CN118009573A - Solar energy coupling energy storage system and method - Google Patents

Abstract

The application provides a solar energy coupling energy storage system and a method. The system comprises: the solar heat collection module absorbs solar energy and transfers heat to the heat transfer medium to output heat energy; a first media store that outputs, receives and stores phase change media; the heat storage device is used for receiving and storing the heat transfer medium output by the solar heat collection module and outputting heat energy in at least two ways, wherein one way of heat energy is used for heating the phase change medium so as to heat the phase change medium to improve the working capacity of the phase change medium; the absorption refrigerator works through another path of heat and outputs cold energy, and the cold energy is used for cooling the phase-change medium so that the phase-change medium is condensed and can be stored in a liquid state. The system directly provides energy for condensation and evaporation of the phase-change medium through solar energy, saves a large amount of energy consumption, can heat the phase-change medium by solar energy heat, improves the energy release and energy consumption ratio of the energy storage system, improves the utility of the energy storage system, reduces the storage pressure of the phase-change medium, saves cost and has high economical efficiency.

Description

Solar energy coupling energy storage system and method

Technical Field

The application relates to the technical field of energy storage, in particular to a solar energy coupling energy storage system and a method.

Background

The energy storage system can realize large-capacity energy storage, and can release the energy stably for utilization when the energy is needed, so that various services such as peak shaving, frequency modulation, standby, black start, demand response support and the like can be provided for power grid operation. The system for storing energy through the medium, such as a carbon dioxide energy storage system, has the advantages of safety, environmental protection, reliability, long time and the like, can be used for matching with large-scale solar power generation, and can also provide cold energy. However, in the energy storage system, energy is required for the phase change of the medium, for example, cold energy is required for condensing carbon dioxide when the carbon dioxide stores energy, and heat is required for the evaporation process when energy is released outwards, for example, carbon dioxide is used for generating electricity, and low-temperature liquid carbon dioxide is also required to be evaporated. That is, the energy storage system also needs to consume a certain amount of energy, such as electric energy, to maintain operation, and the higher the ratio of energy release and energy consumption, the higher the utility and the lower the cost.

Disclosure of Invention

In view of this, the present application is directed to a solar energy coupling energy storage system and method, which directly provides energy for condensation and evaporation of a phase change medium through solar energy, saves energy and consumes a lot of electric energy, and can heat the phase change medium by using heat of solar energy, so as to improve the energy release and energy consumption ratio of the energy storage system, improve the utility of the energy storage system, save cost and have high economical efficiency.

The application provides a solar energy coupling energy storage system, comprising:

the solar heat collection module absorbs solar energy and transfers heat to a heat transfer medium, and the heat energy is output through the heat transfer medium;

The first medium reservoir is used for outputting, receiving and storing the phase change medium and realizing energy storage or energy release through the state change of the phase change medium; the phase change medium may include or may be carbon dioxide;

the heat storage device is used for receiving and storing the heat transfer medium output by the solar heat collection module and outputting heat energy in at least two ways, wherein one way of heat energy is used for heating the phase change medium so as to heat the phase change medium to improve the function doing capability;

The absorption refrigerator works through the other path of heat output by the heat storage device and outputs cold energy, and the cold energy is used for cooling the phase-change medium so that the phase-change medium is condensed and can be stored in a liquid state.

In one possible embodiment, the method further comprises:

A compressor for compressing the gaseous phase change medium with a first pressure value output by the first medium reservoir to increase the pressure of the phase change medium;

The cold accumulation device is used for absorbing cold energy output by the absorption refrigerator and cooling the gaseous phase change medium output by the compressor so as to output liquid phase change medium;

the second medium reservoir is used for receiving, storing and outputting the liquid phase change medium output by the cold accumulation device;

the booster pump is connected with the liquid outlet of the second medium reservoir so as to further increase the pressure of the phase-change medium;

A heating device for heating the phase change medium output by the second medium reservoir by the heat of the heat transfer medium and outputting a gaseous phase change medium having a second pressure value;

a first expander that outputs energy by expanding the gaseous phase-change medium having the second pressure value;

and the precooling device is used for cooling the gaseous phase-change medium output by the first expander and conveying the phase-change medium subjected to pressure release and temperature reduction back to the first medium reservoir.

In one possible embodiment, the method further comprises:

The heat recoverer is arranged between the compressor and the cold accumulation device, absorbs heat of the gaseous phase-change medium output by the compressor through the heat transfer medium after temperature reduction, and conveys the heat transfer medium after heat absorption to the solar heat collection module.

