阅读说明：本技术 一种熔盐堆燃料制备与装卸系统 (Molten salt reactor fuel preparation and handling system ) 是由 冀锐敏 严睿 汤睿 邹杨 于世和 李明海 于 2020-06-30 设计创作，主要内容包括：本发明公开了一种熔盐堆燃料制备与装卸系统。该系统包括装料罐和备料罐,并与反应堆系统连接；其中,反应堆系统的运行液位限值处连接一液位控制管路；备料罐为一封闭空间；备料罐中的上部还设有至少一个定量一罐；定量一罐和备料罐之间设有一加料控制管路,加料控制管路的入口设于备料罐底部,加料控制管路穿设于定量一罐的罐体、且加料控制管路的出口设于定量一罐的上部,用于控制加料量。本发明的熔盐堆燃料制备与装卸系统能够实现对添加盐的精确控制,且能够有效控制反应堆系统中燃料盐的液位,设备简单、占地面积小,简化了熔盐堆加料操作,降低熔盐堆中部分设备的测量精度需求,安全可靠,灵活度高。(The invention discloses a molten salt reactor fuel preparation and loading and unloading system. The system comprises a charging tank and a material preparing tank, and is connected with a reactor system; wherein, the operating liquid level limit of the reactor system is connected with a liquid level control pipeline; the material preparing tank is a closed space; the upper part of the material preparing tank is also provided with at least one quantitative tank; a feeding control pipeline is arranged between the first quantitative tank and the material preparation tank, the inlet of the feeding control pipeline is arranged at the bottom of the material preparation tank, the feeding control pipeline penetrates through the tank body of the first quantitative tank, and the outlet of the feeding control pipeline is arranged on the upper portion of the first quantitative tank and used for controlling the feeding amount. The molten salt reactor fuel preparation and handling system provided by the invention can realize accurate control on salt addition, can effectively control the liquid level of fuel salt in the reactor system, is simple in equipment and small in occupied area, simplifies the molten salt reactor charging operation, reduces the measurement accuracy requirement of partial equipment in the molten salt reactor, and is safe, reliable and high in flexibility.)

1. A molten salt reactor fuel preparation and loading and unloading system is characterized by comprising a charging tank and a material preparation tank, and is connected with a reactor system; wherein the content of the first and second substances,

the operating liquid level limit of the reactor system is connected with a liquid level control pipeline;

the bottom of the reactor system is connected with one path of a fuel salt charging pipe, and the other end of the one path of the fuel salt charging pipe extends to the bottom of the charging tank;

the material preparing tank is a closed space, and a first air inlet pipe and a first exhaust pipe are arranged at the upper part of the material preparing tank; the upper part of the material preparing tank is also provided with at least one quantitative tank; a feeding control pipeline is arranged between the quantitative first tank and the material preparation tank, an inlet of the feeding control pipeline is arranged at the bottom of the material preparation tank, the feeding control pipeline penetrates through the tank body of the quantitative first tank, and an outlet of the feeding control pipeline is arranged at the upper part of the quantitative first tank; the quantitative first tank is a closed space, and a second air inlet pipe and a second air outlet pipe are arranged at the upper part of the quantitative first tank;

and the fuel salt charging pipe matched with the quantitative tank is communicated with the quantitative tank and the charging tank.

2. The molten salt reactor fuel preparation and handling system of claim 1, wherein the first dosing tank is further jacketed with at least two dosing tanks and a fuel salt charging pipe matching the two dosing tanks; the height of the tank opening of the quantitative second tank is lower than that of the quantitative first tank and higher than that of the outlet of the feeding control pipeline; the fuel salt charging pipe is communicated with the second quantitative tank and the charging tank in a three-way manner;

and/or the first air inlet pipe and the first exhaust pipe are respectively connected with an air source system and an exhaust system;

and/or the second air inlet pipe and the second exhaust pipe are respectively connected with an air source system and a tail gas system.

