Compressed air energy storage device and method coupling solar energy and thermochemical energy

Abstract

The present application relates to a compressed air energy storage device and method that couples solar energy with thermochemical energy. The device includes a thermochemical energy storage module, a thermoelectric power generation and oxygen production module, and a compressed air energy storage module. The compressed air energy storage module includes an energy release submodule, which includes a first working element and a first power generation element. The device absorbs solar heat through the thermochemical energy storage module. High-valent metal oxides absorb heat and undergo a reduction reaction in a solar calciner, generating high-temperature oxygen that enters the thermoelectric power generation and oxygen production module to generate electricity and prepare pure oxygen. The compressed air energy storage module compresses the input air, and the high-temperature, high-pressure gas after heating enters the thermochemical energy storage module to undergo an oxidation reaction with the high-temperature, low-valent metal oxides, releasing a large amount of heat, increasing the work capacity of the first working element, fully utilizing renewable energy, achieving energy storage and efficient cascade utilization, providing a stable power supply, and improving energy utilization.

Description

Technical Field

[0001] The present application relates to the field of new energy storage technology, and in particular to a compressed air energy storage device and method that couples solar energy with thermochemical energy. Background Art

[0002] With the advancement of science and technology, energy storage technology has also entered a period of rapid development. The scale of energy storage applications continues to expand, and various energy storage technologies are rapidly advancing. Compressed air energy storage technology has the advantages of large energy storage capacity, long energy storage cycle, high system efficiency, and long operating life. It is considered one of the most promising large-scale energy storage technologies.

[0003] Existing compressed air energy storage systems have disadvantages such as dependence on fossil energy, low system efficiency, and environmental pollution, which limit their application. However, the operation of compressed air energy storage systems involves the output of multiple energy forms such as cold, heat, and electricity, and can better adapt to and be compatible with different environments. Therefore, compressed air energy storage systems can be coupled and integrated with multiple energy systems to improve their system stability and power generation efficiency, increase the grid connection rate of renewable energy, and provide an effective solution for the utilization of renewable energy.

[0004] Existing compressed air energy storage systems couple compressed air energy storage with solar energy. This system utilizes solar energy, including photovoltaic power generation and solar thermal energy. Intermittent photovoltaic power generation can be peak-shaving using compressed air energy storage, while solar thermal energy can elevate the energy release temperature of the compressed air energy storage system, thereby increasing the system's power generation capacity and enabling cogeneration, thereby improving energy utilization. However, the most common heat storage technology for existing compressed air energy storage systems is still sensible heat storage, primarily using thermal oil and molten salt as energy sources. This suffers from disadvantages such as low temperatures and high heat losses. Summary of the Invention

[0005] The embodiments of the present application provide a compressed air energy storage device and method that couples solar energy and thermochemical energy, which are used to solve the technical problems of low temperature and large heat loss in existing compressed air energy storage systems.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] On the one hand, a compressed air energy storage device coupling solar energy and thermochemical energy is provided, comprising a thermochemical energy storage module, a temperature difference power generation and oxygen production module connected to the thermochemical energy storage module, and a compressed air energy storage module, wherein the compressed air energy storage module comprises an energy release submodule, and the energy release submodule comprises a first work element and a first power generation element;

[0008] The thermochemical energy storage module is used to provide low-valent metal oxides to the compressed air energy storage module and high-temperature oxygen to the thermoelectric power generation and oxygen production module;

[0009] The thermoelectric power generation and oxygen production module is used to generate electricity using the high-temperature oxygen as a heat source to obtain electrical energy and low-temperature oxygen; it is also used to filter and compress the low-temperature oxygen to obtain pure high-pressure oxygen;

[0010] The compressed air energy storage module is used to compress and heat the input air to obtain high-temperature and high-pressure gas;

[0011] Among them, the thermochemical energy storage module is also used to carry out an oxidation reaction between the high-temperature and high-pressure gas and the low-valent metal oxide to obtain work heat and a second high-valent metal oxide to provide work to the first working element; the work of the first working element drives the first power generation element to generate electricity.

[0012] Preferably, the thermochemical energy storage module includes a mirror field, a calcination reactor, a first storage element, a first heating element, and a second storage element. The calcination reactor is connected to the thermoelectric power generation and oxygen production module and the first storage element respectively. The output end of the first storage element is connected to the first heating element, the first heating element is connected to the second storage element, the second storage element is also connected to the calcination reactor, and the first heating element is also connected to the first working element and the second heat exchange element of the compressed air energy storage module.

