A molten salt thermal energy storage Stirling power generation system and method

Abstract

The present invention discloses a solar-thermal molten salt energy storage Stirling power generation system, which includes a solar-thermal molten salt energy storage device and a Stirling power generation device. The solar-thermal molten salt energy storage device includes a solar collector and a molten salt tank (4), and molten salt is placed in the molten salt tank (4). The solar collector is connected to the molten salt tank (4) through a first molten salt pump. The Stirling power generation device (7) includes a hot end (5) and a cold end (8). The hot end (5) is connected to the solar collector and the molten salt tank (4), and the molten salt tank (4) is connected to the hot end (5) of the Stirling power generation device (7) through a second molten salt pump. The present invention realizes the solar-thermal collection and storage of heat of the solar collector through high-temperature molten salt and the molten salt tank; realizes a non-integrated external Stirling generator, reduces the complexity and installation difficulty of the dish solar-thermal Stirling power generation system; and realizes the stable power generation output of the Stirling generator under all-day and all-climate conditions.

Description

Technical Field

[0001] The present invention belongs to the field of energy utilization, and particularly relates to a molten salt thermal energy storage Stirling power generation system and method using solar energy. Background Art

[0002] With the increasing tension of global energy consumption, people's attention to the environment has been strengthened. Energy shortage and environmental pollution have become important issues affecting people's lives and restricting social development. Countries around the world are working hard to develop clean new energy sources.

[0003] Solar energy is the most abundant and reliable resource. The energy irradiated by sunlight received by the earth every 40 minutes is equivalent to the total energy consumption of the world in one year. Solar power generation is a new renewable energy technology. The characteristics of solar energy being clean, pollution-free and renewable make it a powerful alternative to traditional fossil energy. In the past decade, solar power generation has received increasing attention due to its huge potential and good environmental performance. In the newly added power generation installed capacity in the European Union in 2010, solar power generation exceeded wind power for the first time and became the renewable energy power with the largest newly added power generation installed capacity in the European Union. With the technological progress and scale expansion of the global solar power generation industry, solar power generation is about to become an important renewable energy after hydropower and wind power and become an important part of the power system.

[0004] Solar thermal power generation includes trough solar power generation systems, tower solar power generation systems and dish solar power generation systems. Among them, the dish solar thermal Stirling generator currently has the highest photoelectric conversion efficiency. However, the current dish solar thermal Stirling generator can only generate electricity under the condition of sunlight during the day. Therefore, the power it provides to the power grid is an unstable power generation source and has no peak shaving ability for the power grid. Therefore, there is an urgent need to develop a technology that can stably generate electricity output and achieve energy storage under all-weather conditions of 24 hours a day.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a molten salt thermal energy storage Stirling power generation system using solar energy to solve the problems that the existing dish solar thermal Stirling generator cannot generate electricity and store energy at night.

[0007] In order to achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions:

[0008] A molten-salt thermal storage Stirling power generation system using solar heat, comprising a molten-salt thermal storage device using solar heat and a Stirling power generation device. The molten-salt thermal storage device using solar heat includes a solar heat collection device and a molten-salt tank, and molten salt is placed in the molten-salt tank. The solar heat collection device is connected to the molten-salt tank through a first molten-salt pump. The Stirling power generation device includes a hot end and a cold end. The hot end is connected to the solar heat collection device and the molten-salt tank, and the molten-salt tank is connected to the hot end of the Stirling power generation device through a second molten-salt pump.

[0009] Preferably, a heat exchange device is provided at the cold end, and the heat exchange device exchanges heat through air or water.

[0010] Preferably, the molten-salt tank of the power generation system is connected to a plurality of solar heat collection devices, and the molten-salt tank can store the heat collected by the plurality of solar heat collection devices connected thereto.

[0011] Preferably, a burner is provided at a position on one side of the hot end of the Stirling power generation device, and the burner can heat the hot end to provide heat for the hot end of the Stirling power generation device.

[0012] Preferably, the power generation system includes a molten-salt heat exchanger, which is connected to the molten-salt tank. The molten salt in the molten-salt tank can convert water into steam or hot water for external heat supply through the molten-salt heat exchanger.

