A molten salt coupled supercritical carbon dioxide power generation system suitable for a new energy base and an operation method thereof

Abstract

The application discloses a molten salt coupled supercritical carbon dioxide power generation system suitable for a new energy base and an operation method thereof, which comprises a main compressor and an electric heater; the outlet of the main compressor is connected with the cold side inlet of a low-temperature regenerator, the cold side outlet of the low-temperature regenerator is connected with the cold side inlet of a high-temperature regenerator, and the cold side outlet of the high-temperature regenerator is connected with the cold side inlet of a molten salt carbon dioxide heat exchanger; the cold side outlet of the high-temperature regenerator is connected with the cold side inlet of the molten salt carbon dioxide heat exchanger through the electric heater; the cold side outlet of the molten salt carbon dioxide heat exchanger is connected with the inlet of a turbine, and the cold side outlet of the molten salt carbon dioxide heat exchanger is connected with the outlet of the turbine. The system utilizes the electric heating carbon dioxide working medium, can preheat the molten salt carbon dioxide heat exchanger in the initial cold start period, can prevent the molten salt from solidifying in any operation stage, and improves the safety of the molten salt coupled supercritical carbon dioxide power generation operation. The system of the application can provide energy storage and rotational inertia for the new energy base, has simple structure, and is convenient to operate and maintain.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of comprehensive energy, and particularly relates to a molten salt coupled supercritical carbon dioxide power generation system suitable for a new energy base and an operation method. BACKGROUND

[0002] With the rapid increase of new energy grid-connected capacity, the demand for energy storage peak shaving of the power grid is more urgent. At present, new energy storage develops rapidly and has many technical routes, such as compressed air energy storage, electrochemical energy storage, thermochemical energy storage, thermal energy storage, flywheel energy storage and gravity energy storage. Electrochemical energy storage is difficult to be applied on a large scale at present due to safety and environmental protection requirements; thermochemical energy storage and gravity energy storage technology are not mature; flywheel energy storage is limited by cost and energy storage capacity, and is currently only applied in the field of thermal power frequency modulation; compressed air energy storage has developed rapidly in recent years and the technology is relatively mature, but the site selection of the gas storage is greatly affected by the address conditions; thermal energy storage technology is mature, safe and low in cost, but the energy storage density is low and can be applied to thermal power unit frequency modulation.

[0003] Molten salt energy storage is a technology that converts chemical energy into heat energy, and then into electrical energy. The basic principle is to heat molten salt to a high temperature state (usually between 200°C and 600°C), storing chemical energy. When electrical energy is needed, the high-temperature molten salt transfers heat to a working fluid (such as water or steam) through a heat exchanger, which is heated and drives a turbine to generate electricity, thereby converting heat energy into electrical energy.

[0004] The power generation system of critical carbon dioxide (also known as supercritical carbon dioxide, S-CO2) is a high-efficiency and environmentally friendly power generation technology, with advantages of high thermal-to-electric conversion efficiency, small system volume, and good flexibility. Here is an introduction to the supercritical carbon dioxide power generation system:

[0005] I. Characteristics of supercritical carbon dioxide

[0006] Supercritical carbon dioxide refers to the state of carbon dioxide where both temperature and pressure reach or exceed its critical point. In this state, the physical properties of carbon dioxide are between those of a gas and a liquid, combining the high flowability of a gas with the high density of a liquid, making it an ideal heat cycle working fluid.

[0007] II. Principle of supercritical carbon dioxide power generation system

[0008] The supercritical carbon dioxide power generation system is mainly based on the Brayton cycle, which is a thermodynamic cycle using gas as the working medium. In the system, supercritical carbon dioxide is used as the working medium, and through processes such as compression, heating, expansion and cooling, the conversion between heat energy and mechanical energy is realized.

[0009] Supercritical carbon dioxide power generation system, as one of the hot research directions of future clean and efficient power generation technology and energy comprehensive utilization technology, has broad application prospects. It can not only be applied to the replacement and upgrading of traditional energy fields such as thermal power generation and nuclear power, but also be applied to the utilization of renewable energy such as solar energy and wind energy, and energy storage. With the continuous development and improvement of technology, supercritical carbon dioxide power generation system will play an increasingly important role in the global energy structure.

