CN107221368B

CN107221368B - Reactor coolant vortex suppression and flow distribution device and reactor internal component

Info

Publication number: CN107221368B
Application number: CN201710621581.4A
Authority: CN
Inventors: 李文强; 刘启虞; 李飞; 李松; 冉仁杰; 韩怀邦; 赵玉东
Original assignee: Nuclear Power Institute of China
Current assignee: Nuclear Power Institute of China
Priority date: 2017-07-26
Filing date: 2017-07-26
Publication date: 2023-07-04
Anticipated expiration: 2037-07-26
Also published as: CN107221368A

Abstract

The invention provides a reactor coolant vortex suppression and flow distribution device and a reactor internal component, and belongs to the technical field of nuclear power. The reactor internals include a pressure vessel, a core, a lower core support plate, and a reactor coolant vortex suppression and flow distribution device. The reactor core is positioned in the pressure vessel, the reactor core lower support plate is connected to the lower part of the reactor core, and the reactor coolant vortex suppression and flow distribution device is connected to the lower part of the reactor core lower support plate. Compared with the prior art, the device has the advantages that the flow distribution times of the coolant are more, the space of the lower chamber of the pressure container is effectively filled, the generation of vortex of the lower chamber of the pressure container is avoided, the coolant is effectively stirred, the structure and the connection form of the device are simple, the reliability of the structure is improved, and the installation and the maintenance are convenient.

Description

Reactor coolant vortex suppression and flow distribution device and reactor internal component

Technical Field

The invention relates to the technical field of nuclear power, in particular to a reactor coolant vortex suppression and flow distribution device and a reactor inner member.

Background

In order to meet the requirements of thermal engineering and hydraulic power of a nuclear power station reactor, the overall performance of the reactor is improved, the coolant entering the reactor core is required to be uniformly distributed, and a flow distribution device is often required to be arranged when the uniformity requirement is not met. The space of the lower chamber of the reactor pressure vessel is limited, and the installation and maintenance of components are difficult, so that the structure is simplified as much as possible and the stability and the reliability are improved on the premise of meeting the flow distribution. The reactor core measurement of the nuclear power second generation and second generation improved pressurized water reactor running at home and abroad is led out by the lower end enclosure of the pressure vessel, and a secondary supporting structure is arranged in the lower chamber. The third generation pressurized water reactor core is led out from the upper seal head of the pressure vessel, so that the structure of the lower cavity of the reactor is greatly simplified, but when the coolant flows in from the inlet nozzle of the pressure vessel and enters the lower cavity from the annular descending cavity, the flow channel is changed sharply, the hemispherical seal head has large depth, a large amount of vortex is generated in the lower cavity, the flow field is complicated, the non-uniformity is generated in the flow field at the inlet area of the reactor core, the requirement of uniform distribution of the coolant entering the reactor core is met, the overall performance of the reactor is improved, a flow distribution device is required to be arranged in the lower cavity of the reactor, and the flow distribution and vortex suppression effects of the device are required to be excellent.

Provided are a reactor coolant vortex suppression and flow distribution device and a reactor internal component, which can distribute coolant vortex suppression relatively uniformly, and which have relatively important practical significance for the development of nuclear power technology.

Disclosure of Invention

The invention aims to provide a reactor coolant vortex suppression and flow distribution device which can distribute coolant relatively uniformly and can well suppress vortex generation.

Another object of the present invention is to provide a reactor internals that employs the aforementioned reactor coolant vortex suppression and flow distribution device, so that coolant can be relatively uniformly introduced into the core and vortex generation can be suppressed.

The invention is realized in the following way:

a reactor coolant vortex suppression and flow distribution device for use in distributing flow of coolant within a reactor pressure vessel, the reactor core including a cylindrical basket assembly, the reactor coolant vortex suppression and flow distribution device comprising:

the annular component is a hollow shell and comprises a large end face and a small end face which are parallel to each other, the annular component is provided with a plurality of through holes, the large end face is connected with the hanging basket component,

the annular component comprises a first shell, wherein a plurality of through holes are formed in the first shell, the end face of the first shell is connected with the small end face of the annular component, and the first shell is located outside the annular component.

Further, the method comprises the steps of,

the reactor coolant vortex suppression and flow distribution device further comprises a second shell, a plurality of through holes are formed in the second shell, the end face of the second shell is connected with the small end face of the annular component, and the second shell is located inside the annular component.

Further, the method comprises the steps of,

the first shell is hemispherical, semi-ellipsoidal, disc-shaped, conical or cylindrical; the second shell is hemispherical, semi-ellipsoidal, disc-shaped, conical or cylindrical.

