CN119446598A - Upper internal reactor component and supercritical water cooled reactor - Google Patents

Abstract

The invention provides an upper internal pile component and a supercritical water cooled pile, wherein the component comprises a compression cylinder and an isolation cylinder, a supporting plate is arranged at the top of the compression cylinder, an accommodating space is formed in the compression cylinder, an isolation plate is further arranged in the compression cylinder, the accommodating space is divided into a first accommodating cavity and a second accommodating cavity along the axial direction of the compression cylinder, the first accommodating cavity is communicated with an outlet connecting pipe, the second accommodating cavity is communicated with an inlet connecting pipe, the isolation cylinder axially penetrates through the accommodating space along the compression cylinder and is connected with the isolation plate at one end, the second accommodating cavity comprises an inlet cold cavity formed by the outer side of the isolation cylinder and the compression cylinder in a matched mode, and an outlet hot cavity in the isolation cylinder, at least two guide cylinder components are arranged in the radial direction of the compression cylinder, at least one guide cylinder component penetrates through the isolation cylinder, and the rest guide cylinder components penetrate through the isolation cylinder. The upper internals described above may separate the low temperature coolant entering the pressure vessel from the high temperature coolant exiting the pressure vessel, meeting the separation requirements of the dual stream Cheng Liudao.

Description

Upper internal reactor component and supercritical water cooled reactor

Technical Field

The invention relates to the technical field of supercritical water cooled reactors, in particular to an upper reactor inner member and a supercritical water cooled reactor.

Background

Supercritical water-cooled reactors are the only water-cooled reactors in 6 reactor types determined by the fourth generation international forum of nuclear energy systems. Single-pass, double-pass, and three-pass coolant reactor structure studies have been conducted. For the three-flow design, the difficulties of the design, manufacture, installation, debugging and overhaul maintenance of the components in the reactor are high, and the axial non-uniformity of the reactor core is high in the single-flow design, so that the double-flow design is adopted.

In the two-pass design, the coolant needs to pass through the core region twice, and the temperature of the coolant gradually rises along with the flow path until the temperature becomes a supercritical state. Because of the safety requirement, the inlet and outlet connection pipes on the reactor pressure vessel are generally positioned above the reactor core, and the cold and hot fluid enters and exits the reactor pressure vessel in the cavity above the reactor core, so that the upper internals in the supercritical water reactor need to be mainly considered to separate the cold and hot fluid flow channels. Secondly, the coolant at the inlet and the outlet has a temperature difference of about 200 ℃, and the cooling fluid needs to be insulated, so that the heat loss caused by the flow passage isolating device is avoided, and the heat efficiency is reduced.

Based on the above, the present inventors have proposed an upper internals and a supercritical water cooled reactor in order to solve the above-mentioned technical problems.

Disclosure of Invention

The invention aims to overcome the defect that an upper internal pile component which does not meet the double-flow-path requirements in the prior art, and provides an upper internal pile component and a supercritical water cooled pile.

The invention solves the technical problems by the following technical proposal:

the invention provides an upper internals, characterized in that it comprises:

The top of the compression cylinder is provided with a supporting plate, the compression cylinder is internally provided with a containing space, the compression cylinder is internally provided with a separation plate, the separation plate axially divides the containing space into a first containing cavity and a second containing cavity along the compression cylinder, the first containing cavity is communicated with the outlet connecting pipe, and the second containing cavity is communicated with the inlet connecting pipe;

The second accommodating cavity comprises an inlet cold cavity formed by the outer side of the isolation cylinder and the compression cylinder in a matched manner and an outlet hot cavity formed in the isolation cylinder, wherein the isolation cylinder axially penetrates through the accommodating space along the compression cylinder and one end of the isolation cylinder is connected with the isolation plate,

At least two guide cylinder assemblies are arranged on the radial direction of the pressing cylinder, at least one of the at least two guide cylinder assemblies is arranged in the isolation cylinder in a penetrating mode, and the rest guide cylinder assemblies are arranged outside the isolation cylinder in a penetrating mode.

