Nuclear energy heating system coupled with molten salt energy storage, and heating method thereof

Abstract

The present invention relates to the technical field of peak regulation of nuclear energy heating systems. Disclosed are a nuclear energy heating system coupled with molten salt energy storage, and a heating method thereof. The system comprises a reactor, an intermediate loop, a heat utilization loop, a molten salt loop, and a molten salt-heating network loop; the intermediate loop comprises an intermediate loop-molten salt heat exchanger; the heat utilization loop comprises a primary heat user and a centralized heating network; the molten salt loop comprises a molten salt storage tank; the molten salt-heating network loop comprises a molten salt side heating network heat exchanger; when the heat used by the primary heat user is low, the reactor transfers part of heat to the molten salt storage tank in the molten salt loop by means of the intermediate loop-molten salt heat exchanger for temporary storage; when the heat demand of the centralized heating network is high, the heat stored in the molten salt storage tank is transferred into the centralized heating network. The molten salt energy storage loop of the present invention stores redundant heat when the heat demand of a user is low, and uses the heat for peak regulation in a loop with large heat demand fluctuation, thereby improving the flexibility of a nuclear energy system during heating.

Description

A nuclear energy heating system coupled with molten salt energy storage and a heating method thereof Technical Field

[0001] The present invention relates to the technical field of peak regulation of nuclear energy heating systems, and in particular to a nuclear energy heating system coupled with molten salt energy storage and a heating method thereof. Background Art

[0002] With the continuous development of nuclear energy technology, comprehensive forms of nuclear energy utilization, such as nuclear heating, have garnered increasing attention. Currently, nuclear heating systems are relatively mature, with widespread implementation in both nuclear power plants for cogeneration and dedicated nuclear heating reactors for district heating. Currently, three main types of nuclear heating reactors are commonly used: shell-type reactors, pool-type reactors, and combined pool-shell reactors. Shell-type reactors, due to their pressurized primary circuit operation and the resulting higher primary coolant temperature, are widely used in heating applications and have garnered considerable attention.

[0003] Because nuclear heating systems operate differently from nuclear power plants, the heat load required by the heating network may fluctuate frequently during operation based on current weather conditions (or heat demand from heat users). This places higher demands on the peak-shaving capacity of nuclear heating systems. However, current nuclear heating systems generally have poor peak-shaving capabilities, and most operate in baseload mode. Providing peak-shaving heat through other heat sources would inevitably lead to nuclear heating systems becoming dependent on other energy sources (mostly fossil fuels), significantly limiting their application and further development.

[0004] Therefore, there is an urgent need in this field for a nuclear energy heating system that has peak-shaving capability without relying on other energy sources. Summary of the Invention

[0005] The purpose of the present invention is to provide a nuclear energy heating system and a heating method thereof, which utilizes a molten salt energy storage system to absorb excess heat output from a nuclear energy heating reactor when heat demand from heat users is low, and temporarily stores it. When heat demand from heat users is high, the heat stored in the molten salt energy storage system is released back to the heating network to make up for the heat gap during this period, thereby enabling the nuclear energy heating system to have a certain peak-shaving heating capacity, and having higher flexibility and a wider range of applications when used for heating.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] In a first aspect, the present invention provides a nuclear energy heating system coupled with molten salt energy storage, comprising: a reactor, an intermediate loop, a heat utilization loop, a molten salt loop, and a molten salt-heat network loop;

[0008] The intermediate loop comprises at least: an intermediate loop-molten salt heat exchanger;

[0009] The heat circuit includes at least: a primary heat user and a centralized heating network;

[0010] The molten salt circuit comprises at least: a molten salt storage tank;

[0011] The molten salt-heat network loop includes: a molten salt side heat network heat exchanger;

[0012] The reactor is connected to the primary heat user; the reactor is connected to the molten salt storage tank via the intermediate loop-molten salt heat exchanger; the reactor is connected to the central heating network; the molten salt storage tank is connected to the central heating network;

[0013] The reactor is used for:

[0014] When responding to a first control instruction, the generated heat is delivered to a primary heat user; the first control instruction is an instruction indicating that the heat demand of the primary heat user is higher than a first set threshold;

[0015] When responding to the second control instruction, part of the generated heat is delivered to the primary heat user, and the other part of the heat is transferred to the molten salt storage tank in the molten salt circuit through the intermediate circuit-molten salt heat exchanger; the second control instruction is an instruction indicating that the heat demand of the primary heat user is equal to or lower than the first set threshold;

[0016] The molten salt storage tank is used to transfer the stored heat to the centralized heating network when responding to a third control instruction; the third control instruction is an instruction indicating that the heat demand of the centralized heating network is higher than a second set threshold.

[0017] Optionally, the reactor includes: a core body, a primary side of a main heat exchanger, and a reactor pressure vessel;

[0018] The core body, the primary side of the main heat exchanger and the reactor pressure vessel are connected in sequence to form a loop.

[0019] Optionally, the intermediate loop further includes: a secondary side of a main heat exchanger, a pressure stabilizer, a first intermediate loop pump, a second intermediate loop pump, an intermediate loop main valve, an intermediate loop isolation valve, an intermediate-molten salt loop valve, and a primary side of a steam generator;

[0020] The secondary side outlet of the main heat exchanger is connected to the primary side inlet of the steam generator, and a pressure stabilizer connecting pipe is provided on the intermediate pipe section between the secondary side outlet of the main heat exchanger and the primary side inlet of the steam generator, and the pressure stabilizer connecting pipe is connected to the pressure stabilizer;

[0021] The steam generator primary side outlet is connected to the first intermediate circuit pump inlet; an intermediate circuit isolation valve is provided on the pipe section between the pressure stabilizer connecting pipe and the steam generator primary side inlet and on the pipe section between the steam generator primary side outlet and the first intermediate circuit pump inlet;

[0022] The outlet of the first intermediate circuit pump is connected to the inlet of the intermediate circuit main valve, and the outlet of the intermediate circuit main valve is connected to the secondary side inlet of the main heat exchanger; a second intermediate circuit pump is provided on the pipe section between the secondary side outlet of the main heat exchanger and the pressure stabilizer connecting pipe;

[0023] The second intermediate loop pump outlet is connected to the intermediate-molten salt loop valve, the intermediate-molten salt loop valve is connected to the primary side inlet of the intermediate loop-molten salt heat exchanger, and the primary side outlet of the intermediate loop-molten salt heat exchanger is connected to the pipe section between the intermediate loop main valve and the secondary side inlet of the main heat exchanger.

