阅读说明：本技术 小型氟盐冷却高温堆和高温工艺热耦合利用系统及方法 (Thermal coupling utilization system and method for small-sized villiaumite cooling high-temperature reactor and high-temperature process ) 是由 张大林 姜殿强 王式保 李新宇 王成龙 田文喜 秋穗正 苏光辉 于 2021-09-22 设计创作，主要内容包括：本发明公开了一种小型氟盐冷却高温堆和高温工艺热耦合利用系统及方法,涉及新能源与可再生能源应用领域,小型氟盐冷却高温堆和高温工艺热耦合利用系统包括核反应堆发电系统、电解水制氢系统、热化学制氢系统和高温工艺热利用系统；核反应堆发电系统中的熔盐池储存来自模块化反应堆的高温热量,多级温度的热量用于发电、高温热化学循环制氢和高温工艺热应用场所；核反应堆发电系统的过剩电量可以用于电解水制氢,解决电力消纳问题；本发明既能实现能量的高效利用,也能实现低碳高效制氢,进一步提高了小型氟盐冷却高温堆的经济性,助力碳达峰和碳中和。(The invention discloses a small-sized villaumite-cooled high-temperature reactor and high-temperature process thermal coupling utilization system and a method, and relates to the field of application of new energy and renewable energy; a molten salt pool in a nuclear reactor power generation system stores high-temperature heat from a modular reactor, and the heat with multi-stage temperature is used in power generation, high-temperature thermochemical cycle hydrogen production and high-temperature process heat application places; the surplus electric quantity of the nuclear reactor power generation system can be used for producing hydrogen by electrolyzing water, so that the problem of electric power consumption is solved; the invention can realize the high-efficiency utilization of energy, can also realize the low-carbon high-efficiency hydrogen production, further improves the economy of the small-sized villiaumite cooling high-temperature reactor, and assists the carbon peak reaching and carbon neutralization.)

1. A small-size villaumite cools off high temperature heap and high temperature technology thermal coupling utilizes system which characterized in that: the system comprises a nuclear reactor power generation system, an electrolytic water hydrogen production system, a thermochemical hydrogen production system and a high-temperature process heat utilization system;

the nuclear reactor power generation system comprises a modular reactor (1), a two-loop molten salt pump (2), a molten salt pool (3), a molten salt pool temperature monitoring system (4), a molten salt pool temperature measuring system (5), and FLiNaK-CO₂Heat exchanger (6) and supercritical carbon dioxide braytonA circulation system (9); an outlet of the modular reactor (1) is connected with an inlet of the molten salt pool (3), an outlet of the molten salt pool (3) is connected with an inlet of the two-circuit molten salt pump (2), and an outlet of the two-circuit molten salt pump (2) is connected with an inlet of the modular reactor (1); molten salt pool temperature measuring system (5) and FLiNaK-CO₂The heat exchanger (6) is positioned in the molten salt pool (3), the molten salt pool temperature monitoring system (4) is positioned outside the molten salt pool (3) and is connected with the molten salt pool temperature measuring system (5), and the FLiNaK-CO₂The cold side of the heat exchanger (6) is connected with a supercritical carbon dioxide Brayton cycle system (9), and power generation equipment in the supercritical carbon dioxide Brayton cycle system (9) is connected with a power grid (10);

the water electrolysis hydrogen production system and the nuclear reactor power generation system share a supercritical carbon dioxide Brayton cycle system (9), and the system further comprises a water supply system (11), a water electrolysis hydrogen production device (12), a power dispatching system (13) and an H₂Collecting device (14) and O₂The collecting device (15), the supercritical carbon dioxide Brayton cycle system (9) are connected with the power dispatching system (13), the power dispatching system (13) is connected with the electrolyzed water hydrogen production device (12), the water supply system (11) is connected with the water supply inlet of the electrolyzed water hydrogen production device (12), and the electrolyzed water hydrogen production device (12) H is connected with the power supply inlet of the electrolyzed water hydrogen production device (13)₂Outlet and H₂The inlet of the collecting device (14) is connected with the hydrogen production device (12) O by electrolyzing water₂Outlet and O₂The collecting device (15) is connected;

