoltaic photothermal integrated system generates electricity through photovoltaics, and the electric energy passes through the combiner box 11, the inverter 12 and the controller 13, and then supplies the first circulating water pump 15, the second circulating water pump 16, and the third circulating water pump. Circulating water pump 17 is used.

The solar heat storage process is: after the cooling water of the solar photovoltaic/thermal PV/T photovoltaic module 10 is heated, it is pumped into the evaporator 9 through the third circulating water pump 17, and the water from the lower reservoir 4 is heated through the compressor 6 and the condenser 7. The circulating water in the heat storage tank 14 stores heat across seasons.

Further, during the solar heat storage process, the clutch 5 is closed, and the water turbine unit drives the generator 3 and simultaneously drives the compressor 6 to drive the solar heat pump system to work.

According to some aspects of the embodiments of the present invention, the second circulating water pump 16 is used for water circulation between the condenser 7 and the heat storage tank 14 during the solar heat storage process.

Optionally, the solar power generation and heat storage process may be performed during the daytime during the non-heating season.

During the heat supply process, the fourth circulating water pump 18 delivers the hot water in the heat storage tank 14 to the heat supply users.

Specifically, for example, in some aspects according to the embodiments of the present invention, the hot water storage tank 14 is placed in the lower water reservoir, and the water tank adopts thermal insulation measures to reduce heat loss, and the top of the lower water reservoir 4 is equipped with a thermal insulation cover plate This prevents moisture from evaporating.

The water energy storage process, the specific implementation process is: the first circulating water pump 15 pumps water from the lower reservoir 4 to the upper reservoir 1 to realize the energy storage process;

In the process of hydropower generation, the upper reservoir 1 is built on the basis of natural terrain conditions such as mountains. The water turbine unit 2 is arranged at the bottom of the mountain, close to the lower reservoir 4. Through the action of gravitational potential energy, the water in the upper reservoir converts the gravitational potential energy into kinetic energy flow Generate electricity through the water turbine unit 2; the electric energy is incorporated into the grid 21 through the booster 20.

Referring to the above process, this embodiment couples the solar photovoltaic photothermal integrated system and the pumped storage system, relies on the natural mountain for construction, ensures the reliability of the pumped storage system, and utilizes the artificially built heat storage of the reservoir The heat storage of the body solves the instability and timeliness problems of the solar system itself. At the same time, the solar energy is converted into electrical energy for power supply of water pumps, and then the electrical energy is converted into the gravitational potential energy of the water in the reservoir, thus realizing stable energy storage. And the complementary utilization of a variety of renewable energy, while meeting the power generation requirements, it can provide convenient conditions for urban heating.

Fig. 2 shows a cross-season energy storage system 300 according to the present invention.

As shown in FIG. 2 , the system 300 includes an upper reservoir 1 , a water turbine unit 2 , a generator 3 , a lower reservoir 4 , a heat storage tank 14 , a circulating water pump, and a photovoltaic-solar-thermal integrated system.

The upper reservoir is located above the lower reservoir;

Specifically, for example, in some aspects according to the embodiments of the present invention, the upper reservoir is located at the upper part of the mountain, and the lower reservoir and the water turbine unit are located at the lower part of the mountain;

The water turbine unit is arranged near the lower reservoir, and through the action of gravitational potential energy, the water in the upper reservoir converts the gravitational potential energy into kinetic energy and flows through the water turbine unit and the generator to generate electricity;

The hot water storage tank is used to store the thermal energy of the photovoltaic-photothermal integrated system;

The photovoltaic photothermal integrated system includes a PV/T photovoltaic module 10, and the photovoltaic photothermal integrated system also includes a compressor 6; a condenser 7; an expansion valve 8; an evaporator 9, which is used for solar power generation and heat storage.

Further, the circulating water pump includes a first circulating water pump 15 , a second circulating water pump 16 , a third circulating water pump 17 and a fourth circulating water pump 18 .

The first circulating water pump 15 is used to pump water from the lower reservoir 4 to the upper reservoir 1 to realize the energy storage process;

The second circulating water pump 16 is used for water circulation between the condenser 7 and the heat storage tank 14 .

The third circulating water pump 17 pumps the heated cooling water of the PV/T photovoltaic module 10 into the heat pump system evaporator 9;

The fourth circulating water pump 18 delivers the hot water in the hot water storage tank 14 to the heat supply user to realize the heat supply process.

