CN107103936B - Truss type flow distribution device and internal pile member - Google Patents
Truss type flow distribution device and internal pile member Download PDFInfo
- Publication number
- CN107103936B CN107103936B CN201710535722.0A CN201710535722A CN107103936B CN 107103936 B CN107103936 B CN 107103936B CN 201710535722 A CN201710535722 A CN 201710535722A CN 107103936 B CN107103936 B CN 107103936B
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- truss
- pressure vessel
- flow distribution
- support plate
- reactor core
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/14—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from headers; from joints in ducts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a truss type flow distribution device and a pile internal component, and relates to the technical field of nuclear power. The invention provides a truss type flow distribution device which comprises a pressure vessel, a reactor core lower support plate, a truss support structure and a flow distribution partition plate. The reactor core lower support plate is provided with a plurality of first diversion holes, the reactor core lower support plate is connected with the pressure vessel, a flow passage is arranged between the reactor core lower support plate and the pressure vessel, and the flow passage is communicated with a lower chamber of the pressure vessel. The truss support structure is arranged in the lower cavity of the pressure vessel and is respectively connected with the pressure vessel and the reactor core lower support plate. The flow distributing baffles are mounted on the truss support structure. The invention also provides an internal pile component. The truss type flow distribution device provided by the invention has the advantages of simple structure, simplicity in processing and installation, convenience in maintenance and high reliability of the internal components of the pile. Meanwhile, the device has the characteristics of good vortex suppression effect, good flow distribution effect, good supporting effect and the like.
Description
Technical Field
The invention relates to the technical field of nuclear power, in particular to a truss type flow distribution device and a pile inner member.
Background
The pressurized water reactor body of the nuclear power station comprises a reactor pressure vessel, an internal reactor component, a reactor core assembly, a reactor core instrument and other components, and the reactor pressure vessel, the internal reactor component and the fuel assembly structure together provide a reasonable flow path for cooling the coolant of the reactor core. In a typical pressurized-water nuclear reactor, the reactor consists of 2-4 coolant loops, in each of which coolant enters the pressure vessel through an inlet nipple on the pressure vessel, and most of the coolant flows down along a descent segment between the core basket and the pressure vessel until it enters a lower chamber of the pressure vessel, changes direction, then flows upward through a lower support plate of the core to enter the core, cools the reactor core, and the heated coolant enters an upper chamber and flows out of the pressure vessel through an outlet nipple on the pressure vessel. However, since the lower head of the pressure vessel is generally spherical or dish-shaped, and the lower cavity defined by the lower support plate of the reactor core is approximately hemispherical, when the coolant enters the lower cavity from the descending mixing ring cavity formed by the basket ring segment and the inner wall of the pressure vessel, a large amount of vortex flow is generated in the lower cavity due to abrupt change of the flow channel. The vortex formed in the lower chamber can lead to uneven coolant flow entering the core and flowing through the fuel assemblies at different positions, thereby leading to inconsistent cooling effect; on the other hand, the risk of loosening or falling-off of the in-pile components due to swirl is increased. Therefore, when designing nuclear reactor internals, a device for suppressing or eliminating the vortex and distributing the flow is generally arranged below the reactor core, on the one hand, the vortex formed in the lower chamber is firstly stirred by the device for suppressing or eliminating the vortex, so that the coolant is kept at a certain stability degree; on the other hand, the coolant entering the reactor core is uniformly distributed for a plurality of times through the flow distribution devices (such as the water rail and the reactor core lower support plate), so that the coolant flowing through the fuel assemblies in the reactor core can maintain higher uniformity. In addition, in order to cope with a drop accident of the core, a secondary support device is usually provided below the core to provide auxiliary support for the core assembly when designing the nuclear reactor internals.
The existing flow distribution device mainly comprises 1) a hemispherical, dish-shaped or annular porous fence, and the structure has better flow distribution effect, but is complex to process and relatively high in resistance coefficient; 2) One or more layers of orifice plate type structures have an unsatisfactory flow distribution effect, are relatively complex in structure and installation, are inconvenient to maintain, and have relatively high resistance coefficients; 3) The flow distribution ring is welded and fixed on the pressure vessel, and the maintenance is quite difficult.