the thermochemical hydrogen production system and the electrolytic water hydrogen production system share a water supply system (11) and H₂Collecting device (14) and O₂Collecting device (15), still include FLiNaK-FLiNaK heat exchanger (7) and thermochemistry hydrogen production device (16), FLiNaK-FLiNaK heat exchanger (7) are located molten salt pond (3), FLiNaK-FLiNaK heat exchanger (7) cold side export links to each other with thermochemistry hydrogen production device (16) fused salt inlet, thermochemistry hydrogen production device (16) fused salt export links to each other with FLiNaK-FLiNaK heat exchanger (7) cold side inlet, water supply system (11) link to each other with thermochemistry hydrogen production device (16) feed water inlet, thermochemistry device (16) H hydrogen production device (16)₂Outlet and H₂The inlet of the collecting device (14) is connected with a thermochemical hydrogen production device (16) O₂Outlet and O₂The collecting device (15) is connected;

the high-temperature process heat utilization system comprises a low-temperature FLiNaK heat exchanger (8) and a high-temperature process heat application place (17), wherein the low-temperature FLiNaK heat exchanger (8) is located in the molten salt pool (3), and the cold side of the low-temperature FLiNaK heat exchanger (8) is connected with the high-temperature process heat application place (17).

2. The system for thermally coupling and utilizing a small-sized villiaumite-cooled high-temperature reactor and a high-temperature process according to claim 1, wherein: the FLiNaK-CO₂The heat exchanger (6) is positioned at the upper part of the FLiNaK-FLiNaK heat exchanger (7), and the low-temperature FLiNaK heat exchanger (8) is positioned at the lower part of the FLiNaK-FLiNaK heat exchanger (7).

3. The system for thermally coupling and utilizing a small-sized villiaumite-cooled high-temperature reactor and a high-temperature process according to claim 1, wherein: the outlet temperature of a modular reactor (1) in the nuclear reactor power generation system is 690-700 ℃, and the modular reactor (1) adopts FLiBe salt as a main coolant, LiF and BeF₂The molar numbers of (A) are 67% and 33%, respectively; the two-loop neutralization thermochemical hydrogen production system in which the two-loop molten salt pump (2) is located adopts FLiNaK salt as a circulating working medium, and the mole fractions of LiF, NaF and KF are 46.5%, 11.5% and 42% respectively.

4. The system for thermally coupling and utilizing a small-sized villiaumite-cooled high-temperature reactor and a high-temperature process according to claim 1, wherein: when the power generation of the nuclear reactor power generation system is excessive, part of power is transmitted to the water electrolysis hydrogen production system through the power dispatching system (13) to produce hydrogen.

5. The system for thermally coupling and utilizing a small-sized villiaumite-cooled high-temperature reactor and a high-temperature process according to claim 1, wherein: the thermochemical hydrogen production system adopts copper-chlorine circulation hydrogen production.

6. The system for thermally coupling and utilizing a small-sized villiaumite-cooled high-temperature reactor and a high-temperature process according to claim 1, wherein: the molten salt pool temperature measuring system (5) measures the temperatures of different depths in the molten salt pool (3), the molten salt pool temperature monitoring system (4) monitors the temperature measured by the molten salt pool temperature measuring system (5), and the molten salt pool temperature monitoring system (4) feeds the temperature result back to the supercritical carbon dioxide Brayton circulating system (9), the thermochemistry hydrogen production system and the high-temperature process heat utilization system, so that the systems are ensured to obtain heat with enough temperature.

7. The system for thermally coupling and utilizing a small-sized villiaumite-cooled high-temperature reactor and a high-temperature process according to claim 1, wherein: the high temperature process heat application sites (17) include petroleum refining, seawater desalination, coal liquefaction, natural gas production and ethanol production sites.

