Carnot cell device

Abstract

The utility model discloses a Carnot battery device, and relates to the technical field of energy storage. The Carnot battery device comprises a driving motor, a compressor, a gas cooler, a heat storage tank, a first cold storage tank, an expansion machine, an evaporator and a second cold storage tank, energy storage media are arranged in the heat storage tank and the first cold storage tank, and a heat exchange medium is arranged in the second cold storage tank; the driving motor is in transmission connection with the compressor; the gas cooler comprises a first heat exchange loop and a second heat exchange loop, and the heat storage tank, the first heat exchange loop and the first cold storage tank are sequentially communicated; the evaporator comprises a third heat exchange loop and a fourth heat exchange loop, the compressor, the second heat exchange loop, the expansion machine and the third heat exchange loop are sequentially communicated, and the third heat exchange loop is further communicated with the compressor; and the second cold storage tank is communicated with a fourth heat exchange loop of the evaporator. The Carnot cell device disclosed by the utility model can realize balance and stability of power grid energy supply.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage, and particularly relates to a Carnot battery device. Background Art

[0002] With the rapid development of new energy technologies, the installed capacity and utilization rate of renewable energy represented by wind power and photovoltaic power have increased significantly. The electricity generated by renewable energy has increased rapidly, accelerating the transformation of China's energy structure towards low-carbonization. At the same time, technical defects such as the volatility and intermittency of renewable energy power generation have become more prominent, resulting in objective problems such as difficult power consumption and difficult power transmission. If these power generation technologies are applied to the power grid on a large scale, it will have a significant impact on the stability and safety of the power grid.

[0003] Therefore, how to provide an effective solution to achieve the balance and stability of the power grid energy supply has become an urgent problem to be solved in the existing technology. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a Carnot battery device to solve the above problems existing in the existing technology.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a Carnot battery device, including: a driving motor, a compressor, a gas cooler, a heat storage tank, a first cold storage tank, an expander, an evaporator and a second cold storage tank. Energy storage media are arranged in the heat storage tank and the first cold storage tank, and a heat exchange medium is arranged in the second cold storage tank;

[0007] The driving motor is in transmission connection with the compressor;

[0008] The gas cooler includes a first heat exchange loop and a second heat exchange loop. The heat storage tank, the first heat exchange loop of the gas cooler and the first cold storage tank are connected in sequence;

[0009] The evaporator includes a third heat exchange loop and a fourth heat exchange loop. The compressor, the second heat exchange loop of the gas cooler, the expander and the third heat exchange loop of the evaporator are connected in sequence, and the third heat exchange loop of the evaporator is also connected to the compressor;

[0010] The second cold storage tank is connected to the fourth heat exchange loop of the evaporator.