3. The molten salt reactor fuel preparation and handling system of claim 1, wherein the reactor system is further provided with a fuel salt discharge line; one end of the fuel salt discharging pipeline is connected with the bottom of the reactor system, and the other end of the fuel salt discharging pipeline is connected with a discharging tank;

and/or the reactor system comprises a third air inlet pipe and a third air outlet pipe;

and/or, the reactor system includes a pluggable structure.

4. The molten salt reactor fuel preparation and handling system of claim 3, wherein the third inlet pipe and the third exhaust pipe are connected to a gas source system and an exhaust system, respectively;

the pluggable structural member is arranged at the upper part of the reactor system;

the volume of the pluggable structural part is 1% -5% of the volume of the fuel salt in the reactor system;

the pluggable structural member is made of metal or graphite; the metal is preferably a hasn alloy, such as a nickel-chromium alloy or a nickel-chromium-molybdenum alloy;

the reactor system comprises a first inlet, a first outlet and a second outlet; the first inlet is used for being connected with one path of the fuel salt charging pipe; the first outlet is used for being connected with the liquid level control pipeline, and the second outlet is used for being connected with the fuel salt discharging pipeline.

5. The molten salt reactor fuel preparation and handling system of claim 4, wherein the level control piping is provided with a first isolation valve proximate the first outlet;

a third isolating valve is arranged at a position, close to the first inlet, of one way of the fuel salt charging pipe;

the discharging tank and the charging tank are integrated into a whole tank, the fuel salt discharging pipeline and the fuel salt charging pipe are integrated into a pipeline, and the charging tank is positioned below the reactor system; preferably, when the fuel salt discharge pipe and the fuel salt charging pipe are integrated into a single pipe, the first inlet and the second outlet are integrated into the same opening.

6. The molten salt reactor fuel preparation and handling system of claim 1, wherein the charging tank includes a third outlet for connection of the charging tank all the way to the fuel salt charging pipe;

and/or the charging tank further comprises a fourth air inlet pipe and a fourth air outlet pipe; preferably, the fourth air inlet pipe and the fourth exhaust pipe are respectively connected with an air source system and an exhaust system.

7. The molten salt reactor fuel preparation and handling system of claim 2, wherein each of the dosing tanks includes a fourth outlet for two-way connection with the fuel salt charging pipe; preferably, a fourth isolating valve is arranged on the two fuel salt charging pipelines close to the fourth outlet;

when at least one quantitative two-tank and a fuel salt charging pipe three-way matched with the quantitative two-tank are further sleeved in the quantitative one-tank, each quantitative two-tank comprises a fifth outlet which is used for being connected with the fuel salt charging pipe three-way;

and/or, the dosing tank comprises a thermocouple.

8. The molten salt reactor fuel preparation and handling system of claim 7, wherein a fifth isolation valve is provided in the fuel salt charging pipe at a location in the three paths near the fifth outlet;

the two fuel salt charging pipes and the three fuel salt charging pipes are converged into a first converging pipeline along the charging direction and then connected with a charging tank;

the third fuel salt charging pipe and the second fuel salt charging pipe are converged into a first converging pipeline along the charging direction, and then a sixth isolating valve is arranged;

the thermocouple is located at the upper part of the quantitative tank.

9. The molten salt reactor fuel preparation and handling system of claim 1, wherein the reactor system is connected to an overflow tank via the level control line.

10. The molten salt reactor fuel preparation and handling system of claim 9, wherein the overflow tank is further connected to the charge tank by a fuel salt mixing line;

and/or the overflow tank further comprises a fifth air inlet pipe and a fifth air outlet pipe; preferably, the fifth air inlet pipe and the fifth exhaust pipe are respectively connected with an air source system and an exhaust system;

and/or the overflow tank comprises a first opening for connection with the fuel salt mixing line; preferably, a second isolation valve is arranged at a position, close to the first opening, of the liquid level control pipeline;

and/or the fuel salt mixing pipeline and the liquid level control pipeline are connected with the overflow tank after being converged into a pipeline;

and/or after the fuel salt mixing pipeline and the fuel salt charging pipe are converged into a pipeline, the pipeline is connected with the charging tank;

and/or a seventh isolating valve and an eighth isolating valve are sequentially arranged on the fuel salt mixing pipeline; preferably, the seventh isolation valve and the eighth isolation valve are communicated with the sampler, and a ninth isolation valve is arranged at the sampler.