[0013] Preferably, the power generation system includes a molten-salt heat exchanger, which is connected to the molten-salt tank; the Stirling power generation system is arranged in parallel with a thermal power unit power generation system, and part of the steam generated by the thermal power unit is pumped to the molten-salt heat exchanger and transfers its heat to the molten salt in the molten-salt heat exchanger.

[0014] A method for molten-salt thermal storage Stirling power generation using solar heat, which is executed by the above-mentioned molten-salt thermal storage Stirling power generation system using solar heat. The power generation method includes the following steps:

[0015] S1: Liquefy the molten salt in the molten-salt tank;

[0016] S2: Determine whether there is sunlight? If yes, execute step S3; if no, execute step S4;

[0017] S3: Start the photovoltaic molten-salt thermal storage device, and the Stirling power generation device driven by molten salt generates electricity;

[0018] S4: Determine whether the heat storage amount and the molten-salt temperature in the molten-salt tank can drive the Stirling power generation device? If yes, execute step S5; if no, execute step S2;

[0019] S5: Start the Stirling power generation device driven by molten salt to generate electricity.

[0020] Preferably, step S3 includes the following steps:

[0021] S31: Start the molten salt thermal storage device using solar heat;

[0022] S32: The solar heat collection device heats the molten salt to raise its temperature;

[0023] S33: Send the heated molten salt to the hot end of the external Stirling power generation device, and the corresponding Stirling power generation device generates electricity.

[0024] A method for generating electricity by molten salt thermal storage using solar heat in a Stirling power generation system, which is executed by the above-mentioned molten salt thermal storage Stirling power generation system. The power generation method includes the following steps:

[0025] S1: Liquefy the molten salt in the molten salt tank;

[0026] S2: Determine whether there is sunlight? If yes, execute step S3; if no, execute step S4;

[0027] S3: Start the molten salt thermal storage device using solar heat, and the Stirling power generation device driven by the molten salt generates electricity;

[0028] S4: Determine whether the heat storage amount and the temperature of the molten salt in the molten salt tank can drive the Stirling power generation device? If yes, execute step S5; if no, execute step S6;

[0029] S5: Start the Stirling power generation device driven by the molten salt to generate electricity;

[0030] S6: Start the burner to heat the hot end, raise the temperature of the molten salt in the hot end, and the high-temperature molten salt drives the Stirling power generation device to generate electricity.

[0031] Preferably, the step S3 includes the following steps:

[0032] S31: Start the molten salt thermal storage device using solar heat;

[0033] S32: The solar heat collection device heats the molten salt to raise its temperature;

[0034] S33: Send the heated molten salt to the hot end of the external Stirling power generation device, and the corresponding Stirling power generation device generates electricity.

[0035] Beneficial effects

[0036] 1. The solar heat collection and storage of the solar heat collection device are realized through high-temperature molten salt and the molten salt tank;

[0037] 2. By using the molten salt tank for heat storage and the high-temperature molten salt pipeline for heat transfer, a non-integrated external Stirling generator can be realized, reducing the complexity and installation difficulty of the dish-type solar thermal Stirling power generation system;

[0038] 3. By using the molten salt tank for heat storage and the high-temperature molten salt to drive the Stirling generator, stable power generation output of the Stirling generator can be realized for 24 hours a day and under all weather conditions;

[0039] 4. The non-integrated external Stirling generator makes it possible to supplement power generation by heating the hot end with gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is the working schematic diagram of the photo-thermal molten salt energy storage Stirling power generation system of Embodiment 1 of the power generation system of the present invention when there is light;

[0041] Figure 2 It is the working schematic diagram of the photo-thermal molten salt energy storage Stirling power generation system of Embodiment 1 of the power generation system of the present invention when there is no light;

[0042] Figure 3 It is the operation steps of the Stirling power generation system method in Embodiment 1;

[0043] Figure 4 It is the working schematic diagram of the photo-thermal molten salt energy storage Stirling power generation system coupled with gas of Embodiment 2 of the power generation system of the present invention when there is light;

[0044] Figure 5 It is the working schematic diagram of the photo-thermal molten salt energy storage Stirling power generation system coupled with gas of Embodiment 2 of the power generation system of the present invention when there is no light;

[0045] Figure 6 It is the working schematic diagram of the photo-thermal molten salt energy storage Stirling power generation system coupled with gas of Embodiment 2 of the power generation system of the present invention when there is no light;

[0046] Figure 7 It is the operation steps of the Stirling power generation system method in Embodiment 2;