[0010] Molten salt energy storage has the characteristics of large capacity, low cost, long service life, etc., and can be flexibly coupled with thermal power generation systems, such as molten salt coupled with steam Rankine cycle and supercritical carbon dioxide Brayton cycle.

[0011] The configuration of molten salt thermal storage devices in new energy bases is an important technical direction, which helps to improve energy utilization efficiency, balance power supply, alleviate system fluctuations, and provide strong support for the sustainable development of new energy bases. The application advantages of molten salt thermal storage devices in new energy bases are as follows:

[0012] Provide heat energy: Molten salt thermal storage devices can efficiently store and release heat energy, providing stable heat sources for new energy bases to meet heating needs.

[0013] Adapt to traditional power generation technology: The working principle of molten salt thermal storage devices is similar to that of thermal power systems, which can easily integrate into existing power systems, improving system flexibility and stability.

[0014] Balance power supply: By storing and releasing heat energy, molten salt thermal storage devices can balance power supply and alleviate the volatility and intermittency of new energy power generation.

[0015] Improve energy utilization rate: Molten salt thermal storage devices can achieve temporal and spatial translation of energy, storing excess energy and releasing it when needed, thereby improving energy utilization rate.

[0016] The configuration of molten salt thermal storage devices in new energy bases can promote new energy consumption and improve the safety of power grid operation. Molten salt coupled with supercritical carbon dioxide Brayton cycle has the advantages of simple system structure, high power generation efficiency, and water resource conservation, and has broad application prospects. To adapt to the changes in new energy output, molten salt thermal power plants configured in new energy bases need to operate frequently under varying loads and conditions, and even need to be started and stopped daily. However, the working temperature range of molten salt is generally 290-565℃, and during the cold start phase of supercritical carbon dioxide cycle power generation units, the temperature mismatch between molten salt heat release and carbon dioxide heat absorption will cause excessive heat release of molten salt, even condensation, blocking of pipelines and equipment, and shutdown.

[0017] Therefore, a system capable of coordinating the heat release of molten salt and the heat absorption of carbon dioxide is urgently needed to ensure the normal operation of the molten salt coupled supercritical carbon dioxide power generation system under variable working conditions. SUMMARY

[0018] In order to overcome the problems of excessive heat release of molten salt, even condensation, and blockage of pipelines and equipment in the prior art, the purpose of the present application is to provide a molten salt coupled supercritical carbon dioxide power generation system suitable for new energy bases, which can preheat the molten salt carbon dioxide heat exchanger and the associated pipelines during the initial cold start, avoid blockage of pipelines and equipment, ensure the normal operation of the molten salt coupled supercritical carbon dioxide power generation system under variable working conditions, and be suitable for supporting photovoltaic and wind power new energy bases.

[0019] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0020] A molten salt coupled supercritical carbon dioxide power generation system suitable for new energy bases, comprising a main compressor, a low-temperature regenerator, a high-temperature regenerator, an electric heater, a molten salt carbon dioxide heat exchanger, a turbine bypass regulating valve, a turbine, and a pre-cooler.

[0021] The outlet of the main compressor is connected to the cold side inlet of the low-temperature regenerator, the cold side outlet of the low-temperature regenerator is connected to the cold side inlet of the high-temperature regenerator, and the cold side outlet of the high-temperature regenerator is connected to the cold side inlet of the molten salt carbon dioxide heat exchanger.

[0022] The cold side outlet of the molten salt carbon dioxide heat exchanger is connected to the inlet of the turbine, and the cold side outlet of the molten salt carbon dioxide heat exchanger is connected to the outlet of the turbine through the turbine bypass regulating valve.

[0023] The further improvement of the present application is that it further comprises a re-compressor, and the hot side outlet of the low-temperature regenerator is also connected to the inlet of the re-compressor, and the outlet of the re-compressor is connected to the cold side inlet of the high-temperature regenerator.