8. The system for thermally coupling and utilizing a small-sized villiaumite-cooled high-temperature reactor and a high-temperature process according to claim 1, wherein: the supercritical carbon dioxide Brayton cycle system (9) in the nuclear reactor power generation system adopts CO₂As a circulating working fluid and the cold side cooling working fluid is air.

9. The method for operating a small-scale villiaumite cooled high-temperature reactor and high-temperature process thermal coupling utilization system according to any one of claims 1 to 8, wherein: the nuclear reactor power generation system has the following working process: the modularized reactor (1) is used as a heat source of a nuclear reactor power generation system, low-temperature molten salt in the molten salt pool (3) is pressurized by the two-loop molten salt pump (2), enters the modularized reactor (1) to be heated and heated, flows into the molten salt pool (3) to store heat and heat FLiNaK-CO₂CO at cold side of heat exchanger (6)₂FLiNaK salt at the cold side of the FLiNaK-FLiNaK heat exchanger (7), circulating working medium at the cold side of the low-temperature FLiNaK heat exchanger (8), and FLiNaK-CO₂CO heated in a heat exchanger (6)₂Completing the circulation in a supercritical carbon dioxide Brayton cycle system (9) and delivering electrical energy to a power grid (10);

the water electrolysis hydrogen production system has the following working procedures: when the power generation of the nuclear reactor power generation system is excessive, a part of the power from the supercritical carbon dioxide Brayton cycle system (9) is distributed to the electrolytic water hydrogen production system by the power scheduling system (13), and the power is input to the electrolytic water hydrogen production apparatus (12) to electrolyze pure water from the water supply system (11) to precipitate H₂And O₂Are respectively stored in H₂Collecting means (14) and O₂In the collecting device (15);

the working flow of the thermochemical hydrogen production system is as follows: the high-temperature FLiNaK salt in the molten salt pool (3) heats the FLiNaK salt on the cold side of the FLiNaK-FLiNaK heat exchanger (7), the high-temperature FLiNaK salt enters a thermochemical hydrogen production device (16), and the thermochemical hydrogen production device (16) decomposes pure water from a water supply system (11) into H by utilizing copper-chlorine circulation₂And O₂Are respectively stored in H₂Collecting means (14) and O₂In the collecting device (15), the FLiNaK salt after heat release enters the cold side of the FLiNaK-FLiNaK heat exchanger (7) to be heated again after being pressurized;

the working process of the high-temperature process heat utilization system is as follows: the high-temperature FLiNaK salt in the molten salt pool (3) heats the circulating working medium at the cold side of the low-temperature FLiNaK heat exchanger (8), the circulating working medium flows through the high-temperature process heat application place (17) after absorbing heat, the process flows of petroleum refining, seawater desalination, coal liquefaction, natural gas production and ethanol production places are realized, and the circulating working medium after releasing heat flows back to the cold side of the low-temperature FLiNaK heat exchanger (8) to be heated again.

Technical Field

The invention relates to the field of application of new energy and renewable energy, in particular to a system and a method for thermally coupling and utilizing a small-sized villiaumite cooling high-temperature reactor and a high-temperature process.

Background

Hydrogen energy is a secondary energy source, which is generated by using other energy sources through a certain preparation method, such as electrolytic water, steam reforming of methane and other hydrocarbons, high-temperature thermochemical cycle hydrogen production and the like. The hydrogen production by water electrolysis is simple to operate, but the cost is high and the efficiency is low; the hydrogen production by reforming methane and other hydrocarbons is a common hydrogen production method in industry, but the method can discharge a large amount of greenhouse gases, and does not accord with low-carbon circular economy; high efficiency of hydrogen production by high temperature thermochemical cycle, and production of H by water decomposition₂Without the production of greenhouse gases, the temperature required for the main stream thermochemical cycles (iodine-sulfur cycle and mixed cycle) is higher than 750 ℃, while other low temperature thermochemical cycles (copper-chlorine cycle below 700 ℃) are under development.

