A modular molten salt handling and storage system

Abstract

The present application relates to a kind of modular molten salt loading and storage system, including vertical support structure rack, normal temperature electrical equipment group and high temperature molten salt equipment group are physically separated by isolation fence and integrated in it;High temperature molten salt equipment group includes molten salt storage tank and molten salt pipeline connected with molten salt storage tank;Molten salt pipeline includes molten salt loading pipe, molten salt loading pipe has upward inclination relative to horizontal plane, to realize the self-weight backflow of molten salt;The middle section of molten salt loading pipe is connected with molten salt isolation valve, and molten salt isolation valve and normal temperature electrical equipment group are cooperated to realize the on-off control of molten salt loading pipe.The present application effectively avoids the thermal influence of high temperature environment on normal temperature electrical equipment by isolation fence, and the integrated design of overall modularization integrates the core equipment of molten salt loading and storage into one, discards the traditional dispersed equipment arrangement and installation mode, greatly simplifies the field construction process, reduces installation period, also makes the debugging, maintenance and overhaul of system more convenient.

Description

Technical Field

[0001] This invention relates to the field of thorium-based molten salt reactor nuclear power technology, and more specifically to a modular molten salt loading, unloading and storage system. Background Technology

[0002] The secondary loop of a thorium-based molten salt reactor uses high-temperature molten salt as the core heat transfer medium. The molten salt loading, unloading and storage system is a key subsystem that ensures the quantitative loading of molten salt in the secondary loop and the safe discharge under emergency conditions. It mainly consists of core equipment such as molten salt storage tanks, molten salt loading pipelines, support structures and molten salt isolation valves. Its functional stability directly determines the operational safety of the secondary loop and even the entire reactor.

[0003] Currently, the molten salt loading, unloading, and storage equipment in the secondary loop of thorium-based molten salt reactors generally adopts a decentralized design and layout scheme: molten salt tanks, molten salt loading pipelines, supporting structures, and molten salt isolation valves are all independently designed and manufactured separately. After being transported to the nuclear power plant building, they are then located, assembled, and installed on-site according to the building structure. In this model, the interface locations and pipeline routes of each piece of equipment must be confirmed one by one based on the site conditions, making it impossible to complete system-level functional integration before delivery.

[0004] The aforementioned distributed approach suffers from numerous technical drawbacks. First, insufficient system testing and verification: before the overall on-site installation is complete, only individual equipment can be tested independently. It's impossible to verify the entire process of molten salt loading, discharge, and storage at the system level, failing to meet the stringent reliability requirements of nuclear power equipment and failing to expose systemic issues such as interface compatibility and pipeline flow patterns in advance. Second, high on-site construction difficulty and low reliability: On-site installation procedures are complex, and some special connection processes for interfaces cannot be implemented in the plant environment, leading to decreased reliability of inter-equipment interface connections. Simultaneously, multi-step on-site operations make it difficult to maintain the high cleanliness standards required by nuclear power equipment, increasing the risk of molten salt contamination. Furthermore, low operation and maintenance efficiency: when a system malfunctions, only individual equipment can be checked one by one, making it impossible to conduct overall verification and localization at the functional module level. This results in long maintenance cycles, low efficiency, and the fact that different equipment is handled by different maintenance personnel, making coordination difficult. In addition, the factory planning and space utilization are inefficient: the decentralized layout requires separate planning of the installation space, pipeline routes and electrical control lines for each piece of equipment, which not only occupies a larger factory area, but also makes the layout of the control system and electrical system complicated, making it difficult to achieve effective unity between equipment function and system design.

[0005] Furthermore, in existing systems, there is no effective physical separation between high-temperature molten salt equipment and ambient-temperature electrical equipment (such as induction heating cabinets, fans, and vacuum units). During operation of the high-temperature molten salt equipment (molten salt temperatures can reach over 450℃, and even with external insulation, the ambient temperature remains high), the aging of ambient-temperature electrical equipment is accelerated, reducing the long-term operational stability of the system. Simultaneously, the decentralized design incurs high costs and long installation cycles, failing to meet the demands of efficient construction and convenient operation and maintenance for thorium-based molten salt reactor engineering applications.