According to one embodiment of the invention, the compaction cylinder is provided with at least one circulation hole, and the circulation hole is communicated with the second accommodating cavity and the inlet connecting pipe;

the compressing cylinder is also provided with at least one discharge hole, and the discharge hole is respectively communicated with the outlet connecting pipe and the first accommodating cavity.

According to one embodiment of the invention, the isolation plate is provided with at least one water flowing hole on the inner side of the isolation cylinder, and the water flowing hole is communicated with the first accommodating cavity and the outlet thermal chamber.

According to one embodiment of the invention, the bottom of the compaction cylinder is further provided with a reactor core upper plate, and the second accommodating cavity is arranged between the reactor core upper plate and the isolation plate;

The guide cylinder assembly is provided with at least one through hole at the upper part of the reactor core upper plate, and the through hole is used for guiding or discharging the coolant in the guide cylinder assembly.

According to one embodiment of the invention, the guide cylinder assembly comprises at least one first guide cylinder assembly and at least one second guide cylinder assembly;

The first guide cylinder assembly is positioned outside the isolation cylinder, one end of the first guide cylinder assembly is connected with the support plate, and the other end of the first guide cylinder assembly is connected with the reactor core upper plate and communicated with the first fuel assembly so as to lead a flow coolant from the inlet connecting pipe to the lower chamber;

The second guide barrel assembly is positioned inside the isolation barrel, one end of the second guide barrel assembly is connected with the supporting plate, and the other end of the second guide barrel assembly is connected with the reactor core upper plate and communicated with the second fuel assembly so as to lead the process coolant from the lower chamber to the outlet hot chamber.

According to one embodiment of the invention, the upper core plate is sealingly connected to the hold-down barrel.

According to one embodiment of the invention, a first heat-insulating coating is arranged on the outer peripheral wall of the isolation cylinder;

The isolation plate is positioned on the lower surface of the isolation cylinder and is provided with a second heat-insulating coating.

According to one embodiment of the invention, the thermal barrier coating is a thermal barrier coating.

According to one embodiment of the invention, the separator comprises a mounting outer plate and a mating inner plate;

The middle part of the installation outer plate is provided with a matching groove, and one end cover of the matching inner plate is arranged on the matching groove and is arranged above the installation outer plate.

According to one embodiment of the invention, the mating inner plate and the mounting outer plate are connected by at least one threaded connection;

and the inner matching plate is provided with a unthreaded hole matched with the threaded connecting piece, and the threaded connecting piece and the inner mounting plate form a buffer gap in the unthreaded hole.

The invention also provides a supercritical water cooled reactor, which is characterized by comprising a pressure container and the upper internal reactor component, wherein the upper internal reactor component is arranged in the pressure container.

The invention has the positive progress effects that:

The upper internal pile component, the compression cylinder and the isolation cylinder are matched to separate the coolant with lower temperature entering the pressure vessel from the coolant with higher temperature to flow out of the pressure vessel after being heated by the reactor core, thereby meeting the flow passage separation requirement of double-flow design.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which:

FIG. 1 is a schematic view of the internal structure of the upper internals of the present invention;

FIG. 2 is a top view of the separator of the drawing;

FIG. 3 is a schematic view of the isolation cylinder of FIG. 1;

FIG. 4 is a schematic view of another embodiment of a separator;

FIG. 5 is a partial schematic view of the fitting of the mounting outer panel and the fitting inner panel of FIG. 4;

FIG. 6 is a schematic view of the mounting outer plate of FIG. 4;

fig. 7 is a schematic structural view of another embodiment of the first guide cylinder assembly.

1. The device comprises a compacting cylinder, 11, a supporting plate, 12, a containing space, 13, a separation plate, 131, a water flow hole, 132, a second heat insulation coating, 133, an installation outer plate, 134, a matched inner plate, 135, a matched groove, 136, a threaded connector, 137, a buffer gap, 14, a first containing cavity, 15, a second containing cavity, 16, a flow hole, 17, a discharge hole, 18, a reactor core upper plate and 19, and a first heat insulation coating;

2. an isolation cylinder; 21, an inlet cold chamber, 22, an outlet hot chamber;

3. guide cylinder assembly 31, via hole 32, first guide cylinder assembly 33, second guide cylinder assembly.

