Photothermal and molten salt based multi-tank thermal storage power generation system and thermal power generation method

Abstract

This invention provides a multi-tank thermal power generation system and method based on solar thermal and molten salt, relating to the field of solar thermal power generation technology. The multi-tank thermal power generation system based on solar thermal and molten salt includes a heat transfer oil collector circuit, a first heat exchange device, a molten salt energy storage subsystem, a second heat exchange device, and a power generation system. The heat transfer oil collector circuit is connected to the molten salt energy storage subsystem via the first heat exchange device to convert absorbed solar energy into heat energy and transfer it to the molten salt energy storage subsystem. The molten salt energy storage subsystem includes multiple independently installed molten salt tanks, each storing molten salt at different temperature ranges. The power generation system is connected to the molten salt energy storage subsystem via the second heat exchange device to receive molten salt at different temperature ranges supplied by the molten salt energy storage subsystem, utilize the heat from the molten salt to generate steam, and use the steam to generate electricity. This invention can improve the peak-shaving capability of solar thermal power and adapt to the flexibility requirements of a high proportion of new energy power grids.

Description

Technical Field

[0001] This invention relates to the field of solar thermal power generation technology, and in particular to a multi-tank thermal power generation system and method based on photothermal and molten salt thermal storage. Background Technology

[0002] Driven by the "dual carbon" goal, the power system's demand for flexible peak-shaving power sources is becoming increasingly urgent. Concentrated solar power (CSP), with its combined power generation and energy storage characteristics, is considered an ideal peak-shaving resource to replace thermal power. However, traditional parabolic trough CSP plants are limited by the upper limit of the heat transfer oil temperature (approximately 400℃) and the coupled operation mode of "heat-driven power generation," resulting in the inability to decouple the thermal storage system from the power generation stage. This leads to insufficient peak-shaving response speed and low steam parameters (≤380℃ / 10MPa), making it difficult to meet the grid's demand for high-parameter, minute-level load regulation. Furthermore, although curtailed wind / solar energy can be supplemented by electrically heating molten salt, existing technologies mostly focus on single-tank thermal storage, lacking temperature gradient stage design, and failing to achieve high-grade thermal energy storage and dynamic allocation. This results in low curtailment utilization efficiency and limited peak-shaving flexibility. Therefore, an innovative solution that combines decoupled operation, temperature surge, and multi-stage thermal storage is urgently needed to improve CSP peak-shaving capabilities and adapt to the flexibility requirements of a high proportion of renewable energy grids. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this invention provides a multi-tank thermal power generation system and thermal power generation method based on solar thermal and molten salt, which can take into account the innovative solutions of decoupled operation, temperature rise and multi-stage thermal storage, so as to improve the solar thermal peak shaving capability and adapt to the flexibility requirements of high-proportion new energy power grids.

[0004] According to a first aspect of the present invention, a multi-tank thermal energy storage and power generation system based on photothermal and molten salt is provided, comprising a heat transfer oil heat collection circuit, a first heat exchange device, a molten salt energy storage subsystem, a second heat exchange device, and a power generation system; The heat transfer oil heat collection circuit is connected to the molten salt energy storage subsystem through the first heat exchange device, so as to convert the absorbed solar energy into heat energy and transfer it to the molten salt energy storage subsystem. The molten salt energy storage subsystem includes multiple independently installed molten salt tanks, each of which stores molten salt at different temperature ranges. The power generation system is connected to the molten salt energy storage subsystem through the second heat exchange device to receive molten salt of different temperature ranges supplied by the molten salt energy storage subsystem, use the heat of the molten salt to generate steam, and use the steam to generate electricity.

[0005] In some exemplary embodiments of the present invention, based on the foregoing scheme, the heat transfer oil heat collection circuit includes: Heat transfer oil delivery pipeline, with built-in heat transfer oil; A solar collector array is used to absorb solar energy and convert the absorbed solar energy into heat energy, which is then transferred to the heat transfer oil to heat the heat transfer oil; and A heat transfer oil circulation pump is used to drive the heated heat transfer oil to circulate within the heat transfer oil delivery pipeline.

[0006] In some exemplary embodiments of the present invention, based on the foregoing scheme, the molten salt energy storage subsystem includes: The first molten salt storage tank has its input end connected to the output end of the molten salt channel in the first heat exchange device, and its output end connected to the input end of the molten salt channel in the second heat exchange device. The second molten salt storage tank has its output end connected to the input end of the molten salt channel in the first heat exchange device, and its input end connected to the output end of the molten salt channel in the second heat exchange device. The temperature of the molten salt in the first lava tank is greater than the temperature of the molten salt in the second molten salt tank.

[0007] In some exemplary embodiments of the present invention, based on the foregoing scheme, the multi-tank thermal energy storage power generation system based on solar thermal and molten salt includes a mixer; the molten salt energy storage subsystem includes a first molten salt tank, a second molten salt tank, and a third molten salt tank; The input ends of the first molten salt tank and the third molten salt tank are simultaneously connected to the output end of the molten salt channel in the first heat exchange device. The output ends of the first molten salt tank and the third molten salt tank are respectively connected to the first input end and the second input end of the mixer. The output end of the second molten salt tank is connected to the input end of the molten salt channel in the first heat exchange device, and the input end of the second molten salt tank is connected to the output end of the molten salt channel in the second heat exchange device. The output of the mixer is connected to the input of the molten salt channel in the second heat exchanger; The temperature of the molten salt in the first lava tank is greater than the temperature of the molten salt in the second molten salt tank and the temperature of the molten salt in the third molten salt tank; and the temperature of the molten salt in the second molten salt tank is less than the temperature of the molten salt in the third molten salt tank.

[0008] In some exemplary embodiments of the present invention, based on the foregoing scheme, the multi-tank thermal power generation system based on solar thermal and molten salt includes: The power waste heat recovery device is located between the first molten salt storage tank and the first heat exchange device.

