Retrofitting method for replacing thermal power with nuclear power while taking into account both peak regulation and heat supply, and generator unit taking into account both peak regulation and heat supply
Patent Information
- Application Number
- PCT/CN2026/071548
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-28
- Filing Date
- 2026-01-09
- Publication Date
- 2026-09-03
Smart Images
Figure CN2026071548_03092026_PF_FP_ABST
Abstract
Description
A method for nuclear power to replace thermal power and a generator set that also takes into account peak shaving and heating. Technical Field
[0001] This invention relates to the field of thermal power plant retrofitting technology, and in particular to a method and generator set for nuclear power to replace thermal power plants while also taking into account peak shaving and heating. Background Technology
[0002] Building a new power system is a key measure for China to achieve its carbon neutrality goal. The core challenge of this new power system is how to achieve the orderly reduction of thermal power while ensuring the safe and reliable replacement of renewable energy sources. China's power system has a large stock of thermal power, a high proportion of thermal power, and high carbon emissions, making the situation for reducing carbon emissions from thermal power a serious challenge.
[0003] Currently, besides early decommissioning and reducing direct emissions through carbon capture systems, retrofitting thermal power units using low-carbon technologies such as nuclear energy is another viable approach to carbon reduction measures for coal-fired power plants. From a functional perspective, both nuclear and coal-fired power can serve as baseload power sources. From a resource utilization perspective, rigidly retiring coal-fired power plants with long remaining lifespans and dismantling existing plants would be costly overall. Therefore, retrofitting coal-fired power plants with nuclear power can utilize existing grid connection systems, water sources, land, transmission facilities, and some process equipment and infrastructure, thereby reducing the overall cost of the power plant.
[0004] However, frequent adjustments to the reactor load at nuclear power plants can cause fluctuations in reactor status, posing operational safety risks. Due to their inherent technical characteristics, nuclear power plants have significantly lower peak-shaving and frequency regulation capabilities than thermal power units, resulting in less flexibility. A considerable number of thermal power units in my country simultaneously generate electricity and provide heat, operating according to the principle of heat-driven power generation. In contrast, most nuclear power units in my country do not possess heat-providing capabilities. Therefore, it is necessary to research a method for converting thermal power units into nuclear power units to address the mismatch between power output and peak-shaving capabilities encountered during this conversion process. Summary of the Invention
[0005] To address the mismatch in peak-shaving capacity during the conversion of thermal power to nuclear power, this invention provides a method and generator set for nuclear power to replace thermal power, which also takes into account peak-shaving and heating.
[0006] In a first aspect, embodiments of the present invention provide a method for nuclear power substitution for thermal power that also takes into account peak-shaving and heating, including:
[0007] The steam heat from the nuclear island steam generator is stored in the molten salt of the first molten salt assembly using a steam-molten salt heat exchanger.
[0008] The heat exchange component is used to heat the water in the feedwater pipeline to generate steam, so that the steam drives the steam turbine to work.
[0009] The hydrophobic heat from the steam-molten salt heat exchanger is stored in the molten salt of the second molten salt assembly using a hydrophobic molten salt heat exchanger.
[0010] The molten salt heat from the second molten salt assembly is transferred to the primary heating network pipes using a heating heater.
[0011] Secondly, embodiments of the present invention provide a generator set that also provides peak-shaving heating, applied to the method described in the above embodiments, including a nuclear island steam generator, a steam molten salt heat exchanger, a hydrophobic molten salt heat exchanger, a first molten salt assembly, a second molten salt assembly, a heat exchange assembly, a feedwater pipeline, a steam turbine, a generator, a heating heater, and a primary heating network pipeline. The steam molten salt heat exchanger is connected to the nuclear island steam generator and the first molten salt assembly respectively, and is used to store the steam heat from the nuclear island steam generator in the molten salt of the first molten salt assembly. The hydrophobic molten salt heat exchanger is connected to the steam molten salt heat exchanger and the second molten salt assembly respectively, and is used to store the hydrophobic heat from the steam molten salt heat exchanger in the molten salt of the second molten salt assembly. The heat exchange assembly is connected to the first molten salt assembly and the feedwater pipeline respectively. The steam turbine is connected to the heat exchange assembly through a steam pipeline and to the generator. The heating heater is connected to the second molten salt assembly and the primary heating network pipeline respectively, and is used to transfer the molten salt heat from the second molten salt assembly to the primary heating network pipeline.
