CN108447569B - A kind of primary side of steam generator structure that can alleviate U-tube refluence - Google Patents
A kind of primary side of steam generator structure that can alleviate U-tube refluence Download PDFInfo
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- CN108447569B CN108447569B CN201810195945.1A CN201810195945A CN108447569B CN 108447569 B CN108447569 B CN 108447569B CN 201810195945 A CN201810195945 A CN 201810195945A CN 108447569 B CN108447569 B CN 108447569B
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- straight pipe
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- intermediate header
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
- G21C13/032—Joints between tubes and vessel walls, e.g. taking into account thermal stresses
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
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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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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses the primary side of steam generator structures that one kind can alleviate U-tube refluence, including several U-tubes being arranged in parallel, the U-tube includes import straight pipe, bending section and outlet straight pipe, the input end of the bending section, outlet end are connect with the input end of the outlet end of import straight pipe, outlet straight pipe respectively, the outlet end of the import straight pipe and the input end of bending section are connected by import intermediate header, and the input end of the outlet straight pipe and the outlet end of bending section pass through outlet intermediate header connection.The present invention is acted on by the connection using import intermediate header, outlet intermediate header, it flows backwards phenomenon and alleviates the refluence of u bent tube section in the part that U-tube straight pipe can be effectively eliminated, it solves the problems, such as that flow resistance caused by flowing backwards increases and Natural Circulation driving force is lesser, significantly improves service performance of the steam generator under naturally circulated condition.
Description
Technical field
The present invention relates to reactor thermo-hydraulics and security technology areas, and in particular to one kind can alleviate U-tube refluence
Primary side of steam generator structure.
Background technique
Saturation type steam generator is widely used in pressurized-water reactor nuclear power plant, is connection one secondary circuit heat transfer of reactor
Hinge, be the critical component in reactor nuclear island.Multiple studies have shown that being arranged in the passive residual heat carried out using Natural Circulation
Out under operating condition, saturation type primary side of steam generator part U-tube can be flow backwards, and flow backwards phenomenon under residual heat of nuclear core
It drops and constantly aggravates.It will lead to the increase of positive stream speed due to flowing backwards, increase primary side of steam generator flow resistance, and cause
Cold fluid and hot fluid mixing, declines Natural Circulation driving force, therefore adversely affect to natural-circulation operation, in some instances it may even be possible to threaten anti-
Answer the safe operation of heap.
Saturation type primary side of steam generator is formed in parallel by the U-shaped heat-transfer pipe of enormous amount.During the work time, part
The problem of being flow backwards in U-tube, and then natural-circulation capacity caused to decline.
Summary of the invention
The purpose of the present invention is to provide the primary side of steam generator structures that one kind can alleviate U-tube refluence, solve
It falls the part generated due between U-tube in parallel there are hydrodynamic characteristics difference in existing primary side of steam generator structure
Flow phenomenon.
The present invention is achieved through the following technical solutions:
A kind of primary side of steam generator structure that can alleviate U-tube refluence, including several U-tubes being arranged in parallel,
The U-tube includes import straight pipe, bending section and outlet straight pipe, the input end of the bending section, outlet end respectively with into
The outlet end of mouth straight pipe, the input end connection for exporting straight pipe, the outlet end of the import straight pipe and the import of bending section
End is connected by import intermediate header, and the input end of the outlet straight pipe and the outlet end of bending section pass through outlet intermediate header
Connection.
Saturation type primary side of steam generator is formed in parallel by the U-shaped heat-transfer pipe of enormous amount.U-shaped heat-transfer pipe entrance
Fluid temperature (F.T.) is higher and density is smaller, and in pipe in flow process, fluid constantly discharges heat to secondary side, and temperature is caused to decline
And density increases, and forms that ascent stage density is smaller and the biggish characteristic distributions of descending branch density, this Density Distribution can generate with
The opposite heavy position pressure drop in flow direction.Under the conditions of forced circulation, since flow is big, the temperature difference is small, weight position pressure drop is far below flowing
The friction pressure drop of generation, thus it is negligible.But under naturally circulated condition, the small and dense degree difference of flow is big, in certain condition
Under, weight position pressure drop can be more than flow resistance, so that U-tube inlet pressure is less than outlet, provide external condition for the generation of refluence.
And the hydrodynamic characteristics of each U-tube have differences, then be in the case where primary side of steam generator entirety forward flow,
Occurs the immanent cause flow backwards in the U-tube of part.