A Fluoride-cooled High-temperature Reactor (FHR) is a fourth generation nuclear energy system. The FHR organically combines the advanced technologies of a high-temperature gas cooled reactor, a molten salt reactor and a liquid metal cooling fast reactor, and further improves the safety and the economical efficiency of the FHR. The small-sized villiaumite cooled high-temperature reactor adopts a modular design, the construction period is short, the application is flexible, the outlet temperature of the reactor core is close to 700 ℃, a high-efficiency power generation system can be matched, and in order to fully exert the advantages of the small-sized villiaumite cooled high-temperature reactor, the high-temperature heat generated by the small-sized villiaumite cooled high-temperature reactor needs to be reasonably utilized; in addition, nuclear power has a certain electricity abandoning phenomenon, and the surplus electric quantity needs to be consumed, stored or applied to special scenes; therefore, improving the economics and competitive advantages of small villiaumite cooled high temperature stacks is a major goal of their development.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention aims to provide a system and a method for utilizing a small-sized villiaumite-cooled high-temperature reactor and a high-temperature process thermal coupling, wherein high-temperature heat (within a temperature range of 690-700 ℃) generated by the small-sized villiaumite-cooled high-temperature reactor is utilized to perform high-temperature thermochemical cycle hydrogen production or is used in a high-temperature process heat application place, and in addition, when the generated energy of the small-sized villiaumite-cooled high-temperature reactor is excessive, a part of electric energy is utilized to electrolyze water to produce hydrogen, so that the efficient utilization of the energy of the small-sized villiaumite-cooled high-temperature reactor is realized, and the problem of electric power consumption is solved.

In order to achieve the purpose, the invention adopts the following technical scheme:

a small-sized villiaumite cooling high-temperature reactor and high-temperature process thermal coupling utilization system comprises a nuclear reactor power generation system, an electrolytic water hydrogen production system, a thermochemical hydrogen production system and other high-temperature process heat utilization systems;

the nuclear reactor power generation system comprises a modular reactor 1, a two-loop molten salt pump 2, a molten salt pool 3, a molten salt pool temperature monitoring system 4, a molten salt pool temperature measuring system 5, and a FLiNaK-CO₂A heat exchanger 6 and a supercritical carbon dioxide Brayton cycle system 9; an outlet of the modular reactor 1 is connected with an inlet of a molten salt pool 3, an outlet of the molten salt pool 3 is connected with an inlet of a two-loop molten salt pump 2, and an outlet of the two-loop molten salt pump 2 is connected with an inlet of the modular reactor 1; molten salt pool temperature measurement system 5 and FLiNaK-CO₂The heat exchanger 6 is positioned in the molten salt pool 3, the molten salt pool temperature monitoring system 4 is positioned outside the molten salt pool 3 and is connected with the molten salt pool temperature measuring system 5, and the FLiNaK-CO₂The cold side of the heat exchanger 6 is connected with a supercritical carbon dioxide Brayton cycle system 9, and a power generation device in the supercritical carbon dioxide Brayton cycle system 9 is connected with a power grid 10;

the water electrolysis hydrogen production system and the nuclear reactor power generation system share a supercritical carbon dioxide Brayton cycle system 9, and further comprise a water supply system 11, a water electrolysis hydrogen production device 12, a power dispatching system 13 and an H₂Collecting device 14 and O₂The collecting device 15, the supercritical carbon dioxide Brayton cycle system 9 and the power dispatching system 13 are connected, and the power dispatching system 13 and the electrolyzed water hydrogen productionThe device 12 is connected, the water supply system 11 is connected with the water supply inlet of the water electrolysis hydrogen production device 12, and the water electrolysis hydrogen production device 12H₂Outlet and H₂The inlet of the collecting device 14 is connected with the hydrogen production device 12O by electrolyzing water₂Outlet and O₂The collecting device 15 is connected;

