A combined tower-tank solar-thermal compressed air energy storage system

Abstract

The present invention discloses a tower-tank combined solar-thermal composite compressed air energy storage system, which relates to the technical field of energy storage and includes: an air compression branch, which is successively connected in series by a compressor, a compression-side heat exchanger, and a gas storage device; an air expansion branch, which is successively connected in series by a gas storage device, an expansion-side preheater, an expansion-side reheater, and an expander; a compression heat cycle, which is connected in series from head to tail by a compression heat low-temperature working fluid storage tank, a compression-side heat exchanger, a compression heat high-temperature working fluid storage tank, and an expansion-side preheater; a trough solar thermal power generation cycle, which is connected in series from head to tail by a compression heat high-temperature working fluid storage tank, a trough solar thermal field, a trough solar thermal high-temperature working fluid storage tank, and a Rankine cycle device; a tower solar thermal cycle, which is connected in series from head to tail by a tower solar thermal low-temperature working fluid storage tank, a tower solar thermal collector, a tower solar thermal high-temperature working fluid storage tank, and an expansion-side reheater. This system applies compressed air energy storage to the consumption and utilization of clean heat energies such as geothermal energy and solar thermal energy.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and more particularly, to a tower-tank combined solar thermal composite compressed air energy storage system. Background Art

[0002] In the prior art, energy storage is an important supporting technology for new energy consumption and energy transformation. As a new type of physical energy storage technology, compressed air energy storage has advantages such as low dependence on geographical conditions, long service life, and large-scale scalability. Currently, there are two types of compressed air energy storage technologies that have been verified by engineering practice. One is the fuel-complemented system, which stores high-pressure air in a gas storage device by using a compressor during energy storage, and the high-pressure air stored in the gas storage device drives an expander to generate electricity during energy release. To improve the power generation efficiency, the fuel-complemented technology burns natural gas to significantly increase the intake temperature of the expander. The other is the non-fuel-complemented system, in which the heat source for heating the intake temperature of the expander comes from the compression heat recovered during the compression process, thus achieving completely clean carbon-free emissions.

[0003] Although compressed air energy storage has the above advantages, there is still room for improvement in the non-fuel-complemented compressed air energy storage. From the perspective of system performance, since the expansion process uses the recovered compression heat, the compressor power consumption during energy storage and the expander output during energy release restrict each other. Pursuing low power consumption will result in too low a grade of compression heat and reduce the expander output, and vice versa. From the perspective of the degree of clean energy consumption of the system, since the non-fuel-complemented compressed air energy storage has a thermal energy interface on both the compression side and the expansion side, this technology still has great potential in consuming and utilizing clean thermal energy such as geothermal energy and solar thermal energy.

[0004] In summary, how to apply compressed air energy storage to the consumption and utilization of clean thermal energy such as geothermal energy and solar thermal energy is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a tower-tank combined solar thermal composite compressed air energy storage system, which can fully apply compressed air energy storage to the consumption and utilization of clean thermal energy such as geothermal energy and solar thermal energy.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A tower-tank combined solar thermal composite compressed air energy storage system, comprising:

[0008] An air compression branch, which is sequentially connected in series by a compressor, a compression-side heat exchanger, and a gas storage device;

[0009] An air expansion branch, which is composed of the gas storage device, an expansion-side preheater, an expansion-side reheater, and an expander connected in series in sequence;

[0010] A compression heat cycle, which is composed of a compression heat low-temperature working fluid storage tank, the compression-side heat exchanger, a compression heat high-temperature working fluid storage tank, and the expansion-side preheater connected in series end to end;

[0011] A trough solar thermal power generation cycle, which is composed of the compression heat high-temperature working fluid storage tank, a trough solar thermal field, a trough solar thermal high-temperature working fluid storage tank, and a Rankine cycle device connected in series end to end;

[0012] A tower solar thermal cycle, which is composed of a tower solar thermal low-temperature working fluid storage tank, a tower solar thermal collector, a tower solar thermal high-temperature working fluid storage tank, and the expansion-side reheater connected in series end to end.