[0024] The further improvement of the present application is that the cold side outlet of the high-temperature regenerator is connected to the cold side inlet of the molten salt carbon dioxide heat exchanger through a molten salt carbon dioxide heat exchanger inlet pipeline shut-off valve.

[0025] The further improvement of the present application is that the cold side outlet of the high-temperature regenerator is connected to the inlet of the electric heater through an electric heater inlet pipeline shut-off valve.

[0026] The further improvement of the present application is that the outlet of the electric heater is connected to the cold side inlet of the molten salt carbon dioxide heat exchanger through an electric heater outlet pipeline shut-off valve.

[0027] The further improvement of the present application is that the high-temperature molten salt tank and the low-temperature molten salt tank are further provided; the high-temperature molten salt tank is connected with the molten salt carbon dioxide heat exchanger hot side inlet through a molten salt pump and a molten salt flow regulating valve in sequence, and the molten salt carbon dioxide heat exchanger hot side outlet is connected with the low-temperature molten salt tank.

[0028] The further improvement of the present application is that the molten salt pump and the molten salt flow regulating valve are arranged between the high-temperature molten salt tank and the low-temperature molten salt tank.

[0029] The further improvement of the present application is that the electricity of the electric heater comes from the output of photovoltaic or wind power.

[0030] A running method of a molten salt coupled supercritical carbon dioxide power generation system suitable for a new energy base, comprising the following steps:

[0031] The low-temperature carbon dioxide working medium is pressurized by a main compressor, and then flows through a low-temperature regenerator and a high-temperature regenerator cold side in sequence, and then enters an electric heater to be heated, and the high-temperature carbon dioxide working medium after being heated enters a molten salt carbon dioxide heat exchanger working medium side, and the carbon dioxide working medium continues to flow through the high-temperature regenerator and the low-temperature regenerator hot side in sequence, and a part of the working medium at the low-temperature regenerator hot side outlet is pressurized and then merged into the high-temperature regenerator cold side inlet, and another part of the working medium at the low-temperature regenerator hot side outlet is cooled by a pre-cooler and then returns to the main compressor inlet.

[0032] When the temperature and pressure of the molten salt carbon dioxide heat exchanger working medium side outlet reach preset temperature and pressure, the turbine bypass regulating valve is gradually closed to a preset value, the turbine starts to rotate and runs at a constant speed to a set value, and the turbine generates power under load.

[0033] The further improvement of the present application is that when the salt side of the molten salt carbon dioxide heat exchanger reaches a preset temperature, the molten salt pump is operated, and the high-temperature molten salt in the high-temperature molten salt tank is transported to the molten salt carbon dioxide heat exchanger salt side to release heat, and the carbon dioxide working medium at the high-temperature regenerator cold side outlet enters the molten salt carbon dioxide heat exchanger working medium side to absorb the heat released by the high-temperature molten salt and continue to increase the temperature.

[0034] Compared with the prior art, the present application has the following beneficial technical effects:

[0035] In the present application, by arranging the electric heater and the molten salt carbon dioxide heat exchanger, the carbon dioxide working medium is heated by electricity, which not only can preheat the molten salt carbon dioxide heat exchanger in the initial cold start period to prevent the solidification of the molten salt, but also can prevent the solidification of the molten salt at any stage of operation, thereby improving the safety of the molten salt coupled supercritical carbon dioxide power generation operation.

[0036] Further, the electricity used for the electric heating can come from photovoltaic or wind power, and can provide energy storage and rotational inertia for a new energy base.

