Solid particle-based heat storage for combined heat and power systems and control methods

Abstract

The present application relates to a kind of cogeneration system and control method, the cogeneration system includes: steam generator unit and solar heat collection unit;First gas-solid heat exchanger, adapted to heat the first solid particles passing through first gas-solid heat exchanger with the heat of heat transfer working medium led out from solar heat collection unit, first solid particles are warmed to second solid particles, and heat transfer working medium after releasing heat returns to solar heat collection unit;First storage device, adapted to store second solid particles;Second gas-solid heat exchanger, second solid particles are adapted to be heat exchanged with fluid flowing through second gas-solid heat exchanger in second gas-solid heat exchanger to be cooled to first solid particles, and fluid is entered into steam generator unit after being warmed;Particle conveying device, for returning first solid particles from second gas-solid heat exchanger to first gas-solid heat exchanger.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of solar thermal power generation technology, and in particular to a cogeneration system based on solid particle heat storage and release, and a control method for a cogeneration system based on solid particle heat storage and release. Background Technology

[0002] In solar thermal power plants, solar energy is first converted into heat energy and then into electrical energy. The addition of a thermal storage system can eliminate the intermittency of solar energy and the influence of weather factors, ensuring the continuous operation of the solar thermal power plant. The characteristics of the thermal storage medium are an important factor affecting the performance of the thermal storage system. Currently, thermal storage media that have attracted much attention from researchers include air, water / steam, heat transfer oil, organic matter, molten salt and liquid metal, and solid particles. Among them, air thermal storage has poor thermal conductivity and low efficiency; water / steam thermal storage has poor heat transfer performance; heat transfer oil and organic matter have high long-term thermal storage costs; molten salt and liquid metal have strong corrosiveness at high temperatures; none of the above thermal storage technologies are the best choice for the efficient and flexible cogeneration of electricity and heat in solar thermal power plants under the goal of building new power systems. Solid particles are widely available, low in cost, have good thermal stability and material compatibility, high upper limit of operating temperature, excellent pneumatic transport and heat transfer performance, and the system is simple and easy to control, which is conducive to the full utilization of stored heat. Solid particle thermal storage and release technology for solar thermal power plants will enter a stage of rapid development.

[0003] However, current thermal energy storage technologies suffer from problems such as short energy storage time, high cost, low energy efficiency, and strong corrosivity; there is also an urgent need to break through the flexible, efficient, and economical cogeneration technology of solar thermal power plants based on solid particle thermal energy storage. Summary of the Invention

[0004] This invention addresses at least one aspect or point of technical problems in existing technologies, such as the current thermal energy storage technology's low energy efficiency, high cost, and susceptibility to corrosion at high temperatures. It also addresses the urgent need for breakthroughs in flexible, efficient, and economical combined heat and power (CHP) technology for solar thermal power plants based on solid particle thermal energy storage.

[0005] According to one aspect of an embodiment of the present invention, a combined heat and power system is provided, comprising:

[0006] Steam generator sets and solar thermal collectors;

[0007] The first gas-solid heat exchanger is adapted to heat the first solid particles passing through the first gas-solid heat exchanger with the heat of the heat transfer medium drawn from the solar collector unit. After the first solid particles are heated, they become second solid particles. The heat transfer medium that has released heat returns to the solar collector unit.

[0008] A first storage device is adapted to store the second solid particles;

[0009] The second gas-solid heat exchanger is used to cool down the second solid particles from the first storage device by exchanging heat with the fluid flowing through the second gas-solid heat exchanger. The fluid flowing through the second gas-solid heat exchanger is heated and at least a portion of it enters the steam generator set.

[0010] A particle conveying device is used to return first solid particles from a second gas-solid heat exchanger to the first gas-solid heat exchanger.