In one possible embodiment, the heat storage device includes:

A high-temperature tank for receiving and storing the heat transfer medium output by the solar heat collection module and respectively conveying the heat transfer medium to the absorption refrigerator and the heating device to output heat energy;

A low temperature tank for receiving and storing the heat transfer medium outputted from the heating device and for transferring the heat transfer medium to the heat recoverer so that the heat recoverer absorbs heat of the gaseous phase change medium outputted from the compressor through the heat transfer medium;

And the medium-temperature tank is used for receiving the heat transfer medium output by the absorption refrigerator and the heat recoverer and sending the heat transfer medium back to the solar heat collection module.

In one possible embodiment, the pre-cooling device comprises a first pre-cooler and a second pre-cooler;

the first flow passage of the first precooler is connected with the liquid outlet of the booster pump, and the second flow passage is connected with the gas outlet of the first expander, so that the liquid phase-change medium output by the second medium reservoir absorbs the heat of the gaseous phase-change medium output by the first expander;

The second precooler is used for cooling the gaseous phase change medium output by the first precooler through the cold energy output by the cold accumulation device.

In one possible embodiment, the device further comprises a heat storage device arranged between the heating device and the second medium reservoir, wherein the heat storage device is provided with a waste heat absorption channel and a waste heat evaporation channel;

the waste heat absorption channel is used for enabling the second medium output by the absorption refrigerator to flow through and absorb heat of the second medium, and the waste heat evaporation channel is used for enabling the liquid phase change medium output by the second medium reservoir or the first flow channel of the first precooler to flow through so as to evaporate the phase change medium through the waste heat output by the absorption refrigerator.

In one possible embodiment, the heating device includes a first heater and a second heater connected in sequence along a flow direction of the phase change medium, and the heat transfer medium output from the high temperature tank flows through the second heater and the first heater in sequence and then flows back to the low temperature tank.

In one possible embodiment, a second expander is also included and is disposed between the pre-cooling device and the first media store.

The application also provides a solar energy coupling and storing method which is suitable for the solar energy coupling and storing system and comprises the following steps:

Heating a heat transfer medium by a solar heat collection module to absorb heat energy;

the heat energy is transmitted to the absorption refrigerator through a first path, so that the absorption refrigerator is driven to work through the heat energy to generate cold energy and waste heat;

Providing thermal energy to the heating device through a second path;

When storing energy, the first medium reservoir is opened to output a gaseous phase-change medium, the gaseous phase-change medium is pressurized, the pressurized gaseous phase-change medium is cooled by using cold energy provided by the absorption refrigerator, and the condensed liquid phase-change medium is stored in the second medium reservoir, so that the phase-change medium is pressurized and absorbs the cold energy to store energy;

when releasing energy, the second medium reservoir is opened to output liquid phase-change medium, the pressure is increased by the booster pump, the heating device is used for heating, the heated gaseous phase-change medium releases energy by outputting energy by the expander, and the gaseous phase-change medium flows back to the first medium reservoir after reducing the pressure and the temperature.

In one possible implementation, the method further comprises the following steps:

when energy is released, the liquid phase-change medium output by the second medium reservoir is boosted by the booster pump, then the cold energy is released by the first precooler to raise the temperature, then the residual heat output by the absorption refrigerator is absorbed by the heat storage device to evaporate, and the gaseous phase-change medium is heated by the heating device;

The heated gaseous phase-change medium firstly outputs energy through a first expander, then is cooled through the first precooler and the second precooler, is cooled and depressurized through the second expander, and finally flows back to the first medium reservoir.

According to the solar energy coupling energy storage system and the method, high-grade solar heat is converted into cold energy and low-grade heat through the absorption refrigerator, the former solves the condensation requirement of a gaseous phase-change medium, the latter solves the evaporation requirement of a liquid phase-change medium, so that energy is provided for condensation and evaporation of the phase-change medium directly through solar energy, and a large amount of electric energy consumption is saved; meanwhile, the phase-change medium can be stored in a medium storage in a low-temperature low-pressure liquid state, and then is evaporated, boosted and cooled when in use, so that the phase-change medium can release compression heat and absorb cold energy to store energy in a high-pressure liquid state, the storage pressure of the phase-change medium is always at a relatively low level, the safety is improved, the high-grade solar heat is also used for heating the phase-change medium to heat the phase-change medium, the expansion power generation capacity of the phase-change medium is improved, the energy release and energy consumption ratio of an energy storage system is improved, the utility of the energy storage system is improved, the economy is high, and the phase-change medium is particularly suitable for the application of matched energy storage of a solar power generation large base.

Drawings

Fig. 1 is a schematic diagram of a solar energy coupling and storing system according to an embodiment of the application.

