CN203465955U - Stepped steam-generator water feeding pipe capable of reducing phenomenon of thermal stratification effectively - Google Patents
Stepped steam-generator water feeding pipe capable of reducing phenomenon of thermal stratification effectively Download PDFInfo
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- CN203465955U CN203465955U CN201320434955.9U CN201320434955U CN203465955U CN 203465955 U CN203465955 U CN 203465955U CN 201320434955 U CN201320434955 U CN 201320434955U CN 203465955 U CN203465955 U CN 203465955U
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- stepped appearance
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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 utility model relates to a stepped steam-generator water feeding pipe capable of reducing the phenomenon of thermal stratification effectively. The stepped steam-generator water feeding pipe is arranged between a secondary cooling water inlet of a steam generator and a water feeding ring of the steam generator and comprises a stepped reducing pipe section and a stepped diverging pipe section which are connected into a whole; the large pipe-diameter end of the stepped reducing pipe section is communicated with the cooling water inlet; the large pipe-diameter end of the stepped diverging pipe section is communicated with the water feeding ring; and the small pipe-diameter end of the stepped reducing pipe section is integrally connected with the small pipe-diameter end of the stepped diverging pipe section. The stepped steam-generator water feeding pipe has the advantages that by means of reducing and diverging a flow channel, the flowing speed in the pipe is increased, the stirring and the mixing effect of cold and hot fluid is enhanced, and the phenomenon of the thermal stratification in the water feeding ring of the steam generator under the working condition of low-power operation can be effectively reduced.
Description
Technical field
The present invention relates to pressurized-water reactor nuclear power plant technical field, be specifically related to a kind of stepped appearance steam generator feed pipe that can effectively extenuate thermal stratification.
Background technology
PWR nuclear power plant (starts and shutdown process) under low power run operating mode, before steam generator puts into operation, high-temperature water heated feed water entrance horizontal segment in steam generator and the residual feedwater of elbow, reach unanimity temperature in residual feed temperature and steam generator secondary side.After steam generator puts into operation, the feedwater that temperature is lower flows into feedwater elbow and feed pipe horizontal segment by feed pipe.In feedwater endless tube, original residual feed temperature is relatively high, in the situation that feedwater low discharge injects, because cold and hot fluid lacks fully, mixes, and in feedwater endless tube, residual feed temperature is high, and density is little, occupies the top of feedwater endless tube; The temperature of feedwater is low, and density is large, occupies the bottom of feedwater endless tube.In the case, between cold water layer and hot water layer, just formed cold fluid and hot fluid interface.In engineering, above-mentioned phenomenon is called to steam generator feedwater endless tube thermal stratification.
The thermal stratification of steam generator feedwater endless tube inner fluid makes feed pipe inner fluid top higher than the temperature of bottom, in feedwater endless tube cross section, produces additional overall crooked thermal stress; In addition, thermally stratified layer produces significant hot line vibration on cold fluid and hot fluid interface while occurring, and this oscillation action, in inner-walls of duct face, causes localized heat stress.After the stack of two kinds of stress, can produce the harm such as pipeline cracking, displacement, heat fatigue, bending and support unit load is excessive, in serviceable life that may restriction conduit, steam generator be carried out to its function composing and necessarily threaten.
Summary of the invention
The technical matters that will solve of the present invention is to provide a kind of by special feed pipe structure, strengthen the degree of mixing of steam generator feed-water intake cold fluid and hot fluid under low power run operating mode, extenuate the stepped appearance steam generator feed pipe of the thermal stratification in feedwater endless tube.
In order to solve the problems of the technologies described above, technical scheme of the present invention is, a kind of stepped appearance steam generator feed pipe that can effectively extenuate thermal stratification, be arranged on described steam generator secondary cooling water entrance and steam generator between water ring, comprise stepped appearance convergent pipeline section and stepped appearance flaring pipeline section that integral type connects, described stepped appearance convergent pipeline section Large Diameter Pipeline end is communicated with described cooling water inlet, described stepped appearance flaring pipeline section Large Diameter Pipeline end is communicated with to water ring with described, the pipe with small pipe diameter end of described stepped appearance convergent pipeline section is connected with the pipe with small pipe diameter end integral type of described stepped appearance flaring pipeline section.
