Tower type concentrated solar power heat storage coupled heat pump electricity storage system

Abstract

The application provides a tower type concentrated solar energy heat storage and heat pump electricity storage system. A heliostat is used for reflecting sunlight to a heat absorbing tower; a first heat exchange pipeline, a hot molten salt storage tank, a second heat exchange pipeline and a cold molten salt storage tank are sequentially connected to form a molten salt heat storage loop; the first heat exchange pipeline passes through the heat absorbing tower, and the second heat exchange pipeline passes through a heat pump electricity storage device; the first heat exchange pipeline is provided with a first molten salt pump, and the second heat exchange pipeline is provided with a second molten salt pump. In this way, the tower type concentrated solar energy collector and the first heat exchange pipeline convert the intermittent and fluctuating solar energy into the heat energy of the molten salt in the hot molten salt storage tank, so that the heat pump electricity storage system can store the heat energy converted from the electric energy, and the heat energy input into the molten salt in the hot molten salt storage tank collected by the tower type concentrated solar energy collector can be used as supplement and adjustment, and the energy supply flexibility and stability of the tower type concentrated solar energy heat storage and heat pump electricity storage system are improved.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a tower-type concentrating solar thermal storage coupled with a heat pump for energy storage. Background Technology

[0002] Heat pump energy storage technology is an energy storage technology that converts electrical energy into heat energy for storage, and then converts the heat energy back into electrical energy for use when needed. In recent years, with the gradual maturation of solar thermal collection technology, in areas with abundant sunshine, solar energy collected by solar thermal collection equipment is converted into heat energy and transferred to a heat pump energy storage system. The heat pump energy storage system can then use the transferred heat energy to generate electricity.

[0003] Because solar energy is intermittent and fluctuating, directly transferring the heat energy collected and converted by solar thermal collectors to a heat pump energy storage system does not allow for flexible adjustment of the energy entering the system. Therefore, existing technologies suffer from poor system power supply flexibility and stability when solar thermal collectors coupled with heat pump energy storage systems are in operation. Summary of the Invention

[0004] This invention provides a tower-type concentrating solar thermal storage coupled with a heat pump for energy storage, in order to solve the problems of poor energy supply flexibility and stability in existing solar thermal collection coupled with heat pump energy storage systems.

[0005] This invention provides a tower-type concentrating solar thermal storage coupled with a heat pump for energy storage system, comprising: a heliostat, a heat-absorbing tower, a first heat exchange pipeline, a hot molten salt storage tank, a second heat exchange pipeline, a cold molten salt storage tank, a first molten salt pump, a second molten salt pump, and a heat pump energy storage device;

[0006] The heliostat is used to reflect sunlight onto the heat-absorbing tower;

[0007] The first heat exchange pipeline, the hot molten salt storage tank, the second heat exchange pipeline, and the cold molten salt storage tank are connected in sequence to form a molten salt heat storage circuit; the first heat exchange pipeline passes through the heat absorption tower, and the second heat exchange pipeline passes through the heat pump energy storage device; the first heat exchange pipeline is equipped with the first molten salt pump, and the second heat exchange pipeline is equipped with the second molten salt pump.

[0008] In this embodiment of the invention, the heliostat is used to reflect sunlight onto the heat-absorbing tower; the first heat exchange pipeline, the hot molten salt storage tank, the second heat exchange pipeline, and the cold molten salt storage tank are connected in sequence to form a molten salt thermal storage circuit; the first heat exchange pipeline passes through the heat-absorbing tower, and the second heat exchange pipeline passes through the heat pump energy storage device; the first heat exchange pipeline is equipped with the first molten salt pump, and the second heat exchange pipeline is equipped with the second molten salt pump. Thus, the heat pump energy storage device converts electrical energy into thermal energy for storage, and the tower-type concentrating solar collector and the first heat exchange pipeline convert intermittent, fluctuating solar energy into thermal energy stored in the molten salt in the hot molten salt storage tank. This allows the heat pump energy storage system to store thermal energy converted from electrical energy while simultaneously supplementing and regulating the input of thermal energy collected and converted into molten salt in the hot molten salt storage tank by the tower-type concentrating solar collector, thereby improving the energy supply flexibility and stability of the tower-type concentrating solar thermal storage coupled with the heat pump energy storage system. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of a tower-type concentrating solar thermal storage coupled with a heat pump energy storage system provided in an embodiment of the present invention;

[0011] Figure 2 This is a schematic diagram of the state of the tower-type concentrating solar thermal storage coupled heat pump energy storage system provided in the embodiment of the present invention, which uses electrical energy for energy storage.