In fig. 1:

1. A solar heat collection module; 2. an absorption refrigerator; 21. a heat flow channel; 22. a cooling water passage; 23. a refrigerant passage; 3. a low temperature tank; 4. a medium temperature tank; 5. a high temperature tank; 6. a cold storage device; 61. a first cold aisle; 62. a second cold aisle; 63. a third cold aisle; 7. a heat storage device; 71. a waste heat absorption channel; 72. a waste heat evaporation channel; 73. a waste heat discharging passage; 74. a cooling tower; 8. a first media store; 9. a second media store; 10. a compressor; 11. a heat recovery device; 12. a booster pump; 13. a first heater; 14. a second heater; 15. a first expander; 16. a second expander; 17. a first precooler; 18. and a second precooler.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Referring to fig. 1, an embodiment of the present application provides a solar energy coupling energy storage system, which includes a solar energy collecting module 1, a first medium reservoir 8, a heat storage device, and an absorption refrigerator 2. The first medium reservoir 8 is an adiabatic pressure vessel for outputting, receiving and storing the phase change medium, and for storing or releasing energy by a change of state of the phase change medium. The phase change medium may include or may be carbon dioxide. The carbon dioxide has a triple point temperature of about-56.6 ℃ and a triple point pressure of about 0.52MPa, so that the temperature range of the first medium reservoir 8 can be-60 ℃ to-50 ℃ and the pressure range can be 0.50MPa to 0.55MPa. In the original state, or storage state, a phase change medium such as carbon dioxide is stored in the first medium reservoir 8 in a low temperature liquid state. After the first medium reservoir 8 is opened, a part of liquid carbon dioxide is evaporated, gaseous carbon dioxide can be outwards released, meanwhile, a part of residual liquid carbon dioxide is changed into solid, the gaseous carbon dioxide can be compressed to increase the pressure and then absorb cold energy to be condensed again, the gaseous carbon dioxide is stored or transferred in a high-pressure liquid state, then the high-pressure liquid carbon dioxide can be gasified by absorbing heat when releasing energy, the high-pressure liquid carbon dioxide can be expanded to outwards release energy, for example, the high-pressure liquid carbon dioxide is used for generating electricity, and the low-pressure liquid carbon dioxide after expansion work returns to the first medium reservoir 8 to be contacted with the solid carbon dioxide therein for heat exchange and then is jointly liquefied. The system provided by the application provides energy for the phase change of the phase change medium through solar heat energy, so that the electric energy is saved, and the energy efficiency of the system is improved.

In the present application, the solar heat collecting module 1 absorbs solar energy and transfers heat to a heat transfer medium, and the heat transfer medium absorbing the heat flows into other devices to transfer heat energy to the outside. The heat storage device is used for receiving and storing the heat transfer medium which is output by the solar heat collection module 1 and has absorbed solar heat to collect and store heat energy, and simultaneously, when the heat energy is needed to be used, the heat transfer medium is output outwards to output the heat energy. In the application, the heat storage device is used for conveying heat energy outwards in two ways at least through a first path and a second path. The first path transmits heat energy to the absorption refrigerator 2, and the absorption refrigerator 2 is started by the heat energy, that is, solar heat energy is used as driving energy to perform refrigeration, and cold energy and waste heat (the waste heat is low-grade heat) are output.

The cold energy output by the absorption refrigerator 2 is used for cooling the phase-change medium, and the compressed and boosted gaseous phase-change medium can be condensed into a liquid phase-change medium, so that the phase-change medium absorbs the cold energy to store energy, and the phase-change medium is stored in the liquid state. When the phase-change medium releases energy, the heat energy output by the heat storage device through the second path is used for heating the phase-change medium, so that the temperature of the phase-change medium is increased, a high-pressure high-temperature phase-change medium is formed, and then the phase-change medium can expand to release pressure and heat to be used for power generation and the like. The high-grade solar heat is converted into cold energy and low-grade heat through the absorption refrigerator 2, the former solves the condensation requirement of the phase-change medium, and the latter solves the evaporation requirement of the phase-change medium, and the condensation and evaporation of the phase-change medium are directly powered by solar energy. The whole process directly absorbs solar heat energy and is used for utilization, a complex energy source/energy conversion process is not needed, a large amount of electric energy consumption is saved, and the directly used electric power consumption is low.

Meanwhile, compared with the use of electric energy to provide energy for the phase-change medium, the solar energy has the advantages of sufficient energy and high efficiency and can provide a large amount of cold energy. The phase change medium is stored in a medium storage such as the first medium storage 8 in a low-temperature and low-pressure state, when the phase change medium needs to be used, the phase change medium is boosted and then condensed, so that the phase change medium can fully release compression heat and absorb cold energy to store energy in a liquid state, the storage pressure of the phase change medium can be reduced, the storage safety and the storage simplicity are improved, the requirement on the storage is reduced, the cost is saved, the application of a system is facilitated, the high-grade solar heat is also used for heating the phase change medium, the temperature of the phase change medium is increased, the expansion power generation capacity of the phase change medium is improved, the energy release and energy consumption ratio of an energy storage system are improved, the utility of the energy storage system is improved, and the phase change medium is high in economical efficiency and particularly suitable for the application of matched energy storage of a solar power generation large base.