[0006] In summary, existing decentralized molten salt loading, unloading and storage systems have significant shortcomings in testing and verification, on-site construction, operation and maintenance, space utilization and equipment reliability. They can no longer meet the engineering requirements of high reliability, high cleanliness and easy operation and maintenance for the secondary loop of thorium-based molten salt reactors. There is an urgent need for a new integrated design solution to systematically solve the above problems. Summary of the Invention

[0007] To address the problems of difficult on-site installation, inconvenient system testing and maintenance caused by the dispersed layout of equipment in the prior art, and the lack of separation between high-temperature and normal-temperature equipment which easily leads to the aging of electrical equipment, this invention aims to provide a modular molten salt loading, unloading and storage system.

[0008] According to the modular molten salt loading, unloading, and storage system of the present invention, it includes a vertical support structure frame, which integrates a room temperature electrical equipment group and a high temperature molten salt equipment group. An isolation barrier is provided between the room temperature electrical equipment group and the high temperature molten salt equipment group to achieve physical separation. The high temperature molten salt equipment group includes a molten salt storage tank and a molten salt pipeline connected to the molten salt storage tank. The molten salt pipeline includes a molten salt loading pipe, which has an upward inclination angle relative to the horizontal plane to achieve the gravity-fed backflow of molten salt. A molten salt isolation valve is connected in series in the middle section of the molten salt loading pipe. The molten salt isolation valve works in conjunction with the room temperature electrical equipment group to achieve the on / off control of the molten salt loading pipe.

[0009] In a preferred embodiment, the ambient temperature electrical equipment group includes a high-frequency induction heating cabinet and a fan; the molten salt isolation valve includes a refrigeration valve body; the high-frequency induction heating cabinet and the fan work together on the refrigeration valve body to cut off and melt the molten salt loading tube.

[0010] In a preferred embodiment, the molten salt isolation valve further includes a fan duct and an induction heating copper busbar; the air inlet of the fan duct is connected to the fan, and the air outlet is directly opposite the molten salt flow section of the refrigeration valve body; the induction heating copper busbar tightly covers the outside of the refrigeration valve body and is electrically connected to the high-frequency induction heating cabinet; the refrigeration valve body realizes the on / off control of the molten salt loading pipe through the cooperation of the air-cooling plug and the induction heating melting.

[0011] In a preferred embodiment, the top of the molten salt storage tank is provided with a plurality of functional interfaces arranged in an orderly manner around the periphery. The plurality of functional interfaces include at least a vacuum unit interface, a gas pipeline interface, a molten salt transfer pipe interface, and a molten salt loading pipe interface, and each of the functional interfaces is respectively sealed and connected to the corresponding pipeline.

[0012] In a preferred embodiment, the ambient temperature electrical equipment group further includes a vacuum unit, the vacuum unit interface being connected to the vacuum unit via a vacuum unit pipe; the gas pipeline interface being connected to an external gas system via a gas pipeline; the molten salt transfer pipe interface being connected to an external molten salt transfer tank via a molten salt transfer pipe; and the molten salt loading pipe interface being connected to a secondary circuit pipeline via a molten salt loading pipe.

[0013] In a preferred embodiment, an operating platform is also provided on the supporting structure frame, and the operating platform is at the same height as the interface area of ​​the molten salt storage tank.

[0014] In a preferred embodiment, the vertical support structure is formed by welding H-beams, with grating plates laid on its bottom and top layers. The isolation fence is integrated with the support structure. The molten salt storage tank is installed on the bottom grating plate of the support structure via adjustable movable supports. At least two sets of ladders are also provided on the support structure, which respectively connect the ground to the top grating plate of the support structure and the ground to the operating platform.

[0015] In a preferred embodiment, the upward tilt angle of the molten salt loading tube is 2°-5°.

[0016] In a preferred embodiment, the support structure platform is further provided with pipe supports for fixing and supporting the molten salt pipeline. The pipe supports are divided into constant force supports and fixed supports, both of which are arranged on the top frame of the support structure platform and are used to fix and support all molten salt pipelines leading out from the molten salt tank interface.

