CN117438112A

CN117438112A - Pool type fast reactor main container simulation device

Info

Publication number: CN117438112A
Application number: CN202210814137.5A
Authority: CN
Inventors: 刘光耀; 冯预恒; 周志伟; 杨红义
Original assignee: China Institute of Atomic of Energy
Current assignee: China Institute of Atomic of Energy
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2024-01-23

Abstract

The invention relates to a pool type fast reactor main container simulation device, which comprises a main container simulation component, a data acquisition system, a ventilation system, a sodium supply system, a heating system and an inert gas supply system, wherein the main container simulation component is connected with the data acquisition system; wherein the main container simulation component comprises a top cover and a shell, the ventilation system is used for providing cooling air for the main container simulation component, the sodium supply system is used for providing and recovering liquid sodium for the main container simulation component, the heating system is used for heating the liquid sodium, and the inert gas supply system is used for providing inert gas for the main container simulation component. According to the pool type fast reactor main container simulation device, temperature distribution of the upper space of the pool type sodium-cooled fast reactor main container under different working conditions can be obtained, so that heat transfer characteristics of a complex space at the top of a reactor can be studied.

Description

Pool type fast reactor main container simulation device

Technical Field

The invention relates to a pool type sodium-cooled fast reactor, in particular to a simulation device for acquiring the temperature of a main container of the pool type fast reactor.

Background

The primary vessel of the fast reactor acts as a nuclear safety primary device, and the structural integrity of the primary vessel is critical to the safety of the reactor. In the process of evaluating the strength of the main container of the fast reactor, the temperature load of the upper part of the main container needs to be obtained.

However, the geometry and heat transfer characteristics of the top region of the main vessel are very complex. On the one hand, the top area of the main vessel is located above the sodium level of the reactor, and this partial area contains not only large-sized argon gas space, in-reactor heat shields, large, medium and small rotating shield plugs, main pumps, heat exchangers, etc., but also many small-sized narrow air gaps. On the other hand, in the heat transfer mode, the radiation heat transfer from the sodium liquid surface to the in-pile heat shield and from the in-pile heat shield to the inner wall of the inclined shoulder of the cone top cover is realized, and the convection heat transfer from the argon gas to the sodium liquid surface, the heat shield, the rotary shielding plug and the inner wall of the metal layer is realized; in addition, there is a heat conduction phenomenon. The heat transfer rates of the three heat transfer modes are different in different areas, so that the heat transfer characteristics of the top of the pool type sodium-cooled fast reactor main container are extremely complex.

At present, the research on the pool type fast reactor at home and abroad is basically realized through numerical simulation. In practice, in the process of numerical simulation, from the establishment of a geometric model and the selection of a heat transfer calculation model, to the setting of boundary conditions and to the actual heat transfer process, a great deal of simplification and error transfer exist, so that more accurate temperature values are difficult to obtain.

Disclosure of Invention

Based on the description of the prior art, to obtain a relatively accurate temperature value, a correlation test can be performed, but the cost of the 1:1 size replication prototype stack is too high.

In view of the above analysis, an embodiment of the present invention is to provide a pool type fast reactor main vessel simulation device for solving the problem of poor accuracy of numerical simulation temperature of the pool type fast reactor main vessel in the prior art.

One embodiment of the present invention provides a pool type fast reactor main vessel simulation device, comprising:

a main vessel simulation component comprising a top cover and a housing;

a data acquisition system;

a ventilation system for providing cooling air to the main vessel simulation component;

a sodium supply system for providing and recovering liquid sodium to the main vessel simulation component;

the heating system is used for heating the liquid sodium; and

an inert gas supply system for supplying an inert gas to the main vessel simulation member;

wherein, a plurality of penetrating simulation components penetrating through the top cover are arranged on the top cover, and the penetrating simulation components comprise a main pump; the data acquisition system is used for measuring and collecting the temperature of the inner surface and the outer surface of the top cover, the temperature of the inner surface and the outer surface of the main pump and the gas temperature inside the main container simulation component.

According to one embodiment of the invention, the top cover is a round table-shaped cylinder and comprises a first opening, a second opening and a side surface positioned between the first opening and the second opening; a shielding plug is arranged on the first opening, and the plurality of penetrating simulation components are arranged on the side face.

According to one embodiment of the invention, the data acquisition system comprises a plurality of first temperature measuring components, wherein the plurality of first temperature measuring components are arranged on the top cover and are used for measuring the temperature of the outer surface of the top cover.

According to an embodiment of the present invention, the plurality of first temperature measuring parts includes a plurality of sets of radial first temperature measuring parts and a plurality of sets of circumferential first temperature measuring parts; each group of radial first temperature measuring components are arranged along a generatrix of the circular table, and each group of circumferential first temperature measuring components are arranged along a coaxial circle of the first opening.