Detailed Description

The present invention will be further described with reference to specific embodiments and drawings, in which more details are set forth in the following description in order to provide a thorough understanding of the present invention, but it will be apparent that the present invention can be embodied in many other forms than described herein, and that those skilled in the art may make similar generalizations and deductions depending on the actual application without departing from the spirit of the present invention, and therefore should not be construed to limit the scope of the present invention in terms of the content of this specific embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the above description of the drawings are intended to cover non-exclusive inclusions.

Referring to fig. 1 to 7, the present invention proposes an upper internal reactor component, which comprises a compression cylinder 1 and an isolation cylinder 2, wherein a support plate 11 is disposed at the top of the compression cylinder 1, a containing space 12 is disposed in the compression cylinder 1, an isolation plate 13 is further disposed in the compression cylinder 1, the isolation plate 13 axially divides the containing space 12 into a first containing cavity 14 and a second containing cavity 15 along the compression cylinder 1, the first containing cavity 14 is communicated with an outlet connection pipe, the second containing cavity 15 is communicated with an inlet connection pipe, wherein the inlet connection pipe and the outlet connection pipe are disposed on a pressure vessel, the inlet connection pipe is used for introducing a coolant with a relatively low temperature into the reactor, and the coolant with a high temperature after heating the reactor core is discharged to the outside of the reactor through an outlet connection pipe.

The isolation cylinder 2 axially penetrates through the accommodating space 12 along the compression cylinder 1, one end of the isolation cylinder 2 is connected with the isolation plate 13, the second accommodating cavity 15 comprises an inlet cold cavity 21 formed by the outer side of the isolation cylinder 2 and the compression cylinder 1 in a matched mode and an outlet hot cavity 22 in the isolation cylinder 2, at least two guide cylinder assemblies 3 are radially arranged on the compression cylinder 1, at least one of the at least two guide cylinder assemblies 3 penetrates through the isolation cylinder 2, and the rest of the guide cylinder assemblies 3 penetrate through the isolation cylinder 2.

The top of the compression cylinder 1 is provided with a mounting flange for bearing the weight of the upper internal components during placement, the flange and the compression cylinder 1 are integrally arranged, the periphery of the flange is connected with the top cover of the pressure vessel, and the connection mode can be welding or other modes, and is not limited herein. The support plate 11 serves to isolate the pressure vessel header from the receiving space 12.

The partition plate 13 and the partition cylinder 2 serve to separate a space corresponding to the inlet connection pipe and a space corresponding to the outlet connection pipe. That is, coolant entering through the inlet nipple enters the inlet cold chamber 21 and descends through the first fuel assembly to the lower chamber, and after pooling through the lower chamber, ascends through the second fuel assembly to the outlet hot chamber 22 and flows into the first receiving chamber 14 to further exit the reactor through the outlet nipple.

The first fuel assembly and the second fuel assembly are hollow, one end of the first fuel assembly is connected with the first guide cylinder assembly 32, the other end of the first fuel assembly is connected with the lower chamber at the bottom of the lower plate of the reactor core, one end of the second fuel assembly is connected with the second guide cylinder assembly 33, and the other end of the second fuel assembly is connected with the lower chamber at the bottom of the lower plate of the reactor core. The flow coolant flows through the first pilot cartridge assembly 32 to the first fuel assembly and through the first fuel assembly to the lower chamber where the collected coolant flows up through the second fuel assembly as a flow coolant to the outlet hot chamber 22.

That is, the isolation cylinder 2 is used to distinguish a flow path and a flow path coolant flow path, one end of the isolation cylinder 2 is connected with the isolation plate 13, and the other end extends to the lower core plate through the upper core plate 18 and is communicated with the lower cavity, so that the coolant with lower inlet temperature outside the isolation cylinder 2 is matched with the first fuel assembly to be heated and conveyed to the lower cavity as a flow path coolant, and after being collected in the lower cavity, is heated and conveyed to the outlet thermal cavity 22 as a flow path coolant through the second fuel assembly, and finally is discharged through the outlet connecting pipe.