[0017] This invention integrates the ambient temperature electrical equipment group and the high-temperature molten salt equipment group onto the same vertical support structure and physically separates them with an isolation barrier. This effectively avoids the thermal impact of the high-temperature environment on the ambient temperature electrical equipment, slows down equipment aging, and improves the overall stability and service life of the system. The upward tilt angle of the molten salt loading pipe, combined with the coordinated on / off control of the molten salt isolation valve and the ambient temperature electrical equipment group, enables the smooth return of molten salt by its own weight, eliminating the need for additional power supply equipment. This simplifies the system structure while improving the response efficiency of molten salt discharge. The overall modular integrated design integrates the molten salt... The core equipment for loading, unloading, and storage is integrated into one unit, abandoning the traditional decentralized equipment layout and installation method. This greatly simplifies the on-site construction process, shortens the installation cycle, and makes the system's debugging, maintenance, and repair more convenient. It enables rapid troubleshooting and fault location of the overall functions. At the same time, the compact layout reduces the space occupied in the plant. It solves a series of problems caused by the traditional decentralized layout, such as high construction difficulty, low operation and maintenance efficiency, equipment susceptibility to high temperatures, and inefficient space utilization. This comprehensively improves the practicality and reliability of the thorium-based molten salt reactor secondary loop molten salt loading, unloading, and storage system. Attached Figure Description

[0018] Figure 1 This is a general three-dimensional schematic diagram of the modular molten salt loading, unloading and storage system according to the present invention.

[0019] Figure 2 yes Figure 1 Front view.

[0020] Figure 3 yes Figure 2 A partial enlarged view of the refrigeration valve assembly.

[0021] Figure 4 yes Figure 2 A magnified view of the interface of the molten salt storage tank.

[0022] Figure 5 yes Figure 1 Top view.

[0023] Figure 6 yes Figure 1 Side view. Detailed Implementation

[0024] The following is combined with Figures 1-6 The modular molten salt loading, unloading and storage system according to the present invention will be described in detail. The embodiments are only used to explain the present invention and are not intended to limit the scope of protection of the present invention.

[0025] The core of this invention is modular integrated design, which integrates all the key equipment for loading, unloading and storing molten salt in the secondary loop of the thorium-based molten salt reactor into a vertical support structure frame made of H-beams. Isolation barriers are set up to physically separate the room temperature electrical equipment from the high temperature molten salt equipment. The design of the molten salt loading pipeline is optimized and the on / off control structure of the refrigeration valve is integrated. This solves the technical problems of the prior art, such as the dispersed layout of equipment, insufficient testing and verification, inconvenient construction and maintenance, and easy aging of equipment, and realizes the functions of safe loading, rapid release and stable storage of molten salt medium.

[0026] like Figure 1 As shown, the modular molten salt loading, unloading, and storage system according to the present invention has a regular vertical modular layout. The equipment is integrated within the same supporting structure, enabling overall transportation and installation, significantly simplifying the on-site construction process. Specifically, the supporting structure is a vertical frame formed by welding rectangular H-beams, serving as the load-bearing foundation of the entire system. Its dimensions directly limit the overall size of the modules, allowing the plant to be planned and arranged in advance according to the module dimensions, eliminating the need to consider the individual placement of multiple devices and achieving efficient space utilization. The bottom and top layers of the supporting structure are covered with grating plates, which have a perforated structure, providing ventilation and heat dissipation for the equipment and facilitating bottom and top maintenance operations by operators.

[0027] The modular molten salt loading, unloading, and storage system according to the present invention includes a group of ambient temperature electrical equipment and a group of high-temperature molten salt equipment separated by a partition 29. The partition 29 is made of the same material as H-beams and is integrated with the supporting structural frame. It is positioned between the ambient temperature electrical equipment group and the high-temperature molten salt equipment group to physically separate the two types of equipment, preventing the heat radiation from the high-temperature molten salt equipment from accelerating the aging of the ambient temperature electrical equipment and improving the long-term operational stability of the system. Figure 2 As shown, the ambient temperature electrical equipment group includes a high-frequency induction heating cabinet 01, a fan 02, and a vacuum unit 03, which are centrally located on the left side of the supporting structure. The high-temperature molten salt equipment group includes a molten salt storage tank 08 and various molten salt pipelines extending upwards from the tank interface, which are centrally located on the right and central sides of the supporting structure. The molten salt storage tank 08 is a horizontal, high-temperature resistant molten salt storage tank, installed on the right side of the bottom grating plate of the supporting structure via a movable support 09. The movable support 09 is a height-adjustable steel support, which allows for precise horizontal and height calibration of the molten salt storage tank 08, facilitating installation and subsequent maintenance calibration. The molten salt storage tank 08 is entirely covered with heat tracing insulation 28, which consists of an insulation layer, thermocouples, and connecting cables. The thermocouples are embedded in the insulation layer to monitor the tank wall temperature in real time, and the connecting cables are connected to external temperature control equipment to achieve heat tracing and insulation of the tank, preventing the molten salt inside from solidifying.