[0011] According to another aspect of an embodiment of the present invention, a control method for cogeneration is proposed, comprising the steps of:

[0012] In the first gas-solid heat exchanger, the heat of the heat transfer medium, which is the first fluid, drawn from the solar collector unit, heats the first solid particles passing through the first gas-solid heat exchanger. After the first solid particles are heated, they become second solid particles. The first fluid, after releasing heat, returns to the solar collector unit.

[0013] The heated second solid particles are stored in the first storage device;

[0014] The stored second solid particles are introduced into the second gas-solid heat exchanger to heat the second fluid flowing through the second gas-solid heat exchanger. After heat exchange, the second solid particles become the first solid particles, and after heat exchange and temperature increase, the second fluid becomes the third fluid.

[0015] The third fluid is introduced into the steam generator set;

[0016] The first solid particles flowing out of the second gas-solid heat exchanger will return to the first gas-solid heat exchanger. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a cogeneration system based on solid particle thermal storage according to an exemplary embodiment of the present invention.

[0018] Figure label:

[0019] 101. Solar collector unit; 102. Heat transfer medium; 103. Air heater or first heat exchanger; 104. High-temperature air; 105. Low-temperature particle storage tank; 106. High-temperature gas-solid mixing heat exchanger; 107. High-temperature particle storage tank; 108. High-temperature particles; 109. Medium-temperature air; 110. Medium-temperature heat exchanger; 111. Air after heat exchange; 112. Hot water; 113. Particle conveying device; 114. Low-temperature particles; 115. Gas-solid mixing multi-stage heat exchanger; 116. Hot air; 117. Steam; 118. Ambient air; 119. Ambient water; 120. Electricity; 200. Steam generator set; 300. Heating network or heating unit. Detailed Implementation

[0020] The following is a reference to the appendix. Figure 1 The description of the embodiments of the present invention is intended to explain the overall inventive concept of the present invention, and should not be construed as a limitation of the present invention.

[0021] The present invention aims to address at least one of the shortcomings of the prior art by proposing a cogeneration system based on solid particle heat storage and release, and a cogeneration system and method for a solar thermal Rankine cycle power plant based on solid particle heat storage and release.

[0022] like Figure 1 As shown, a combined heat and power system based on solid particle heat storage and release is proposed, including a steam generator set 200, a solar collector unit 101, a heat transfer medium 102, an air heater 103, a low-temperature particle storage tank 105, a high-temperature gas-solid mixing heat exchanger 106, a high-temperature particle storage tank 107, a medium-temperature heat exchanger 110, a multi-stage gas-solid mixing heat exchanger 115, a particle conveying device 113, and connecting components.

[0023] In this invention, the heat storage medium is solid particles. The heat storage particles are selected from stable solid particles, such as quartz sand, alumina particles, iron oxide particles, and inert ash. Compared to using liquid, gaseous, or other easily phase-changeable working media (such as molten salt) for heat storage, using stable solid particles offers a wider operating temperature range, stable performance at high temperatures, and facilitates the staged coupling absorption and subsequent release of various energies. Furthermore, since it can operate at higher temperatures (above 900°C), the heat absorption by solid particles improves heat utilization efficiency, and the cost is low.

[0024] In this invention, the high-temperature solid particles have a temperature, for example, between 500-800°C.

[0025] Gas-solid heat exchangers can be gas-solid mixed structures such as fluidized beds, bubbling beds, moving beds, and air-flow beds.

[0026] The particle conveying device 113 may be in the form of a gas-solid conveying pump or other devices suitable for conveying solid particles.

[0027] As will be understood, in this invention, the high-temperature particle storage tank 107 is an insulated tank, so that even if the solid particles have been stored for a long time, such as 12 hours, they can still be kept at a high temperature.

[0028] After solid particles exchange heat in a gas-solid heat exchanger, the gas and solid particles can be separated by a dedicated gas-solid separator, or by bubbling fluidization to make the gas flow upward and the solid particles flow downward, thereby completing heat exchange and separation in the mixed flow. This will not be elaborated further here.