The isolating cylinder 2 is matched with the compressing cylinder 1, so that the coolant with lower temperature entering the reactor can be separated from the hot coolant with high temperature to be discharged after being heated by the reactor core, and the design requirement of a double-flow-path runner is met.

Referring to fig. 1, the compression cylinder 1 is provided with at least one flow hole 16, the flow hole 16 is communicated with the second accommodating cavity 15 and the inlet connecting pipe, and the compression cylinder 1 is also provided with at least one discharge hole 17, and the discharge hole 17 is respectively communicated with the outlet connecting pipe and the first accommodating cavity 14.

Specifically, a plurality of rows of flow units are circumferentially spaced along the circumference of the compression cylinder 1, and each flow unit is provided with at least one flow hole 16 along the axial direction of the compression cylinder 1, where each flow unit includes three flow holes 16 as an example, and the number and arrangement of the flow holes 16 are not limited herein.

Accordingly, the number of the water flow holes 131 is identical to the number of the outlet connection pipes, which is not limited herein.

Referring to fig. 1 to 4, the isolation plate 13 has at least one water hole 131 formed inside the isolation cylinder 2, and the water hole 131 communicates with the first accommodating chamber 14 and the outlet thermal chamber 22.

Further, the bottom of the compression cylinder 1 is also provided with a core upper plate 18, a second accommodating cavity 15 is arranged between the core upper plate 18 and the isolation plate 13, and the guide cylinder assembly 3 is provided with at least one through hole 31 at the upper part of the core upper plate 18, wherein the through hole 31 is used for guiding or discharging the coolant in the guide cylinder assembly 3.

It is known that the guide cylinder assembly 3 is provided with a through hole 31 (see below) at the top of the upper core plate 18, so that the heated coolant flows to the outlet hot chamber 22 through the through hole 31, is discharged into the first accommodating chamber 14 through the water hole 131, and finally is discharged to the outside of the reactor through the outlet pipe.

Or in some other embodiments, the guide cylinder assembly 3 is provided with a through hole 31 above the partition 13, so that the coolant heated by the second fuel assembly can directly reach the first accommodating cavity 14 to be directly discharged from the outlet connection pipe.

Alternatively, referring to FIG. 7, in some other embodiments, the guide barrel assembly 3 is provided with through holes 31 above the upper core plate 18 and above the isolation plate 13, thereby improving the hot coolant discharge efficiency. The opening position of the via hole 31 in fig. 7 can be adjusted according to different embodiments, and is not limited herein.

In one embodiment, the guide barrel assembly 3 includes at least one first guide barrel assembly 32 and at least one second guide barrel assembly 33, the first guide barrel assembly 32 being located outside the spacer barrel 2 and having one end connected to the support plate 11 and the other end connected to the upper core plate 18 and communicating with the first fuel assembly to direct a process coolant from the inlet nozzle to the lower chamber, and the second guide barrel assembly 33 being located inside the spacer barrel 2 and having one end connected to the support plate 11 and the other end connected to the upper core plate 18 and communicating with the second fuel assembly to direct the coolant of the lower chamber up into the outlet hot chamber 22.

The first guide cylinder assemblies 32 are spatially distributed outside the barrier cylinder 2 so as to uniformly convey the coolant flowing in through the inlet nipple to the first fuel assembly.

Correspondingly, the second guide cylinder assemblies 33 are spatially distributed inside the separating cylinder 2, so that the coolant collected in the lower chamber is conveyed into the outlet thermal chamber 22 by the plurality of second guide cylinder assemblies 33 to be collected and finally discharged outwards through the first receiving chamber 14 and the outlet nipple.

In one embodiment, the upper core plate 18 is sealingly connected to the hold-down barrel 1. The upper core plate 18 is sealingly connected to the hold-down barrel 1, for example, by welding, thus preventing the cold and hot fluids from mixing through the gap to affect the outlet hot coolant temperature.