[0013] The mirror field is used to provide solar heat to the calcination reactor;

[0014] The calcination reactor is used to perform a reduction reaction on the first high-valent metal oxide provided by the second storage element according to the solar thermal energy to obtain high-temperature oxygen and low-valent metal oxide;

[0015] The first storage element is configured to store the subvalent metal oxide and transfer the subvalent metal oxide to the first heating element;

[0016] The first heating element is used to perform an oxidation reaction between the low-valent metal oxide and the high-temperature and high-pressure gas to generate heat and a second high-valent metal oxide provided to the first working element for performing work;

[0017] The second storage element is used to store the second high-valent metal oxide.

[0018] Preferably, the thermoelectric power generation and oxygen production module comprises a thermoelectric submodule connected to the thermochemical energy storage module, an oxygen production element connected to the thermoelectric submodule, and an oxygen storage element connected to the oxygen production element;

[0019] The thermoelectric generator module is used to generate electricity using the high-temperature oxygen as a heat source to obtain electrical energy and low-temperature oxygen;

[0020] The oxygen production element is used to filter and compress the low-temperature oxygen to obtain pure high-pressure oxygen;

[0021] The oxygen storage element is used to store the pure high-pressure oxygen.

[0022] Preferably, the thermoelectric submodule includes a heat chamber and a second power generation element installed above the heat chamber, the second power generation element is used to generate electricity according to the heat of the high-temperature oxygen absorbed by the heat chamber, and the heat chamber outputs low-temperature oxygen to the oxygen production element.

[0023] Preferably, the compressed air energy storage module further comprises a compressed air submodule and a heat storage submodule connected to the energy release submodule;

[0024] The compressed air submodule is used to compress the input air to obtain high-temperature and high-pressure air; and is also used to perform heat exchange between the high-temperature and high-pressure air and the low-temperature working fluid provided by the heat storage submodule to obtain low-temperature and high-pressure gas;

[0025] The heat storage submodule is used to provide high-temperature working fluid to the energy release submodule;

[0026] The energy release submodule is used to perform heat exchange between the high-temperature working fluid and the low-temperature high-pressure gas to obtain high-temperature high-pressure gas.

[0027] Preferably, the compressed air submodule includes a power supply element, a first compression element, a first heat exchange element, a second compression element, a first cut-off element and an air storage element. The power supply element is connected to the first power grid, and the power supply element is also connected to the input end of the first compression element, the output end of the first compression element is connected to the input end of the first heat exchange element, the output end of the first heat exchange element is connected to the second compression element, the second compression element is connected to the first cut-off element, and the first cut-off element is connected to the air storage element; the first compression element is also connected to the second compression element.

[0028] Preferably, the energy release submodule further includes a second heat exchange element and a second cutoff element, the second cutoff element is connected between the second heat exchange element and the gas storage element, and the output end of the second heat exchange element is connected to the first heating element of the thermochemical energy storage module.

[0029] Preferably, the heat storage submodule includes a cold storage element, a first driving element, a heat storage element and a second driving element, the cold storage element is connected to the second heat exchange element, the first driving element is connected between the cold storage element and the first heat exchange element, the heat storage element is connected to the output end of the first heat exchange element, and the second driving element is connected between the first heat exchange element and the second heat exchange element.

[0030] Preferably, the energy-releasing submodule further includes a second heating element and a second working element, the output end of the first storage element and the output end of the first working element are both connected to the input end of the second heating element, the output end of the second heating element is respectively connected to the second storage element and the second working element, the second working element is connected between the first power generation element and the first working element; the first power generation element is also connected to a second power grid.

[0031] In another aspect, a compressed air energy storage method for coupling solar energy and thermochemical energy is provided, which is applied to the compressed air energy storage device for coupling solar energy and thermochemical energy described above. The compressed air energy storage method comprises the following steps:

[0032] Performing a reduction reaction on the first high-valent metal oxide provided by the second storage element by using solar thermal energy to obtain high-temperature oxygen and low-valent metal oxide;

[0033] The high-temperature oxygen is used as a heat source to generate electricity through a thermoelectric module to obtain electrical energy and low-temperature oxygen; the low-temperature oxygen is filtered and compressed to obtain pure high-pressure oxygen;

[0034] The input air is compressed to obtain high-temperature and high-pressure air, and the low-temperature working fluid provided by the heat storage submodule is heat-exchanged with the high-temperature and high-pressure air to obtain low-temperature and high-pressure gas; the high-temperature working fluid provided by the heat storage submodule is heat-exchanged with the low-temperature and high-pressure gas to obtain high-temperature and high-pressure gas;

[0035] performing an oxidation reaction between the high-temperature and high-pressure gas and the low-valent metal oxide to obtain work heat and a second high-valent metal oxide;

[0036] The first working element and / or the second working element is controlled to work according to the working heat to drive the first power generation element to generate electricity, thereby supplying power to the second power grid.

