Energy system and method for salt lake lithium extraction and combined heat and power generation

Abstract

An outlet of a multi-stage phase change heat storage device is divided into three paths, the first path is communicated with a shell side inlet of a heat exchanger through a first valve, and the second path is communicated with the shell side inlet of the heat exchanger through a fifth valve and the heat absorption side of a photovoltaic power generation device; the third path is communicated with a user side through a sixth valve, and a third valve is arranged at a shell side inlet of the heat exchanger; the output end of the photovoltaic power generation device is connected with the user side and the electrodialysis device; a shell side outlet of the heat exchanger is divided into two paths, one path is communicated with an inlet of the multi-stage phase change heat storage device, and the other path is communicated with a shell side inlet of the heat exchanger through a second valve. Meanwhile, electric energy and heat energy are stably and continuously supplied to the user side, and diversified production and life requirements of users are met.

Description

Technical Field

[0001] The invention belongs to the field of renewable energy and thermal energy utilization, and relates to an energy system and method for lithium extraction from a salt lake and cogeneration of heat and power. Background Art

[0002] Lithium resources play an important role in new energy vehicles, energy storage materials and devices, and electronics. my country's lithium resources mainly exist in the brine of plateau salt lakes. However, the output of lithium extracted from salt lakes is difficult to meet market demand due to environmental and technical limitations.

[0003] Publication No. CN116608103A A carbon dioxide solar thermal power generation system and method equipped with phase change heat storage, including a concentrating heat collection system, a heat storage and heat exchange system, a CO2 power generation system and a photovoltaic power generation system; the concentrating heat collection system includes a collector; the heat storage and heat exchange system includes: a phase change heat storage heater, a molten salt-CO2 heat exchanger and a heat transfer molten salt storage tank, the outlet of the phase change heat storage heater is connected to the heat transfer molten salt side inlet of the molten salt-CO2 heat exchanger, the heat transfer molten salt side outlet of the molten salt-CO2 heat exchanger is connected to the heat transfer molten salt storage tank inlet, the heat transfer molten salt storage tank outlet is divided into two paths, one is connected to the inlet of the phase change heat storage heater, and the other is connected to the inlet of the collector, and the outlet of the collector is connected to the inlet of the phase change heat storage heater; the CO2 power generation system is connected to the molten salt-CO2 heat exchanger, the photovoltaic power generation system is connected to the phase change heat storage heater, and phase change energy storage is used as the energy storage system of the CO2 power generation system. Since the characteristic of CO2 solar thermal power generation system is that after heat recovery, the temperature of molten salt entering the tower is very high, and the heat storage temperature difference of molten salt becomes smaller, if conventional sensible heat storage is used, the storage capacity of molten salt will be very large. However, the temperature of phase change heat storage is constant during heat release, and the energy storage density is much greater than that of sensible heat storage, so the amount of heat storage medium can be greatly reduced. In addition, this solar thermal power generation and energy storage system is equipped for photovoltaic power stations. Phase change energy storage can use electric heaters to achieve heat storage. When electric heating converts electrical energy into thermal energy, there is no need for excessively high heat transfer temperature difference, and energy transfer can be achieved. There is no need for step-by-step phase change energy storage, but it is just a combination of energy storage and power generation.

[0004] Electrodialysis is a technology that uses an external DC electric field to drive the directional migration of salt lake brine ions through ion exchange membranes to achieve lithium salt extraction. However, the current electrodialysis technology is still sensitive to water temperature changes and unstable output under low temperature conditions. In addition, the single lithium salt output still cannot meet the diverse production and living needs of the plateau region, such as electricity and heat energy. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide an energy system and method for lithium extraction from salt lakes and cogeneration of heat and power. The system and method can solve the failure problem of traditional lithium extraction processes from salt lakes under low-temperature conditions in plateaus, while stably and continuously supplying electricity and heat energy to the user end to meet the user's diverse production and living needs.

[0006] To achieve the above-mentioned purpose, the present invention discloses an energy system for lithium extraction from salt lakes and cogeneration of heat and power, comprising a multi-stage phase change heat storage device, a heat exchanger, a photovoltaic power generation device, a user end, an electrodialysis device and a brine supply device;

[0007] The outlet of the multi-stage phase-change heat storage device is divided into three routes, wherein the first route is connected to the shell-side inlet of the heat exchanger via the first valve, the second route is connected to the shell-side inlet of the heat exchanger via the fifth valve and the heat absorption side of the photovoltaic power generation device, and the third route is connected to the user end via the sixth valve, and a third valve is provided at the shell-side inlet of the heat exchanger;

[0008] The output end of the photovoltaic power generation device is connected to the user end and the electrodialysis device;

[0009] The shell side outlet of the heat exchanger is divided into two paths, one of which is connected to the inlet of the multi-stage phase change heat storage device, and the other is connected to the shell side inlet of the heat exchanger through the second valve.