[0009] In some exemplary embodiments of the present invention, based on the foregoing scheme, the power waste replenishment device includes: A molten salt heater, the input end of which is connected to the output end of the molten salt channel in the first heat exchange device, and the output end of which is connected to the input end of the first molten salt storage tank.

[0010] In some exemplary embodiments of the present invention, based on the foregoing scheme, the molten salt heater is electrically connected to a photovoltaic power station.

[0011] In some exemplary embodiments of the present invention, based on the foregoing scheme, the electronic system includes: A steam turbine generator is connected to the output end of the water vapor channel in the second heat exchange device.

[0012] In some exemplary embodiments of the present invention, based on the foregoing scheme, the electronic system further includes: An air-cooling device, the input end of which is connected to the output end of the steam turbine generator; A water pump, the input end of which is connected to the output end of the air-cooling device, and the output end of which is connected to the input end of the water vapor channel in the second heat exchange device.

[0013] According to a second aspect of the present invention, a thermal power generation method is provided, the thermal power generation method comprising: In response to grid demand, molten salt in different temperature ranges in the multi-tank thermal energy storage power generation system based on solar thermal and molten salt is dynamically deployed. A method for driving power generation using molten salts at different temperature ranges. The method includes: According to a third aspect of the present invention, an electronic device is provided, comprising: a processor; and a memory storing computer-readable instructions that, when executed by the processor, implement the method of the first aspect.

[0014] According to a fourth aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the method of the first aspect.

[0015] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects: This invention utilizes multiple independent storage tanks to store molten salt within different temperature ranges, achieving temperature-zoned management of molten salt thermal energy. This not only flexibly matches the varying load demands of the power generation system, enabling on-demand energy supply adjustments, but also effectively avoids the heat loss caused by mixing molten salts at different temperatures in traditional single-tank thermal storage, as well as the thermal stress generated on the tank's inner wall due to temperature fluctuations. Furthermore, the multi-tank structure supports phased expansion, allowing the number of tanks to be gradually increased based on the scale of solar resources and the growth in electricity demand, without requiring large-scale modifications to existing heat transfer oil collector circuits and power generation systems. This enables the system to better adapt to application scenarios of different scales and needs, reducing the difficulty and limitations of future expansion. The heat transferred by the heat transfer oil collector circuit can be precisely matched to the corresponding temperature range for storage, reducing ineffective consumption during heat transfer. Simultaneously, the power generation system can utilize molten salt from different temperature ranges as needed, preventing high-grade thermal energy from being wasted due to low load requirements, effectively improving overall energy utilization efficiency.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the specification, serve to explain the principles of the invention.

[0018] Figure 1 The schematic diagram illustrates a multi-tank thermal energy storage power generation system based on solar thermal and molten salt according to an embodiment of the present invention; Figure 2 This schematic diagram illustrates another structural schematic of a multi-tank thermal power generation system based on solar thermal and molten salt according to an embodiment of the present invention; Figure 3 A schematic diagram illustrating a thermal power generation method according to some embodiments of the present invention is shown. Figure 4 The schematic diagram illustrates the structure of a computer system of an electronic device according to some embodiments of the present invention; Figure 5 A schematic diagram of a computer-readable storage medium according to some embodiments of the present invention is shown.

[0019] Explanation of reference numerals in the attached figures 100. Multi-tank thermal power generation system based on solar thermal and molten salt; 110. Thermal oil collector circuit; 111. Thermal oil delivery pipeline; 112. Solar collector array; 120. First heat exchanger; 130. Molten salt energy storage subsystem; 131. First molten salt storage tank; 132. Second molten salt storage tank; 133. Third molten salt storage tank; 140. Second heat exchanger; 150. Power generation system; 151. Steam turbine generator; 152. Air cooling device; 153. Feed water pump; 160. Molten salt heater; 161. Photovoltaic power station; 170. Mixer. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0021] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0022] It should be understood that although the terms first, second, third, etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of this invention, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0023] The embodiments of the present invention will now be described in detail.

[0024] According to a first aspect of the present invention, a multi-tank thermal energy storage and power generation system 100 based on photothermal and molten salt is provided, comprising a heat transfer oil heat collection circuit 110, a first heat exchange device 120, a molten salt energy storage subsystem 130, a second heat exchange device 140, and a power generation system 150. The heat transfer oil heat collection circuit 110 is connected to the molten salt energy storage subsystem 130 through the first heat exchange device 120, so as to convert the absorbed solar energy into heat energy and transfer it to the molten salt energy storage subsystem 130. The molten salt energy storage subsystem 130 includes at least two independently configured molten salt tanks, each of which stores molten salt in a different temperature range. The power generation system 150 is connected to the molten salt energy storage subsystem 130 through the second heat exchange device 140, so as to receive molten salt of different temperature ranges supplied by the molten salt energy storage subsystem 130, generate steam by using the heat of the molten salt, and generate electricity by using the steam.

[0025] This invention utilizes multiple independent storage tanks to store molten salt in different temperature ranges, achieving temperature-zoned management of molten salt thermal energy. This not only flexibly matches the different load demands of the power generation system 150, enabling flexible adjustment of energy supply on demand, but also effectively avoids the heat loss caused by mixing molten salt at different temperatures in traditional single-tank thermal storage, as well as the thermal stress generated on the inner wall of the tank after mixing molten salt at different temperatures. This reduces the risks of corrosion and deformation caused by temperature fluctuations in the tank. Furthermore, the multi-tank structure supports phased expansion, allowing the number of storage tanks to be gradually increased according to the scale of solar energy resources and the growth of electricity demand, without the need for large-scale modifications to the existing heat transfer oil collector circuit 110 and power generation system 150. This enables the system to better adapt to application scenarios of different scales and needs, reducing the difficulty and limitations of later expansion. The heat transferred by the heat transfer oil heat collection circuit 110 can be precisely matched with the storage tank of the corresponding temperature range for storage, reducing the ineffective consumption in the heat transfer process; at the same time, the power generation system 150 can call molten salt of different temperature ranges according to demand, avoiding the waste of high-grade heat energy due to adapting to low load demand, and effectively improving the overall energy utilization efficiency.