Import intermediate header of the present invention, outlet intermediate header are a body structure, are used for straight pipe (import straight tube
Section, outlet straight pipe) and bending section air-flow mixing.
The present invention is based on the principles generated to U-tube water conservancy diversion to analyze, and designs kind of the steam with intermediate header and sends out
Raw side structure of device is arranged on the basis of not changing U-tube basic structure form by importing and exporting in u bent tube section
(import intermediate header is arranged, in outlet straight tube in intermediate header between the outlet end of import straight pipe and the input end of bending section
Setting outlet intermediate header between the input end of section and the outlet end of bending section), change existing primary side of steam generator structure
In the relatively independent operating status of each U-tube, eliminate the flow distribution non-uniform phenomenon in U-shaped heat-transfer pipe parallel connection straight tube, eliminate U
Refluence phenomenon in type pipe parallel connection straight tube alleviates the adverse effect flow backwards to natural-circulation operation.It is embodied in following two side
Face:
1) the refluence phenomenon in straight tube in parallel, is eliminated, the influence flow backwards to flow resistance is overcome:
Intermediate header is imported and exported by setting, guarantees that the inlet outlet pressure differential of each straight pipe in parallel is almost the same.Due to each straight
The structure of pipeline section is identical with length, and when inlet outlet pressure differential is also identical, the flow in each pipeline is answered almost the same, thus eliminates
The phenomenon of flow distribution unevenness in parallel transistor, when primary side of steam generator inlet flow rate is timing, each straight pipe in parallel
In flowing be forward direction.It is flow backwards due to eliminating, can effectively avoid positive stream flow velocity caused by refluence and increase, to solve to flow backwards
The problem of increasing flow resistance.
2) the refluence phenomenon for, alleviating bending section overcomes the influence flow backwards to Natural Circulation driving force:
After intermediate header, difference embodies a concentrated reflection of the curved of heat-transfer pipe between the pipe of original U-shaped heat-transfer pipe of parallel connection (U-tube)
Tune, therefore bending section is likely to occur local refluence.The main drive of refluence is the heavy position pressure drop opposite with flow direction, and weight position
The size of pressure drop depends on duct height again.Compared to the height of entire U-tube, the vertical height of bending section substantially reduces, because
The heavy position pressure drop that this is generated on the pipeline section is also relatively small, and the driving force of refluence obviously weakens.Even still there are a small number of bend pipes
It flows backwards, also only influences whether the heat transfer tube portion (Fig. 3) of header or more.Since bend pipe out temperature in parallel has quite connect
Closely, even if will not be impacted to the Temperature Distribution of heat-transfer pipe region entirety mixed by having, ensure that steam generator is primary
The Natural Circulation driving force of side is not influenced by refluence.
In conclusion the present invention is not changing existing saturation type steam on the basis of Accurate Analysis flows backwards production principle
Under the premise of generator inverted U-shaped structure, a kind of primary side of steam generator structure with intermediate header is devised, can effectively be disappeared
Except U-tube straight pipe part flow backwards phenomenon and alleviate u bent tube section flow backwards, solve flow backwards caused by flow resistance increase and
The lesser problem of Natural Circulation driving force significantly improves service performance of the steam generator under naturally circulated condition.
Further, the input end of import straight pipe is connected to by tube sheet with primary side inlet plenum, the outlet straight tube
The outlet end of section is connected to by tube sheet with primary side outlet chamber.
Further, between tube sheet and import intermediate header at least provided with 2 support posts, in the tube sheet and outlet
Between between header at least provided with 2 support posts.
The stability that the setting of the support post can be improved import intermediate header, export intermediate header.
Further, the lower part of the outlet end insertion import intermediate header of import straight pipe, the input end of the bending section
It is inserted into the top of import intermediate header；The lower part of the input end insertion outlet intermediate header of the outlet straight pipe, the bending
The top of the outlet end insertion outlet intermediate header of section.
Further, the gap between the outlet end of import straight pipe, the input end of bending section and import intermediate header is logical
Welding is crossed to be connected and sealed；The input end of the outlet straight pipe, the outlet end of bending section and the gap for exporting intermediate header
It is connected and sealed by welding.
Further, the outlet end of import straight pipe, bending section input end insertion import intermediate header length be
2-3cm；The input end of the outlet straight pipe, the length of the outlet end insertion outlet intermediate header of bending section are 2-3cm.
Further, the outlet end of import straight pipe, bending section input end in import intermediate header center line do not weigh
It closes；The outlet input end of straight pipe, bending section outlet end in the export between in header center line be not overlapped.