[0013] Preferably, a compression heat low-temperature working fluid pump is provided between the compression heat low-temperature working fluid storage tank and the compression-side heat exchanger, and a compression heat high-temperature working fluid pump is provided between the compression heat high-temperature working fluid storage tank and the expansion-side preheater.

[0014] Preferably, a trough solar thermal field working fluid pump is provided between the compression heat high-temperature working fluid storage tank and the trough solar thermal field, and a trough solar thermal high-temperature working fluid pump is provided between the trough solar thermal high-temperature working fluid storage tank and the Rankine cycle device.

[0015] Preferably, a tower solar thermal working fluid pump is provided between the tower solar thermal low-temperature working fluid storage tank and the tower solar thermal collector, and a tower solar thermal high-temperature working fluid pump is provided between the tower solar thermal high-temperature working fluid storage tank and the expansion-side reheater.

[0016] Preferably, fixed mirror fields for reflecting solar energy are symmetrically provided on both sides of the tower solar thermal collector.

[0017] Preferably, the compressor is connected to an electric motor, and the expander is connected to a generator.

[0018] Preferably, the working fluids of the compression heat cycle and the trough solar thermal power generation cycle are both heat transfer oils, and the working fluid of the tower solar thermal cycle is molten salt.

[0019] Preferably, the compressor and the compression-side heat exchanger are connected in series in sequence to form a first branch, and a plurality of the first branches are all connected to the gas storage device to form the air compression branch;

[0020] The expansion-side preheater, the expansion-side reheater, and the expander are connected in series in sequence to form a second branch, and a plurality of the second branches are all connected to the gas storage device to form the air expansion branch.

[0021] When using the tower-tank combined solar-thermal hybrid compressed air energy storage system provided by the present invention, the compressor, the compression-side heat exchanger, the gas storage device, the compressed heat low-temperature working fluid storage tank, and the compressed heat high-temperature working fluid storage tank jointly complete the decoupling of valley electricity or photovoltaic output into air pressure energy release and heat energy storage.

[0022] The compressed heat high-temperature working fluid storage tank, the trough solar collector field, and the trough solar collector high-temperature working fluid storage tank store solar thermal energy by trough solar collection technology, while the tower solar collector low-temperature working fluid storage tank, the tower solar collector, and the tower solar collector high-temperature working fluid storage tank store solar thermal energy by tower solar collection technology.

[0023] The trough solar collector high-temperature working fluid storage tank, the Rankine cycle device, and the compressed heat high-temperature working fluid storage tank jointly convert solar thermal energy into electrical energy output;

[0024] The gas storage device, the expansion-side preheater, the expansion-side reheater, the expander, the tower solar collector high-temperature working fluid storage tank, and the tower solar collector low-temperature working fluid storage tank jointly convert air pressure potential energy and solar thermal energy into electrical energy output.

[0025] This system fully combines the advantages of three major technologies: compressed air energy storage, trough solar thermal collection, and tower solar thermal collection. While realizing the basic functions of compressed air energy storage, it also has the following advantages. First, this system fully expands the energy interface of general non-supplementary combustion compressed air energy storage technology. By introducing a trough solar thermal collection system and a tower solar collection system on the compression side and the expansion side respectively, it greatly enhances the further consumption of renewable energy by compressed air energy storage technology. Second, this system greatly improves the quality of compressed heat and expansion heat through solar thermal collection technology, enabling the compressed heat temperature to be increased to drive Rankine cycle power generation, thus greatly improving the economy of the system. In addition, the operation of each device in this system can fully consider the peak-valley electricity price and the volatility of solar energy, making the system more economical when used for peak shaving and valley filling, and capable of successfully smoothing the fluctuating output when used to consume solar energy. Finally, the three major technologies integrated in this system (non-supplementary combustion compressed air energy storage, trough solar collection, and tower solar collection) have all been successfully commercialized, ensuring the smooth implementation of this system.

[0026] In summary, the tower-tank combined solar-thermal hybrid compressed air energy storage system provided by the present invention can make full use of compressed air energy storage in consuming and utilizing clean heat energies such as geothermal energy and solar thermal energy. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0028] Figure 1 This is a schematic structural diagram of the tower-tank combined solar-thermal composite compressed air energy storage system provided by the present invention.