[0026] The heat transfer oil collector circuit 110 is used to absorb solar energy and convert it into heat energy. This invention does not limit the specific structure of the heat transfer oil collector circuit 110. In some embodiments, the heat transfer oil collector circuit 110 can be designed to include a heat transfer oil delivery pipeline 111, a solar collector array 112, and a heat transfer oil circulation pump (not shown in the figure). The heat transfer oil delivery pipeline 111 contains heat transfer oil, which can be mineral-based, synthetic, biomass-based, or special-functional heat transfer oil. As a preferred embodiment, the heat transfer oil can be a synthetic heat transfer oil, possessing characteristics of high temperature resistance and strong thermal stability.

[0027] The solar collector array 112 is used to absorb solar energy and convert the absorbed solar energy into heat energy, which is then transferred to the heat transfer oil to heat the oil. Each collector in the solar collector array 112 can be a parabolic trough collector, a dish collector, or a combination of parabolic trough collectors and dish collectors. Those skilled in the art can selectively configure the collectors according to the actual situation.

[0028] A heat transfer oil circulation pump is installed on the heat transfer oil delivery pipeline 111 to drive the heated heat transfer oil to circulate within the heat transfer oil delivery pipeline 111. One end of the heat transfer oil delivery pipeline 111 is connected to the outlet of the solar collector array 112, and the other end is connected to the hot oil inlet of the first heat exchange device 120, forming a circulation path for the heat transfer oil.

[0029] In some example embodiments, the first heat exchange device 120 is used to realize the heat transfer between the heat transfer oil and the molten salt. The first heat exchange device 120 can be a shell-and-tube heat exchanger or a plate heat exchanger. The first heat exchange device 120 has a hot oil channel and a molten salt channel, wherein the inlet of the hot oil channel is connected to the heat transfer oil delivery pipeline 111 of the heat transfer oil collector circuit 110 through a pipe, and the outlet of the hot oil channel flows back to the inlet of the solar collector array 112 through the heat transfer oil delivery pipeline 111, forming a closed loop circulation of the heat transfer oil; the inlet and outlet of the molten salt channel of the first heat exchange device 120 are respectively connected to the molten salt energy storage subsystem 130 through molten salt delivery pipelines, for transferring the heat energy transferred by the heat transfer oil to the molten salt.

[0030] In some exemplary embodiments, the molten salt energy storage subsystem 130 includes multiple independently configured molten salt tanks. Here, the multiple independently configured molten salt tanks can be two, three, four, five, etc., and the present invention does not specifically limit the number of molten salt tanks.

[0031] In some example embodiments, the multiple independently configured molten salt storage tanks are actually two molten salt storage tanks, namely, a first molten salt storage tank 131 and a second molten salt storage tank 132, see reference. Figure 1 As shown, the input end of the first molten salt storage tank 131 is connected to the output end of the molten salt channel in the first heat exchange device 120, and the output end of the first molten salt storage tank 131 is connected to the input end of the molten salt channel in the second heat exchange device 140. The output end of the second molten salt storage tank 132 is connected to the input end of the molten salt channel in the first heat exchange device 120, and the input end of the second molten salt storage tank 132 is connected to the output end of the molten salt channel in the second heat exchange device 140. The temperature of the molten salt in the first molten salt storage tank 131 is higher than the temperature of the molten salt in the second molten salt storage tank 132. That is, in this example embodiment, the first molten salt storage tank 131 is a high-temperature molten salt storage tank, and the second molten salt storage tank 132 is a low-temperature molten salt storage tank. For example, the first molten salt storage tank 131 is used to store molten salt with a temperature range above 380 degrees Celsius, and the second molten salt storage tank 132 is used to store molten salt with a temperature range between 290 degrees Celsius and 320 degrees Celsius.

[0032] In other example embodiments, the multi-tank thermal power generation system 100 based on solar thermal and molten salt includes a mixer 170, and the multiple independently configured molten salt tanks can be configured as three molten salt tanks, namely a first molten salt tank 131, a second molten salt tank 132, and a third molten salt tank 133, as shown in the reference. Figure 2 As shown, the input ends of the first molten salt storage tank 131 and the third molten salt storage tank 133 are simultaneously connected to the output end of the molten salt channel in the first heat exchange device 120. The output ends of the first molten salt storage tank 131 and the third molten salt storage tank 133 are respectively connected to the first input end and the second input end of the mixer 170. The output end of the second molten salt storage tank 132 is connected to the input end of the molten salt channel in the first heat exchange device 120, and the input end of the second molten salt storage tank 132 is connected to the output end of the molten salt channel in the second heat exchange device 140. The temperature of the molten salt in the first molten salt storage tank 131 is greater than the temperature of the molten salt in the second molten salt storage tank 132 and the temperature of the molten salt in the third molten salt storage tank 133. Furthermore, the temperature of the molten salt in the second molten salt storage tank 132 is less than the temperature of the molten salt in the third molten salt storage tank 133.

[0033] In other words, in this example embodiment, the first molten salt storage tank 131 is a high-temperature molten salt storage tank, and the second molten salt storage tank 132 is a low-temperature molten salt storage tank. For example, the first molten salt storage tank 131 is used to store molten salt with a temperature range of 450 degrees Celsius or higher, the second molten salt storage tank 132 is used to store molten salt with a temperature range of 260 degrees Celsius to 320 degrees Celsius, and the third molten salt storage tank 133 is used to store molten salt with a temperature range of 380 degrees Celsius to 450 degrees Celsius.

[0034] In some exemplary embodiments, the molten salt can be a single molten salt, such as potassium nitrate or sodium chloride; or it can be a mixed molten salt, such as a sodium nitrate-potassium nitrate mixed molten salt or a sodium chloride-potassium chloride mixed molten salt. In the exemplary embodiments of the present invention, considering that the sodium nitrate-potassium nitrate mixed molten salt has the characteristics of low melting point and high specific heat capacity, the molten salt is selected as a sodium nitrate-potassium nitrate mixed molten salt.