[0047] Figure 8 It is the working schematic diagram of the photo-thermal molten salt energy storage Stirling power generation system of Embodiment 3 of the power generation system of the present invention when there is light;

[0048] Figure 9 It is the working schematic diagram of the photo-thermal molten salt energy storage Stirling power generation system of Embodiment 3 of the power generation system of the present invention when there is no light;

[0049] Figure 10 It is the steam heating schematic diagram of the photo-thermal molten salt energy storage Stirling power generation system of Embodiment 3 of the power generation system of the present invention;

[0050] Figure 11 It is the working schematic diagram of the photo-thermal molten salt energy storage Stirling power generation system of Embodiment 4 of the power generation system of the present invention when there is light;

[0051] Figure 12 It is the working schematic diagram of the photo-thermal molten salt energy storage Stirling power generation system of Embodiment 4 of the power generation system of the present invention when there is no light;

[0052] Figure 13This is the schematic diagram of steam heat storage for the solar-thermal molten salt energy storage Stirling power generation system according to Embodiment 4 of the power generation system of the present invention;

[0053] Description of the reference numerals in the drawings

[0054] To further clearly illustrate the structure of the present invention and the connection relationships between various components, the following reference numerals are given and explained.

[0055] Collector 1, concentrator 2, electric heater 3, molten salt tank 4, hot end 5, burner 6, Stirling power generation device 7, cold end 8, molten salt heat exchanger 9.

[0056] Through the description of the above reference numerals and in combination with the embodiments of the present invention, the technical solution of the present invention can be more clearly understood and explained. Detailed implementation manners

[0057] The present invention will be further described below in conjunction with specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it. However, the scope claimed by the present invention is not limited to the scope described in the detailed implementation manners. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0058] Embodiment 1

[0059] A solar-thermal molten salt energy storage Stirling power generation system, as Figure 1 shown, the power generation system includes a solar-thermal molten salt energy storage device and a Stirling power generation device 7. The solar-thermal molten salt energy storage device includes a solar energy collection device and a molten salt tank 4. The solar energy collection device includes a collector 1 and a concentrator 2. The concentrator 2 focuses sunlight into the collector 1, and the collector 1 converts solar energy into heat energy.

[0060] A heat storage working medium is placed in the molten salt tank 4, and the heat storage working medium is salt. An electric heater 3 is provided in the molten salt tank 4, and the electric heater 3 is used to heat the heat storage working medium to a fluid state. The heat storage temperature in the molten salt tank 4 ranges from 50°C to 1000°C. The molten salt includes any one or several combinations of alkali metals or alkaline earth metals and halides, silicates, carbonates, nitrates, and phosphates. The molten salt is a binary salt, a ternary salt, or a multi-component combined salt.

[0061] The solar energy collection device is connected to the molten salt tank 4 through a first molten salt pump, and the first molten salt pump can pump the fluid heat storage working medium in the molten salt tank 4 to the collector 1.

[0062] The Stirling power generation device 7 includes a hot end 5 and a cold end 8. Its hot end 5 is connected to the collector 1 and the molten salt tank 4. The molten salt tank 4 is connected to the hot end 5 of the Stirling power generation device 7 through a second molten salt pump. The cold end 8 is provided with a heat exchange device, and cold water is passed through the heat exchange device. After passing through the heat exchange device, the cold water absorbs the remaining heat of the cold end 8 and heats up, and then hot water flows out for heating or domestic hot water.

[0063] The fluid state heat storage working medium in the molten salt tank 4 can enter the collector 1 through the first molten salt pump, and can also enter the hot end 5 of the Stirling power generation device 7 through the second molten salt pump.

[0064] The molten salt tank 4 of the power generation system is connected to a plurality of solar heat collection devices. The size of the molten salt tank 4 is set to be able to store the heat collected by the corresponding plurality of solar heat collection devices connected thereto, and to meet the heat requirements for the Stirling power generation device or heating throughout 24 hours of the day.

[0065] The Stirling power generation device 7 is a Stirling generator.