[0037] In the operation of the molten salt coupled supercritical carbon dioxide power generation system in the application, the low-temperature carbon dioxide working medium is pressurized by the main compressor, and then flows through the cold side of the low-temperature regenerator and the high-temperature regenerator in turn, and then enters the electric heater to be heated. The high-temperature carbon dioxide working medium after being heated enters the working medium side of the molten salt carbon dioxide heat exchanger. The carbon dioxide working medium continues to flow through the high-temperature regenerator and the low-temperature regenerator in turn after passing through the turbine bypass regulating valve. Part of the working medium at the outlet of the low-temperature regenerator hot side is pressurized and then merged into the inlet of the low-temperature regenerator cold side. Another part of the working medium at the outlet of the low-temperature regenerator hot side is cooled by the precooler and then returns to the inlet of the main compressor to complete the circulation process. In this process, the power of the electric heater is controlled to continuously heat the circulating carbon dioxide working medium, and the high-temperature carbon dioxide working medium after being heated is used to preheat the molten salt carbon dioxide heat exchanger. When the outlet temperature and pressure of the working medium side of the molten salt carbon dioxide heat exchanger reach the preset temperature and pressure, the turbine bypass regulating valve is gradually closed to the preset value, the turbine starts to rotate, and the speed is set to the set value, and the turbine generates power under load. After this stage, the molten salt coupled supercritical carbon dioxide power generation system normally generates power, and the power adjustment is realized by adjusting the molten salt flow and the circulation parameters.

[0038] Further, when the outlet temperature and pressure of the working medium side of the molten salt carbon dioxide heat exchanger reach the preset temperature and pressure, the turbine bypass regulating valve is gradually closed to the preset value, the turbine starts to rotate, and then the turbine bypass regulating valve is further closed until it is fully closed, the speed of the turbine is set to the set value, and then the turbine generates power under load. After this stage, the molten salt coupled supercritical carbon dioxide power generation system normally generates power, and the power adjustment is realized by adjusting the molten salt flow and the circulation parameters. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. The following drawings are used to provide further understanding of the application, and form a part of the application, and do not constitute a limitation of the application. In the drawings:

[0040] Figure 1 The figure is a schematic diagram of the molten salt coupled supercritical carbon dioxide power generation system of the application applied to a new energy base.

[0041] Among them, 1 is the main compressor; 2 is the low-temperature regenerator; 3 is the high-temperature regenerator; 4 is the shut-off valve of the inlet pipe of the molten salt carbon dioxide heat exchanger; 5 is the shut-off valve of the inlet pipe of the electric heater; 6 is the electric heater; 7 is the shut-off valve of the outlet pipe of the electric heater; 8 is the molten salt carbon dioxide heat exchanger; 9 is the turbine bypass regulating valve; 10 is the turbine; 11 is the precooler; 12 is the recompressor; 13 is the high-temperature molten salt tank; 14 is the molten salt pump; 15 is the molten salt flow regulating valve; and 16 is the low-temperature molten salt tank. Detailed Implementation

[0042] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0043] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0044] like Figure 1 As shown, the present invention provides a molten salt coupled supercritical carbon dioxide power generation system suitable for new energy bases, including a main compressor 1, a low-temperature regenerator 2, a high-temperature regenerator 3, a molten salt carbon dioxide heat exchanger inlet pipe shut-off valve 4, an electric heater inlet pipe shut-off valve 5, an electric heater 6, an electric heater outlet pipe shut-off valve 7, and a molten salt carbon dioxide heat exchanger 8.

[0045] The main compressor 1 outlet is connected to the cold side inlet of the low-temperature regenerator 2, the cold side outlet of the low-temperature regenerator 2 is connected to the cold side inlet of the high-temperature regenerator 3, and the cold side outlet of the high-temperature regenerator 3 is connected to the cold side inlet of the molten salt carbon dioxide heat exchanger 8 via the shut-off valve 4 of the molten salt carbon dioxide heat exchanger inlet pipeline. At the same time, the cold side outlet of the high-temperature regenerator 3 is connected to the inlet of the electric heater 6 via the shut-off valve 5 of the electric heater inlet pipeline, and the outlet of the electric heater 6 is connected to the cold side inlet of the molten salt carbon dioxide heat exchanger 8 via the shut-off valve 7 of the electric heater outlet pipeline.

