CN112185598B - Stacking type flow distribution device and distribution structure - Google Patents
Stacking type flow distribution device and distribution structure Download PDFInfo
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- CN112185598B CN112185598B CN202011058376.XA CN202011058376A CN112185598B CN 112185598 B CN112185598 B CN 112185598B CN 202011058376 A CN202011058376 A CN 202011058376A CN 112185598 B CN112185598 B CN 112185598B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/02—Details of handling arrangements
- G21C19/04—Means for controlling flow of coolant over objects being handled; Means for controlling flow of coolant through channel being serviced, e.g. for preventing "blow-out"
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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
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- 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
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Abstract
The invention discloses a stacked flow distribution device and a distribution structure, wherein the distribution device comprises a pressure container, a reactor core lower support plate and a hanging basket assembly, the hanging basket assembly is arranged on the reactor core lower support plate, a descending cavity is formed between the hanging basket assembly and the pressure container, a lower cavity is formed below the reactor core lower support plate in the pressure container, the stacked flow distribution device also comprises a stacked flow distribution plate, a plurality of flow distribution holes are arranged on the stacked flow distribution plate, the flow distribution holes penetrate through the stacked flow distribution plate in the vertical direction, each flow distribution hole comprises a straight hole at the upper part and a conical hole at the lower part, the diameter of an upper cone circle of each conical hole is directly larger than that of a lower cone circle, and the diameter of the upper cone circle and the diameter of the lower cone circle of each conical hole from the outside to the outside of the stacked flow distribution plate in the radial direction are gradually increased. The invention solves the problems of uneven flow distribution at the reactor core inlet and complex structure caused by the existing reactor internals.
Description
Technical Field
The invention relates to the technical field of nuclear reactor internals, in particular to a stacked flow distribution device and a stacked flow distribution structure.
Background
In order to meet the requirement of thermal hydraulic power of a reactor and improve the integral performance of the reactor, the coolant entering the reactor core is required to be uniformly distributed, and when the requirement of uniformity is not met, a flow distribution device is often required to be arranged. The space of the lower cavity of the reactor is limited, and the installation and maintenance of the components are difficult, so that the structure is simplified as much as possible on the premise of meeting the flow distribution, and the stability and the reliability are improved. In the domestic and foreign nuclear power second-generation and second-generation improved reactors, reactor core measurement is led out by a lower seal head of a pressure vessel, and a secondary support structure is arranged in a lower cavity. The third-generation reactor core measurement is led out from the upper end socket of the pressure vessel, so that the structure of the lower cavity of the reactor is simplified to a great extent. The second generation improved reactor is not provided with a flow distribution structure, the structure of a lower cavity of the reactor and a flow field are complex, and the stability of the structure is influenced by flow-induced vibration. The secondary supporting structure of the third-generation pressurized water reactor is reserved, the vortex suppression plate assembly is arranged to realize the primary distribution of the coolant flow, the structure of the lower cavity of the third-generation pressurized water reactor is still complex, the secondary supporting structure needs to be installed on site, and the installation and the maintenance are difficult.
Although the problem of uneven distribution of the core inlet coolant can be alleviated to a certain extent by the vortex suppression plate assembly, the uniformity of the core inlet coolant is still poor, the secondary support structure and the vortex suppression plate assembly are complex in structure, and in order to improve the problem of uniform distribution of the core inlet coolant, an additional flow distribution structure needs to be added, which results in a more complex structure.
Disclosure of Invention
The invention aims to provide a stacked flow distribution device and a stacked flow distribution structure, which solve the problems of uneven flow distribution at a reactor core inlet and complicated structure caused by the reactor internals of the existing reactor.