[0029] The heat transfer medium in this invention, namely the heat transfer medium generated in the solar collector unit 101, can be heat transfer oil or molten salt. After releasing heat, the heat transfer medium returns to the solar collector unit 101, thereby achieving heat storage by reducing the load on the steam generator set 200.

[0030] In this invention, such as Figure 1 As shown, a high-temperature solid particle heat storage unit is composed of a steam generator set 200, a solar collector unit 101, a heat transfer medium 102, an air heater 103, a high-temperature gas-solid mixing heat exchanger 106, and a high-temperature particle storage tank 107. A gas-solid mixing multi-stage heat release unit is composed of a high-temperature particle storage tank 107, a gas-solid mixing multi-stage heat exchanger 115, and a steam generator set 200.

[0031] Based on solid particle heat storage and release, the solar thermal Rankine cycle power plant not only realizes the heating capacity of the solar thermal Rankine cycle power plant, but also effectively improves the peak-shaving capacity of the power grid.

[0032] Thermal storage process: During off-peak electricity demand, the surplus high-temperature heat transfer medium generated by the solar collector unit 101 enters the air heater 103 to generate high-temperature air. Solid particles enter the high-temperature gas-solid flow heat exchanger 106 from the cold particle storage tank 105, where they come into direct contact with the high-temperature air. Heat transfer is completed through mixing of the gas and solid phases. After heating, the particles (400~600℃) enter the high-temperature particle storage tank 107 for storage. Through parameter control, the outlet air temperature of the high-temperature gas-solid mixing heat exchanger 106 (approximately 200℃) is used as the heat source for the subsequent medium-temperature heat exchanger 110 to produce hot water (55~65℃) for use in the heating network or steam generator set. The air (65~75℃) after heat exchange is then added to the air heater 103.

[0033] Heat release process: High-temperature particles 108 pass through a multi-stage gas-solid mixing heat exchanger 115 in sequence, heating room-temperature water step by step, and then return to the low-temperature particle storage tank 105 via the particle conveying device 113, completing the heat release. In addition, the room-temperature air in the gas-solid mixing multi-stage heat exchanger 115 is heated due to series utilization, so the hot air at the outlet enters the high-temperature heat storage unit to realize waste heat utilization.

[0034] Dual power and heat supply: ambient temperature water is heated in stages by high temperature particles to generate superheated steam. According to actual needs, the superheated steam parameters (400~550 ℃) at the superheater outlet are controlled by adjusting the particle flow rate, heat exchange medium flow rate and heat exchange area, and used as the working medium for the steam generator set; and a certain proportion of hot water (80~90 ℃) can be extracted from the intermediate stage to enhance the heating of the solar thermal Rankine cycle power station.

[0035] In this invention, the surplus heat from deep peak shaving of a steam generator set is stored using solid particles, achieving deep coupling between the solid particle thermal storage unit, multi-stage heat release unit, waste heat utilization, and the solar thermal Rankine cycle power plant. It features three flexible operation and control methods: thermal storage, parallel thermal storage and release, and heat release. This realizes the heating capacity of the solar thermal power plant, enhances the grid's peak shaving capability, and achieves flexible, efficient, and economical dual supply of electricity and heat from the solar thermal Rankine cycle power plant. Through waste heat utilization and flexible operation and control during the thermal storage and release process, high-temperature long-term thermal storage is achieved, improving energy efficiency and reducing operating costs. Solid particle thermal storage and multi-stage heat release enhance the deep peak shaving capability and flexible heating capability of the steam generator set, achieving efficient and economical thermoelectric decoupling. Furthermore, waste heat utilization and flexible operation and control during the thermal storage and release process improve the utilization efficiency and operational flexibility of the high-temperature thermal storage and release system.

[0036] Figure 1 This is an exemplary embodiment of the present invention, and the present invention may have other variations.