According to an embodiment of the present invention, the plurality of first temperature measuring parts further includes a plurality of other first temperature measuring parts, at least a part of which are arranged around the plurality of through simulation parts.

According to an embodiment of the invention, the data acquisition system comprises at least one second temperature measuring component for obtaining the temperature of the inner surface of the top cover.

According to one embodiment of the invention, the second temperature measuring component is embedded in the cover body of the top cover and is positioned between the inner surface and the outer surface of the cover body.

According to an embodiment of the invention, the data acquisition system comprises at least one third temperature measuring component for measuring the temperature of the gas inside the main vessel simulation component.

According to an embodiment of the present invention, the plurality of through simulation components includes a main pump, and the data acquisition system includes a plurality of fourth temperature measurement components for measuring a temperature of the main pump.

According to one embodiment of the present invention, the main pump is a cylinder, and the plurality of fourth temperature measuring components include a plurality of sets of surface fourth temperature measuring components and a plurality of embedded fourth temperature measuring components, wherein the surface fourth temperature measuring components are used for measuring the temperature of the inner surface of the main pump, and the embedded fourth temperature measuring components are embedded in the housing of the main pump and are used for measuring the temperature inside the housing of the main pump.

According to the pool type fast reactor main container simulation device, temperature distribution of the upper space of the pool type sodium-cooled fast reactor main container under different working conditions can be obtained, so that heat transfer characteristics of a complex space at the top of a reactor can be studied.

In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention. Wherein:

FIG. 1 is a schematic diagram of the distribution of components of a pool type fast reactor main vessel simulation apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a main vessel according to an embodiment of the present invention;

FIG. 3 is a top view of a primary container according to one embodiment of the present invention;

FIG. 4 is a schematic structural view of a third temperature measurement component according to an embodiment of the present invention disposed on a bracket;

FIG. 5 is a schematic diagram of a fourth temperature measuring device according to an embodiment of the present invention.

The reference numerals are explained as follows:

100. a main vessel simulation component; 110. a top cover; 111. a heat preservation layer; 112. a ventilation system connection; 120. a housing; 121. liquid sodium; 122. a shielding plug protective sleeve; 123. a shield column simulator; 124. a radial heat shield simulator in the stack; 131. a shield plug; 132. a main pump; 133. an intermediate heat exchanger; 134. an independent heat exchanger; 135. a boss; 200. a ventilation system; 210. a blower; 220. a preheater; 300. a sodium supply system; 310. a sodium storage tank; 320. a liquid sodium purifier; 330. a sodium discharge tank; 340. an electromagnetic pump; 400. a heating system; 410. an electric heater; 411. an electric heating rod; 420. an electric heater power supply; 500. an inert gas supply system; 510. a liquid argon tank; 520. a vaporizer; 530. a voltage stabilizer; 540. an argon buffer tank; 551. a first argon line; 552. a second argon line; 553. a third argon line; 554. a fourth argon line; 555 fifth argon line; 560. a first compressor; 570. a second compressor; 580. a vacuum pump; 611. a radial first temperature measurement component; 612. a circumferential first temperature measurement member; 613. other first temperature measuring components; 630. a third temperature measurement component; 631. a heat shielding cover; 632. a bracket; 641. a fourth temperature measuring part on the surface; 642. a fourth temperature measuring component is embedded; 643. a lead wire; 901. a first regulating valve; 902. a second regulating valve; 903. a third regulating valve; 904. a fourth regulating valve; 905. a fifth regulating valve; 906. a sixth regulating valve; 907. a seventh regulating valve; 908. an eighth regulating valve; 909. a ninth regulator valve; 910. a tenth regulating valve; 911. an eleventh regulating valve; 912. a twelfth regulating valve.

Detailed Description

The following detailed description of preferred embodiments of the invention, which form a part hereof, and together with the description of the invention serve to explain the principles of the invention, are not intended to limit the scope of the invention.

The invention provides a simulation device for researching the heat transfer characteristic of the upper part of a main container of a pool type sodium-cooled fast reactor, which is used for geometrically shrinking the upper space of the main container based on a similar principle, so that the temperature distribution of the upper space of the main container under different working conditions can be obtained to research the heat transfer characteristic of a complex space at the top of the reactor.

Referring to fig. 1, an embodiment of the present invention provides a pool type sodium-cooled fast reactor main vessel simulation apparatus including a main vessel simulation part 100, a ventilation system 200, a sodium supply system 300, a heating system 400, an inert gas supply system 500, and a data collection system. Wherein the ventilation system 200 is used for providing cooling air to the main vessel simulation member 100, the sodium supply system 300 is used for providing and recovering liquid sodium to the main vessel simulation member 100, the heating system 400 is used for simulating a core heat source of a reactor and heating the liquid sodium in the main vessel simulation member 100, the inert gas supply system 500 is used for providing inert gas to the main vessel simulation member 100, and the data acquisition system is used for measuring and collecting temperature information of the main vessel simulation member 100.