The invention is realized by the following technical scheme:
a stacked flow distribution device comprises a pressure vessel, a reactor core lower supporting plate and a hanging basket assembly, wherein the reactor core lower supporting plate and the hanging basket assembly are arranged in the pressure vessel, the hanging basket assembly is arranged on the reactor core lower supporting plate, an annular descending cavity is formed between the hanging basket assembly and the pressure vessel, a lower cavity is formed below the reactor core lower supporting plate in the pressure vessel, a plurality of through holes which are uniformly distributed are arranged on the reactor core lower supporting plate, the stacked flow distribution device also comprises stacked flow distribution plates, the stacked flow distribution plates are arranged below the reactor core lower supporting plate in the lower cavity, a plurality of flow distribution holes matched with the through holes on the reactor core lower supporting plate are arranged on the stacked flow distribution plates, the flow distribution holes penetrate through the stacked flow distribution plates in the vertical direction, each flow distribution hole comprises a straight hole at the upper part and a conical hole at the lower part, and the diameter of an upper cone of the conical hole is larger than that of the lower cone, the diameter of an upper cone circle and the diameter of a lower cone circle of the cone hole at the center of the stacked flow distribution plate are gradually increased along the radial direction outwards to the outer side of the stacked flow distribution plate.
The applicant finds that the following two main reasons cause the uneven distribution of the core inlet flow rate in long-term tests:
1) the core inlet flow distribution exhibits a tendency of high center and low edge according to the structural characteristics of the reactor and the characteristics of the in-core coolant flow because the coolant has a tendency to descend along the inner wall surface of the lower cavity of the bottom of the reactor pressure vessel and flow toward the center of the lower cavity due to the inertia of the coolant, and this tendency of the coolant flow causes the coolant flow to be distributed more in the middle of the core inlet than in the peripheral portion of the core inlet.
2) In addition, when the coolant enters the lower cavity from the annular descending cavity, the size of the flow channel is changed sharply, so that a large amount of vortexes are generated in the lower cavity, on one hand, the generated vortexes increase energy consumption, the flow is further unevenly distributed, on the other hand, the vortexes fall off to cause vibration of parts such as bolts, and the parts have potential danger of loosening and falling off.
Although the problem of uneven distribution of the core inlet coolant can be alleviated to a certain extent by the vortex suppression plate assembly, the uniformity of the core inlet coolant is still poor, the secondary support structure and the vortex suppression plate assembly are complex in structure, and in order to improve the problem of uniform distribution of the core inlet coolant, an additional flow distribution structure needs to be added, which results in a more complex structure.
According to the invention, the stack type flow distribution plate is arranged in the descending chamber, the coolant impacts the stack type flow distribution plate in the flowing process to change the flowing direction, and the stack type flow distribution plate blocks the complete streamline of a vortex and can inhibit the generation of the vortex; the coolant sequentially enters the flow distribution holes in the stacked flow distribution plate, the sizes of a plurality of through holes in the stacked flow distribution plate are different, the conical diameter and the lower conical diameter of each conical hole are sequentially increased from the center of the stacked flow distribution plate outwards according to a proper proportion, after the coolant enters the lower cavity from the descending cavity, the flowing direction of the coolant flowing at high speed is changed from accumulation in the central area to flowing towards the water holes in the corner areas after passing through the stacked flow distribution plate, so that the water flowing holes in the corner areas obtain relatively more flow, the original uneven flow distribution at the water flowing channel of the lower support plate of the reactor core is effectively improved, the tendency that the coolant flow distribution at the inlet of the reactor core is high in the center and low in the edge is relieved, and the coolant flow uniformity of the inlet of the reactor core is improved.
The stacked flow distribution plate can simultaneously realize the functions of the vortex suppression plate assembly and the flow distribution structure, greatly simplifies the structure, reasonably arranges the structure and the size of the flow distribution holes and improves the uniformity of the coolant flow at the inlet of the reactor core.