Further, the method comprises the steps of,

the first shell and the second shell can be hemispheric, semi-ellipsoidal, butterfly-shaped, conical or cylindrical with the same shape, or can be hemispheric, semi-ellipsoidal, dish-shaped, conical or cylindrical with different shapes, and the structures formed by the first shell and the second shell can be symmetrical spherical, ellipsoidal structures and the like or asymmetric structures.

Further, the method comprises the steps of,

the shape of the shell of the annular component is conical, cylindrical, a shape formed by a single curved surface or a shape formed by combining a plurality of curved surfaces.

Further, the method comprises the steps of,

the annular member is in a shape cut from a hemispherical shell, and the small end face is a cut face.

Further, the method comprises the steps of,

the distribution and the size of the through holes on the first shell, the second shell and the annular component are different or the same.

Further, the method comprises the steps of,

the annular member is provided with reinforcing ribs.

Further, the method comprises the steps of,

the first shell is connected with the annular component through a flange; the second housing is connected with the annular member through a flange.

A reactor internals, the reactor internals comprising:

the pressure vessel comprises a cylinder body and a sealing head, wherein the sealing head is a hemispherical shell and is connected to one end of the cylinder body, and the sealing head protrudes towards the outside of the cylinder body;

the reactor core is arranged in the pressure vessel and comprises a hanging basket assembly which is cylindrical;

the lower reactor core support plate is of a circular plate-shaped structure, a plurality of through holes are formed in the lower reactor core support plate, and the lower reactor core support plate is connected to the lower end of the hanging basket assembly; and

the reactor coolant vortex suppression and flow distribution device;

the reactor core lower support plate is connected with the lower end of the hanging basket assembly, and the hanging basket assembly and the cylinder body form an annular space;

the coolant vortex suppression and flow distribution device divides and fills the lower chamber space of the reactor pressure vessel.

The beneficial effects of the invention are as follows: when the reactor coolant vortex suppression and flow distribution device and the reactor inner member are used, coolant enters the pressure vessel through the annular space between the hanging basket assembly and the barrel of the pressure vessel, then enters the lower chamber between the cooling device and the seal head, part of coolant enters the annular member through the through holes on the annular member, and the other part of coolant enters the first shell through the first shell at the lower part of the annular member, then enters the annular member for mixing, and finally enters the reactor core through the reactor core lower support plate. The first housing effectively blocks the coolant fluid, the annular member effectively divides the coolant, and the annular member and the first housing cooperate to suppress the generation of vortex. And the annular member and the first shell distribute the coolant, so that the coolant in the annular member is more approximate to a laminar flow state, and the temperature of the coolant is more uniform. When the coolant finally enters the core, the uniformly flowing coolant can cool the core more effectively.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a reactor coolant vortex suppression and flow distribution device and a reactor provided by an embodiment of the present invention;

FIG. 2 is a schematic view of an assembly of a reactor coolant vortex suppression and flow distribution device and reactor internals according to an embodiment of the present invention;

FIG. 3 is a schematic view of the structure of an annular member according to an embodiment of the present invention;

FIG. 4 is a top view of FIG. 3 provided by an embodiment of the present invention;

fig. 5 is a schematic structural view of a second housing according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a first housing according to an embodiment of the present invention.

Icon: 1-a pressure vessel lower chamber; 2-a pressure vessel; 3-an annular drop chamber; 4-a basket assembly; 5-a lower core support plate; a 6-ring member; 61-reinforcing ribs; 62-an annular member upper end flange; 63-a third through hole; 64-a ring-shaped member lower end flange; 7-a second housing; 71-a second through hole; 72-a second flange; 8-a first housing; 81-a first through hole; 82-a first flange.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the present invention, 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; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present invention, unless expressly stated or limited otherwise, a first feature may include first and second features directly contacting each other, either above or below a second feature, or through additional features contacting each other, rather than directly contacting each other. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.

Examples:

as shown in fig. 1 and 2, the present embodiment provides a reactor coolant vortex suppression and flow distribution device and a reactor internals, the reactor internals including a pressure vessel 2, a core, a lower core support plate 5, and a reactor coolant vortex suppression and flow distribution device. The reactor core is located in the pressure vessel 2, the lower core support plate 5 is connected to the lower portion of the reactor core, and the reactor coolant vortex suppression and flow distribution device is connected to the lower portion of the lower core support plate 5.

