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

Abstract

The present invention discloses a nuclear energy heating system coupled with molten salt energy storage and a heating method thereof, and relates to the technical field of peak regulation of nuclear energy heating system, wherein the system comprises: a reactor, an intermediate loop, a heat-using 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-using 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 heat network heat exchanger; when the primary heat user has low heat consumption, the reactor transfers a portion 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. The molten salt energy storage loop of the present invention stores excess heat when the heat demand of the heat user is low, and uses the portion of the heat for peak regulation in a loop with large fluctuations in heat demand, thereby improving the flexibility of the nuclear energy system in heating.

Description

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, the comprehensive utilization of nuclear energy such as nuclear energy heating has received more and more attention. At present, the development of nuclear energy heating system has been relatively mature. Whether it is using nuclear power plants for cogeneration or using dedicated nuclear energy heating reactors for regional heating, many practices have been carried out. At present, the commonly used nuclear energy heating reactors are mainly shell reactors, pool reactors and pool-shell combined reactors. Among them, the shell reactor has a relatively wide application in the field of heating due to its primary circuit pressure operation and the high output primary circuit coolant temperature, and has received more attention.

[0003] Since the operating conditions of nuclear energy heating systems are different from those of nuclear power units, the heat network may frequently change the heat load required by the heating network according to the current weather conditions (or the heat demand of heat users) during operation. Therefore, the peak-shaving capacity of nuclear energy heating systems is required to be higher. However, the peak-shaving capacity of nuclear energy heating systems is generally poor, and most of them adopt the base load operation mode. If peak-shaving heat is provided by other forms of heat sources, the nuclear energy heating system will never be able to get rid of its dependence on other energy sources (mostly fossil fuels), which greatly limits the application of nuclear energy heating systems and their further development.

[0004] Therefore, there is an urgent need in the art for a nuclear energy heating system that has peak load regulation 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 users have low heat demand, and temporarily stores it; when heat users have high heat demand, 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 use loop, a molten salt loop and a molten salt-heat network loop;

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

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

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

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

[0012] 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 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 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;

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

[0017] Optionally, the reactor comprises: 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 sequentially connected 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] Wherein, 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 arranged on the middle 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 arranged on the pipe section between the secondary side outlet of the main heat exchanger and the connecting pipe of the pressure stabilizer;

[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 primary heat user, the outlet of the heat pipe of the primary 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 loop also includes: a secondary heater primary side, a preheating heater primary side, a first molten salt loop pump, an intermediate loop-molten salt heat exchanger secondary side, a molten salt loop main valve, an electric heater to molten salt loop valve, an electric heater to molten salt loop pump, an electric heater, an electric heater-molten salt-heating network loop valve and a second molten salt loop 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 molten salt loop pump, the outlet of the electric heater molten salt loop pump is connected to the hot salt storage tank through the electric heater 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 molten salt loop pump is connected to the electric heater-molten salt-heat 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-heat 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 a heat circuit heat exchanger for the molten salt side, an isolation valve for a heat circuit heat exchanger for the molten salt side, a main valve for the molten salt-heat network loop, a molten salt-heat 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 heat circuit heat exchanger on the molten salt side, the primary side outlet of the heat circuit heat exchanger on the molten salt side is connected to the primary side inlet of the heat network heat exchanger on the molten salt side, the primary side outlet of the heat network heat exchanger on the molten salt side 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 heat circuit heat exchanger isolation valve on the molten salt side isolates the heat circuit heat exchanger on the molten salt side from the molten salt-heat network loop, and the heat network heat exchanger isolation valve on the molten salt side isolates the heat network heat exchanger on the molten salt side 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 district heating network;

[0035] When responding to a first control instruction, the heat generated by the reactor 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;

[0036] When responding to the second control instruction, part of the heat generated by the reactor 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 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;

