A method and device for storing and reusing heat from a high-temperature divertor of a fusion reactor

Abstract

The application discloses a fusion reactor high-temperature divertor heat source energy storage reheating method and device, belongs to the fusion reactor energy conversion technical field, and utilizes the high-temperature divertor heat source to carry out Rankine cycle reheating, and through a divertor side special high-temperature molten salt tank, pulse fluctuation is smoothed, full-cycle reheating parameter stability is ensured, and efficient and stable power generation is realized. The device comprises a fusion reactor heat source subsystem, an intermediate energy storage subsystem and a Rankine cycle power generation subsystem; the intermediate energy storage subsystem is provided with a low-temperature molten salt tank, a first high-temperature molten salt tank corresponding to a blanket and a second high-temperature molten salt tank corresponding to a divertor, and is respectively used for storing and releasing the blanket and divertor heat; the Rankine cycle power generation subsystem utilizes the blanket heat to generate main steam, and utilizes the divertor heat to reheat high-pressure cylinder exhaust steam. The application not only fully utilizes the high-temperature divertor heat source for reheating, but also can effectively adapt to the continuous power generation operation of the pulse type fusion reactor, and has the economic efficiency and engineering applicability.

Description

Technical Field

[0001] This invention belongs to the field of fusion reactor energy conversion technology, specifically relating to a method and apparatus for energy storage and reheating of a high-temperature divertor heat source in a fusion reactor. Background Technology

[0002] Tokamak devices are currently the mainstream devices for magnetic confinement nuclear fusion research. Due to the unique nature of fusion reactions, they contain multiple heat sources, such as the blanket and divertors, each with significant differences in temperature quality, requiring coordinated utilization. However, existing energy conversion schemes utilize divertors in a relatively simplistic way, making them difficult to adapt to the pulsed operation characteristics of fusion reactors.

[0003] In existing technologies, water cooling of divertors is a low-temperature heat source (around 200°C), typically used only for preheating feedwater in Rankine cycles. However, this method has significant limitations: parameters such as the temperature and flow rate of the feedwater at the condenser outlet and the operating temperature of the deaerator are constrained by the design conditions of the regenerative system, resulting in a limited enthalpy drop. When the divertor outlet temperature increases or the thermal power increases, the Rankine cycle cannot fully absorb the heat it carries, leading to energy waste. With the development of fusion reactor cooling technology, new solutions such as using lithium-lead or lead-bismuth working fluids to cool divertors have increased the divertor outlet temperature (above 500°C), allowing the divertor heat to be used in the reheat process. Because the reheat process allows for a larger temperature rise and absorbs more heat, it is more conducive to improving the cycle's thermal efficiency.

[0004] Constrained by plasma instabilities, current fusion reactors can only operate in long-pulse mode, resulting in significant pulse fluctuations in their thermal power output. To address this characteristic, existing technologies have proposed energy conversion schemes for fusion reactors equipped with intermediate energy storage, aiming to smooth pulsed power output and achieve continuous and stable power generation.

[0005] Existing technical solutions involving intermediate energy storage and divertor heat utilization mainly suffer from the following two limitations:

[0006] Category 1: Direct Preheating Mode. This mode does not consider the dynamic characteristics of the divertor's thermal power fluctuations with the fusion pulse. The heat fluctuations are directly transferred to the regenerator system, resulting in unstable feedwater temperature, which in turn affects the stability of the steam parameters at the steam generator outlet and reduces the overall plant thermal cycle efficiency.

[0007] The second type: Independent energy storage system mode. To mitigate divertor fluctuations, a large-scale energy storage device is configured separately for it. While this approach can alleviate fluctuation problems, it significantly increases system complexity and equipment investment, and fails to achieve deep coupling with the main cladding energy storage system, resulting in low integration.