[0012] Figure 3 This is a schematic diagram of the state of the tower-type concentrating solar thermal storage coupled heat pump energy storage system provided in the embodiment of the present invention, which utilizes solar energy for energy storage.

[0013] Figure 4 This is a schematic diagram of the tower-type concentrating solar thermal storage coupled heat pump energy storage system provided in an embodiment of the present invention in the energy release state. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0016] like Figure 1 As shown, this embodiment of the invention provides a tower-type concentrating solar thermal storage coupled with a heat pump for energy storage system, including: a heliostat 101, a heat-absorbing tower 102, a first heat exchange pipeline 103, a hot molten salt storage tank 104, a second heat exchange pipeline 105, a cold molten salt storage tank 106, a first molten salt pump 107, a second molten salt pump 108, and a heat pump energy storage device;

[0017] The heliostat 101 is used to reflect sunlight onto the heat absorption tower 102;

[0018] The first heat exchange pipeline 103, the hot molten salt storage tank 104, the second heat exchange pipeline 105, and the cold molten salt storage tank 106 are connected in sequence to form a molten salt heat storage circuit; the first heat exchange pipeline 103 passes through the heat absorption tower 102, and the second heat exchange pipeline 105 passes through the heat pump energy storage device; the first heat exchange pipeline 103 is equipped with the first molten salt pump 107, and the second heat exchange pipeline 105 is equipped with the second molten salt pump 108.

[0019] Optionally, in some embodiments, the number of heliostats 101 can be one or more, without further limitation. The orientation of the heliostats 101 can change with the direction of the sun to ensure that sunlight can be reflected onto the heat-absorbing tower 102 through the heliostats 101.

[0020] It should be noted that the above-mentioned heat absorption tower 102 can be composed of two parts: a heat absorber and a tower body. Furthermore, the heliostat 101 reflects sunlight onto the heat absorber.

[0021] It should be understood that the first end of the aforementioned first heat exchange pipeline 103 is connected to the hot molten salt storage tank 104, and the second end of the first heat exchange pipeline 103 is connected to the cold molten salt storage tank 106. The first heat exchange pipeline 103 passes through the absorber. The first molten salt pump 107 can be installed at the first end of the first heat exchange pipeline 103, at the second end of the first heat exchange pipeline 103, or on the first heat exchange pipeline 103 itself. Furthermore, when the first molten salt pump 107 is installed on the first heat exchange pipeline 103, the first molten salt pump 107 can be installed on the portion of the pipeline from the first end of the first heat exchange pipeline 103 to the absorber, or on the portion of the pipeline from the second end of the first heat exchange pipeline 103 to the absorber.

[0022] Optionally, the first end of the second heat exchange pipeline 105 is connected to the hot molten salt storage tank 104, and the second end of the second heat exchange pipeline 105 is connected to the cold molten salt storage tank 106. The second heat exchange pipeline 105 passes through the heat pump energy storage device. The second molten salt pump 108 can be installed at the first end of the second heat exchange pipeline 105, or at the second end of the second heat exchange pipeline 105, or on the first heat exchange pipeline 103. Further, when the second molten salt pump 108 is installed on the second heat exchange pipeline 105, the first molten salt pump 107 can be installed on the portion of the pipeline between the first end of the second heat exchange pipeline 105 and the heat pump energy storage device, or on the portion of the pipeline from the second end of the second heat exchange pipeline 105 to the heat pump energy storage device.

[0023] It should also be noted that the portion of the second heat exchange pipeline 105 located within the heat pump energy storage device can be spirally bent or serpentine bent; no further restrictions are imposed here.