In the invention, the primary condition of uniform distribution of the flow entering the reactor core is that the flow flowing out of the outlets of the pore passages of the flow distribution plate is equal, and according to a fluid mechanics continuity equation: the requirement for equal flow through any one of the flow cross-sections in the pipe is that the flow entering each port of the flow distribution plate is equal. And inquiring the existing research data to know that under the condition that the aperture sizes on the existing flow distribution plate are consistent, the flow distribution effect is that the flow distributed from the central position to the edge position is gradually decreased, according to the flow formula Q = AV, if the flow areas A are the same, the intermediate flow is more mainly because the intermediate pressure is strong, the flow speed is faster, and further the flow generated in unit time is more. According to the analysis, to realize equal flow entering through each pore channel of the flow distribution plate, the flow area at the inlet of the flow distribution plate is sequentially increased from the middle to the periphery according to a certain proportional relation, and the specific proportional relation can find out the optimal proportional relation between the flow and the flow area according to the result of sequentially decreasing the flow distributed from the central position to the edge position obtained by simulation under the condition that the aperture of the flow distribution plate is consistent, so that the flow distribution plate with the optimal flow performance and the optimal distribution effect is designed. On the basis of the integrity law, each through-flow hole in each row and each column can be designed with a proper through-flow area, so that the outlet flow of each through-flow hole in the whole through-flow area is basically the same, the purpose is to ensure that the through-flow area of the place with overlarge middle flow velocity is smaller, the outlet flow of the whole flow distribution plate is equal, and the flow is uniformly divided.
Further, the size of the straight hole just covers four corresponding through holes of each group of fuel assemblies on the lower support plate of the reactor core.
If the straight holes in the upper part of the flow distribution plate and the corresponding four through holes of each group of fuel assemblies on the lower support plate of the core do not correspond, i.e. do not cover, this will again cause the flow which has been distributed substantially uniformly to be non-uniform again.
Furthermore, the inner diameters of the straight holes are consistent, and the tapers of the taper holes are consistent.
The above-mentioned arrangement is convenient for processing,
further, the diameter of the upper conical circle of the conical hole is consistent with the inner diameter of the straight hole.
Further, the upper surface of the stacked flow distribution plate is a plane, or a concave surface or a convex surface, and the direction of the straight hole is perpendicular to the upper surface of the stacked flow distribution plate or along the normal direction of the concave surface or the convex surface.
Further, the lower surface of the stacked flow distribution plate is a plane, a concave surface or a convex surface, and the direction of the taper hole is perpendicular to the lower surface of the stacked flow distribution plate or along the normal direction of the concave surface or the convex surface.
Furthermore, the upper part of the straight hole is provided with a round angle, and the lower part of the taper hole is provided with a round angle.
Furthermore, the stacked flow distribution plate is detachably connected with the inner wall of the lower chamber.
The stacked flow distribution plate can be fixed to the inner wall of the lower chamber by means of rotary mounting or by means of bolts or by welding.
Further, the outer wall of the stacked flow distribution plate is provided with a plurality of protruding blocks, a plurality of reactor core radial support pieces are arranged in the inner wall of the lower cavity, and the reactor core radial support pieces are provided with clamping grooves matched with the protruding blocks.
Further, the clamping groove is an L-shaped opening, and 2 open ends of the L-shaped opening respectively point to the radial direction and the circumferential direction of the lower cavity.
A stacked flow distribution structure includes a stacked flow distribution plate
The distribution plate is provided with a plurality of flow distribution holes, the flow distribution holes penetrate through the stacked flow distribution plate in the vertical direction, each flow distribution hole comprises an upper straight hole and a lower conical hole, the diameter of an upper conical circle of each conical hole is larger than that of a lower conical circle, and the diameter of the upper conical circle and the diameter of the lower conical circle of each conical hole in the center of the stacked flow distribution plate are gradually increased along the radial direction outwards to the outer side of the stacked flow distribution plate.
When in use, the stacked flow distribution plate is arranged below the lower support plate of the reactor core in the lower cavity.
In conclusion, the invention greatly simplifies the structure on the basis of realizing the coolant flow distribution of the lower cavity of the reactor. The utility model provides a reactor lower chamber flow distributor which has universality, extremely simple structure, good economical efficiency, practicality, safety and reliability and is used for measuring the pressurized water reactor introduced by the upper end socket of the pressure vessel.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention uniformly distributes the coolant through the lower taper hole and the upper straight hole, overcomes the phenomenon of uneven flow distribution in the inlet area of the reactor core, has obvious distribution effect and meets the thermal hydraulic requirement.
2. The invention greatly simplifies the complex flow distribution structure of the lower cavity of the reactor, improves the stability of the structure, and reduces the cost and the complexity of assembly.