[0024] Optionally, the heat circuit further includes: a secondary side of a steam generator, a heat circuit isolation valve, a heat circuit pump, a primary side of a heat network heat exchanger on the nuclear side, and a secondary side of a heat circuit heat exchanger on the molten salt side;

[0025] Among them, the secondary side outlet of the steam generator is connected to the inlet of the heat pipe of the first-level heat user, the outlet of the heat pipe of the first-level heat user is connected to the primary side inlet of the nuclear side heat network heat exchanger, the primary side outlet of the nuclear side heat network heat exchanger is connected to the inlet of the heat circuit pump, the outlet of the heat circuit pump is connected to the secondary side inlet of the heat circuit heat exchanger on the molten salt side, and the secondary side outlet of the heat circuit heat exchanger on the molten salt side is connected to the secondary side inlet of the steam generator.

[0026] Optionally, the molten salt storage tank includes: a cold salt storage tank and a hot salt storage tank;

[0027] The molten salt circuit also includes: a secondary heater primary side, a preheating heater primary side, a first molten salt circuit pump, an intermediate circuit-molten salt heat exchanger secondary side, a molten salt circuit main valve, an electric heater to molten salt circuit valve, an electric heater to molten salt circuit pump, an electric heater, an electric heating-molten salt-heating network circuit valve and a second molten salt circuit pump;

[0028] Among them, the outlet of the cold salt storage tank is connected to the first molten salt loop pump, the first molten salt loop pump is connected to the secondary side inlet of the intermediate loop-molten salt heat exchanger, the secondary side outlet of the intermediate loop-molten salt heat exchanger is connected to the molten salt loop main valve, the outlet of the molten salt loop main valve is connected to the hot salt storage tank, the outlet of the hot salt storage tank is connected to the second molten salt loop pump, the outlet of the second molten salt loop pump is connected to the primary side inlet of the secondary heater, the primary side outlet of the secondary heater is connected to the primary side inlet of the preheating heater, and the primary side outlet of the preheating heater is connected to the inlet of the cold salt storage tank; the outlet of the electric heater is connected to the electric heater to molten salt loop pump, the outlet of the electric heater to molten salt loop pump is connected to the hot salt storage tank through the electric heater to molten salt loop valve, an opening of the hot salt storage tank is connected to the hot salt storage tank-cold salt storage tank valve, and the hot salt storage tank-cold salt storage tank valve is connected to the cold salt storage tank; the outlet of the electric heater to molten salt loop pump is connected to the electric heater-molten salt-heating network loop valve.

[0029] Optionally, the temperature of the molten salt in the cold salt storage tank is 150-180°C, and the temperature of the molten salt in the hot salt storage tank is 200-250°C.

[0030] Optionally, the molten salt-heating network loop further includes: a primary side of a heat circuit heat exchanger on the molten salt side, a primary side of a heat network heat exchanger on the molten salt side, an isolation valve for the heat network heat exchanger on the molten salt side, an isolation valve for the heat circuit heat exchanger on the molten salt side, a main valve of the molten salt-heating network loop, a molten salt-heating network loop pump, a secondary side of a secondary heater, and a secondary side of a preheating heater;

[0031] Among them, the secondary side outlet of the secondary heater is connected to the molten salt-heat network loop pump, the molten salt-heat network loop pump is connected to the molten salt-heat network loop main valve, the molten salt-heat network loop main valve is connected to the primary side inlet of the molten salt side heat circuit heat exchanger, the primary side outlet of the molten salt side heat circuit heat exchanger is connected to the primary side inlet of the molten salt side heat network heat exchanger, the primary side outlet of the molten salt side heat network heat exchanger is connected to the secondary side inlet of the preheating heater, and the secondary side outlet of the preheating heater is connected to the secondary side inlet of the secondary heater; the molten salt side heat circuit heat exchanger isolation valve isolates the molten salt side heat circuit heat exchanger from the molten salt-heat network loop, and the molten salt side heat network heat exchanger isolation valve isolates the molten salt side heat network heat exchanger from the molten salt-heat network loop.

[0032] Optionally, the primary heat user is a plant that produces and processes urea or vinyl chloride.

[0033] In a second aspect, the present invention provides a nuclear energy heating method applied to a nuclear energy heating system as described above, the method comprising:

[0034] Obtain the heat consumption of primary heat users and the heat demand of the central heating network;

[0035] When responding to a first control instruction, the heat generated by the reactor is delivered to the primary heat user; the first control instruction is an instruction indicating that the heat demand of the primary heat user is higher than a first set threshold;

[0036] In response to a second control instruction, a portion of the heat generated by the reactor is delivered to the primary heat user, and the remaining heat is transferred to the molten salt storage tank in the molten salt circuit through the intermediate circuit-molten salt heat exchanger; the second control instruction is an instruction indicating that the heat demand of the primary heat user is equal to or lower than the first set threshold;

[0037] When responding to the third control instruction, the heat stored in the molten salt storage tank is transferred to the centralized heating network; the third control instruction is an instruction indicating that the heat demand of the centralized heating network is higher than the second set threshold.

[0038] Optionally, before the system starts, it also includes:

[0039] Start the electric heater in the molten salt circuit;

[0040] The electric heater is used to pump the heating gas in the molten salt loop to the molten salt loop valve of the electric heater and enter the hot salt storage tank to heat the molten salt in the hot salt storage tank;

[0041] The heated gas enters the cold salt storage tank through the hot salt storage tank-cold salt storage tank valve, continues to heat the molten salt in the cold salt storage tank, and finally returns to the electric heater.