[0037] The compressed air energy storage device and method for coupling solar energy with thermochemical energy include a thermochemical energy storage module, a thermoelectric power generation and oxygen production module connected to the thermochemical energy storage module, and a compressed air energy storage module. The compressed air energy storage module includes an energy release submodule, which includes a first working element and a first power generation element. The thermochemical energy storage module is used to provide low-valent metal oxides to the compressed air energy storage module and high-temperature oxygen to the thermoelectric power generation and oxygen production module. The thermoelectric power generation and oxygen production module is used to generate electricity using high-temperature oxygen as a heat source to obtain electrical energy and low-temperature oxygen. It is also used to filter and compress the low-temperature oxygen to obtain pure high-pressure oxygen. The compressed air energy storage module is used to compress and heat the input air to obtain high-temperature and high-pressure gas. The thermochemical energy storage module is also used to oxidize the high-temperature and high-pressure gas with the low-valent metal oxide to obtain working heat and a second high-valent metal oxide for providing work to the first working element. The work of the first working element drives the first power generation element to generate electricity. From the above technical solutions, it can be seen that the present application has the following advantages: the compressed air energy storage device coupled with solar energy and thermochemical energy absorbs solar heat through the thermochemical energy storage module, and the high-valent metal oxide absorbs heat in the solar calciner to undergo a reduction reaction, generating high-temperature oxygen that enters the thermoelectric power generation and oxygen production module to generate electricity and prepare pure oxygen, and the solar energy is converted into the chemical energy of high-temperature low-valent metal oxides and stored; the input air is compressed and heated by the compressed air energy storage module to initially increase the air temperature, and then enters the thermochemical energy storage module to undergo an oxidation reaction with the high-temperature low-valent metal oxide, releasing a large amount of heat, further increasing the intake temperature of the first working element, thereby increasing the work done by the first working element, and effectively improving the energy storage efficiency and energy utilization. The compressed air energy storage device coupled with solar energy and thermochemical energy makes full use of renewable energy, realizes energy storage and efficient cascade utilization, provides a stable power supply, improves energy utilization, and solves the technical problems of low temperature and large heat loss in existing compressed air energy storage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] Figure 1 This is a schematic diagram of the framework of the compressed air energy storage device coupling solar energy and thermochemical energy according to an embodiment of the present application;

[0040] Figure 2This is a schematic diagram of a compressed air energy storage device coupled with solar energy and thermochemical energy according to another embodiment of the present application;

[0041] Figure 3 This is a flow chart of the steps of the compressed air energy storage method coupling solar energy and thermochemical energy as described in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the embodiments of the present application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0045] Thermochemical energy storage has the advantages of high temperature and high energy density. The content of thermochemical energy storage includes reaction systems such as carbonates, hydroxides, and metal oxides. Among them, the metal oxide reaction system can react with air in an open environment, and has the advantages of high reaction temperature and stability, low cost, etc.

[0046] The embodiments of the present application provide a compressed air energy storage device and method that couples solar energy and thermochemical energy, which solves the technical problems of low temperature and large heat loss in existing compressed air energy storage systems.

[0047] Example 1:

[0048] Figure 1This is a schematic diagram of the framework of the compressed air energy storage device that couples solar energy and thermochemical energy as described in an embodiment of the present application.

[0049] like Figure 1 As shown, an embodiment of the present application provides a compressed air energy storage device that couples solar energy and thermochemical energy, including a thermochemical energy storage module and a temperature difference power generation and oxygen production module and a compressed air energy storage module connected to the thermochemical energy storage module. The compressed air energy storage module includes an energy release submodule, and the energy release submodule includes a first working element 22 and a first power generation element 23.

[0050] It should be noted that the first working element 22 can be an expander, and the first power generation element 23 can be a generator. The first working element 22 is connected to the first power generation element 23.

[0051] In an embodiment of the present application, the thermochemical energy storage module is used to provide low-valent metal oxides to the compressed air energy storage module and high-temperature oxygen to the thermoelectric power generation and oxygen production module. The thermoelectric power generation and oxygen production module is used to generate electricity using high-temperature oxygen as a heat source to obtain electrical energy and low-temperature oxygen; it is also used to filter and compress the low-temperature oxygen to obtain pure high-pressure oxygen. The compressed air energy storage module is used to compress and heat the input air to obtain high-temperature and high-pressure gas. The thermochemical energy storage module is also used to oxidize the high-temperature and high-pressure gas with the low-valent metal oxide to obtain work heat and a second high-valent metal oxide to provide work to the first working element 22; the work of the first working element 22 drives the first power generation element 23 to generate electricity.