[0029] Figure 1 In which:

[0030] 1 is a compressor, 2 is a compression-side heat exchanger, 3 is a gas storage device, 4 is an expansion-side preheater, 5 is an expansion-side reheater, 6 is an expander, 7 is a compressed-heat low-temperature working fluid storage tank, 8 is a compressed-heat low-temperature working fluid pump, 9 is a compressed-heat high-temperature working fluid storage tank, 10 is a compressed-heat high-temperature working fluid pump, 11 is a trough-type solar field working fluid pump, 12 is a trough-type solar field, 13 is a trough-type solar-heated high-temperature working fluid storage tank, 14 is a trough-type solar-heated high-temperature working fluid pump, 15 is a Rankine cycle device, 16 is a tower-type solar-heated low-temperature working fluid storage tank, 17 is a tower-type solar-heated working fluid pump, 18 is a tower-type solar collector, 19 is a heliostat field, 20 is a tower-type solar-heated high-temperature working fluid storage tank, 21 is a tower-type solar-heated high-temperature working fluid pump. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] The core of the present invention is to provide a tower-tank combined solar-thermal composite compressed air energy storage system, which can make full use of compressed air energy storage in aspects such as consuming and utilizing clean heat energies such as geothermal energy and solar thermal energy.

[0033] Please refer to Figure 1 , Figure 1 This is a schematic structural diagram of the tower-tank combined solar-thermal composite compressed air energy storage system provided by the present invention.

[0034] This specific embodiment provides a tower-tank combined solar-thermal composite compressed air energy storage system, including:

[0035] An air compression branch, which is successively connected in series by a compressor 1, a compression-side heat exchanger 2, and a gas storage device 3;

[0036] An air expansion branch, which is successively connected in series by a gas storage device 3, an expansion-side preheater 4, an expansion-side reheater 5, and an expander 6;

[0037] A compressed-heat cycle, which is successively connected in series at the head and tail by a compressed-heat low-temperature working fluid storage tank 7, a compression-side heat exchanger 2, a compressed-heat high-temperature working fluid storage tank 9, and an expansion-side preheater 4;

[0038] The trough solar thermal power generation cycle is composed of a compressed heat high-temperature working fluid storage tank 9, a trough solar thermal field 12, a trough solar thermal high-temperature working fluid storage tank 13, and a Rankine cycle device 15 connected in series from beginning to end;

[0039] The tower solar thermal cycle is composed of a tower solar thermal low-temperature working fluid storage tank 16, a tower solar collector 18, a tower solar thermal high-temperature working fluid storage tank 20, and an expansion-side reheater 5 connected in series from beginning to end.

[0040] When using the tower-trough combined solar thermal composite compressed air energy storage system provided by the present invention, the compressor 1, the compression-side heat exchanger 2, the gas storage device 3, the compressed heat low-temperature working fluid storage tank 7, and the compressed heat high-temperature working fluid storage tank 9 jointly complete decoupling valley electricity or photovoltaic power output into air pressure energy release and thermal energy storage.

[0041] The compressed heat high-temperature working fluid storage tank 9, the trough solar thermal field 12, and the trough solar thermal high-temperature working fluid storage tank 13 store solar thermal energy by trough solar thermal technology, while the tower solar thermal low-temperature working fluid storage tank 16, the tower solar collector 18, and the tower solar thermal high-temperature working fluid storage tank 20 store solar thermal energy by tower solar thermal technology.

[0042] The trough solar thermal high-temperature working fluid storage tank 13, the Rankine cycle device 15, and the compressed heat high-temperature working fluid storage tank 9 jointly convert solar thermal energy into electric energy for output;

[0043] The gas storage device 3, the expansion-side preheater 4, the expansion-side reheater 5, the expander 6, the tower solar thermal high-temperature working fluid storage tank 20, and the tower solar thermal low-temperature working fluid storage tank 16 jointly convert air pressure potential energy and solar thermal energy into electric energy for output.