[0024] It should be understood that in a scene with sunlight, the heliostat 101 reflects sunlight onto the absorber on the heat exchange tower 102. The first heat exchange pipe 103 passes through the absorber. The molten salt in the molten salt storage tank 106 enters the first heat exchange pipe 103 under the action of the first molten salt pump 107. When the molten salt is transferred to the part of the first heat exchange pipe 103 located inside the absorber, it exchanges heat with the absorber to produce hot molten salt. The hot molten salt is transferred to the hot molten salt storage tank 104 for storage. Under the action of the second molten salt pump 108, the hot molten salt is transferred in the second heat exchange pipe 105. When the hot molten salt is transferred to the part of the second heat exchange pipe 105 located inside the heat pump energy storage device, it exchanges heat with the heat pump energy storage device, and the hot molten salt is converted into molten salt. The molten salt is then transferred to the molten salt storage tank 106. Thus, the molten salt heat storage circuit completes one heat storage cycle.

[0025] It should be noted that the heliostat 101 is used to reflect sunlight onto the heat-absorbing tower 102; the first heat exchange pipeline 103, the hot molten salt storage tank 104, the second heat exchange pipeline 105, and the cold molten salt storage tank 106 are connected in sequence to form a molten salt heat storage circuit; the first heat exchange pipeline 103 passes through the heat-absorbing tower 102, and the second heat exchange pipeline 105 passes through the heat pump energy storage device; the first heat exchange pipeline 103 is equipped with the first molten salt pump 107, and the second heat exchange pipeline 105 is equipped with the second molten salt pump 108. In this way, the heat pump energy storage device converts electrical energy into thermal energy for storage, while the tower-type concentrating solar collector and the first heat exchange pipeline convert intermittent and fluctuating solar energy into thermal energy of molten salt in the hot molten salt storage tank for storage. Thus, while the heat pump energy storage system stores the thermal energy converted from electrical energy, it can also use the thermal energy input collected and converted by the tower-type concentrating solar collector into the hot molten salt storage tank as a supplement and regulator, thereby improving the energy supply flexibility and energy supply stability of the tower-type concentrating solar thermal storage coupled heat pump energy storage system.

[0026] Optionally, in some embodiments, the tower-type concentrating solar thermal storage coupled with heat pump energy storage system further includes: connecting pipes and a third molten salt pump 110;

[0027] The third molten salt pump 110 is provided in the connecting pipeline 109. The first end of the connecting pipeline is connected to the hot molten salt storage tank 104, and the second end of the connecting pipeline is connected to the cold molten salt storage tank 106.

[0028] Optionally, the third molten salt pump 110 can be installed in the connecting pipe 109 or at one end of the connecting pipe 109.

[0029] It should be understood that, under the action of the third molten salt pump 110, hot molten salt can enter the cold molten salt storage tank 106 through the connecting pipe 109, and cold molten salt can also enter the hot molten salt storage tank 104 through the connecting pipe 109.

[0030] It should be noted that the third molten salt pump 110 is installed in the connecting pipe 109. The first end of the connecting pipe is connected to the hot molten salt storage tank 104, and the second end of the connecting pipe is connected to the cold molten salt storage tank 106. In this way, the molten salt in the hot molten salt storage tank 104 and the cold molten salt storage tank 106 can be exchanged, thereby regulating the temperature of some pipelines in the molten salt heat storage circuit when it is too high or too low.

[0031] like Figure 2 , Figure 3 and Figure 4 As shown, the heat pump energy storage device includes: an electric motor 21, a generator 22, and a heat energy conversion component;

[0032] The electric motor 21 is used to connect to an external power source and convert the electrical energy of the power source into kinetic energy;

[0033] The heat energy conversion component is connected to the output shaft of the motor 21, and the heat energy conversion component can be used to convert the kinetic energy into heat energy for storage.

[0034] The second heat exchange pipe 105 passes through the heat conversion assembly;

[0035] The input shaft of the generator 22 is connected to the thermal energy conversion component, and the thermal energy conversion component can be used to convert the stored thermal energy into kinetic energy to control the operation of the generator 22.

[0036] Optionally, the motor 21 is used to connect to an external power source, which can be understood as the motor 21 being electrically connected to the power source.

[0037] It should be understood that the heat pump energy storage device in the embodiments of this application may include an energy storage process and an energy release process.