[0037] When responding to the third control instruction, the heat stored in the molten salt storage tank is transferred to the district heating network; the third control instruction is an instruction indicating that the heat demand of the district 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 electric heater to the molten salt loop and drive the heating gas in the electric heater to enter the hot salt storage tank through the electric heater to the molten salt loop valve 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 heating system and a heating method, which comprises: a nuclear energy heating system, characterized in that it comprises: a reactor, an intermediate loop, a heat-using loop, a molten salt loop and a molten salt-heating network loop; the intermediate loop at least comprises: an intermediate loop-molten salt heat exchanger; the heat-using 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-heating 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 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 connection; the reactor is used to: when responding to the first control instruction, the generated heat 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 the first set threshold; when responding to the second control instruction, a 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 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; the molten salt storage tank is used to transfer the stored heat to the central heating network when responding to the third control instruction; the third control instruction is an instruction indicating that the heat demand of the central heating network is higher than the second set threshold. The molten salt energy storage loop proposed in the present invention can store the excess heat generated by the reactor when the heat demand of the heat user is low, and use this part of the heat for peak regulation in the loop with large fluctuations in heat demand, thereby improving the flexibility of the nuclear energy system in heating. Compared with the base load operation mode commonly used in the current nuclear energy heating system, this mode can get rid of the dependence of the nuclear energy heating system 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 drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

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

[0046] Figure 2 A schematic flow chart of a nuclear energy heating method for a nuclear energy heating system provided in Example 2 of the present invention.

[0047] Explanation of symbols:

[0048] Core body—1; main heat exchanger—2; reactor pressure vessel—3; pressurizer—4; first intermediate loop pump—5; second intermediate loop pump—6; intermediate loop main valve—7; intermediate loop isolation valve—8; steam generator—9; heat circuit isolation valve—10; nuclear side heat network heat exchanger—11; molten salt side heat circuit heat exchanger—12; heat 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 circuit heat exchanger isolation valve—18; molten salt-heat network return Main valve of the circuit—19; molten salt-heating network loop pump—20; secondary heater—21; preheating heater—22; cold salt storage tank—23; first molten salt loop pump—24; intermediate loop-molten salt heat exchanger—25; molten salt loop main valve—26; electric heater to molten salt loop valve—27; electric heater to molten salt loop pump—28; electric heater—29; electric heater-molten salt-heating network loop valve—30; hot salt storage tank—31; hot salt storage tank-cold salt storage tank valve—32; second molten salt loop pump—33; intermediate-molten salt loop valve—34; primary heat user—35; centralized heating network—36. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0050] 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.

[0051] The present invention aims to design a nuclear energy heating system with peak load regulation capability. To achieve this purpose, a nuclear energy heating system coupled with molten salt energy storage is designed. The molten salt energy storage system is used to absorb the excess heat output from the nuclear energy heating reactor when the heat demand of heat users is low, and temporarily store it. When the heat demand of heat users is high, the heat stored in the molten salt energy storage system is released back to the heat network to make up for the heat gap during this period. Through this working mode, the nuclear energy heating system can have a certain peak load regulation heating capacity, and has higher flexibility and a wider range of application when used for heating.

[0052] 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 users have low heat demand, and temporarily stores it; when heat users have high heat demand, 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.

[0053] 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.

[0054] Example 1

[0055] like Figure 1 As shown, this embodiment provides a nuclear energy heating system, including: a reactor, an intermediate loop, a heat circuit, a molten salt circuit and a molten salt-heat network circuit. Figure 1 The thick dashed line in the heat loop represents the water vapor generated by the steam generator, and the thin dashed line in the molten salt loop represents the gas generated in the electric heater for heating the molten salt.

[0056] 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.

[0057] The reactor 1 is connected to the primary heat user 35; the reactor is connected to the molten salt storage tank through the intermediate loop-molten salt heat exchanger 25; the reactor is connected to the central heating network 36; the molten salt storage tank is connected to the central heating network 36 through the molten salt side heat network heat exchanger. The heat circuit includes: the primary heat user and the central heating network. The heat network is mainly connected to the heat circuit. When the molten salt is not in use, the working fluid of the heat circuit is also used to heat the heat network. The molten salt plays a role of secondary heating to increase the input power of the heat network.

[0058] The reactor is used for:

[0059] When responding to the 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 the first set threshold;

[0060] 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.

[0061] The molten salt storage tank is used to transfer the stored heat to the central heating network 36 when responding to a third control instruction; the third control instruction is an instruction indicating that the heat demand of the central heating network 36 is higher than a second set threshold.

[0062] Among them, the first set threshold and the second set threshold are determined according to the actual situation. When the nuclear energy heating system is used for heating (including industrial heating and centralized heating), when the heat consumption of the primary heat user is high, the reactor output power is high to meet the heat demand of the heat user; when the heat consumption of the primary heat user is low, the reactor can transfer part of the heat to the molten salt loop through the intermediate loop-molten salt heat exchanger without changing the power for temporary storage. When the heat demand of the centralized heating network is high (the heat demand of the heating network cannot be met by the return steam of the primary heat user alone), the heat stored in the molten salt is transferred to the centralized heating network through the molten salt-heat network loop to meet the heat demand of the centralized heating network. At the same time, the existence of the molten salt loop enables the molten salt to accommodate the excess heat in the reactor, further improving the load absorption capacity of the reactor. In addition, the heat of the molten salt loop can be used to heat the working medium in the heat loop, preheat it, and improve the thermal efficiency of the heat loop.