[0052] It should be noted that the low-valent metal oxide may be CoO, MnO, FeO, and CuO, and the second high-valent metal oxide may be Co3O4, Mn3O4, Fe2O3, and Cu2O, etc. In this embodiment, the compressed air energy storage device coupled with solar energy and thermochemical energy converts the surplus electrical energy of the first power grid into pressure release energy storage through the compressed air energy storage module. The thermochemical energy storage module converts solar energy into chemical energy and stores it. It can also convert the stored pressure release energy and chemical energy into stable electrical energy output, thereby increasing the intake temperature of the first working element 22 during the energy release process and increasing the work done by the first working element 22.

[0053] The present application provides a compressed air energy storage device that couples solar energy and thermochemical energy, including a thermochemical energy storage module, a thermoelectric power generation and oxygen production module connected to the thermochemical energy storage module, and a compressed air energy storage module. The compressed air energy storage module includes an energy release submodule, which includes a first working element and a first power generation element. The thermochemical energy storage module is used to provide low-valent metal oxides to the compressed air energy storage module and high-temperature oxygen to the thermoelectric power generation and oxygen production module. The thermoelectric power generation and oxygen production module is used to generate electricity using high-temperature oxygen as a heat source to obtain electrical energy and low-temperature oxygen. It is also used to filter and compress the low-temperature oxygen to obtain pure high-pressure oxygen. The compressed air energy storage module is used to compress and heat the input air to obtain high-temperature and high-pressure gas. The thermochemical energy storage module is also used to oxidize the high-temperature and high-pressure gas with the low-valent metal oxide to obtain working heat and a second high-valent metal oxide for providing work to the first working element. The work of the first working element drives the first power generation element to generate electricity. This compressed air energy storage device, which couples solar energy with thermochemical energy, absorbs solar heat through a thermochemical energy storage module. High-valent metal oxides absorb heat in a solar calciner and undergo a reduction reaction, generating high-temperature oxygen that enters the thermoelectric power generation and oxygen production module to generate electricity and prepare pure oxygen. Solar energy is converted into chemical energy of high-temperature low-valent metal oxides and stored. The compressed air energy storage module compresses and heats the input air to initially raise the air temperature. The high-temperature and high-pressure gas then enters the thermochemical energy storage module to undergo an oxidation reaction with the high-temperature low-valent metal oxides, releasing a large amount of heat, further raising the intake temperature of the first working element. This increases the work done by the first working element, effectively improving energy storage efficiency and energy utilization. This compressed air energy storage device, which couples solar energy with thermochemical energy, fully utilizes renewable energy, achieves energy storage and efficient cascade utilization, provides a stable power supply, improves energy utilization, and solves the technical problems of low temperature and large heat loss in existing compressed air energy storage systems.

[0054] like Figure 1 As shown, in one embodiment of the present application, the thermochemical energy storage module includes a mirror field 1, a calcination reactor 2, a first storage element 7, a first heating element 8 and a second storage element 9. The calcination reactor 2 is connected to the temperature difference power generation and oxygen production module and the first storage element 7 respectively. The output end of the first storage element 7 is connected to the first heating element 8, the first heating element 8 is connected to the second storage element 9, and the second storage element 9 is also connected to the calcination reactor 2. The first heating element 8 is also connected to the first working element 22 and the second heat exchange element 17 of the compressed air energy storage module.

[0055] It should be noted that the mirror field 1 can be selected as a photothermal system mirror field device, the first heating element 8 can be selected as a heater, the first storage element 7 can be selected as a storage tank, and the second storage element 9 can be selected as a storage tank.

[0056] In this embodiment of the present application, the mirror field 1 is used to provide solar thermal energy to the calcination reactor 2. The calcination reactor 2 is used to reduce the first high-valent metal oxide provided by the second storage element 9 using the solar thermal energy to produce high-temperature oxygen and low-valent metal oxide. The first storage element 7 is used to store the low-valent metal oxide and transfer it to the first heating element 8. The first heating element 8 is used to oxidize the low-valent metal oxide with high-temperature, high-pressure gas to produce heat for work and a second high-valent metal oxide provided to the first working element 22. The second storage element 9 is used to store the second high-valent metal oxide.