[0008] In summary, existing technologies struggle to balance economic efficiency and stability, hindering the efficient and stable utilization of divertors. Therefore, overcoming the impact of high-temperature divertor pulse fluctuations on system stability and resolving the waste of heat energy and disturbances in feedwater parameters caused by elevated divertor outlet temperature in traditional preheating methods, thereby achieving efficient, stable matching and deep coupling between the divertor and the Rankine cycle system, are pressing technical challenges in this field. Summary of the Invention

[0009] To address the issues of wasted grade and pulse fluctuation disturbances affecting reheat parameters when using low-temperature heat from fusion reactor divertors for feedwater preheating, as well as the excessively high cost of independently configuring energy storage systems, this invention provides a method and apparatus for reheating energy from a high-temperature divertor heat source in fusion reactors. This method not only fully utilizes the high-temperature divertor heat source for reheating but also effectively adapts to the continuous power generation operation of pulsed fusion reactors, combining economic efficiency with engineering applicability.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A method for energy storage and reheating of a high-temperature divertor heat source in a fusion reactor includes: during the fusion reactor's operation, using the high-temperature heat from the divertor to heat molten salt, which is then stored in a second high-temperature molten salt tank dedicated to the divertor; during power generation, using the high-temperature molten salt stored in the second high-temperature molten salt tank for the reheat process of the Rankine cycle, thereby heating the exhaust steam from the high-pressure cylinder and improving the cycle's thermal efficiency; simultaneously, a second energy storage heat exchanger, a reheater, and a low-temperature molten salt tank are installed to smooth out thermal power fluctuations caused by the fusion reactor's pulsed operation, ensuring continuous and stable power generation even during the fusion reactor's intermittent operation; the blanket and divertor share a low-temperature molten salt tank, and are respectively equipped with independent first and second high-temperature molten salt tanks, forming an asymmetric energy storage structure. The high-temperature heat source from the divertor is used for Rankine cycle reheating, and the second high-temperature molten salt tank of the divertor smooths out pulse fluctuations, ensuring stable reheat parameters throughout the entire cycle and achieving efficient and stable power generation.

[0012] To achieve the above method, the present invention also provides a fusion reactor high-temperature divertor heat source energy storage and reheat device, comprising a fusion reactor heat source subsystem, an intermediate energy storage subsystem, and a Rankine cycle power generation system; the fusion reactor heat source subsystem includes a blanket and a divertor, the intermediate energy storage subsystem includes a cryogenic molten salt tank, a first high-temperature molten salt tank corresponding to the blanket, a second high-temperature molten salt tank corresponding to the divertor, a first energy storage heat exchanger, and a second energy storage heat exchanger; the outlet of the blanket is connected to the hot-side inlet of the first energy storage heat exchanger, and the inlet of the blanket is connected to the hot-side outlet of the first energy storage heat exchanger; the outlet of the divertor is connected to the hot-side inlet of the second energy storage heat exchanger, and the inlet of the divertor is connected to the hot-side outlet of the second energy storage heat exchanger. The molten salt outlet of the first high-temperature molten salt tank is connected to the hot-side inlet of the steam generator in the Rankine cycle power generation system via the first high-temperature molten salt pump. The hot-side outlet of the steam generator is connected to the inlet of the low-temperature molten salt tank via a three-way valve. The molten salt outlet of the second high-temperature molten salt tank is connected to the hot-side inlet of the reheater in the Rankine cycle power generation system via the second high-temperature molten salt pump. The hot-side outlet of the reheater is connected to the inlet of the low-temperature molten salt tank via the three-way valve. The steam inlet of the turbine in the Rankine cycle power generation system is connected to the steam outlet of the steam generator. The steam outlet of the turbine is connected to the steam inlet of the condenser. The water outlet of the condenser is connected to the water inlet of the steam generator via a feedwater pump.

[0013] Furthermore, during operation, a portion of the molten salt from the first high-temperature molten salt pump is further heated by the divertor in the second energy storage heat exchanger before entering the second high-temperature molten salt tank. This results in the second high-temperature molten salt tank having a higher temperature than the first high-temperature molten salt tank, achieving cascaded storage and reheating of high-temperature molten salt from the divertor. Nitrate, carbonate eutectic, or fluoride molten salt systems are selected based on the divertor outlet temperature, and the low-temperature molten salt tank is actively temperature-traced. During mode switching, valves and pump units are opened and closed sequentially to ensure a smooth transition.

[0014] Beneficial effects:

[0015] 1. This invention utilizes the high-temperature heat from the divertor for reheating in the Rankine cycle after energy storage. It takes advantage of the large temperature rise and high heat absorption during reheating to avoid high quality being underutilized. Furthermore, it uses a high-temperature storage tank to smooth out pulse fluctuations and improve cycle efficiency.

[0016] 2. This invention adopts an asymmetric energy storage structure that superimposes two dedicated high-temperature molten salt tanks (divertor and cladding) onto a shared low-temperature molten salt tank. Compared with independent energy storage schemes, this significantly reduces investment and land occupation, effectively ensures stable reheat parameters throughout the entire cycle, and enables continuous power generation during intermittent periods. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a fusion reactor high-temperature divertor heat source energy storage and reheat device according to the present invention.