Technical Field

The invention relates to a molten salt reactor fuel preparation and loading and unloading system.

Background

The molten salt reactor is one of the advanced reactors of the fourth generation, and is the only reactor type using liquid fuel, so the molten salt reactor has unique advantages in the aspects of inherent safety, sustainable development of nuclear fuel, nuclear diffusion prevention and the like. Molten salt reactor fuels typically use fluoride salt mixtures (e.g., LiF-BeF)₂-ZrF₄-UF₄、LiF-BeF₂-UF₄-ThF₄、NaF-ZrF₄-UF₄Etc.) or chlorine salt mixtures (e.g. UCl)₄-UCl₃-NaCl、NaCl-UCl₃、NaCl-UCl₄Etc.), it is operated in a high temperature state. After the traditional component type nuclear fuel is manufactured in a special factory, the traditional component type nuclear fuel is directly transferred to a nuclear power plant for assembly, and after the operation is finished, an old fuel component is detached to be replaced by a new fuel component. The fuel of the molten salt reactor can be configured on site, and the carrier salt and the additive salt are mixed to prepare the fuel salt, namely the concentration of the fissile nuclide such as uranium-235 in the fuel salt can be flexibly adjusted in the operation process. Thus, the fuel handling system of the molten salt reactor establishes a closer relationship to the reactor design and operation. Due to the uniqueness of the fuel, the molten salt stacking and unloading system not only needs to have the function of loading and unloading the fuel, but also needs to have the function of preparing fuel salt (including the quantitative loading of the added salt and the mixing function of the added salt and the carrier salt), and the function of adjusting key nuclides such as uranium-235 in the fuel salt.

The molten salt reactor operating temperature can reach nearly a thousand degrees at most, but typically the start-up temperature is slightly above the melting point, about five hundred degrees. And the expansion coefficient of the molten salt is far larger than that of structural materials such as alloy, graphite and the like in the molten salt pile. That is, during operation, the volume of molten salt and the molten salt level in the reactor system or in the reactor vessel may fluctuate significantly, which puts certain demands on the reactor design, especially the integrated reactor design. Graphite is generally used as a structural material of the moderator and the molten salt flow channel in the molten salt thermal reactor. The graphite material may be partially separated out and float on the surface of molten salt during the installation process and the reactor operation process, and may cause certain damage to key equipment such as a molten salt pump.

In summary, the molten salt dump loading and unloading system at least has the following functions: the storage function of the added salt, the carrier salt and the fuel salt, the quantitative adding function of the added salt, the blending function of the fuel salt (namely the mixing function of the carrier salt and the added salt), the sampling function of the fuel salt, the injection function of the fuel salt and the discharge function of the fuel salt. In response to the above requirements, the molten salt loading and unloading system generally adopts different storage tanks to respectively store the added salt, the carrier salt and the fuel salt, and the mixing of the fuel salt is completed through the flowing and dumping of the carrier salt and/or the fuel salt among the storage tanks. In addition to this, the following problems have to be solved in particular:

1) critical safety issues are involved in the fuel dispensing process and the amount of added salt needs to be precisely controlled. Different quantities (from hundreds of kilograms to tens of kilograms, even kilograms) need to be added at different stages of reactor operation, and the problem is solved in the prior art by using a method of quantitative sub-packaging of small tanks or capsules. Since molten salt stacks are typically loaded with several tons of fuel salt, including several hundred kilograms of added salt, sub-packaging requires the preparation of a large number of canisters or capsules in advance.