The existing reactor core secondary support device mainly comprises a plurality of secondary reactor core support columns and support plates, wherein the secondary support columns are fixed with a reactor core lower support plate through bolts, the structure and the installation of the device are complex, and large vortex shedding risks exist easily.
Disclosure of Invention
The invention aims to provide a truss type flow distribution device which is simple in structure, simple to process and install, convenient to maintain and high in reliability. Meanwhile, the device has the characteristics of good vortex suppression effect, good flow distribution effect, good supporting effect and the like.
Another object of the present invention is to provide a built-in member which is simple in structure, simple in processing and installation, convenient in maintenance, and high in reliability. Meanwhile, the device has the characteristics of good vortex suppression effect, good flow distribution effect, good supporting effect and the like.
The invention provides a technical scheme that:
a truss type flow distribution device is used for distributing flow of coolant. The truss type flow distribution device comprises a pressure vessel, a reactor core lower support plate, a truss support structure and a flow distribution partition plate. The reactor core lower support plate is provided with a plurality of first diversion holes, the reactor core lower support plate is connected with the pressure vessel, a flow passage is arranged between the reactor core lower support plate and the pressure vessel, and the flow passage is communicated with the lower chamber of the pressure vessel so that coolant enters the lower chamber of the pressure vessel through the flow passage. The truss support structure is arranged in the lower cavity of the pressure vessel and is respectively connected with the pressure vessel and the reactor core lower support plate. The flow distribution baffles are mounted to the truss support structure such that coolant passes through the flow distribution baffles and flows into the core through the first flow guide holes.
Further, the truss support structure comprises a first truss structure and a second truss structure, the first truss structure is connected with the second truss structure, one end, away from the second truss structure, of the first truss structure is connected with the pressure vessel, one end, away from the first truss structure, of the second truss structure is connected with the reactor core lower support plate, and the flow distribution partition plate is installed on the second truss structure.
Further, the second truss structure comprises a plurality of regular tetrahedron truss units, the regular tetrahedron truss units are sequentially connected, one end of each regular tetrahedron truss unit is connected with the lower reactor core support plate, the other end of each regular tetrahedron truss unit is connected with the first truss structure, and flow distribution partition plates are arranged on three surfaces of each regular tetrahedron truss unit.
Further, the three faces of the regular tetrahedron truss unit, which are far away from the reactor core lower support plate, are all provided with flow distribution baffles.
Further, the pressure vessel is provided with a first mounting groove cooperating with the first truss structure.
Further, a second installation groove matched with the second truss structure is formed in the reactor core lower support plate.
Further, the pressure vessel is provided with an energy buffer table which is abutted between the pressure vessel and the truss support structure.
Further, the pressure vessel is also provided with a plurality of supporting seats which are clamped with the lower supporting plate of the reactor core.
Further, a first clamping part is arranged on the supporting seat, a second clamping part is arranged on one side, close to the supporting seat, of the reactor core lower supporting plate, and the first clamping part is clamped with the second clamping part.
An in-stack component includes a truss type flow distribution device. The truss type flow distribution device comprises a pressure vessel, a reactor core lower support plate, a truss support structure and a flow distribution partition plate. The reactor core lower support plate is provided with a plurality of first diversion holes, the reactor core lower support plate is connected with the pressure vessel, a flow passage is arranged between the reactor core lower support plate and the pressure vessel, and the flow passage is communicated with the lower chamber of the pressure vessel so that coolant enters the lower chamber of the pressure vessel through the flow passage. The truss support structure is arranged in the lower cavity of the pressure vessel and is respectively connected with the pressure vessel and the reactor core lower support plate. The flow distribution baffles are mounted to the truss support structure such that coolant passes through the flow distribution baffles and flows into the core through the first flow guide holes.