[0037] For example, the low-temperature particle storage tank 105 may not be set up. That is, the high-temperature particles are directly returned to the gas-solid mixing heat exchanger 106 after releasing heat, which can form a cycle of heat absorption and release of solid particles. Alternatively, after the solid particles are placed in the gas-solid mixing heat exchanger 106 to absorb heat, they can be collected in the high-temperature particle storage tank 107 to start the heat release cycle when the heat of the high-temperature particles needs to be released.

[0038] For example, the air heater 103 can be omitted, meaning the heat exchange medium 102 of the solar collector unit 101 can directly release heat to the low-temperature particles in the gas-solid mixing heat exchanger 106 and then return to the solar collector unit 101. In this case, the medium-temperature heat exchanger 110 can be omitted.

[0039] In the cogeneration system of the present invention, the intermediate temperature heat exchanger 110 may not be required, thereby Figure 1 The medium-temperature air 109 can directly enter the air heater 103.

[0040] In the cogeneration system of the present invention, the heat network 300 may not be provided. In this way, the hot water 112 from the medium temperature heat exchanger 110 or the hot water 112 from the gas-solid mixing multi-stage heat exchanger 115 can be fed into the steam generator set 200.

[0041] In the cogeneration system of the present invention, optionally, during the heat release process, the fluidizing air of the gas-solid mixing multi-stage heat exchanger 115 can be changed from ambient air 118 to heat-exchanged air 111, so as to realize the direct and efficient utilization of the waste heat of the heat-exchanged air.

[0042] In the cogeneration system of the present invention, optionally, the medium-temperature heat exchanger 110 and the air heater 103 may not be installed. In this case, the heating network 300 is provided with hot water or steam only by the gas-solid mixing multi-stage heat exchanger 115.

[0043] Based on the above, the present invention proposes the following technical solution:

[0044] 1. A combined heat and power system, comprising:

[0045] Steam generator sets and solar thermal collectors;

[0046] The first gas-solid heat exchanger is adapted to heat the first solid particles passing through the first gas-solid heat exchanger with the heat of the heat transfer medium drawn from the solar collector unit. After the first solid particles are heated, they become second solid particles. The heat transfer medium that has released heat returns to the solar collector unit.

[0047] A first storage device is adapted to store the second solid particles;

[0048] The second gas-solid heat exchanger is used to cool down the second solid particles from the first storage device by exchanging heat with the fluid flowing through the second gas-solid heat exchanger. The fluid flowing through the second gas-solid heat exchanger is heated and at least a portion of it enters the steam generator set.

[0049] A particle conveying device is used to return first solid particles from a second gas-solid heat exchanger to the first gas-solid heat exchanger.

[0050] 2. The cogeneration system according to claim 1 further includes:

[0051] The second storage device, the particle conveying device is used to convey the first solid particles from the second gas-solid heat exchanger into the second storage device for storage, and the second storage device is connected to the first gas-solid heat exchanger to provide the first solid particles.

[0052] 3. The cogeneration system according to claim 1 further includes:

[0053] The first heat exchange device is used to heat the first air flowing through it, which is then returned to the solar collector unit. The first air, after being heated by the first heat exchanger, becomes the second air.

[0054] in:

[0055] The first solid particles are adapted to absorb heat from the second air in the first gas-solid heat exchanger, and the second air is adapted to be cooled down to the third air by the first solid particles, and the first solid particles are heated to become the second solid particles.

[0056] 4. According to the cogeneration system described in 3, wherein:

[0057] The third air is suitable for direct introduction into the first heat exchanger; or

[0058] The cogeneration system further includes a second heat exchange device, a third air that is adapted to flow through the second heat exchange device and exchange heat with the first water that flows through the second heat exchange device, the third air that is adapted to be cooled into a fourth air, the first water that is adapted to be heated into a second water after flowing through the second heat exchange device, and the fourth air that is adapted to be introduced into the first heat exchange device or the second gas-solid heat exchanger.

[0059] 5. The cogeneration system according to 4 further includes:

[0060] A heating unit for supplying heat, wherein: second water from a second heat exchanger is adapted to be supplied to the heating unit and / or a steam generator set, and the fluid flowing through the second gas-solid heat exchanger, including first water and hot water and / or steam formed after heating, is adapted to be in communication with the heating unit.