[0010] The outlet of the brine supply device is connected to the inlet of the electrodialysis device through the fourth valve and the tube side of the heat exchanger, and the lithium salt product outlet of the electrodialysis device is connected to the user end.

[0011] The further improvement of the energy system of lithium extraction from salt lake and cogeneration of heat and power described in the present invention is:

[0012] Furthermore, the output end of the photovoltaic power generation device is connected to the user end and the electrodialysis device via the power storage and power distribution device.

[0013] Furthermore, the photovoltaic power generation device adopts a combination of concentration and frequency division.

[0014] Furthermore, the photovoltaic power generation device includes a concentrating reflector, a solid frequency divider and a solar cell. The sunlight reflected by the concentrating reflector is incident on the solar cell after passing through the solid frequency divider.

[0015] Furthermore, the solar cells include crystalline silicon cells, gallium arsenide thin film cells, organic solar cells, dye-sensitized photovoltaic cells, perovskite photovoltaic cells and quantum dot solar cells.

[0016] Furthermore, the multi-stage phase change heat storage device contains a variety of filling phase change materials.

[0017] Furthermore, the phase change material includes paraffin, sulfate and nitrate.

[0018] The present invention discloses an energy method for extracting lithium from a salt lake and cogenerating heat and power, comprising the following steps:

[0019] In the sunny working mode, the solar cells in the photovoltaic power generation device receive concentrated sunlight to generate electricity, and the resulting electric energy is stored at the user end and the electrodialysis device; the waste heat generated during the power generation process of the photovoltaic power generation device is taken away by the heat carrier and then divided into two paths, one part of the heat enters the heat exchanger, and the other part of the heat enters the multi-stage phase change heat storage device for storage and temperature control, and then is transported to the user end; the normal temperature brine output by the brine supply device enters the heat exchanger to absorb heat, and then enters the electrodialysis device to extract the lithium salt product required by the user end, thereby achieving the simultaneous acquisition of electric energy, heat energy and lithium salt products;

[0020] In rainy or low-temperature working mode, the electric energy stored in the energy storage and power distribution device is distributed to the user end and the electrodialysis device, and the thermal energy stored in the multi-stage phase change heat storage device is released and directly distributed to the user end and the heat exchanger to maintain the thermal energy supply. The electrodialysis device continues to extract lithium salt products under the conditions of electric and thermal energy supply, thereby stably and continuously producing electric energy, thermal energy and lithium salt products for the user end.

[0021] The further improvement of the energy method of extracting lithium from salt lake and cogeneration of heat and power described in the present invention is:

[0022] Furthermore, the photovoltaic power generation device includes a concentrating reflector, a solid frequency divider and a solar cell. The sunlight reflected by the concentrating reflector is incident on the solar cell after passing through the solid frequency divider.

[0023] Furthermore, the solar cells include crystalline silicon cells, gallium arsenide thin film cells, organic solar cells, dye-sensitized photovoltaic cells, perovskite photovoltaic cells and quantum dot solar cells.

[0024] The present invention has the following beneficial effects:

[0025] The energy system and method for lithium extraction and cogeneration of heat and power from salt lakes described in the present invention, during specific operation, effectively cools the photovoltaic power generation device to maintain high-power electrical energy output, and introduces the recovered waste heat into the electrodialysis device through a heat exchanger, thereby significantly improving the performance of electrodialysis extraction of lithium salts in an energy coupling and complementary manner, and solving the problem of failure of traditional salt lake lithium extraction processes under plateau low-temperature conditions. In addition, it should be noted that the present invention can operate uninterruptedly around the clock, and does not require expensive cost improvements to the electrodialysis ion exchange membrane materials, and can achieve stable and continuous output of electricity, heat and lithium salts under cross-season, cross-day and night and large temperature difference environmental conditions, and the output ratio of electricity, heat and lithium salts can be adjusted according to actual needs, and it is extremely practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural diagram of the present invention;

[0028] Figure 2 This is the medium flow diagram of the present invention.