the thermochemical hydrogen production system and the electrolyzed water hydrogen production system share a water supply system 11 and H₂Collecting device 14 and O₂Collecting device 15, still include FLiNaK-FLiNaK heat exchanger 7 and thermochemical hydrogen production device 16, FLiNaK-FLiNaK heat exchanger 7 is located molten salt pond 3, FLiNaK-FLiNaK heat exchanger 7 cold side export links to each other with 16 fused salt inlets of thermochemical hydrogen production device, 16 fused salt exports of thermochemical hydrogen production device link to each other with FLiNaK-FLiNaK heat exchanger 7 cold side entry, water supply system 11 links to each other with 16 water inlets of thermochemical hydrogen production device, thermochemical hydrogen production device 16H₂Outlet and H₂The inlet of the collecting device 14 is connected with a thermochemical hydrogen production device 16O₂Outlet and O₂The collecting device 15 is connected;

the high-temperature process heat utilization system comprises a low-temperature FLiNaK heat exchanger 8 and a high-temperature process heat application place 17, wherein the low-temperature FLiNaK heat exchanger 8 is positioned in the molten salt pool 3, and the cold side of the low-temperature FLiNaK heat exchanger 8 is connected with the high-temperature process heat application place 17.

The FLiNaK-CO₂The heat exchanger 6 is positioned at the upper part of the FLiNaK-FLiNaK heat exchanger 7, and the low-temperature FLiNaK heat exchanger 8 is positioned at the lower part of the FLiNaK-FLiNaK heat exchanger 7.

The outlet temperature of a modular reactor 1 in the nuclear reactor power generation system is 690-700 ℃, and the modular reactor 1 adopts FLiBe salt as a main coolant, LiF and BeF₂The molar numbers of (A) are 67% and 33%, respectively; the two-loop neutralization thermochemical hydrogen production system in which the two-loop molten salt pump 2 is located adopts FLiNaK salt as a circulating working medium, and the mole fractions of LiF, NaF and KF are 46.5%, 11.5% and 42% respectively.

When the power generation of the nuclear reactor power generation system is excessive, part of the power is transmitted to the water electrolysis hydrogen production system through the power dispatching system 13 to produce hydrogen.

The thermochemical hydrogen production system adopts copper-chlorine circulation hydrogen production.

The molten salt pool temperature measuring system 5 measures the temperatures of different depths in the molten salt pool 3, the molten salt pool temperature monitoring system 4 monitors the temperatures measured by the molten salt pool temperature measuring system 5, and the molten salt pool temperature monitoring system 4 feeds temperature results back to the supercritical carbon dioxide Brayton cycle system 9, the thermochemical hydrogen production system and the high temperature process heat utilization system, so that the systems are ensured to obtain heat with enough temperature.

The high temperature process heat application sites 17 include petroleum refining, seawater desalination, coal liquefaction, natural gas production, ethanol production, and the like.

The supercritical carbon dioxide Brayton cycle system 7 in the nuclear reactor power generation system adopts CO₂As a circulating working fluid and the cold side cooling working fluid is air.

The working method of the small-sized villiaumite cooling high-temperature reactor and high-temperature process thermal coupling utilization system comprises the following steps: the modularized reactor 1 is used as a heat source of a nuclear reactor power generation system, low-temperature molten salt in the molten salt pool 3 is pressurized by the two-loop molten salt pump 2, enters the modularized reactor 1 to be heated and heated, flows into the molten salt pool 3 to store heat and heat FLiNaK-CO₂CO at the cold side of the heat exchanger 6₂FLiNaK salt on the cold side of the FLiNaK-FLiNaK heat exchanger 7 and a circulating working medium on the cold side of the low-temperature FLiNaK heat exchanger 8, namely FLiNaK-CO₂CO heated in Heat exchanger 6₂Completing circulation in the supercritical carbon dioxide Brayton cycle system 9 and delivering electrical energy to the grid 10;

when the power generation of the nuclear reactor power generation system is excessive, a part of the electric power from the supercritical carbon dioxide brayton cycle system 9 is distributed to the electrolytic water hydrogen production system by the electric power scheduling system 13, and the electric power is input to the electrolytic water hydrogen production apparatus 12 to electrolyze pure water from the water supply system 11 to precipitate H₂And O₂Are respectively stored in H₂Collecting device 14 and O₂In the collecting device 15;