[0035] In addition, in some example embodiments, each molten salt storage tank can be connected to the first heat exchanger 120 and / or the second heat exchanger 140 / mixer via molten salt delivery pipelines. Furthermore, each molten salt delivery pipeline can be equipped with a control valve to adjust the delivery rate of molten salt at different temperatures as needed.

[0036] In some other example implementations, each molten salt tank may also be equipped with a lava pump at its output to drive the flow of molten salt.

[0037] The second heat exchange device 140 can be a steam generator, used to convert the thermal energy of molten salt into steam. In some example embodiments, the second heat exchange device 140 has a molten salt channel and a water vapor channel. The inlet of the molten salt channel of the second heat exchange device 140 is connected to the outlet of each molten salt storage tank in the molten salt energy storage subsystem 130 through multiple branch pipes. The outlet of the molten salt channel of the second heat exchange device 140 flows back to the corresponding molten salt storage tank through a pipe. For example, after the high-temperature molten salt flows through the second heat exchange device 140, its temperature decreases and it flows back to the second molten salt storage tank 132 (low temperature). The inlet of the water vapor channel is connected to a water supply pipe (a water supply pump 153 and a water treatment device are installed on the water supply pipe to ensure that the water quality meets the power generation requirements). The outlet of the water vapor channel is connected to the power generation system 150 to transport the generated steam to the power generation system 150.

[0038] In some example implementations, a multi-tank thermal power generation system 100 based on solar thermal and molten salt can also be designed to include a waste power replenishment device located between the first molten salt storage tank 131 and the first heat exchange device 120.

[0039] The power curtailment heating device is installed on the molten salt transport pipeline between the first molten salt storage tank 131 and the first heat exchange device 120. It is used to utilize the surplus electricity generated by the power curtailment of the grid, such as wind power, photovoltaic and other renewable energy generation due to load fluctuations, to reheat the molten salt after it has been heated by the first heat exchange device 120, thereby raising the temperature of the molten salt to the storage temperature range required by the first molten salt storage tank 131, and realizing the energy recovery and utilization of the curtailed electricity. The power curtailment heating device can be either an electric heating tube assembly or an electromagnetic heating device. Internally, it includes a molten salt flow channel and electric heating elements. The inlet of the molten salt flow channel is connected to the outlet of the molten salt channel of the first heat exchanger 120 via a pipe, and the outlet of the molten salt flow channel is connected to the inlet of the first molten salt storage tank 131 via a pipe. The electric heating elements are connected to the power curtailment connection terminal of the power grid via wires. The device is equipped with a temperature sensor and an electronic control unit. The temperature sensor monitors the temperature of the molten salt flowing through the device in real time. The electronic control unit automatically adjusts the electric heating power based on the molten salt temperature feedback and the power curtailment supply situation to ensure that the molten salt temperature stably reaches the storage requirements of the first molten salt storage tank 131. For example, if the molten salt temperature output by the first heat exchanger 120 is only 520℃, which does not reach the target storage temperature of the first molten salt storage tank 131, the electronic control unit activates the electric heating elements to use the curtailed power to heat the molten salt to 550℃.

[0040] The grid curtailment connection point can be the output terminal of the photovoltaic power station 161.

[0041] In some example embodiments, the power generation system 150 includes a steam turbine generator 151 for generating electricity using steam generated by the second heat exchanger 140. The steam turbine generator 151, as the core power generation component of the power generation system 150, includes a steam turbine and a generator. The steam inlet of the steam turbine is the input terminal of the steam turbine generator 151, connected to the output terminal (water vapor channel outlet) of the second heat exchanger 140 via a pipe, for receiving steam generated by the second heat exchanger 140. The output shaft of the steam turbine is rigidly connected to the rotor of the generator. When high-temperature, high-pressure steam enters the steam turbine, it drives the turbine rotor to rotate, thereby driving the generator rotor to rotate synchronously, converting mechanical energy into electrical energy. The exhaust port of the steam turbine is the output terminal of the steam turbine generator 151, used to discharge the exhaust steam after work, and connected to the input terminal of the air-cooling device 152 via a pipe.

[0042] In some other example embodiments, the generator system 150 also includes an air-cooling device 152 and a feedwater pump 153. The air-cooling device 152 condenses the exhaust steam from the turbine generator 151 into water, avoiding the dependence on water resources inherent in traditional water-cooling methods, making it particularly suitable for water-scarce areas. The air-cooling device 152 can be a direct air-cooling system or an indirect air-cooling system. Its input end is connected to the output end (turbine exhaust port) of the turbine generator 151 via a pipe. After receiving the exhaust steam, an axial flow fan drives air to flow through the heat dissipation tube bundle of the air-cooled condenser, exchanging heat with the exhaust steam within the tube bundle, causing the exhaust steam to condense into condensate. The output end of the air-cooling device 152 is connected to the input end of the feedwater pump 153 via a pipe, for transporting the condensed condensate to the feedwater pump 153.

[0043] The feedwater pump 153 provides pressurized feedwater to the steam-water passage of the second heat exchanger 140 to ensure stable steam generation. The input end of the feedwater pump 153 is connected to the output end of the air-cooled unit 152 via a pipeline to receive condensate. The output end of the feedwater pump 153 is connected to the input end of the steam-water passage in the second heat exchanger 140 via a pipeline, pressurizing the condensate (e.g., to 16-18 MPa) and then delivering it to the output end of the steam-water passage of the second heat exchanger 140 to complete the circulation of the working fluid. Simultaneously, the feedwater pump 153 can be configured with a variable frequency speed control unit to adjust the feedwater flow rate and pressure according to the steam generation requirements of the second heat exchanger 140, improving the economic efficiency of system operation.