[0012] This invention provides a method and generator set for nuclear power conversion to replace thermal power plants, which also considers peak-shaving and heating. The method stores the steam heat from the secondary loop of the nuclear island in a first molten salt assembly (i.e., high-temperature molten salt) and a second molten salt assembly (i.e., low-temperature molten salt). Different molten salt heat absorption and release system powers are matched to the nuclear island reactor power and the original thermal power turbine generator power, respectively, thus decoupling the operation of the nuclear island reactor system and the turbine generator system. Simultaneously, by setting up a low-temperature molten salt energy storage system, the system can supply heat to the outside world. Decoupling allows the reactor power to differ from the original thermal power turbine generator power, solving the power mismatch problem in the thermal-to-nuclear power conversion process. Decoupling also allows the turbine generator power to flexibly adjust peak loads according to grid requirements, while the reactor power can remain constant, solving the peak-shaving capacity mismatch problem in the thermal-to-nuclear power conversion process. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 is a flowchart of a nuclear power replacement method for thermal power generation that takes into account both peak-shaving and heating, according to an embodiment of the present invention.
[0015] Figure 2 is a schematic diagram of a nuclear power coupled with thermal power generation unit provided in an embodiment of the present invention.
[0016] Reference numerals: 1-Nuclear island steam generator; 2-Steam molten salt heat exchanger; 3-Drain molten salt heat exchanger; 4-Feedwater pipeline; 5-Steam turbine; 6-Generator; 7-Heating heater; 8-Primary heating network pipeline; 9-High-temperature zone hot salt tank; 10-High-temperature zone hot salt pump; 11-High-temperature zone cold salt tank; 12-High-temperature zone cold salt pump; 13-First molten salt pipeline; 14-Second molten salt pipeline; 15-Molten salt electric heater; 16-Superheater; 17-Evaporator; 18-Preheater ; 19-Reheater; 20-Third molten salt pipeline; 21-Main steam pipeline of thermal power plant; 22-Cold section pipeline of thermal power plant; 23-Hot section pipeline of thermal power plant; 24-Low temperature zone hot salt tank; 25-Low temperature zone hot salt pump; 26-Low temperature zone cold salt tank; 27-Low temperature zone cold salt pump; 28-Fourth molten salt pipeline; 29-Fifth molten salt pipeline; 30-Extraction steam feedwater heat exchanger; 31-Extraction steam pipeline; 32-Feedwater pump of thermal power plant; 33-Molten salt feedwater heat exchanger; 34-Nuclear island feedwater pump. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0018] As shown in Figures 1 and 2, the nuclear power replacement method for thermal power plants, which also takes into account peak-shaving and heating, provided in this embodiment of the invention includes:
[0019] Step S1: Use the steam-molten salt heat exchanger 2 to store the steam heat from the nuclear island steam generator 1 into the molten salt of the first molten salt assembly;
[0020] Step S2: Use the heat exchange components to heat the water in the feedwater pipe 4 to generate steam, so that the steam drives the turbine 5 to work.
[0021] Step S3: Use the hydrophobic molten salt heat exchanger 3 to store the hydrophobic heat from the steam molten salt heat exchanger 2 into the molten salt of the second molten salt assembly;
[0022] Step S4: Use the heating heater 7 to transfer the molten salt heat of the second molten salt assembly to the primary heating network pipe 8.
[0023] In this embodiment, the steam heat from the secondary loop of the nuclear island is stored in the first molten salt assembly (i.e., the high-temperature zone molten salt) and the second molten salt assembly (i.e., the low-temperature zone molten salt). Different molten salt heat absorption system power and molten salt heat release system power are matched to the nuclear island reactor power and the original thermal power turbine generator power, respectively, thus decoupling the operation of the nuclear island reactor system and the turbine generator system. Simultaneously, by setting up a low-temperature zone molten salt energy storage system, the system can supply heat to the outside world. Decoupling allows the reactor power to differ from the original thermal power turbine generator power, solving the power mismatch problem during the thermal power to nuclear power conversion. Decoupling also allows the turbine generator power to flexibly adjust peak loads according to grid requirements, while the reactor power can remain constant, solving the peak load mismatch problem during the thermal power to nuclear power conversion.