The main vessel simulation component 100 of an embodiment of the present invention is used to simulate the main vessel of a reactor to maximize the reduction of the heat transfer characteristics of the reactor main vessel, particularly the top. Wherein each of the components provided inside and outside the main vessel simulation unit 100 is for making the temperature thereof approach the temperature of the reactor main vessel under the same conditions.

According to the pool type fast reactor main container simulation device of the embodiment of the invention, the liquid sodium of the main container simulation component 100 is heated to a certain temperature by the heating system 400 so as to simulate various working conditions of different prototype reactor sodium temperatures; meanwhile, the ventilation system 200 and the inert gas supply system 500 are used for simulating an argon gas space and a ventilation cooling device of the prototype stack, so that the inside of the stack is closer to the actual working condition. On the basis, the data acquisition system is used for collecting the temperature of each measuring point of the main container simulation component 100, and then the temperature distribution of the prototype pile under different working conditions is provided with a test basis through post-treatment.

In one embodiment, the main container simulation component 100 includes a top cover 110 and a housing 120, where the top cover 110 is disposed on the housing 120, and the housing 120 may be a cylindrical barrel. Referring to fig. 2 and 3, the top cover 110 may be a circular truncated cone-shaped cylinder, and includes a circular first opening, a circular second opening, and a side surface between the first opening and the second opening, wherein the diameter of the first opening is smaller than that of the second opening, and the top cover 110 is connected to the housing 120 through the second opening.

In an embodiment, a shielding plug 131 is disposed on the first opening of the top cover 110 to close the first opening and also to shield heat, and the shielding plug 131 may be a cylindrical structure, and further may be a rotary shielding plug.

In one embodiment, the main container simulation member 100 is provided with a plurality of penetrating simulation members, and the plurality of penetrating simulation members penetrate the top cover 110, and part of the penetrating simulation members are located outside the main container simulation member 100 and part of the penetrating simulation members are located inside the main container simulation member 100.

In one embodiment, referring to fig. 2 and 3, the plurality of through simulation components includes a main pump 132, an intermediate heat exchanger 133, and an independent heat exchanger 134; further, the number of the main pumps 132 may be two, the number of the intermediate heat exchangers 133 may be four, and the number of the independent heat exchangers 134 may be four.

In an embodiment, the plurality of penetrating simulation members penetrate the top cover 110 through the side surface of the truncated cone-shaped top cover 110, that is, the plurality of through holes are formed in the side surface of the truncated cone-shaped cylinder, and the plurality of penetrating simulation members are penetratingly arranged on the top cover 110 through the through holes.

In one embodiment, referring to fig. 3, a plurality of penetration simulation members may be circumferentially arranged along a region adjacent to the second opening of the top cover 110.

In one embodiment, to save material and simplify construction, a plurality of through-simulation members may be configured as cylinders in shape, but with thermal conductivity approaching that of the corresponding members. For example, the main pump 132 may be a cylinder with the same thermal conductivity as the actual main pump assembly. Likewise, other through-simulation components, such as intermediate heat exchanger 133 and independent heat exchanger 134, may also be cylindrical in configuration.

In one embodiment, a boss 135 is further disposed on a side of the top cover 110, where the boss 135 is a dummy part of a prototype reactor carrying loader-unloader, and the boss 135 may be a cylinder with an oval cross section.

Referring to fig. 2, in an embodiment, an insulation layer 111 is disposed on an outer surface of the top cover 110, the shape of the insulation layer 111 may be the same as that of the top cover 110, and the insulation layer 111 may be made of aluminum silicate.

In one embodiment, referring to fig. 2, a plurality of ventilation system connection parts 112 are further provided on the top cover 110 to be connected with the ventilation system 200. The ventilation system connection 112 is a cylinder with a cavity, such as a circular cylinder, which is sealed with an opening and is closed at the other end, and a ventilation opening is provided on a sidewall to connect with the ventilation system 200. The ventilation system connection 112 may be provided on a plurality of structures located outside the top cover 110 through the analog components. Further, the ventilation system connection part 112 may be sleeved outside the through simulation member, and the opening end of the ventilation system connection part is downward, that is, the through simulation member is located in the cavity of the ventilation system connection part 112. Thus, the cooling gas from the ventilation system 200 can cool the penetrating dummy member in the cavity of the ventilation system connection part 112, and at the same time, the cooling gas can flow out from the lower end opening of the ventilation system connection part 112 to cool the side surface of the truncated cone-shaped top cover 110.

In one embodiment, the housing 120 may be a cylindrical barrel, and the bottom of the barrel may be used as a liquid sodium pool for containing liquid sodium 121; further, the material of the housing 120 may be stainless steel.