[0018] The attached figures are labeled as follows: 1-cladding; 2-divertor; 3-low-temperature molten salt tank; 4-first high-temperature molten salt tank; 5-second high-temperature molten salt tank; 6-first energy storage heat exchanger; 7-steam generator; 8-second energy storage heat exchanger; 9-reheater; 10-condenser; 11-high-pressure cylinder; 12-medium-pressure cylinder; 13-low-pressure cylinder; 14-generator; 15-first circulating working fluid pump; 16-low-temperature molten salt pump; 17-first high-temperature molten salt pump; 18-second circulating working fluid pump; 19-second high-temperature molten salt pump; 20-feed water pump; 21-first isolation valve; 22-second isolation valve; 23-reheat valve; 24-third isolation valve; 25-three-way valve. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0020] like Figure 1 As shown, the fusion reactor high-temperature divertor heat source energy storage and reheat device of this embodiment consists of a fusion reactor heat source subsystem, an intermediate energy storage subsystem, and a Rankine cycle power generation system.

[0021] The fusion reactor heat source includes a blanket 1 and a divertor 2. The two employ different cooling media loops and operate in different temperature ranges.

[0022] The intermediate energy storage subsystem includes a blanket energy storage system and a divertor energy storage system. The blanket energy storage system includes a first energy storage heat exchanger 6, a second isolation valve 22, a first high-temperature molten salt tank 4, a first high-temperature molten salt pump 17, a steam generator 7, a three-way valve 25, a low-temperature molten salt tank 3, and a low-temperature molten salt pump 16. The divertor energy storage system includes a second energy storage heat exchanger 8, a second high-temperature molten salt tank 5, a second high-temperature molten salt pump 19, a reheater 9, a three-way valve 25, and a low-temperature molten salt tank 3.

[0023] The Rankine cycle power generation system includes a steam generator 7, a high-pressure cylinder 11, a medium-pressure cylinder 12, a low-pressure cylinder 13, a generator 14, a reheater 9, a condenser 10, and a feedwater pump 20.

[0024] The outlet of cladding 1 is connected to the hot-side inlet of the first energy storage heat exchanger 6 via the first isolation valve 21. The hot-side outlet of the first energy storage heat exchanger 6 is connected to the inlet of the first circulating working fluid pump 15. The outlet of the first circulating working fluid pump 15 is connected back to the inlet of cladding 1, forming a closed-loop circulation circuit for the cladding cooling working fluid. The outlet of divertor 2 is connected to the hot-side inlet of the second energy storage heat exchanger 8 via the third isolation valve 24. The hot-side outlet of the second energy storage heat exchanger 8 is connected to the inlet of the second circulating working fluid pump 18. The outlet of the second circulating working fluid pump 18 is connected back to the inlet of divertor 2, forming a closed-loop circulation circuit for the divertor cooling working fluid.

[0025] The outlet of the cryogenic molten salt tank 3 is connected to the inlet of the cryogenic molten salt pump 16. The outlet of the cryogenic molten salt pump 16 is connected to the cold-side inlet of the first energy storage heat exchanger 6. The cold-side outlet of the first energy storage heat exchanger 6 is connected to the inlet of the first high-temperature molten salt tank 4 via the second isolation valve 22. The outlet of the first high-temperature molten salt tank 4 is connected to the inlet of the first high-temperature molten salt pump 17. The outlet of the first high-temperature molten salt pump 17 is divided into two paths: one path leads to the hot-side inlet of the steam generator 7, and the hot-side outlet of the steam generator 7 is connected to the first inlet of the three-way valve 25. The outlet of the three-way valve 25 is connected back to the cryogenic molten salt tank 3. The other path is connected to the cold-side inlet of the second energy storage heat exchanger 8 via the reheat valve 23. The cold-side outlet of the second energy storage heat exchanger 8 leads to the inlet of the second high-temperature molten salt tank 5. The outlet of the second high-temperature molten salt tank 5 is connected to the inlet of the second high-temperature molten salt pump 19. The outlet of the second high-temperature molten salt pump 19 is connected to the hot-side inlet of the reheater 9. The hot-side outlet of the reheater 9 is connected to the second inlet of the three-way valve 25, thereby connecting to the cryogenic molten salt tank 3.