[0024] It should be noted that the aforementioned combined generating units refer to the conversion of existing thermal power plants into nuclear power plants. A nuclear power plant mainly consists of a nuclear island reactor system, a conventional island turbine generator system, and auxiliary systems. A thermal power plant mainly consists of a boiler system, a main plant turbine generator system, and auxiliary systems. The nuclear power conversion of a thermal power unit involves replacing the boiler system with the nuclear island reactor system to provide heat to the power plant, while reusing other parts of the original thermal power unit, such as the turbine generator system, as much as possible. While utilizing the existing power grid connection system to reduce the overall cost of the power plant, the converted power plant also needs to possess peak-shaving and frequency regulation capabilities and a certain external heat supply capacity to match the original thermal power unit, in order to meet the grid's requirements for power plant flexibility and heat supply.
[0025] In one embodiment of the present invention, the first molten salt assembly includes a high-temperature zone hot salt tank 9, a high-temperature zone hot salt pump 10, a high-temperature zone cold salt tank 11 and a high-temperature zone cold salt pump 12, and the high-temperature zone hot salt tank 9 and the high-temperature zone cold salt tank 11 are connected by a first molten salt pipe 13 and a second molten salt pipe 14.
[0026] The steam heat from the nuclear island steam generator 1 is stored in the molten salt of the first molten salt assembly using a steam-molten salt heat exchanger 2, including:
[0027] The high-temperature zone cold salt pump 12 is used to supply the high-temperature zone cold molten salt in the high-temperature zone cold salt tank 11 to the high-temperature zone hot salt tank 9 through the first molten salt pipeline 13; wherein, the high-temperature zone cold molten salt absorbs the steam heat of the nuclear island steam generator 1 in the first molten salt pipeline 13.
[0028] In one embodiment of the present invention, the first molten salt assembly further includes a molten salt electric heater 15, which is disposed on the first molten salt pipeline 13 and located between the steam molten salt heat exchanger 2 and the high-temperature zone hot salt tank 9.
[0029] Also includes:
[0030] The molten salt flowing out of the steam molten salt heat exchanger 2 is further heated by the molten salt electric heater 15.
[0031] In one embodiment of the present invention, the heat exchange assembly includes a superheater 16, an evaporator 17 and a preheater 18 arranged sequentially along the flow direction of the hot molten salt, and the preheater 18, the evaporator 17 and the superheater 16 are arranged sequentially along the flow direction of the feed water, and the outlet of the superheater 16 is connected to the steam turbine 5.
[0032] The heat exchanger uses the molten salt heat from the first molten salt assembly to heat the water supply in the water supply pipe 4 to generate steam, including:
[0033] Superheated steam is generated by heating the water supply in the water supply pipe 4 in sequence using the preheater 18, evaporator 17 and superheater 16.
[0034] In one embodiment of the present invention, the heat exchange assembly further includes a reheater 19, the second molten salt pipe 14 is also connected in parallel with a third molten salt pipe 20, the reheater 19 is disposed on the third molten salt pipe 20, the steam turbine 5 includes a high-pressure cylinder and an intermediate-pressure cylinder, the outlet of the superheater 16 is connected to the inlet of the high-pressure cylinder through the thermal power main steam pipe 21, the outlet of the high-pressure cylinder is connected to the inlet of the reheater 19 through the thermal power cold section pipe 22, and the outlet of the reheater 19 is connected to the inlet of the intermediate-pressure cylinder through the thermal power hot section pipe 23.
[0035] The heat exchanger uses the molten salt heat from the first molten salt assembly to heat the water supply in the water supply pipe 4 to generate steam, including:
[0036] The exhaust steam from the high-pressure cylinder is reheated using reheater 19 so that the generated steam enters the intermediate-pressure cylinder through the thermal section pipe 23.