3. The taper of the taper hole is the same, the machining of water inlets with different diameters can be realized by one cutter, and the machining is simple, economic and convenient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of a flow distribution device;
FIG. 2 is a top view of a stacked flow distribution plate;
FIG. 3 is a schematic view of the structure of the core radial support.
Reference numbers and corresponding part names in the drawings:
1-a reactor core lower supporting plate; 2-core radial support; 3-a protruding block; 4-stacked flow distribution plate; 5-a pressure vessel; 6-a basket assembly; 7-a descending cavity; 8-a lower chamber; 9-a flow distribution aperture; 10-card slot.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
as shown in fig. 1 to 3, a stacked flow distribution device includes a pressure vessel 5, a core lower support plate 1 and a basket assembly 6, the core lower support plate 1 and the basket assembly 6 are disposed in the pressure vessel 5, the basket assembly 6 is mounted on the core lower support plate 1, an annular descending cavity 7 is formed between the basket assembly 6 and the pressure vessel 5, a lower cavity 8 is formed in the pressure vessel 5 below the core lower support plate 1, a plurality of uniformly arranged through holes are provided on the core lower support plate 1, a stacked flow distribution plate 4 is further included, the stacked flow distribution plate 4 is mounted below the core lower support plate 1 in the lower cavity 8, a plurality of flow distribution holes 9 matched with the through holes on the core lower support plate 1 are provided on the stacked flow distribution plate 4, the flow distribution holes 9 vertically penetrate through the stacked flow distribution plate 4, the flow distribution holes 9 comprise straight holes at the upper part and conical holes at the lower part, the diameter of an upper conical circle of each conical hole is larger than that of a lower conical circle, the diameter of the upper conical circle of each conical hole is gradually increased along the radial direction outwards to the diameter of the upper conical circle and the diameter of the lower conical circle of each conical hole at the outer side of the stacked flow distribution plate 4, namely, the sizes of a plurality of through holes on the stacked flow distribution plate 4 are different, the diameters of the conical holes and the diameters of the lower conical circles are sequentially increased outwards according to a proper proportion from the center of the stacked flow distribution plate 4, the size of each straight hole just covers four corresponding through holes of each group of fuel assemblies on the lower reactor core support plate 1, namely, the central shaft of each group of fuel assemblies is taken as the shaft, each group of fuel assemblies is provided with a flow distribution hole 9 on the stacked flow distribution plate 4, the circle center of each horizontal row of flow distribution holes 9 on the stacked flow distribution plate 4 are positioned on the same straight line, the circle centers of the flow distribution holes 9 are located on the same straight line, the upper surface of the stacked flow distribution plate 4 is a plane, the direction of the straight hole is perpendicular to the upper surface of the stacked flow distribution plate 4, the lower surface of the stacked flow distribution plate 4 is a convex surface, and the direction of the tapered hole is normal to the lower surface of the stacked flow distribution plate 4.
The working principle of the embodiment is as follows:
firstly, a reactor core is placed on the inner side of a hanging basket assembly 6 at the top of a reactor core lower supporting plate 1, a coolant is introduced into a descending cavity 7 between the hanging basket assembly 6 and the inner wall of a pressure container 5, the coolant flows along the inner wall of the pressure container 5, due to the arranged stacked flow distribution plate 4, the coolant impacts the stacked flow distribution plate 4 in the flowing process to change the flowing direction, the stacked flow distribution plate 4 blocks the complete streamline of a vortex, and the generation of the vortex can be inhibited; the coolant enters the flow distribution holes 9 on the stacked flow distribution plate 4 in sequence, the sizes of a plurality of through holes on the stacked flow distribution plate 4 are different, the diameter of a conical hole cone and the diameter of a lower conical circle are increased gradually from the center of the stacked flow distribution plate 4 to the outside in sequence according to a proper proportion, after the coolant enters the lower cavity 8 from the descending cavity 7, the flowing direction of the coolant flowing at high speed is changed from accumulation in the central area to flowing towards water holes in the corner areas after the coolant passes through the stacked flow distribution plate 4, so that the flowing water holes in the corner areas obtain relatively more flow, the original uneven flow distribution at the flowing water channels of the lower support plate 1 of the reactor core is effectively improved, the tendency that the coolant flow distribution at the center is high and the edge is low due to the inlet coolant flow distribution of the reactor core can be relieved, and the coolant flow uniformity of the reactor core inlet is improved.