[0063] Specifically:

[0064] The reactor is composed 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 .

[0065] The intermediate loop mainly includes the secondary side of the main heat exchanger 2, the pressure stabilizer 4, the first intermediate loop pump 5, the second intermediate loop pump 6, the intermediate loop main valve 7, the intermediate loop isolation valve 8, the intermediate-molten salt loop valve 34, the primary side of the intermediate loop-molten salt heat exchanger 25 and the primary side of the steam generator 9.

[0066] Among them, the secondary side outlet of the main heat exchanger 2 is connected to the primary side inlet of the steam generator 9, a stabilizer connecting pipe is arranged in the middle pipe section, the stabilizer 4 is connected to the middle circuit through the branch pipe, the primary side outlet of the steam generator 9 is connected to the inlet of the first middle circuit pump 5, the middle circuit isolation valve 8 is connected between the 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 pipe section of the first middle circuit pump 5, the outlet of the first middle circuit pump 5 is connected to the inlet of the middle circuit main valve 7, the outlet of the middle 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 stabilizer connecting pipe, connected to the second middle circuit pump 6, the outlet of the second middle circuit pump 6 is connected to the middle-molten salt circuit valve 34, the middle-molten salt circuit valve 34 is connected to the primary side inlet of the middle circuit-molten salt heat exchanger 25, the primary side outlet of the middle circuit-molten salt heat exchanger 25 is connected to the pipe section between the middle circuit main valve 7 and the secondary side inlet of the main heat exchanger 2.

[0067] 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 heat circuit heat exchanger 12 on the molten salt side.

[0068] 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 nuclear side heat network heat exchanger 11, the primary side outlet of the nuclear 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 heat circuit heat exchanger 12 on the molten salt side, and the secondary side outlet of the heat circuit heat exchanger 12 on the molten salt side is connected to the secondary side inlet of the steam generator 9.

[0069] 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 heater-molten salt-heat 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.

[0070] Wherein, 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 finally returns to the electric heater 29 after flowing out of the cold salt storage tank 23; 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 enters the primary side standby inlet of the secondary heater 21 and the primary side standby inlet of the preheating heater 22 in sequence from the electric heater-molten salt-heating network circuit valve 30 and finally returns to the electric heater 29.

[0071] The molten salt-heat 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 heat circuit heat exchanger 12 on the molten salt side, the primary side of the heat network heat exchanger 15 on the molten salt side, the molten salt-heat 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-heat network loop main valve 19.

[0072] Among them, the secondary side outlet of the secondary heater 21 is connected to the molten salt-heating network loop pump 20, the molten salt-heating network loop pump 20 is connected to the molten salt-heating network loop main valve 19, the molten salt-heating network loop main valve 19 is connected to the primary side inlet of the molten salt side heat circuit heat exchanger 12, the primary side outlet of the molten salt side heat circuit heat exchanger 12 is connected to the primary side inlet of the molten salt side heat network heat exchanger 15, the primary side outlet of the molten salt side heat network heat exchanger 15 is connected to the secondary side inlet of the preheating heater 22, and the secondary side outlet of the preheating heater 22 is connected to the secondary side 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 loop, 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 loop.

[0073] During the operation of the system, the intermediate loop working fluid that absorbs heat and heats up in the main heat exchanger 2 flows along the pipeline and enters the primary side of the steam generator 9 and the primary side of the intermediate loop-molten salt heat exchanger 25 according to the designed working conditions. In the first and third working conditions, after the intermediate loop working fluid exchanges heat in the primary side of the steam generator 9, it flows back to the main heat exchanger 2 under the drive of the first intermediate loop pump 5; in the second working condition, after the intermediate loop working fluid exchanges heat with the molten salt in the primary side of the intermediate loop-molten salt heat exchanger 25, the intermediate loop working fluid merges with the intermediate loop main pipeline through the outlet branch pipe of the primary side of the intermediate loop-molten salt heat exchanger 25 and enters the main heat exchanger 2. In the molten salt loop, the molten salt with a lower temperature in the cold salt storage tank 23 flows out of the molten salt tank under the drive of the first molten salt loop pump 24, enters the secondary side of the intermediate loop-molten salt heat exchanger 25 to absorb heat, and the temperature rises. The heated molten salt flows into the hot salt storage tank 31, and the hot molten salt with a higher temperature is stored therein and used for various heat purposes. In this system design, the molten salt in the hot salt storage tank 31 flows out from the second molten salt loop pump 33, enters the primary side of the secondary heater 21, and exchanges heat with the working fluid in the molten salt-heating network loop. The molten salt after heat exchange enters the primary side of the preheating heater 22, continues to exchange heat with the working fluid in the molten salt-heating network loop, and finally returns to the cold salt storage tank 23.