[0042] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0043] The present invention provides a nuclear energy heat supply system and a heat supply method, which comprises: a nuclear energy heat supply system, characterized in that it comprises: a reactor, an intermediate loop, a heat supply loop, a molten salt loop and a molten salt-heat network loop; the intermediate loop at least comprises: an intermediate loop-molten salt heat exchanger; the heat supply loop at least comprises: a primary heat user and a centralized heating network; the molten salt loop at least comprises: a molten salt storage tank; the molten salt-heat network loop comprises: a molten salt side heat network heat exchanger; wherein, the reactor is connected to the primary heat user; the reactor is connected to the molten salt storage tank via the intermediate loop-molten salt heat exchanger; the reactor is connected to the centralized heating network; the molten salt storage tank is connected to the centralized heating network The reactor is configured to: when responding to a first control instruction, deliver the generated heat to a primary heat user; the first control instruction is an instruction indicating that the heat demand of the primary heat user is higher than a first set threshold; when responding to a second control instruction, deliver a portion of the generated heat to the primary heat user, and transfer the remaining heat to a molten salt storage tank in the molten salt circuit via an intermediate circuit-molten salt heat exchanger; the second control instruction is an instruction indicating that the heat demand of the primary heat user is equal to or lower than the first set threshold; the molten salt storage tank is configured to, when responding to a third control instruction, deliver the stored heat to a centralized heating network; the third control instruction is an instruction indicating that the heat demand of the centralized heating network is higher than a second set threshold. The molten salt energy storage circuit proposed in the present invention can store excess heat generated by the reactor when the heat demand of the heat user is low, and use this heat for peak load regulation in circuits with large fluctuations in heat demand, thereby improving the flexibility of the nuclear energy system in heat supply. Compared with the baseload operation mode commonly used in current nuclear energy heating systems, this mode can eliminate the nuclear energy heating system's dependence on other heat sources and improve its heating flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] FIG1 is a schematic structural diagram of a nuclear energy heating system provided in Example 1 of the present invention;

[0046] FIG2 is a flow chart of a nuclear energy heating method of a nuclear energy heating system provided in Example 2 of the present invention.

[0047] Explanation of symbols: Reactor core—1; Main heat exchanger—2; Reactor pressure vessel—3; Pressurizer—4; First intermediate circuit pump—5; Second intermediate circuit pump—6; Intermediate circuit main valve—7; Intermediate circuit isolation valve—8; Steam generator—9; Heat supply circuit isolation valve—10; Nuclear side heat network heat exchanger—11; Molten salt side heat network heat exchanger—12; Heat supply circuit pump—13; Central heating network circuit main valve—14; Molten salt side heat network heat exchanger—15; Central heating network pump—16; Molten salt side heat network heat exchanger isolation valve—17; Molten salt side heat supply circuit heat exchanger isolation valve—18; Molten salt-heat network circuit main valve—19; Molten salt-heat network circuit pump —20; secondary heater—21; preheating heater—22; cold salt storage tank—23; first molten salt circuit pump—24; intermediate circuit-molten salt heat exchanger—25; molten salt circuit main valve—26; electric heater to molten salt circuit valve—17; electric heater to molten salt circuit pump—28; electric heater—19; electric heater-molten salt-heating network circuit valve—30; hot salt storage tank—31; hot salt storage tank-cold salt storage tank valve—32; second molten salt circuit pump—33; intermediate circuit-molten salt circuit valve—34; first-level heat user—35; centralized heating network—36. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] Based on the shortcomings of existing technologies, designing a feasible nuclear energy heating system with peak-shaving capability has become a major development direction of nuclear energy heating systems.

[0050] This invention aims to design a nuclear heating system with peak-shaving capabilities. To achieve this goal, a nuclear heating system coupled with molten salt energy storage is designed. The molten salt energy storage system absorbs excess heat output from the nuclear heating reactor during periods of low heat demand and temporarily stores it. When demand increases, the stored heat is released back into the heating network to fill the heat gap during that period. This operating method enables the nuclear heating system to possess a certain degree of peak-shaving heating capacity, providing greater flexibility and a wider range of applications for heating.

[0051] The purpose of the present invention is to provide a nuclear energy heating system and a heating method thereof, which utilizes a molten salt energy storage system to absorb excess heat output from a nuclear energy heating reactor when heat demand from heat users is low, and temporarily stores it. When heat demand from heat users is high, the heat stored in the molten salt energy storage system is released back to the heating network to make up for the heat gap during this period, thereby enabling the nuclear energy heating system to have a certain peak-shaving heating capacity, and having higher flexibility and a wider range of applications when used for heating.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] Example 1

[0054] As shown in Figure 1, this embodiment provides a nuclear energy heating system, including a reactor, an intermediate circuit, a heat supply circuit, a molten salt circuit, and a molten salt-heating network circuit. In Figure 1, the thick dashed line in the heat supply circuit represents steam generated by a steam generator, and the thin dashed line in the molten salt circuit represents gas generated by an electric heater for heating the molten salt.

[0055] Among them, the intermediate circuit at least includes: an intermediate circuit-molten salt heat exchanger 25; the heat circuit at least includes: a primary heat user 35 and a centralized heating network 36; the molten salt circuit at least includes: a molten salt storage tank; the molten salt-heat network circuit includes: a molten salt side heat network heat exchanger 15.

[0056] The reactor 1 is connected to the primary heat user 35; the reactor is connected to the molten salt storage tank via the intermediate loop-molten salt heat exchanger 25; the reactor is connected to the centralized heating network 36; and the molten salt storage tank is connected to the centralized heating network 36 via the molten salt-side network heat exchanger. The heat-using circuit includes the primary heat user and the centralized heating network. The network is primarily connected to the heat-using circuit. Even when the molten salt is not in use, the working fluid of the heat-using circuit is used to heat the network. The molten salt acts as a secondary heater, increasing the input power of the heating network.

[0057] The reactor is used for:

[0058] When responding to a first control instruction, the generated heat is delivered to the primary heat user 35; the first control instruction is an instruction indicating that the heat demand of the primary heat user 35 is higher than a first set threshold;

[0059] When responding to the second control instruction, part of the generated heat is delivered to the primary heat user 35, and the other part of the heat is transferred to the molten salt storage tank in the molten salt circuit through the intermediate circuit-molten salt heat exchanger 25; the second control instruction is an instruction indicating that the heat demand of the primary heat user 35 is equal to or lower than the first set threshold.

[0060] The molten salt storage tank is used to transfer the stored heat to the centralized heating network 36 when responding to a third control instruction; the third control instruction is an instruction indicating that the heat demand of the centralized heating network 36 is higher than a second set threshold.