Specifically, as shown in fig. 1, the solar energy coupling energy storage system further comprises a compressor 10, a cold storage device 6, a second medium reservoir 9, an absorption refrigerator 2, a heating device, a first expander 15 and a precooling device.

The phase change medium is stored in the first medium reservoir 8 in a low-pressure liquid state, so that the storage pressure can be reduced, the safety is improved, the storage safety and the storage simplicity are improved, the requirement on the reservoir is reduced, the cost is saved, and the system is convenient to apply. When energy storage and release are needed, the first medium reservoir 8 is opened, a part of the liquid phase-change medium evaporates, and the rest part of the liquid phase-change medium becomes solid. The output gaseous phase-change medium has low pressure and can be recorded as having a first pressure value (the pressure value is within a pressure range and is not limited to a specific value), the inlet of the compressor 10 is connected with the air outlet of the first medium reservoir 8, the low-pressure gaseous phase-change medium output by the first medium reservoir 8 is compressed, the pressure of the phase-change medium is increased, and the phase-change medium is changed into a high-pressure gaseous phase-change medium.

The cold storage device 6 absorbs and stores cold energy output from the absorption refrigerator 2, and uses the cold energy to cool the gaseous phase change medium output from the compressor 10, thereby condensing the high-pressure phase change medium into a high-pressure liquid phase change medium.

As shown in fig. 1, the absorption refrigerator 2 has a heat flow passage 21, a cooling water passage 22, and a refrigerant passage 23, the heat flow passage 21 is provided for a heat transfer medium to flow therethrough, a second medium such as cooling water is circulated in the cooling water passage 22, and a first medium such as a refrigerant is circulated in the refrigerant passage 23. The heat of the heat transfer medium drives the absorption refrigerator 2 to work and refrigerate, the first medium such as a refrigerant absorbs the cold energy and then flows outwards to convey the cold energy, and the second medium such as cooling water absorbs the waste heat and then conveys the waste heat outwards.

The cold storage device 6 has a first cold channel 61 and a third cold channel 63, the first cold channel 61 being connected to the refrigerant channel 23, the refrigerant circulating in the absorption refrigerator 2 and the cold storage device 6 to supply cold energy to the cold storage device 6. And the third cooling channel 63 is used for the high-pressure gaseous phase-change medium output by the compressor 10 to flow through, and provides cooling energy for the phase-change medium, so that the high-pressure gaseous phase-change medium is condensed into a high-pressure liquid phase-change medium.

The second medium reservoir 9 is used for receiving and storing the liquid phase change medium output by the cold accumulation device; the second medium reservoir 9 is an adiabatic pressure vessel, taking as an example a phase change medium carbon dioxide, with a temperature preferably in the interval 0-10 ℃ and a pressure of about 3.5-4.5 MPa. The phase change medium absorbs energy and then temporarily stores or transits through the second medium reservoir 9 to finish energy storage. When the phase change medium is required to release energy, the second medium reservoir 9 outputs a high pressure liquid phase change medium. The system can be further provided with a booster pump 12, and the booster pump 12 can be connected to the liquid outlet of the second medium reservoir 9 to further increase the pressure of the phase-change medium, for example, the pressure value of carbon dioxide can be increased from 3.5-4.5 MPa to about 7 MPa.

The heating device has a passage through which the heat transfer medium flows and a passage through which the phase change medium flows, so that the high-pressure liquid phase change medium is heated by the heat of the heat transfer medium to gasify the high-pressure liquid phase change medium into the high-pressure gaseous phase change medium, and may be referred to as a gaseous phase change medium having a second pressure value (the pressure value is not limited to a specific value within a pressure range), for example, gaseous carbon dioxide of about 7 MPa.

After the first expander 15 is connected to the heating device, the inlet is connected to a channel of the phase change medium of the heating device, receives and expands the high-pressure gaseous phase change medium, and outputs energy, such as power generation, by expanding the high-pressure gaseous phase change medium having the second pressure value.

The precooling apparatus cools the gaseous phase-change medium output from the first expander 15, and changes the gaseous phase-change medium into a low-pressure phase-change medium after the pressure is released by cooling. The gaseous phase-change medium is depressurized and cooled to finish energy release, flows back to the first medium reservoir 8, is contacted with the solid phase-change medium reserved in the first medium reservoir 8 for heat exchange and is liquefied together, and finally, the phase-change medium is stored in the first medium reservoir 8 in a low-temperature and low-pressure liquid state for later use.