As shown in fig. 1, the pressure vessel 2 comprises a cylinder and a sealing head, the sealing head is a hemispherical shell, the sealing head is connected to one end of the cylinder, and the sealing head protrudes towards the outside of the cylinder. The core includes a basket assembly 4, and the basket assembly 4 is cylindrical, the lower core support plate 5 is of a circular plate-like structure, and a plurality of through holes are provided in the lower core support plate 5. The lower core support plate 5 is connected to the lower end of the basket assembly 4, and the basket assembly 4 and the barrel form an annular space.

As shown in fig. 1 and 2, the reactor coolant vortex suppression and flow distribution device comprises an annular member 6 and a first shell 8, wherein the annular member 6 is a hollow shell and comprises a large end face and a small end face which are parallel to each other, and the large end face is provided with an annular member upper end face flange 62 for connecting with a reactor core; the small end face is provided with an annular member lower end face flange 64 for connection with the first housing 8. The annular member 6 is provided with a plurality of third through holes 63 for the coolant to pass through. The first housing 8 includes an end surface such that the first housing 8 is not closed as a whole, and the end surface is provided with a first flange 82; the first housing 8 is provided with a plurality of first through holes 81 through which the coolant passes. The first housing 8 is disposed outside the annular member 6 such that the first housing 8 protrudes outward with respect to the annular member 6.

Further, the reactor coolant vortex suppression and flow distribution device further comprises a second shell 7, the second shell 7 has the same structure as the first shell 8, and a second through hole 71 is formed in the second shell 7. A second flange 72 is provided on the end face of the second housing 7. The end face of the second housing 7 is connected to the small end face of the annular member 6, with the difference that the second housing 7 is provided inside the annular member 6. The first housing 8 and the second housing 7 enclose a buffer space.

Further, as shown in fig. 3 and 4, the annular member 6 is in a shape cut from a hemispherical case, and the cut surface is parallel to the large end surface of the hemispherical case; that is, the hemispherical case necessarily includes one annular end surface, the hemispherical case is cut, and the cut surface is parallel to the annular end surface of the hemispherical case, and the cut shape is the shape of the annular member 6. It should be noted that the above cutting method is only for convenience in describing the shape of the annular member 6, and does not represent that the annular member is necessarily obtained by cutting. Of course, the annular member may have other shapes, for example, a tapered shape, a cylindrical shape, or a shape formed by a plurality of curved surfaces.

In addition, in order to prevent deformation of the annular member 6, the annular member 6 is provided with reinforcing ribs 61. Of course, in other embodiments, instead of providing the ribs, an annular member of thicker wall thickness material may be employed to achieve adequate strength and rigidity in complex coolant flow fields.

As shown in fig. 4 and 5, the first casing 8 and the second casing 7 are hemispherical casings, including annular end surfaces. An upper flange is provided on the annular end face of the first housing 8, and the first housing 8 is connected with the small end face of the annular member 6 through the upper flange. The annular end face of the second housing 7 is provided with a lower flange, and the second housing 7 is connected with the small end face of the annular member 6 through the lower flange. The first housing 8 and the second housing 7 together enclose a spherical housing. Of course, in other embodiments, the first housing and the second housing may be hemispherical, semi-ellipsoidal, butterfly, conical or cylindrical, or may be hemispherical, semi-ellipsoidal, disk, conical or cylindrical, which are different in shape, and the structures formed by the first housing and the second housing may be symmetrical spherical, ellipsoidal, or asymmetric. For example, the first housing is cone-shaped, and the second housing is hemispherical; or the first shell is cylindrical, and the second shell is conical.

The working principle of the reactor coolant vortex suppression and flow distribution device provided by the embodiment is as follows:

after the reactor coolant vortex suppression and flow distribution device is assembled into the pressure vessel 2, the annular member 6, the first shell 8 and the second shell 7 effectively divide and fill the space of the lower chamber 1 of the reactor pressure vessel, and stir and equalize the coolant. The coolant enters the pressure vessel lower chamber 1 through the annular space, part of the coolant directly enters the surrounding area through the third through holes 63 of the annular member 6, the other part of the coolant flows to the bottom of the sealing head along with the restraint of the sealing head of the pressure vessel 2, the first shell 8 is arranged at the lower end of the annular member 6, so that the flow distribution device can effectively fill the space at the bottom of the spherical sealing head of the pressure vessel 2 as much as possible, and when the coolant flows through the space, the generation of vortex is restrained and effectively stirred due to the blocking of the first shell 8, and the coolant is primarily split. The coolant entering the area surrounded by the upper and lower hemispherical structures through the first through holes 81 of the first housing 8 can be liquid-mixed in the area, and after the coolant passes through the second through holes 71 on the second housing 7, the second housing 7 performs secondary flow distribution on the coolant; the coolant entering the core support plate inlet region from the through holes in the annular member 6 is mixed with the coolant entering the core support plate inlet region through the second through holes 71 in the second housing 7, and the second housing 7 is provided to secondarily mix and split the coolant.