[0028] like Figures 1-6As shown, the modular molten salt loading, unloading, and storage system according to the present invention also includes pipe supports 04, cable trays 06, operating platforms 27, large ladders 05, and small ladders 07. Pipe supports 04 are divided into constant-force supports and fixed supports, both arranged on the top frame of the supporting structure. The constant-force supports are used to absorb the deformation caused by thermal expansion and contraction of the pipes, while the fixed supports are used to fix key nodes of the pipes. All types of molten salt pipelines leading from the interface of the molten salt storage tank 08 are fixedly supported by pipe supports 04, ensuring the stability and reliability of the pipeline layout and preventing displacement of the pipelines due to vibration and thermal expansion and contraction. Cable trays 06 are laid along the supporting structure frame and are enclosed steel trays, carrying the connection lines of various electrical equipment. This achieves compact layout and protection of the lines, avoiding the influence of high-temperature molten salt equipment on the lines, while also making the line layout neat and facilitating later line maintenance. The operating platform 27 is a horizontal platform structure composed of grating plates, flat plates, and steel supports. It is fixed to the vertical frame of the supporting structure by welding multiple diagonal supports. The platform surface is flush with the interface area of ​​the molten salt storage tank 08, providing operators with a stable operating space. Operations such as disassembling and assembling the molten salt storage tank interfaces, reading and calibrating measuring instruments, and taking samples from the sampling tubes can be directly performed on the operating platform, significantly improving operational convenience. Both the large ladder 05 and the small ladder 07 are steel ladders, arranged vertically along the supporting structure. The large ladder 05 connects the ground to the top grating plate of the supporting structure, facilitating operators' inspection and maintenance of the top-level pipes and pipe supports 04. The small ladder 07 connects the ground to the operating platform 27, facilitating operators' operation of various interfaces of the molten salt storage tank 08.

[0029] like Figures 1-6 As shown, the modular molten salt loading, unloading, and storage system according to the present invention also includes a vacuum unit interface 13, a vacuum unit pipe 21, a gas pipeline interface a14, a gas pipeline interface b18, a gas pipeline 22, a sampling pipe interface 17, a molten salt transfer pipe interface 19, a molten salt transfer pipe 25, a measuring instrument interface a15, a measuring instrument interface b16, a molten salt loading pipe interface 20, a molten salt loading pipe 24, and a refrigeration valve body 10. The various functional interfaces on the top of the molten salt storage tank 08 are respectively sealed and connected to their corresponding pipelines. The vacuum unit interface 13 is connected to the vacuum unit 03 through the vacuum unit pipe 21 to extract air and water oxygen from the storage tank. The gas pipeline interface a14 and the gas pipeline interface b18 are connected to the external gas system through the gas pipeline 22 to achieve precise pressure control within the storage tank and provide power for molten salt loading. The sampling pipe interface 17 is a dedicated interface for molten salt sampling and testing, which can extract molten salt from the tank in real time for composition and temperature detection. Molten salt transfer pipe interface 19 connects to an external molten salt transfer tank via molten salt transfer pipe 25, serving as the channel for molten salt input into the storage tank. Molten salt loading pipe interface 20 connects to the secondary circuit pipeline via molten salt loading pipe 24, serving as the core channel for molten salt entering and exiting the storage tank. Molten salt loading pipe 24 is at a preset height above the ground, and no other equipment is arranged below it, forming a maintenance passage accessible to personnel. Figure 2 As shown, the molten salt loading pipe 24 is inclined upwards at an angle of 2°-5°, for example, 3°, from right to left (the measurement reference is the horizontal plane), providing a structural basis for the molten salt's gravity reflux. After the molten salt loading pipe 24 is led out from the molten salt loading pipe interface 20 of the molten salt storage tank 08, it is... Figure 2 and Figure 5 The system is laid out with a pre-designed, winding path, extending to the secondary circuit connection point on the outside of the supporting structure. Its horizontal layout provides ample maintenance access for the system. Both the molten salt loading pipe 24 and the molten salt transfer pipe 25 are covered with heat tracing insulation 28. The arrangement principle is consistent with the heat tracing insulation of the molten salt storage tank 08, with only adjustments made to the insulation layer size and thermocouple specifications to prevent molten salt from solidifying inside the pipes and ensure smooth molten salt flow. Figure 4 As shown, the vacuum unit interface 13, gas pipeline interface a14, gas pipeline interface b18, sampling pipe interface 17, molten salt transfer pipe interface 19, measuring instrument interface a15, measuring instrument interface b16, and molten salt loading pipe interface 20 are arranged in an orderly manner along the top circumference of the molten salt storage tank 08, without interfering with each other. Each interface corresponds to a specific function, namely, tank vacuuming, pressure control, parameter monitoring, molten salt sampling, molten salt input, and molten salt output. Each interface is a standardized design and can be directly and quickly connected to the corresponding pipeline without the need for secondary processing on site.