[0044] This system fully combines the advantages of three major technologies: compressed air energy storage, trough solar thermal collection, and tower solar thermal collection. While realizing the basic functions of compressed air energy storage, it also has the following advantages. First, this system fully expands the energy interface of general non-supplementary combustion compressed air energy storage technology. By introducing a trough solar thermal collection system and a tower solar thermal collection system on the compression side and the expansion side respectively, it greatly enhances the further consumption of renewable energy by compressed air energy storage technology. Second, this system greatly improves the quality of compressed heat and expansion heat through solar thermal collection technology, enabling the compressed heat temperature to be increased to drive Rankine cycle power generation, thus greatly improving the economy of the system. In addition, the operation of each device in this system can fully consider the peak-valley electricity price and the volatility of solar energy, making the system more economical when used for peak shaving and valley filling, and enabling it to successfully smooth the fluctuating power output when used to consume solar energy. Finally, the three major technologies integrated in this system (non-supplementary combustion compressed air energy storage, trough solar thermal collection, and tower solar thermal collection) have all been successfully commercialized, ensuring the smooth implementation of this system.

[0045] In summary, the tower-tank combined solar-thermal hybrid compressed air energy storage system provided by the present invention can make full use of compressed air energy storage in the aspects of consuming and utilizing clean heat energy such as geothermal energy and solar thermal energy.

[0046] Based on the above embodiments, preferably, a compressed heat low-temperature working fluid pump 8 is provided between the compressed heat low-temperature working fluid storage tank 7 and the compression-side heat exchanger 2, and a compressed heat high-temperature working fluid pump 10 is provided between the compressed heat high-temperature working fluid storage tank 9 and the expansion-side preheater 4. That is, a compressed heat cycle is formed by connecting the compressed heat low-temperature working fluid storage tank 7, the compressed heat low-temperature working fluid pump 8, the compression-side heat exchanger 2, the compressed heat high-temperature working fluid storage tank 9, the compressed heat high-temperature working fluid pump 10, and the expansion-side preheater 4 in series end to end.

[0047] Preferably, a trough-type solar collector field working fluid pump 11 is provided between the compressed heat high-temperature working fluid storage tank 9 and the trough-type solar collector field 12, and a trough-type solar collector high-temperature working fluid pump 14 is provided between the trough-type solar collector high-temperature working fluid storage tank 13 and the Rankine cycle device 15. That is, a trough-type solar collector power generation cycle is formed by connecting the compressed heat high-temperature working fluid storage tank 9, the trough-type solar collector field working fluid pump 11, the trough-type solar collector field 12, the trough-type solar collector high-temperature storage tank 13, the trough-type solar collector high-temperature working fluid pump 14, and the Rankine cycle device 15 in series end to end.

[0048] Preferably, a tower-type solar collector low-temperature working fluid pump 17 is provided between the tower-type solar collector low-temperature working fluid storage tank 16 and the tower-type solar collector 18, and a tower-type solar collector high-temperature working fluid pump 21 is provided between the tower-type solar collector high-temperature working fluid storage tank 20 and the expansion-side reheater 5. That is, a tower-type solar collector cycle is formed by connecting the tower-type solar collector low-temperature working fluid storage tank 16, the tower-type solar collector low-temperature pump 17, the tower-type solar collector 18, the tower-type solar collector low-temperature working fluid storage tank 20, the tower-type solar collector high-temperature pump 21, and the expansion-side reheater 5 in series end to end.

[0049] Based on the above embodiments, preferably, heliostat fields 19 for reflecting solar energy are symmetrically arranged on both sides of the tower-type solar collector 18. Therefore, the tower-type solar collector low-temperature working fluid stored in the tower-type solar collector low-temperature working fluid storage tank 16 flows into the tower-type solar collector 18 under the action of the tower-type solar collector low-temperature pump 17 to absorb the solar energy reflected by the heliostat fields 19. After the working fluid is heated to the maximum allowable temperature (usually 580 °C), it is stored in the tower-type solar collector high-temperature working fluid storage tank 20.

[0050] Preferably, the compressor 1 is connected to the motor, and the expander 6 is connected to the generator. That is, the compressor 1 can be driven by the motor, and the expander 6 can drive the generator to operate. Moreover, the compressor 1 can also be driven by other mechanisms, and the expander can drive other mechanisms to operate.