[0029] Among them, 1 is the first valve, 2 is the multi-stage phase change heat storage device, 3 is the second valve, 4 is the third valve, 5 is the heat exchanger, 6 is the fourth valve, 7 is the brine supply device, 8 is the electrodialysis device, 9 is the power storage and power distribution device, 10 is the user end, 11 is the photovoltaic power generation device, 12 is the fifth valve, and 13 is the sixth valve. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0033] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0034] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0035] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0038] As is known, the electrodialysis device is a separation technology based on the principle of electrochemistry. The following is a detailed introduction to the electrodialysis device: The electrodialysis device uses the difference in mobility under the action of an electric field to separate substances with different charges. When there are substances to be separated in the solution, the charged substances will migrate to the electrode through the establishment of an electric field, while the counterions tend to the other pole, thereby achieving the separation of substances. Specifically, the electrodialysis device uses the phenomenon of directional migration of ions under an electric field and the selective permeability of ion exchange membranes to achieve the purpose of desalination. Under the action of an external DC electric field, the ions in the water migrate in a directional manner, so that most of the ions in one part of the water migrate to another part, thereby achieving the purpose of desalination. The electrodialysis device is mainly composed of the following parts: anion membrane and cation membrane: they have selective permeability to ions in water and are the desalination part of the device. Partition: The main material is polypropylene, which plays the role of supporting the anion and cation membranes and forming a concentrated and fresh water chamber with them. Electrode: It mainly forms the electric field required for the ion exchange membrane, and is composed of a water distribution head, a porous plate, and a PVC frame. Clamping device: Fix the anion and cation exchange membrane, electrode, partition, etc. to form a whole. Anti-leakage rubber sheet: between the electrode and the partition, to prevent the system from leaking at the electrode. Acid cleaning system: used to clean the device. When the electrodialysis device produces abnormal phenomena such as decreased desalination rate, decreased water production, and increased operating pressure, appropriate chemical agents should be used for chemical cleaning. Silicon controlled rectifier cabinet: the energy feed-in part of the device, which rectifies the industrial frequency AC into a DC voltage with adjustable voltage, applies it to the electrode to form a DC electric field in the membrane stack to pull the anions and cations in the solution to produce directional movement.

[0039] Embodiment 1

[0040] refer to Figure 1 The energy system for lithium extraction and cogeneration of heat and power from salt lakes of the present invention comprises a multi-stage phase change heat storage device 2, a heat exchanger 5, a photovoltaic power generation device 11, a user end 10, an electrodialysis device 8 and a brine supply device 7; the outlet of the multi-stage phase change heat storage device 2 is divided into three routes, wherein the first route is connected to the shell side inlet of the heat exchanger 5 via the first valve 1, the second route is connected to the shell side inlet of the heat exchanger 5 via the fifth valve 12 and the heat absorption side of the photovoltaic power generation device 11, and the third route is connected to the user end 10 via the sixth valve 13. A third valve 4 is provided at the shell side inlet of the heat exchanger 5; the output end of the photovoltaic power generation device 11 is connected to the user end 10 and the electrodialysis device 8; the shell side outlet of the heat exchanger 5 is divided into two paths, one of which is connected to the inlet of the multi-stage phase change heat storage device 2, and the other is connected to the shell side inlet of the heat exchanger 5 through the second valve 3; the outlet of the brine supply device 7 is connected to the inlet of the electrodialysis device 8 through the fourth valve 6 and the tube side of the heat exchanger 5, and the lithium salt product outlet of the electrodialysis device 8 is connected to the user end 10.

[0041] Embodiment 2

[0042] like Figure 1 and Figure 2 As shown, for concrete implementation, the energy system for lithium extraction and cogeneration of heat and power from salt lakes of the present invention includes a power generation and circuit control module, a heat storage and heat exchange module, and a lithium salt extraction module;

[0043] The power generation and circuit control module includes a photovoltaic power generation device 11 and a power storage and power distribution device 9;

[0044] The heat storage and heat exchange module includes a multi-stage phase change heat storage device 2 and a heat exchanger 5;

[0045] The lithium salt extraction module includes a brine supply device 7 and an electrodialysis device 8 .

[0046] The photovoltaic power generation device 11 adopts a combination of focusing and frequency division, including a focusing reflector, a solid frequency divider and a solar cell. The solar cell includes a crystalline silicon cell, a gallium arsenide thin film cell, an organic solar cell, a dye-sensitized photovoltaic cell, a perovskite photovoltaic cell and a quantum dot solar cell.