[0046] The embodiment of the present application provides a molten salt coupled supercritical carbon dioxide power generation system suitable for a new energy base, and further comprises a turbine bypass regulating valve 9, a turbine 10, a precooler 11 and a re-compressor 12; the cold side outlet of the molten salt carbon dioxide heat exchanger 8 is connected with the inlet of the turbine 10, and meanwhile, the cold side outlet of the molten salt carbon dioxide heat exchanger 8 is connected with the outlet of the turbine 10 through the turbine bypass regulating valve 9; the outlet of the turbine 10 is connected with the hot side inlet of the high-temperature regenerator 3, the hot side outlet of the high-temperature regenerator 3 is connected with the hot side inlet of the low-temperature regenerator 2, the hot side outlet of the low-temperature regenerator 2 is connected with the hot side inlet of the precooler 11 and the inlet of the re-compressor 12 respectively, the outlet of the re-compressor 12 is connected with the cold side inlet of the high-temperature regenerator 3, and the hot side outlet of the precooler 11 is connected with the inlet of the main compressor 1.

[0047] The embodiment of the present application provides a molten salt coupled supercritical carbon dioxide power generation system suitable for a new energy base, and further comprises a high-temperature molten salt tank 13, a molten salt pump 14, a molten salt flow regulating valve 15 and a low-temperature molten salt tank 16; the high-temperature molten salt tank 13 is connected with the hot side inlet of the molten salt carbon dioxide heat exchanger 8 through the molten salt pump 14 and the molten salt flow regulating valve 15 in sequence, and the hot side outlet of the molten salt carbon dioxide heat exchanger 8 is connected with the low-temperature molten salt tank 16.

[0048] As a preferred embodiment of the present application, the electric heater 6 uses electricity from photovoltaic or wind power output.

[0049] The operation method of the molten salt coupled supercritical carbon dioxide power generation system suitable for a new energy base as described above comprises the following steps:

[0050] In the initial stage of cold start, the molten salt pump 14 does not operate, the molten salt flow regulating valve 15 is in a closed state, meanwhile, the molten salt carbon dioxide heat exchanger inlet pipeline shutoff valve 4 is closed, the electric heater inlet pipeline shutoff valve 5 and the outlet pipeline shutoff valve 7 are opened, and the electric heater 6 is started.

[0051] The working process of the supercritical carbon dioxide cycle is as follows: the low-temperature carbon dioxide working medium is pressurized by the main compressor 1, then flows through the low-temperature regenerator 2 and the high-temperature regenerator 3 cold side in sequence, and then enters the electric heater 6 to be heated; the high-temperature carbon dioxide working medium after being heated enters the molten salt carbon dioxide heat exchanger 8 working medium side; the working medium flows through the high-temperature regenerator 3 and the low-temperature regenerator 2 hot side in sequence after passing through the turbine bypass regulating valve 9; part of the working medium at the low-temperature regenerator 2 hot side outlet is pressurized by the re-compressor 12, then flows into the high-temperature regenerator 3 cold side inlet; another part of the working medium at the low-temperature regenerator 2 hot side outlet is cooled by the precooler 11, and then returns to the main compressor 1 inlet, completing the cycle process. In this process, the power of the electric heater 6 is controlled to continuously heat the circulating carbon dioxide working medium, and the high-temperature carbon dioxide working medium after being heated is used to preheat the molten salt carbon dioxide heat exchanger 8 and its auxiliary pipelines.

[0052] When the salt side of the molten salt carbon dioxide heat exchanger 8 reaches the preset temperature, the molten salt pump 14 is operated, the molten salt flow regulating valve 15 is opened, the molten salt carbon dioxide heat exchanger inlet pipeline shut-off valve 4 is opened, at the same time, the electric heater inlet pipeline shut-off valve 5 and the outlet pipeline shut-off valve 7 are closed, and the electric heater 6 is stopped; at this time, the high-temperature molten salt in the high-temperature molten salt tank 13 is transported to the salt side of the molten salt carbon dioxide heat exchanger 8 through the molten salt pump 14 and the molten salt flow regulating valve 15 to release heat, and the molten salt after heat release enters the low-temperature molten salt tank 16; the carbon dioxide working medium at the cold side outlet of the high-temperature regenerator 3 passes through the molten salt carbon dioxide heat exchanger inlet pipeline shut-off valve 4, enters the working medium side of the molten salt carbon dioxide heat exchanger 8, absorbs the heat released by the high-temperature molten salt, and continues to increase the temperature; in this stage, the other processes of the supercritical carbon dioxide cycle are the same as those in the initial cold start.

