CN107170491B - Pressurized water reactor flow distribution device based on dome structure - Google Patents
Pressurized water reactor flow distribution device based on dome structure Download PDFInfo
- Publication number
- CN107170491B CN107170491B CN201710575119.5A CN201710575119A CN107170491B CN 107170491 B CN107170491 B CN 107170491B CN 201710575119 A CN201710575119 A CN 201710575119A CN 107170491 B CN107170491 B CN 107170491B
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- plate
- vortex eliminating
- dome structure
- transverse
- flow distribution
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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
- G21C15/12—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from pressure vessel; from containment vessel
-
- 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 pressurized-water reactor flow distribution device based on a dome structure, which comprises a pressure vessel (1), a reactor core lower supporting plate (10), a dome structure (4), a three-dimensional flow equalizing plate (2) and an energy absorbing device (5), wherein a plurality of longitudinal vortex eliminating plates (6) are arranged between the transverse vortex eliminating plates (7) along the circumferential direction of the transverse vortex eliminating plates (7), a guide conical surface (8) is arranged on the outer side of each circle of the transverse vortex eliminating plates (7), and the dome structure (4) is connected with the reactor core lower supporting plate (10) through a flange plate (3) positioned at the top of the dome structure; the three-dimensional flow equalizing plate (2) is arranged in an area surrounded by the longitudinal vortex eliminating plate (6) and the transverse vortex eliminating plate (7), the energy absorbing device (5) is positioned at the bottom of the cavity of the dome structure (4) close to the pressure vessel (1) and fixedly arranged at the intersection of the bottommost ring transverse vortex eliminating plate (7) and the longitudinal vortex eliminating plate (6). The beneficial effects of the invention are as follows: the vortex eliminating effect is good, the stirring effect is good, the flow distribution is uniform, and the original support column assembly is replaced.
Description
Technical Field
The invention relates to the technical field of nuclear power, in particular to a pressurized water reactor flow distribution device based on a dome structure.
Background
The pressurized water reactor of the nuclear power station consists of a reactor pressure vessel, a reactor inner member, a reactor core assembly and other parts. The internals, pressure vessel inner walls and fuel assembly structure form the coolant flow passages. The coolant flows in from the inlets of the reactor pressure vessel through the cold pipe section and the hot pipe section respectively, changes the flowing direction by striking the outer wall of the hanging basket, and most of the coolant flows downwards under the action of gravity and is mixed with other coolants; the existence of the two temperature water inlet pipe sections causes the flow of the coolant to be asymmetric, the flow condition is complex, and the flow distribution of the inlet of the reactor core is uneven. The flow distribution of the core inlet is an important index of the hydraulic performance of the reactor, influences the variation of the power peak factor and the core power distribution in the reactor, and determines the critical heat flow density and the heat pipe factor in the reactor. Once the flow at the inlet of the reactor core is unevenly distributed, the thermodynamic and hydraulic behaviors in the reactor core can be influenced, and then the operation limit value of the nuclear power station is influenced; uneven flow distribution also causes insufficient cooling of the core, and large local temperature changes of the core can bring hidden danger to safe operation of the reactor.
Depending on the structural features of the reactor and the characteristics of the flow of the reactor fluid, the core inlet flow distribution presents a trend of high central edge and low central edge, the reasons for this trend are: due to fluid inertia, the fluid has a tendency to descend along the inner wall surface of the lower chamber of the bottom of the reactor pressure vessel and flow toward the center of the lower chamber, which tends to cause coolant flow to be distributed more in the middle portion of the core inlet than in the peripheral portion of the core inlet.
In addition, when the coolant enters the lower chamber from the annular descending cavity, the size of the flow channel changes sharply, so that a large amount of vortex is generated in the lower chamber, the generated vortex increases energy consumption on one hand, and the flow is further unevenly distributed; on the other hand, the vortex shedding causes the vibration of parts such as bolts and the like, so that the parts have potential danger of loosening and shedding.
The existing flow distribution structure is generally characterized in that a plurality of parts are mounted on a lower support plate of a reactor core to cooperate, but the problems of complex structure, large number of parts, complex assembly, difficult maintenance and replacement and the like exist; the defects of uneven flow distribution, overlarge pressure drop, incomplete vortex elimination and the like also exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the pressurized water reactor flow distribution device based on the dome structure, which has the advantages of simple structure, good vortex eliminating effect, good stirring effect, uniform flow distribution and capability of replacing the original support column assembly.