[0044] The working process of the system described in this embodiment mainly includes a heat energy collection and storage stage and a heat energy release and power generation stage. The two stages can be carried out in parallel or alternately.

[0045] During the heat collection and storage stage, when there is solar energy supply and the photovoltaic power station 161 experiences power curtailment, such as when the midday sunlight is strong and the output of the photovoltaic power station 161 exceeds the grid's capacity, resulting in power curtailment, the heat transfer oil circulation pump of the heat transfer oil collector circuit 110 is activated, driving the heat transfer oil to flow in the heat absorption tubes of the collector array; the solar collector array 112 gathers solar energy through reflectors, and the heat transfer oil absorbs solar energy and its temperature rises, such as from 260 degrees Celsius to 380 degrees Celsius; the high-temperature heat transfer oil is transported through pipelines to the hot oil channel of the first heat exchange device 120, where it exchanges heat with the low-temperature molten salt in the molten salt channel of the first heat exchange device 120, such as the 260°C molten salt transported from the second molten salt storage tank 132, transferring heat energy to the molten salt and causing the molten salt temperature to initially rise.

[0046] The molten salt, after initial heating by the first heat exchanger 120, is transported through the first output end of the molten salt channel of the first heat exchanger 120 to the input end of the molten salt heater 160 or the input end of the third molten salt storage tank 133 for storage. Meanwhile, the molten salt entering the molten salt heater 160 receives electricity from the photovoltaic power station 161 via a dedicated line, which is then fed to the electric heating element of the molten salt heater 160. The control unit, based on the molten salt temperature monitored by the temperature sensor and the amount of electricity supplied by the photovoltaic power station, adjusts the power of the electric heating element. The molten salt is reheated by using surplus photovoltaic power to raise its temperature to the target storage temperature of the first molten salt storage tank 131, such as 500 degrees Celsius. The reheated high-temperature molten salt is then transported from the output end of the molten salt heater 160 to the input end of the first molten salt storage tank 131 for storage, thus completing the collection, reheating, and storage of thermal energy. The heat transfer oil, after releasing its thermal energy (its temperature drops to about 320 degrees Celsius), flows back to the solar collector array 112 through a pipeline to continue absorbing solar energy, forming a circulation of the heat transfer oil.

[0047] If only solar energy is available, the molten salt heated by the first heat exchanger 120 (e.g., reaching a temperature of 360 degrees Celsius) is directly transported through pipelines to the first molten salt storage tank 131 for storage. During the heat release and power generation phase, when power generation is required (regardless of whether there is solar power supply or photovoltaic curtailment, such as during peak daytime electricity consumption or at night), the amount of molten salt transported at different temperatures is adjusted by controlling the control valves at the outlets of the first molten salt storage tank 131 and the third molten salt storage tank 133, according to the load demand of the power generation system 150: if full-load power generation is required, the high-temperature molten salt (550℃) in the first molten salt storage tank 131 can be mainly transported; if partial-load power generation is required, the high-temperature molten salt in the first molten salt storage tank 131 and the low-temperature molten salt (400℃) in the third molten salt storage tank 133 can be transported together, or only the warm molten salt in the third molten salt storage tank 133 can be transported (under base load).

[0048] Steam generation: Molten salt is transported through a pipeline to the molten salt channel of the second heat exchanger 140, where it exchanges heat with the feed water (pressurized feed water from the feed water pump 153) in the steam-water channel, heating the feed water to saturated steam or superheated steam (such as generating superheated steam at 530℃ and 15MPa). The generated steam is then transported to the input end of the steam turbine generator 151 through the output end of the steam-water channel in the second heat exchanger 140.

[0049] Power generation process: High-temperature and high-pressure steam enters the turbine of the steam turbine generator 151, driving the turbine rotor to rotate, which in turn drives the generator rotor to rotate and generate electricity. The generated electricity is connected to the power grid through transmission lines or directly supplied to the load. The exhaust steam discharged after the steam turbine has done its work (e.g., temperature 40℃, pressure 0.005MPa) is transported to the input end of the air-cooling device 152 through the output end of the steam turbine generator 151.

[0050] Working fluid circulation: The air-cooled unit 152 starts the axial flow fan and vacuum equipment, and the air flows through the air-cooled condenser to exchange heat with the exhaust steam, causing the exhaust steam to condense into condensate (e.g., at a temperature of 35°C). The condensate is transported through the output end of the air-cooled unit 152 to the input end of the feedwater pump 153. The feedwater pump 153 pressurizes the condensate (e.g., pressurizes it to 17MPa) and then transports it to the third input end of the second heat exchange unit 140, where it enters the water-steam channel to participate in heat exchange again, completing the closed-loop circulation of the working fluid. If the generator system 150 is equipped with a regenerative system, the condensate output by the feedwater pump 153 will first pass through the regenerative system and be heated to a high temperature (e.g., 250°C) by the steam extracted from the turbine before entering the second heat exchange unit 140, further improving the thermal energy utilization efficiency.

[0051] Furthermore, when the molten salt energy storage subsystem 130 is equipped with more than two molten salt storage tanks (such as three, namely low temperature, medium temperature and high temperature molten salt storage tanks), an independent molten salt heater 160 can be added between the corresponding medium temperature / high temperature storage tank and the first heat exchange device 120, or a single molten salt heater 160 can be switched by valves to provide supplemental heat for the molten salt in different storage tanks; at the same time, the steam turbine generator 151 of the power generation system 150 can adopt a multi-cylinder structure to adapt to steam with different parameters, further refining the load regulation capability. Its working principle is the same as that of the above embodiment, only requiring corresponding adjustments to the pipeline connection method and the control logic of the electrical control unit, which will not be described in detail here.

[0052] According to a second aspect of the present invention, a thermal power generation method is provided, with reference to Figure 3 As shown, thermal power generation methods include: S310: In response to grid demand, dynamically call up molten salt in different temperature ranges in the multi-tank thermal energy storage power generation system 100 based on solar thermal and molten salt. S320: Power generation is driven by molten salt in different temperature ranges.