[0030] like Figures 1-6 As shown, the modular molten salt loading, unloading, and storage system according to the present invention also includes a refrigeration valve body 10, a fan duct 11, and an induction heating copper busbar 12. The air outlet of the fan duct 11 is directly opposite the molten salt flow section of the refrigeration valve body 10, and the air inlet is sealed to the fan 02, which can accurately blow the cold air generated by the fan 02 onto the valve body to achieve rapid cooling of the valve body, causing the molten salt inside the valve body to solidify and form a freeze blockage. The induction heating copper busbar 12 is made of copper and is tightly wrapped around the outside of the refrigeration valve body 10. Its terminals are electrically connected to the high-frequency induction heating cabinet 01, which can convert the high-frequency alternating current generated by the high-frequency induction heating cabinet 01 into a high-frequency alternating magnetic field, causing the refrigeration valve body 10 to generate induced eddy currents and rapidly heat up, thereby heating the solidified molten salt inside the valve body to above its melting point, achieving molten salt melting. The refrigeration valve body 10 is connected in series in the middle section of the molten salt loading pipe 24. It is a special molten salt valve component that is resistant to high temperature and molten salt corrosion. It works in conjunction with the high-frequency induction heating cabinet 01 and the fan 02 to cut off and melt the molten salt loading pipe 24. When the fan 02 is working, the air cooling causes the molten salt in the valve body to solidify and form a freeze blockage (the deep freeze blockage temperature threshold is below 100℃, and the normal freeze blockage is below the melting point of molten salt by 100℃. The freeze blockage state requires a continuous supply of cold air), cutting off the flow of molten salt. When the high-frequency induction heating cabinet 01 is working, the induction heating melts the solidified molten salt in the valve body, restoring the flow of molten salt. The seal is achieved by utilizing the freeze blockage of the molten salt itself, which can achieve zero leakage of molten salt medium and eliminate the risk of leakage and damage of traditional seals under high temperature and corrosive conditions.

[0031] like Figures 1-6 As shown, the modular molten salt loading, unloading, and storage system according to the present invention also includes auxiliary on / off components such as ball valves 23 and mechanical isolation valves 26, used to maintain the cleanliness of the equipment within the module during transportation or individual placement. Ball valves 23 are located on branches of various pipelines to achieve on / off control of pipeline branches and media diversion. Mechanical isolation valves 26 are located at the secondary circuit connection end of the molten salt loading pipe 24, serving as a secondary isolation component, and are used in conjunction with the refrigeration valve body 10 to form double isolation protection, further enhancing the safety of system operation.

[0032] The core advantage of the modular molten salt loading, unloading, and storage system described in this invention lies in its modular integrated design. After the manufacturer completes the testing and acceptance of individual devices, all interfaces within the module can be assembled directly on-site. Special connection processes for some interfaces (the process type is designed separately according to the different devices connected to the interface) are completed. After assembly, the entire system undergoes full-process functional testing and acceptance, ensuring the high cleanliness required for nuclear power equipment. Once the tests are passed, the module is transported as a whole to the thorium-based molten salt reactor building. Only the external interfaces of the module need to be connected to the external system for it to be put into use, significantly simplifying the on-site installation process and shortening the construction cycle.

[0033] The modular molten salt loading, unloading and storage system according to the present invention mainly realizes two core functions: molten salt loading and molten salt release.