Described stepped appearance convergent pipeline section comprises the convergent classification pipeline section that several diameters reduce gradually, and the shrinkage ratio of adjacent two convergent classification pipeline section internal diameters is 1:0.85.
Described stepped appearance flaring pipeline section comprises the flaring classification pipeline section that several diameters expand gradually, and the expansion of adjacent two flaring classification pipeline section internal diameters is than being 1:0.85.
Between described adjacent two convergent classification pipeline sections, all have transition circular cone chamfering between adjacent two flaring classification pipeline sections, this transition circular cone chamfering is 86 °.
Beneficial effect of the present invention:
Stepped appearance steam generator feed pipe of the present invention relies on contracting, expands runner, has improved velocity in pipes, strengthens cold fluid and hot fluid and mixes, and can effectively extenuate the thermal stratification in steam generator feedwater endless tube under low power run operating mode.
Accompanying drawing explanation
Fig. 1 is steam generator schematic diagram in presurized water reactor;
Fig. 2 is a kind of stepped appearance steam generator feed pipe schematic diagram that can effectively extenuate thermal stratification of the present invention;
In figure: 1-steam generator, 101-steam generator shell, 102-steam-water separator, 103-exsiccator, 104-steam (vapor) outlet, 105-is to water ring, 106-secondary cooling water entrance, 107-tube bank, 108-primary cooling water enters chamber, 109-primary cooling water output chamber, 110-primary cooling water entrance, the outlet of 111-primary cooling water, 2-case side is taken over, 3-stepped appearance feed pipe, 301-first order stepped appearance convergent pipeline section, 302-second level stepped appearance convergent pipeline section, 303-third level stepped appearance convergent pipeline section, 304-first order stepped appearance flaring pipeline section, 305-second level stepped appearance flaring pipeline section, 306-third level stepped appearance flaring pipeline section, the 4-threeway of feeding water, 5-J shape pipe.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
In Fig. 1, show a kind of example of steam generator, this steam generator 1 comprises tube bank 107, and this tube bank 107 is arranged on the bottom of steam generator shell 101 inner sides, and is immersed in secondary cooling water.Tube bank 107 is made into inverted U-shaped, one end thereof is connected on primary cooling water inlet plenum 108 with fluid mode of communicating, and another one end is connected on primary cooling water output chamber 109 with fluid mode of communicating, described primary cooling water enters chamber 108 and is communicated with reactor heat pipe section by primary cooling water entrance 110, and described primary cooling water output chamber 109 exports 111 by primary cooling water and is communicated with reactor cold leg.A plurality of centrifugal steam purifiers 102 are arranged on the top of steam generator shell 101 inner sides, are positioned at the top of tube bank 107, are especially arranged in the surface of the secondary cooling water that is contained in steam generator shell 101.An exsiccator 103 is arranged on the top of steam-water separator 102, has applied waveform carbonated drink separating plate of the present invention on this exsiccator 103.
The primary cooling water of high temperature is fed into primary cooling water and enters in chamber 108, and this primary cooling water is heated by reactor core in nuclear reactor.Primary cooling water enters chamber 108 from primary cooling water and flows to primary cooling water output chamber 109 by restraining 107.On the contrary, secondary cooling water is by secondary cooling water entrance 106 and be imported into the surrounding of the interior tube bank 107 of steam generator shell 101 to water ring 105, and wherein, secondary cooling water entrance 106 is arranged on steam generator shell 101.At primary cooling water, flow through in the process of tube bank 107, by carrying out heat interchange with primary cooling water, the secondary cooling water being contained in steam generator shell 101 is heated.Thus, by secondary cooling water, produce steam.