[0074] The working fluid on the secondary side of the steam generator 9 absorbs the heat on the primary side and vaporizes therein, and the generated steam is used for various heat purposes (transported to the primary heat user 35 via pipelines). After releasing heat there, the return steam is sent along the pipeline to the primary side of the core side heat network heat exchanger 11 to exchange heat (release heat) with the centralized heating network 36. After heat exchange there, the return steam condenses into water and enters the secondary side of the heat circuit heat exchanger 12 on the molten salt side driven by the heat circuit pump 13. 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 sent to the secondary side of the steam generator 9, completing a cycle.

[0075] In the molten salt loop, the hot molten salt releases heat in the secondary heater 21 and the preheating heater 22. In the molten salt-heating network loop, the working fluid of this loop flows in the opposite direction to the molten salt in the molten salt loop. It first enters the preheating heater 22 for the first heating. The heated working fluid enters the secondary heater 21 to be heated again, and enters the heat exchanger 12 of the heat circuit on the molten salt side under the drive of the molten salt-heating network loop pump 20 to heat the water in the heat circuit. The working fluid flowing out of the heat circuit heat exchanger on the molten salt side enters the heat network heat exchanger 15 on the molten salt side to exchange heat with the district heating network 36. On the district 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 side heat network heat exchanger 15. The working fluid of this loop enters the heat user for heat exchange under the drive of the district heating network pump 16.

[0076] 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.

[0077] The core-side heat network heat exchanger 11 acts as a condenser in the heat-using loop. The steam exhausted by the primary heat user is condensed into water in the primary side of the heat exchanger for subsequent heat-using loop circulation.

[0078] The function of the heat exchanger 12 on the molten salt side heat circuit is to heat the water in the heat circuit so that the water is preheated before entering the steam generator 9, thereby improving the heating efficiency of the heat circuit.

[0079] 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 (or the flow rate will be reduced) the molten salt side heat circuit heat exchanger 12, 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.

[0080] The new steam generated by the steam generator 9 is saturated steam with a temperature of about 200°C, and its primary heat user can be a factory producing and processing urea or vinyl chloride. The return steam temperature of the primary heat user is 100-150°C, and the steam is condensed into water at the core side heat network heat exchanger 11.

[0081] The central heating network requires hot 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.

[0082] The electric heater 29 is powered by an external generator and has two main functions:

[0083] First, the molten salt is preheated before use. A certain amount of gas is stored in the electric heater, and the molten salt in the loop is heated and melted by gas heating. The gas is transported to the hot salt storage tank 31 through the electric heater to the molten salt loop valve 27, and the molten salt in the hot salt storage tank is further melted, and then transported to the cold salt storage tank through the hot salt storage tank-cold salt storage tank valve 32, and the cold salt therein is melted, and finally returned to the electric heater ( Figure 1 The middle dashed line represents the gas pipeline);

[0084] Second, when the amount of hot molten salt is small at the beginning of the system startup and cannot meet the demand of the central heating network, an electric heater is used to heat the molten salt to meet the initial heating demand. The molten salt enters the electric heater from the cold salt storage tank, and in the electric heater, the heater enters the primary side spare pipeline of the secondary heater 21 and the preheating heater 22 in turn through the electric heater-molten salt-heating network loop valve 30 to heat the molten salt-heating network loop.

[0085] The present embodiment provides a nuclear energy heating system, which includes: a reactor, an intermediate loop, a heat-using 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-using 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 uses a high amount of heat, the reactor outputs high power; when the primary heat user uses a low amount of heat, the reactor transfers a portion 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 centralized heating network has a high heat demand, 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 part of heat for peak regulation in the circuit with large fluctuations in heat demand, thereby improving the flexibility of the nuclear energy system in heating. 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.