[0051] Preferably, the working fluids of the compressed heat cycle and the trough-type solar collector power generation cycle are both heat-conducting oils, and the working fluid of the tower-type solar collector cycle is molten salt.

[0052] It should be noted that, starting from the actual requirements of saving work on the compression side and doing more work on the expansion side of the system, the allowable temperature ranges of the two currently mainstream heat storage and heat exchange working fluids, namely thermal oil and molten salt, are fully utilized, thus getting rid of the mutual restriction between the compression heat and the expansion heat in a general non-supplementary combustion compressed air energy storage system.

[0053] Preferably, the compressor 1 and the compression-side heat exchanger 2 are connected in series in sequence to form a first branch, and multiple first branches are all connected to the gas storage device 3 to form an air compression branch;

[0054] The expansion-side preheater 4, the expansion-side reheater 5, and the expander 6 are connected in series in sequence to form a second branch, and multiple second branches are all connected to the gas storage device 3 to form an air expansion branch.

[0055] In order to further illustrate the tower-tank combined solar thermal composite compressed air energy storage system provided by the present invention, an example is given below for illustration.

[0056] Example 1: The peak shaving and valley filling application scenario of the tower-tank combined solar thermal composite compressed air energy storage system.

[0057] During the valley filling period from 00:00 at night to 8:00 in the morning, the system decouples the valley electricity into air pressure potential energy and thermal energy for storage. The specific implementation steps are as follows: The compressor 1 operates driven by low-valley electricity, inhaling ambient air and compressing it into high-temperature and high-pressure air; this high-temperature and high-pressure air then enters the compression-side heat exchanger 2 as a hot fluid to release heat. At the same time, the compression heat low-temperature working fluid in the compression heat low-temperature working fluid storage tank 7 enters the compression-side heat exchanger 2 as a cold fluid driven by the compression heat low-temperature working fluid pump 8 to absorb heat. After the compressed air cools down, it continues to flow downstream. After the compression heat working fluid absorbs heat and warms up, it enters the compression heat high-temperature working fluid storage tank 9 for storage and standby.

[0058] During the period with excellent solar irradiance resources during the day, the solar thermal heat collection process can be carried out. For the trough-type heat collection and heat storage process, the compression heat high-temperature working fluid stored in the compression heat high-temperature working fluid storage tank 9 enters the trough-type heat collection field 12 under the action of the trough-type heat collection field working fluid pump 11 to absorb heat and warm up, and then is stored in the trough-type heat collection high-temperature working fluid storage tank 13. At this time, the working fluid reaches the highest allowable temperature (usually 393°C).

[0059] For the tower-type heat collection and heat storage process, the tower-type heat collection low-temperature working fluid in the tower-type heat collection low-temperature working fluid storage tank 16 flows into the tower-type heat collector 18 under the action of the tower-type heat collection working fluid pump 17 to absorb the solar energy reflected by the heliostat field 19. After the working fluid warms up to the highest allowable temperature (usually 580°C), it is stored in the storage tank 20.

[0060] The peak shaving period is from 18:00 at night to 23:00 in the morning. At this time, there are two ways for the system to generate power. One is to generate power through the Rankine cycle device 15. That is, the working fluid stored in the trough solar thermal high-temperature working fluid storage tank 13 during the day flows into the Rankine cycle device 15 under the drive of the trough solar thermal high-temperature working fluid pump 14 to provide heat source for it and generate power. After releasing heat and cooling down, the working fluid flows into the compressed heat high-temperature working fluid storage tank 9;

[0061] The other is to generate power through air expansion. That is, the high-pressure air stored in the gas storage device 3 during the valley filling period first flows into the expansion side preheater 4 as a cold fluid to absorb heat. At the same time, the working fluid stored in the compressed heat high-temperature working fluid storage tank 9 after providing heat source for the Rankine cycle device 15 flows into the expansion side preheater 4 as a hot fluid under the drive of the compressed heat high-temperature working fluid pump 10 to release heat. Then the working fluid flows into the compressed heat low-temperature working fluid storage tank 7 to wait for the next valley filling process. And the preheated air continues to flow into the expansion side reheater 5 as a cold fluid to absorb heat. At the same time, the tower solar thermal high-temperature working fluid stored in the tower solar thermal high-temperature working fluid storage tank 20 during the day flows into the expansion side reheater 5 as a hot fluid under the drive of the tower solar thermal high-temperature working fluid pump 21 to release heat. Then the working fluid flows into the tower solar thermal low-temperature working fluid storage tank 16 to wait for the next solar thermal collection. And the reheated air flows into the expander 6 to drive it to do work and generate power. Finally, the air is discharged into the atmosphere by the expander 6.

