Generator set capable of transforming thermal power into nuclear power and giving consideration to peak regulation and heat supply
By introducing high-temperature and low-temperature molten salt energy storage systems during the conversion of thermal power plants to nuclear power plants, the operation of the nuclear island reactor and steam turbine generator is decoupled, solving the problem of mismatch between peak-shaving capacity and heating function, achieving flexible matching of peak-shaving and heating, and reducing conversion costs.
Patent Information
- Application Number
- CN202520348582.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-02-28
AI Technical Summary
During the conversion of thermal power units into nuclear power units, there is a mismatch between peak-shaving capacity and heating function, resulting in a power mismatch problem.
By introducing high-temperature and low-temperature molten salt energy storage systems in nuclear power plant retrofitting, the heat from the nuclear island reactor and steam turbine generator can be stored and released respectively, decoupling their operation and achieving flexible peak shaving and heating.
This achieved a match between the flexible peak-shaving capacity and heating function of the nuclear power unit after the renovation, reduced the renovation cost, and improved the flexibility and heating capacity of the power grid.
Smart Images
Figure CN223908276U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of thermal power transformation, especially relates to a thermal power transformation nuclear power generator unit considering peak regulation and heat supply. BACKGROUND
[0002] How to realize the orderly reduction of thermal power on the basis of safe and reliable replacement of new energy is the core problem of new power system. The thermal power reserves in China's power system are large, the proportion is high, and the carbon emission is high. The situation of carbon emission reduction of thermal power is severe.
[0003] At present, in addition to early retirement and reducing direct emissions through carbon capture systems, using low-carbon technologies such as nuclear energy to transform thermal power units is also an exploratory path. From the functional point of view, nuclear power and thermal power can be used as base load power supply. From the resource utilization rate point of view, thermal power is rigidly withdrawn in the case of long remaining life, and the overall cost of decommissioning and removing existing thermal power plants is high. Therefore, the nuclear power transformation of thermal power plants can utilize the existing power grid access system, water source, land, power transmission facilities and part of the process equipment and infrastructure resources of the thermal power plant to reduce the overall cost of the power plant.
[0004] However, frequent adjustment of nuclear power plant reactor load will cause reactor state fluctuation, which has operation safety hidden danger. Due to the technical characteristics of nuclear power, the peak regulation and frequency modulation capacity of nuclear power is much lower than that of thermal power unit, and the flexibility is poor. A considerable part of thermal power units in China have power generation and heat supply functions, and the unit operation follows the principle of heat determining power. Most of the nuclear power units in China do not have heat supply function. Therefore, a method for transforming thermal power units into nuclear power units is needed to solve the problem of mismatch between power and peak regulation capacity during the transformation of thermal power units into nuclear power units. CONTENT OF THE UTILITY MODEL
[0005] The utility model embodiment provides a kind of thermal power transformation nuclear power generator unit considering peak regulation and heat supply, can solve the problem of mismatch between peak regulation capacity during the transformation of thermal power into nuclear power.
[0006] The utility model discloses a nuclear power generation unit of thermal power transformation of giving consideration to peak regulation and heat supply, including nuclear island steam generator, steam molten salt heat exchanger, water drain molten salt heat exchanger, first molten salt subassembly, second molten salt subassembly, heat exchange subassembly, feedwater pipeline, steam turbine, generator, heating heater and heating primary network pipeline, steam molten salt heat exchanger is connected with nuclear island steam generator and first molten salt subassembly respectively, for the steam heat storage of nuclear island steam generator to the molten salt of first molten salt subassembly, water drain molten salt heat exchanger is connected with steam molten salt heat exchanger and second molten salt subassembly respectively, for the water drain heat storage of steam molten salt heat exchanger to the molten salt of second molten salt subassembly, heat exchange subassembly is connected with first molten salt subassembly and feedwater pipeline respectively, steam turbine is connected with heat exchange subassembly through steam pipeline, steam turbine is connected with generator, heating heater is connected with second molten salt subassembly and heating primary network pipeline respectively, for molten salt heat transfer of second molten salt subassembly to heating primary network pipeline.