[0057] It should be noted that the first high-valent metal oxide can be Co3O4, Mn3O4, Fe2O3, Cu2O, etc. In this embodiment, the calcination reactor 2 can be placed in a tower-type solar thermal collector to collect solar heat reflected from the mirror field 1; the first high-valent metal oxide is stored in the second storage element 9 and transported into the calcination reactor 2 for high-temperature endothermic decomposition and reduction reaction. The generated low-valent metal oxide is stored in the first storage element 7, and the generated high-temperature oxygen enters the thermoelectric power generation and oxygen production module; the low-valent metal oxide enters the first heating element 8 and undergoes a strong oxidation reaction with the high-temperature, high-pressure gas compressed in the compressed air energy storage module, releasing a large amount of work heat to heat the air entering the first working element 22, driving the first working element 22 to perform work, generating a second high-valent metal oxide that is stored in the second storage element 9.

[0058] like Figure 1 As shown, in one embodiment of the present application, the thermoelectric power generation and oxygen production module includes a thermoelectric power generation submodule connected to the thermochemical energy storage module, an oxygen production element 5 connected to the thermoelectric power generation submodule, and an oxygen storage element 6 connected to the oxygen production element 5. The thermoelectric power generation submodule includes a heat chamber 3 and a second power generation element 4 mounted above the heat chamber 3. The second power generation element 4 is used to generate electricity by absorbing heat from the high-temperature oxygen in the heat chamber 3. The heat chamber 3 outputs low-temperature oxygen to the oxygen production element 5.

[0059] It should be noted that the oxygen-generating element 5 can be an oxygen-generating device, the second power-generating element 4 can be a Stirling generator, the oxygen storage element 6 can be a storage tank, and the heat chamber 3 can be a heat absorber. The thermoelectric power generation submodule is used to generate electricity using high-temperature oxygen as a heat source, producing both electrical energy and low-temperature oxygen. The oxygen-generating element 5 is used to filter and compress the low-temperature oxygen to produce pure high-pressure oxygen; the oxygen storage element 6 is used to store the pure high-pressure oxygen. In this embodiment, the thermoelectric power generation and oxygen-generating module operates as follows: the high-temperature oxygen generated by the calcination reactor 2 enters the heat chamber 3, serving as the heat source for the second power-generating element 4, driving it to generate electricity and provide electricity to the user; the low-temperature oxygen output from the heat chamber 3 enters the oxygen-generating element 5, undergoes a series of filtration and compression steps, and becomes pure high-pressure oxygen, which is stored in the oxygen storage element 6.

[0060] In the embodiment of the present application, the heat chamber 3 is used to convert thermal energy into mechanical energy, such as transferring heat from high-temperature oxygen to the working fluid of the heat chamber 3. The working fluid absorbs thermal energy during the thermal expansion process, pushing the piston or other moving parts of the heat chamber 3 to move, converting thermal energy into mechanical energy, and finally driving the second power generation element 4 to generate electrical energy.

[0061] It should be noted that the heat chamber consists of a heat exchanger and a piston, which can be replaced by other moving parts. The heat exchanger is used to transfer the thermal energy of the high-temperature oxygen to the working fluid (such as hydrogen, helium, nitrogen, etc.). The heat exchanger can be tubular or plate-type, and its purpose is to transfer thermal energy to the working fluid as efficiently as possible. The working fluid expands and compresses within the heat chamber, driving the piston or other moving parts to convert thermal energy into mechanical energy.

[0062] like Figure 1 As shown, in one embodiment of the present application, the compressed air energy storage module further includes a compressed air submodule and a heat storage submodule connected to the energy release submodule;

[0063] The compressed air submodule is used to compress the input air to obtain high-temperature and high-pressure air; it is also used to exchange heat between the low-temperature working fluid provided by the heat storage submodule and the high-temperature and high-pressure air to obtain low-temperature and high-pressure gas;

[0064] The heat storage submodule is used to provide high-temperature working fluid to the energy release submodule;

[0065] The energy release submodule is used to perform heat exchange between the high-temperature working fluid and the low-temperature and high-pressure gas to obtain the high-temperature and high-pressure gas.

[0066] It should be noted that the low-temperature working fluid can be water or thermal oil. The high-temperature working fluid can also be water or thermal oil. In adiabatic compressed air energy storage, the first heat exchange element 12 is used to store the compression heat generated by the air compressor during the energy release process. The cooling heat of the high-temperature compressed air is transferred to the low-temperature working fluid, which is then stored in the heat storage element 15.