[0061] 6. According to the cogeneration system described in 5, wherein:

[0062] The fluid flowing through the second gas-solid heat exchanger includes first air, which is heated by the second gas-solid heat exchanger to become fifth air, and the fifth air is suitable for being introduced into the first heat exchange device;

[0063] The fluid flowing through the second gas-solid heat exchanger includes first water, which is heated by the second gas-solid heat exchanger to become superheated steam. The superheated steam is suitable for being introduced into a steam generator set as a power generation medium.

[0064] 7. The cogeneration system according to claim 1 further includes:

[0065] A heating unit for supplying heat, wherein: the fluid flowing through the second gas-solid heat exchanger includes first water and is heated by the second gas-solid heat exchanger to be in communication with the heating unit.

[0066] 8. A control method for a combined heat and power system, comprising the following steps:

[0067] In the first gas-solid heat exchanger, the heat of the heat transfer medium, which is the first fluid, drawn from the solar collector unit, heats the first solid particles passing through the first gas-solid heat exchanger. After the first solid particles are heated, they become second solid particles. The first fluid, after releasing heat, returns to the solar collector unit.

[0068] The heated second solid particles are stored in the first storage device;

[0069] The stored second solid particles are introduced into the second gas-solid heat exchanger to heat the second fluid flowing through the second gas-solid heat exchanger. After heat exchange, the second solid particles become the first solid particles, and after heat exchange and temperature increase, the second fluid becomes the third fluid.

[0070] The third fluid is introduced into the steam generator set;

[0071] The first solid particles flowing out of the second gas-solid heat exchanger will return to the first gas-solid heat exchanger.

[0072] 9. According to the method described in 8, wherein:

[0073] The first fluid drawn from the solar collector unit passes directly through the first gas-solid heat exchanger. In the first gas-solid heat exchanger, the heat from the first fluid drawn from the solar collector unit heats the first solid particles passing through the first gas-solid heat exchanger. After exchanging heat with the first solid particles, the cooled first fluid returns to the solar collector unit.

[0074] 10. According to the method described in 8, wherein:

[0075] The first fluid drawn from the solar collector unit is introduced into the first heat exchange device to heat the first air flowing through the first heat exchange device and then returns to the solar collector unit. The first air becomes the second air after being heated by the first heat exchange device.

[0076] The first solid particles are adapted to absorb heat from the second air in the first gas-solid heat exchanger, and the second air is adapted to be cooled down to the third air by the first solid particles, and the first solid particles are heated to become the second solid particles.

[0077] 11. The method according to 10 further includes the step of:

[0078] The third air flows through the second heat exchanger and exchanges heat with the first water flowing through the second heat exchanger. The third air is suitable for cooling down to become the fourth air, and the first water is suitable for heating up to become the second water. The fourth air is suitable for being introduced into the first heat exchanger or the second gas-solid heat exchanger.

[0079] 12. The method according to 8 or 11 further includes the step of:

[0080] The second water supply is then provided to the heating unit.

[0081] 13. According to the method described in 8, wherein:

[0082] The third fluid includes superheated steam.

[0083] 14. According to the method described in 8, wherein:

[0084] The step of “returning the first solid particles flowing out of the second gas-solid heat exchanger to the first gas-solid heat exchanger” includes: conveying the first solid particles flowing out of the second gas-solid heat exchanger to the second storage device using a particle conveying device, and providing the first solid particles stored in the second storage device to the first gas-solid heat exchanger.

[0085] 15. The method according to any one of 8-14 further includes the step of:

[0086] When the load demand of the steam generator set decreases, the heat from the first fluid drawn from the solar collector unit is used to heat the first solid particles passing through the first gas-solid heat exchanger, and to store the second solid particles.

[0087] When the load demand of the steam generator set increases, heat is released from the second solid particles to heat the power-generating working fluid or fluid entering the steam generator set.