[0007] Compared with the related art, the utility model has at least the following beneficial effects:
[0008] According to the nuclear power generation unit of thermal power transformation of giving consideration to peak regulation and heat supply provided by the utility model embodiment, the nuclear island two loop steam heat is stored in the first molten salt subassembly (namely high temperature area molten salt) and the second molten salt subassembly (namely low temperature area molten salt), and different molten salt heat absorption system power and molten salt heat release system power are matched and arranged according to the nuclear island reactor power and the original thermal power steam turbine generator power, so that the nuclear island reactor system operation and the steam turbine power generation system operation can be decoupled. BRIEF DESCRIPTION OF DRAWINGS
[0009] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.
[0010] Figure 1 The schematic diagram of the nuclear power generation unit of thermal power transformation of giving consideration to peak regulation and heat supply provided by the utility model embodiment.
[0011] Reference numerals:
[0012] 1 - nuclear island steam generator; 2 - steam molten salt heat exchanger; 3 - drain molten salt heat exchanger; 4 - feedwater pipe; 5 - steam turbine; 6 - generator; 7 - heating heater; 8 - heating primary network pipe; 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 pipe; 14 - second molten salt pipe; 15 - molten salt electric heater; 16 - superheater; 17 - evaporator; 18 - preheater; 19 - reheater; 20 - third molten salt pipe; 21 - main steam pipe of thermal power; 22 - cold section pipe of thermal power; 23 - hot section pipe of thermal power; 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 pipe; 29 - fifth molten salt pipe; 30 - extraction feedwater heat exchanger; 31 - extraction pipe; 32 - thermal power feedwater pump; 33 - molten salt feedwater heat exchanger; 34 - nuclear island feedwater pump. DETAILED DESCRIPTION
[0013] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.
[0014] Please refer to Figure 1 The embodiment of the present application provides a thermal power generator unit converted from thermal power to nuclear power by considering peak regulation and heat supply, which comprises a nuclear island steam generator 1, a steam molten salt heat exchanger 2, a drain molten salt heat exchanger 3, a first molten salt assembly, a second molten salt assembly, a heat exchange assembly, a feedwater pipe 4, a steam turbine 5, a generator 6, a heating heater 7 and a heating primary network pipe 8. The steam molten salt heat exchanger 2 is connected with the nuclear island steam generator 1 and the first molten salt assembly respectively, and is used for storing steam heat of the nuclear island steam generator 1 into molten salt of the first molten salt assembly. The drain molten salt heat exchanger 3 is connected with the steam molten salt heat exchanger 2 and the second molten salt assembly respectively, and is used for storing drain heat of the steam molten salt heat exchanger 2 into molten salt of the second molten salt assembly. The heat exchange assembly is connected with the first molten salt assembly and the feedwater pipe 4 respectively. The steam turbine 5 is connected with the heat exchange assembly through a steam pipe. The steam turbine 5 is connected with the generator 6. The heating heater 7 is connected with the second molten salt assembly and the heating primary network pipe 8 respectively, and is used for transmitting molten salt heat of the second molten salt assembly to the heating primary network pipe 8.
[0015] In the embodiment, the nuclear island secondary circuit steam heat is stored in the first molten salt assembly (i.e. high-temperature zone molten salt) and the second molten salt assembly (i.e. low-temperature zone molten salt), and different molten salt heat absorption system power and molten salt heat release system power are set according to the nuclear island reactor power and the original thermal power turbine generator power, respectively, and the nuclear island reactor system operation and the turbine generator system operation are decoupled. At the same time, the system external heat supply is realized by setting the low-temperature zone molten salt energy storage system. Through decoupling, the reactor power and the original thermal power turbine generator power can be different, and the power mismatch problem in the process of thermal power to nuclear power transformation is solved. Through decoupling, the turbine generator power can be flexibly adjusted according to the power grid requirements, and the reactor power can remain unchanged, and the peak regulation capability mismatch problem in the process of thermal power to nuclear power transformation is solved.