[0037] In one embodiment of the present invention, the second molten salt assembly includes a low-temperature zone hot salt tank 24, a low-temperature zone hot salt pump 25, a low-temperature zone cold salt tank 26, and a low-temperature zone cold salt pump 27. The low-temperature zone hot salt tank 24 and the low-temperature zone cold salt tank 26 are connected by a fourth molten salt pipe 28 and a fifth molten salt pipe 29.
[0038] The hydrophobic heat from the steam-molten salt heat exchanger 2 is stored in the molten salt of the second molten salt assembly using the hydrophobic molten salt heat exchanger 3, including:
[0039] The low-temperature zone cold molten salt in the low-temperature zone cold salt tank 26 is supplied to the low-temperature zone hot salt tank 24 through the fourth molten salt pipeline 28 using the low-temperature zone cold salt pump 27; wherein, the low-temperature zone cold molten salt absorbs the hydrophobic heat of the steam molten salt heat exchanger 2 in the fourth molten salt pipeline 28.
[0040] In one embodiment of the present invention, the molten salt of the first molten salt assembly is a binary salt, and the molten salt of the second molten salt assembly is a ternary salt.
[0041] Furthermore, this embodiment of the invention also provides a generator set that also serves peak-shaving heating, applied to the method mentioned in any of the above embodiments, including a nuclear island steam generator 1, a steam molten salt heat exchanger 2, a hydrophobic molten salt heat exchanger 3, a first molten salt assembly, a second molten salt assembly, a heat exchange assembly, a feedwater pipeline 4, a steam turbine 5, a generator 6, a heating heater 7, and a primary heating network pipeline 8. The steam molten salt heat exchanger 2 is connected to the nuclear island steam generator 1 and the first molten salt assembly respectively, and is used to store the steam heat from the nuclear island steam generator 1 to the second molten salt assembly. In the molten salt of a molten salt assembly, a hydrophobic molten salt heat exchanger 3 is connected to a steam molten salt heat exchanger 2 and a second molten salt assembly, respectively, to store the hydrophobic heat from the steam molten salt heat exchanger 2 into the molten salt of the second molten salt assembly. The heat exchange assembly is connected to a first molten salt assembly and a water supply pipe 4, respectively. A steam turbine 5 is connected to the heat exchange assembly through a steam pipe and is connected to a generator 6. A heating heater 7 is connected to the second molten salt assembly and a primary heating network pipe 8, respectively, to transfer the heat from the molten salt of the second molten salt assembly to the primary heating network pipe 8.
[0042] In one embodiment of the present invention, the inlet of the third molten salt pipe 20 is located at the inlet of the superheater 16, and the outlet of the third molten salt pipe 20 is located between the superheater 16 and the evaporator 17.
[0043] In one embodiment of the present invention, the invention further includes a steam extraction feedwater heat exchanger 30 and a molten salt feedwater heat exchanger 33. One end of the steam extraction feedwater heat exchanger 30 is connected to a high-pressure cylinder via a steam extraction pipe 31, and the other end is connected to a feedwater pipe 4. A thermal power feedwater pump 32 is installed on the feedwater pipe 4. The molten salt feedwater heat exchanger 33 and the steam extraction feedwater heat exchanger 30 are connected in parallel on the feedwater pipe 4. The molten salt feedwater heat exchanger 33 is connected to the feedwater pipe 4 and the fifth molten salt pipe 29, respectively. A nuclear island feedwater pump 34 is installed on the pipe between the hydrophobic molten salt heat exchanger 3 and the nuclear island steam generator 1.
[0044] The process and purpose of the above technical solution are described below.
[0045] 1) Molten salt endothermic system
[0046] High-temperature steam from the outlet of nuclear island steam generator 1 enters steam-molten salt heat exchanger 2, heating the molten salt in the high-temperature zone and turning it into condensate. The condensate from the outlet of steam-molten salt heat exchanger 2 enters condensate-molten salt heat exchanger 3, heating the molten salt in the low-temperature zone. After being cooled to the required inlet water temperature for nuclear island steam generator 1, it is pressurized by nuclear island feedwater pump 34 and enters nuclear island steam generator 1. Low-temperature binary salt in high-temperature zone cold salt tank 11 is pressurized by high-temperature zone cold salt pump 12 and enters steam-molten salt heat exchanger 2, where it is heated by the high-temperature steam of the nuclear island. The molten salt from the outlet of steam-molten salt heat exchanger 2 enters molten salt electric heater 15 for further heating to the specified temperature before entering high-temperature zone hot salt tank 9. Low-temperature ternary salt in low-temperature zone cold salt tank 26 is pressurized by low-temperature zone cold salt pump 27 and enters condensate-molten salt heat exchanger 3, where it is heated by condensate to the specified temperature before entering low-temperature zone hot salt tank 24.