2) Since the molten salt reactor system has a complicated structure and the expansion coefficients of molten salts of different compositions are different, there may be a large difference between the preparation amount of fuel salt (calculated value at the design stage) and the actual charge amount required for the reactor operation (operation charge amount for short). The fuel salt make-up may exceed 10% or more of the operating charge. This problem leads to high requirements on the charging operation during the fuel loading in the actual operating phase, both to achieve the charging required for operation and not to exceed the operating limits, or else to possible influences on the function of parts of the plant. An indication of the operating charge is usually given by a level gauge, and if the allowable range of the operating charge is small, higher demands are required on the level gauge and the charging operation, usually at the expense of a substantial increase in charging time by reducing the charging speed.

Therefore, a safe, reliable, simple, convenient and flexible fuel preparation and loading and unloading system of the molten salt reactor needs to be designed to ensure the safe operation of the molten salt reactor.

Disclosure of Invention

The invention aims to solve the problems that in the prior art, the fuel loading and unloading system of the molten salt reactor is complex in equipment and large in occupied area for realizing accurate control of salt addition; and the high requirements for a liquid level meter and charging operation in a reactor system are difficult to meet, and the molten salt reactor fuel preparation and loading and unloading system is provided. The molten salt reactor fuel loading and unloading system can realize accurate control of salt addition, can effectively control the liquid level of the fuel salt in the reactor system, and has the advantages of simple equipment, small occupied area, simple and convenient operation, safety, reliability and high flexibility.

The invention solves the technical problems through the following technical scheme.

The invention provides a molten salt reactor fuel preparation and loading and unloading system, which comprises a charging tank and a material preparation tank, and is connected with a reactor system; wherein the content of the first and second substances,

the operating liquid level limit of the reactor system is connected with a liquid level control pipeline;

the bottom of the reactor system is connected with one path of a fuel salt charging pipe, and the other end of the one path of the fuel salt charging pipe extends to the bottom of the charging tank and is used for charging the molten salt reactor fuel to the reactor system;

the material preparing tank is a closed space, and a first air inlet pipe and a first exhaust pipe are arranged at the upper part of the material preparing tank; the upper part of the material preparing tank is also provided with at least one quantitative tank; a feeding control pipeline is arranged between the quantitative first tank and the material preparation tank, an inlet of the feeding control pipeline is arranged at the bottom of the material preparation tank, the feeding control pipeline penetrates through the tank body of the quantitative first tank, and an outlet of the feeding control pipeline is arranged at the upper part of the quantitative first tank and used for controlling the feeding amount; the quantitative first tank is a closed space, and a second air inlet pipe and a second air outlet pipe are arranged at the upper part of the quantitative first tank; when in useIn order to realize charging, controlling a positive pressure difference between the standby tank and the quantitative tank (the positive pressure difference can be 0.005MPa-0.02MPa, or the value of the positive pressure difference can be more than rho gh₁And is less than rho gh₂Where ρ is the density of the fuel salt, g is the acceleration of gravity, h₁Is the length of the feeding control pipeline, h₂The height of the material preparation tank) and the fed material salt is conveyed to the quantitative tank from the material preparation tank along the feeding control pipeline under the action of gravity, and the quantitative tank is gradually filled with the material salt; then, controlling a negative pressure difference between the material preparation tank and the quantitative first tank, and enabling the liquid level of the quantitative first tank to be lowered to be flush with the outlet of the feeding control pipeline to realize the quantification of the material salt; and the fuel salt charging pipe matched with the quantitative first tank is communicated with the quantitative first tank and the charging tank in two ways and is used for transferring the quantitative material salt to the charging tank.

In the invention, as for at least one quantitative tank, the skilled person knows that the feeding amount can be controlled by controlling the volume of one quantitative tank; on the basis, the outlet height of the feeding control pipeline can be set for a single quantitative tank, and the flexible control of the feeding amount is further realized.