[0086] The molten salt heat storage loop designed in this system has a good load absorption capacity and can absorb the excess power of the reactor when the reactor power fluctuates, further improving the safety of the nuclear energy heating system.

[0087] The types of thermal users that this system can satisfy are not limited to those mentioned in the design. For other types of thermal users, the system may still have a good match and has broad application prospects.

[0088] Example 2

[0089] like Figure 2 As shown, 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:

[0090] S1. Obtain the heat consumption of primary heat users and the heat demand of the central heating network;

[0091] S2. When responding to a first control instruction, the heat generated by the reactor 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;

[0092] S3. When responding to the second control instruction, a part of the heat generated by the reactor 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 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 value;

[0093] S4. When responding to a third control instruction, the heat stored in the molten salt storage tank is transferred to the central heating network; the third control instruction is an instruction indicating that the heat demand of the central heating network is higher than a second set threshold.

[0094] Before the system starts, it also includes:

[0095] Start the electric heater in the molten salt circuit;

[0096] The electric heater is used to pump the heating gas in the electric heater to the molten salt loop and drive the heating gas in the electric heater to enter the hot salt storage tank through the electric heater to the molten salt loop valve to heat the molten salt in the hot salt storage tank;

[0097] 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.

[0098] This working method has certain heating peak regulation capacity and load absorption capacity, which is specifically manifested as follows:

[0099] When the nuclear energy heating system is used for heating (including industrial heating and centralized heating), when the heat consumption of the primary heat users is high, the reactor output power is high to meet the heat demand of the heat users; when the heat consumption of the primary heat users is low, the reactor can transfer part of the heat to the molten salt loop through the intermediate loop-molten salt heat exchanger for temporary storage 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-heat network loop to meet the heat demand of the centralized heating network. At the same time, the existence of the molten salt loop enables the molten salt to accommodate the excess heat in the reactor, further improving the load absorption capacity of the reactor. In addition, the heat of the molten salt loop can be used to heat the working fluid in the heat loop, preheat it, and improve the thermal efficiency of the heat loop.

[0100] The thermal power output in the molten salt loop can be flexibly adjusted by adjusting the speed of each driving pump in the molten salt loop and the molten salt-heat network loop, and the two molten salt tanks should also ensure sufficient load absorption capacity during the design process. Therefore, the system proposed by the present invention has good peak-shaving flexibility and load absorption capacity.

[0101] Through the molten salt energy storage loop proposed in this embodiment, the excess heat generated by the reactor can be stored when the heat demand of heat users is low, and this part of the heat can be used for peak regulation in the loop with large fluctuations in heat demand. This design improves the flexibility of the nuclear energy system in heating. Compared with the base load operation mode commonly used in the current nuclear energy heating system, this mode can get rid of the dependence of the nuclear energy heating system on other heat sources and improve its heating flexibility.

[0102] 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 part of the heat can be used to improve the operating efficiency of the heat-using circuit.

[0103] Example 3

[0104] This embodiment provides a nuclear energy heating system, which is mainly composed of an intermediate loop, a heat circuit, a molten salt circuit and a molten salt-heat network circuit. The intermediate loop is connected to the secondary side of the reactor main heat exchanger 2, the primary side of the intermediate loop-molten salt heat exchanger 25 and the primary side of the steam generator 9; the heat 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 loop-molten salt heat exchanger 25, the secondary heater 21, and the primary side of the preheating heater 20; the molten salt-heat network circuit is connected to the molten salt side heat circuit heat exchanger 12, the primary side of the molten salt side heat network heat exchanger 15, the preheating heater 22, and the secondary side of the secondary heater 21.

[0105] When the system is started, the electric heater 29 in the molten salt loop is started, and the heating gas enters the hot salt storage tank 31 through the electric heater to molten salt loop valve 27 under the drive of the electric heater to molten salt loop pump 28, and heats the molten salt in the hot salt storage tank. After that, the gas enters the cold salt storage tank 23 through the hot salt storage tank-cold salt storage tank valve 32, continues to heat the cold salt, and finally returns to the electric heater. The pipeline between the cold salt storage tank and the hot salt storage tank is heated by the intermediate loop-molten salt heat exchanger 25. After heating, the molten salt in the main pipeline and the two molten salt tanks is melted, and the system is put into use.