[0011] Based on the above - disclosed content, the Carnot battery device provided by the present utility model is configured by setting a driving motor, a compressor, a gas cooler, a heat storage tank, a first cold storage tank, an expander, an evaporator, and a second cold storage tank. Energy storage media are provided in the heat storage tank and the first cold storage tank, and a heat exchange medium is provided in the second cold storage tank. The driving motor is in transmission connection with the compressor. The gas cooler includes a first heat exchange circuit and a second heat exchange circuit. The heat storage tank, the first heat exchange circuit of the gas cooler, and the first cold storage tank are connected in sequence. The evaporator includes a third heat exchange circuit and a fourth heat exchange circuit. The compressor, the second heat exchange circuit of the gas cooler, the expander, and the third heat exchange circuit of the evaporator are connected in sequence, and the third heat exchange circuit of the evaporator is also connected to the compressor. The second cold storage tank is connected to the fourth heat exchange circuit of the evaporator. In this way, when it is at the low - electricity - consumption period or there is curtailment of wind and solar power, the surplus electric energy can be used to drive the driving motor, thereby driving the compressor to suck in and compress working media such as tetrafluoroethane or carbon dioxide into high - temperature and high - pressure gaseous working media, converting the electric energy into internal energy. The high - temperature and high - pressure gaseous working media after compression and temperature rise exchange heat with the low - temperature energy storage medium in the first cold storage tank. The high - temperature energy storage medium obtained after heat exchange enters the heat storage tank. At the same time, the working medium enters the evaporator through the expander for isothermal and isobaric evaporation and gasification after being cooled and depressurized, and exchanges heat with the heat exchange medium in the second cold storage tank. The cold quantity is stored in the second cold storage tank in the form of latent heat. The gaseous working medium after evaporation and heat absorption enters the compressor to complete the heat - pump cycle, thereby storing the consumed electric energy in the heat storage tank in the form of heat energy. When it is necessary to release electric energy, the gaseous working medium can be exchanged heat with the high - temperature energy storage medium in the heat storage tank through the gas cooler. The heated gaseous working medium enters the compressor to drive the compressor to do work (the compressor can also act as an expander), thereby driving the driving motor to generate electricity, converting the heat energy into mechanical energy and then into electric energy, thus completing the output of electric energy. At the same time, the gaseous working medium that has completed work in the compressor enters the evaporator to release heat isothermally to form a liquid working medium. The liquid working medium enters the second compressor for adiabatic pressure boost to form a gaseous working medium and enters the gas cooler to absorb heat, thereby completing the energy - release process. In this way, the surplus electric energy can be converted into heat energy for storage during the low - electricity - consumption period or curtailment of wind and solar power, and the stored heat energy can be converted into mechanical energy for power generation during the power - shortage period. Thus, through the storage and release of electric energy, the more efficient utilization of renewable energy is realized, the purpose of peak - shaving and valley - filling in the power system is achieved, and the balance and stability of the power grid energy supply are realized.

[0012] In a possible design, the Carnot battery device further includes a first energy - balancing heat pump and a heat exchange pipe. The heat exchange pipe is disposed in the second cold storage tank. The water inlet of the heat exchange pipe is connected to the water outlet of the first energy - balancing heat pump, and the water outlet of the heat exchange pipe extends outside the second cold storage tank.

[0013] In a possible design, the compressor and the expander are coaxially arranged.

[0014] In a possible design, the energy storage medium is molten salt.

[0015] In a possible design, the energy storage medium is water.

[0016] In a possible design, the heat exchange medium is water.

[0017] In a possible design, the working fluid inhaled by the compressor is tetrafluoroethane.

[0018] In a possible design, the working fluid inhaled by the compressor is carbon dioxide.

[0019] Beneficial effects:

[0020] The Carnot battery device provided by the present utility model can convert excess electric energy into heat energy for storage during low electricity consumption periods or when there is curtailment of wind and solar power, and can convert the stored heat energy into mechanical energy for power generation during periods of power shortage. Thus, through the storage and release of electric energy, more efficient utilization of renewable energy is achieved, the purpose of peak shaving and valley filling in the power system is achieved, and the balance and stability of the power grid energy supply are realized, which is convenient for practical application and popularization. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the Carnot battery device provided by the embodiment of the present application.

[0022] Icon:

[0023] 10 - driving motor; 20 - compressor; 30 - gas cooler; 40 - heat storage tank; 50 - first cold storage tank; 60 - expander; 70 - evaporator; 80 - second cold storage tank; 90 - first energy balance heat pump; 100 - second energy balance heat pump. Detailed Embodiments

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the present utility model in combination with the drawings and the descriptions of the embodiments or the prior art. Obviously, the following descriptions of the structures of the drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. It should be noted here that the descriptions of these embodiments are used to help understand the present utility model, but do not constitute a limitation to the present utility model.

[0025] It should be understood that although the terms first, second, etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, a first unit can be referred to as a second unit, and similarly, a second unit can be referred to as a first unit without departing from the scope of the exemplary embodiments of the present utility model.