The aim of the invention is achieved by the following technical scheme: the utility model provides a flow distribution device in pressurized-water reactor based on dome structure, it includes pressure vessel, reactor core lower bearing plate, dome structure, three-dimensional flow equalizing board and energy absorbing device, dome structure sets up in the lower cavity of pressure vessel, dome structure is by many platelike vertical vortex eliminating plates, many rings of horizontal vortex eliminating plates and ring flange are constituteed, lie in between the horizontal vortex eliminating plates and along the circumferencial direction of horizontal vortex eliminating plates a plurality of vertical vortex eliminating plates of distribution, the outside of every round of horizontal vortex eliminating plate all is provided with the guide cone, the cone angle of the guide cone of each round of horizontal vortex eliminating plate is progressively decreased from bottom to top in proper order, dome structure is connected with reactor core lower bearing plate through the ring flange that is located its top; the three-dimensional flow equalizing plate is arranged in an area surrounded by the longitudinal vortex eliminating plate and the transverse vortex eliminating plate, the middle part of the three-dimensional flow equalizing plate is provided with a bending surface, and a plurality of water flowing holes are distributed on the bending surface; the energy absorbing device is positioned at the intersection of the transverse vortex eliminating plate and the longitudinal vortex eliminating plate of the bottommost ring, and the dome structure is close to the bottom of the lower cavity of the pressure vessel; and a hanging basket is fixedly connected to the top of the reactor core lower supporting plate.
A plurality of inserting grooves A are distributed on the lower edge of the transverse vortex eliminating plate along the circumferential direction of the transverse vortex eliminating plate.
The longitudinal vortex eliminating plate is provided with a plurality of inserting grooves B at intervals along the length direction, and the inserting grooves B are clamped in the inserting grooves A.
The flange plate is connected with the reactor core lower supporting plate through screw threads.
The flange plate is welded on the lower reactor core supporting plate.
The outer edge of the three-dimensional flow equalizing plate is provided with a plurality of rabbets along the circumferential direction of the three-dimensional flow equalizing plate.
The spigot of the three-dimensional flow equalizing plate is matched with the inserting groove B of the longitudinal vortex eliminating plate.
The wall thickness of the transverse vortex eliminating plate and the wall thickness of the longitudinal vortex eliminating plate are both 20-100 mm.
The invention has the following advantages:
(1) The outside of each circle of transverse vortex eliminating plate is provided with the guide conical surface, the cone angles of the guide conical surfaces of the transverse vortex eliminating plates of each circle are gradually decreased from bottom to top, and the guide conical surfaces on the transverse vortex eliminating plates guide the coolant to the edge of the inlet of the reactor core, so that the trend that the flow at the inlet of the reactor core is distributed more in the middle and the distribution around the inlet of the reactor core is less is relieved.
(4) According to the invention, the longitudinal vortex eliminating plate and the transverse vortex eliminating plate with dome structures can cut the coolant and block the complete streamline of the vortex, so that the purpose of eliminating the vortex is achieved.
(2) The dome structure has good mechanical property, and under the accident condition that the hanging basket falls, the impact force can be uniformly dispersed and transferred to the edge of the lower support plate of the reactor core, so that the original upright post can be omitted, and the effect of simplifying the structure is achieved; and meanwhile, the upright post is prevented from being perforated and assembled in the core flow distribution area of the lower reactor core supporting plate, so that the flow distribution is more uniform.
(3) The three-dimensional flow equalizing plate is provided with the bending surface in the middle, the three-dimensional flow equalizing plate is provided with a plurality of water flowing holes, compared with a common plane flow equalizing plate, the unfolding area of the three-dimensional flow equalizing plate is larger than the area of a flat plate, namely the number of the water flowing holes of the three-dimensional flow equalizing plate in unit area is larger than that of the water flowing holes of the flat plate, and the space dimension of the equal division is enlarged to enlarge the flow equal division area, so that the fluid pressure drop and the structural resistance coefficient are small. The three-dimensional flow equalizing plate performs secondary distribution on the coolant, so that accurate average flow distribution is realized.
(5) The dome structure of the invention connects the energy absorbing device and the reactor core lower support plate into a whole, replaces the original upright post installation mode, uses fewer screws, simplifies assembly and simplifies the whole structure.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a front cross-sectional view of FIG. 1;
fig. 3 is a schematic structural diagram of a three-dimensional flow equalizing plate in the present invention;
FIG. 4 is a schematic view of the structure of the transverse vortex plate according to the present invention;
FIG. 5 is a schematic view of the structure of a longitudinal vortex breaker plate according to the present invention;
FIG. 6 is a schematic structural view of a dome structure;
in the figure, a 1-pressure vessel, a 2-three-dimensional flow equalizing plate, a 3-flange plate, a 4-dome structure, a 5-energy absorbing device, a 6-longitudinal vortex eliminating plate, a 7-transverse vortex eliminating plate, an 8-guiding conical surface, a 9-water flow hole, a 10-reactor core lower supporting plate, an 11-hanging basket, a 12-inserting groove A, 13-bolts, a 14-spigot and a 15-inserting groove B.