the high-temperature FLiNaK salt in the molten salt pool 3 heats the FLiNaK salt on the cold side of the FLiNaK-FLiNaK heat exchanger 7, the high-temperature FLiNaK salt enters a thermochemical hydrogen production device 16, and the thermochemical hydrogen production device 16 decomposes pure water from a water supply system 11 into H by utilizing copper-chlorine circulation₂And O₂Are respectively stored in H₂Collecting device 14 and O₂In the collecting device 15, the FLiNaK salt after heat release enters the cold side of the FLiNaK-FLiNaK heat exchanger 7 after being pressurized and is heated again;

the high-temperature FLiNaK salt in the molten salt pool 3 heats the circulating working medium on the cold side of the low-temperature FLiNaK heat exchanger 8, the circulating working medium flows through the high-temperature process heat application site 17 after absorbing heat, the process flows of sites such as petroleum refining, seawater desalination, coal liquefaction, natural gas production, ethanol production and the like are realized, and the circulating working medium after releasing heat flows back to the cold side of the low-temperature FLiNaK heat exchanger 8 to be heated again.

Compared with the prior art, the invention has the following advantages:

1. the invention utilizes the small-sized villiaumite to cool the surplus generated energy of the high-temperature reactor to electrolyze water to prepare hydrogen, and can solve the problem of power consumption.

2. The small-sized villaumite cooling high-temperature reactor utilizes the molten salt pool to store energy, and provides heat with multi-level temperature for the outside by monitoring the temperature levels of different depths of the molten salt pool; the heat with multi-stage temperature can be used for high-efficiency power generation, high-temperature hydrogen production and other high-temperature process heat application places, and the economy of the small-sized villiaumite cooling high-temperature reactor is greatly improved.

3. The heat output by the small-sized villiaumite cooling high-temperature reactor can meet the requirement of hydrogen production by copper-chlorine circulating pyrolysis water, and is clean, efficient, economical and low-carbon.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the figure: 1-a modular reactor; 2-a second loop molten salt pump; 3-molten salt pond; 4-molten salt pool temperature monitoring system; 5-molten salt pool temperature measuring system; 6-FLiNaK-CO₂A heat exchanger; a 7-FLiNaK-FLiNaK heat exchanger; 8-low temperature FLiNaK heat exchanger; 9-supercritical carbon dioxide brayton cycle system; 10-a power grid; 11-a water supply system; 12-a water electrolysis hydrogen production device; 13-a power dispatching system; 14-H₂A collection device; 15-O₂Collection device 16 — thermochemical hydrogen production device; 17-high temperature process heat application.

Detailed Description

The invention provides a thermal coupling utilization system and a method for a small-sized villiaumite cooling high-temperature reactor and a high-temperature process, and the invention is further described in detail by combining the attached drawings.

As shown in fig. 1, the small-sized villaumite-cooled high-temperature reactor and high-temperature process thermal coupling utilization system comprises a nuclear reactor power generation system, an electrolytic water hydrogen production system, a thermochemical hydrogen production system and a high-temperature process thermal utilization system;

the nuclear reactor power generation system comprises a modular reactor 1, a two-loop molten salt pump 2, a molten salt pool 3, a molten salt pool temperature monitoring system 4, a molten salt pool temperature measuring system 5 and a FLiNaK-CO₂A heat exchanger 6 and a supercritical carbon dioxide Brayton cycle system 9; an outlet of the modular reactor 1 is connected with an inlet of a molten salt pool 3, an outlet of the molten salt pool 3 is connected with an inlet of a two-loop molten salt pump 2, and an outlet of the two-loop molten salt pump 2 is connected with an inlet of the modular reactor 1; molten salt pool temperature measurement system 5 and FLiNaK-CO₂The heat exchanger 6 is positioned in the molten salt pool 3, the molten salt pool temperature monitoring system 4 is positioned outside the molten salt pool 3 and is connected with the molten salt pool temperature measuring system 5, and the FLiNaK-CO₂The cold side of the heat exchanger 6 is connected with a supercritical carbon dioxide Brayton cycle system 9, and a power generation device in the supercritical carbon dioxide Brayton cycle system 9 is connected with a power grid 10;