[0067] like Figure 1 As shown, in the embodiment of the present application, the compressed air submodule includes a power supply element 10, a first compression element 11, a first heat exchange element 12, a second compression element 13, a first cut-off element 14, and an air storage element 20. The power supply element 10 is connected to the first power grid and is also connected to the input end of the first compression element 11. The output end of the first compression element 11 is connected to the input end of the first heat exchange element 12. The output end of the first heat exchange element 12 is connected to the second compression element 13. The second compression element 13 is connected to the first cut-off element 14. The first cut-off element 14 is connected to the air storage element 20. The first compression element 11 is also connected to the second compression element 13. The energy release submodule also includes a second heat exchange element 17 and a second cut-off element 21. The second cut-off element 21 is connected between the second heat exchange element 17 and the air storage element 20. The output end of the second heat exchange element 17 is connected to the first heating element 8 of the thermochemical energy storage module. The heat storage submodule includes a cold storage element 18, a first drive element 19, a heat storage element 15 and a second drive element 16. The cold storage element 18 is connected to the second heat exchange element 17. The first drive element 19 is connected between the cold storage element 18 and the first heat exchange element 12. The heat storage element 15 is connected to the output end of the first heat exchange element 12. The second drive element 16 is connected between the first heat exchange element 12 and the second heat exchange element 17.

[0068] It should be noted that the power supply element 10 can be an electric motor, the first power grid can be a power distribution network, the first heat exchange element 12 and the second heat exchange element 17 can both be heat exchangers, the first compression element 11 and the second compression element 13 can both be compressors, the first shut-off element 14 and the second shut-off element 21 can both be shut-off valves, the cold storage element 18, the gas storage element 20, and the heat storage element 15 can each be a storage tank, and the first drive element 19 and the second drive element 16 can each be a hydraulic pump. In this embodiment, the cold storage element 18 is used to store low-temperature working fluid, the heat storage element 15 is used to store high-temperature working fluid, and the gas storage element 20 is used to store low-temperature, high-pressure gas. Low-temperature, low-pressure air is input to the input end of the first compression element 11.

[0069] In the embodiment of the present application, the working principle of the compressed air energy storage module includes:

[0070] During the energy storage phase, the first cut-off element 14 is started or opened, and the surplus power or renewable energy of the first power grid drives the power supply element 10 to work, which drives the first compression element 11 and the second compression element 13 to work. The low-temperature, low-pressure air is compressed into high-temperature, high-pressure air by the first compression element 11. The low-temperature working fluid in the cold storage element 18 enters the first heat exchange element 12 through the first driving element 19 and exchanges heat with the high-temperature, high-pressure air. The cooled low-temperature, high-pressure gas enters the second compression element 13 to continue to increase its pressure, and is compressed and stored in the gas storage element 20.

[0071] During the energy release stage, the second cut-off element 21 is started or opened, the gas storage element 20 releases low-temperature and high-pressure gas, and the high-temperature working fluid in the heat storage element 15 enters the second heat exchange element 17 through the second driving element 16. The high-temperature working fluid exchanges heat with the low-temperature and high-pressure gas in the second heat exchange element 17 to form high-temperature and high-pressure gas and transports the high-temperature and high-pressure gas into the first heating element 8. The high-temperature and high-pressure gas undergoes an oxidation reaction with the metal oxide, further increasing the intake temperature of the first working element 22, and enters the first working element 22 to expand and do work, and the expansion work is output to the outside to drive the first power generation element 23 to output electrical energy to the outside.

[0072] Figure 2 This is a schematic diagram of the framework of a compressed air energy storage device that couples solar energy and thermochemical energy according to another embodiment of the present application.

[0073] like Figure 2 As shown, in one embodiment of the present application, the energy release submodule also includes a second heating element 24 and a second working element 25, the output end of the first storage element 7 and the output end of the first working element 22 are both connected to the input end of the second heating element 24, the output end of the second heating element 24 is respectively connected to the second storage element 9 and the second working element 25, the second working element 25 is connected between the first power generation element 23 and the first working element 22; the first power generation element 23 is also connected to the second power grid.

[0074] It should be noted that the second heating element 24 can be a heater, and the second working element 25 can be an expander. After the high-temperature, high-pressure gas expands and works in the first working element 22, its temperature drops and it is transported to the second heating element 24, where it undergoes an oxidation reaction with the high-valent metal oxide in the first storage element 7, producing low-valent metal oxides that are stored in the second storage element 9. The oxidation reaction also releases a large amount of heat, raising the inlet temperature of the expander. The gas then enters the second working element 25, outputting expansion work to drive the first power generation element 23, which then outputs electrical energy to the second power grid.

[0075] Example 2:

[0076] Figure 3This is a flow chart of the steps of the compressed air energy storage method coupling solar energy and thermochemical energy as described in an embodiment of the present application.