[0066] As Figure 1 shown, when there is light, the fluid state heat storage working medium in the molten salt tank 4 enters the collector 1 through the first molten salt pump, absorbs the heat energy converted from solar energy received by the collector 1, and heats up to high-temperature molten salt. The high-temperature molten salt enters the hot end 5 of the Stirling power generation device 7 through a pipeline, thereby heating the hot end 5, forming a temperature difference between the hot end 5 and the cold end 8, providing power for the Stirling power generation device 7, and the Stirling power generation device 7 generates electricity. The fluid molten salt after cooling at the hot end 5 returns to the molten salt tank 4 through a pipeline, thereby forming a recycling. Cold water or air (along the R1 direction) is passed through the heat exchange device at the cold end 8. After passing through the heat exchange device, the cold water or air absorbs the remaining heat of the cold end 8 and heats up, and then hot water (along the R2 direction) flows out for heating or domestic hot water.

[0067] As Figure 2 shown, when there is no light or the light is weak, the electric heater 3 in the molten salt tank 4 heats the working medium in the molten salt tank 4, and determines whether the heat storage amount and the molten salt temperature in the molten salt tank 4 can drive the Stirling power generation device. If not, step S2 is executed; if so, the second molten salt pump is opened, and the high-temperature molten salt enters the hot end 5 of the Stirling power generation device 7, forming a temperature difference between the hot end 5 and the cold end 8, providing power for the Stirling power generation device 7, and the Stirling power generation device 7 generates electricity. The fluid molten salt after cooling at the hot end 5 returns to the molten salt tank 4 through a pipeline, thereby forming a recycling. Cold water is passed through the heat exchange device at the cold end 8. After passing through the heat exchange device, the cold water absorbs the remaining heat of the cold end 8 and heats up, and then hot water flows out for heating or domestic hot water.

[0068] As Figure 3 shown, the light-thermal molten salt heat storage Stirling power generation method includes the following steps:

[0069] S1: Use electric heating to liquefy the molten salt in the molten salt tank;

[0070] S2: Determine whether there is light? If yes, execute step S3; if no, execute step S4;

[0071] S3: Start the photovoltaic molten salt thermal energy storage device, and the Stirling power generation device driven by molten salt generates electricity;

[0072] S4: Determine whether the heat storage amount and molten salt temperature in the molten salt tank can drive the Stirling power generation device? If yes, execute step S5; if no, execute step S2;

[0073] S5: Start the Stirling power generation device driven by molten salt to generate electricity.

[0074] When the above Stirling power generation system generates electricity, the waste heat at the cold end of the Stirling power generation device produces hot water for heating or domestic hot water.

[0075] The specific steps of the above step S3 are as follows:

[0076] S31: Start the photovoltaic molten salt thermal energy storage device;

[0077] S32: The solar energy collector heats the molten salt to raise the temperature;

[0078] S33: Send the heated molten salt to the hot end of the external Stirling power generation device, and the corresponding Stirling power generation device generates electricity.

[0079] Embodiment 2

[0080] This embodiment has the same principle as Embodiment 1, and the main difference is that: the photovoltaic molten salt thermal energy storage Stirling power generation system is coupled with gas to form a Stirling power generation system with photovoltaic molten salt thermal energy storage coupled with gas.

[0081] As Figures 4 - 6 , the power generation system includes a burner 6. The Stirling power generation device 7 can use high-temperature molten salt as the heat source for its hot end 5 as in Embodiment 1. The hot end 5 of the Stirling power generation device 7 is provided with a molten salt heating surface, and a burner 6 is provided on one side of the molten salt heating surface. The burner 6 is a gas heat source device, and the burner 6 can heat the molten salt in the hot end 5; that is, the gas heat source device in the burner 6 generates heat and transports it to the hot end 5 of the Stirling power generation device 7 located on one side, so as to raise the temperature of the hot end 5, form a temperature difference between the hot end 5 and the cold end 8, provide power for the Stirling power generation device 7, and the Stirling power generation device 7 generates electricity. Cold water is passed through the heat exchange device at the cold end 8, and the cold water absorbs the remaining heat of the cold end 8 and then warms up, so as to flow out hot water for heating or domestic hot water.

[0082] The hot end of the external non-integrated Stirling power generation device can also use gas combustion to provide heat, and the gas used can be any one of the combustible gases such as natural gas, biomass gas, marsh gas, coke oven gas, hydrogen, etc.