[0106] The heat generated by the reactor is transferred to the steam generator 9 through the intermediate loop, and steam is generated at the secondary side of the steam generator. The steam enters the primary heat user 35 for use in urea / vinyl chloride production. The return steam generated by the primary heat user after use enters the primary side of the nuclear side heat network heat exchanger 11, and exchanges heat with the centralized heating network 36. At the same time, the return steam is condensed into water in the heat exchanger. At this time, the heat demand of the centralized heating network may exceed the heat that can be provided by the return water provided by the primary heat user. At this time, 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 the use demand. The molten salt in the cold salt storage tank 23 can be pumped out by the electric heater 29, and the gas therein is removed through the electric heater-molten salt-heat network loop valve 30 after heating, and sent to the secondary heater 21 and the preheating heater 22 primary side spare pipeline to heat the molten salt-heat network loop, and the working fluid in the molten salt-heat network loop is used to heat the molten salt side heat network heat exchanger 15 to meet the use demand of the centralized heating network.

[0107] When the heat demand of the primary heat user decreases, it is not necessary to adjust the reactor power. Instead, the excess heat in the reactor is transferred to the molten salt loop by adjusting the speed of the second intermediate loop pump 6 and the opening of the intermediate-molten salt loop 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 central heating loop, the electric heater 29 is disconnected from the loop, and the molten salt in the hot salt storage tank enters the secondary heater 21 and the preheating heater 22 in sequence under the drive of the second molten salt loop pump 33 to release heat. The low-temperature molten salt after heat release enters the cold salt storage tank 23, enters the intermediate loop-molten salt heat exchanger 25 under the drive of the first molten salt loop pump 24 to absorb heat, and re-enters the hot salt storage tank.

[0108] 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, 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 with a slightly lower temperature after one 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.

[0109] 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 need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0110] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and 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 the memory, database or other medium 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), magnetoresistive 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided by the present invention may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited thereto. The processor involved in each embodiment provided by the present invention may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited thereto.

[0111] The technical features of the above embodiments may 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.

[0112] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A nuclear energy heating system coupled with molten salt energy storage, characterized in that: include: Reactor, intermediate loop, heat circuit, molten salt circuit and molten salt-heat network circuit; The intermediate loop at least comprises: an intermediate loop-molten salt heat exchanger; The heat circuit at least includes: a primary heat user and a central heating network; The molten salt circuit at least includes: a molten salt storage tank; The molten salt-heat network loop at least 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 central heating network; the molten salt storage tank is connected to the central heating network through 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 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; The molten salt storage tank is used to transfer the stored heat to the district heating network when responding to a third control instruction; the third control instruction is an instruction indicating that the heat demand of the district 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 loop also 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; Wherein, 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 arranged on the middle 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 arranged on the pipe section between the secondary side outlet of the main heat exchanger and the connecting pipe of the pressure stabilizer; 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 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; Among them, the secondary side outlet of the steam generator is connected to the inlet of the heat pipe of the primary heat user, the outlet of the heat pipe of the primary 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. A 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 loop also includes: a secondary heater primary side, a preheating heater primary side, a first molten salt loop pump, an intermediate loop-molten salt heat exchanger secondary side, a molten salt loop main valve, an electric heater to molten salt loop valve, an electric heater to molten salt loop pump, an electric heater, an electric heater-molten salt-heating network loop valve and a second molten salt loop 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 molten salt loop pump, the outlet of the electric heater molten salt loop pump is connected to the hot salt storage tank through the electric heater 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 molten salt loop pump is connected to the electric heater-molten salt-heat 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. A 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 a heat circuit heat exchanger for the molten salt side, an isolation valve for a 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 heat circuit heat exchanger on the molten salt side, the primary side outlet of the heat circuit heat exchanger on the molten salt side is connected to the primary side inlet of the heat network heat exchanger on the molten salt side, the primary side outlet of the heat network heat exchanger on the molten salt side 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 heat circuit heat exchanger isolation valve on the molten salt side isolates the heat circuit heat exchanger on the molten salt side from the molten salt-heat network loop, and the heat network heat exchanger isolation valve on the molten salt side isolates the heat network heat exchanger on the molten salt side from the molten salt-heat network loop.

8. A nuclear energy heating system coupled with molten salt energy storage 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 district heating network; When responding to a first control instruction, the heat generated by the reactor 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 heat generated by the reactor 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 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; When responding to the third control instruction, the heat stored in the molten salt storage tank is transferred to the district heating network; the third control instruction is an instruction indicating that the heat demand of the district heating network is higher than the second set threshold.

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