Compared with the prior art, the truss type flow distribution device and the in-pile member have the beneficial effects that:
the coolant enters the lower chamber of the pressure vessel through the flow passage, and a vortex flow is generated in the lower chamber of the pressure vessel due to a large flow rate or the like. Truss support structures connected between the lower core support plate and the pressure vessel may partially eliminate eddies. Meanwhile, the flow distribution partition plates arranged on the truss support structure can split the coolant and further eliminate vortex when the coolant passes through. The coolant flows into the reactor core through the first diversion holes in the lower reactor core support plate after passing through the flow distribution baffle plate. The truss type flow distribution device provided by the invention has the advantages of simple structure, simplicity in processing and installation, convenience in maintenance and high reliability of the internal components of the pile. Meanwhile, the device has the characteristics of good vortex suppression effect, good flow distribution effect, good supporting effect and the like.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. Other relevant drawings may be made by those of ordinary skill in the art without undue burden from these drawings.
FIG. 1 is a schematic view of a truss type flow distribution device according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a truss support structure according to a first embodiment of the present invention;
fig. 3 is a schematic structural view of a first mounting groove according to a first embodiment of the present invention;
FIG. 4 is a schematic view of a pressure vessel according to a first embodiment of the present invention;
fig. 5 is a schematic structural view of a lower support plate for a reactor core according to a first embodiment of the present invention.
Icon: 100-truss type flow distribution device; 110-a pressure vessel; 111-a first mounting groove; 112-a support base; 1121—a first clamping portion; 120-a lower core support plate; 121-a first deflector aperture; 122-a second mounting groove; 123-a second clamping part; 130-truss support structure; 131-a first truss structure; 132-a second truss structure; 140-flow distribution baffles; 141-a second deflector aperture; 150-an energy buffer station; 160-flow channels.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, 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. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
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, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the inventive product is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, terms such as "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between 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.
The following describes specific embodiments of the present invention in detail with reference to the drawings.
First embodiment
Referring to fig. 1, the present embodiment provides a truss type flow distribution device 100, which has simple structure, simple processing and installation, convenient maintenance, and high reliability. Meanwhile, the device has the characteristics of good vortex suppression effect, good flow distribution effect, good supporting effect and the like.
The truss type flow distribution device 100 provided in this embodiment is used for flow distribution of coolant entering the core.
The truss type flow distribution device 100 provided in this embodiment includes a pressure vessel 110, a lower core support plate 120, a truss support structure 130, a flow distribution baffle 140, and an energy buffer stage 150.
The lower core support plate 120 is provided with a plurality of first guide holes 121, the lower core support plate 120 is connected with the pressure vessel 110, and a flow passage 160 is provided between the lower core support plate 120 and the pressure vessel 110. The flow channel 160 communicates with the lower chamber of the pressure vessel 110 such that coolant enters the lower chamber of the pressure vessel 110 via the flow channel 160. The truss support structure 130 is disposed in the lower chamber of the pressure vessel 110 and is connected to the pressure vessel 110 and the lower core support plate 120, respectively. The flow distribution baffle 140 is provided with a plurality of second deflector holes 141, and the flow distribution baffle 140 is mounted on the truss support structure 130 such that the coolant flows into the core through the second deflector holes 141 of the flow distribution baffle 140 and through the first deflector holes 121 of the lower core support plate 120.
It will be appreciated that truss support structure 130 is comprised of a plurality of trusses. The truss support structure 130 may be integrally connected to the pressure vessel 110 and the lower core support plate 120 by welding or the like, or may be detachably connected by fastening or bolts or the like. The flow distribution baffle 140 may be attached to the truss support structure 130 by clamping, welding, or other means of attachment.
It will be appreciated that coolant is conducted through the flow channels 160 to the lower chamber of the pressure vessel 110, and that turbulence may be generated in the lower chamber of the pressure vessel 110 due to a large flow rate or the like. Truss support structures 130 connected between the lower core support plate 120 and the pressure vessel 110 may partially eliminate the vortex. That is, truss support structure 130 may act to inhibit eddy currents. At the same time, the flow distributing baffles 140 mounted to the truss support structure 130 may divert the coolant and further eliminate eddies as the coolant passes. The coolant flows into the core through the first guide holes 121 of the core lower support plate 120 after passing through the second guide holes 141 of the flow distribution partition 140.