[0026] It should be understood that the term "and / or" that may appear in this article is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" that may appear in this article describes another type of association object relationship, indicating that two relationships may exist. For example, A / and B can represent two situations: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0027] like Figure 1 As shown, this embodiment provides a Carnot battery device, which includes: a drive motor 10, a compressor 20, a gas cooler 30, a heat storage tank 40, a first cold storage tank 50, an expander 60, an evaporator 70 and a second cold storage tank 80.

[0028] Among them, the heat storage tank 40 and the first cold storage tank 50 are provided with energy storage medium, and the second cold storage tank 80 is provided with heat exchange medium; the driving motor 10 is connected to the compressor 20 in a transmission manner; the gas cooler 30 includes a first heat exchange circuit and a second heat exchange circuit, and the heat storage tank 40, the first heat exchange circuit of the gas cooler 30 and the first cold storage tank 50 are connected in sequence; the evaporator 70 includes a third heat exchange circuit and a fourth heat exchange circuit, and the compressor 20, the second heat exchange circuit of the gas cooler 30, the expander 60 and the third heat exchange circuit of the evaporator 70 are connected in sequence, and the third heat exchange circuit of the evaporator 70 is also connected to the compressor 20; the second cold storage tank 80 is connected to the fourth heat exchange circuit of the evaporator 70. In the figure, the arrows in the solid line part indicate the flow direction of the gas working medium in the energy storage stage, and the arrows in the dotted line part of the figure indicate the flow direction of the gas working medium in the power supply stage of releasing electric energy.

[0029] The heat storage tank 40 and the first cold storage tank 50 are provided with energy storage medium, and the energy storage medium may be, but is not limited to, molten salt or water. Since molten salt has a series of advantages such as high operating temperature, wide operating temperature range, strong heat transfer capacity, low system pressure, and good economy, it has become the first choice for heat transfer and heat storage medium in solar thermal power stations. Therefore, molten salt can be used as the energy storage medium in the embodiment of the present application.

[0030] A heat exchange medium is disposed in the second cold storage tank 80 . Considering the cost, water may be used as the heat exchange medium in the embodiment of the present application.

[0031] The drive motor 10 can be connected to wind power, photovoltaic and other power generation equipment and connected to the compressor 20. When the power consumption is low or the wind and solar power are abandoned, the excess electric energy of the wind power, photovoltaic and other power generation equipment can be used to drive the drive motor 10, and the drive motor 10 drives the compressor 20 connected to it. At this time, the compressor 20 can absorb the working medium in the environment and compress it into a high-temperature and high-pressure gas working medium, converting the electrical energy into internal energy. Among them, the working medium can be but not limited to tetrafluoroethane or carbon dioxide and other gases. In the embodiment of the present application, carbon dioxide can be used as the working medium.

[0032] The compressed and heated high-temperature and high-pressure gas working medium enters the second heat exchange circuit of the gas cooler 30, and exchanges heat with the low-temperature energy storage medium in the first heat exchange circuit of the first cold storage tank 50 that enters the gas cooler 30. The high-temperature energy storage medium obtained after the heat exchange enters the heat storage tank 40.

[0033] At the same time, the working fluid enters the evaporator 70 for isothermal and isobaric evaporation and gasification after being cooled, expanded and decompressed by the expander 60, and exchanges heat with the heat exchange medium in the second cold storage tank 80, so that the cold energy is stored in the second cold storage tank 80 in the form of latent heat. The gas working fluid after evaporation and heat absorption enters the compressor 20 to complete the heat pump cycle, thereby storing the consumed electrical energy in the heat storage tank in the form of thermal energy.

[0034] In one or more embodiments, the compressor 20 is coaxially arranged with the expander 60. If during the energy storage process, the drive motor 10 can synchronously drive the expander 60 to expand and decompress, there is no need to supply additional power to the expander 60, thereby improving the energy storage efficiency.