Through the above process, the phase change medium is stored in the first medium reservoir 8 in a low-temperature and low-pressure liquid state, so that the safety is high, when the phase change medium needs to be used, the phase change medium absorbs the cold energy converted from the solar heat energy after boosting to liquefy and store energy, and the phase change medium after energy storage is temporarily stored or transferred through the second medium reservoir 9. When releasing energy, the solar heat energy is gasified and heated to become a high-pressure high-temperature gaseous phase-change medium, so that the energy can be released by expansion and doing work, and the energy can be used for power generation and the like. The phase change medium subjected to temperature reduction and pressure reduction flows back to the first medium reservoir 8 for storage, so that the safety is high, long-term storage is easy to realize, and the economical efficiency and usability of the system are improved. In the whole process, solar energy is directly utilized, the solar energy is not required to be processed into electric energy, the steps are simple and convenient, the system is simple, and the cost is low. The high-grade solar heat can be used for heating the phase-change medium, so that the expansion power generation capacity of the phase-change medium is improved, the loss in the energy storage process is compensated, the energy release and energy consumption ratio of the energy storage system is improved, the ratio of the generated energy to the charged amount can reach more than 1, the utility of the energy storage system is improved, and the cost is saved. The solar energy coupling energy storage system provided by the application has excellent technical economy, and is especially suitable for the application of matched energy storage of a solar power generation large base.

Further, to further save energy consumption, in some embodiments, the solar coupled energy storage system further comprises a heat recoverer 11. The heat recoverer 11 is disposed between the compressor 10 and the cold accumulation device 6, absorbs heat of the gaseous phase change medium output from the compressor 10 through the cooled heat transfer medium, and transfers the heat transfer medium to the solar heat collecting module 1 after the heat transfer medium absorbs heat. Therefore, the device can cool the boosted gaseous phase-change medium, absorb compression heat, and heat the cooled heat transfer medium by using the compression heat, so that the compression heat is recycled, and the energy consumption can be saved.

Specifically, the heat storage device includes a high temperature tank 5, a medium temperature tank 4, and a low temperature tank 3, and the high temperature tank 5 receives and stores the heat transfer medium output from the solar heat collecting module 1 and transfers the heat transfer medium to the absorption refrigerator 2 and the heating device, respectively, to output heat energy. The low temperature tank 3 receives and stores the cooled heat transfer medium output from the heating device and can supply the heat transfer medium to the heat recoverer 11 so that the heat recoverer 11 absorbs heat of the gaseous phase change medium output from the compressor 10 through the heat transfer medium to recover the heat. The intermediate temperature tank 4 receives the heat transfer medium output from the absorption refrigerator 2 and the heat recoverer 11, and sends the heat transfer medium back to the solar heat collection module 1. In this way, the heat transfer medium is divided into two paths of circulation flows, as shown in fig. 1, and one path of heat transfer medium circulates according to the paths of the solar heat collection module 1, the high temperature tank 5, the heat flow channel 21 of the absorption refrigerator 2, the medium temperature tank 4 and the solar heat collection module 1. The other path of heat transfer medium circulates according to the solar heat collection module 1, the high temperature tank 5, the heating device, the low temperature tank 3, the heat recoverer 11, the medium temperature tank 4, and the solar heat collection module 1.

In some embodiments, the pre-cooling apparatus includes a first pre-cooler 17 and a second pre-cooler 18. The first precooler 17 has a first flow passage and a second flow passage that exchange heat. The first runner of the first precooler 17 is connected with the liquid outlet of the booster pump 12, and the second runner is connected with the gas outlet of the first expander 15, so that the liquid phase-change medium output by the booster pump 12 firstly absorbs the heat of the gaseous phase-change medium output by the first expander 15, the temperature of the gaseous phase-change medium after pressure release can be reduced, and energy can be provided for gasification of the liquid phase-change medium before energy release, so that energy interaction can be realized, the energy can be recovered and utilized maximally, and the whole energy consumption of the system is saved.

The second precooler 18 is used for cooling the gaseous phase-change medium output from the first precooler 17 by the cold energy output from the cold storage device 6. The cold storage device 6 includes a first cold channel 61 and a third cold channel 63, and further includes a second cold channel 62 through which a cooling medium flows. The second precooler 18 has a third flow passage and a fourth flow passage that exchange heat. The third flow passage of the second precooler 18 is connected with the second flow passage of the first precooler 17 for the gaseous phase-change medium output by the first expander 15 to flow through, the outlet of the fourth flow passage is connected with the inlet of the second cold passage 62, and the inlet is connected with the outlet of the second cold passage 62 for the cold transfer medium output by the second cold passage 62 to pass through. The cooling medium absorbs cold energy from the refrigerant in the first cold channel 61 in the cold accumulation device 6, then flows into the second precooler 18, cools the gaseous phase change medium after energy release, and then flows back to the cold accumulation device 6 for continuous cold energy absorption, and the cycle is performed. The phase change medium after energy release is cooled by cold energy converted from solar heat energy, and no electric energy is needed.