[0053] In some example implementations, before dynamically calling the molten salt in the multi-tank thermal power generation system 100 based on solar thermal and molten salt at different temperature ranges in response to grid demand in S310, the thermal power generation method further includes: The heat transfer oil heat collection circuit 110 in the multi-tank thermal power generation system 100 based on solar thermal and molten salt is used for heat collection, the molten salt energy storage subsystem 130 is used for heat storage, the power waste heat compensation device is used for heat compensation and storage, and the power generation system 150 is on standby independently.

[0054] In other words, the heat transfer oil collector circuit 110 operates independently and is not directly linked to the power generation process. When the heat transfer oil circulation pump is started, the heat transfer oil absorbs heat and heats up in the solar collector array 112 (e.g., from 300℃ to 400℃), then enters the dedicated heat exchange channel of the first heat exchange device 120. It exchanges heat with the low-temperature molten salt (260-320℃) transported by the third molten salt storage tank 133, raising the temperature of the molten salt to 360-450℃ (medium temperature), and then directly transports it back to the third molten salt storage tank 133 for storage. The heat transfer oil (around 320℃) after releasing heat energy flows back to the mirror field collector array to continuously collect and store heat, ensuring that the heat from the mirror field is only used to supplement the storage capacity of the medium-temperature storage tank and does not directly participate in the power generation heat supply.

[0055] After obtaining information on the 161 periods of power curtailment at the photovoltaic power station (such as excess photovoltaic output during the daytime hours of 12:00-14:00), a "power curtailment compensation command" is sent to the control center. The control center commands the power curtailment compensation device to switch to the medium-temperature molten salt heating mode: the medium-temperature molten salt (360-450℃) in the third molten salt storage tank 133 enters through the dedicated flow channel of the power curtailment compensation device, and the electric heating element uses the photovoltaic power curtailment to perform secondary heating, raising the molten salt temperature to 500-560℃ (high temperature); the heated high-temperature molten salt is transported through pipelines to the first high-temperature storage tank for storage, completing the conversion and storage of curtailed heat energy into high-temperature molten salt; at the same time, the mirror field heat collection circuit continuously replenishes the medium-temperature molten salt to the third molten salt storage tank 133 to ensure the stability of the medium-temperature storage tank during the power curtailment compensation process.

[0056] The entire process can be expressed as: Start the heat transfer oil circulation pump in the heat transfer oil collector circuit 110 to drive the heat transfer oil to flow in the solar collector array 112. The solar energy is gathered to the heat absorption tube through the solar collector array 112, so that the temperature of the heat transfer oil rises after absorbing the solar energy. The heated heat transfer oil is transported to the hot oil channel of the first heat exchange device 120, and the low-temperature molten salt in the second molten salt storage tank 132 is transported to the molten salt channel through the first input end of the molten salt channel of the first heat exchange device 120, so that the high-temperature heat transfer oil and the low-temperature molten salt exchange heat in the first heat exchange device 120. After heat exchange, the molten salt is diverted along the first output end of the molten salt channel of the first heat exchange device 120: part of the molten salt is heated to the storage temperature range of the third molten salt storage tank 133 and directly transported to the third molten salt storage tank 133 for storage; the other part of the molten salt is transported to the power waste heat recovery device. If there is power curtailment at the photovoltaic power station 161, the curtailed power is transmitted to the molten salt heater 160 of the power curtailment heat recovery device, and the electric heating element of the molten salt heater 160 is used to perform secondary heat recovery on another part of the molten salt. The temperature of the molten salt is monitored in real time by the temperature sensor of the power waste heat recovery device. Combined with the target storage temperature range of the first molten salt storage tank 131, the heating power of the electric heating element is adjusted by the electronic control unit so that the temperature of another part of the molten salt reaches the storage temperature range of the first molten salt storage tank 131. The high-temperature molten salt after reheating is transported to the first molten salt storage tank 131 for storage; the heat transfer oil after releasing heat energy flows back to the solar collector array 112 through pipelines to continue participating in the heat transfer oil circulation. If the temperature of the molten salt diverted to the waste power replenishment device has reached the storage temperature range of the first molten salt storage tank 131, it is directly transported to the first molten salt storage tank 131; if it has not reached the temperature range, it is transported to the third molten salt storage tank 133 for storage.

[0057] In S310, in response to grid demand, the molten salt in the multi-tank thermal energy storage power generation system 100 based on solar thermal and molten salt, which is located in different temperature ranges, is dynamically called.

[0058] In some example implementations, grid demand may be to ensure basic power supply, fill load gaps, or prevent thermal storage overflow. Thus, the multi-tank thermal storage power generation system 100 based on solar thermal and molten salt may exist in several different modes, such as baseload mode: the grid needs to stabilize the supply of basic load power, such as from 20:00 at night to 6:00 the next day; peak shaving mode: the grid needs to cope with peak loads, such as the peak electricity consumption from 18:00 to 20:00 during the day; extreme curtailment scenario mode: the grid curtails large amounts of electricity for a long period of time, such as continuous 24-hour photovoltaic curtailment.

[0059] Under baseload mode, the grid demand signal characteristics are: the real-time grid load is stable at 40%-50%, and the dispatch command requires "stable power generation to ensure basic power supply". At this time, there is no need for high-parameter steam, and only medium-temperature molten salt needs to be called to meet the baseload power generation demand.

[0060] In peak shaving mode, the characteristics of the grid demand signal are: the real-time load of the grid suddenly increases to more than 80%, and the dispatching command requires "increasing power generation to fill the load gap". At this time, it is necessary to mix high temperature and medium temperature molten salt and increase steam parameters to meet the peak shaving power generation demand.

[0061] In extreme power curtailment scenarios, the grid demand signal characteristics are as follows: the molten salt storage capacity of the first high-temperature storage tank reaches more than 90%, and the dispatch instruction requires "prioritizing the consumption of high-temperature molten salt to avoid heat overflow." At this time, it is necessary to separately call on high-temperature molten salt for power generation to quickly consume the high-temperature molten salt storage capacity.