[0026] Superheated steam is output from the cold side outlet of steam generator 7 and enters high-pressure cylinder 11 for expansion and work. The exhaust outlet of high-pressure cylinder 11 is connected to the cold side inlet of reheater 9, and the cold side outlet of reheater 9 is connected to the inlet of intermediate-pressure cylinder 12. The reheated steam expands and performs work in sequence through intermediate-pressure cylinder 12 and low-pressure cylinder 13 before entering condenser 10 for condensation. The condensate is pressurized by feedwater pump 20 and returns to the cold side inlet of steam generator 7, completing the thermodynamic cycle. High-pressure cylinder 11, intermediate-pressure cylinder 12, and low-pressure cylinder 13 coaxially drive generator 14 to generate electricity.

[0027] Preferably, the entire system in this invention uses the same molten salt to adapt to the complete operating temperature range from the low-temperature molten salt tank 3 to the second high-temperature molten salt tank 5. Depending on the actual outlet temperature of the fusion reactor divertor, molten salt systems with different temperature ranges can be selected.

[0028] (1) Nitrate system (suitable for divertor outlet temperature ≤ 540℃): For example, binary nitrate (Solar Salt, 40% NaNO3-60% KNO3, melting point about 220℃, decomposition point about 600℃) or ternary nitrate (Hitec, 53% KNO3-40% NaNO2-7% NaNO3, melting point about 142℃, decomposition point about 540℃) can be used. This system is low in cost and has mature engineering experience. The working temperature of the low-temperature molten salt tank 3 is 250~400℃, the working temperature of the first high-temperature molten salt tank 4 is 450~520℃, and the working temperature of the second high-temperature molten salt tank 5 is 500~540℃ (not exceeding the decomposition point).

[0029] (2) Carbonate or fluoride systems (suitable for divertor outlet temperatures > 540°C, up to 700°C): When advanced solutions such as SCO2 cooling are used to significantly increase the outlet temperature of the divertor, molten salts with higher temperature resistance must be selected. For example, carbonate eutectic systems (such as Na2CO3-K2CO3, melting point approximately 710°C, thermal stability better than 850°C) or fluoride molten salts (such as LiF-NaF-KF eutectic FLiNaK, melting point approximately 454°C, thermal stability better than 1000°C) can be used. It should be noted that these molten salts have high freezing points (especially carbonates at approximately 710°C). When using them, the low-temperature molten salt tank 3 needs to be actively heated to maintain it above the melting point (such as 750°C). In this case, "low-temperature molten salt tank" is a relative concept, and the actual operating temperature is much higher than that of the nitrate solution.

[0030] Those skilled in the art can select the appropriate type of molten salt based on the actual outlet temperature of the divertor, economic considerations, and engineering feasibility. This invention does not limit the specific molten salt, but requires that the selected molten salt have a freezing point lower than the system's minimum operating temperature and a decomposition point higher than the system's maximum operating temperature.

[0031] Based on the above system, this invention provides a fusion reactor molten salt energy storage and Rankine cycle reheating method for divertor heat source, comprising: during fusion reactor operation, heating molten salt using the high-temperature heat of the divertor and storing it in a dedicated high-temperature molten salt tank for the divertor; during power generation, using the high-temperature molten salt stored in the dedicated high-temperature molten salt tank for the Rankine cycle reheat process, i.e., heating the exhaust steam from the high-pressure cylinder, thereby improving cycle thermal efficiency. Simultaneously, through the buffering effect of the energy storage system, the thermal power fluctuations caused by fusion reactor pulse operation are smoothed out, ensuring continuous and stable power generation relying on stored heat even during fusion reactor intermittent operation. This invention employs an asymmetric energy storage structure where the blanket and divertor share a low-temperature molten salt tank, but each is equipped with an independent high-temperature molten salt tank, achieving a balance between investment economy and operational stability.