[0047] This system employs a dual-temperature molten salt energy storage system comprising a high-temperature molten salt system and a low-temperature molten salt system. The high-temperature molten salt medium uses a binary salt (e.g., it may include 60% sodium nitrate and 40% potassium nitrate by mass), while the low-temperature molten salt medium uses a ternary salt (e.g., it may include 7% sodium nitrate, 53% potassium nitrate, and 40% sodium nitrite by mass). The nuclear island reactor technology utilizes a high-temperature gas-cooled reactor, with high-temperature, high-pressure steam exiting the nuclear island steam generator. The high-temperature molten salt medium uses a binary salt, which has a high maximum operating temperature and excellent stability at high temperatures. After fully utilizing the latent heat of the high-pressure steam, it can be heated to a high temperature by the molten salt electric heater to meet the temperature requirements of the original thermal power unit's main steam and high-temperature reheat steam. The low-temperature molten salt medium uses a ternary salt, which has a lower melting point, enabling it to cool the feedwater entering the nuclear island steam generator to the required temperature without solidifying. In summary, by properly configuring the capacity of the cold salt pumps in the high and low temperature zones, the power of the molten salt heat absorption system can be matched with the power of the nuclear island reactor.
[0048] 2) Molten salt heat release system
[0049] Feedwater from the boiler inlet feedwater pipe 4 of the original thermal power unit enters the molten salt feedwater heat exchanger 33 and is heated before entering the steam generation system. It then passes through the preheater 18, evaporator 17, and superheater 16, where it is heated by molten salt into high-temperature superheated steam, which enters the original thermal power main steam pipe 21. Low-temperature reheated steam from the original thermal power cold section pipe 22 enters the reheater and is heated by molten salt into high-temperature reheated steam before entering the original thermal power hot section pipe 23. High-temperature binary salt in the high-temperature zone hot salt tank 9 is pressurized by the high-temperature zone hot salt pump 10 and enters the steam generation system, splitting into two streams: one enters the superheater 16, and the other enters the reheater 19. The two streams of molten salt are cooled by the steam and merged into one stream, which then enters the evaporator 17 and preheater 18, finally being cooled into low-temperature binary salt and entering the high-temperature zone cold salt tank 11. The high-temperature ternary salt in the low-temperature zone hot salt tank 24 is pressurized by the low-temperature zone hot salt pump 25 and then divided into two paths. One path enters the heating heater 7, which heats the return water of the primary heating network and then enters the primary heating network supply water pipeline for external heating. The other path enters the molten salt feed water heat exchanger 33, which heats part of the deaerator to supply water and reduce the amount of steam extracted during reheating. After the two molten salts are cooled into low-temperature ternary salt, they merge into one path and enter the low-temperature zone cold salt tank 26.
[0050] In this system, considering the anti-condensation problem of low-temperature binary salt in the high-temperature zone, the outlet condensate temperature of the steam molten salt heat exchanger 2 is relatively high. By setting up a low-temperature molten salt system, a heating heater 7, and a molten salt feedwater heat exchanger 33, the heat from the outlet condensate of the steam molten salt heat exchanger 2 can be fully utilized to heat the return water of the heating network and part of the feedwater from the deaerator. This lowers the condensate temperature while providing external heat supply and reduces the amount of regenerative steam extraction, thus increasing the system's power generation capacity. Simultaneously, the amount of low-temperature molten salt entering the heating heater 7 and the molten salt feedwater heat exchanger 33 can be adjusted according to the heating demand and the power requirements of the steam turbine generator. By rationally configuring the capacity of the high- and low-temperature zone hot salt pumps, the power of the molten salt heat release system can be matched with the original power of the thermal power turbine and the heating load.