the water electrolysis hydrogen production system and the nuclear reactor power generation system share a supercritical carbon dioxide Brayton cycle system 9, and further comprise a water supply system 11, a water electrolysis hydrogen production device 12, a power dispatching system 13 and an H₂Collecting device 14 and O₂The collecting device 15, the supercritical carbon dioxide Brayton cycle system 9 are connected with the power dispatching system 13, the power dispatching system 13 is connected with the electrolyzed water hydrogen production device 12, the water supply system 11 is connected with the water supply inlet of the electrolyzed water hydrogen production device 12, and the electrolyzed water hydrogen production device 12H₂Outlet and H₂The inlet of the collecting device 14 is connected with the hydrogen production device 12O by electrolyzing water₂Outlet and O₂The collecting device 15 is connected;

water supply system 11 and H shared by thermochemical hydrogen production system and electrolytic water hydrogen production system₂Collecting device 14 and O₂The collecting device 15 also comprises a FLiNaK-FLiNaK heat exchanger 7 and a thermochemical hydrogen production device 16, the FLiNaK-FLiNaK heat exchanger 7 is positioned in the molten salt pool 3, and the cold side outlet and the thermalization of the FLiNaK-FLiNaK heat exchanger 7 are realizedThe learning hydrogen production device 16 fused salt inlet is connected, the thermochemical hydrogen production device 16 fused salt outlet is connected with the cold side inlet of the FLiNaK-FLiNaK heat exchanger 7, the water supply system 11 is connected with the thermochemical hydrogen production device 16 water supply inlet, and the thermochemical hydrogen production device 16H₂Outlet and H₂The inlet of the collecting device 14 is connected with a thermochemical hydrogen production device 16O₂Outlet and O₂The collecting device 15 is connected;

the high-temperature process heat utilization system comprises a low-temperature FLiNaK heat exchanger 8 and a high-temperature process heat application place 17, wherein the low-temperature FLiNaK heat exchanger 8 is positioned in the molten salt pool 3, and the cold side of the low-temperature FLiNaK heat exchanger 8 is connected with the high-temperature process heat application place 17.

As a preferred embodiment of the present invention, the FLiNaK-CO is₂The heat exchanger 6 is positioned at the upper part of the FLiNaK-FLiNaK heat exchanger 7, and the low-temperature FLiNaK heat exchanger 8 is positioned at the lower part of the FLiNaK-FLiNaK heat exchanger 7.

As a preferred embodiment of the present invention, FLiNaK-CO₂The heat exchanger 6 is a printed circuit plate type heat exchanger, and the FLiNaK-FLiNaK heat exchanger 7 and the low-temperature FLiNaK heat exchanger 8 are shell-and-tube heat exchangers;

as a preferred embodiment of the invention, the outlet temperature of a modular reactor 1 in a nuclear reactor power generation system is 690-700 ℃, and FLiBe salt is used as a main coolant, LiF and BeF of the modular reactor 1₂The molar numbers of (A) are 67% and 33%, respectively; the two-loop neutralization thermochemical hydrogen production system in which the two-loop molten salt pump 2 is located adopts FLiNaK salt as a circulating working medium, and the mole fractions of LiF, NaF and KF are 46.5%, 11.5% and 42% respectively.

As a preferred embodiment of the present invention, the modular reactor 1 is of modular design, the main heat exchanger is located inside the reactor vessel, thereby eliminating large break accidents; the thermal power of the modular reactor 1 is 125MW, and when the heat energy demand of the nuclear reactor power generation system, the water electrolysis hydrogen production system and the high-temperature process heat utilization system exceeds the heat production capacity of a single modular reactor 1, the configuration number of the modular reactors 1 can be increased.

In a preferred embodiment of the present invention, when the power generation of the nuclear reactor power generation system is excessive, part of the power is transmitted to the water electrolysis hydrogen production system through the power scheduling system 13 to produce hydrogen.