[0047] The power storage and distribution device 9 includes a storage battery, a digital controller and an automatic monitoring device. The storage battery includes an ion battery, a lead-acid battery, a nickel-cadmium battery and a nickel-metal hydride battery.

[0048] The multi-stage phase change heat storage device 2 contains a variety of filling phase change materials, including paraffin, sulfate and nitrate. The multi-stage phase change heat storage device 2 is connected to the photovoltaic power generation device 11 and the heat exchanger 5 through a pipeline, and the pipeline contains liquid and circulating heat carrier.

[0049] Specifically, the outlet of the multi-stage phase change heat storage device 2 is divided into three routes, wherein the first route is connected to the shell side inlet of the heat exchanger 5 via the first valve 1, the second route is connected to the shell side inlet of the heat exchanger 5 via the fifth valve 12 and the heat absorption side of the photovoltaic power generation device 11, and the third route is connected to the user end 10 via the sixth valve 13. A third valve 4 is provided at the shell side inlet of the heat exchanger 5.

[0050] The output end of the photovoltaic power generation device 11 is connected to the user end 10 and the electrodialysis device 8 via the power storage and power distribution device 9;

[0051] The shell side outlet of the heat exchanger 5 is divided into two paths, one of which is connected to the inlet of the multi-stage phase change heat storage device 2 , and the other is connected to the shell side inlet of the heat exchanger 5 through the second valve 3 .

[0052] The outlet of the salt water supply device 7 is connected to the inlet of the electrodialysis device 8 via the fourth valve 6 and the tube side of the heat exchanger 5 , and the lithium salt product outlet of the electrodialysis device 8 is connected to the user end 10 .

[0053] The heat carrier transfers the waste heat of the photovoltaic power generation device 11 to the heat exchanger 5 and the multi-stage phase change heat storage device 2. The multi-stage phase change heat storage device 2 supplies heat to the heat exchanger 5 through the third valve 4 and supplies heat to the user end 10 through the sixth valve 13. The third valve 4 and the sixth valve 13 can change the heat supply to the heat exchanger 5 and the user end 10 by adjusting the degree of opening. The first valve 1 and the fifth valve 12 can change the flow path of the heat carrier by adjusting the opening and closing states.

[0054] The automated monitoring equipment in the power storage and distribution device 9 monitors and adjusts the supply path and supply flow of energy flow, material flow and current in the system in real time to meet the dynamic demand of the user end 10 for heat energy, electrical energy and lithium salt products under different operating conditions.

[0055] like Figure 2 As shown, the present invention has two working modes. In the sunny working mode, the solar cells in the photovoltaic power generation device 11 receive concentrated sunlight to generate electricity, and the obtained electric energy is stored in the power storage and power distribution device 9 and distributed to the user end 10 and the electrodialysis device 8; the waste heat generated by the solar cell itself is taken away during the circulation of the heat carrier, part of the heat passes through the third valve 4 to reach the heat exchanger 5, and the other part of the heat passes through the second valve 3 directly into the multi-stage phase change heat storage device 2 for storage and temperature control, and then is transported to the user end 10 through the sixth valve 13; the normal temperature brine from the brine supply device 7 and pre-treated passes through the fourth valve 6 to reach the heat exchanger 5 and is heated, and then input into the electrodialysis device 8 for extracting the lithium salt product required by the user end 10, thereby realizing the simultaneous acquisition of electric energy, thermal energy and lithium salt products.

[0056] In rainy or low-temperature working mode, the electric energy stored in the power storage and power distribution device 9 is distributed to the user end 10 and the electrodialysis device 8 to maintain the power supply, and the thermal energy stored in the multi-stage phase change heat storage device 2 is released and directly distributed to the user end 10 and the heat exchanger 5 to maintain the thermal supply. The electrodialysis device 8 continues to extract lithium salt products under the conditions of electric energy and thermal energy supply, thereby stably and continuously producing electric energy, thermal energy and lithium salt products for the user end 10.