[0061] The first and second thresholds are determined based on actual conditions. When using this nuclear energy heating system for heat supply (including industrial and district heating), when heat demand from primary heat users is high, the reactor output power is increased to meet the heat demand. When heat demand from primary heat users is low, the reactor can transfer some heat to the molten salt circuit for temporary storage through the intermediate circuit-molten salt heat exchanger without changing power. When the heat demand of the district heating network is high (and cannot be met solely by return steam from primary heat users), the heat stored in the molten salt is transferred to the district heating network via the molten salt-to-heat network circuit to meet the heat demand. Furthermore, the presence of the molten salt circuit allows the molten salt to absorb excess heat from the reactor, further improving the reactor's load absorption capacity. Furthermore, the heat from the molten salt circuit can be used to preheat the working fluid in the heat-using circuit, thereby improving the thermal efficiency of the heat-using circuit.

[0062] Specifically:

[0063] The reactor consists of a primary circuit system consisting of a core body 1, a primary side of a main heat exchanger 2, and a coolant in a reactor pressure vessel 3.

[0064] The intermediate circuit mainly includes the secondary side of the main heat exchanger 2, the pressure stabilizer 4, the first intermediate circuit pump 5, the second intermediate circuit pump 6, the intermediate circuit main valve 7, the intermediate circuit isolation valve 8, the intermediate-molten salt circuit valve 34, the primary side of the intermediate circuit-molten salt heat exchanger 25 and the primary side of the steam generator 9.

[0065] Among them, the secondary side outlet of the main heat exchanger 2 is connected to the primary side inlet of the steam generator 9, and a pressure stabilizer connecting pipe is provided in the intermediate pipe section. The pressure stabilizer 4 is connected to the intermediate circuit through this branch pipe. The primary side outlet of the steam generator 9 is connected to the inlet of the first intermediate circuit pump 5. The intermediate circuit isolation valve 8 is connected between the pressure stabilizer connecting pipe and the primary side inlet of the steam generator 9 and the primary side outlet of the steam generator 9 and the inlet of the first intermediate circuit pump 5. The outlet of the first intermediate circuit pump 5 is connected to the inlet of the intermediate circuit main valve 7, and the outlet of the intermediate circuit main valve 7 is connected to the secondary side inlet of the main heat exchanger 2. A branch pipe is led out between the secondary side outlet of the main heat exchanger 2 and the pressure stabilizer connecting pipe and connected to the second intermediate circuit pump 6. The outlet of the second intermediate circuit pump 6 is connected to the intermediate-molten salt circuit valve 34, which is connected to the primary side inlet of the intermediate circuit-molten salt heat exchanger 25. The primary side outlet of the intermediate circuit-molten salt heat exchanger 25 is connected to the pipe section between the intermediate circuit main valve 7 and the secondary side inlet of the main heat exchanger 2.

[0066] The heat circuit mainly includes the secondary side of the steam generator 9, the heat circuit isolation valve 10, the primary heat user 35, the centralized heating network 36, the heat circuit pump 13, the primary side of the nuclear side heat network heat exchanger 11 and the secondary side of the molten salt side heat circuit heat exchanger 12.

[0067] Among them, the secondary side outlet of the steam generator 9 is connected to the inlet of the heat pipe of the primary heat user 35, the heat pipe outlet of the primary heat user 35 is connected to the primary side inlet of the core-side heat network heat exchanger 11, the primary side outlet of the core-side heat network heat exchanger 11 is connected to the inlet of the heat circuit pump 13, the outlet of the heat circuit pump 13 is connected to the secondary side inlet of the molten salt side heat circuit heat exchanger 12, and the secondary side outlet of the molten salt side heat circuit heat exchanger 12 is connected to the secondary side inlet of the steam generator 9.

[0068] The molten salt circuit mainly includes a cold salt storage tank 23, a hot salt storage tank 31, a first molten salt circuit pump 24, a second molten salt circuit pump 33, an electric heater to molten salt circuit pump 28, a molten salt circuit main valve 26, an electric heater to molten salt circuit valve 27, an electric heating-molten salt-heating network circuit valve 30, an electric heater 29, an intermediate circuit-molten salt heat exchanger 25 secondary side, a preheating heater 22 primary side and a secondary heater 21 primary side.

[0069] Among them, the molten salt storage tank includes: a cold salt storage tank 23 and a hot salt storage tank 24; the outlet of the cold salt storage tank 23 is connected to the first molten salt loop pump 24, the first molten salt loop pump 24 is connected to the secondary side inlet of the intermediate loop-molten salt heat exchanger 25, the secondary side outlet of the intermediate loop-molten salt heat exchanger 25 is connected to the molten salt loop main valve 26, the outlet of the molten salt loop main valve 26 is connected to the hot salt storage tank 31, the hot salt storage tank outlet is connected to the second molten salt loop pump 33, the outlet of the second molten salt loop pump 33 is connected to the primary side inlet of the secondary heater 21, the primary side outlet of the secondary heater 21 is connected to the primary side inlet of the preheating heater 22, and the primary side outlet of the preheating heater 22 is connected to the inlet of the cold salt storage tank 23; in addition, the outlet of the electric heater 29 is connected to the electric heater to the molten salt The salt circuit pump 28 is connected, a branch pipe from the electric heater to the molten salt circuit pump 28 outlet is connected to the electric heater to the molten salt circuit valve 27, and is connected to the hot salt storage tank 31 through the electric heater to the molten salt circuit valve 27, an opening of the hot salt storage tank 31 is connected to the hot salt storage tank-cold salt storage tank valve 32, the hot salt storage tank-cold salt storage tank valve 32 is connected to the cold salt storage tank 23, and after flowing out of the cold salt storage tank 23, it finally returns to the electric heater 29; another branch pipe from the electric heater to the molten salt circuit pump 28 outlet is connected to the electric heater-molten salt-heating network circuit valve 30, and from the electric heater-molten salt-heating network circuit valve 30 outlet it enters the primary side spare inlet of the secondary heater 21 and the primary side spare inlet of the preheating heater 22 in sequence and finally returns to the electric heater 29.

[0070] The molten salt-heating network loop mainly includes the secondary side of the preheating heater 22, the secondary side of the secondary heater 21, the primary side of the molten salt side heat circuit heat exchanger 12, the primary side of the molten salt side heat network heat exchanger 15, the molten salt-heating network loop pump 20, the molten salt side heat network heat exchanger isolation valve 17, the molten salt side heat circuit heat exchanger isolation valve 18 and the molten salt-heating network loop main valve 19.