In one embodiment, one end of the shielding plug 131 extends out of the main container simulation component 100 through the top cover 110, and the other end is suspended in the main container simulation component 100 and is positioned above the liquid sodium pool; further, the axis of the shield plug 131 is on the same line as the axis of the main tank simulation member 100.

In an embodiment, the shielding plug protecting sleeve 122 is disposed outside the shielding plug 131, the shielding plug protecting sleeve 122 is a cylinder, the shape of the internal cavity of the shielding plug protecting sleeve 122 can be the same as that of the shielding plug 131, and the shielding plug protecting sleeve 122 can be made of 304 stainless steel or 316 stainless steel.

In one embodiment, one end of the plurality of through simulation members extends out of the main container simulation member 100 through the top cover 110, and the other end is located at the bottom of the main container simulation member 100, i.e., in the liquid sodium pond.

In one embodiment, a shielding column simulator 123 is disposed inside the main container simulation member 100, and the shielding column simulator 123 has a stainless steel cylindrical structure, and an opening is disposed at the bottom thereof to allow liquid sodium to circulate. The shield column simulator 123 simulator is disposed at the bottom of the main vessel simulator 100, i.e., in the liquid sodium pool.

In one embodiment, an in-stack radial heat shield simulator 124 is provided inside the main vessel simulation member 100. The in-stack radial heat shield simulator 124 is a cylindrical structure having a shape similar to the main vessel simulator 100, and is composed of a truncated cone-shaped cylindrical body and a cylindrical body, which is open at both ends; the in-stack radial heat shield simulation 124 is slightly smaller in size than the main vessel simulation member 100 such that a plurality of through simulation members and other members located within the main vessel simulation member 100 are located within the in-stack radial heat shield simulation 124.

In one embodiment, the ventilation system 200 is disposed outside the main vessel simulation member 100 and is connectable to the ventilation system connection 112 for providing ventilation cooling to the sides of the frustoconical roof 110 and the plurality of portions of the simulation member located outside the roof 110.

In one embodiment, referring to fig. 1, the ventilation system 200 includes a fan 210, a preheater 220, and a flow distribution pipeline, wherein the fan 210 is connected to the preheater 220, the fan 210 may be an axial flow fan, and the preheater 220 may be an air preheater. The ventilation system 200 is connected to the main tank simulation member 100 through a flow distribution line, and a first regulator valve 901 is provided in the line connecting the ventilation system 200 to the main tank simulation member 100.

In one embodiment, the sodium feed system 300 includes a sodium storage tank 310, a liquid sodium purifier 320, a sodium displacement tank 330, a solenoid pump 340, and a preheater. Wherein the sodium storage tank 310 is used for providing liquid sodium to the main vessel simulation member 100, and the sodium discharge tank 330 is used for collecting liquid sodium discharged from the main vessel simulation member 100. The sodium storage tank 310 is connected with the main container simulation component 100 through a first pipeline and a second pipeline respectively, the liquid sodium purifier 320 is arranged on the first pipeline, and a second regulating valve 902 can be arranged between the sodium storage tank 310 and the liquid sodium purifier 320; a third regulator valve 903 and a solenoid pump 340 are provided in the second line, and a fourth regulator valve 904 and a sodium discharge tank 330 are connected to the line between the third regulator valve 903 and the solenoid pump 340.

In one embodiment, the heating system 400 is used to simulate the core heat source and heat the liquid sodium in the main vessel simulation component 100; the heating system 400 may be an electrical heating system, and may include, for example, an electric heater 410, an electric heater power supply 420, and a power control cabinet.

In one embodiment, the heating system 400 may be disposed at the bottom of the main vessel simulation member 100 opposite the top cover 110.

In one embodiment, referring to fig. 2, the electric heater 410 includes an electric heating rod 411, and the electric heating rod 411 is disposed at the bottom of the housing 120 below the liquid sodium pool; in one aspect, the electrical heater rod 411 may be used to heat liquid sodium in a liquid sodium pool during a test, simulating a reactor core as a heat source for the test apparatus; on the other hand, the device can be used as a heating device, and can be used as a preheater for maintaining the device at a required temperature (for example, 170 ℃ to 190 ℃) in operations such as filling and discharging liquid sodium, argon replacement and the like.

In one embodiment, the electrical heater rod 411 may be powered by an ac power source.

In one embodiment, the inert gas supply system 500 is responsible for providing argon purge and argon for the main vessel simulation assembly 100 to simulate the argon space of a prototype stack. The inert gas supply system 500 may include a liquid argon tank 510, a fifth regulator valve 905, a vaporizer 520, a sixth regulator valve 906, a regulator 530, an argon buffer tank 540, and a plurality of argon lines for argon circulation, which are connected in this order.