[0077] like Figure 3 As shown, an embodiment of the present application provides a compressed air energy storage method for coupling solar energy and thermochemical energy, which is applied to the above-mentioned compressed air energy storage device for coupling solar energy and thermochemical energy. The compressed air energy storage method includes the following steps:

[0078] S1. A first high-valent metal oxide provided by a second storage element is reduced by solar thermal to obtain high-temperature oxygen and a low-valent metal oxide;

[0079] S2. The thermoelectric module generates electricity using high-temperature oxygen as a heat source to generate electricity and low-temperature oxygen; the low-temperature oxygen is filtered and compressed to produce pure high-pressure oxygen;

[0080] S3. The input air is compressed to obtain high-temperature and high-pressure air, and the low-temperature working fluid provided by the heat storage submodule is heat exchanged with the high-temperature and high-pressure air to obtain low-temperature and high-pressure gas; the high-temperature working fluid provided by the heat storage submodule is heat exchanged with the low-temperature and high-pressure gas to obtain high-temperature and high-pressure gas;

[0081] S4. The high-temperature and high-pressure gas is oxidized with a low-valent metal oxide to obtain work heat and a second high-valent metal oxide;

[0082] S5. Control the first working element and / or the second working element to work according to the work heat to drive the first power generation element to generate electricity, thereby supplying power to the second power grid.

[0083] It should be noted that the details of the compressed air energy storage device coupled with solar energy and thermochemical energy have been described in Example 1 and will not be repeated in this embodiment. In this embodiment, the compressed air energy storage method coupled with solar energy and thermochemical energy is as follows: a thermochemical energy storage module absorbs solar heat, and a high-valent metal oxide undergoes a reduction reaction in a calcination reactor to generate high-temperature oxygen, which enters the thermoelectric submodule of the thermoelectric power generation and oxygen production module to generate electricity. The oxygen then enters the oxygen production element to produce pure oxygen. The chemical energy converted from solar energy to high-temperature low-valent metal oxide is stored in the first storage element. During the electrical energy release phase, the second heat exchange element uses the compression heat stored in the gas storage element to preheat the low-temperature, high-pressure air, initially raising the air temperature. The air then enters the first heating element to undergo an oxidation reaction with the high-temperature low-valent metal oxide, releasing a large amount of heat, further raising the intake temperature of the first working element. This increases the work done by the first working element, effectively improving energy storage efficiency and energy utilization. This compressed air energy storage method that couples solar energy and thermochemical energy makes full use of renewable energy, realizes energy storage and efficient cascade utilization, provides a stable power supply, improves energy utilization, and provides ideas for the integrated complementarity of multiple energy and energy storage technologies.

[0084] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0085] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0086] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0087] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0088] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0089] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A compressed air energy storage device coupled with solar energy and thermochemical energy, characterized in that: It includes a thermochemical energy storage module, a temperature difference power generation and oxygen production module and a compressed air energy storage module connected to the thermochemical energy storage module, the compressed air energy storage module includes an energy release submodule, and the energy release submodule includes a first working element and a first power generation element; The thermochemical energy storage module is used to provide low-valent metal oxides to the compressed air energy storage module and high-temperature oxygen to the thermoelectric power generation and oxygen production module; The thermoelectric power generation and oxygen production module is used to generate electricity using the high-temperature oxygen as a heat source to obtain electrical energy and low-temperature oxygen; it is also used to filter and compress the low-temperature oxygen to obtain pure high-pressure oxygen; The compressed air energy storage module is used to compress and heat the input air to obtain high-temperature and high-pressure gas; The thermochemical energy storage module is further configured to perform an oxidation reaction between the high-temperature and high-pressure gas and the low-valent metal oxide to generate heat for providing work to the first working element and a second high-valent metal oxide; the first working element performs work to drive the first power generation element to generate electricity; The thermochemical energy storage module includes a mirror field, a calcination reactor, a first storage element, a first heating element, and a second storage element. The calcination reactor is connected to the thermoelectric power generation and oxygen production module and the first storage element respectively. The output end of the first storage element is connected to the first heating element, the first heating element is connected to the second storage element, and the second storage element is also connected to the calcination reactor. The first heating element is also connected to the first working element and the second heat exchange element of the compressed air energy storage module. The mirror field is used to provide solar heat to the calcination reactor; The calcination reactor is used to perform a reduction reaction on the first high-valent metal oxide provided by the second storage element according to the solar thermal energy to obtain high-temperature oxygen and low-valent metal oxide; The first storage element is configured to store the subvalent metal oxide and transfer the subvalent metal oxide to the first heating element; The first heating element is used to perform an oxidation reaction between the low-valent metal oxide and the high-temperature and high-pressure gas to generate heat and a second high-valent metal oxide provided to the first working element for performing work; The second storage element is used to store the second high-valent metal oxide.