[0035] The second cold storage tank 80 is used to provide a cold source. Figure 1 The Carnot battery device also includes a first energy balance heat pump 90 and a heat exchange tube. The heat exchange tube is arranged in the second cold storage tank 80. The water inlet of the heat exchange tube is connected to the water outlet of the first energy balance heat pump 90. The water outlet of the heat exchange tube extends to the outside of the second cold storage tank 80. By setting the first energy balance heat pump 90 and the heat exchange tube, the heat source can be extracted from the outside through the first energy balance heat pump 90 and heat exchanged with the heat exchange medium in the second cold storage tank 80 through the heat exchange tube, thereby consuming the cold. At the same time, the heat exchange medium in the second cold storage tank 80 can be used as a cold source to cool other heat sources.

[0036] When electric energy needs to be released for power supply, the gas working medium can be heat-exchanged with the high-temperature energy storage medium in the heat storage tank 40 through the gas cooler 30. The heated gas working medium enters the compressor 20 to drive the compressor 20 to do work (the compressor 20 can also be used as an expander, and the compression or expansion and pressure reduction of the compressor 60 can be achieved by controlling the forward and reverse rotation), thereby driving the drive motor 10 to generate electricity, converting thermal energy into mechanical energy and then converting mechanical energy into electric energy, so as to complete the output of electric energy. At the same time, the gas working medium that has done work in the compressor 20 enters the evaporator 70 to release heat isothermally to form a liquid working medium. The liquid working medium enters the second compressor to adiabatically boost the pressure to form a gaseous working medium and enters the gas cooler 30 to absorb heat, thus completing the entire energy release process. During the process of releasing electric energy for power supply, pressure can be provided by the expander 60 to drive the movement of the working medium.

[0037] In one or more embodiments, a second energy balance heat pump 100 can also be provided between the second heat exchange circuit of the gas cooler 30 and the third heat exchange circuit of the evaporator 70, which is used to drive the circulation of the gas working medium when releasing electric energy for power supply.

[0038] In summary, for the Carnot battery device provided by the present utility model, by setting a driving motor 10, a compressor 20, a gas cooler 30, a heat storage tank 40, a first cold storage tank 50, an expander 60, an evaporator 70 and a second cold storage tank 80, energy storage media are provided in the heat storage tank 40 and the first cold storage tank 50, and a heat exchange medium is provided in the second cold storage tank 80; the driving motor 10 is in transmission connection with the compressor 20; the gas cooler 30 includes a first heat exchange circuit and a second heat exchange circuit, and the heat storage tank 40, the first heat exchange circuit of the gas cooler 30 and the first cold storage tank 50 are connected in sequence; the evaporator 70 includes a third heat exchange circuit and a fourth heat exchange circuit, and the compressor 20, the second heat exchange circuit of the gas cooler 30, the expander 60 and the third heat exchange circuit of the evaporator 70 are connected in sequence, and the third heat exchange circuit of the evaporator 70 is also connected to the compressor 20; the second cold storage tank 80 is connected to the fourth heat exchange circuit of the evaporator 70. In this way, when it is at the low electricity consumption period or there is curtailment of wind and solar power, the redundant electric energy can be used to drive the driving motor 10, thereby driving the compressor 20 to suck in and compress working media such as tetrafluoroethane or carbon dioxide into high-temperature and high-pressure gaseous working media, converting the electric energy into internal energy. The high-temperature and high-pressure gaseous working media after compression and temperature rise exchange heat with the low-temperature energy storage medium in the first cold storage tank 50. The high-temperature energy storage medium obtained after heat exchange enters the heat storage tank 40. At the same time, the working medium enters the evaporator 70 after being decompressed and cooled by the expander 60 for isothermal and isobaric evaporation and gasification, and exchanges heat with the heat exchange medium in the second cold storage tank 80. The cold quantity is stored in the second cold storage tank 80 in the form of latent heat. The gaseous working medium after evaporation and heat absorption enters the compressor 20 to complete the heat pump cycle, thereby storing the consumed electric energy in the heat storage tank in the form of heat energy. When it is necessary to release electric energy, the gaseous working medium can be exchanged heat with the high-temperature energy storage medium in the heat storage tank 40 through the gas cooler 30. The heated gaseous working medium enters the compressor 20 to drive the compressor 20 to do work, thereby driving the driving motor 10 to generate electricity, converting the heat energy into mechanical energy and the mechanical energy into electric energy, so as to complete the output of electric energy. At the same time, the gaseous working medium after the compressor 20 finishes doing work enters the evaporator 70 to release heat isothermally to form a liquid working medium. The liquid working medium enters the second compressor for adiabatic pressure boost to form a gaseous working medium and enters the gas cooler 30 to absorb heat, thereby completing the entire energy release process. In this way, redundant electric energy can be converted into heat energy for storage during the low electricity consumption period or curtailment of wind and solar power, and the stored heat energy can be converted into mechanical energy for power generation during the power shortage period. Thus, through the storage and release of electric energy, the more efficient utilization of renewable energy is realized, and the purpose of peak shaving and valley filling of the power system is achieved, realizing the balance and stability of the power grid energy supply. At the same time, the Carnot battery device provided by the present utility model uses molten salt to store heat, has a small floor area and is not restricted by geographical location. In addition, by adopting the heat storage method, the efficiency of the unit is independent of the storage capacity, and the system conversion efficiency can always be kept stable, and the electric energy conversion efficiency is high.Finally, it can achieve combined cooling, heating and power supply, easily realize multi-energy complementarity, and has natural advantages when combined with the flexibility transformation of photovoltaic, solar thermal and thermal power. Moreover, the larger the power scale, the lower the unit cost. Only an increase in the molten salt storage needs to be matched with the increase in the energy storage capacity, which can be widely used for large-scale energy storage.