Preferably, at least one quantitative two-tank and a fuel salt charging pipe three-way matched with the quantitative two-tank are sleeved in the quantitative one-tank; the height of the tank opening of the quantitative second tank is lower than that of the quantitative first tank and higher than that of the outlet of the feeding control pipeline; the fuel salt charging pipe is communicated with the second quantitative tank and the charging tank in three ways and is used for transferring the quantitative material salt to the charging tank.

When a quantitative two-tank is arranged, in order to realize charging, a positive pressure difference (the positive pressure difference can be 0.005MPa-0.02MPa, or the value of the positive pressure difference can be more than rho gh) is controlled between the standby tank and the quantitative one-tank₁And is less than rho gh₂Where ρ is the density of the fuel salt, g is the acceleration of gravity, h₁Is the length of the feeding control pipeline, h₂Is the height of the stock preparation tank), the fed material salt is conveyed from the stock preparation tankThe material is conveyed into the quantitative first tank, the quantitative first tank is gradually filled with material salt and is immersed into the quantitative second tank, then a negative pressure difference is controlled between the material preparation tank and the quantitative first tank, the liquid level of the quantitative second tank is flush with the height of the tank opening of the quantitative second tank, and the liquid level of the quantitative first tank is lowered to be flush with the outlet of the feeding control pipeline; at least two portions of quantitative material salt are realized; further realizing the flexible control of the feeding amount.

When the quantitative salt in the quantitative first tank or the quantitative second tank is fed into the charging tank, the quantitative first tank or the quantitative second tank is controlled to have a positive pressure difference (the positive pressure difference can be 0.005MPa-0.1 MPa; or the positive pressure difference can be larger than rho gh) with the charging tank₃Where ρ is the density of the fuel salt, g is the acceleration of gravity, h₃The height difference between the highest point of the two paths of the fuel salt charging pipe and the bottom of the quantitative tank, or h₃The height difference between the highest point of the three ways of the fuel salt charging pipe and the bottom of the quantitative two tanks), the material salt of the quantitative one tank or the quantitative two tanks is conveyed to the charging tank through the two ways of the fuel salt charging pipe or the three ways of the fuel salt charging pipe, and in the conveying process, if the sudden pressure drop of the quantitative one tank or the quantitative two tanks is monitored, the material salt conveying is finished. When the quantitative material conveying device is used, if the materials in the quantitative first tank and the quantitative second tank need to be fed into the charging tank, the materials in the quantitative first tank or the quantitative second tank are conveyed step by step.

In the present invention, the reactor system is a reactor system conventionally known in the art, and the inside thereof may be used to perform a nuclear reaction of the molten salt reactor fuel.

Wherein, preferably, the reactor system is also provided with a fuel salt discharge pipeline; one end of the fuel salt discharging pipeline is connected with the bottom of the reactor system, and the other end of the fuel salt discharging pipeline is connected with a discharging tank; more preferably, the discharging tank and the charging tank can be integrated into a whole tank for realizing the functions of charging and discharging simultaneously; specifically, the two functions can be switched according to the actual use condition, and meanwhile, the fuel salt discharging pipeline and the fuel salt charging pipeline are preferably integrated into a pipeline.

Wherein the reactor system generally comprises a first inlet, a first outlet, and a second outlet; the first inlet is used for being connected with one path of the fuel salt charging pipe; the first outlet is used for being connected with the liquid level control pipeline, and the second outlet is used for being connected with the fuel salt discharging pipeline. Preferably, when the fuel salt discharge pipe and the fuel salt charging pipe are integrated into a single pipe, the first inlet and the second outlet are integrated into the same opening. When the fuel salt in the reactor system exceeds the operation limit value, the fuel salt flows out of the reactor system through the liquid level control pipeline. The operating liquid level limit is the operating limit of fuel salt in the reactor system, and exceeding the operating liquid level limit affects part of equipment functions (different molten salt reactor designs can be different; for example, the corrosion resistance of a reactor core pressing plate selected in the integrated reactor design is poor, and if the liquid level of the fuel salt exceeds the operating limit, the service life of the reactor core pressing plate can be affected). According to the invention, a high-precision reactor liquid level meter is not required in the reactor system, the feeding operation is simple, the equipment cost is low, and the safety and the reliability are realized. When the reactor system is charged, the charging progress can be known by monitoring the temperature of the liquid level control pipeline. Through the liquid level control pipeline, still can collect float in the reactor system at the graphite piece on liquid level surface layer, usable filter layer carries out automatic filtration afterwards, reduces the harm risk to key equipment such as molten salt pump.