Optionally, a booster 20 is also included, and the electric energy sent by the generator enters the grid through the booster;

Further, the heat storage tank is located in the lower reservoir; the heat storage tank adopts thermal insulation measures to reduce heat loss, and the top of the lower reservoir 4 is equipped with a thermal insulation cover to prevent water evaporation;

Furthermore, the inter-seasonal energy storage system also includes a clutch 5, the clutch (5) is closed during the solar heat storage process, the water turbine unit drives the generator 3 and the compressor 6 at the same time, and drives the solar heat pump system to work.

Further, the photovoltaic photothermal integrated system also includes a combiner box 11 passing through an inverter 12 and a controller 13, and the photovoltaic power generation passes through the combiner box 11 and passes through the inverter 12 and controller 13 for use by the circulating water pump.

Further, after the cooling water of the PV/T photovoltaic module 10 is heated, it is pumped into the heat pump system evaporator 9 through the third circulating water pump 17, and the heat storage tank 14 from the lower reservoir 4 is heated through the compressor 6 and the condenser 7 Circulating water in the water for cross-season heat storage.

Further, the inter-seasonal energy storage system also includes a wind turbine 19, which is used to generate electricity through wind power. By combining wind power and solar power, a wind and solar new energy system is constructed.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A method for interseasonal energy storage, characterized in that it comprises: The process of solar power generation, the specific implementation process is: the photovoltaic photothermal integrated system generates electricity through photovoltaics, and the electric energy is used for circulating water pumps after processing; The solar heat storage process is: after the cooling water of the photovoltaic module (10) is heated, it is pumped into the evaporator (9) through the third circulating water pump (17), and is heated from the lower water reservoir through the compressor (6) and the condenser (7). The circulating water in the heat storage tank (14) in (4) stores heat across seasons; In the heat supply process, the fourth circulating water pump (18) delivers the hot water in the heat storage tank (14) to the heat supply user; The specific implementation process of the water energy storage process is as follows: the first circulating water pump (15) pumps water from the lower reservoir (4) to the upper reservoir (1) to realize the energy storage process; In the hydropower generation process, the water in the upper reservoir (1) converts gravitational potential energy into kinetic energy and flows through the water turbine unit (2) to generate electricity. 2. The cross-seasonal energy storage method according to claim 1, characterized in that the clutch (5) is closed during the solar heat storage process, and the water turbine unit (2) drives the generator (3) and simultaneously drives the compressor (6) Work. 3. The cross-season energy storage method according to claim 1, characterized in that, during the solar heat storage process, the second circulating water pump (16) is used for the condenser (7) and the heat storage tank (14) The water cycle. 4. The cross-seasonal energy storage method according to claim 3, characterized in that the hot water storage tank (14) is placed in the lower reservoir (4), and the hot water storage tank (14) adopts thermal insulation measures . 5. The interseasonal energy storage method according to claim 1, characterized in that, the electric energy generated by the hydropower is incorporated into the grid (21) through a booster (20). 6. A cross-season energy storage system, characterized in that it comprises: Upper reservoir (1), turbine unit (2), generator (3), lower reservoir (4), compressor (6), condenser (7), evaporator (9), photovoltaic module (10), heat storage A water tank (14), a circulating water pump, and a photovoltaic-photothermal integrated system, the upper reservoir is located above the lower reservoir; The photovoltaic photothermal integrated system generates electricity through photovoltaics, and the electric energy is used by the circulating water pump after being processed; After the cooling water of the photovoltaic module (10) is heated, it is pumped into the evaporator (9) through the third circulating water pump (17), and is heated by the compressor (6) and the condenser (7). The circulating water in the heat storage tank (14) in the lower reservoir (4) is used to store heat across seasons; The fourth circulating water pump (18) delivers the hot water in the hot water storage tank (14) to heat supply users; The first circulating water pump (15) pumps water from the lower reservoir (4) to the upper reservoir (1) to realize the energy storage process; The water in the upper reservoir (1) converts gravitational potential energy into kinetic energy and flows through the water turbine unit (2) to generate electricity. 7. The interseasonal energy storage system according to claim 6, characterized in that, the integrated photovoltaic-solar-thermal system further comprises an expansion valve (8) and an evaporator (9). 8. The inter-seasonal energy storage system according to claim 6, characterized in that, the circulating water pump further comprises a second circulating water pump (16), and the second circulating water pump (16) is used for the condenser (7) and The water circulation of the heat storage tank (14). 9. The inter-seasonal energy storage system according to claim 8, characterized in that the clutch (5) is closed during inter-seasonal heat storage, and the water turbine unit (2) drives the generator (3) and simultaneously drives the compressor (6) to work. 10. The interseasonal energy storage system according to claim 6, characterized in that it also includes a wind turbine (19), which is used to generate electricity through wind power, and build a wind and solar new energy system by combining wind power and solar power.

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