Compared with prior art, the present invention having the following advantages and benefits:
Primary side of steam generator structure of the present invention on the basis of not changing U-shaped heat-transfer pipe basic structure form,
Intermediate header is set by the entrance end in U-shaped heat-transfer pipe bending section, changes each U in existing primary side of steam generator structure
The relatively independent operating status of type pipe eliminates the flow distribution non-uniform phenomenon in U-shaped heat-transfer pipe parallel connection straight tube, eliminates U-shaped biography
Refluence phenomenon in heat pipe parallel connection straight tube alleviates the adverse effect flow backwards to natural-circulation operation.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of primary side of steam generator structure；
Fig. 2 is intermediate header and U-tube installation and seals schematic diagram；
Fig. 3 is the refluence situation schematic diagram of the above U-tube part of intermediate header.
Label and corresponding parts title in attached drawing:
1- primary side inlet plenum, 2- import straight pipe, 3- import intermediate header, 4- bending section, 5- export intermediate header,
6- exports straight pipe, 7- primary side outlet chamber, 8- support post, 9- tube sheet.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1:
As shown in Figure 1 to Figure 3, a kind of primary side of steam generator structure that can alleviate U-tube refluence, if including dry doubling
Join the U-tube of setting, the U-tube includes import straight pipe 2, bending section 4 and outlet straight pipe 6, the import of the bending section 4
End, outlet end are connect with the input end of the outlet end of import straight pipe 2, outlet straight pipe 6 respectively, the import straight pipe 2
Outlet end is connect with the input end of bending section 4 by import intermediate header 3, the input end and bending section 4 of the outlet straight pipe 6
Outlet end connected by outlet intermediate header 5, specifically, import intermediate header 3 is inserted into the outlet end of the import straight pipe 2
Lower part, the bending section 4 input end insertion import intermediate header 3 top；The input end insertion of the outlet straight pipe 6
Export the lower part of intermediate header 5, the top of the outlet end insertion outlet intermediate header 5 of the bending section 4, the import straight pipe
Gap between 2 outlet end, the input end of bending section 4 and import intermediate header 3 is connected and sealed by welding；It is described go out
The gap of the input end of mouth straight pipe 6, the outlet end of bending section 4 and outlet intermediate header 5 is connected and sealed by welding；Institute
The input end for stating import straight pipe 2 is connected to by tube sheet 9 with primary side inlet plenum 1, and the outlet end of the outlet straight pipe 6 is logical
Tube sheet 9 is crossed to be connected to primary side outlet chamber 7.
The specific implementation process of the present embodiment:
1, it is based on U-tube quantity and distribution mode, the knot for determining intermediate header import intermediate header 3, exporting intermediate header 5
Structure size；
2, the processing of intermediate header is completed according to the structure size of design, and it is logical to descend the appropriate location of two sides to open up on it
Hole；
3, by U-tube be split as import straight pipe 2, bending section 4 and outlet straight pipe 6, respectively carry out import straight pipe 2,
The processing and manufacturing of bending section 4 and outlet straight pipe 6；
4, the outlet end of the input end of import straight pipe 2, outlet straight pipe 6 is welded on tube sheet 9 according to predetermined position；
5, the outlet end of import straight pipe 2 is inserted into the lower through-hole of import intermediate header 3 and is welded, straight tube will be exported
In the lower through-hole of the input end insertion outlet intermediate header 5 of section 6 and weld；
6, the input end of bending section 4 is inserted into the upper through-hole of import intermediate header 3 and is welded, by going out for bending section 4
In the upper through-hole of mouth end insertion outlet intermediate header 5 and weld.
Embodiment 2:
As shown in Figure 1 to Figure 3, the present embodiment is based on embodiment 1, is provided between the tube sheet 9 and import intermediate header 3
2 support posts 8 are provided with 2 support posts 8 between the tube sheet 9 and outlet intermediate header 5.
In the present embodiment, the bottom of support post 8 is welded on the upper surface of tube sheet 9, the top of support post 8 and import
The bottom of intermediate header 3, the welding of outlet 5 bottom of intermediate header.By the way that support post 8 is arranged, improves import intermediate header 3, goes out
The stability that mouth intermediate header 5 is installed.
Embodiment 3:
As shown in Figure 1 to Figure 3, the present embodiment is based on embodiment 1, the outlet end of the import straight pipe 2, bending section 4
The length that input end is inserted into import intermediate header 3 is 2-3cm；The outlet of the input end, bending section 4 of the outlet straight pipe 6
The length of end insertion outlet intermediate header 5 is 2-3cm.