[0051] 3) Steam turbine generator system
[0052] The original thermal power plant turbine generator system remains unchanged. High-temperature, high-pressure main steam from the molten salt heat release system enters the original thermal power plant main steam pipeline 21, and then enters the original turbine high-pressure cylinder to drive the turbine for power generation. Exhaust steam from the turbine high-pressure cylinder enters the molten salt heat release system reheater 19 via the original thermal power plant cold section pipeline 22. After being heated to high-temperature reheat steam, it enters the original thermal power plant hot section pipeline 23, and then enters the original thermal power plant turbine intermediate-pressure cylinder to drive the turbine for power generation. The feedwater from the original thermal power plant feedwater pump outlet is divided into two paths: one path enters the original thermal power plant extraction steam feedwater heat exchanger 30 to be heated by the extraction steam, and the other path enters the molten salt feedwater heat exchanger 33 to be heated by the low-temperature molten salt. After both feedwater paths are heated to the same temperature, they enter the molten salt heat release system.
[0053] In this system, the feedwater flow rate into the original extraction steam feedwater heat exchanger 30 and molten salt feedwater heat exchanger 33 can be adjusted according to the molten salt heat storage capacity in the low temperature zone and the power of the steam turbine generator, thereby reducing the steam extraction volume of the steam turbine and increasing the power generation capacity of the steam turbine.
[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for nuclear power to replace thermal power plants while also considering peak-shaving and heating, characterized in that, include: The steam heat from the nuclear island steam generator (1) is stored in the molten salt of the first molten salt assembly using a steam molten salt heat exchanger (2); The heat exchange component is used to heat the water in the feedwater pipe (4) to generate steam, so that the steam drives the steam turbine (5) to work. The hydrophobic heat from the steam-molten salt heat exchanger (2) is stored in the molten salt of the second molten salt assembly using a hydrophobic molten salt heat exchanger (3); The molten salt heat of the second molten salt assembly is transferred to the primary heating network pipeline (8) using the heating heater (7).
2. The method according to claim 1, characterized in that, The first molten salt assembly includes a high-temperature zone hot salt tank (9), a high-temperature zone hot salt pump (10), a high-temperature zone cold salt tank (11), and a high-temperature zone cold salt pump (12). The high-temperature zone hot salt tank (9) and the high-temperature zone cold salt tank (11) are connected by a first molten salt pipe (13) and a second molten salt pipe (14). The method of storing the steam heat from the nuclear island steam generator (1) into the molten salt of the first molten salt assembly using a steam-molten salt heat exchanger (2) includes: The high-temperature zone cold salt pump (12) supplies the high-temperature zone cold molten salt in the high-temperature zone cold salt tank (11) to the high-temperature zone hot salt tank (9) through the first molten salt pipe (13); wherein the high-temperature zone cold molten salt absorbs the steam heat of the nuclear island steam generator (1) in the first molten salt pipe (13).
3. The method according to claim 2, characterized in that, The first molten salt assembly further includes a molten salt electric heater (15), which is disposed on the first molten salt pipeline (13) and located between the steam molten salt heat exchanger (2) and the high-temperature zone hot salt tank (9); Also includes: The molten salt flowing out of the steam molten salt heat exchanger (2) is further heated using the molten salt electric heater (15).
4. The method according to claim 3, characterized in that, The heat exchange assembly includes a superheater (16), an evaporator (17) and a preheater (18) arranged sequentially along the flow direction of the hot molten salt, and the preheater (18), the evaporator (17) and the superheater (16) are arranged sequentially along the flow direction of the feed water, and the outlet of the superheater (16) is connected to the steam turbine (5). The method of using a heat exchange component to heat the water supply in the water supply pipe (4) to generate steam by molten salt heat from the first molten salt component includes: The water supply in the water supply pipe (4) is heated in sequence by the preheater (18), the evaporator (17) and the superheater (16) to generate superheated steam.