[0032] During fusion reactor operation, blanket 1 and divertor 2 operate simultaneously. Blanket 1 transfers heat from the cryogenic molten salt tank 3 to the molten salt via the first energy storage heat exchanger 6, raising its temperature before it enters the first high-temperature molten salt tank 4 for storage. Simultaneously, a portion of the molten salt in the first high-temperature molten salt tank 4 is extracted by the first high-temperature molten salt pump 17. One path leads to the steam generator 7 to generate main steam, while the other path leads to the second energy storage heat exchanger 8 via the reheat valve 23, where it is further heated by the heat from the divertor 2 before entering the second high-temperature molten salt tank 5, resulting in a higher temperature in the second high-temperature molten salt tank 5 compared to the first high-temperature molten salt tank 4. The molten salt in the second high-temperature molten salt tank 5 is then pumped by the second high-temperature molten salt pump 19 into the reheater 9 to heat the exhaust steam from the high-pressure cylinder 11. After the main steam performs work in the high-pressure cylinder 11, the exhaust steam is heated by the reheater 9 and then sequentially enters the intermediate-pressure cylinder 12 and the low-pressure cylinder 13 to continue performing work. Finally, the exhaust steam condenses and returns to the steam generator 7, completing the Rankine cycle.

[0033] During the fusion reactor intermittent operation, blanket 1 and divertor 2 cease operation, and the corresponding isolation valves are closed, disconnecting the blanket cooling circuit and divertor cooling circuit from the system. At this time, only the high-temperature molten salt stored in the first high-temperature molten salt tank 4 releases heat to the steam generator 7 to generate main steam, while the high-temperature molten salt stored in the second high-temperature molten salt tank 5 releases heat to the reheat valve 23 to heat the exhaust steam from the high-pressure cylinder 11. After releasing heat, the two molten salt streams converge and return to the low-temperature molten salt tank 3, thus maintaining continuous and stable power generation of the Rankine cycle during the intermittent period.

[0034] Specifically, in conjunction with the fusion reactor high-temperature divertor heat source energy storage and reheat device of the present invention, the fusion reactor molten salt energy storage and divertor heat source Rankine cycle reheat method of the present invention has two operating modes, which are achieved by switching through valve groups:

[0035] a. Fusion reactor operation mode:

[0036] Open the first isolation valve 21, the second isolation valve 22, the third isolation valve 24, and the reheat valve 23. Start the first circulating working fluid pump 15, the second circulating working fluid pump 18, the cryogenic molten salt pump 16, the first high-temperature molten salt pump 17, the second high-temperature molten salt pump 19, and the feed water pump 20.

[0037] At this time, the cladding 1 transfers heat to the low-temperature molten salt through the first energy storage heat exchanger 6. After the molten salt is heated, it enters the first high-temperature molten salt tank 4 for partial storage, and the other part is split after passing through the first high-temperature molten salt pump 17: one part enters the steam generator 7 to generate superheated steam, and after releasing heat, it returns to the low-temperature molten salt tank 3 through the three-way valve 25; the other part passes through the reheat valve 23, and is further heated by the heat from the divertor 2 in the second energy storage heat exchanger 8 before entering the second high-temperature molten salt tank 5, where part is stored and part enters the reheater 9 to heat the high-pressure cylinder exhaust steam. After cooling, it returns to the low-temperature molten salt tank 3 through the three-way valve 25.

[0038] Superheated steam from the outlet of steam generator 7 expands and performs work in high-pressure cylinder 11. The exhaust steam from high-pressure cylinder enters reheater 9, is heated, and then sequentially enters intermediate-pressure cylinder 12 and low-pressure cylinder 13 to continue performing work. The exhaust steam condenses and returns to steam generator 7.

[0039] b. Fusion reactor off-peak mode:

[0040] Close the first isolation valve 21, the second isolation valve 22, the third isolation valve 24, and the reheat valve 23; stop the cryogenic molten salt pump 16, the first circulating working fluid pump 15, and the second circulating working fluid pump 18.

[0041] The high-temperature molten salt stored in the first high-temperature molten salt tank 4 enters the steam generator 7 to generate superheated steam, while the high-temperature molten salt stored in the second high-temperature molten salt tank 5 enters the reheater 9 to reheat the high-pressure cylinder exhaust steam. The two streams of molten salt merge through the three-way valve 25 and return to the low-temperature molten salt tank 3. In this mode, the cladding and divertor are disconnected from the system, and the stored high-temperature molten salt is used to meet the main steam generation and reheat requirements, ensuring continuous and stable power generation of the Rankine cycle throughout the entire intermittent period.