The reactor system generally further includes a third gas inlet pipe and a third gas outlet pipe for regulating the atmosphere and the gas pressure of the reactor system. Preferably, the third air inlet pipe and the third air outlet pipe are respectively connected with an air source system and an exhaust system.

Preferably, the reactor system includes a pluggable structure. The pluggable structure may be located in a reactor system in areas where reactivity is of lower value, such as an upper portion of the reactor system. The pluggable structural member is matched with the liquid level control pipeline to jointly adjust the liquid level in the reactor system.

Preferably, the size and shape of the pluggable structural member can be designed according to different reactor systems, and the volume of the pluggable structural member can be 1% -5% of the volume of the fuel salt in the reactor system.

Preferably, the pluggable structural member is made of metal or graphite. The metal is preferably a hasn alloy, such as a nickel-chromium alloy or a nickel-chromium-molybdenum alloy, having good corrosion resistance and thermal stability.

In the present invention, the charging tank is a charging tank which is conventionally known in the art, and is used for charging the reactor system and also for discharging the reactor system.

Wherein, preferably, when the charging tank and the discharging tank are integrated into a single tank, the charging tank is located below the reactor system. Therefore, the discharging process of the reactor system is carried out by gravity, and the reactor system belongs to a passive safe shutdown system, and can achieve the effect of long-term safe shutdown. When unloading, if including the pluggable structure spare in the reactor system, can with but the pluggable structure spare is whole to be inserted in the reactor system for unload can pass through simultaneously the liquid level control pipeline and the fuel salt pipeline of unloading are unloaded, accomplish with higher speed the discharge of molten salt reactor fuel and reactor shut down.

Wherein said charging tank typically includes a third outlet for connection of said charging tank all the way to said fuel salt charging line.

Wherein the charging tank is generally loaded with carrier salt matched with the fuel salt when the fuel salt is loaded, and the carrier salt can be loaded by two ways of a fuel salt charging pipe or other ways which can be loaded into the charging tank by a person skilled in the art.

Wherein the charging tank generally further comprises a fourth gas inlet pipe and a fourth gas outlet pipe for regulating the atmosphere and the gas pressure state of the charging tank. Preferably, the fourth air inlet pipe and the fourth air outlet pipe are respectively connected with an air source system andand connecting an exhaust system. When the material salt in the charging tank needs to be charged into the reactor system, controlling the charging tank and the reactor system to have positive pressure difference (the positive pressure difference can be 0.02MPa-0.2MPa, or the value of the positive pressure difference can be more than rho gh₄Where ρ is the density of the fuel salt, g is the acceleration of gravity, h₄Which refers to the height difference between the level of the fuel salt in the reactor system and the bottom of the charging tank), the charged salt is transported from the charging tank into the reactor system along the fuel salt charging pipe all the way against the action of gravity.

In the invention, the material preparing tank is a material preparing tank which is conventional in the field. Through in the material preparation jar integration a ration jar realizes following function simultaneously: the storage of a large amount of added salt is completed, and a multi-stage automatic quantitative function can be performed in the charging process of the added salt, so that the complexity of the system is reduced, and the flexibility and the reliability of the system are improved.

Wherein, the preparation tank is generally prepared when the fuel salt is loaded, and the skilled person knows that the preparation of the fuel salt can be supplemented by any pipeline communicated with the preparation tank.

Wherein each of said dosing tanks generally includes a fourth outlet for two-way connection to said fuel salt charging line.

When at least one quantitative two-tank and a fuel salt charging pipe which is matched with the quantitative two-tank are further sleeved in the quantitative one-tank, each quantitative two-tank generally comprises a fifth outlet which is used for being connected with the fuel salt charging pipe in a three-way mode.