Referring to fig. 2, the truss support structure 130 provided in this embodiment includes a first truss structure 131 and a second truss structure 132, the first truss structure 131 is connected to the second truss structure 132, one end of the first truss structure 131 away from the second truss structure 132 is connected to the pressure vessel 110, one end of the second truss structure 132 away from the first truss structure 131 is connected to the lower core support plate 120, and the flow distribution partition 140 is mounted on the second truss structure 132.
It will be appreciated that the first truss structure 131 and the second truss structure 132 are each comprised of a plurality of straight bars.
In this embodiment, the second truss structure 132 includes a plurality of regular tetrahedron truss units (not shown), which are sequentially connected, and one end of which is connected to the core lower support plate 120 and the other end of which is connected to the first truss structure 131, and three of which are provided with flow distribution partitions 140.
It will be appreciated that of the four faces of the regular tetrahedron truss unit, three of which are provided with flow distributing baffles 140. The coolant passes through the flow distribution partitions 140 on the three sides and then flows into the core through the first deflector holes 121 on the lower core support plate 120.
In this embodiment, the regular tetrahedron truss unit is provided with flow distribution baffles 140 on all three sides remote from the lower core support plate 120.
Meanwhile, in the present embodiment, the number of regular tetrahedron truss units is six, and the end shape of the six regular tetrahedron truss units is a regular hexagon.
In this embodiment, the truss support structure 130 is detachably connected to the pressure vessel 110 and the lower core support plate 120, so as to facilitate the installation and the disassembly of the truss support structure 130, and further facilitate the maintenance and the repair of the truss-type flow distribution device 100 provided in this embodiment.
Referring to fig. 1 and 3 in combination, in the present embodiment, the pressure vessel 110 is provided with a first mounting groove 111 that mates with the first truss structure 131.
It should be noted that, since the truss type flow distribution device 100 provided in the present embodiment further includes the energy buffer stage 150 between the pressure vessel 110 and the truss support structure 130, the first mounting groove 111 is disposed on the energy buffer stage 150 for convenience of design and installation.
The energy buffer stage 150 has the effect that when the lower core support plate 120 moves the truss support structure 130 toward the lower chamber of the pressure vessel 110, the energy buffer stage 150 can form a buffer between the truss support structure 130 and the pressure vessel, thereby reducing the rigid contact between the pressure vessel 110 and the truss support structure 130.
In this embodiment, the energy-buffering stage 150 is made of an elastic material. Of course, not limited thereto, in other embodiments of the present invention, the energy buffer stage 150 may be provided with a spring to perform a buffer function or the like.
Referring to fig. 4 and 5 in combination, in the present embodiment, the core lower support plate 120 is provided with a second installation groove 122 that cooperates with the second truss structure 132.
In this embodiment, the lower core support plate 120 is detachably connected to the pressure vessel 110.
It will be appreciated that the detachable connection between the lower core support plate 120 and the pressure vessel 110 is to facilitate the installation and removal of the lower core support plate 120, thereby facilitating the repair, maintenance and replacement of the lower core support plate 120. At the same time, the detachable connection between the lower core support plate 120 and the pressure vessel 110 also provides convenience for the installation and removal of the truss support structure 130.
It will be appreciated that the detachable connection between the truss support structure 130 and the lower core support plate 120 and the pressure vessel 110 is further provided on the basis of the detachable connection of the lower core support plate 120 and the pressure vessel 110.
In the present embodiment, the pressure vessel 110 is provided with a plurality of support seats 112 engaged with the lower core support plate 120. The support base 112 is provided with a first clamping portion 1121, and a second clamping portion 123 is provided on a side of the lower core support plate 120, which is close to the support base 112, and the first clamping portion 1121 is clamped with the second clamping portion 123.
The truss type flow distribution device 100 provided in this embodiment has the following beneficial effects: the coolant passes through the flow passage 160 to the lower chamber of the pressure vessel 110, and a vortex flow is generated in the lower chamber of the pressure vessel 110 due to a large flow rate or the like. Truss support structures 130 connected between the lower core support plate 120 and the pressure vessel 110 may partially eliminate the vortex. At the same time, the flow distributing baffles 140 mounted to the truss support structure 130 may divert the coolant and further eliminate eddies as the coolant passes. The coolant flows into the core through the first guide holes 121 of the core lower support plate 120 after passing through the second guide holes 141 of the flow distribution partition 140. The truss type flow distribution device 100 provided by the embodiment has the advantages of simple structure, simplicity in processing and installation, convenience in maintenance and high reliability. Meanwhile, the device has the characteristics of good vortex suppression effect, good flow distribution effect, good supporting effect and the like.