Example 2:
as shown in fig. 1 to 3, in this embodiment, based on embodiment 1, the inner diameters of a plurality of straight holes are consistent, and the tapers of a plurality of tapered holes are consistent; the diameter of an upper taper circle of the taper hole is consistent with the inner diameter of the straight hole, a round angle is arranged on the upper portion of the straight hole, and a round angle is arranged on the lower portion of the taper hole.
In the present embodiment, in order to simultaneously satisfy the condition that the tapers of the tapered holes are consistent and the sizes of the through holes on the stacked flow distribution plate 4 are inconsistent, the diameters of the tapered holes and the diameters of the lower tapered circles are sequentially increased from the center of the stacked flow distribution plate 4 outwards according to a proper ratio, and the vertical heights of the straight holes or the tapered holes may be adjusted, for example: when the vertical heights of the straight holes are consistent, the lower surface of the stacked flow distribution plate 4 is a convex surface, that is, the vertical height of the taper hole arranged at the center of the stacked flow distribution plate 4 is greater than the vertical height of the taper hole arranged at the outer side of the stacked flow distribution plate 4, and the vertical height of the taper hole from the center to the outer side along the radial direction is in a decreasing trend, under the condition that the tapers are consistent, the diameter of the lower taper circle of the taper hole at the center of the stacked flow distribution plate 4 is the smallest, and the diameter of the lower taper circle of the taper hole at the outer side of the stacked flow distribution plate 4 is the largest.
Example 3:
as shown in fig. 1 to 3, the present embodiment is based on embodiment 1, and is different from the embodiment in that:
the upper surface and the lower surface of the stacked flow distribution plate 4 are both of a planar structure, in order to simultaneously meet the requirements that the tapers of a plurality of taper holes are consistent and the sizes of a plurality of through holes on the stacked flow distribution plate 4 are inconsistent, the diameters of the taper holes and the diameters of the lower taper holes sequentially increase from the center of the stacked flow distribution plate 4 outwards according to a proper proportion, the vertical height of a straight hole in the center of the stacked flow distribution plate 4 is set to be the minimum, the vertical height of the straight hole increases from the center outwards, the heights of the plurality of flow distribution holes 9 are consistent, namely the vertical heights of the taper holes decrease from the center outwards, under the condition that the tapers are consistent, the diameter of the lower taper hole in the center of the stacked flow distribution plate 4 is the minimum, and the diameter of the lower taper hole in the outer side of the stacked flow distribution plate 4 is the maximum.
Example 4:
as shown in fig. 1 to 3, in the present embodiment, based on embodiment 1, the outer wall of the stacked flow distribution plate 4 is provided with a plurality of protruding blocks 3, the inner wall of the lower chamber 8 is provided with a plurality of core radial supports 2, and the core radial supports 2 are provided with clamping grooves 10 matched with the protruding blocks 3; the clamping groove 10 is an L-shaped opening, and 2 open ends of the L-shaped opening respectively point to the radial direction and the circumferential direction of the lower chamber 8.
In this embodiment, not only is the stacked flow distribution plate 4 detachably connected to the inner wall of the lower chamber 8 by using the radial support key, but also the stacked flow distribution plate has the advantage of convenient operation, specifically:
because the draw-in groove 10 adopts L shape opening, 2 starts of L shape opening point respectively to the radial and circumference of cavity 8 down, when using, in putting into cavity 8 down with stacking type flow distribution board 4, stack type flow distribution board 4 external diameter equals the interval between 2 symmetrical reactor core radial support members 2, protruding piece 3 and reactor core radial support member 2 have the overlap portion in the footpath, the stacking type flow distribution board 4 of circumferential rotation can realize in the draw-in groove 10 is gone into with protruding piece 3 card, direct opposite direction circumferential rotation stack type flow distribution board 4 can when taking out.