[0088] 16. The method according to 12 further includes the step of:

[0089] By adjusting the particle flow rate, the heat exchange medium flow rate, and the heat exchange area, the parameters of the steam exiting the second gas-solid heat exchanger, which serves as the power generation medium for the steam generator set, are controlled; and

[0090] As needed, a certain proportion of the second water is extracted from the intermediate stage of the second gas-solid heat exchanger and sent to the heating unit to enhance the heating capacity of the steam generator set.

[0091] In this invention, low-temperature particles refer to particles with a temperature below 100°C. High-temperature heat exchangers, on the other hand, have a temperature above 600°C.

[0092] In this invention, "medium temperature" refers to a temperature range of 150~250°C. "Normal temperature" refers to a temperature range of 20~50°C. "Hot water" refers to water with a temperature range of 50~95°C. "Hot air" refers to wind or air with a temperature range of 250~350°C.

[0093] In this invention, the numerical range, unless otherwise specified, includes endpoint values, and the numerical range also includes the midpoint value of the range.

[0094] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations and combinations of elements may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A combined heat and power system, comprising: Steam generator sets and solar thermal collectors; The first gas-solid heat exchanger is adapted to heat the first solid particles passing through the first gas-solid heat exchanger with the heat of the heat transfer medium drawn from the solar collector unit. After the first solid particles are heated, they become second solid particles. The heat transfer medium that has released heat returns to the solar collector unit. A first storage device is adapted to store the second solid particles; The second gas-solid heat exchanger is used to cool down the second solid particles from the first storage device by exchanging heat with the fluid flowing through the second gas-solid heat exchanger. The fluid flowing through the second gas-solid heat exchanger is heated and at least a portion of it enters the steam generator set. A particle conveying device is used to return first solid particles from a second gas-solid heat exchanger to the first gas-solid heat exchanger. A heating unit and a second heat exchange device are provided. The first gas-solid heat exchanger is connected to the heating unit through the second heat exchange device, and the water generated by the heat exchange of the second heat exchange device is introduced into the heating unit. The second gas-solid heat exchanger is connected to the heating unit, and the water generated by the heat exchange of the second gas-solid heat exchanger is introduced into the heating unit.

2. The cogeneration system according to claim 1 further includes: The second storage device, the particle conveying device is used to convey the first solid particles from the second gas-solid heat exchanger into the second storage device for storage, and the second storage device is connected to the first gas-solid heat exchanger to provide the first solid particles.

3. The cogeneration system according to claim 1 further includes: The first heat exchange device is used to heat the first air flowing through it, which is then returned to the solar collector unit. The first air, after being heated by the first heat exchanger, becomes the second air. in: The first solid particles are adapted to absorb heat from the second air in the first gas-solid heat exchanger, and the second air is adapted to be cooled down to the third air by the first solid particles, and the first solid particles are heated to become the second solid particles.

4. The cogeneration system according to claim 3, wherein: The third air is suitable for direct introduction into the first heat exchange device; or The third air is adapted to flow through the second heat exchanger and exchange heat with the first water flowing through the second heat exchanger. The third air is adapted to be cooled to become the fourth air. The first water is adapted to be heated to become the second water after flowing through the second heat exchanger. The fourth air is adapted to be introduced into the first heat exchanger or the second gas-solid heat exchanger.

5. The cogeneration system according to claim 4, wherein: The second water from the second heat exchanger is adapted to be supplied to the heating unit and / or the steam generator set, and the fluid flowing through the second gas-solid heat exchanger includes the first water and the hot water and / or steam formed after heating is adapted to be in communication with the heating unit.

6. The cogeneration system according to claim 5, wherein: The fluid flowing through the second gas-solid heat exchanger includes first air, which is heated by the second gas-solid heat exchanger to become fifth air, and the fifth air is suitable for being introduced into the first heat exchange device; The fluid flowing through the second gas-solid heat exchanger includes first water, which is heated by the second gas-solid heat exchanger to become superheated steam. The superheated steam is suitable for being introduced into a steam generator set as a power generation medium.