Second embodiment
The present embodiment provides an in-pile member (not shown) which is simple in structure, simple in processing and installation, convenient in maintenance, and high in reliability. Meanwhile, the device has the characteristics of good vortex suppression effect, good flow distribution effect, good supporting effect and the like.
The present embodiment provides an in-stack component comprising an interconnected reactor body (not shown) and the truss type flow distribution device 100 provided by the first embodiment.
It will be appreciated that the connection may be integrally formed by welding or the like, or may be detachably connected by bolts or the like.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can 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 (7)
1. The truss type flow distribution device is used for distributing the flow of the coolant entering the reactor core and is characterized by comprising a pressure vessel, a reactor core lower support plate, a truss support structure and a flow distribution baffle plate;
the reactor core lower support plate is provided with a plurality of first diversion holes, the reactor core lower support plate is connected with the pressure vessel, a flow passage is arranged between the reactor core lower support plate and the pressure vessel, and the flow passage is communicated with the lower chamber of the pressure vessel so that the coolant enters the lower chamber of the pressure vessel through the flow passage;
the truss support structure is arranged in the lower chamber of the pressure vessel and is respectively connected with the pressure vessel and the reactor core lower support plate;
the flow distribution baffle is provided with a plurality of second diversion holes, and the flow distribution baffle is mounted on the truss support structure so that the coolant passes through the second diversion holes and enters the reactor core through the first diversion holes;
the truss support structure comprises a first truss structure and a second truss structure, the first truss structure and the second truss structure are formed by a plurality of straight rods, the first truss structure is connected with the second truss structure, one end, away from the second truss structure, of the first truss structure is connected with the pressure vessel, one end, away from the first truss structure, of the second truss structure is connected with the reactor core lower support plate, and the flow distribution partition plate is installed on the second truss structure;
the second truss structure comprises a plurality of regular tetrahedron truss units, the regular tetrahedron truss units are sequentially connected, one end of each regular tetrahedron truss unit is connected with the lower reactor core supporting plate, the other end of each regular tetrahedron truss unit is connected with the first truss structure, and three faces of each regular tetrahedron truss unit are provided with the flow distribution partition plates;
and flow distribution baffles are arranged on three surfaces, far away from the reactor core lower support plate, of the regular tetrahedron truss unit.
2. The truss type flow distribution device of claim 1 wherein the pressure vessel is provided with a first mounting groove that mates with the first truss structure.
3. The truss type flow distribution device of claim 1 wherein the lower core support plate is provided with a second mounting groove that mates with the second truss structure.
4. A truss type flow distribution device according to any of claims 1-3, wherein the pressure vessel is provided with an energy buffer stage which is held against between the pressure vessel and the truss support structure.
5. The truss type flow distribution device of any one of claims 1 to 3 wherein the pressure vessel is provided with a plurality of support seats that snap-fit with the lower core support plate.
6. The truss type flow distribution device of claim 5, wherein a first clamping portion is provided on the support base, a second clamping portion is provided on a side of the lower core support plate adjacent to the support base, and the first clamping portion is clamped with the second clamping portion.
7. An in-stack component comprising a truss type flow distribution device according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710535722.0A CN107103936B (en) | 2017-07-03 | 2017-07-03 | Truss type flow distribution device and internal pile member |
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| CN201710535722.0A CN107103936B (en) | 2017-07-03 | 2017-07-03 | Truss type flow distribution device and internal pile member |
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| CN107103936A CN107103936A (en) | 2017-08-29 |
| CN107103936B true CN107103936B (en) | 2023-09-08 |
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| CN109887623A (en) * | 2019-01-25 | 2019-06-14 | 中广核研究院有限公司 | A kind of pool lead base fast reactor with labyrinth path |
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| CN107103936A (en) | 2017-08-29 |
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