[0062] Embodiment 2: The tower-trough combined solar thermal composite compressed air energy storage system is applied to the scenario where the compressor is driven by photovoltaic output.

[0063] When the solar irradiance resource is extremely good and the photovoltaic output is excessive, the excessive output after meeting the power supply demand at that time can be used to drive the compressor 1. When the photovoltaic output fluctuates due to factors such as cloud cover and impacts the grid security, the photovoltaic output can be all used to drive the compressor 1. The compressor 1 driven by the above two kinds of photovoltaic output starts to inhale and compress air. The subsequent process is the same as the operation during the valley filling period in Embodiment 1. The solar thermal collection process in Embodiment 2 is the same as the solar thermal collection process in Embodiment 1.

[0064] The specific technological process of power generation in the second embodiment is the same as that in the first embodiment. The difference is that the power generation timing in the second embodiment can be flexibly controlled. It can generate power during peak power periods, or during other periods, or even synchronously with the compressed energy storage and solar thermal collection processes. The process of synchronous operation of the power generation process with the compressed energy storage and solar thermal collection processes mainly occurs in scenarios where solar irradiance fluctuates rather than is excessive. Through the combined regulation and operation of the trough solar thermal field working fluid pump 11, the trough solar thermal field 12, the trough solar thermal high-temperature working fluid storage tank 13, the trough solar thermal high-temperature working fluid pump 14, and the Rankine cycle device 15, the fluctuating solar irradiance can be converted into smooth power output in the Rankine cycle device 15. Similarly, under the combined regulation of the gas storage device 3, the compressed heat high-temperature working fluid storage tank 9, the compressed heat high-temperature working fluid pump 10, the expansion side preheater 4, the tower solar thermal low-temperature working fluid storage tank 16, the tower solar thermal working fluid pump 17, the tower solar thermal collector 18, the heliostat field 19, the tower solar thermal high-temperature working fluid storage tank 20, the tower solar thermal high-temperature working fluid pump 21, the expansion side reheater 5, and the expander 6, the fluctuating photovoltaic power output when driving the compressor 1 is also converted into smooth power output to support the safe operation of the power grid.

[0065] As can be seen from the above embodiments, the present system fully combines the advantages of three major technologies: compressed air energy storage, trough solar thermal collection, and tower solar thermal collection. While realizing the basic functions of compressed air energy storage, it also has the following advantages.

[0066] First of all, the present system fully expands the energy interface of the general non-supplementary combustion compressed air energy storage technology. By introducing a trough solar thermal collection system and a tower solar thermal collection system on the compression side and the expansion side respectively, it greatly enhances the further consumption of renewable energy by the compressed air energy storage technology.

[0067] Secondly, starting from the actual needs of saving work on the compression side and doing more work on the expansion side, the present system makes full use of the allowable temperature ranges of the two currently mainstream heat storage and heat exchange working fluids, namely, heat transfer oil and molten salt, thus getting rid of the mutual restriction between the compression heat and the expansion heat in the general non-supplementary combustion compressed air energy storage system.

[0068] In addition, the present system greatly improves the quality of the compression heat and the expansion heat through solar thermal collection technology, enabling the compression heat temperature to be increased to a level capable of driving Rankine cycle power generation, thus greatly improving the economy of the system.

[0069] Finally, the operation of each device in the present system fully considers the peak-valley electricity price and the volatility of solar energy, making the system more economical when used for peak shaving and valley filling, and capable of successfully smoothing its fluctuations when used to consume solar energy. Finally, the three major technologies integrated in the present invention - non-supplementary combustion compressed air energy storage, trough solar thermal collection, and tower solar thermal collection - have all been successfully commercialized, and this foundation can ensure the smooth implementation of the present system.