[0042] In summary, this invention constructs an asymmetric energy storage structure that combines a shared low-temperature molten salt tank and a dedicated high-temperature molten salt tank for the divertor. During operation, it converts fluctuating heat from the divertor into molten salt internal energy in real time, allowing the molten salt temperature to rise to the level required for reheating, and then releases it stably during the intermittent period. This invention simultaneously solves two major obstacles: insufficient temperature grade of the divertor and fluctuations in the heat source. It proactively creates the thermodynamic conditions for the divertor to participate in the reheat process, rather than simply changing the direction of heat dissipation. Through dual-mode switching between operation and intermittent periods, it ensures the stability of the main steam and reheat steam parameters throughout the entire Rankine cycle without requiring a large, independent energy storage system for the divertor.

[0043] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for reheating energy storage in a high-temperature divertor heat source of a fusion reactor, characterized in that, include: During the fusion reactor's operation, the molten salt is heated using the high-temperature heat from the divertor and stored in a second high-temperature molten salt tank specifically designed for the divertor. In the power generation stage, the high-temperature molten salt stored in the second high-temperature molten salt tank is used for the reheat process of the Rankine cycle, thereby heating the exhaust steam of the high-pressure cylinder and improving the cycle thermal efficiency. At the same time, a second energy storage heat exchanger, a reheater, and a low-temperature molten salt tank are set up to smooth out the thermal power fluctuations caused by the pulse operation of the fusion reactor, ensuring that the stored heat can still generate electricity continuously and stably even in the intermittent mode of the fusion reactor. The blanket and the divertor share a low-temperature molten salt tank, and are equipped with independent first and second high-temperature molten salt tanks, forming an asymmetric energy storage structure. The high-temperature heat source of the divertor is used for Rankine cycle reheat, and the pulse fluctuations are smoothed through the second high-temperature molten salt tank of the divertor, ensuring the stability of the reheat parameters throughout the cycle and achieving efficient and stable power generation.

2. The method for energy storage and reheating of a high-temperature divertor heat source in a fusion reactor according to claim 1, characterized in that, During the fusion reactor operation, the superheated steam from the steam generator outlet expands and does work through the high-pressure cylinder. The exhaust steam from the high-pressure cylinder enters the reheater, is heated, and then enters the intermediate-pressure cylinder and low-pressure cylinder to continue doing work. The exhaust steam is condensed and returned to the steam generator via the feedwater pump, completing the Rankine cycle.

3. The method for energy storage and reheating of a high-temperature divertor heat source in a fusion reactor according to claim 1, characterized in that, During the fusion reactor intermittent mode, the blanket and divertor cease operation, and the Rankine cycle continues to generate electricity solely by releasing heat to the steam generator and reheater from the high-temperature molten salt stored in the first and second high-temperature molten salt tanks.

4. A reheat device for energy storage of a high-temperature divertor heat source in a fusion reactor, used to implement the reheat method for energy storage of a high-temperature divertor heat source in a fusion reactor as described in any one of claims 1-3, characterized in that, The system includes a fusion reactor heat source subsystem, an intermediate energy storage subsystem, and a Rankine cycle power generation system. The fusion reactor heat source subsystem includes a blanket and a divertor. The intermediate energy storage subsystem includes a cryogenic molten salt tank, a first high-temperature molten salt tank corresponding to the blanket, a second high-temperature molten salt tank corresponding to the divertor, a first energy storage heat exchanger, and a second energy storage heat exchanger. The outlet of the blanket is connected to the hot-side inlet of the first energy storage heat exchanger, and the inlet of the blanket is connected to the hot-side outlet of the first energy storage heat exchanger. The outlet of the divertor is connected to the hot-side inlet of the second energy storage heat exchanger, and the inlet of the divertor is connected to the hot-side outlet of the second energy storage heat exchanger. The molten salt outlet of the first high-temperature molten salt tank... The first high-temperature molten salt pump is connected to the hot-side inlet of the steam generator in the Rankine cycle power generation system, and the hot-side outlet of the steam generator is connected to the inlet of the low-temperature molten salt tank via a three-way valve; the molten salt outlet of the second high-temperature molten salt tank is connected to the hot-side inlet of the reheater in the Rankine cycle power generation system via a second high-temperature molten salt pump, and the hot-side outlet of the reheater is connected to the inlet of the low-temperature molten salt tank via the aforementioned three-way valve; the steam inlet of the steam turbine in the Rankine cycle power generation system is connected to the steam outlet of the steam generator, the steam outlet of the steam turbine is connected to the steam inlet of the condenser, and the water outlet of the condenser is connected to the feedwater inlet of the steam generator via a feedwater pump.