7. The cogeneration system according to claim 1, wherein: The fluid flowing through the second gas-solid heat exchanger includes the first water and the hot water and / or steam formed after being heated by the second gas-solid heat exchanger, which are suitable for communication with the heating unit.

8. A control method for combined heat and power (CHP), comprising the following steps: In the first gas-solid heat exchanger, the heat of the heat transfer medium, which is the first fluid, drawn from the solar collector unit, heats the first solid particles passing through the first gas-solid heat exchanger. After the first solid particles are heated, they become second solid particles. The first fluid, after releasing heat, returns to the solar collector unit. The heated second solid particles are stored in the first storage device; The stored second solid particles are introduced into the second gas-solid heat exchanger to heat the second fluid flowing through the second gas-solid heat exchanger. After heat exchange, the second solid particles become the first solid particles, and after heat exchange and temperature increase, the second fluid becomes the third fluid. The third fluid is introduced into the steam generator set; The first solid particles flowing out of the second gas-solid heat exchanger will return to the first gas-solid heat exchanger. The first gas-solid heat exchanger is connected to the heating unit through a second heat exchange device, and the water generated by the second heat exchange device is fed into the heating unit; the second gas-solid heat exchanger is connected to the heating unit, and the water generated by the second gas-solid heat exchanger is fed into the heating unit.

9. The method according to claim 8, wherein: The first fluid drawn from the solar collector unit passes directly through the first gas-solid heat exchanger. In the first gas-solid heat exchanger, the heat from the first fluid drawn from the solar collector unit heats the first solid particles passing through the first gas-solid heat exchanger. After exchanging heat with the first solid particles, the cooled first fluid returns to the solar collector unit.

10. The method according to claim 8, wherein: The first fluid drawn from the solar collector unit is introduced into the first heat exchange device to heat the first air flowing through the first heat exchange device and then returns to the solar collector unit. The first air becomes the second air after being heated by the first heat exchange device. The first solid particles are adapted to absorb heat from the second air in the first gas-solid heat exchanger, and the second air is adapted to be cooled down to the third air by the first solid particles, and the first solid particles are heated to become the second solid particles.

11. The method of claim 10, further comprising the step of: The third air flows through the second heat exchanger and exchanges heat with the first water flowing through the second heat exchanger. The third air is suitable for cooling down to become the fourth air, and the first water is suitable for heating up to become the second water. The fourth air is suitable for being introduced into the first heat exchanger or the second gas-solid heat exchanger.

12. The method according to claim 8 or 11, further comprising the step of: The second water supply is then provided to the heating unit.

13. The method according to claim 8, wherein: The third fluid includes superheated steam.

14. The method according to claim 8, wherein: The step of "returning the first solid particles flowing out of the second gas-solid heat exchanger to the first gas-solid heat exchanger" includes: conveying the first solid particles flowing out of the second gas-solid heat exchanger to the second storage device using a particle conveying device, and providing the first solid particles stored in the second storage device to the first gas-solid heat exchanger.

15. The method according to any one of claims 8-11, 13, and 14, further comprising the step of: When the load demand of the steam generator set decreases, the heat of the first fluid drawn from the solar collector unit heats the first solid particles passing through the first gas-solid heat exchanger, and stores the second solid particles. When the load demand of the steam generator set increases, heat is released from the second solid particles to heat the power-generating working fluid or fluid entering the steam generator set.

16. The method of claim 12, further comprising the step of: By adjusting the particle flow rate, the heat exchange medium flow rate, and the heat exchange area, the parameters of the steam exiting the second gas-solid heat exchanger, which serves as the power generation medium for the steam generator set, are controlled; and As needed, a certain proportion of the second water is extracted from the intermediate stage of the second gas-solid heat exchanger and sent to the heating unit to enhance the heating capacity of the steam generator set.

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