[0071] The secondary outlet of the secondary heater 21 is connected to the molten salt-heating network circuit pump 20, which is connected to the molten salt-heating network circuit main valve 19. The molten salt-heating network circuit main valve 19 is connected to the primary inlet of the molten salt-side heat circuit heat exchanger 12. The primary outlet of the molten salt-side heat circuit heat exchanger 12 is connected to the primary inlet of the molten salt-side heat network heat exchanger 15. The primary outlet of the molten salt-side heat network heat exchanger 15 is connected to the secondary inlet of the preheating heater 22, and the secondary outlet of the preheating heater 22 is connected to the secondary inlet of the secondary heater 21. In addition, the molten salt-side heat circuit heat exchanger isolation valve 18 can isolate the molten salt-side heat circuit heat exchanger 12 from the molten salt-heating network circuit, and the molten salt-side heat network heat exchanger isolation valve 17 can isolate the molten salt-side heat network heat exchanger 15 from the molten salt-heating network circuit.

[0072] During system operation, the intermediate circuit fluid, which absorbs heat and rises in temperature in the main heat exchanger 2, flows along the pipeline and, according to the designed operating conditions, enters the primary side of the steam generator 9 and the primary side of the intermediate circuit-molten salt heat exchanger 25. In the first and third operating conditions, after exchanging heat in the primary side of the steam generator 9, the intermediate circuit fluid, driven by the first intermediate circuit pump 5, returns to the main heat exchanger 2. In the second operating condition, after exchanging heat with molten salt in the primary side of the intermediate circuit-molten salt heat exchanger 25, the intermediate circuit fluid merges with the intermediate circuit main pipeline through the outlet branch of the primary side of the intermediate circuit-molten salt heat exchanger 25 and enters the main heat exchanger 2. In the molten salt circuit, the cooler molten salt in the cold salt storage tank 23, driven by the first molten salt circuit pump 24, flows out of the tank and enters the secondary side of the intermediate circuit-molten salt heat exchanger 25, where it absorbs heat and rises in temperature. The heated molten salt flows into the hot salt storage tank 31, where the hotter molten salt is stored and used for various thermal purposes. In this system design, molten salt in hot salt storage tank 31 flows out of it, driven by second molten salt circuit pump 33, into the primary side of secondary heater 21, where it exchanges heat with the working fluid in the molten salt-heating network circuit. After heat exchange, the molten salt enters the primary side of preheat heater 22, where it continues to exchange heat with the working fluid in the molten salt-heating network circuit, and ultimately returns to cold salt storage tank 23.

[0073] The working fluid on the secondary side of steam generator 9 absorbs heat from the primary side, vaporizing there. The resulting steam is used for various thermal purposes (transported via pipelines to primary heat users 35). After releasing heat there, the return steam is piped to the primary side of the core-side heat network heat exchanger 11 for heat exchange (heat release) with the centralized heating network 36. After heat exchange there, the return steam condenses into water and, driven by the heat circuit pump 13, enters the secondary side of the molten salt-side heat circuit heat exchanger 12. The working fluid in the molten salt-heat network circuit heats the water in the heat circuit, and the heated heat circuit working fluid is then transported to the secondary side of steam generator 9, completing a cycle.

[0074] In the molten salt loop, the hot molten salt releases heat in the secondary heater 21 and preheating heater 22. In the molten salt-heating network loop, the working fluid in this loop flows in the opposite direction to the molten salt in the molten salt loop, first entering the preheating heater 22 for the first heating. The heated working fluid then enters the secondary heater 21 for further heating. Driven by the molten salt-heating network loop pump 20, it enters the molten salt-side heat circuit heat exchanger 12 to heat the water in the heat circuit. The working fluid flowing out of the molten salt-side heat circuit heat exchanger enters the molten salt-heating network heat exchanger 15 to exchange heat with the centralized heating network 36. On the centralized heating network side, its heat input is the heat of the heat circuit return water transferred by the core-side heat network heat exchanger 11 and the heat of the molten salt-heating network loop transferred by the molten salt-heating network heat exchanger 15. Driven by the centralized heating network pump 16, the working fluid in this loop enters the heat user for heat exchange.

[0075] The molten salt used in the molten salt heat storage circuit is low-temperature molten salt. The temperature of the molten salt in the cold salt storage tank 23 is 150-180°C, and the temperature of the molten salt in the hot salt storage tank 31 is 200-250°C.

[0076] The core-side heat network heat exchanger 11 acts as a condenser in the heat-using circuit. The steam exhausted by the primary heat user is condensed into water in the primary side of the heat exchanger to be circulated in the subsequent heat-using circuit.

[0077] The function of the heat exchanger 12 on the molten salt side heat circuit is to heat the water in the heat circuit so as to preheat the water before entering the steam generator 9 , thereby improving the heating efficiency of the heat circuit.

[0078] The molten salt side heat circuit heat exchanger isolation valve 18 can isolate the molten salt side heat circuit heat exchanger 12 from the molten salt-heat network circuit. After the valve is opened, the working fluid in the molten salt-heat network circuit will no longer flow through the molten salt side heat circuit heat exchanger 12 (or the flow rate will be reduced), and all (most) of the heat will be exchanged in the molten salt side heat network heat exchanger; the function of the molten salt side heat network heat exchanger isolation valve 17 is the same as that of the molten salt side heat circuit heat exchanger isolation valve 18.

[0079] The steam generator 9 generates saturated steam at approximately 200°C. Its primary heat user can be a plant producing or processing urea or vinyl chloride. The return steam from this primary heat user has a temperature of 100-150°C and is condensed into water in the core-side heat network heat exchanger 11.

[0080] The central heating network requires water temperature of 60-120°C, and the specific required water temperature depends on the actual heating form and heat use purpose of the heating network.

[0081] The electric heater 29 is powered by an external generator and has two main functions:

[0082] First, the molten salt is preheated before use. A certain amount of gas is stored in the electric heater, which heats and melts the molten salt in the circuit. The gas is then transported through the electric heater to the molten salt circuit valve 27 to the hot salt storage tank 31, where it further melts the molten salt. The gas is then transported through the hot salt storage tank-cold salt storage tank valve 32 to the cold salt storage tank, where the cold salt is melted, and finally returns to the electric heater (the dotted line in Figure 1 represents the gas pipeline).

[0083] Second, at system startup, when the amount of hot molten salt is low and cannot meet the needs of the centralized heating network, electric heaters are used to heat the molten salt to meet the initial heating demand. Molten salt enters the electric heater from the cold salt storage tank. There, the heater passes through valve 30 in the electric heater-molten salt-heating network circuit and then enters the primary-side backup pipelines of the secondary heater 21 and preheat heater 22, heating the molten salt-heating network circuit.