[0062] In S320, molten salts at different temperature ranges are used to drive power generation.

[0063] In baseload mode, medium-temperature molten salt drives stable power generation. The medium-temperature molten salt entering the molten salt channel of the second heat exchanger 140 undergoes stable heat exchange with the feedwater in the steam channel. After releasing heat energy, the medium-temperature molten salt cools down to a low temperature and flows back to the second low-temperature storage tank through the first output end of the second heat exchanger 140. The feedwater absorbs heat energy and heats up to form low-parameter saturated steam (e.g., 5 MPa), which meets the steam demand for baseload power generation.

[0064] Low-parameter steam is delivered to the turbine of the steam turbine generator 151 through the steam-water passage outlet of the second heat exchanger 140, driving the turbine rotor to rotate at a constant speed (e.g., 3000 r / min). The turbine output shaft drives the generator rotor to rotate synchronously, converting mechanical energy into electrical energy. The generator regulates the excitation current through the excitation system to ensure stable voltage and frequency of the output power, maintaining the power generation capacity at 40% to 60% of the rated power (e.g., 25MW output for a 50MW unit), continuously meeting the base load power supply demand of the grid. During power generation, the turbine inlet valve is kept at 50% opening to avoid power fluctuations caused by frequent adjustments.

[0065] In peak-shaving mode: High- and low-temperature mixed molten salt drives high-efficiency power generation. The mixed molten salt (formed by mixing the molten salt output from the first molten salt tank 131 and the molten salt output from the third molten salt tank 133 in the mixer) enters the molten salt channel of the second heat exchanger 140 and undergoes high-intensity heat exchange with the feedwater in the steam-water channel. After releasing heat energy, the mixed molten salt cools down and flows back to the second low-temperature tank; the feedwater absorbs a large amount of heat energy and heats up to form medium- and high-parameter (e.g., 12 MPa) superheated steam, which has the energy to drive the steam turbine to operate at full load.

[0066] High-parameter steam rapidly enters the turbine of the steam turbine generator 151. The high-pressure steam drives the turbine rotor to accelerate to the rated speed, and the turbine inlet valve is fully opened (100% opening), driving the generator to operate at the rated power (e.g., 50MW output from a 50MW unit), quickly filling the grid load gap. The generator monitors the grid frequency in real time and fine-tunes the steam intake of the turbine through the speed regulation system to keep the matching deviation between the power generation and the grid load within the target range (e.g., ±2%). At the same time, the steam performs work in multiple stages in the turbine, effectively improving energy conversion efficiency and ensuring the economic efficiency of power generation during peak shaving.

[0067] In extreme power curtailment scenarios, high-temperature molten salt drives full-load power generation. The high-temperature molten salt entering the 140 molten salt channel of the second heat exchanger releases high-grade heat energy and exchanges heat with the feedwater. After cooling, the high-temperature molten salt flows back to the second cryogenic storage tank. The feedwater absorbs heat energy and heats up, forming high-parameter (e.g., 15MPa) superheated steam, providing the turbine with maximum working capacity. This high-parameter steam enters the turbine's high-pressure, intermediate-pressure, and low-pressure cylinders at high speed, performing multi-stage work and driving the turbine rotor to rotate stably at its rated speed. The generator operates continuously at 100% rated power, rapidly consuming the high-temperature molten salt reserves (e.g., a 50MW unit consumes 200t of high-temperature molten salt per hour). During power generation, the turbine monitoring system monitors the steam temperature, pressure, and cylinder temperature in real time to prevent equipment overheating due to high-temperature steam. The generator's output electricity is prioritized for grid connection. If the grid's capacity is insufficient, some electricity can be stored in a matching energy storage battery via an energy storage converter, and then connected to the grid after the grid load recovers, ensuring no energy waste.

[0068] Therefore, this invention designs differentiated power generation processes for molten salts in different temperature ranges: medium-temperature molten salts meet the needs of stable base load power supply, mixed molten salts meet the needs of efficient peak-shaving power supply, and high-temperature molten salts meet the needs of rapid absorption in extreme scenarios, covering all load demand scenarios of the power grid.

[0069] Furthermore, in an exemplary embodiment of the present invention, an electronic device capable of implementing the above-described thermal power generation method is also provided.

[0070] Those skilled in the art will understand that various aspects of the present invention can be implemented as systems, methods, or program products. Therefore, various aspects of the present invention can be specifically implemented as entirely hardware embodiments, entirely software embodiments (including firmware, microcode, etc.), or embodiments combining hardware and software aspects, collectively referred to herein as “circuit,” “module,” or “system.”

[0071] The following reference Figure 4 To describe an electronic device 400 according to such an embodiment of the present invention. Figure 4 The electronic device 400 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of the present invention.

[0072] like Figure 4 As shown, the electronic device 400 is manifested in the form of a general-purpose computing device. The components of the electronic device 400 may include, but are not limited to: at least one processing unit 410, at least one storage unit 420, a bus 430 connecting different system components (including storage unit 420 and processing unit 410), and a display unit 440.

[0073] The storage unit stores program code that can be executed by the processing unit 410, causing the processing unit 410 to perform the steps described in the "Exemplary Method" section above, based on various exemplary embodiments of the present invention. For example, the processing unit 410 can perform actions such as... Figure 3 As shown in S310, in response to grid demand, the molten salt in the multi-tank thermal energy storage power generation system 100 based on solar thermal and molten salt, which is in different temperature ranges, is dynamically called; S320, the molten salt in different temperature ranges is used to drive power generation.

[0074] Storage unit 420 may include readable media in the form of volatile storage units, such as random access memory (RAM) 421 and / or cache memory 422, and may further include read-only memory (ROM) 423.