[0038] In the energy storage process, the power source first provides electrical energy to the motor 21, which drives the motor 21 to move, thereby converting electrical energy into kinetic energy. Then, the kinetic energy is converted into heat energy and stored through the heat energy conversion component. Secondly, the second heat exchange pipe 105 passes through the heat energy conversion component. The part of the second heat exchange pipe 105 located inside the heat energy conversion component exchanges heat with the heat energy conversion component, transferring heat energy to the heat energy conversion component and storing it.

[0039] During the energy release process, since the thermal energy conversion component has stored thermal energy during the energy storage process, the thermal energy conversion component converts the stored thermal energy into kinetic energy, and then transmits the kinetic energy to the generator 22 through the transmission connection. The generator 22 converts the kinetic energy into electrical energy.

[0040] It should be noted that the motor 21 is used to connect to an external power source and convert the electrical energy of the power source into kinetic energy; the heat energy conversion component is driven by the output shaft of the motor 21, and the heat energy conversion component can be used to convert the kinetic energy into heat energy for storage; the second heat exchange pipe 105 passes through the heat energy conversion component; the input shaft of the generator 22 is driven by the heat energy conversion component, and the heat energy conversion component can be used to convert the stored heat energy into kinetic energy to control the operation of the generator 22. In this way, electrical energy can be converted into heat energy for storage when it is not needed, and heat energy collected by solar energy devices can also be stored; when electrical energy is needed, heat energy can be converted into electrical energy for use, thus improving the availability of energy.

[0041] Optionally, in some embodiments, the heat energy conversion assembly includes: a compressor 231, a heat storage tank 232, a turbine 233, a cold storage tank 234, a first three-way valve 235, a second three-way valve 236, a third three-way valve 237, and a fourth three-way valve 238;

[0042] The first end of the compressor 231 is connected to the first branch end of the first three-way valve 235 and the first branch end of the second three-way valve 236, respectively; the second end of the compressor 231 is connected to the first branch end of the third three-way valve 237 and the first branch end of the fourth three-way valve 238, respectively; the first end of the turbine 233 is connected to the second branch end of the first three-way valve 235 and the second branch end of the second three-way valve 236, respectively; the second end of the turbine 233 is connected to the second branch end of the third three-way valve 237 and the second branch end of the fourth three-way valve 238, respectively.

[0043] The common end of the first three-way valve 235 is connected to the first end of the heat storage tank 232, the second end of the heat storage tank 232 is connected to the common end of the second three-way valve 236, the common end of the third three-way valve 237 is connected to the first end of the cold storage tank 234, and the second end of the cold storage tank 234 is connected to the common end of the fourth three-way valve 238.

[0044] The second heat exchange pipeline 105 passes through the heat storage tank 232;

[0045] The compressor 231 is driven to the output shaft of the motor 21, and the turbine 233 is driven to the input shaft of the generator 22.

[0046] Optionally, in some embodiments, the thermal energy conversion component may further include a controller, which is electrically connected to the first three-way valve 235, the second three-way valve 236, the third three-way valve 237, and the fourth three-way valve 238, respectively.

[0047] It should be noted that during the above energy storage process, the heat pump energy storage device can be understood as being in an energy storage state. In this state, the operation of each component in the heat energy conversion assembly is as follows: Driven by the motor 21, the compressor 231 compresses the working fluid located within it. The working fluid changes from normal temperature and pressure to high temperature and pressure. At this time, the first branch of the first three-way valve 235 is connected to the common branch, allowing the working fluid to enter the heat storage tank 232 via the first three-way valve 235. There, it exchanges heat with the heat storage medium within the heat storage tank 232, storing the heat energy. Simultaneously, the common branch of the second three-way valve 236 is connected to the second branch, allowing the working fluid to enter the turbine 233 via the second three-way valve 236. The turbine 233 compresses the working fluid, and the working fluid... When switching to low temperature and low pressure, the common end of the fourth three-way valve 238 is connected to the second branch end. The working fluid enters the cold storage tank 234 through the fourth three-way valve 238 and exchanges heat with the cold storage medium in the cold storage tank 234, storing the cold energy in the cold storage tank 234. At this point, the common end of the third three-way valve 237 is connected to the first branch end, and the working fluid enters the compressor 231 through the third three-way valve 237, thus completing one energy storage cycle. When the motor 21 does not drive the compressor 231 to rotate, the second heat exchange pipe 105 passes through the heat storage tank 232. The part of the second heat exchange pipe 105 located in the heat storage tank 232 fully exchanges heat with the heat storage medium in the heat storage tank 232, transferring the heat energy to the heat storage tank 232 and storing it.