[0084] This embodiment provides a nuclear energy heating system, which includes: a reactor, an intermediate loop, a heat consumption loop, a molten salt loop and a molten salt-heat network loop; the intermediate loop includes: an intermediate loop-molten salt heat exchanger; the heat consumption loop includes: a primary heat user and a centralized heating network; the molten salt loop includes: a molten salt storage tank; the molten salt-heat network loop includes: a molten salt side heat network heat exchanger; wherein, the reactor is connected to the primary heat user; the reactor is connected to the molten salt storage tank through the intermediate loop-molten salt heat exchanger; the reactor is connected to the centralized heating network; the molten salt storage tank is connected to the centralized heating network; when the primary heat user consumes a lot of heat, the reactor outputs high power; when the primary heat user consumes less heat, the reactor transfers part of the heat to the molten salt storage tank in the molten salt loop through the intermediate loop-molten salt heat exchanger for temporary storage; when the heat demand of the centralized heating network is high, the heat stored in the molten salt storage tank is transferred to the centralized heating network through the molten salt-heat network loop. The molten salt energy storage circuit proposed in the present invention can store excess heat generated by the reactor when the heat demand of heat users is low, and use this heat for peak regulation in circuits with large fluctuations in heat demand, thereby improving the flexibility of the nuclear energy system in heat supply. Compared with the base load operation mode commonly used in current nuclear energy heating systems, this mode can get rid of the nuclear energy heating system's dependence on other heat sources and improve its heating flexibility.

[0085] The molten salt heat storage loop designed for this system has excellent load absorption capacity and can absorb excess reactor power when the reactor power fluctuates, further improving the safety of the nuclear energy heating system.

[0086] The types of heat users that this system can satisfy are not limited to those mentioned in the design. For other types of heat users, the system may still have a good match and has broad application prospects.

[0087] Example 2

[0088] As shown in FIG2 , this embodiment provides a nuclear energy heating method applied to a nuclear energy heating system coupled with molten salt energy storage as described in Example 1, comprising:

[0089] S1. Obtain the heat consumption of primary heat users and the heat demand of the central heating network;

[0090] S2. In response to a first control instruction, delivering heat generated by the reactor to a primary heat user; the first control instruction is an instruction indicating that the heat demand of the primary heat user is higher than a first set threshold;

[0091] S3. In response to a second control instruction, a portion of the heat generated by the reactor is delivered to the primary heat user, and another portion of the heat is transferred to the molten salt storage tank in the molten salt loop through the intermediate loop-molten salt heat exchanger; the second control instruction is an instruction indicating that the heat demand of the primary heat user is equal to or lower than the first set threshold;

[0092] S4. When responding to a third control instruction, the heat stored in the molten salt storage tank is transferred to the centralized heating network; the third control instruction is an instruction indicating that the heat demand of the centralized heating network is higher than a second set threshold.

[0093] Before the system starts, it also includes:

[0094] Start the electric heater in the molten salt circuit;

[0095] The electric heater is used to pump the heating gas in the molten salt loop to the molten salt loop valve of the electric heater and enter the hot salt storage tank to heat the molten salt in the hot salt storage tank;

[0096] The heated gas enters the cold salt storage tank through the hot salt storage tank-cold salt storage tank valve, continues to heat the molten salt in the cold salt storage tank, and finally returns to the electric heater.

[0097] This working method has certain heating peak regulation capability and load absorption capacity, which is specifically manifested as follows:

[0098] When using this nuclear energy heating system for heating (including industrial heating and centralized heating), when the heat demand of primary heat users is high, the reactor output power is higher to meet the heat needs of heat users; when the heat demand of primary heat users is low, the reactor can transfer some heat to the molten salt circuit for temporary storage through the intermediate circuit-molten salt heat exchanger without changing the power. When the heat demand of the centralized heating network is high, the heat stored in the molten salt is transferred to the centralized heating network through the molten salt-heating network circuit to meet the heat demand of the centralized heating network. At the same time, the existence of the molten salt circuit allows the molten salt to accommodate excess heat in the reactor, further improving the reactor's load absorption capacity. In addition, the heat from the molten salt circuit can be used to heat the working fluid in the heat-using circuit, preheating it and improving the thermal efficiency of the heat-using circuit.

[0099] The thermal output of the molten salt circuit can be flexibly adjusted by adjusting the speed of the drive pumps in the molten salt circuit and the molten salt-heating network circuit. At the same time, the two molten salt tanks should also be designed to ensure sufficient load absorption capacity. Therefore, the system proposed in this invention has excellent peak-shaving flexibility and load absorption capacity.

[0100] The molten salt energy storage circuit proposed in this embodiment can store excess heat generated by the reactor when heat demand is low, and use this heat for peak load regulation in circuits with more volatile heat demand. This design enhances the flexibility of nuclear energy systems in heat supply. Compared with the baseload operation mode commonly used by current nuclear heating systems, this mode eliminates the nuclear heating system's reliance on other heat sources, thus improving its flexibility.

[0101] Through the molten salt heat storage circuit proposed in the present invention, the heat stored in the molten salt can be used to preheat the condensed water in the heat-using circuit, and this heat can be used to improve the operating efficiency of the heat-using circuit.

[0102] Example 3

[0103] This embodiment provides a nuclear energy heating system, which is primarily composed of an intermediate circuit, a heat consumption circuit, a molten salt circuit, and a molten salt-heating network circuit. The intermediate circuit is connected to the secondary side of the reactor main heat exchanger 2, the primary side of the intermediate circuit-molten salt heat exchanger 25, and the primary side of the steam generator 9. The heat consumption circuit is connected to the secondary side of the steam generator 9, the primary heat user 35, and the primary side of the nuclear-side heat network heat exchanger 11. The molten salt circuit is connected to the secondary side of the intermediate circuit-molten salt heat exchanger 25, the secondary heater 21, and the primary side of the preheating heater 20. The molten salt-heating network circuit is connected to the molten salt-side heat consumption circuit heat exchanger 12, the primary side of the molten salt-side heat network heat exchanger 15, and the secondary sides of the preheating heater 22 and the secondary heater 21.