Example 5:
as shown in fig. 1 to 3, a stacked flow distribution structure includes a stacked flow distribution plate 4, the stacked flow distribution plate 4 is provided with a plurality of flow distribution holes 9, the flow distribution holes 9 penetrate through the stacked flow distribution plate 4 in a vertical direction, each flow distribution hole 9 includes an upper straight hole and a lower tapered hole, an upper tapered circle diameter of each tapered hole is larger than a lower tapered circle diameter, and the tapered hole at the center of the stacked flow distribution plate 4 is gradually increased from the radial direction to the outer side of the stacked flow distribution plate 4.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A stacked flow distribution device comprises a pressure vessel (5), a reactor core lower supporting plate (1) and a hanging basket assembly (6), wherein the reactor core lower supporting plate (1) and the hanging basket assembly (6) are arranged in the pressure vessel (5), the hanging basket assembly (6) is installed on the reactor core lower supporting plate (1), an annular descending cavity (7) is formed between the hanging basket assembly (6) and the pressure vessel (5), a lower cavity (8) is formed below the reactor core lower supporting plate (1) in the pressure vessel (5), a plurality of through holes which are uniformly distributed are formed in the reactor core lower supporting plate (1), the stacked flow distribution device is characterized by further comprising a stacked flow distribution plate (4), the stacked flow distribution plate (4) is installed below the reactor core lower supporting plate (1) in the lower cavity (8), and a plurality of flow distribution holes (9) which are matched with the through holes in the reactor core supporting plate (1) are formed in the stacked flow distribution plate (4), the flow distribution holes (9) penetrate through the stacked flow distribution plate (4) in the vertical direction, each flow distribution hole (9) comprises an upper straight hole and a lower taper hole, the diameter of an upper taper circle of each taper hole is larger than that of a lower taper circle, and the diameters of an upper taper circle and a lower taper circle of each taper hole at the center of the stacked flow distribution plate (4) are gradually increased along the radial direction outwards to the outer side of the stacked flow distribution plate (4); the size of the straight hole just covers four corresponding through holes of each group of fuel assemblies on the reactor core lower supporting plate (1).
2. The stacked flow distribution device of claim 1, wherein the straight holes have a uniform inner diameter and the tapered holes have a uniform taper.
3. The stacked flow distribution device of claim 1, wherein the tapered bore has an upper conical diameter that is the same as the inner diameter of the straight bore.
4. Stacked flow distribution device according to claim 1, wherein the upper surface of the stacked flow distribution plate (4) is planar or concave or convex, and the direction of the straight holes is perpendicular to the upper surface of the stacked flow distribution plate (4) or normal to the concave or convex.
5. Stacked flow distribution device according to claim 1, wherein the lower surface of the stacked flow distribution plate (4) is planar or concave or convex, and the direction of the taper is perpendicular to the lower surface of the stacked flow distribution plate (4) or normal to the concave or convex.
6. The stacked flow distributor according to claim 1, wherein the upper portion of the straight hole is provided with rounded corners and the lower portion of the tapered hole is provided with rounded corners.
7. The stacked flow distribution device according to claim 6, wherein the outer wall of the stacked flow distribution plate (4) is provided with a plurality of protruding blocks (3), the inner wall of the lower chamber (8) is provided with a plurality of core radial supports (2), and the core radial supports (2) are provided with clamping grooves (10) matched with the protruding blocks (3).
8. A stacked flow distribution device according to claim 7, wherein the clamping groove (10) is an L-shaped opening, the 2 open ends of which are directed radially and circumferentially towards the lower chamber (8), respectively.
9. The stacking type flow distribution structure is characterized by comprising a stacking type flow distribution plate (4), wherein a plurality of flow distribution holes (9) are formed in the stacking type flow distribution plate (4), the flow distribution holes (9) penetrate through the stacking type flow distribution plate (4) in the vertical direction, each flow distribution hole (9) comprises an upper straight hole and a lower tapered hole, the diameter of an upper tapered circle of each tapered hole is larger than that of a lower tapered circle, and the diameter of the upper tapered circle and the diameter of the lower tapered circle of each tapered hole, which are radially outward, in the center of the stacking type flow distribution plate (4) to the outer side of the stacking type flow distribution plate (4) tend to gradually increase; the size of the straight hole just covers four corresponding through holes of each group of fuel assemblies on the reactor core lower supporting plate (1).
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