In one embodiment, the plurality of argon lines includes a first argon line 551, a second argon line 552, a third argon line 553, a fourth argon line 554, and a fifth argon line 555. One end of the first argon pipeline 551 is connected to the argon buffer tank 540, the other end is connected to the second argon pipeline 552 and the third argon pipeline 553, and a seventh regulating valve 907 and an eighth regulating valve 908 are provided on the first argon pipeline 551. The second argon gas line 552 is connected to the main tank simulation member 100 to supply argon gas into the main tank simulation member 100, and a ninth regulator valve 909 and a first compressor 560 are provided in the second argon gas line 552. The third argon gas line 553 is connected to the sodium storage tank 310 of the sodium supply system 300, and a tenth regulator valve 910 and a second compressor 570 are provided in the third argon gas line 553.

One end of the fourth argon line 554 is connected to the first line of the sodium feed system 300, and further connected to a portion of the first line between the liquid sodium purifier 320 and the second regulator valve 902; the other end of the fourth argon line 554 is connected to a vacuum pump 580; an eleventh regulator valve 911 is also provided on the fourth argon line 554. The fifth argon gas pipeline 555 is connected with the first argon gas pipeline 551 and the fourth argon gas pipeline 554 respectively, further, the connection position of the fifth argon gas pipeline 555 and the fourth argon gas pipeline 554 is located between the eleventh regulating valve 911 and the vacuum pump 580, the connection position of the fifth argon gas pipeline 555 and the first argon gas pipeline 551 is located between the seventh regulating valve 907 and the eighth regulating valve 908, and the twelfth regulating valve 912 is further arranged on the fifth argon gas pipeline 555.

In the inert gas supply system 500 according to an embodiment of the present invention, during operation, different valves are opened according to different requirements, and argon gas enters the first argon gas pipeline 551 from the liquid argon tank 510 through the argon buffer tank 540, and then enters the main container simulation component 100 through the second argon gas pipeline 552, and in addition, during sodium supply and discharge, argon can be supplied through the following pipelines to change the air pressure in the sodium supply system: enters the sodium feed system 300 through a third argon line 553 and is circulated between the sodium feed system 300 and the main vessel simulation component 100 through the first and second lines of the sodium feed system 300; argon in the sodium supply system 300 is exhausted from the simulator system through a fourth argon line 554 under the action of a vacuum pump 580; on the other hand, the argon in the fourth argon line 554 can also reenter the first argon line 551 through the fifth argon line 555 for recycling.

In one embodiment, the data acquisition system is used to obtain the temperature of the inner and outer surfaces of the top cover 110, the temperature of the inner and outer surfaces of the main pump 132, and the temperature of the gas inside the main vessel simulation assembly 100.

In one embodiment, the data acquisition system includes a plurality of temperature measurement components, a plurality of pressure gauges, a plurality of flow meters, and a plurality of data transmission lines.

In one embodiment, a plurality of temperature measuring points are selected on the main vessel simulation unit 100, and one temperature measuring unit is provided on each temperature measuring point to measure the temperature of the corresponding location.

In one embodiment, the data acquisition system includes a plurality of first temperature measuring components disposed on the top cover 110 for measuring the temperature of the outer surface of the top cover 110.

As shown in fig. 3, in an embodiment, the plurality of first temperature measuring components includes a plurality of sets of radial first temperature measuring components 611, a plurality of sets of circumferential first temperature measuring components 612, and a plurality of other first temperature measuring components 613, where the radial first temperature measuring components 611, the circumferential first temperature measuring components 612, and the other first temperature measuring components 613 are disposed on a side surface of the exterior of the top cover 110 of the circular truncated cone cylinder body. The "radial", "circumferential", "other", and the like are used to distinguish the temperature measuring members according to the installation positions, and are not limited thereto.

In one embodiment, the plurality of sets of radial first temperature measuring members 611 and the plurality of sets of circumferential first temperature measuring members 612 are radially arranged outwards from the center line of the shielding plug 131 (i.e. the center line of the top cover 110).

In an embodiment, each set of radial first temperature measurement components 611 is arranged along a generatrix of the circular table (top cover 110), and 5 to 20 sets of radial first temperature measurement components 611, such as 6 sets, 8 sets, 9 sets, 10 sets, 12 sets, 14 sets, 15 sets, 16 sets, 18 sets, can be uniformly arranged around the axis of the top cover 110 on the side surface of the top cover 110; the number of radial first temperature measurement members 611 included in each set of radial first temperature measurement members 611 may be 3 to 10, for example, 4, 5, 6, 8, 9.

In an embodiment, each set of circumferential first temperature measurement members 612 may be arranged along one coaxial circle of the first opening of the top cover 110, i.e., the plurality of circumferential first temperature measurement members 612 in each set are arranged in a circle, the circle having the same axis as the first opening. On the side of the top cover 110, 5 to 10 sets of circumferential first temperature measuring members 612, for example, 6 sets, 7 sets, 8 sets, 9 sets; the number of circumferential first temperature measurement members 612 included in each set of circumferential first temperature measurement members 612 may be 5 to 25, for example 6, 8, 10, 12, 15, 16, 18, 20, 22, 24.