[0070] It should be noted that for the first branch and the second branch mentioned in the present application document, the first and the second are only used to distinguish different positions and there is no order of precedence.

[0071] In addition, it should also be noted that the orientation or positional relationship indicated by "in and out" and the like in the present application is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplifying the description and understanding, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0072] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. Any combination of all the embodiments provided by the present invention falls within the protection scope of this invention and will not be elaborated here.

[0073] The above has introduced in detail the tower-tank combined solar-thermal composite compressed air energy storage system provided by the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A tower-tank combined solar-thermal composite compressed air energy storage system, characterized in that, it includes: An air compression branch, which is successively connected in series by a compressor (1), a compression-side heat exchanger (2), and a gas storage device (3); An air expansion branch, which is successively connected in series by the gas storage device (3), an expansion-side preheater (4), an expansion-side reheater (5), and an expander (6); A compression heat cycle, which is connected in series from head to tail by a compression heat low-temperature working fluid storage tank (7), the compression-side heat exchanger (2), a compression heat high-temperature working fluid storage tank (9), and the expansion-side preheater (4); A trough solar thermal power generation cycle, which is connected in series from head to tail by the compression heat high-temperature working fluid storage tank (9), a trough solar thermal field (12), a trough solar thermal high-temperature working fluid storage tank (13), and a Rankine cycle device (15); A tower solar thermal cycle, which is connected in series from head to tail by a tower solar thermal low-temperature working fluid storage tank (16), a tower solar thermal collector (18), a tower solar thermal high-temperature working fluid storage tank (20), and the expansion-side reheater (5).

2. The tower-tank combined solar-thermal composite compressed air energy storage system according to claim 1, characterized in that, A compression heat low-temperature working fluid pump (8) is provided between the compression heat low-temperature working fluid storage tank (7) and the compression-side heat exchanger (2), and a compression heat high-temperature working fluid pump (10) is provided between the compression heat high-temperature working fluid storage tank (9) and the expansion-side preheater (4).

3. The tower-tank combined solar-thermal composite compressed air energy storage system according to claim 1, characterized in that, A trough solar thermal field working fluid pump (11) is provided between the compression heat high-temperature working fluid storage tank (9) and the trough solar thermal field (12), and a trough solar thermal high-temperature working fluid pump (14) is provided between the trough solar thermal high-temperature working fluid storage tank (13) and the Rankine cycle device (15).

4. The tower-tank combined solar-thermal composite compressed air energy storage system according to claim 1, characterized in that, A tower solar thermal working fluid pump (17) is provided between the tower solar thermal low-temperature working fluid storage tank (16) and the tower solar thermal collector (18), and a tower solar thermal high-temperature working fluid pump (21) is provided between the tower solar thermal high-temperature working fluid storage tank (20) and the expansion-side reheater (5).

5. The tower-tank combined solar-thermal composite compressed air energy storage system according to claim 1, characterized in that, Heliostat fields (19) for reflecting solar energy are symmetrically provided on both sides of the tower solar thermal collector (18).

6. The tower-tank combined solar-thermal composite compressed air energy storage system according to any one of claims 1 to 5, characterized in that, The compressor (1) is connected to a motor, and the expander (6) is connected to a generator.

7. The tower-tank combined solar-thermal composite compressed air energy storage system according to any one of claims 1 to 5, characterized in that, The working fluids of the compression heat cycle and the trough solar thermal power generation cycle are both heat-conducting oils, and the working fluid of the tower solar thermal cycle is molten salt.

8. The tower-tank combined solar-thermal composite compressed air energy storage system according to any one of claims 1 to 5, characterized in that, The compressor (1) and the compression-side heat exchanger (2) are connected in series in sequence to form a first branch, and multiple said first branches are all connected to the gas storage device (3) to form the air compression branch; The expansion-side preheater (4), the expansion-side reheater (5), and the expander (6) are connected in series in sequence to form a second branch, and multiple said second branches are all connected to the gas storage device (3) to form the air expansion branch.

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