[0016] It should be noted that the above combined power and heat supply unit is a transformation of the original thermal power by nuclear power. The nuclear power plant mainly consists of a nuclear island reactor system, a conventional island turbine generator system and a whole plant auxiliary system. The thermal power plant mainly consists of a boiler system, a main plant turbine generator system and a whole plant auxiliary system. The thermal power unit is transformed into nuclear power, and the nuclear island reactor system is used to replace the boiler system of the thermal power unit to provide heat source for the power plant, and other parts of the original thermal power unit such as the turbine generator system are reused as much as possible. The thermal power plant is transformed into nuclear power, and the existing power grid access system of the thermal power plant is used to reduce the overall cost of the power plant, and the transformed power plant also needs to have peak regulation and frequency modulation capability and certain external heat supply capability matched with the original thermal power unit, so as to meet the requirements of the power grid for the flexibility of the power plant and the heat supply demand.
[0017] In an embodiment of the utility model, 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 pump 10 is arranged in the high-temperature zone hot salt tank 9, the high-temperature zone cold salt pump 12 is arranged in the high-temperature zone cold salt tank 11, the high-temperature zone hot salt tank 9 and the high-temperature zone cold salt tank 11 are connected by a first molten salt pipeline 13 and a second molten salt pipeline 14, the high-temperature zone cold molten salt enters the high-temperature zone hot salt tank 9 from the high-temperature zone cold salt tank 11 through the first molten salt pipeline 13, the high-temperature zone hot molten salt enters the high-temperature zone cold salt tank 11 from the high-temperature zone hot salt tank 9 through the second molten salt pipeline 14, the steam molten salt heat exchanger 2 is arranged on the first molten salt pipeline 13, and the heat exchange assembly is arranged on the second molten salt pipeline 14.
[0018] In an embodiment of the utility model, the first molten salt assembly further includes a molten salt electric heater 15, the molten salt electric heater 15 is arranged 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.
[0019] In an embodiment of the utility model, heat exchange assembly includes superheater 16, evaporator 17 and preheater 18 that are arranged in turn along the flow direction of hot molten salt, and preheater 18, evaporator 17 and superheater 16 are arranged in turn along the flow direction of feed water, and the outlet of superheater 16 is connected with steam turbine 5.
[0020] In an embodiment of the utility model, heat exchange assembly further includes reheater 19, second molten salt pipeline 14 is further connected with third molten salt pipeline 20 in parallel, reheater 19 is arranged on third molten salt pipeline 20, steam turbine 5 includes high-pressure cylinder and medium-pressure cylinder, the outlet of superheater 16 is connected with the inlet of high-pressure cylinder through main steam pipeline 21 of thermal power, the outlet of high-pressure cylinder is connected with the inlet of reheater 19 through cold section pipeline 22 of thermal power, and the outlet of reheater 19 is connected with the inlet of medium-pressure cylinder through hot section pipeline 23 of thermal power.
[0021] In an embodiment of the utility model, the inlet of third molten salt pipeline 20 is arranged at the inlet of superheater 16, and the outlet of third molten salt pipeline 20 is arranged between superheater 16 and evaporator 17.
[0022] In an embodiment of the utility model, second molten salt assembly includes low-temperature zone hot salt tank 24, low-temperature zone hot salt pump 25, low-temperature zone cold salt tank 26 and low-temperature zone cold salt pump 27, low-temperature zone hot salt pump 25 is arranged in low-temperature zone hot salt tank 24, low-temperature zone cold salt pump 27 is arranged in low-temperature zone cold salt tank 26, low-temperature zone hot salt tank 24 and low-temperature zone cold salt tank 26 are connected through fourth molten salt pipeline 28 and fifth molten salt pipeline 29, low-temperature zone cold molten salt enters low-temperature zone hot salt tank 24 from low-temperature zone cold salt tank 26 through fourth molten salt pipeline 28, low-temperature zone hot molten salt enters low-temperature zone cold salt tank 26 from low-temperature zone hot salt tank 24 through fifth molten salt pipeline 29, and heating heater 7 is connected with fifth molten salt pipeline 29.
[0023] In an embodiment of the utility model, further include steam extraction feed water heat exchanger 30, one end of steam extraction feed water heat exchanger 30 is connected with high-pressure cylinder through steam extraction pipeline 31, the other end is connected with feed water pipeline 4, and thermal power feed water pump 32 is arranged on feed water pipeline 4.