[0083] like Figure 7 The Stirling power generation method of photothermal molten salt heat storage coupled with gas comprises the following steps:

[0084] S1: liquefy the molten salt in the molten salt tank by electric heating;

[0085] S2: Determine whether there is light. If yes, go to step S3; if no, go to step S4;

[0086] S3: Start the solar thermal molten salt heat storage device, and generate electricity using the Stirling power generation device driven by the molten salt;

[0087] S4: Determine whether the heat storage amount and molten salt temperature in the molten salt tank can drive the Stirling power generation device? If yes, execute step S5; if no, execute step S6;

[0088] S5: Start the Stirling power generation device driven by molten salt to generate electricity;

[0089] S6: Start the burner to heat the hot end, so that the molten salt in the hot end is heated up, and the high-temperature molten salt drives the Stirling power generation device to generate electricity.

[0090] The specific steps of step S3 are as follows:

[0091] S31: Start the solar thermal molten salt heat storage device;

[0092] S32: A solar thermal collector heats the molten salt to increase its temperature;

[0093] S33: sending the heated molten salt to the hot end of the external Stirling power generation device, and the corresponding Stirling power generation device generates electricity;

[0094] When the above Stirling power generation system generates electricity, the waste heat at the cold end of the Stirling power generation device produces hot water for heating or domestic hot water.

[0095] Embodiment 3

[0096] The principle of this embodiment is the same as that of the first embodiment, and the main difference is that the power generation system includes a molten salt heat exchanger 9, such as Figure 10 The molten salt heat exchanger 9 is connected to the molten salt tank 4. The molten salt in the molten salt tank 4 can change water into steam through the molten salt heat exchanger 9, and the steam is transported to a small steam turbine, a heater, a shaft seal system or a thermal system to provide steam heating; it can also supply industrial steam to the outside. In addition, the molten salt in the molten salt tank 4 can convert water into hot water through the molten salt heat exchanger 9 for external heating.

[0097] likeFigures 8 - 9 When the power generation system works, the working steps are the same as those in the first embodiment. When steam supply is required, molten salt will pass through the molten salt heat exchanger 9.

[0098] Embodiment 4

[0099] This embodiment has the same principle as the first embodiment. The main difference is that the Stirling power generation system and the thermal power unit power generation system are installed side by side. At this time, the peak shaving extraction steam of the thermal power unit uses the molten salt in the molten salt heat exchanger 9 and the molten salt tank 4 for heat storage peak shaving; as Figure 13 the power generation system includes a molten salt heat exchanger 9, the molten salt heat exchanger 9 is connected to the molten salt tank 4, and the molten salt in the molten salt tank 4 passes through the molten salt heat exchanger 9; in order to reduce the grid-connected power, the thermal power unit increases the extraction steam volume of the steam turbine system, thereby reducing the power generation of the unit. The increased part of the steam passes through the molten salt heat exchanger 9, and the heat of the steam is transferred to the molten salt in the molten salt heat exchanger 9, thereby heating the molten salt to achieve heat storage peak shaving. When the power grid transitions to the peak electricity consumption period, on the one hand, the heat stored by the molten salt can be directly used for power generation through the Stirling power generation system, and on the other hand, the molten salt heat storage can generate superheated steam with sufficient temperature and pressure parameters and return to the steam turbine to increase the power generation of the unit.

[0100] On the one hand, the steam heat stored by the molten salt is converted into steam through the molten salt heat exchanger for power generation by the thermal power unit, and on the other hand, when the heat is sufficient, it can also be used for Stirling power generation by heating the hot end of the Stirling power generation device. Preferably, Stirling power generation is carried out by heating the hot end of the Stirling power generation device.

[0101] As Figures 11 - 12 When the power generation system works, the working steps are the same as those in the first embodiment. When peak shaving is required, the above measures can be taken.

[0102] The present invention has the following beneficial effects:

[0103] 1. The high-temperature molten salt and the molten salt tank are used to realize the solar heat collection and heat storage of the solar heat collection device;

[0104] 2. By using the molten salt tank for heat storage and the high-temperature molten salt pipeline for heat transfer, a non-integrated external Stirling power generation device can be realized, reducing the complexity and installation difficulty of the dish-type solar thermal Stirling power generation system;

[0105] 3. By using the molten salt tank for heat storage and the high-temperature molten salt to drive the Stirling power generation device, a stable power generation output of the Stirling power generation device can be realized for 24 hours a day and under all climate conditions;

[0106] 4. The non-integrated external Stirling power generation device makes it possible to supplement power generation by heating the hot end with gas.