In some embodiments, the solar energy coupling energy storage system further comprises a temperature storage device 7 arranged between the heating device and the second medium reservoir 9, and the temperature storage device 7 heats the high-pressure liquid phase-change medium before energy release through the residual heat output by the absorption refrigerator 2.

The heat storage device 7 has a waste heat absorbing passage 71 and a waste heat evaporating passage 72, the waste heat absorbing passage 71 is connected to the cooling water passage 22 of the absorption refrigerator 2, and a second medium such as cooling water circulates between the absorption refrigerator 2 and the heat storage device 7 to supply the waste heat, i.e., low-grade heat, outputted from the absorption refrigerator 2 to the heat storage device 7. The waste heat evaporation channel 72 is used for flowing the liquid phase change medium output by the second medium reservoir 9 or the first flow channel of the first precooler 17. When the first precooler 17 is provided, the waste heat evaporation channel 72 is connected to the liquid outlet of the first flow channel of the first precooler 17, so that the high-pressure liquid medium flows through before energy release. The high-pressure liquid phase-change medium flowing out of the second medium reservoir 9 is primarily heated through the first precooler 17, then is beneficial to the secondary heating of the waste heat output by the absorption refrigerator 2 through the heat storage device 7 to evaporate, and then flows into the heating device to heat again, so that energy is fully utilized, and the whole energy consumption of the system is saved.

The heat storage device 7 further comprises a waste heat discharging channel 73 and a cooling tower 74, wherein the waste heat discharging channel 73 and the waste heat absorbing channel 71 are arranged side by side, absorb the surplus heat of the low-grade heat output by the absorption refrigerator 2, and send the surplus heat into the cooling tower 74 for emission.

The heating device includes a first heater 13 and a second heater 14 connected in sequence along the flow direction of the phase change medium, and the heat transfer medium outputted from the high temperature tank 5 flows back to the low temperature tank 3 after passing through the second heater 14 and the first heater 13 in sequence. The high-temperature heat transfer medium flows through the second heater 14 and then flows through the first heater 13, and the temperature in the second heater 14 is higher than that of the first heater 13, so that the phase change medium flows through the first heater 13 and then flows through the second heater 14, heat energy is reasonably utilized, and energy waste is avoided.

In some embodiments, the solar coupled energy storage system further comprises a second expander 16 disposed between the pre-cooling device and the first media store 8. The second expander 16 continuously reduces the temperature and the pressure of the gaseous phase-change medium to release energy, then the phase-change medium is conveyed back to the first medium reservoir 8 to fully release energy, the energy release and energy consumption ratio is improved, the high-pressure and low-pressure ratio of the phase-change medium in the whole system is improved, and the storage safety is also improved.

The embodiment of the application also provides a solar energy coupling and storing method, which comprises the following steps:

heating the heat transfer medium by the solar heat collecting module 1 to absorb heat energy;

The heat energy is transmitted to the absorption refrigerator 2 through a first path, so that the absorption refrigerator 2 is driven to work through the heat energy to generate cold energy and waste heat;

Providing thermal energy to the heating device through a second path;

when storing energy, the first medium reservoir 8 is opened to output a gaseous phase-change medium, the gaseous phase-change medium is pressurized, the pressurized gaseous phase-change medium is cooled by cold energy provided by the absorption refrigerator 2, and the condensed liquid phase-change medium is stored in the second medium reservoir 9, so that the pressure of the phase-change medium is increased, the cold energy is absorbed, and the energy is stored;

When releasing energy, the second medium reservoir 9 is opened to output liquid phase-change medium, the pressure is increased by the booster pump 12 and the liquid phase-change medium is heated by the heating device, the heated gaseous phase-change medium releases energy by outputting energy by the expander, and the gaseous phase-change medium flows back to the first medium reservoir 8 after reducing the pressure and the temperature.