Preferably, the two paths of the fuel salt charging pipe and the three paths of the fuel salt charging pipe are converged into a first converging pipeline along the charging direction, and then are connected with the charging tank.

Preferably, the dosing tank comprises a thermocouple. The thermocouple is preferably located in the upper portion of the dosing tank. When there is positive pressure differential between the preparation tank and the quantitative tank, the liquid level in the quantitative tank can continuously rise, the upper temperature of the quantitative tank rises along with the liquid level, and the thermocouple positioned at the upper part of the quantitative tank can be used for judging whether the material in the quantitative tank is filled.

In the invention, the first air inlet pipe and the first exhaust pipe are generally respectively connected with an air source system and an exhaust system.

In the invention, the second air inlet pipe and the second exhaust pipe are generally respectively connected with an air source system and a tail gas system.

In a preferred embodiment of the present invention, a first isolation valve is disposed on the liquid level control pipeline at a position close to the first outlet.

In a preferred embodiment of the invention, a third isolation valve is provided in the fuel salt charging line all the way to the first inlet.

In a preferred embodiment of the present invention, a fourth isolation valve is disposed in the two fuel salt charging pipes near the fourth outlet.

On the basis, when at least one quantitative two-tank and a matched three-way fuel salt charging pipe are further sleeved in the quantitative one-tank, a fifth isolating valve is arranged in the three-way fuel salt charging pipe at a position close to the fifth outlet; preferably, after the three fuel salt charging pipes and the two fuel salt charging pipes are converged into a first converging pipeline along the charging direction, a sixth isolating valve is further arranged.

In the present invention, preferably, the reactor system is connected to an overflow tank through the liquid level control pipeline. Preferably, the overflow tank is also connected with the charging tank through a fuel salt mixing pipeline for conveying the molten salt reactor fuel to and from the overflow tank and the charging tank. One skilled in the art knows that the fuel salt mixing line is open at one end in the overflow tank at the bottom of the overflow tank; an opening is located at the bottom of the charging tank at one end of the charging tank.

Preferably, the overflow tank includes a first opening for connection to the fuel salt mixing line.

Preferably, the fuel salt mixing pipeline and the liquid level control pipeline are connected with the overflow tank after being converged into a pipeline.

Preferably, the fuel salt mixing pipeline and the fuel salt charging pipe are converged into a pipeline and then connected with the charging tank.

In a preferred embodiment of the present invention, a second isolation valve is disposed on the liquid level control pipeline at a position close to the first opening.

In a preferred embodiment of the present invention, a seventh isolation valve and an eighth isolation valve are sequentially disposed on the fuel salt mixing pipeline. Preferably, the seventh isolating valve and the eighth isolating valve are communicated with the sampler, and a ninth isolating valve is arranged at the sampler.

The overflow tank generally further includes a fifth intake pipe and a fifth exhaust pipe for regulating the atmosphere and the pressure of the overflow tank. When salt is added into the charging tank and needs to be fully mixed with fuel salt to obtain molten salt reactor fuel, the material salt is conveyed back and forth in the overflow tank and the charging tank through the fuel salt mixing pipeline by controlling the air pressure difference between the overflow tank and the charging tank, and the uniform mixing preparation of the molten salt reactor fuel is realized.

Preferably, the fifth air inlet pipe and the fifth exhaust pipe are respectively connected with an air source system and an exhaust system.

In the present invention, "salt addition" generally refers to UF₄、ThF₄、UCl₃Or UCl₄And the like; "Carrier salt" refers generally to LiF and BeF₂Mixture of (1), NaF, ZrF₄Or a molten salt such as NaCl.