[0104] When the system starts up, the electric heater 29 in the molten salt circuit is activated. Driven by the electric heater-to-molten salt circuit pump 28, the heated gas flows through the electric heater-to-molten salt circuit valve 27 into the hot salt storage tank 31, heating the molten salt in the hot salt tank. The gas then flows through the hot salt tank-to-cold salt tank valve 32 into the cold salt tank 23, continuing to heat the cold salt, and ultimately returns to the electric heater. The pipeline between the cold and hot salt tanks is heated by the intermediate circuit-to-molten salt heat exchanger 25. After heating, the molten salt in the main pipelines and the two molten salt tanks melts, and the system is put into operation.

[0105] Heat generated by the reactor is transferred via an intermediate loop to the steam generator 9, where steam is generated on the secondary side of the steam generator. This steam then enters the primary heat user 35 for use in urea / vinyl chloride production. Return steam from the primary heat user enters the primary side of the nuclear-side heat network heat exchanger 11, where it exchanges heat with the central heating network 36, where it is condensed into water. At this point, the heat demand of the central heating network may exceed the heat capacity provided by the return water provided by the primary heat users. Since the system has just been put into operation, the amount of molten salt stored in the hot salt storage tank 31 may not meet demand. Therefore, the electric heater 29 pumps out the molten salt from the cold salt storage tank 23. After heating, the gas is removed through the electric heater-molten salt-heat network circuit valve 30 and fed into the secondary heater 21 and preheat heater 22 primary side spare pipelines to heat the molten salt-heat network circuit. The working fluid in the molten salt-heat network circuit heats the molten salt-side heat network heat exchanger 15 to meet the demand of the central heating network.

[0106] When the heat demand of the primary heat users decreases, it is not necessary to adjust the reactor power. Instead, the excess heat in the reactor is transferred to the molten salt circuit by adjusting the speed of the second intermediate circuit pump 6 and the opening of the intermediate-molten salt circuit valve 34, and temporarily stored in the hot salt storage tank 31. When the amount of molten salt in the hot salt storage tank 31 can meet the heating demand of the centralized heating circuit, the electric heater 29 is disconnected from the circuit, and the molten salt in the hot salt storage tank, driven by the second molten salt circuit pump 33, enters the secondary heater 21 and the preheating heater 22 in sequence to release heat. After releasing heat, the low-temperature molten salt enters the cold salt storage tank 23, and enters the intermediate circuit-molten salt heat exchanger 25 driven by the first molten salt circuit pump 24 to absorb heat, and then re-enters the hot salt storage tank.

[0107] The working fluid of the molten salt-heat network loop is responsible for transporting the heat of the molten salt loop to the heat-using loop and the centralized heating network. Driven by the molten salt-heat network loop pump 20, the working fluid of this loop first enters the preheating heater 22, where it exchanges heat with the molten salt with a lower temperature after heat release in the secondary heater 21, and the temperature rises for the first time. Then it enters the secondary heater 21 and exchanges heat with the high-temperature molten salt, and the temperature rises again. The high-temperature working fluid of this loop first enters the heat-using loop heat exchanger 12 on the molten salt side, where it exchanges heat with the heat-using loop working fluid with a lower temperature, and preliminarily heats the heat-using loop working fluid for use by the steam generator 9. Subsequently, the working fluid in the molten salt-heat network loop, which has a slightly lower temperature after the first heat release, enters the molten salt side heat network heat exchanger 15, where it exchanges heat with the heat network working fluid in the centralized heating network 36 that has been heated once by the core side heat network heat exchanger 11. After two heat exchanges, the heat network working fluid meets the usage requirements of the centralized heating network and is used for heating under the drive of the centralized heating network pump 16.

[0108] It should be noted that the object information (including but not limited to object device information, object personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the present invention are all information and data authorized by the object or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions.

[0109] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, and the like.

[0110] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0111] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A nuclear energy heating system coupled with molten salt energy storage, characterized in that: include: Reactor, intermediate circuit, heat circuit, molten salt circuit and molten salt-heat network circuit; The intermediate loop comprises at least: an intermediate loop-molten salt heat exchanger; The heat circuit includes at least: a primary heat user and a centralized heating network; The molten salt circuit comprises at least: a molten salt storage tank; The molten salt-heat network loop comprises at least: a molten salt side heat network heat exchanger; The reactor is connected to the primary heat user; the reactor is connected to the molten salt storage tank via the intermediate loop-molten salt heat exchanger; the reactor is connected to the centralized heating network; the molten salt storage tank is connected to the centralized heating network via the molten salt side heat network heat exchanger; The reactor is used for: When responding to a first control instruction, the generated heat is delivered to a primary heat user; the first control instruction is an instruction indicating that the heat demand of the primary heat user is higher than a first set threshold; When responding to the second control instruction, part of the generated heat is delivered to the primary heat user, and the other part of the heat is transferred to the molten salt storage tank in the molten salt circuit through the intermediate circuit-molten salt heat exchanger; the second control instruction is an instruction indicating that the heat demand of the primary heat user is equal to or lower than the first set threshold; The molten salt storage tank is used to transfer the stored heat to the centralized heating network when responding to a third control instruction; the third control instruction is an instruction indicating that the heat demand of the centralized heating network is higher than a second set threshold.

2. A nuclear energy heating system coupled with molten salt energy storage according to claim 1, characterized in that: The reactor comprises: a core body, a primary side of a main heat exchanger and a reactor pressure vessel; The core body, the primary side of the main heat exchanger and the reactor pressure vessel are connected in sequence to form a loop.

3. A nuclear energy heating system coupled with molten salt energy storage according to claim 1, characterized in that: The intermediate circuit also includes: a secondary side of a main heat exchanger, a pressure stabilizer, a first intermediate circuit pump, a second intermediate circuit pump, an intermediate circuit main valve, an intermediate circuit isolation valve, an intermediate-molten salt circuit valve and a primary side of a steam generator; The secondary side outlet of the main heat exchanger is connected to the primary side inlet of the steam generator, and a pressure stabilizer connecting pipe is provided on the intermediate pipe section between the secondary side outlet of the main heat exchanger and the primary side inlet of the steam generator, and the pressure stabilizer connecting pipe is connected to the pressure stabilizer; The steam generator primary side outlet is connected to the first intermediate circuit pump inlet; an intermediate circuit isolation valve is provided on the pipe section between the pressure stabilizer connecting pipe and the steam generator primary side inlet and on the pipe section between the steam generator primary side outlet and the first intermediate circuit pump inlet; The outlet of the first intermediate circuit pump is connected to the inlet of the intermediate circuit main valve, and the outlet of the intermediate circuit main valve is connected to the secondary side inlet of the main heat exchanger; a second intermediate circuit pump is provided on the pipe section between the secondary side outlet of the main heat exchanger and the pressure stabilizer connecting pipe; The second intermediate loop pump outlet is connected to the intermediate-molten salt loop valve, the intermediate-molten salt loop valve is connected to the primary side inlet of the intermediate loop-molten salt heat exchanger, and the primary side outlet of the intermediate loop-molten salt heat exchanger is connected to the pipe section between the intermediate loop main valve and the secondary side inlet of the main heat exchanger.