5. The method according to claim 4, characterized in that, The heat exchange assembly also includes a reheater (19), and the second molten salt pipe (14) is also connected in parallel with a third molten salt pipe (20). The reheater (19) is installed on the third molten salt pipe (20). The steam turbine (5) includes a high-pressure cylinder and an intermediate-pressure cylinder. The outlet of the superheater (16) is connected to the inlet of the high-pressure cylinder through the thermal power main steam pipe (21). The outlet of the high-pressure cylinder is connected to the inlet of the reheater (19) through the thermal power cold section pipe (22). The outlet of the reheater (19) is connected to the inlet of the intermediate-pressure cylinder through the thermal power hot section pipe (23). The method of using a heat exchange component to heat the water supply in the water supply pipe (4) to generate steam by molten salt heat from the first molten salt component includes: The exhaust steam from the high-pressure cylinder is reheated using the reheater (19) so that the generated steam enters the intermediate-pressure cylinder through the thermal section pipe (23).
6. The method according to claim 5, characterized in that, The second molten salt assembly includes a low-temperature zone hot salt tank (24), a low-temperature zone hot salt pump (25), a low-temperature zone cold salt tank (26), and a low-temperature zone cold salt pump (27). The low-temperature zone hot salt tank (24) and the low-temperature zone cold salt tank (26) are connected by a fourth molten salt pipe (28) and a fifth molten salt pipe (29). The method of storing the hydrophobic heat from the steam-molten salt heat exchanger (2) in the molten salt of the second molten salt assembly using a hydrophobic molten salt heat exchanger (3) includes: The low-temperature zone cold molten salt in the low-temperature zone cold salt tank (26) is supplied to the low-temperature zone hot salt tank (24) through the fourth molten salt pipe (28) using the low-temperature zone cold salt pump (27); wherein the low-temperature zone cold molten salt absorbs the hydrophobic heat of the steam molten salt heat exchanger (2) in the fourth molten salt pipe (28).
7. The method according to any one of claims 1-6, characterized in that, The molten salt of the first molten salt assembly is a binary salt, and the molten salt of the second molten salt assembly is a ternary salt.
8. A generator set that also serves peak-shaving and heating purposes, characterized in that, The method described in claim 6 includes a nuclear island steam generator (1), a steam molten salt heat exchanger (2), a hydrophobic molten salt heat exchanger (3), a first molten salt assembly, a second molten salt assembly, a heat exchange assembly, a feedwater pipeline (4), a steam turbine (5), a generator (6), a heating heater (7), and a primary heating network pipeline (8). The steam molten salt heat exchanger (2) is connected to the nuclear island steam generator (1) and the first molten salt assembly, respectively, for storing the steam heat of the nuclear island steam generator (1) in the molten salt of the first molten salt assembly. The hydrophobic molten salt heat exchanger (3) is connected to the first molten salt assembly and the second molten salt assembly, respectively. The steam molten salt heat exchanger (2) is connected to the second molten salt assembly to store the hydrophobic heat of the steam molten salt heat exchanger (2) in the molten salt of the second molten salt assembly. The heat exchange assembly is connected to the first molten salt assembly and the water supply pipe (4) respectively. The steam turbine (5) is connected to the heat exchange assembly through the steam pipe. The steam turbine (5) is connected to the generator (6). The heating heater (7) is connected to the second molten salt assembly and the primary heating network pipe (8) respectively to transfer the molten salt heat of the second molten salt assembly to the primary heating network pipe (8).
9. The generator set according to claim 8, characterized in that, The inlet of the third molten salt pipe (20) is located at the inlet of the superheater (16), and the outlet of the third molten salt pipe (20) is located between the superheater (16) and the evaporator (17).
10. The generator set according to claim 9, characterized in that, It also includes a steam extraction feedwater heat exchanger (30) and a molten salt feedwater heat exchanger (33). One end of the steam extraction feedwater heat exchanger (30) is connected to the high-pressure cylinder through a steam extraction pipe (31), and the other end is connected to the feedwater pipe (4). A thermal power feedwater pump (32) is installed on the feedwater pipe (4). The molten salt feedwater heat exchanger (33) and the steam extraction feedwater heat exchanger (30) are connected in parallel on the feedwater pipe (4). The molten salt feedwater heat exchanger (33) is connected to the feedwater pipe (4) and the fifth molten salt pipe (29) respectively. A nuclear island feedwater pump (34) is installed on the pipe between the hydrophobic molten salt heat exchanger (3) and the nuclear island steam generator (1).