[0039] It should be understood that specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, those of ordinary skill in the art should understand that the exemplary embodiments can be implemented without these specific details. For example, a system can be shown in a block diagram to avoid obscuring the example with unnecessary details. In other instances, well-known processes, structures, and techniques can be shown without unnecessary details to avoid obscuring the exemplary embodiments.

[0040] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A Carnot battery device, characterized in that: include: A driving motor, a compressor, a gas cooler, a heat storage tank, a first cold storage tank, an expander, an evaporator, and a second cold storage tank, wherein the heat storage tank and the first cold storage tank are provided with energy storage medium, and the second cold storage tank is provided with heat exchange medium; The driving motor is drivingly connected to the compressor; The gas cooler comprises a first heat exchange circuit and a second heat exchange circuit, and the heat storage tank, the first heat exchange circuit of the gas cooler and the first cold storage tank are connected in sequence; The evaporator comprises a third heat exchange circuit and a fourth heat exchange circuit, the compressor, the second heat exchange circuit of the gas cooler, the expander and the third heat exchange circuit of the evaporator are connected in sequence, and the third heat exchange circuit of the evaporator is also connected to the compressor; The second cold storage tank is in communication with a fourth heat exchange circuit of the evaporator.

2. The Carnot battery device according to claim 1, characterized in that: It also includes a first energy balance heat pump and a heat exchange pipe, wherein the heat exchange pipe is arranged in the second cold storage tank, the water inlet of the heat exchange pipe is connected to the water outlet of the first energy balance heat pump, and the water outlet of the heat exchange pipe extends to the outside of the second cold storage tank.

3. The Carnot battery device according to claim 1, characterized in that: The compressor is coaxially arranged with the expander.

4. The Carnot battery device according to claim 1, characterized in that: The energy storage medium is molten salt.

5. The Carnot battery device according to claim 1, characterized in that: The energy storage medium is water.

6. The Carnot battery device according to claim 1, characterized in that: The heat exchange medium is water.

7. The Carnot battery device according to claim 1, characterized in that: The working fluid sucked by the compressor is tetrafluoroethane.

8. The Carnot battery device according to claim 1, characterized in that: The working fluid sucked by the compressor is carbon dioxide.

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