[0075] Storage unit 420 may also include a program / utility 424 having a set (at least one) of program modules 425, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0076] Bus 430 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0077] Electronic device 400 can also communicate with one or more external devices 470 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with electronic device 400, and / or with any device that enables electronic device 400 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 450. Furthermore, electronic device 400 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 460. As shown, network adapter 460 communicates with other modules of electronic device 400 via bus 430. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0078] Through the description of the above embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions of the embodiments of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, portable hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the methods according to the embodiments of the present invention.

[0079] In exemplary embodiments of the present invention, a computer-readable storage medium is also provided, on which a program product capable of implementing the methods described above is stored. In some possible embodiments, various aspects of the present invention may also be implemented as a program product comprising program code, which, when the program product is run on a terminal device, causes the terminal device to perform the steps of the various exemplary embodiments of the present invention described in the "Exemplary Methods" section above.

[0080] refer to Figure 5 As shown, a program product 500 for implementing the above-described thermal power generation method according to an embodiment of the present invention is described. It may employ a portable compact disc read-only memory (CD-ROM) and include program code, and may run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited thereto. In the present invention, the readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0081] The program product may employ any combination of one or more readable storage media. Readable storage media may be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0082] Program code for performing the operations of this invention can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0083] Furthermore, the above figures are merely illustrative of the processes included in the method according to exemplary embodiments of the present invention, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0084] Through the description of the above embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions of the embodiments of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, portable hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the methods according to the embodiments of the present invention.

[0085] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

[0086] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A multi-tank thermal energy storage and power generation system based on solar thermal and molten salt, characterized in that, It includes a heat transfer oil heat collection circuit, a first heat exchange device, a molten salt energy storage subsystem, a second heat exchange device, and a power generation system; The heat transfer oil heat collection circuit is connected to the molten salt energy storage subsystem through the first heat exchange device, so as to convert the absorbed solar energy into heat energy and transfer it to the molten salt energy storage subsystem. The molten salt energy storage subsystem includes multiple independently installed molten salt tanks, each of which stores molten salt at different temperature ranges. The power generation system is connected to the molten salt energy storage subsystem through the second heat exchange device to receive molten salt of different temperature ranges supplied by the molten salt energy storage subsystem, use the heat of the molten salt to generate steam, and use the steam to generate electricity.

2. The multi-tank thermal power generation system based on solar thermal and molten salt according to claim 1, characterized in that, The heat transfer oil heat collection circuit includes: Heat transfer oil delivery pipeline, with built-in heat transfer oil; A solar collector array is used to absorb solar energy and convert the absorbed solar energy into heat energy, which is then transferred to the heat transfer oil to heat the heat transfer oil; and A heat transfer oil circulation pump is used to drive the heated heat transfer oil to circulate within the heat transfer oil delivery pipeline.

3. The multi-tank thermal power generation system based on solar thermal and molten salt according to claim 1, characterized in that, The molten salt energy storage subsystem includes: The first molten salt storage tank has its input end connected to the output end of the molten salt channel in the first heat exchange device, and its output end connected to the input end of the molten salt channel in the second heat exchange device. The second molten salt storage tank has its output end connected to the input end of the molten salt channel in the first heat exchange device, and its input end connected to the output end of the molten salt channel in the second heat exchange device. The temperature of the molten salt in the first lava tank is greater than the temperature of the molten salt in the second molten salt tank.

4. The multi-tank thermal power generation system based on solar thermal and molten salt according to claim 1, characterized in that, The multi-tank thermal power generation system based on solar thermal and molten salt includes a mixer; the molten salt energy storage subsystem includes a first molten salt tank, a second molten salt tank, and a third molten salt tank. The input ends of the first molten salt tank and the third molten salt tank are simultaneously connected to the output end of the molten salt channel in the first heat exchange device. The output ends of the first molten salt tank and the third molten salt tank are respectively connected to the first input end and the second input end of the mixer. The output end of the second molten salt tank is connected to the input end of the molten salt channel in the first heat exchange device, and the input end of the second molten salt tank is connected to the output end of the molten salt channel in the second heat exchange device. The output of the mixer is connected to the input of the molten salt channel in the second heat exchanger; The temperature of the molten salt in the first lava tank is greater than the temperature of the molten salt in the second molten salt tank and the temperature of the molten salt in the third molten salt tank; and the temperature of the molten salt in the second molten salt tank is less than the temperature of the molten salt in the third molten salt tank.

5. The multi-tank thermal power generation system based on solar thermal and molten salt according to claim 4, characterized in that, The multi-tank thermal energy storage power generation system based on solar thermal and molten salt includes: The power waste heat recovery device is located between the first molten salt storage tank and the first heat exchange device.

6. The multi-tank thermal power generation system based on solar thermal and molten salt according to claim 5, characterized in that, The power waste heat replenishment device includes: A molten salt heater, the input end of which is connected to the output end of the molten salt channel in the first heat exchange device, and the output end of which is connected to the input end of the first molten salt storage tank.

7. The multi-tank thermal power generation system based on solar thermal and molten salt according to claim 6, characterized in that, The molten salt heater is electrically connected to the photovoltaic power station.

8. The multi-tank thermal power generation system based on solar thermal and molten salt according to claim 1, characterized in that, The electron-generating system includes: A steam turbine generator is connected to the output end of the water vapor channel in the second heat exchange device.

9. The multi-tank thermal power generation system based on solar thermal and molten salt according to claim 8, characterized in that, The electronic power generation system also includes: An air-cooling device, the input end of which is connected to the output end of the steam turbine generator; A water pump, the input end of which is connected to the output end of the air-cooling device, and the output end of which is connected to the input end of the water vapor channel in the second heat exchange device.

10. A method for generating thermal power, characterized in that, The thermal power generation method includes: In response to grid demand, molten salt in different temperature ranges in the multi-tank thermal power generation system based on solar thermal and molten salt as described in any one of claims 1-9 is dynamically called upon; The molten salts, which are located in different temperature ranges, are used to drive power generation.

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