[0048] During the aforementioned energy release process, the heat pump energy storage device can be understood as being in an energy release state. In this state, the operation of each component in the heat energy conversion assembly is as follows: The heat storage tank 232 stores a high-temperature, high-pressure working fluid. At this time, the common end of the first three-way valve 235 is connected to the second branch end. The working fluid enters the turbine 233 through the first three-way valve 235. The working fluid expands, driving the turbine 233 to rotate. The turbine 233 then drives the generator 22 to rotate, generating electricity. At this time, the third... The common end of the three-way valve 237 is connected to the second branch end. After the working fluid expands, it enters the cold storage tank 234 through the third three-way valve 237. At this time, the common end of the fourth three-way valve 238 is connected to the first branch end. The working fluid enters the compressor 231 through the fourth three-way valve 238. The working fluid is compressed, which drives the compressor 231 to compress. Here, the common end of the second three-way valve 236 is connected to the first branch end. The working fluid enters the heat storage tank 232 through the second three-way valve 236, thus completing one energy release cycle.

[0049] Optionally, in some embodiments, the heat pump energy storage device further includes: a first housing 24, a first gear assembly, and a second gear assembly;

[0050] The first gear assembly and the second gear assembly are disposed inside the first housing 24 and are connected to the first housing 24;

[0051] The first gear assembly is driven to the output shaft of the motor 21, and the second gear assembly is driven to the compressor 231, and the first gear assembly and the second gear assembly are meshed together.

[0052] In this embodiment of the application, the first gear assembly, the second gear assembly, and the first housing 24 constitute the first gearbox.

[0053] In this embodiment, the first gear assembly is fixedly connected to the first housing 24, and the second gear assembly is movably connected to the housing, and can move between a first position and a second position. When in the first position, the first gear assembly and the second gear assembly are meshed, and the heat pump energy storage device is in an energy storage state. When in the second position, the first gear assembly and the second gear assembly are not meshed, and the non-meshing connection can also be referred to as the released meshing state.

[0054] Furthermore, it should be noted that the first gear assembly includes a first connecting shaft and a first gear disposed on the first connecting shaft. The fixed connection between the first gear assembly and the first housing 24 can be understood as the two ends of the first connecting shaft being fixedly connected to the first housing 24.

[0055] The second gear assembly includes a second connecting shaft and a second gear disposed on the second connecting shaft. The second gear assembly is movably connected to the first housing 24, which can be understood as the two ends of the second connecting shaft being slidably connected to the first housing 24. The first housing 24 is provided with a first limiting structure and a second limiting structure. When the two ends of the second connecting shaft are located at the first limiting structure, the first gear assembly and the second gear assembly are meshed. When the two ends of the second connecting shaft are located at the second limiting structure, the first gear assembly and the second gear assembly are not meshed.

[0056] It should be understood that the first gear assembly and the second gear assembly are disposed within and connected to the first housing 24; the first gear assembly is driven by the motor 21, and the second gear assembly is driven by the compressor 231, and the first gear assembly and the second gear assembly are meshed together. This allows the heat pump energy storage device to be in an energy storage state whether or not the heat energy conversion component is connected to the motor 21. If connected, the heat pump energy storage device is always in an energy storage state; if not connected, the heat pump energy storage device is in an energy storage state when the second heat exchange pipeline 105 exchanges heat with the heat storage tank 232. This allows the drive connection with the motor 21 to be disconnected when the motor 21 is not needed to provide kinetic energy.

[0057] Optionally, in some embodiments, the heat pump energy storage device further includes: a second housing 25, a third gear assembly, and a fourth gear assembly;

[0058] The third gear assembly and the fourth gear assembly are disposed inside the second housing 25 and are connected to the second housing 25;

[0059] The third gear assembly is driven by the turbine 233, and the fourth gear assembly is driven by the generator 22, and the third gear assembly and the fourth gear assembly are meshed together.