In the present embodiment, by import straight pipe 2, bending section 4 and outlet straight pipe 6 be inserted into import intermediate header 3,
The length of outlet intermediate header 5 is set as 2-3cm.It can be improved and improve air-flow in import intermediate header 3, outlet intermediate header 5
Interior mixed effect.
Embodiment 4:
As shown in Figure 1 to Figure 3, the present embodiment is based on embodiment 1, the outlet end of the import straight pipe 2, bending section 4
Input end center line in import intermediate header 3 is not overlapped；The input end of the outlet straight pipe 6, the outlet end of bending section 4 exist
Center line is not overlapped in outlet intermediate header 5.
In the present embodiment, the straight pipe center line for being inserted into header is not overlapped with the center line of bending section, to enhance header
The mixed effect of middle fluid guarantees that the pressure boundary of each straight pipe is consistent.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (7)
1. one kind can alleviate the primary side of steam generator structure of U-tube refluence, including several U-tubes being arranged in parallel, institute
Stating U-tube includes import straight pipe (2), bending section (4) and outlet straight pipe (6), the input end of the bending section (4), outlet
End is connect with the input end of the outlet end of import straight pipe (2), outlet straight pipe (6) respectively, which is characterized in that the import is straight
The outlet end of pipeline section (2) is connect with the input end of bending section (4) by import intermediate header (3), outlet straight pipe (6)
Input end is connect with the outlet end of bending section (4) by exporting intermediate header (5).
2. one kind according to claim 1 can alleviate the primary side of steam generator structure of U-tube refluence, feature exists
In the input end of the import straight pipe (2) is connected to by tube sheet (9) with primary side inlet plenum (1), the outlet straight pipe
(6) outlet end is connected to by tube sheet (9) with primary side outlet chamber (7).
3. one kind according to claim 2 can alleviate the primary side of steam generator structure of U-tube refluence, feature exists
In at least provided with 2 support posts (8), the tube sheet (9) and outlet between the tube sheet (9) and import intermediate header (3)
At least provided with 2 support posts (8) between intermediate header (5).
4. one kind according to claim 1 can alleviate the primary side of steam generator structure of U-tube refluence, feature exists
In the input end of the lower part of outlet end insertion import intermediate header (3) of the import straight pipe (2), the bending section (4) is inserted
Enter the top of import intermediate header (3)；The lower part of input end insertion outlet intermediate header (5) of outlet straight pipe (6), institute
State the top of outlet end insertion outlet intermediate header (5) of bending section (4).
5. one kind according to claim 4 can alleviate the primary side of steam generator structure of U-tube refluence, feature exists
In the gap between the outlet end of the import straight pipe (2), the input end of bending section (4) and import intermediate header (3) passes through
Welding is connected and sealed；The input end of outlet straight pipe (6), the outlet end of bending section (4) and outlet intermediate header (5)
Gap by welding be connected and sealed.
6. one kind according to claim 4 can alleviate the primary side of steam generator structure of U-tube refluence, feature exists
In the outlet end of the import straight pipe (2), the length of input end insertion import intermediate header (3) of bending section (4) are 2-
3cm；The length of outlet end insertion outlet intermediate header (5) of the outlet input end of straight pipe (6), bending section (4) is
2-3cm。
7. one kind according to claim 1 can alleviate the primary side of steam generator structure of U-tube refluence, feature exists
In the outlet end of the import straight pipe (2), the input end of bending section (4) are not weighed in import intermediate header (3) interior center line
It closes；The outlet input end of straight pipe (6), bending section (4) outlet end in the export between header (5) interior center line do not weigh
It closes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810195945.1A CN108447569B (en) | 2018-03-09 | 2018-03-09 | A kind of primary side of steam generator structure that can alleviate U-tube refluence |
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| CN201810195945.1A CN108447569B (en) | 2018-03-09 | 2018-03-09 | A kind of primary side of steam generator structure that can alleviate U-tube refluence |
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| CN108447569A CN108447569A (en) | 2018-08-24 |
| CN108447569B true CN108447569B (en) | 2019-01-22 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112652414B (en) * | 2020-12-16 | 2022-11-01 | 中国人民解放军海军工程大学 | C-shaped tube bundle of reactor steam generator |
| CN113237044A (en) * | 2021-06-16 | 2021-08-10 | 中国人民解放军海军工程大学 | Asymmetric inverted U-shaped tube bundle steam generator for reactor |
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2018
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