As a preferred embodiment of the invention, the hydrogen production system by water electrolysis has an electrolysis efficiency of 90%.

As a preferred embodiment of the invention, the thermochemical hydrogen production system adopts a copper-chlorine cycle to produce hydrogen, the temperature required by the cycle is lower than 700 ℃, and the water is decomposed into H by copper and chloride₂And O₂The intermediate chemical reaction forms a closed internal circulation and does not emit any greenhouse gases.

As a preferred embodiment of the invention, the molten salt pool temperature measuring system 5 measures the temperatures of different depths in the molten salt pool 3, the molten salt pool temperature monitoring system 4 monitors the temperature measured by the molten salt pool temperature measuring system 5, and the molten salt pool temperature monitoring system 4 feeds the temperature results back to the supercritical carbon dioxide Brayton cycle system 9, the thermochemical hydrogen production system and the high temperature process heat utilization system, so as to ensure that the systems obtain heat with sufficient temperature.

As a preferred embodiment of the present invention, the high temperature process heat application site 17 includes petroleum refining, seawater desalination, coal liquefaction, natural gas production, ethanol production, and the like.

As a preferred embodiment of the present invention, the pure water of the water supply system 11 may be pure water obtained by desalinating seawater in the high-temperature process heat application site 17;

as a preferred embodiment of the present invention, the supercritical carbon dioxide Brayton cycle system 7 in the nuclear reactor power generation system uses CO₂As a circulating working fluid and the cold side cooling working fluid is air.

In a preferred embodiment of the present invention, the thermal efficiency of the supercritical carbon dioxide brayton cycle system 7 in the nuclear reactor power generating system is greater than 45%.

The working method of the small-sized villiaumite cooling high-temperature reactor and high-temperature process thermal coupling utilization system comprises the following steps: the modularized reactor 1 is used as a heat source of a nuclear reactor power generation system, molten salt with lower temperature in the molten salt pool 3 is pressurized by the two-loop molten salt pump 2, enters the modularized reactor 1 for heating and warming, flows into the molten salt pool 3 for storing heat and heating FLiNaK-CO₂Cold side of heat exchanger 6CO of₂FLiNaK salt on the cold side of the FLiNaK-FLiNaK heat exchanger 7 and a circulating working medium on the cold side of the low-temperature FLiNaK heat exchanger 8, namely FLiNaK-CO₂CO heated in Heat exchanger 6₂Completing circulation in the supercritical carbon dioxide Brayton cycle system 9 and delivering electrical energy to the grid 10;

when the power generation of the nuclear reactor power generation system is excessive, a part of the electric power from the supercritical carbon dioxide brayton cycle system 9 is distributed to the electrolytic water hydrogen production system by the electric power scheduling system 13, and the electric power is input to the electrolytic water hydrogen production apparatus 12 to electrolyze pure water from the water supply system 11 to precipitate H₂And O₂Are respectively stored in H₂Collecting device 14 and O₂In the collecting device 15;

the high-temperature FLiNaK salt in the molten salt pool 3 heats the FLiNaK salt on the cold side of the FLiNaK-FLiNaK heat exchanger 7, the high-temperature FLiNaK salt enters a thermochemical hydrogen production device 16, and the thermochemical hydrogen production device 16 decomposes pure water from a water supply system 11 into H by utilizing copper-chlorine circulation₂And O₂Are respectively stored in H₂Collecting device 14 and O₂In the collecting device 15, the FLiNaK salt after heat release enters the cold side of the FLiNaK-FLiNaK heat exchanger 8 after being pressurized and is heated again;

the high-temperature FLiNaK salt in the molten salt pool 3 heats the circulating working medium on the cold side of the low-temperature FLiNaK heat exchanger 8, the circulating working medium flows through the high-temperature process heat application site 17 after absorbing heat, the process flows of sites such as petroleum refining, seawater desalination, coal liquefaction, natural gas production, ethanol production and the like are realized, and the circulating working medium after releasing heat flows back to the cold side of the low-temperature FLiNaK heat exchanger 8 to be heated again.