[0057] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0058] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An energy system for lithium extraction from salt lakes and cogeneration of heat and power, characterized in that: It comprises a multi-stage phase change heat storage device (2), a heat exchanger (5), a photovoltaic power generation device (11), a user end (10), an electrodialysis device (8) and a salt water supply device (7); The outlet of the multi-stage phase-change heat storage device (2) is divided into three paths, wherein the first path is connected to the shell-side inlet of the heat exchanger (5) via the first valve (1), the second path is connected to the shell-side inlet of the heat exchanger (5) via the fifth valve (12) and the heat absorption side of the photovoltaic power generation device (11), and the third path is connected to the user end (10) via the sixth valve (13), and a third valve (4) is provided at the shell-side inlet of the heat exchanger (5); The output end of the photovoltaic power generation device (11) is connected to the user end (10) and the electrodialysis device (8); the shell side outlet of the heat exchanger (5) is divided into two paths, one of which is connected to the inlet of the multi-stage phase change heat storage device (2), and the other is connected to the shell side inlet of the heat exchanger (5) through the second valve (3); the outlet of the salt water supply device (7) is connected to the inlet of the electrodialysis device (8) through the fourth valve (6) and the tube side of the heat exchanger (5), and the lithium salt product outlet of the electrodialysis device (8) is connected to the user end (10).

2. The energy system for lithium extraction from salt lakes and cogeneration of heat and power according to claim 1, characterized in that: The output end of the photovoltaic power generation device (11) is connected to the user end (10) and the electrodialysis device (8) via the power storage and power distribution device (9).

3. The energy system for lithium extraction from salt lake and cogeneration of heat and power according to claim 1, characterized in that: The photovoltaic power generation device (11) adopts a light collection and frequency division combination mode.

4. The energy system for extracting lithium from salt lakes and cogeneration of heat and power according to claim 1, characterized in that: The photovoltaic power generation device (11) comprises a focusing reflector, a solid frequency divider and a solar cell. The sunlight reflected by the focusing reflector is incident on the solar cell after passing through the solid frequency divider.

5. The energy system for lithium extraction from salt lake and cogeneration of heat and power according to claim 4, characterized in that: The solar cells include crystalline silicon cells, gallium arsenide thin film cells, organic solar cells, dye-sensitized photovoltaic cells, perovskite photovoltaic cells and quantum dot solar cells.

6. The energy system for lithium extraction from salt lake and cogeneration of heat and power according to claim 1, characterized in that: The multi-stage phase change heat storage device (2) contains a variety of filling phase change materials.

7. The energy system for lithium extraction from salt lake and cogeneration of heat and power according to claim 1, characterized in that: The phase change material includes paraffin, sulfate and nitrate.

8. An energy method for extracting lithium from salt lakes and cogeneration of heat and power, characterized in that: The energy system for extracting lithium from salt lakes and cogeneration of heat and power according to claim 2 comprises the following steps: In the sunny working mode, the solar cells in the photovoltaic power generation device (11) receive concentrated sunlight to generate electricity, and the resulting electric energy is stored in the user end (10) and the electrodialysis device (8); the waste heat generated in the power generation process of the photovoltaic power generation device (11) is taken away by the heat carrier medium for heat exchange, and then divided into two paths, one part of the heat enters the heat exchanger (5), and the other part of the heat enters the multi-stage phase change heat storage device (2) for storage and temperature control, and then is transported to the user end (10); the normal temperature brine output by the brine supply device (7) enters the heat exchanger (5) to absorb heat, and then enters the electrodialysis device (8) to extract the lithium salt product required by the user end (10), thereby achieving the simultaneous acquisition of electric energy, heat energy and lithium salt products; In rainy or low-temperature working mode, the electric energy stored in the power storage and power distribution device (9) is distributed to the user end (10) and the electrodialysis device (8), and the thermal energy stored in the multi-stage phase change heat storage device (2) is released and directly distributed to the user end (10) and the heat exchanger (5) to maintain the thermal energy supply. The electrodialysis device (8) continues to extract lithium salt products under the conditions of electric energy and thermal energy supply, thereby stably and continuously producing electric energy, thermal energy and lithium salt products for the user end (10).

9. The energy method for extracting lithium from salt lakes and cogeneration of heat and power according to claim 8, characterized in that: The photovoltaic power generation device (11) comprises a focusing reflector, a solid frequency divider and a solar cell. The sunlight reflected by the focusing reflector is incident on the solar cell after passing through the solid frequency divider.

10. The energy method for extracting lithium from salt lakes and cogeneration of heat and power according to claim 9, characterized in that: The solar cells include crystalline silicon cells, gallium arsenide thin film cells, organic solar cells, dye-sensitized photovoltaic cells, perovskite photovoltaic cells and quantum dot solar cells.

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