In an embodiment, a plurality of other first temperature measuring components 613 are disposed around the plurality of penetrating simulation components and the boss 135 on the top cover 110, for example, the penetrating simulation components are all cylindrical, and the plurality of other first temperature measuring components 613 may be arranged along the radial direction and the circumferential direction of the penetrating simulation components with the center line of each penetrating simulation component as the center, for example, 3 sets of other first temperature measuring components 613 may be disposed along the radial direction, and 6 other first temperature measuring components 613 may be disposed along the circumferential direction.

From the previous simulation calculation, it is known that the plurality of through simulation components have large temperature non-uniformity at the position of the through top cover 110, and thermal stress concentration is easily generated. In one embodiment of the present invention, the accuracy of the measured temperature of the outer surface of the top cover 110 can be further improved by providing a plurality of other first temperature measuring members 613. In addition, according to the common sense of heat transfer, the temperature near the root of the rib structure is high, so a plurality of other first temperature measuring members 613 are provided around the boss 135.

Because of the numerous penetrating members such as the main pump, the intermediate heat exchanger, the independent heat exchanger and the like in the top space of the fast reactor, the complex structures can have great influence on convection and radiation heat transfer of high-temperature argon. Therefore, the temperature distribution of the cone head has the characteristic of non-uniformity.

In one embodiment of the present invention, the plurality of first temperature measuring members are arranged in such a manner that the "whole radial" + "penetrating position is locally encrypted", so that the temperature distribution of the top cover 110 can be accurately measured.

In an embodiment, the radial first temperature measuring component 611, the circumferential first temperature measuring component 612 and the other first temperature measuring components 613 may be thermocouples, and the thermocouples may be disposed on the top cover 110 by spot welding.

In one embodiment, the data acquisition system includes a plurality of second temperature measuring components for obtaining the temperature of the inner surface of the top cover 110, wherein the second temperature measuring components are embedded in the cover body of the top cover 110 and are located between the inner surface and the outer surface of the top cover 110. By providing a second temperature measuring member in the cover body of the top cover 110, for example, at a half wall thickness position, the temperature at the half wall thickness position of the top cover 110 can be measured. According to the Fourier heat conduction law, the heat flux density in the direction perpendicular to the thickness direction of the wall surface can be calculated from the temperatures of the outer surface and the half wall thickness position, and the temperature of the inner surface of the top cover 110 can be calculated from the heat flux density in the direction and the temperature of the half wall thickness position.

In an embodiment, the plurality of second temperature measuring components may be disposed in the cover body embedded in the top cover 110 and correspond to the plurality of first temperature measuring components disposed on the top cover 110 one by one.

In one embodiment, the second temperature measuring component may be a thermocouple.

In one embodiment, the data acquisition system includes a plurality of third temperature measurement components 630, the third temperature measurement components 630 being configured to measure the temperature of the gas within the main vessel simulation component 100. Further, the third temperature measuring part 630 may be an armored thermocouple.

For argon gas space, the temperature distribution of the argon gas space is obviously three-dimensional due to complex natural convection heat exchange. Thus, in the height direction, the effective measurement points for measuring the argon gas temperature may be multi-layered, i.e., a plurality of layers of third temperature measuring members 630, for example, 5 layers or 6 layers, may be provided along the height direction of the main vessel simulation member 100.

As shown in fig. 4, in an embodiment, the third temperature measuring part 630 is disposed inside the main container simulation part 100, and in order to avoid the influence of radiation heat transfer on the measurement of the argon temperature in the main container simulation part 100, a heat shielding cover 631 may be disposed in the main container simulation part 100, and the third temperature measuring part 630 may be disposed in the heat shielding cover 631. Further, the heat shielding cover 631 may have a cylindrical structure, and the third temperature measuring component 630 may be disposed inside the cylinder to measure the temperature of the gas in the cylinder.

In one embodiment, heat shield 631 is further coupled to the exhaust tube to increase the convective heat transfer between the measured current and third temperature measuring element 630.

In one embodiment, a bracket 632 is disposed in the main container simulation unit 100 for fixing the third temperature measuring unit 630 and the heat shielding cover 631, and the bracket 632 may be fixed to the bottom of the housing 120.

In one embodiment, the data acquisition system includes a plurality of fourth temperature measurement components for measuring the temperature of the inner surface of the main pump 132. Further, the plurality of fourth temperature measuring parts includes a plurality of surface fourth temperature measuring parts 641.