The solar energy coupling energy storage method converts high-grade solar heat into cold energy and low-grade heat energy through the absorption refrigerator 2, the cold energy meets the requirement of condensing a high-pressure gaseous phase-change medium, the low-grade heat energy meets the evaporation requirement of a high-pressure liquid phase-change medium, and therefore energy is provided for condensing and evaporating the phase-change medium directly through solar energy, and a large amount of electric energy consumption is saved; meanwhile, the phase-change medium can be stored in a medium storage in a low-temperature low-pressure liquid state, and the phase-change medium is subjected to evaporation and pressure boosting and cooling when in use, so that the phase-change medium can release compression heat and absorb cold energy to store energy in a high-pressure liquid state, the storage pressure of the phase-change medium is always at a relatively low level, the safety is improved, the high-grade solar heat is also used for heating the phase-change medium to heat the phase-change medium, the expansion power generation capacity of the phase-change medium is improved, the energy release and energy consumption ratio of an energy storage system is improved, the utility of the energy storage system is improved, the economy is high, and the phase-change medium is particularly suitable for the application of matched energy storage of a solar power generation large base.

In order to further save energy consumption, the solar energy coupling energy storage method further comprises the following steps:

When energy is released, the liquid phase-change medium output by the second medium reservoir 9 is boosted by the booster pump 12, then the cold energy is released by the first precooler 17 to raise the temperature, then the residual heat output by the absorption refrigerator 2 is absorbed by the heat storage device 7 to evaporate, and the gaseous phase-change medium is heated by the heating device to continuously raise the temperature;

the heated gaseous phase-change medium firstly outputs energy through the first expander 15, then is cooled through the first precooler 17 and the second precooler 18, then is cooled and depressurized through the second expander 16, and finally the gaseous phase-change medium flows back into the first medium reservoir 8.

The high-pressure liquid phase-change medium flowing out of the booster pump 12 firstly passes through the first precooler 17 to release cold energy, the heat of the gaseous phase-change medium which has previously released energy is utilized to initially raise the temperature, the temperature of the gaseous phase-change medium after energy release is also lowered, and the energy interaction is reasonably utilized; the liquid phase change medium flows through the first precooler 17 and then is subjected to secondary temperature rising and evaporation by the heat accumulating device 7, so that the waste heat output by the absorption refrigerator 2 is beneficial to the secondary temperature rising and evaporation, and then flows into the heating device to be subjected to the secondary temperature rising by solar heat, the solar heat is fully utilized, the expansion energy releasing capacity is improved, and the overall energy consumption of the system is also saved. The gasified high-pressure phase-change medium is expanded by the first expander 15 to release energy, is cooled by the first precooler 17 and the second precooler 18, is expanded by the second expander 16 to release energy, is cooled and depressurized, and finally flows back to the first medium reservoir 8, so that the energy can be fully released, and the energy release and energy consumption ratio can be improved.

Through the steps, the method can fully utilize energy and save the energy consumption of the whole system. The method and the solar energy coupling energy storage system in the embodiment belong to the same conception, and have the corresponding steps and beneficial effects of using the solar energy coupling energy storage system. Technical details not described in detail in this embodiment may be referred to the solar energy coupling energy storage system provided in the embodiment of the present application, and will not be described herein again.

The basic principles of the present application have been described above in connection with specific embodiments, but it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be construed as necessarily possessed by the various embodiments of the application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not necessarily limited to practice with the above described specific details.

The components, arrangements, etc. referred to in this disclosure are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the drawings. These components, devices, may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

It is also noted that in the apparatus, devices and methods of the present application, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is to be construed as including any modifications, equivalents, and alternatives falling within the spirit and principles of the application.

Claims (10)

1. A solar energy coupled energy storage system, comprising:

a solar heat collection module (1) that absorbs solar energy and transfers heat to a heat transfer medium through which thermal energy is output;

The first medium reservoir (8) is used for outputting, receiving and storing the phase change medium and realizing energy storage or energy release through the state change of the phase change medium; the phase change medium may include or may be carbon dioxide;

The heat storage device is used for receiving and storing the heat transfer medium output by the solar heat collection module (1) and outputting heat energy in at least two ways, wherein one way of heat energy is used for heating the phase change medium so as to heat the phase change medium to improve the working capacity of the phase change medium;

and the absorption refrigerator (2) works through the other path of heat output by the heat storage device and outputs cold energy, and the cold energy is used for cooling the phase-change medium so as to enable the phase-change medium to be condensed and stored in a liquid state.

2. The solar-coupled energy storage system of claim 1, further comprising:

A compressor (10) for compressing the gaseous phase change medium with a first pressure value output by the first medium reservoir (8) to increase the pressure of the phase change medium;

A cold storage device (6) for absorbing cold energy output by the absorption refrigerator (2) and cooling the gaseous phase change medium output by the compressor (10) to output a liquid phase change medium;

A second medium reservoir (9) for receiving, storing and outputting the liquid phase change medium outputted from the cold accumulation device (6);

The booster pump (12) is connected with the liquid outlet of the second medium reservoir (9) so as to further increase the pressure of the phase-change medium;

heating means for heating the phase change medium output from the second medium reservoir (9) by heat of the heat transfer medium and outputting a gaseous phase change medium having a second pressure value;

A first expander (15) for outputting energy by expanding the gaseous phase-change medium having the second pressure value;

And the precooling device is used for cooling the gaseous phase-change medium output by the first expander (15) and conveying the phase-change medium subjected to pressure release and temperature reduction back to the first medium reservoir (8).