It is known that the first thermal insulation coating 19 is provided on the outer peripheral wall of the barrier cylinder 2, and the second thermal insulation coating 132 is provided on the lower surface of the barrier plate 13 located on the barrier cylinder 2.

The isolation plate 13 and the isolation cylinder 2 are mainly used for isolating cold and hot fluid, the temperature of the inlet coolant is far lower than that of the outlet coolant, the temperature difference between two sides of the inlet coolant and the outlet coolant is large, and if heat preservation and heat insulation are not carried out, heat is dissipated into the inlet cold chamber 21 through the isolation plate 13 and the isolation cylinder 2, so that the heat efficiency is reduced.

Therefore, the first heat-insulating coating 19 is arranged on the peripheral wall of the isolation cylinder 2, and the second heat-insulating coating 132 is arranged on the inner side of the isolation plate 13 and positioned on the outer side of the isolation cylinder 2, so that the heat loss of the coolant passing through the isolation plate 13 and the isolation cylinder 2 after heating is reduced, and the heat efficiency is improved.

Optionally, the thermal barrier coating is a thermal barrier coating to meet thermal insulation requirements. In some other embodiments, other thermal barrier coating materials may be used, without limitation.

Referring to fig. 5 and 6, the isolation plate 13 includes an outer mounting plate 133 and an inner mating plate 134, wherein a mating groove 135 is formed in the middle of the outer mounting plate 133, and an end cap of the inner mating plate 134 is disposed in the mating groove 135 and is mounted above the outer mounting plate 133.

Further, the inner mating plate 134 is connected to the outer mounting plate 133 via at least one threaded connector 136, the inner mating plate 134 is provided with a hole for mating with the threaded connector, and the threaded connector 136 forms a buffer gap 137 with the inner mounting plate 134 in the hole.

It is known that the temperature of the middle part of the partition plate 13 is higher than that of the outer ring, and at high temperature, the middle part is easily arched, and larger thermal deformation and thermal stress are generated.

Accordingly, the present invention divides the partition plate 13 into the installation outer plate 133 and the installation inner plate 134 which are fitted to each other, and the installation inner plate 134 is capped at one end thereof at the fitting groove 135 and is radially clearance-fitted with the installation outer plate 133, so that the buffer gap 137 can absorb the radial thermal expansion difference of the installation outer plate 133 and the installation inner plate 134, thereby protecting the installation inner plate 134 and the installation outer plate 133 from excessive thermal deformation and thermal stress.

The coolant flow paths of the present invention are as follows:

The coolant flows through the reactor inlet header to the inlet cold chamber 21 and, after mixing in the inlet cold chamber 21, flows down as a flow coolant through the first pilot cartridge assembly 32 and the first fuel assembly to the lower chamber, wherein a flow restriction device, such as a one-way valve, is provided on top of the first pilot cartridge assembly 32 and the second pilot cartridge assembly 33 so that the coolant does not flow up to the pressure vessel header area.

When the flow coolant reaches the lower chamber, the merged coolant flows up as a flow coolant through the second fuel assembly and the second guide cylinder assembly 33 to the outlet hot chamber 22, flows to the first accommodating chamber 14 after the outlet hot chamber 22 is fully mixed, and is discharged to the outside of the reactor through the outlet pipe communicated with the first accommodating chamber 14 after the first accommodating chamber 14 is further uniformly mixed.

The invention also provides a supercritical water cooled reactor, which comprises a pressure vessel and the upper internal reactor component, wherein the upper internal reactor component is arranged in the pressure vessel.

In summary, the upper internal pile component of the invention, the compressing cylinder 1 and the isolating cylinder 2 cooperate to isolate the coolant with lower temperature entering the pressure vessel from the coolant with higher temperature to flow out of the pressure vessel after being heated by the reactor core, thereby meeting the flow passage separation requirement of the double-flow design.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, or mechanically connected, as will be apparent to those of ordinary skill in the art, in view of the detailed description of the embodiments of the present application.