In Fig. 2, can find out that the case side adapter 2 that is arranged on described secondary cooling water entrance 106 is connected by stepped appearance feed pipe 3 to water ring 105 with steam generator is interior, described stepped appearance feed pipe 3 comprises stepped appearance convergent pipeline section and the stepped appearance flaring pipeline section that integral type connects, described stepped appearance convergent pipeline section Large Diameter Pipeline end is connected with described cooling water inlet 106, described stepped appearance flaring pipeline section Large Diameter Pipeline end is communicated with the described water ring 105 of giving, and the pipe with small pipe diameter end of described stepped appearance convergent pipeline section is connected with the pipe with small pipe diameter end integral type of described stepped appearance flaring pipeline section; Should be to being provided with several reversed J shape pipes on water ring 105;
Described stepped appearance convergent pipeline section comprises the convergent classification pipeline section that several diameters reduce gradually, and the shrinkage ratio of adjacent two convergent classification pipeline section internal diameters is 1:0.85;
Described stepped appearance flaring pipeline section comprises the flaring classification pipeline section that several diameters expand gradually, and the expansion of adjacent two flaring classification pipeline section internal diameters is than being 1:0.85;
Between described adjacent two convergent classification pipeline sections, all have transition circular cone chamfering between adjacent two flaring classification pipeline sections, this transition circular cone chamfering is 86 °;
The feed pipe that is positioned at the level of steam generator shell 101 inner sides is designed to multistage stepped appearance convergent-increaser, is followed successively by from steam generator shell 101 to first order stepped appearance convergent pipeline section 301, second level stepped appearance convergent pipeline section 302, third level stepped appearance convergent pipeline section 303 to water ring 105; And first order stepped appearance flaring pipeline section 304, second level stepped appearance flaring pipeline section 305, third level stepped appearance flaring pipeline section 306, first order stepped appearance convergent pipeline section 301 is taken over 2 with case side and is connected, and third level stepped appearance flaring pipeline section 306 is connected with the threeway 4 of feeding water.Such structure relies on contracting, expands runner, has improved velocity in pipes, strengthens cold fluid and hot fluid and mixes, and has extenuated the thermal stratification feeding water in endless tube under low power run operating mode.
Claims (4)
1. the stepped appearance steam generator feed pipe that can effectively extenuate thermal stratification, be arranged on described steam generator secondary cooling water entrance and steam generator between water ring, it is characterized in that: comprise stepped appearance convergent pipeline section and stepped appearance flaring pipeline section that integral type connects, described stepped appearance convergent pipeline section Large Diameter Pipeline end is communicated with described cooling water inlet, described stepped appearance flaring pipeline section Large Diameter Pipeline end is communicated with to water ring with described, and the pipe with small pipe diameter end of described stepped appearance convergent pipeline section is connected with the pipe with small pipe diameter end integral type of described stepped appearance flaring pipeline section.
2. according to stepped appearance steam generator feed pipe claimed in claim 1, it is characterized in that: described stepped appearance convergent pipeline section comprises the convergent classification pipeline section that several diameters reduce gradually, the shrinkage ratio of adjacent two convergent classification pipeline section internal diameters is 1:0.85.
3. according to stepped appearance steam generator feed pipe claimed in claim 2, it is characterized in that: described stepped appearance flaring pipeline section comprises the flaring classification pipeline section that several diameters expand gradually, the expansion of adjacent two flaring classification pipeline section internal diameters is than being 1:0.85.
4. according to stepped appearance steam generator feed pipe claimed in claim 1, it is characterized in that: between described adjacent two convergent classification pipeline sections, all have transition circular cone chamfering between adjacent two flaring classification pipeline sections, this transition circular cone chamfering is 86 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320434955.9U CN203465955U (en) | 2013-07-22 | 2013-07-22 | Stepped steam-generator water feeding pipe capable of reducing phenomenon of thermal stratification effectively |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320434955.9U CN203465955U (en) | 2013-07-22 | 2013-07-22 | Stepped steam-generator water feeding pipe capable of reducing phenomenon of thermal stratification effectively |
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| Publication Number | Publication Date |
|---|---|
| CN203465955U true CN203465955U (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320434955.9U Expired - Lifetime CN203465955U (en) | 2013-07-22 | 2013-07-22 | Stepped steam-generator water feeding pipe capable of reducing phenomenon of thermal stratification effectively |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109798510A (en) * | 2019-01-11 | 2019-05-24 | 中广核工程有限公司 | A kind of main feed water pipe device for pressurized water reactor nuclear power station steam generator |
-
2013
- 2013-07-22 CN CN201320434955.9U patent/CN203465955U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109798510A (en) * | 2019-01-11 | 2019-05-24 | 中广核工程有限公司 | A kind of main feed water pipe device for pressurized water reactor nuclear power station steam generator |
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Granted publication date: 20140305 |