3. The solar-coupled energy storage system of claim 2, further comprising:

The heat recoverer (11) is arranged between the compressor (10) and the cold accumulation device (6), absorbs heat of the gaseous phase-change medium output by the compressor (10) through the heat transfer medium after temperature reduction, and conveys the heat transfer medium after heat absorption to the solar heat collection module (1).

4. The solar energy coupled energy storage system of claim 3, wherein the heat storage device comprises:

A high-temperature tank (5) for receiving and storing the heat transfer medium output by the solar heat collection module (1) and respectively conveying the heat transfer medium to the absorption refrigerator (2) and the heating device so as to output heat energy;

A low-temperature tank (3) which receives and stores the heat transfer medium outputted from the heating device and can convey the heat transfer medium to the heat recoverer (11) so that the heat recoverer (11) absorbs heat of the gaseous phase change medium outputted from the compressor (10) through the heat transfer medium;

And the medium-temperature tank (4) is used for receiving the heat transfer medium output by the absorption refrigerator (2) and the heat recoverer (11) and sending the heat transfer medium back to the solar heat collection module (1).

5. The solar coupled energy storage system of claim 2, wherein the pre-cooling device comprises a first pre-cooler (17) and a second pre-cooler (18);

the first flow passage of the first precooler (17) is connected with the liquid outlet of the booster pump (12), and the second flow passage is connected with the gas outlet of the first expander (15) so that the liquid phase-change medium output by the second medium reservoir (9) absorbs the heat of the gaseous phase-change medium output by the first expander (15);

The second precooler (18) is used for cooling the gaseous phase-change medium output by the first precooler (17) through cold energy output by the cold accumulation device (6).

6. The solar energy coupled energy storage system of claim 2 or 5, further comprising a thermal storage device (7) arranged between the heating device and the second medium reservoir (9), the thermal storage device (7) having a waste heat absorption channel (71) and a waste heat evaporation channel (72);

the waste heat absorption channel (71) is used for enabling the second medium output by the absorption refrigerator (2) to flow through and absorb heat of the second medium, and the waste heat evaporation channel (72) is used for enabling the liquid phase-change medium output by the second medium reservoir (9) or the first flow channel of the first precooler (17) to flow through so as to evaporate the phase-change medium through the waste heat output by the absorption refrigerator (2).

7. The solar energy coupling energy storage system of claim 4, wherein the heating device comprises a first heater (13) and a second heater (14) which are sequentially connected along the flowing direction of the phase change medium, and the heat transfer medium output by the high temperature tank (5) sequentially flows through the second heater (14) and the first heater (13) and then flows back to the low temperature tank (3).

8. The solar coupled energy storage system of claim 2, further comprising a second expander (16) disposed between the pre-cooling device and the first media store (8).

9. A solar energy coupling and storing method, suitable for use in a solar energy coupling and storing system according to any one of claims 1-8, comprising the following steps:

the heat transfer medium is heated by the solar heat collection module (1) to absorb heat energy;

delivering heat energy to the absorption refrigerator (2) through a first path to drive the absorption refrigerator (2) to work through the heat energy so as to generate cold energy and waste heat;

Providing thermal energy to the heating device through a second path;

When storing energy, the first medium reservoir (8) is opened to output a gaseous phase-change medium, the gaseous phase-change medium is pressurized, the pressurized gaseous phase-change medium is cooled by cold energy provided by the absorption refrigerator (2), and the condensed liquid phase-change medium is stored in the second medium reservoir (9), so that the phase-change medium is pressurized and absorbs the cold energy to store energy;

when releasing energy, the second medium reservoir (9) is opened to output liquid phase-change medium, the pressure is increased by the booster pump (12), the heating device is used for heating, and the heated phase-change medium releases energy by outputting energy through the expander and flows back to the first medium reservoir (8) after reducing the pressure and the temperature.

10. The solar energy coupled storage method of claim 9, further comprising the following:

When energy is released, the liquid phase-change medium output by the second medium reservoir (9) is boosted by the booster pump (12), then is cooled by the first precooler (17) to be heated, and then is absorbed by the heat storage device (7) to evaporate after heat output by the absorption refrigerator (2), and the gaseous phase-change medium is heated by the heating device;

The heated gaseous phase-change medium firstly outputs energy through a first expander (15), then is cooled through a first precooler (17) and a second precooler (18), then is cooled and depressurized through a second expander (16), and finally the gaseous phase-change medium flows back into the first medium reservoir (8).