[0034] The molten salt loading function enables the quantitative delivery of molten salt from an external transfer tank to the secondary loop of the thorium-based molten salt reactor. This process begins with on-site module installation. The modular molten salt loading, unloading, and storage system is transported to the designated location within the thorium-based molten salt reactor plant. The secondary loop connection of the molten salt loading pipe 24 is connected to the secondary loop pipeline; the molten salt transfer pipe 25 is connected to the external molten salt transfer tank; the gas pipe 22 is connected to the external gas system; and the vacuum unit 03 is connected to the external control equipment. This completes the rapid connection of the module's external interfaces, enabling on-site installation of the entire system without the need for on-site equipment assembly or interface processing.

[0035] The molten salt loading function then includes vacuuming to remove water and oxygen. Vacuum unit 03 is started, and air, water, and oxygen are removed from the molten salt storage tank 08 through vacuum unit pipe 21 until the external measuring instruments (connected to measuring instrument interfaces a15 and b16) display that the pressure and water / oxygen content inside the tank reach the preset standards for nuclear power molten salt operation. Vacuum unit 03 is then stopped to prevent the molten salt from contacting air and undergoing component transformation.

[0036] The molten salt loading function then includes molten salt entering the tank. The discharge valve of the external molten salt transfer tank is opened, and molten salt enters the molten salt storage tank 08 through the molten salt transfer pipe 25 and the molten salt transfer pipe interface 19 until the amount of molten salt in the storage tank reaches the preset value, and then the discharge valve of the molten salt transfer tank is closed.

[0037] The molten salt loading function then includes pressurized salt delivery. Pressurized gas is introduced into the molten salt storage tank 08 through the gas pipe 22. The pressure inside the storage tank is precisely controlled by the gas pipe interfaces a14 and b18. Under pressure, the molten salt enters the molten salt loading pipe 24 through the molten salt loading pipe interface 20, passes through the refrigeration valve body 10, and enters the secondary circuit pipeline to participate in the heat exchange of the secondary circuit.

[0038] The molten salt loading function then includes freezing and shut-off. When the molten salt medium in the secondary loop reaches the preset amount, pressurization into the molten salt storage tank 08 is stopped to maintain stable pressure in the tank; at the same time, the high-frequency induction heating cabinet 01 is shut down, and the fan 02 is started. The fan 02 continuously supplies cold air to the refrigeration valve body 10 through the fan duct 11, causing the molten salt in the valve body to cool down to a freezing state, cutting off the flow channel of the molten salt loading pipe 24, and the molten salt medium can then circulate normally in the secondary loop.

[0039] In particular, the refrigeration valve body 10 utilizes the freezing blockage of molten salt to achieve sealing, eliminating the need for traditional sealing components and achieving zero leakage of molten salt media. This effectively solves the technical problems of traditional sealing components being prone to leakage and damage under high temperature and corrosive molten salt conditions.

[0040] The molten salt release function enables the rapid and safe return of molten salt in the secondary circuit to the molten salt storage tank 08 after the test conditions have ended or in emergency conditions (accident conditions in the primary circuit or critical equipment accidents in the secondary circuit). This first involves stopping the air cooling. The blower 02 is turned off, and the air cooling of the refrigeration valve body 10 is stopped, in preparation for the molten salt to melt.

[0041] The molten salt release function then includes heating and melting. The high-frequency induction heating cabinet 01 is activated, and the refrigeration valve body 10 is induction heated by the induction heating copper busbar 12, so that the solidified molten salt in the valve body gradually melts and the flow channel of the molten salt loading pipe 24 is restored.

[0042] The molten salt release function then includes gravity return. Since the molten salt loading pipe 24 is inclined upward at a 3° angle from right to left (the measurement reference is the horizontal plane), the molten salt in the secondary circuit flows in the opposite direction along the molten salt loading pipe 24 under its own gravity, passes through the refrigeration valve body 10, and then flows back into the molten salt storage tank 08 through the molten salt loading pipe interface 20, thus completing the molten salt release.

[0043] The molten salt release function then includes operational condition restoration. After the molten salt release is completed, the fan 02 can be restarted to restore the refrigeration valve body 10 to its frozen state, or the high-frequency induction heating cabinet 01 can be shut down and system protection measures can be implemented, awaiting further operations, depending on the actual operational requirements.