In one embodiment, the main pump 132 is a cylindrical barrel, and multiple sets of surface fourth temperature measuring components 641 are disposed on the inner surface of the barrel to measure the temperature of the inner surface of the barrel; further, each set of surface fourth temperature measuring parts 641 includes a plurality of surface fourth temperature measuring parts 641, the plurality of surface fourth temperature measuring parts 641 are arranged along a circle coaxial with the cylinder, and a plurality of sets of surface fourth temperature measuring parts 641 which are circularly arranged along the height direction of the cylinder can be arranged.

In an embodiment, each set of surface fourth temperature measuring parts 641 may include 8 surface fourth temperature measuring parts 641, for example, and 5 sets of surface fourth temperature measuring parts 641 may be provided along the height direction of the cylinder. Further, the surface fourth temperature measuring part 641 may be a thermocouple, for example, a K-type thermocouple.

Since the gap between the outer wall of the main pump 132 and the top cover 110 is small, and a part of the structure of the main pump 132 is immersed in the liquid sodium; in addition, the temperature measuring member such as the lead wire of the thermocouple is not easily led out, so it is difficult to directly measure the temperature of the outer surface of the main pump 132. Based on this, an embodiment of the present invention further includes an embedded fourth temperature measuring part 642 embedded in the housing of the main pump 132 (for example, a half-wall thickness position) for measuring the temperature in the housing of the main pump 132; a surface fourth temperature measuring member 641 having the same radius as that of the cylindrical main pump 132 is provided on the inner surface of the main pump 132, and leads 643 of both members are led out through an upper end outlet of the main pump 132. The temperature of the inner surface of the main pump 132 and the temperature of the half wall thickness position are measured respectively by the surface fourth temperature measuring component 641 and the embedded fourth temperature measuring component 642, so that the heat conduction heat flux density in the vertical wall thickness direction can be calculated, and then the temperature of the outer surface outside the corresponding point of the temperature measuring component can be calculated by a one-dimensional steady-state Fourier heat conduction formula.

The "surface", "embedded", and the like are used to distinguish the temperature measuring members according to the installation positions, and are not limited thereto.

In one embodiment, the main vessel simulation member 100, the shielding plug 131, the plurality of through simulation members, the boss 135, and the members located inside the main vessel simulation member 100 may be made of stainless steel.

In the present invention, the other systems and components except the heating system 400, the data acquisition system and the argon gas supply system can be equal-proportion scaling pieces of equipment components in the pool type sodium-cooled fast reactor.

The ratio of the pool type fast reactor main container simulation device to the actual pool type fast reactor main container is 1:2-1:10, such as 1:3, 1:5 and 1:8.

The injection and discharge of liquid sodium and the injection and discharge of argon gas in one embodiment of the present invention are the same as those in the prototype reactor.

The pool type fast reactor main vessel simulation device in an embodiment of the invention can utilize the heating system 400 to enable the sodium liquid level to reach different temperatures from a material changing working condition to an operating working condition, thereby obtaining the temperature distribution of the upper space of the main vessel simulation component 100 under different sodium temperatures. The temperature field of the main vessel simulation component 100 can reduce the temperature field distribution of the prototype reactor by changing the viscosity of the argon (by changing the system pressure) and the like to ensure that the experimental model is equal to the knoop-seeker number and the glas-pef number of the prototype reactor. Further, by measuring the temperature of key components such as the top cover 110 and the main pump 132, whether the temperature of the components exceeds the ductile-brittle transition temperature of stainless steel can be judged, and in addition, the obtained temperature field distribution is favorable for researching the thermal deformation of the fast reactor components, and has important significance for the structural design and key component verification of the pool type sodium-cooled fast reactor main container.

In one embodiment of the invention, the main geometric structure characteristics of the prototype stack are reserved in the upper space of the main container of the pool-type sodium-cooled fast reactor, and the physical parameters of the heat transfer working medium are controlled to be basically the same as those of the prototype, so that the convective heat transfer coefficient and the system radiation emissivity are basically the same as those of the prototype, the dimensionless criterion number similar to the temperature field distribution is ensured, and the main container simulation component 100 of the simulation device can reflect the temperature field of the prototype stack container more accurately.

According to the embodiment of the invention, the temperature distribution of important in-pile components such as a reactor top cover, a main pump supporting structure and the like can be experimentally researched through corresponding simulation pieces (such as the top cover 110, the main pump 132 and the like), and the influence of natural convection of argon and sodium vapor content on the heat transfer characteristic of the upper space of the main container can be qualitatively analyzed. And different temperature measuring methods and measuring point arrangement means are designed according to different structures. The pool type fast reactor main container simulation device of the embodiment can provide test basis for the structural design of the related sodium-cooled fast reactor main container and the verification of key components.

In the cell type fast reactor main vessel simulation device according to one embodiment of the present invention, the operating temperature in the main vessel simulation unit 100 is 200 to 540 ℃ and the operating pressure is 0.050 to 0.304MPa during operation

The invention relates to a pool type fast reactor main vessel simulation device and a use thereof, and more particularly, to a pool type fast reactor main vessel simulation device.