[0024] In an embodiment of the utility model, further include molten salt feed water heat exchanger 33, and molten salt feed water heat exchanger 33 and steam extraction feed water heat exchanger 30 are connected in parallel on feed water pipeline 4, molten salt feed water heat exchanger 33 is connected with feed water pipeline 4 and fifth molten salt pipeline 29 respectively, and nuclear island feed water pump 34 is arranged on the pipeline between steam extraction molten salt heat exchanger 3 and nuclear island steam generator 1.
[0025] In an embodiment of the utility model, the molten salt of first molten salt assembly adopts binary salt, and the molten salt of second molten salt assembly adopts ternary salt.
[0026] The process and purpose of the above technical solutions are introduced below.
[0027] 1) Molten salt heat absorption system
[0028] The high-temperature steam at the outlet of the nuclear island steam generator 1 enters the steam-molten salt heat exchanger 2 to heat the high-temperature zone molten salt and becomes a dry substance, the dry substance at the outlet of the steam-molten salt heat exchanger 2 enters the dry substance-molten salt heat exchanger 3 to heat the low-temperature zone molten salt and is cooled to the required water inlet temperature of the nuclear island steam generator 1, and then is pressurized by the nuclear island feedwater pump 34 and enters the nuclear island steam generator 1. The low-temperature binary salt in the high-temperature zone cold salt tank 11 is pressurized by the high-temperature zone cold salt pump 12 and enters the steam-molten salt heat exchanger 2, is heated by the high-temperature steam of the nuclear island, and is heated to a specified temperature by the molten salt electric heater 15 and enters the high-temperature zone hot salt tank 9. The low-temperature ternary salt in the low-temperature zone cold salt tank 26 is pressurized by the low-temperature zone cold salt pump 27 and enters the dry substance-molten salt heat exchanger 3, is heated to a specified temperature by the dry substance, and then enters the low-temperature zone hot salt tank 24.
[0029] In the system, a dual-temperature zone molten salt energy storage system including a high-temperature zone molten salt system and a low-temperature zone molten salt system is arranged, wherein the high-temperature zone molten salt medium adopts binary salt (for example, can include sodium nitrate with a mass fraction of 60% and potassium nitrate with a mass fraction of 40%), and the low-temperature zone molten salt medium adopts ternary salt (for example, can include sodium nitrate with a mass fraction of 7%, potassium nitrate with a mass fraction of 53%, and sodium nitrite with a mass fraction of 40%). The nuclear island reactor technology adopts a high-temperature gas-cooled reactor, and the outlet of the nuclear island steam generator is high-temperature and high-pressure steam. The high-temperature zone molten salt medium adopts binary salt, the binary salt has a high maximum use temperature and excellent stability at high temperatures, and after the latent heat of the high-pressure steam is fully utilized, the binary salt can be heated to a higher temperature by the molten salt electric heater to meet the temperature requirements of the main steam and the high-temperature reheat steam of the original thermal power generating unit. The low-temperature zone molten salt medium adopts ternary salt, the ternary salt has a lower melting point and can cool the feedwater entering the nuclear island steam generator to a required temperature without solidification. In summary, by reasonably configuring the capacities of the high-temperature zone and low-temperature zone cold salt pumps, the power of the molten salt heat absorption system can be matched with the power of the nuclear island reactor.
[0030] 2) Molten salt heat release system
[0031] The feed water of the original thermal power unit boiler inlet feed water pipeline 4 enters the molten salt feed water heat exchanger 33 after being warmed, enters the steam generation system, and passes through the preheater 18, the evaporator 17, and the superheater 16 in turn to be heated into high-temperature superheated steam by the molten salt, and enters the original thermal power main steam pipeline 21. The low-temperature reheat steam of the original thermal power cold section pipeline 22 enters the reheater and is heated into high-temperature reheat steam by the molten salt, and then enters the original thermal power hot section pipeline 23. The 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, and is divided into two routes, one of which enters the superheater 16, and the other of which enters the reheater 19. The two routes of molten salt are combined into one route after being cooled by steam, enter the evaporator 17 and the preheater 18 in turn, and are finally cooled into low-temperature binary salt and enter 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 divided into two routes, one of which enters the heating heater 7 to heat the heating primary network return water pipeline and then enters the heating primary network water supply pipeline to provide heat to the outside, and the other of which enters the molten salt feed water heat exchanger 33 to heat part of the deaerator feed water to reduce the heat recovery extraction steam. The two routes of molten salt are combined into one route after being cooled into low-temperature ternary salt and enter the low-temperature zone cold salt tank 26.