[0044] In particular, the molten salt release relies on gravity backflow, eliminating the need for additional power transmission equipment. Combined with the modular integrated structural design, this significantly improves the system's emergency response capability and operational reliability.

[0045] Through the above-mentioned modular integrated design and functional implementation method, this invention realizes the integration, intensification and convenience of the molten salt loading, unloading and storage system of the secondary loop of the thorium-based molten salt reactor. Compared with the existing decentralized layout technical solutions, it has significant improvements in testing and verification, transportation and installation, operation and maintenance and space utilization, and meets the stringent requirements of nuclear power equipment for high reliability, high cleanliness and easy operation and maintenance.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A modular molten salt loading, unloading, and storage system, characterized in that, The modular molten salt loading, unloading, and storage system includes a vertical support structure frame, which integrates a room-temperature electrical equipment group and a high-temperature molten salt equipment group. A partition is installed between the room-temperature electrical equipment group and the high-temperature molten salt equipment group to achieve physical separation. The high-temperature molten salt equipment group includes a molten salt storage tank and molten salt pipelines connected to the storage tank. The molten salt pipelines include a molten salt loading pipe with an upward inclination relative to the horizontal plane to achieve gravity-driven backflow of the molten salt. A molten salt isolation valve is connected in series in the middle section of the molten salt loading pipe. The molten salt isolation valve works in conjunction with the room-temperature electrical equipment group to control the on / off state of the molten salt loading pipe.

2. The modular molten salt loading, unloading, and storage system according to claim 1, characterized in that, The ambient temperature electrical equipment group includes a high-frequency induction heating cabinet and a fan; the molten salt isolation valve includes a refrigeration valve body; the high-frequency induction heating cabinet and the fan work together to cut off and melt the molten salt loading tube.

3. The modular molten salt loading, unloading, and storage system according to claim 2, characterized in that, The molten salt isolation valve also includes a fan duct and an induction heating copper busbar; the air inlet of the fan duct is connected to the fan, and the air outlet is directly opposite the molten salt flow section of the refrigeration valve body; the induction heating copper busbar tightly covers the outside of the refrigeration valve body and is electrically connected to the high-frequency induction heating cabinet; the refrigeration valve body realizes the on / off control of the molten salt loading pipe through the cooperation of the air-cooling plug and the induction heating melting.

4. The modular molten salt loading, unloading, and storage system according to claim 1, characterized in that, The top of the molten salt storage tank is provided with multiple functional interfaces arranged in an orderly manner around the perimeter. The multiple functional interfaces include at least a vacuum unit interface, a gas pipeline interface, a molten salt transfer pipe interface, and a molten salt loading pipe interface. Each of the functional interfaces is sealed and connected to the corresponding pipeline.

5. The modular molten salt loading, unloading, and storage system according to claim 4, characterized in that, The ambient temperature electrical equipment group also includes a vacuum unit, the vacuum unit interface is connected to the vacuum unit through a vacuum unit pipe; the gas pipeline interface is connected to an external gas system through a gas pipeline; the molten salt transfer pipe interface is connected to an external molten salt transfer tank through a molten salt transfer pipe; and the molten salt loading pipe interface is connected to a secondary circuit pipeline through a molten salt loading pipe.

6. The modular molten salt loading, unloading, and storage system according to claim 4, characterized in that, An operating platform is also provided on the supporting structure frame, and the operating platform is at the same height as the interface area of ​​the molten salt storage tank.

7. The modular molten salt loading, unloading, and storage system according to claim 6, characterized in that, The vertical support structure is formed by welding H-beams, with grating plates laid on its bottom and top layers. The isolation fence is integrated with the support structure. The molten salt storage tank is installed on the bottom grating plate of the support structure via adjustable movable supports. At least two sets of ladders are also provided on the support structure, which respectively connect the ground to the top grating plate of the support structure and the ground to the operating platform.

8. The modular molten salt loading, unloading, and storage system according to claim 1, characterized in that, The upward tilt angle of the molten salt loading tube is 2°-5°.

9. The modular molten salt loading, unloading, and storage system according to claim 1, characterized in that, The supporting structure platform is also equipped with pipe supports for fixing and supporting the molten salt pipeline. The pipe supports are divided into constant force supports and fixed supports, which are arranged on the top frame of the supporting structure platform and are used to fix and support all molten salt pipelines leading out from the interface of the molten salt storage tank.

Images