[0053] When the outlet temperature and pressure of the working medium side of the molten salt carbon dioxide heat exchanger 8 reach the preset temperature and pressure, the turbine bypass regulating valve 9 is gradually closed to the preset value, the turbine 10 starts to rotate, then the turbine bypass regulating valve 9 is further closed, and the turbine 10 is operated at a constant speed until the turbine 10 generates power. After this stage, the molten salt coupled supercritical carbon dioxide power generation system is normally operated, and the power generation power is adjusted by adjusting the molten salt flow and the cycle parameters.

[0054] The electrically heated carbon dioxide working medium can be put into use in the initial cold start, and the hot carbon dioxide working medium after electric heating flows through the molten salt carbon dioxide heat exchanger 8, so as to preheat the molten salt carbon dioxide heat exchanger 8 and the associated pipeline valves, thereby avoiding the risk of excessive heat release and molten salt condensation caused by the low temperature of the molten salt carbon dioxide heat exchanger 8 metal pipe wall in the initial heat release stage of the molten salt carbon dioxide heat exchanger 8, that is, the molten salt carbon dioxide heat exchanger 8 can also be put into use in any operating condition of the system to prevent the solidification of the molten salt.

[0055] In the present application, by arranging the electric heater and the molten salt carbon dioxide heat exchanger, the electrically heated carbon dioxide working medium can not only preheat the molten salt system in the initial cold start to prevent the solidification of the molten salt, but also prevent the solidification of the molten salt in any operating stage, thereby improving the safety of the molten salt coupled supercritical carbon dioxide power generation operation. Moreover, the system structure is simple, and the operation and maintenance are convenient.

[0056] The above only describes the best embodiment of the present application, but cannot be understood as a limitation on the claims. The present application is not limited to the above embodiment, and the specific structure allows changes. Any changes made within the protection scope of the independent claims of the present application are within the protection scope of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

Claims

1. An operation method for a molten salt coupled supercritical carbon dioxide power generation system suitable for new energy bases, characterized in that, The method is based on a molten salt coupled supercritical carbon dioxide power generation system applicable to new energy bases. The system includes a main compressor (1), a low-temperature regenerator (2), a high-temperature regenerator (3), an electric heater (6), a molten salt carbon dioxide heat exchanger (8), a turbine bypass regulating valve (9), a turbine (10), and a precooler (11). Among them, the outlet of the main compressor (1) is connected to the cold side inlet of the low temperature regenerator (2), the cold side outlet of the low temperature regenerator (2) is connected to the cold side inlet of the high temperature regenerator (3), the cold side outlet of the high temperature regenerator (3) is connected to the cold side inlet of the molten salt carbon dioxide heat exchanger (8); the cold side outlet of the high temperature regenerator (3) is connected to the inlet of the electric heater (6), and the outlet of the electric heater (6) is connected to the cold side inlet of the molten salt carbon dioxide heat exchanger (8); The cold side outlet of the molten salt carbon dioxide heat exchanger (8) is connected to the inlet of the turbine (10). The cold side outlet of the molten salt carbon dioxide heat exchanger (8) is connected to the outlet of the turbine (10) via the turbine bypass regulating valve (9). The outlet of the turbine (10) is connected to the hot side inlet of the high temperature regenerator (3). The hot side outlet of the high temperature regenerator (3) is connected to the hot side inlet of the low temperature regenerator (2). The hot side outlet of the low temperature regenerator (2) is connected to the hot side inlet of the precooler (11). The hot side outlet of the precooler (11) is connected to the inlet of the main compressor (1). The method includes the following steps: After being pressurized by the main compressor (1), the low-temperature carbon dioxide working medium flows through the cold side of the low-temperature regenerator (2) and the high-temperature regenerator (3) in sequence, and then enters the electric heater (6) to be heated. The heated high-temperature carbon dioxide working medium enters the working medium side of the molten salt carbon dioxide heat exchanger (8). After passing through the turbine bypass regulating valve (9), the carbon dioxide working medium flows through the hot side of the high-temperature regenerator (3) and the low-temperature regenerator (2) in sequence. After being pressurized, a part of the working medium at the hot side outlet of the low-temperature regenerator (2) flows into the cold side inlet of the high-temperature regenerator (3). After the other part of the working medium at the hot side outlet of the low-temperature regenerator (2) releases heat through the precooler (11), it returns to the inlet of the main compressor (1). When the working fluid outlet temperature and pressure of the molten salt carbon dioxide heat exchanger (8) reach the preset temperature and pressure, the turbine bypass regulating valve (9) is gradually closed to the preset value, the turbine (10) starts to run and reaches the set speed, and the turbine (10) generates electricity under load.