[0060] In this embodiment, the third gear assembly, the fourth gear assembly, and the second housing 25 constitute the second gearbox.

[0061] In this embodiment, the third gear assembly is fixedly connected to the second housing 25, and the fourth gear assembly is movably connected to the second housing 25, and can move between the third position and the fourth position. When it is in the third position, the third gear assembly and the fourth gear assembly are meshed and connected, and the heat pump energy storage device is in an energy release state. When it is in the fourth position, the third gear assembly and the fourth gear assembly are not meshed and are in a released meshing state.

[0062] Furthermore, it should be noted that the third gear assembly includes a third connecting shaft and a third gear disposed on the third connecting shaft. The fixed connection between the third gear assembly and the second housing 25 can be understood as the two ends of the third connecting shaft being fixedly connected to the second housing 25.

[0063] The fourth gear assembly includes a fourth connecting shaft and a fourth gear disposed on the fourth connecting shaft. The fourth gear assembly is movably connected to the second housing 25, which can be understood as the two ends of the fourth connecting shaft being slidably connected to the second housing 25. The second housing 25 is provided with a third limiting structure and a fourth limiting structure. When the two ends of the fourth connecting shaft are located at the third limiting structure, the third gear assembly and the fourth gear assembly are meshed. When the two ends of the third connecting shaft are located at the fourth limiting structure, the third gear assembly and the fourth gear assembly are not meshed.

[0064] It should be understood that the third gear assembly and the fourth gear assembly are disposed within and connected to the second housing 25; the third gear assembly is driven by the turbine 233, and the fourth gear assembly is driven by the generator 22, and the third gear assembly and the fourth gear assembly are meshed together. In this way, the thermal energy conversion component is connected to the generator 22. If connected, the heat pump energy storage device is in an energy release state; if not connected, the heat pump energy storage device is not in an energy release state.

[0065] Optionally, in some embodiments, both the hot molten salt storage tank 104 and the cold molten salt storage tank 106 are equipped with electric heaters.

[0066] It should be understood that electric heaters are installed in both the hot molten salt storage tank 104 and the cold molten salt storage tank 106 to provide the necessary heat to ensure that the molten salt in the tanks does not solidify when the molten salt in the hot molten salt storage tank 104 and the cold molten salt storage tank 106 is below the freezing point.

[0067] Optionally, in some embodiments, a flow distribution pipe is provided at the bottom of both the hot molten salt storage tank 104 and the cold molten salt storage tank 106.

[0068] Optionally, in some embodiments, the first heat exchange pipeline 103, the hot molten salt storage tank 104, the second heat exchange pipeline 105, and the cold molten salt storage tank 106 are equipped with an electric heat tracing system.

[0069] It should be understood that the first heat exchange pipeline 103, the hot molten salt storage tank 104, the second heat exchange pipeline 105 and the cold molten salt storage tank 106 are equipped with an electric heat tracing system to provide the necessary heat to ensure that the molten salt in the pipeline does not solidify when the molten salt is below the freezing point.

[0070] Optionally, in some embodiments, at least one molten salt is provided in the molten salt thermal storage circuit.

[0071] It should be noted that molten salts can be KNO3, NaNO3, NaNO2, and Ca(NO3)2, etc.

[0072] Furthermore, the composition of binary molten salt can be 40% KNO3 and 60% NaNO3; the composition of ternary molten salt can be 7% NaNO3, 53% KNO3 and 40% NaNO2, or 45% KNO3, 48% Ca(NO3)2 and 7% NaNO3, as well as other molten salts with KNO3, NaNO3, NaNO2, Ca(NO3)2, etc. as components.

[0073] Optionally, in some embodiments, the first heat exchange pipeline and the second heat exchange pipeline are provided with switching valves.