[0107] In the description of the present application, terms such as "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0108] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0109] Those skilled in the art should understand that although the embodiments disclosed in the invention embodiments are as described above, the above content is only an embodiment adopted for the convenience of understanding the present invention and is not used to limit the embodiments of the present invention. Any person skilled in the art in the field to which the present invention embodiments belong can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention embodiments shall still be subject to the scope defined by the appended claims.

Claims

1. A solar-thermal molten salt energy storage Stirling power generation system, characterized in that: It includes a solar-thermal molten salt energy storage device and a Stirling power generation device (7). The solar-thermal molten salt energy storage device includes a solar collector and a molten salt tank (4) which contains molten salt. The solar collector is connected to the molten salt tank (4) through a first molten salt pump. The Stirling power generation device (7) includes a hot end (5) and a cold end (8). The hot end (5) is connected to the solar collector and the molten salt tank (4). The molten salt tank (4) is connected to the hot end (5) of the Stirling power generation device (7) through a second molten salt pump. The cold end (8) is provided with a heat exchange device which exchanges heat through air or water. A burner (6) is provided on one side of the hot end (5) of the Stirling power generation device (7), and the burner (6) can heat the hot end (5) to provide heat for the hot end (5) of the Stirling power generation device. The power generation system includes a molten salt heat exchanger (9) which is connected to the molten salt tank (4). The Stirling power generation system is installed parallel to the thermal power unit power generation system, and part of the steam generated by the thermal power unit is pumped to the molten salt heat exchanger (9) and transfers its heat to the molten salt in the molten salt heat exchanger (9).

2. The molten salt thermal energy storage Stirling power generation system according to claim 1, characterized in that: The molten salt tank (4) of the power generation system is connected to multiple solar collectors, and the molten salt tank (4) can store the heat collected by the multiple solar collectors connected thereto.

3. The solar thermal molten salt energy storage Stirling power generation system according to claim 1, wherein: The molten salt in the molten salt tank (4) can convert water into steam or hot water for external heat supply through the molten salt heat exchanger (9).

4. A method for generating electricity by using a solar-thermal molten salt energy storage Stirling engine, which is executed by the solar-thermal molten salt energy storage Stirling power generation system described in claim 1 or 3, and is characterized in that: The power generation method includes the following steps: S1: Liquefy the molten salt in the molten salt tank; S2: Judge whether there is sunlight; if yes, execute step S3; if no, execute step S4; S3: Start the photo-thermal molten salt energy storage device, and the Stirling power generation device driven by molten salt generates electricity; S4: Judge whether the heat storage amount and molten salt temperature in the molten salt tank can drive the Stirling power generation device; if yes, execute step S5; if no, the Stirling power generation device does not generate electricity; S5: Start the Stirling power generation device driven by molten salt to generate electricity.

5. The method for generating electricity by a solar-thermal molten salt energy storage Stirling engine according to claim 4, wherein: Step S3 includes the following steps: S31: Start the solar-thermal molten salt energy storage device; S32: The solar collector heats the molten salt to raise its temperature; S33: Send the heated molten salt to the hot end of the external Stirling power generation device, and the corresponding Stirling power generation device generates electricity.

6. A method for generating electricity by means of a solar-thermal molten salt energy storage Stirling engine, which is implemented by the solar-thermal molten salt energy storage Stirling engine power generation system described in claim 3, and is characterized in that: The power generation method includes the following steps: S3: Start the solar-thermal molten salt energy storage device, and the Stirling power generation device driven by molten salt generates electricity; S4: Judge whether the heat storage amount and molten salt temperature in the molten salt tank can drive the Stirling power generation device; if yes, execute step S5; if no, execute step S6; S5: Start the Stirling power generation device driven by molten salt to generate electricity; S6: Start the burner to heat the hot end, raise the temperature of the molten salt in the hot end, and the high-temperature molten salt drives the Stirling power generation device to generate electricity.

7. The method for generating electricity by means of a solar-thermal molten salt energy storage Stirling engine according to claim 6, wherein: Step S3 includes the following steps: S31: Start the solar-thermal molten salt energy storage device; S32: The solar collector heats the molten salt to raise its temperature; S33: Send the heated molten salt to the hot end of the external Stirling power generation device, and the corresponding Stirling power generation device generates electricity.

Images