In the invention, the isolation valve is used in each molten salt pipeline to isolate the fuel of the molten salt reactor. The first isolation valve is used for controlling the operation of the liquid level control pipeline. The second isolation valve, the seventh isolation valve and the eighth isolation valve are used for controlling the delivery of the molten salt reactor fuel to and from the overflow tank and the charging tank. The third isolation valve is used for controlling the delivery of the molten salt reactor fuel to and from the reactor system and the charging tank. The fourth, fifth, sixth isolation valves are used to control the delivery of the molten salt stack fuel in the dosing one or two tanks to the charge tank. In addition, the second isolation valve, the seventh isolation valve and the ninth isolation valve are opened simultaneously to detect the material in the overflow tank; the eighth isolation valve and the ninth isolation valve are opened simultaneously to detect the material in the charging tank; the first, seventh and ninth isolation valves are opened simultaneously to detect material in the reactor system (the pluggable structure may be inserted into the reactor system).

In the invention, the air inlet pipe is connected with an air source system. The exhaust pipe is connected with an exhaust system. The ports of the air inlet pipe and the exhaust pipe are provided with air path regulating valves; the air inlet amount and the air outlet amount are controlled by an air path adjusting valve.

The intake air and the exhaust gas can be provided with flow regulation and pressure measurement instruments. Each molten salt pipeline can be provided with a temperature measuring instrument.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The reagents and starting materials used in the present invention are commercially available.

The positive progress effects of the invention are as follows:

(1) the reactor system is provided with a liquid level control pipeline, a material preparation tank in the molten salt reactor fuel loading and unloading system is connected with a quantitative first tank through a feeding control pipeline, and a quantitative second tank is matched if necessary, so that the multistage quantitative function of salt addition in the storage and feeding processes of a large amount of added salt can be completed. The invention can realize the accurate control of salt addition, can effectively control the liquid level of the fuel salt in the reactor system, has simple equipment and small occupied area, simplifies the feeding operation of the molten salt reactor, reduces the measurement precision requirement of partial equipment in the molten salt reactor, is safe and reliable, and has high flexibility.

(2) When the liquid level control pipeline is connected with the overflow tank, part of molten salt can be automatically discharged when the temperature in the liquid level control pipeline rises. Under the accident condition, the overflow tank and the charging tank can be jointly used as a reactor shutdown means, and the effect of long-term safe reactor shutdown can be achieved.

(3) The liquid level control pipeline can also be matched with a pluggable structural member in the reactor to adjust the amount of molten salt in the reactor; graphite residues floating on the surface layer of the molten salt can be automatically discharged, and the risk of damage to key equipment such as a molten salt pump is reduced.

(4) The sampling device can be arranged in the molten salt pipeline, and the sampling device does not need to be arranged in the reactor and the storage tank.

Drawings

Fig. 1 is a schematic view of an apparatus and molten salt of a molten salt reactor fuel handling system in example 1.

FIG. 2 is a schematic diagram of an apparatus and gas paths of a molten salt reactor fuel handling system in example 1.

Description of the reference numerals

Reactor system 100

Liquid level control pipeline 101

One way 102 of fuel salt charging pipe

The first inlet 103

First outlet 104

Third intake pipe 105

Third exhaust pipe 106

Pluggable structure 107

First isolation valve 108

Third isolation valve 109

Charging tank 200

Third outlet 201

Fourth intake pipe 202

Fourth exhaust pipe 203

Material preparing tank 300

First intake pipe 301

First exhaust pipe 302

Quantitative one-pot 303

Feed control line 304

Second intake pipe 305

A second exhaust pipe 306

Two way fuel salt charging pipe 307

Quantitative two-tank 308

Fuel salt charging pipe three way 309

Sixth isolation valve 310

Fourth outlet 311

Fifth outlet 312

First collecting pipe 313

Thermocouple 314

Fourth isolation valve 315

Fifth isolation valve 316

Overflow tank 400

First opening 401

Second isolation valve 402

Seventh isolation valve 403

Eighth isolation valve 404

Ninth isolation valve 405

Fifth intake pipe 406

Fifth exhaust pipe 407

Fuel salt mixing line 408

Sampler 500

Air supply system 601

Exhaust system 602

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.