2. The operation method of the molten salt coupled supercritical carbon dioxide power generation system applicable to new energy bases according to claim 1, characterized in that, When the salt side of the molten salt carbon dioxide heat exchanger (8) reaches the preset temperature, the molten salt pump (14) is run. The high-temperature molten salt in the high-temperature molten salt tank (13) is transported to the salt side of the molten salt carbon dioxide heat exchanger (8) through the molten salt pump (14) to release heat. The carbon dioxide working medium at the cold side outlet of the high-temperature regenerator (3) enters the working medium side of the molten salt carbon dioxide heat exchanger (8), absorbs the heat released by the high-temperature molten salt, and continues to increase the temperature.

3. The operation method of the molten salt coupled supercritical carbon dioxide power generation system applicable to new energy bases according to claim 1, characterized in that, It also includes a re-compressor (12), the hot side outlet of the low-temperature regenerator (2) is also connected to the inlet of the re-compressor (12), and the outlet of the re-compressor (12) is connected to the cold side inlet of the high-temperature regenerator (3).

4. The operation method of the molten salt coupled supercritical carbon dioxide power generation system applicable to new energy bases according to claim 1, characterized in that, The cold side outlet of the high temperature regenerator (3) is connected to the cold side inlet of the molten salt carbon dioxide heat exchanger (8) via the shut-off valve (4) of the inlet pipeline of the molten salt carbon dioxide heat exchanger.

5. The operation method of the molten salt coupled supercritical carbon dioxide power generation system applicable to new energy bases according to claim 1, characterized in that, The cold side outlet of the high temperature regenerator (3) is connected to the inlet of the electric heater (6) via the shut-off valve (5) of the electric heater inlet pipeline.

6. The operation method of the molten salt coupled supercritical carbon dioxide power generation system applicable to new energy bases according to claim 1, characterized in that, The outlet of the electric heater (6) is connected to the cold side inlet of the molten salt carbon dioxide heat exchanger (8) via the shut-off valve (7) of the electric heater outlet pipeline.

7. The operation method of the molten salt coupled supercritical carbon dioxide power generation system applicable to new energy bases according to claim 1, characterized in that, It also includes a high-temperature molten salt tank (13) and a low-temperature molten salt tank (16); the high-temperature molten salt tank (13) is connected to the hot side inlet of the molten salt carbon dioxide heat exchanger (8) via a molten salt pump (14) and a molten salt flow regulating valve (15), and the hot side outlet of the molten salt carbon dioxide heat exchanger (8) is connected to the low-temperature molten salt tank (16).

8. The operation method of the molten salt coupled supercritical carbon dioxide power generation system applicable to new energy bases according to claim 1, characterized in that, A molten salt pump (14) and a molten salt flow regulating valve (15) are provided between the high-temperature molten salt tank (13) and the low-temperature molten salt tank (16).

9. The operation method of the molten salt coupled supercritical carbon dioxide power generation system applicable to new energy bases according to claim 1, characterized in that, The electric heater (6) is powered by photovoltaic or wind power.

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