4. A nuclear energy heating system coupled with molten salt energy storage according to claim 1, characterized in that: The heat circuit also includes: a steam generator secondary side, a heat circuit isolation valve, a heat circuit pump, a nuclear side heat network heat exchanger primary side and a molten salt side heat circuit heat exchanger secondary side; Among them, the secondary side outlet of the steam generator is connected to the inlet of the heat pipe of the first-level heat user, the outlet of the heat pipe of the first-level heat user is connected to the primary side inlet of the nuclear side heat network heat exchanger, the primary side outlet of the nuclear side heat network heat exchanger is connected to the inlet of the heat circuit pump, the outlet of the heat circuit pump is connected to the secondary side inlet of the heat circuit heat exchanger on the molten salt side, and the secondary side outlet of the heat circuit heat exchanger on the molten salt side is connected to the secondary side inlet of the steam generator.

5. The nuclear energy heating system coupled with molten salt energy storage according to claim 1, characterized in that: The molten salt storage tank includes: a cold salt storage tank and a hot salt storage tank; The molten salt circuit also includes: a secondary heater primary side, a preheating heater primary side, a first molten salt circuit pump, an intermediate circuit-molten salt heat exchanger secondary side, a molten salt circuit main valve, an electric heater to molten salt circuit valve, an electric heater to molten salt circuit pump, an electric heater, an electric heating-molten salt-heating network circuit valve and a second molten salt circuit pump; Among them, the outlet of the cold salt storage tank is connected to the first molten salt loop pump, the first molten salt loop pump is connected to the secondary side inlet of the intermediate loop-molten salt heat exchanger, the secondary side outlet of the intermediate loop-molten salt heat exchanger is connected to the molten salt loop main valve, the outlet of the molten salt loop main valve is connected to the hot salt storage tank, the outlet of the hot salt storage tank is connected to the second molten salt loop pump, the outlet of the second molten salt loop pump is connected to the primary side inlet of the secondary heater, the primary side outlet of the secondary heater is connected to the primary side inlet of the preheating heater, and the primary side outlet of the preheating heater is connected to the inlet of the cold salt storage tank; the outlet of the electric heater is connected to the electric heater to molten salt loop pump, the outlet of the electric heater to molten salt loop pump is connected to the hot salt storage tank through the electric heater to molten salt loop valve, an opening of the hot salt storage tank is connected to the hot salt storage tank-cold salt storage tank valve, and the hot salt storage tank-cold salt storage tank valve is connected to the cold salt storage tank; the outlet of the electric heater to molten salt loop pump is connected to the electric heater-molten salt-heating network loop valve.

6. A nuclear energy heating system coupled with molten salt energy storage according to claim 5, characterized in that: The temperature of the molten salt in the cold salt storage tank is 150-180°C, and the temperature of the molten salt in the hot salt storage tank is 200-250°C.

7. The nuclear energy heating system coupled with molten salt energy storage according to claim 1, characterized in that: The molten salt-heating network loop also includes: a primary side of a heat circuit heat exchanger for the molten salt side, a primary side of a heat network heat exchanger for the molten salt side, an isolation valve for the heat network heat exchanger for the molten salt side, an isolation valve for the heat circuit heat exchanger for the molten salt side, a main valve for the molten salt-heating network loop, a molten salt-heating network loop pump, a secondary side of a secondary heater, and a secondary side of a preheating heater; Among them, the secondary side outlet of the secondary heater is connected to the molten salt-heat network loop pump, the molten salt-heat network loop pump is connected to the molten salt-heat network loop main valve, the molten salt-heat network loop main valve is connected to the primary side inlet of the molten salt side heat circuit heat exchanger, the primary side outlet of the molten salt side heat circuit heat exchanger is connected to the primary side inlet of the molten salt side heat network heat exchanger, the primary side outlet of the molten salt side heat network heat exchanger is connected to the secondary side inlet of the preheating heater, and the secondary side outlet of the preheating heater is connected to the secondary side inlet of the secondary heater; the molten salt side heat circuit heat exchanger isolation valve isolates the molten salt side heat circuit heat exchanger from the molten salt-heat network loop, and the molten salt side heat network heat exchanger isolation valve isolates the molten salt side heat network heat exchanger from the molten salt-heat network loop.

8. The nuclear energy heating system according to claim 1, characterized in that: The primary heat user is a factory that produces and processes urea or vinyl chloride.

9. A nuclear energy heating method applied to a nuclear energy heating system coupled with molten salt energy storage as claimed in any one of claims 1 to 8, characterized in that: The method comprises: Obtain the heat consumption of primary heat users and the heat demand of the central heating network; When responding to a first control instruction, the heat generated by the reactor is delivered to the primary heat user; the first control instruction is an instruction indicating that the heat demand of the primary heat user is higher than a first set threshold; In response to a second control instruction, a portion of the heat generated by the reactor is delivered to the primary heat user, and the remaining heat is transferred to the molten salt storage tank in the molten salt circuit through the intermediate circuit-molten salt heat exchanger; the second control instruction is an instruction indicating that the heat demand of the primary heat user is equal to or lower than the first set threshold; When responding to the third control instruction, the heat stored in the molten salt storage tank is transferred to the centralized heating network; the third control instruction is an instruction indicating that the heat demand of the centralized heating network is higher than the second set threshold.

10. The nuclear energy heating method according to claim 9, characterized in that: Before the system starts, it also includes: Start the electric heater in the molten salt circuit; The electric heater is used to pump the heating gas in the molten salt loop to the molten salt loop valve of the electric heater and enter the hot salt storage tank to heat the molten salt in the hot salt storage tank; The heated gas enters the cold salt storage tank through the hot salt storage tank-cold salt storage tank valve, continues to heat the molten salt in the cold salt storage tank, and finally returns to the electric heater.

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