5. The fusion reactor high-temperature divertor heat source energy storage and reheat device according to claim 4, characterized in that, The outlet of the low-temperature molten salt tank is connected to the cold-side inlet of the first energy storage heat exchanger and the cold-side inlet of the second energy storage heat exchanger via a low-temperature molten salt pump; the cold-side outlet of the first energy storage heat exchanger is connected to the inlet of the first high-temperature molten salt tank; and the cold-side outlet of the second energy storage heat exchanger is connected to the inlet of the second high-temperature molten salt tank.

6. The fusion reactor high-temperature divertor heat source energy storage and reheat device according to claim 4, characterized in that, The fusion reactor heat source subsystem also includes a first circulating working fluid pump and a second circulating working fluid pump; the first circulating working fluid pump is located between the hot-side outlet of the first energy storage heat exchanger and the inlet of the cladding; the second circulating working fluid pump is located between the hot-side outlet of the second energy storage heat exchanger and the inlet of the divertor.

7. The fusion reactor high-temperature divertor heat source energy storage and reheat device according to claim 4, characterized in that, The steam generator in the Rankine cycle power generation system is equipped with a reheater, or the reheater is set up independently outside the steam generator; the steam inlet of the reheater is used to receive the exhaust steam from the high-pressure cylinder of the steam turbine, and the steam outlet of the reheater is connected to the steam inlet of the intermediate-pressure cylinder of the steam turbine.

8. The fusion reactor high-temperature divertor heat source energy storage and reheat device according to claim 4, characterized in that, It also includes a first isolation valve, a second isolation valve, a third isolation valve, and a reheat valve; the first isolation valve is located between the blanket outlet and the hot-side inlet of the first energy storage heat exchanger; the second isolation valve is located between the cold-side outlet of the first energy storage heat exchanger and the inlet of the first high-temperature molten salt tank; the third isolation valve is located between the divertor outlet and the hot-side inlet of the second energy storage heat exchanger; the reheat valve is located between the outlet of the first high-temperature molten salt pump and the cold-side inlet of the second energy storage heat exchanger; during fusion reactor operation, the first isolation valve, the second isolation valve, the third isolation valve, and the reheat valve are all open; during fusion reactor shutdown, the first isolation valve, the second isolation valve, the third isolation valve, and the reheat valve are all closed.

9. A fusion reactor high-temperature divertor heat source energy storage and reheat device according to claim 8, characterized in that, During fusion reactor operation, the first isolation valve, second isolation valve, third isolation valve, and reheat valve are opened, and the cryogenic molten salt pump, first circulating working fluid pump, and second circulating working fluid pump are started. The blanket transfers heat to the cryogenic molten salt through the first energy storage heat exchanger. The heated molten salt enters the first high-temperature molten salt tank. Part of the molten salt in the first high-temperature molten salt tank is pumped into the steam generator to produce superheated steam. The divertor transfers heat to the cryogenic molten salt through the second energy storage heat exchanger. The heated molten salt enters the second high-temperature molten salt tank. Molten salt enters the reheater via the second high-temperature molten salt pump to heat the high-pressure cylinder exhaust steam. In the fusion reactor intermittent mode, the first isolation valve, the second isolation valve, the third isolation valve, and the reheat valve are closed, and the cryogenic molten salt pump, the first circulating working fluid pump, and the second circulating working fluid pump are stopped. The molten salt stored in the first high-temperature molten salt tank releases heat to the steam generator to produce superheated steam, and the molten salt stored in the second high-temperature molten salt tank releases heat to the reheater to reheat the high-pressure cylinder exhaust steam. The two streams of molten salt merge through a three-way valve and return to the cryogenic molten salt tank.

10. A fusion reactor high-temperature divertor heat source energy storage and reheat device according to claim 9, characterized in that, When switching from the fusion reactor operation mode to the fusion reactor off-peak mode, the first isolation valve, the second isolation valve, the third isolation valve, and the reheat valve are closed first, and then the cryogenic molten salt pump, the first circulating working fluid pump, and the second circulating working fluid pump are stopped in sequence. When switching from the fusion reactor off-peak mode to the fusion reactor operation mode, the cryogenic molten salt pump, the first circulating working fluid pump, and the second circulating working fluid pump are started first. After the molten salt flow rate stabilizes, the first isolation valve, the second isolation valve, the third isolation valve, and the reheat valve are opened to achieve a smooth transition between the two modes.

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