2. The compressed air energy storage device coupled with solar energy and thermochemical energy according to claim 1, characterized in that: The thermoelectric power generation and oxygen production module includes a thermoelectric submodule connected to the thermochemical energy storage module, an oxygen production element connected to the thermoelectric submodule, and an oxygen storage element connected to the oxygen production element; The thermoelectric generator module is used to generate electricity using the high-temperature oxygen as a heat source to obtain electrical energy and low-temperature oxygen; The oxygen production element is used to filter and compress the low-temperature oxygen to obtain pure high-pressure oxygen; The oxygen storage element is used to store the pure high-pressure oxygen.

3. The compressed air energy storage device coupled with solar energy and thermochemical energy according to claim 2, characterized in that: The thermoelectric submodule includes a heat chamber and a second power generation element installed above the heat chamber. The second power generation element is used to generate electricity according to the heat of the high-temperature oxygen absorbed by the heat chamber. The heat chamber outputs low-temperature oxygen to the oxygen production element.

4. The compressed air energy storage device coupled with solar energy and thermochemical energy according to claim 1, characterized in that: The compressed air energy storage module further includes a compressed air submodule and a heat storage submodule connected to the energy release submodule; The compressed air submodule is used to compress the input air to obtain high-temperature and high-pressure air; and is also used to perform heat exchange between the high-temperature and high-pressure air and the low-temperature working fluid provided by the heat storage submodule to obtain low-temperature and high-pressure gas; The heat storage submodule is used to provide high-temperature working fluid to the energy release submodule; The energy release submodule is used to perform heat exchange between the high-temperature working fluid and the low-temperature high-pressure gas to obtain high-temperature high-pressure gas.

5. The compressed air energy storage device coupled with solar energy and thermochemical energy according to claim 4, characterized in that: The compressed air submodule includes a power supply element, a first compression element, a first heat exchange element, a second compression element, a first cut-off element and an air storage element. The power supply element is connected to the first power grid, and is also connected to the input end of the first compression element. The output end of the first compression element is connected to the input end of the first heat exchange element, the output end of the first heat exchange element is connected to the second compression element, the second compression element is connected to the first cut-off element, and the first cut-off element is connected to the air storage element; the first compression element is also connected to the second compression element.

6. The compressed air energy storage device coupled with solar energy and thermochemical energy according to claim 5, characterized in that: The energy release submodule further includes a second heat exchange element and a second cutoff element. The second cutoff element is connected between the second heat exchange element and the gas storage element. The output end of the second heat exchange element is connected to the first heating element of the thermochemical energy storage module.

7. The compressed air energy storage device coupled with solar energy and thermochemical energy according to claim 6, characterized in that: The heat storage submodule includes a cold storage element, a first driving element, a heat storage element, and a second driving element. The cold storage element is connected to the second heat exchange element, the first driving element is connected between the cold storage element and the first heat exchange element, the heat storage element is connected to the output end of the first heat exchange element, and the second driving element is connected between the first heat exchange element and the second heat exchange element.

8. The compressed air energy storage device coupled with solar energy and thermochemical energy according to claim 1, characterized in that: The energy release submodule also includes a second heating element and a second working element. The output end of the first storage element and the output end of the first working element are both connected to the input end of the second heating element. The output end of the second heating element is respectively connected to the second storage element and the second working element. The second working element is connected between the first power generation element and the first working element. The first power generation element is also connected to the second power grid.

9. A compressed air energy storage method coupling solar energy and thermochemical energy, characterized in that: Applied to the compressed air energy storage device coupled with solar energy and thermochemical energy as claimed in any one of claims 1 to 8, the compressed air energy storage method comprises the following steps: Performing a reduction reaction on the first high-valent metal oxide provided by the second storage element by using solar thermal energy to obtain high-temperature oxygen and low-valent metal oxide; The high-temperature oxygen is used as a heat source to generate electricity through a thermoelectric module to obtain electrical energy and low-temperature oxygen; the low-temperature oxygen is filtered and compressed to obtain pure high-pressure oxygen; The input air is compressed to obtain high-temperature and high-pressure air, and the low-temperature working fluid provided by the heat storage submodule is heat-exchanged with the high-temperature and high-pressure air to obtain low-temperature and high-pressure gas; the high-temperature working fluid provided by the heat storage submodule is heat-exchanged with the low-temperature and high-pressure gas to obtain high-temperature and high-pressure gas; performing an oxidation reaction between the high-temperature and high-pressure gas and the low-valent metal oxide to obtain work heat and a second high-valent metal oxide; The first working element and / or the second working element is controlled to work according to the working heat to drive the first power generation element to generate electricity, thereby supplying power to the second power grid.

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