[0074] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A tower-type concentrating solar thermal storage coupled with a heat pump for energy storage system, characterized in that, The tower-type concentrating solar thermal storage coupled with heat pump energy storage system includes: a heliostat, a heat-absorbing tower, a first heat exchange pipeline, a hot molten salt storage tank, a second heat exchange pipeline, a cold molten salt storage tank, a first molten salt pump, a second molten salt pump, and a heat pump energy storage device. The heliostat is used to reflect sunlight onto the heat-absorbing tower; The first heat exchange pipeline, the hot molten salt storage tank, the second heat exchange pipeline, and the cold molten salt storage tank are connected in sequence to form a molten salt heat storage circuit; the first heat exchange pipeline passes through the heat absorption tower, and the second heat exchange pipeline passes through the heat pump energy storage device; the first heat exchange pipeline is equipped with the first molten salt pump, and the second heat exchange pipeline is equipped with the second molten salt pump; The tower-type concentrating solar thermal storage coupled heat pump energy storage system also includes: connecting pipes and a third molten salt pump; The connecting pipe is equipped with the third molten salt pump, the first end of the connecting pipe is connected to the hot molten salt storage tank, and the second end of the connecting pipe is connected to the cold molten salt storage tank; The heat pump energy storage device includes: an electric motor, a generator, and a heat energy conversion component; The electric motor is used to connect to an external power source and convert the electrical energy of the power source into kinetic energy; The heat energy conversion component is connected to the output shaft of the electric motor, and the heat energy conversion component can be used to convert the kinetic energy into heat energy for storage. The second heat exchange pipeline passes through the heat conversion assembly; The input shaft of the generator is connected to the thermal energy conversion component, and the thermal energy conversion component can be used to convert stored thermal energy into kinetic energy to control the operation of the generator. The heat energy conversion assembly includes: a compressor, a heat storage tank, a turbine, a cold storage tank, a first three-way valve, a second three-way valve, a third three-way valve, and a fourth three-way valve; The first end of the compressor is connected to the first branch end of the first three-way valve and the first branch end of the second three-way valve, respectively; the second end of the compressor is connected to the first branch end of the third three-way valve and the first branch end of the fourth three-way valve, respectively; the first end of the turbine is connected to the second branch end of the first three-way valve and the second branch end of the second three-way valve, respectively; the second end of the turbine is connected to the second branch end of the third three-way valve and the second branch end of the fourth three-way valve, respectively. The common end of the first three-way valve is connected to the first end of the heat storage tank, the second end of the heat storage tank is connected to the common end of the second three-way valve, the common end of the third three-way valve is connected to the first end of the cold storage tank, and the second end of the cold storage tank is connected to the common end of the fourth three-way valve. The second heat exchange pipeline passes through the heat storage tank; The compressor is driven to the output shaft of the electric motor, and the turbine is driven to the input shaft of the generator.

2. The tower-type concentrating solar thermal storage coupled with a heat pump energy storage system according to claim 1, characterized in that, The heat pump energy storage device further includes: a first housing, a first gear assembly, and a second gear assembly; The first gear assembly and the second gear assembly are disposed within the first housing and are connected to the first housing; The first gear assembly is driven to the output shaft of the electric motor, and the second gear assembly is driven to the compressor, and the first gear assembly and the second gear assembly are meshed together.

3. The tower-type concentrating solar thermal storage coupled with a heat pump energy storage system according to claim 2, characterized in that, The heat pump energy storage device also includes: a second housing, a third gear assembly, and a fourth gear assembly; The third gear assembly and the fourth gear assembly are disposed within the second housing and are connected to the second housing; The third gear assembly is connected to the turbine drive, and the fourth gear assembly is connected to the generator drive, and the third gear assembly and the fourth gear assembly are meshed together.

4. The tower-type concentrating solar thermal storage coupled with a heat pump energy storage system according to claim 1, characterized in that, Both the hot molten salt storage tank and the cold molten salt storage tank are equipped with electric heaters.

5. The tower-type concentrating solar thermal storage coupled with a heat pump energy storage system according to claim 1, characterized in that, The first heat exchange pipeline, the hot molten salt storage tank, the second heat exchange pipeline, and the cold molten salt storage tank are equipped with an electric heat tracing system.

6. The tower-type concentrating solar thermal storage coupled with a heat pump energy storage system according to claim 1, characterized in that, The molten salt thermal storage circuit contains at least one type of molten salt.

7. The tower-type concentrating solar thermal storage coupled with a heat pump energy storage system according to claim 1, characterized in that, The first heat exchange pipeline and the second heat exchange pipeline are equipped with on / off valves.

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