The reactor coolant vortex suppression and flow distribution device and the reactor core lower support plate 5 are used for distributing the coolant entering the reactor core, the component ensures that the coolant is mixed and distributed twice before entering the inlet of the reactor core lower support plate 5, and the flow distribution is more uniform after the coolant is distributed for three times before entering the reactor core for heat exchange under the action of the flow distribution of the reactor core lower support plate 5, so that the requirement of a reactor core fuel assembly on flow homogenization can be fully met.

Compared with the prior art, the device has the advantages that the flow distribution times of the coolant are more, the space of the lower chamber 1 of the pressure container is effectively filled, the generation of vortex of the lower chamber 1 of the pressure container is avoided, the coolant is effectively stirred, the structure and the connection form of the device are simple, the reliability of the structure is improved, and the installation and the maintenance are convenient.

It should be noted that, in the present embodiment, the first housing may be a semi-ellipsoidal, a disc, a cone, or a cylinder in other embodiments; the second shell can also be a semi-ellipsoidal, a disc, a cone or a cylinder.

In addition, in other embodiments, the distribution and size of the through holes on the first housing, the second housing, and the annular member are different or the same. And the aperture of the flow through holes on the three components and the distribution of the holes on the shell can be respectively and specifically arranged according to the coolant flow field so as to achieve better functions of stirring and flow equalization of the coolant. For example, the third through hole of the annular member may be relatively smaller, and the annular member serves as a constraint to enable more coolant to flow into the bottom of the lower end enclosure of the pressure vessel, so that the stirring effect of the first shell on the liquid is stronger; the first through hole on the first shell can be arranged to be slightly larger than the aperture of the third through hole so as to reduce the flow resistance of the flow and simultaneously play roles in vortex suppression and flow equalization; and secondly, when the second through hole on the second shell is arranged, the aperture of the second through hole can be slightly smaller than that of the first through hole, so that the flow uniformity effect of the second through hole is enhanced. The distribution of the through holes on the three parts can be respectively set so as to adjust the distribution density of the through holes on the shell; meanwhile, the arrangement of the aperture of the through holes on the three components is not limited to the description of the above embodiments, and the aperture size can be reasonably set according to the coolant flow field and the flow sharing requirement.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reactor coolant vortex suppression and flow distribution device for use in a reactor pressure vessel for flow distribution of coolant, the reactor core comprising a cylindrical basket assembly, the reactor coolant vortex suppression and flow distribution device comprising:

the first shell is provided with a plurality of through holes, the end face of the first shell is connected with the small end face of the annular member, and the first shell is positioned outside the annular member;

2. The reactor coolant vortex suppression and flow distribution device of claim 1, wherein the first housing is hemispherical, semi-ellipsoidal, dish, conical or cylindrical; the second shell is hemispherical, semi-ellipsoidal, disc-shaped, conical or cylindrical.

3. The reactor coolant vortex suppression and flow distribution device of claim 1, wherein the first and second shells are hemispherical, semi-ellipsoidal, butterfly, conical or cylindrical with the same shape; or the first shell and the second shell are hemispherical, semi-ellipsoidal, disc-shaped, conical or cylindrical with different shapes and are combined with each other at will; the structure formed by the first shell and the second shell is a symmetrical spherical structure, an ellipsoidal structure or an asymmetrical structure.

4. The reactor coolant vortex suppression and flow distribution device of claim 1, wherein the annular member has a housing shape that is a conical, cylindrical, single curved shape or a combination of curved surfaces.

5. The reactor coolant vortex suppression and flow distribution device of claim 1,

6. The reactor coolant vortex suppression and flow distribution device of claim 1, wherein the distribution and size of the through holes on the first shell, the second shell, and the annular member are different or the same.

7. The reactor coolant vortex suppression and flow distribution device of claim 1, wherein the annular member is provided with reinforcing ribs.

8. The reactor coolant vortex suppression and flow distribution device of claim 1, wherein the first housing is connected to the annular member by a flange; the second housing is connected with the annular member through a flange.

9. A reactor internals, the reactor internals comprising:

the reactor coolant vortex suppression and flow distribution device of any one of claims 1 to 8;