Detailed Description
The invention is further described below with reference to the accompanying drawings, the scope of the invention not being limited to the following:
as shown in fig. 1-6, a pressurized-water reactor flow distribution device based on a dome structure comprises a pressure vessel 1, a reactor core lower support plate 10, a dome structure 4, three-dimensional flow equalizing plates 2 and an energy absorbing device 5, wherein the dome structure is arranged in a lower cavity of the pressure vessel 1, the dome structure 4 consists of a plurality of plate-shaped longitudinal vortex eliminating plates 6, a plurality of rings of transverse vortex eliminating plates 7 and a flange 3, a plurality of longitudinal vortex eliminating plates 6 are arranged between the transverse vortex eliminating plates 7 and distributed along the circumferential direction of the transverse vortex eliminating plates 7, the wall thickness of each of the transverse vortex eliminating plates 7 and the wall thickness of each of the longitudinal vortex eliminating plates 6 are 20-100 mm, the outer side of each ring of the transverse vortex eliminating plates 7 is provided with a guide conical surface 8, the cone angles of the guide conical surfaces 8 of each ring of the transverse vortex eliminating plates 7 are sequentially reduced from bottom to top, and the dome structure 4 is connected with the reactor core lower support plate 10 through the flange 3 positioned at the top.
The three-dimensional flow equalizing plate 2 is arranged in an area surrounded by the longitudinal vortex eliminating plate 6 and the transverse vortex eliminating plate 7, a bending surface is arranged in the middle of the three-dimensional flow equalizing plate 2, a plurality of water flowing holes 9 are distributed on the bending surface, compared with a common plane flow equalizing plate, the three-dimensional flow equalizing plate 2 has a spreading area larger than the area of a flat plate, namely the number of the water flowing holes 9 of the three-dimensional flow equalizing plate 2 in unit area is larger than the number of the water flowing holes of the flat plate, and the space dimension of equal division is enlarged to enlarge the area of equal division of flow. The three-dimensional folded surface on the three-dimensional flow equalizing plate 2 can also play a role of a reinforcing rib, so that the structure is more resistant to fluid scouring.
The energy absorbing device 5 is positioned at the intersection of the transverse vortex eliminating plate 7 and the longitudinal vortex eliminating plate 6 of the bottommost ring, which is close to the bottom of the lower chamber of the pressure vessel 1, of the dome structure 4; the top of the lower core support plate 10 is fixedly connected with a hanging basket 11.
The lower edge of the transverse vortex eliminating plate 7 is provided with a plurality of inserting grooves A12 distributed along the circumferential direction of the transverse vortex eliminating plate 7, the longitudinal vortex eliminating plate 6 is provided with a plurality of inserting grooves B15 at intervals along the length direction of the longitudinal vortex eliminating plate 6, and the inserting grooves B15 are clamped in the inserting grooves A12.
The flange plate 3 is in threaded connection with the reactor core lower support plate 10 through screws 13. The flange 3 is welded to the lower core support plate 10. The outer edge of the three-dimensional flow equalizing plate 2 is provided with a plurality of rabbets 14 along the circumferential direction of the three-dimensional flow equalizing plate 2, and the rabbets 14 of the three-dimensional flow equalizing plate 2 are matched with and welded with the inserting grooves B15 of the longitudinal vortex eliminating plate 6 into a whole.
The working process of the invention is as follows: firstly, placing a reactor core on the top of a reactor core lower supporting plate 10, introducing a coolant into a region between a hanging basket 11 and the inner wall of a pressure vessel 1, cutting the coolant by a transverse vortex eliminating plate 7 and a longitudinal vortex eliminating plate 6 in the process that the coolant flows along the inner wall of the pressure vessel 1, blocking the complete streamline of vortex, achieving the purpose of eliminating vortex, and simultaneously guiding the coolant towards the edge of a reactor core inlet by a guide conical surface 8 on the transverse vortex eliminating plate 7, thereby relieving the trend of more flow distribution in the middle of the reactor core inlet and less distribution around the reactor core inlet; after the coolant enters the dome structure, the preliminary equipartition of flow is realized, the coolant in the dome structure passes through the water flow holes 9 on the three-dimensional flow equalizing plate 2 and the reactor core lower support plate 10 under the action of pressure to enter the reactor core, the three-dimensional flow equalizing plate 2 carries out secondary distribution on the coolant, the purpose of accurate and average flow distribution is achieved, the uniform distribution of the inlet flow of the reactor core is finally realized, and the coolant enters the reactor core after uniform distribution.
When the accident condition that the hanging basket 11 falls off occurs, the energy absorbing device 5 firstly touches the bottom of the contact pressure vessel 1, the energy absorbing device 5 absorbs a part of impact force, most of the impact force is uniformly distributed to the edge of the lower reactor core supporting plate 10 through the longitudinal vortex eliminating plate of the dome structure, the reactor core is prevented from falling, the safety and reliability are realized, and the normal cooling of the reactor core is further ensured.