Examples

Referring to the apparatus shown in fig. 1 to 5, the temperature measurement process is as follows:

1) Vacuumizing the main container simulation part 100 to about 30000 Pa;

2) At 25 ℃, a fifth regulating valve 905, a sixth regulating valve 906, a seventh regulating valve 907, an eighth regulating valve 908 and a ninth regulating valve 909 are opened, argon is filled into the main container simulation component 100, and after the argon pressure in the cavity of the main container simulation component 100 rises to 0.05MPa, the regulating valves are closed;

3) After 10 to 12 hours, the vacuum pump 580 is turned on, the twelfth regulating valve 912 is opened, and argon gas in the main vessel simulation part 100 is discharged;

4) Monitoring the pressure in the main tank simulation part 100, and closing the twelfth regulating valve 912 and the vacuum pump 580 when the pressure drops to 10000 Pa;

repeating the steps 2) to 4) three times;

and carrying out a temperature measurement experiment after the steps are completed.

a) Checking whether all equipment, valves and meters work normally or not;

b) The fifth regulating valve 905, the sixth regulating valve 906, the seventh regulating valve 907, the eighth regulating valve 908 and the ninth regulating valve 909 are opened, the main container simulation component 100 is purged by argon of the inert gas supply system 500, and all other valves are opened during the purging process to ensure that the whole simulation device does not contain air;

c) Injecting a certain amount of argon into the cavity of the main container simulation component 100, and monitoring the pressure of the argon to a required value;

d) Opening a second regulator valve 902 in the sodium feed system 300 to keep a third regulator valve 903 and a fourth regulator valve 904 in a closed state, and injecting cold sodium into the main tank simulation member 100 by using the electromagnetic pump 340;

e) Closing solenoid pump 340, closing second regulator valve 902, and placing sodium feed system 300 in a closed state;

f) The electric heater 410 is started to heat the temperature of the sodium pool to a test set value;

g) Measuring and collecting data such as the temperature of each component;

h) The electric heater power supply 420 of the electric heating equipment is turned off, and after the test is completed, the valve third regulating valve 903 and the fourth regulating valve 904 are opened to convey the sodium of the main container simulation component 100 back to the sodium discharge tank 330.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.

Claims

1. A pool type fast reactor main vessel simulation apparatus comprising:

a main vessel simulation component comprising a top cover and a housing;

a data acquisition system;

the heating system is used for heating the liquid sodium; and

2. The pool-type fast reactor main vessel simulation device of claim 1, wherein the top cover is a frustoconical cylinder comprising a first opening, a second opening, and a side surface between the first opening and the second opening; a shielding plug is arranged on the first opening, and the plurality of penetrating simulation components are arranged on the side face.

3. The pool-type fast reactor main vessel simulation apparatus of claim 2, wherein the data acquisition system comprises a plurality of first temperature measurement components disposed on the top cover for measuring the temperature of the outer surface of the top cover.

4. The pool-type fast reactor main vessel simulation apparatus of claim 3, wherein the plurality of first temperature measurement members includes a plurality of sets of radial first temperature measurement members and a plurality of sets of circumferential first temperature measurement members; each group of radial first temperature measuring components are arranged along a generatrix of the circular table, and each group of circumferential first temperature measuring components are arranged along a coaxial circle of the first opening.

5. The pool-type fast reactor main vessel simulation apparatus of claim 4, wherein the plurality of first temperature sensing members further comprises a plurality of other first temperature sensing members, at least a portion of the plurality of other first temperature sensing members being arranged around the plurality of through-simulation members.

6. The pool-type fast reactor main vessel simulation apparatus of claim 2, wherein the data acquisition system includes at least one second temperature measurement component for obtaining a temperature of an inner surface of the top cover.

7. The pool type fast reactor main vessel simulation apparatus according to claim 6, wherein the second temperature measuring part is embedded in the cover body of the top cover and is located between the inner surface and the outer surface of the cover body.

8. The pool-type fast reactor main vessel simulation apparatus of any one of claims 1 to 7, wherein the data acquisition system comprises at least one third temperature measurement component for measuring the temperature of the gas inside the main vessel simulation component.

9. The pool-type fast reactor main vessel simulation apparatus of any one of claims 2 to 8, wherein the data acquisition system includes a plurality of fourth temperature measurement components for measuring the temperature of the main pump.

10. The pool type fast reactor main vessel simulation device according to claim 9, wherein the main pump is a cylinder, the plurality of fourth temperature measuring components comprise a plurality of groups of surface fourth temperature measuring components and a plurality of embedded fourth temperature measuring components, the surface fourth temperature measuring components are used for measuring the temperature of the inner surface of the main pump, and the embedded fourth temperature measuring components are embedded in the shell of the main pump and used for measuring the temperature in the shell of the main pump.