The application uses specific words to describe embodiments of the application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.

While the invention has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the invention, as will occur to those skilled in the art, without departing from the spirit and scope of the invention. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention fall within the protection scope defined by the claims of the present invention.

Claims (11)

1. An upper in-pile component is provided, which is characterized by that, characterized by comprising the following steps:

The top of the compression cylinder is provided with a supporting plate, the compression cylinder is internally provided with a containing space, the compression cylinder is internally provided with a separation plate, the separation plate axially divides the containing space into a first containing cavity and a second containing cavity along the compression cylinder, the first containing cavity is communicated with the outlet connecting pipe, and the second containing cavity is communicated with the inlet connecting pipe;

The second accommodating cavity comprises an inlet cold cavity formed by the outer side of the isolation cylinder and the compression cylinder in a matched manner and an outlet hot cavity formed in the isolation cylinder, wherein the isolation cylinder axially penetrates through the accommodating space along the compression cylinder and one end of the isolation cylinder is connected with the isolation plate,

At least two guide cylinder assemblies are arranged on the radial direction of the pressing cylinder, at least one of the at least two guide cylinder assemblies is arranged in the isolation cylinder in a penetrating mode, and the rest guide cylinder assemblies are arranged outside the isolation cylinder in a penetrating mode.

2. The upper internals according to claim 1, wherein the compaction cylinder is provided with at least one flow aperture communicating with the second receiving chamber and the inlet nipple;

the compressing cylinder is also provided with at least one discharge hole, and the discharge hole is respectively communicated with the outlet connecting pipe and the first accommodating cavity.

3. The upper internals of claim 1 wherein the separator plate defines at least one water flow aperture inside the separator bowl, the water flow aperture in communication with the first receiving cavity and the outlet thermal chamber.

4. The upper internals of claim 1 wherein the hold down barrel bottom is further provided with an upper core plate, the second receiving cavity being between the upper core plate and the separator plate;

The guide cylinder assembly is provided with at least one through hole at the upper part of the reactor core upper plate, and the through hole is used for guiding or discharging the coolant in the guide cylinder assembly.

5. The upper internals of claim 4 wherein the guide cylinder assemblies include at least one first guide cylinder assembly and at least one second guide cylinder assembly;

The first guide cylinder assembly is positioned outside the isolation cylinder, one end of the first guide cylinder assembly is connected with the support plate, and the other end of the first guide cylinder assembly is connected with the reactor core upper plate and communicated with the first fuel assembly so as to lead a flow coolant from the inlet connecting pipe to the lower chamber;

The second guide barrel assembly is positioned inside the isolation barrel, one end of the second guide barrel assembly is connected with the supporting plate, and the other end of the second guide barrel assembly is connected with the reactor core upper plate and communicated with the second fuel assembly so as to lead the process coolant from the lower chamber to the outlet hot chamber.

6. The upper internals of claim 4 wherein the upper core plate is sealingly connected to the hold-down barrel.

7. The upper internals of claim 1 wherein the barrier cylinder outer peripheral wall is provided with a first thermal barrier coating;

The isolation plate is positioned on the lower surface of the isolation cylinder and is provided with a second heat-insulating coating.

8. The upper internals of claim 7 wherein the thermal barrier coating is a thermal barrier coating.

9. The upper internals of claim 1 wherein the separator plate includes a mounting outer plate and a mating inner plate;

The middle part of the installation outer plate is provided with a matching groove, and one end cover of the matching inner plate is arranged on the matching groove and is arranged above the installation outer plate.

10. The upper internals according to claim 9, wherein the mating inner plate and the mounting outer plate are connected by at least one threaded connection;

and the inner matching plate is provided with a unthreaded hole matched with the threaded connecting piece, and the threaded connecting piece and the inner mounting plate form a buffer gap in the unthreaded hole.

11. A supercritical water cooled reactor comprising a pressure vessel and an upper internals according to any one of claims 1 to 10 mounted within the pressure vessel.