[0032] In the system, considering the anti-condensation problem of the low-temperature binary salt in the high-temperature zone, the steam molten salt heat exchanger 2 outlet drain water temperature is relatively high, by setting the low-temperature zone molten salt system and setting the heating heater 7 and the molten salt feed water heat exchanger 33, the steam molten salt heat exchanger 2 outlet drain water heat can be fully utilized to heat the heating network return water and part of the deaerator feed water, to reduce the drain water temperature, to realize external heating, to reduce the heat recovery extraction steam, and to improve the system power generation capacity. At the same time, according to the heating demand and the steam turbine power demand, the low-temperature molten salt amount entering the heating heater 7 and the molten salt feed water heat exchanger 33 can be adjusted, and by reasonably configuring the high-temperature zone and low-temperature zone hot salt pump capacity, the molten salt heat release system power can be matched with the original thermal power steam turbine power and the heating load.
[0033] 3) Steam turbine generator system
[0034] The original thermal power steam turbine generator system remains unchanged, the molten salt heat release system enters the original thermal power main steam pipeline 21 from the high-temperature high-pressure main steam, and then enters the original steam turbine high-pressure cylinder to drive the steam turbine to generate electricity. The steam turbine high-pressure cylinder exhaust enters the molten salt heat release system reheater 19 through the original thermal power cold section pipeline 22, is heated into high-temperature reheat steam, and then enters the original thermal power hot section pipeline 23, and then enters the original thermal power steam turbine medium-pressure cylinder to drive the steam turbine to generate electricity. The original thermal power feed water pump outlet feed water is divided into two routes, one of which enters the original thermal power extraction feed water heat exchanger 30 to be heated and warmed by the extraction steam, and the other of which enters the molten salt feed water heat exchanger 33 to be heated and warmed by the low-temperature zone molten salt. The two routes of feed water are heated to the same temperature and then enter the molten salt heat release system.
[0035] In the system, the water flow into the original extraction steam water heater 30 and the molten salt water heater 33 can be adjusted according to the low-temperature zone molten salt heat storage capacity and the steam turbine power, and the steam turbine extraction steam amount can be reduced to increase the steam turbine power generation.
[0036] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.
[0037] Finally, it should be noted that the above-described embodiments are merely preferred embodiments of the present application, and are only used to explain the technical scheme of the present application, and are not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims
1. A generator unit that can be converted from a thermal power plant to a nuclear power plant, taking into account both peak-shaving and heating needs, characterized in that: The nuclear island steam generator (1), the steam molten salt heat exchanger (2), the water molten salt heat exchanger (3), the first molten salt assembly, the second molten salt assembly, the heat exchange assembly, the feedwater pipe (4), the steam turbine (5), the generator (6), the heating heater (7) and the heating primary network pipe (8), the steam molten salt heat exchanger (2) is connected with 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) into the molten salt of the first molten salt assembly, the water molten salt heat exchanger (3) is connected with the steam molten salt heat exchanger (2) and the second molten salt assembly respectively, for storing the water heat of the steam molten salt heat exchanger (2) into the molten salt of the second molten salt assembly, the heat exchange assembly is connected with the first molten salt assembly and the feedwater pipe (4) respectively, the steam turbine (5) is connected with the heat exchange assembly through the steam pipe, the steam turbine (5) is connected with the generator (6), the heating heater (7) is connected with the second molten salt assembly and the heating primary network pipe (8) respectively, for transmitting the molten salt heat of the second molten salt assembly to the heating primary network pipe (8).