Claims (8)
1. The utility model provides a pressurized-water reactor flow distribution device based on dome structure which characterized in that: the device comprises a pressure vessel (1), a reactor core lower supporting plate (10), a dome structure (4), a three-dimensional flow equalizing plate (2) and an energy absorbing device (5), wherein the dome structure is arranged in a lower cavity of the pressure vessel (1), the dome structure (4) consists of a plurality of platy longitudinal vortex eliminating plates (6), a plurality of circles of transverse vortex eliminating plates (7) and a flange plate (3), a plurality of longitudinal vortex eliminating plates (6) are arranged between the transverse vortex eliminating plates (7) and distributed along the circumferential direction of the transverse vortex eliminating plates (7), guide conical surfaces (8) are arranged on the outer side of each circle of transverse vortex eliminating plates (7), the cone angles of the guide conical surfaces (8) of all circles of transverse vortex eliminating plates (7) are gradually decreased from bottom to top, and the dome structure (4) is connected with the reactor core lower supporting plate (10) through the flange plate (3) positioned at the top of the dome structure; the three-dimensional flow equalizing plate (2) is arranged in an area surrounded by the longitudinal vortex eliminating plate (6) and the transverse vortex eliminating plate (7), the middle part of the three-dimensional flow equalizing plate (2) is provided with a bending surface, and a plurality of water flowing holes (9) are distributed on the bending surface; the energy absorbing device (5) is positioned at the intersection of the transverse vortex eliminating plate (7) and the longitudinal vortex eliminating plate (6) of the bottommost ring, which is positioned at the bottom of the dome structure (4) close to the lower cavity of the pressure vessel (1); the top of the reactor core lower supporting plate (10) is fixedly connected with a hanging basket (11).
2. A pressurized-water reactor flow distribution device based on a dome structure according to claim 1, wherein: a plurality of inserting grooves A (12) are distributed on the lower edge of the transverse vortex eliminating plate (7) along the circumferential direction of the transverse vortex eliminating plate (7).
3. A pressurized-water reactor flow distribution device based on a dome structure according to claim 1, wherein: a plurality of inserting grooves B (15) are formed in the longitudinal vortex eliminating plate (6) at intervals along the length direction of the longitudinal vortex eliminating plate, and the inserting grooves B (15) are clamped in the inserting grooves A (12).
4. A pressurized-water reactor flow distribution device based on a dome structure according to claim 1, wherein: the flange plate (3) is in threaded connection with the reactor core lower supporting plate (10) through screws (13).
5. The dome-based pressurized-water reactor flow distribution apparatus as set forth in claim 4, wherein: the flange plate (3) is welded on the reactor core lower support plate (10).
6. A pressurized-water reactor flow distribution device based on a dome structure according to claim 1, wherein: the three-dimensional flow equalizing plate (2) is provided with a plurality of rabbets (14) on the outer edge and along the circumferential direction of the three-dimensional flow equalizing plate (2).
7. The pressurized-water reactor flow distribution device based on a dome structure according to claim 6, wherein: the spigot (14) of the three-dimensional flow equalizing plate (2) is matched with the inserting groove B (15) of the longitudinal vortex eliminating plate (6).
8. A pressurized-water reactor flow distribution device based on a dome structure according to claim 1, wherein: the wall thickness of the transverse vortex eliminating plate (7) and the wall thickness of the longitudinal vortex eliminating plate (6) are 20-100 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710575119.5A CN107170491B (en) | 2017-07-14 | 2017-07-14 | Pressurized water reactor flow distribution device based on dome structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710575119.5A CN107170491B (en) | 2017-07-14 | 2017-07-14 | Pressurized water reactor flow distribution device based on dome structure |
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| Publication Number | Publication Date |
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| CN107170491A CN107170491A (en) | 2017-09-15 |
| CN107170491B true CN107170491B (en) | 2023-07-04 |
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| CN201710575119.5A Active CN107170491B (en) | 2017-07-14 | 2017-07-14 | Pressurized water reactor flow distribution device based on dome structure |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112185598B (en) * | 2020-09-30 | 2022-02-01 | 中国核动力研究设计院 | Stacking type flow distribution device and distribution structure |
| CN114912215B (en) * | 2022-04-25 | 2023-06-30 | 安徽理工大学 | Topological structure optimization method of anchor spraying support tray with high energy absorption characteristic |
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Effective date of registration: 20190314 Address after: 610000 No. 328, Section 1, Huayang Changshun Avenue, Shuangliu District, Chengdu City, Sichuan Province Applicant after: NUCLEAR POWER INSTITUTE OF CHINA Address before: 610065 No. 24 south part of Wuhou District first ring road, Chengdu, Sichuan. Applicant before: Sichuan University |
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