2. The combined peak shaving and heat supply thermal power plant converted into a nuclear power plant of 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 pump (10) is arranged in the high-temperature zone hot salt tank (9), the high-temperature zone cold salt pump (12) is arranged in the high-temperature zone cold salt tank (11), the high-temperature zone hot salt tank (9) and the high-temperature zone cold salt tank (11) are connected through a first molten salt pipe (13) and a second molten salt pipe (14), the high-temperature zone cold molten salt enters the high-temperature zone hot salt tank (9) from the high-temperature zone cold salt tank (11) through the first molten salt pipe (13), the high-temperature zone hot molten salt enters the high-temperature zone cold salt tank (11) from the high-temperature zone hot salt tank (9) through the second molten salt pipe (14), the steam molten salt heat exchanger (2) is arranged on the first molten salt pipe (13), and the heat exchange assembly is arranged on the second molten salt pipe (14).
3. The combined peak shaving and heat supply thermal power plant converted into a nuclear power plant of claim 2, characterized in that, The first molten salt assembly further includes a molten salt electric heater (15), the molten salt electric heater (15) is arranged on the first molten salt pipe (13) and located between the steam molten salt heat exchanger (2) and the high-temperature zone hot salt tank (9).
4. The combined peak-shaving and heat-supply thermal power plant converted into a nuclear power plant of claim 3, characterized in that, The heat exchange assembly includes a superheater (16), an evaporator (17) and a preheater (18) arranged in sequence along the flow direction of the hot molten salt, and the preheater (18), the evaporator (17) and the superheater (16) are arranged in sequence along the flow direction of the feedwater, and the outlet of the superheater (16) is connected with the steam turbine (5).
5. The combined peak-shaving and heat-supply thermal power plant converted into a nuclear power plant of claim 4, characterized in that, The heat exchange assembly further comprises a reheater (19), the second molten salt pipeline (14) is further connected in parallel with a third molten salt pipeline (20), the reheater (19) is arranged on the third molten salt pipeline (20), the steam turbine (5) comprises a high-pressure cylinder and a medium-pressure cylinder, the outlet of the superheater (16) is connected with the inlet of the high-pressure cylinder through a thermal power main steam pipeline (21), the outlet of the high-pressure cylinder is connected with the inlet of the reheater (19) through a thermal power cold section pipeline (22), and the outlet of the reheater (19) is connected with the inlet of the medium-pressure cylinder through a thermal power hot section pipeline (23).
6. The combined peak shaving and heat supply thermal power plant converted into a nuclear power plant of claim 5, characterized in that, The inlet of the third molten salt pipeline (20) is arranged at the inlet of the superheater (16), and the outlet of the third molten salt pipeline (20) is arranged between the superheater (16) and the evaporator (17).
7. The combined peak-shaving and heat-supply thermal power plant converted into a nuclear power plant of claim 5, characterized in that, The second molten salt assembly comprises 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 pump (25) is arranged in the low-temperature zone hot salt tank (24), the low-temperature zone cold salt pump (27) is arranged in the low-temperature zone cold salt tank (26), the low-temperature zone hot salt tank (24) and the low-temperature zone cold salt tank (26) are connected through a fourth molten salt pipeline (28) and a fifth molten salt pipeline (29), low-temperature zone cold molten salt enters the low-temperature zone hot salt tank (24) from the low-temperature zone cold salt tank (26) through the fourth molten salt pipeline (28), and low-temperature zone hot molten salt enters the low-temperature zone cold salt tank (26) from the low-temperature zone hot salt tank (24) through the fifth molten salt pipeline (29), and the heating heater (7) is connected with the fifth molten salt pipeline (29).
8. The combined peak-shaving and heat-supply thermal power plant converted into a nuclear power plant of claim 7, characterized in that, The steam extraction feedwater heat exchanger (30) is connected with the high-pressure cylinder through a steam extraction pipeline (31) at one end and connected with the feedwater pipeline (4) at the other end, and a thermal power feedwater pump (32) is arranged on the feedwater pipeline (4).
9. The combined peak-shaving and heat-supply thermal power plant converted into a nuclear power plant of claim 8, characterized in that, The molten salt feedwater heat exchanger (33) is connected with the feedwater pipeline (4) and the fifth molten salt pipeline (29) respectively, and a nuclear island feedwater pump (34) is arranged on a pipeline between the drain molten salt heat exchanger (3) and the nuclear island steam generator (1).
10. The combined peak-shaving heat-supply and thermal power-to-nuclear power plant conversion power generating unit according to any of claims 1-9, 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.