CN113237044A - Asymmetric inverted U-shaped tube bundle steam generator for reactor - Google Patents
Asymmetric inverted U-shaped tube bundle steam generator for reactor Download PDFInfo
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- CN113237044A CN113237044A CN202110663699.XA CN202110663699A CN113237044A CN 113237044 A CN113237044 A CN 113237044A CN 202110663699 A CN202110663699 A CN 202110663699A CN 113237044 A CN113237044 A CN 113237044A
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- 239000012530 fluid Substances 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 description 9
- 230000005484 gravity Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a reactor asymmetric inverted U-shaped tube bundle steam generator, which comprises an inlet chamber and an outlet chamber, wherein the top of the inlet chamber is provided with an inlet chamber connecting pipe, one side of the outlet chamber is provided with an outlet chamber connecting pipe, the inlet chamber connecting pipe and the outlet chamber connecting pipe are communicated through an asymmetric inverted U-shaped tube bundle, the outside of the asymmetric inverted U-shaped tube bundle is provided with a cooling device, the cooling device is used for cooling hot fluid in the asymmetric inverted U-shaped tube bundle, the asymmetric inverted U-shaped tube bundle consists of a first pipeline and a second pipeline, the first pipeline and the second pipeline have the same inner and outer diameters and inlet and outlet resistances, the lengths of the first pipeline and the second pipeline are different, the first pipeline and the second pipeline are in the same shape and are positioned on the same vertical plane, the two ends of the first pipeline and the second pipeline are respectively positioned on the same horizontal plane, after the asymmetric inverted U-shaped tube bundle is adopted, the height difference of a loop cold source and heat source can be increased, and after the asymmetric inverted U-shaped tube bundle is adopted, the range of the negative slope area of the flow-pressure drop curve is reduced, and the backflow phenomenon is reduced.
Description
Technical Field
The invention relates to the technical field of reactor steam generators, in particular to an asymmetric inverted U-shaped tube bundle steam generator of a reactor.
Background
Nuclear power plants can rely on natural circulation to remove the heat generated by the reactor during normal operation or during accident conditions, which is critical to maintaining reactor safety. However, compared with forced circulation, natural circulation driving force is relatively small, and system parameter coupling is strong, so that the conventional vertical U-shaped tube steam generator of the reactor is easy to generate flow instability phenomenon, particularly backflow phenomenon under the working condition of natural circulation. In the natural circulation working condition, the backflow phenomenon can occur in the U-shaped pipe of the steam generator part, so that the primary loop coolant with lower temperature in the outlet chamber flows back to the inlet chamber. The effective heat transfer area of the steam generator is reduced due to the occurrence of backflow, backflow fluid is mixed and dissipated with incoming flow of a hot section in an inlet chamber in a complex mode, the flow resistance coefficient of the steam generator under the natural circulation condition is strong, the circulation working condition is increased by multiple times, the natural circulation flow of the system is lower than the design value, the reactor is safe to operate, great risk exists, and the safety of the reactor is greatly challenged. For a nuclear power device for a ship, the operating environment is complex and changeable, the working condition changes frequently, and particularly, the operating parameters of fluid in a U-shaped pipe can change in the process of converting forced circulation into natural circulation. The backflow phenomenon not only greatly reduces the natural circulation capacity of a loop system, but also mutually couples and influences the flow and heat transfer of fluid on the secondary side of the steam generator, and brings great challenges to the safety of the reactor. The existing method for solving the backflow of the steam generator mainly starts from the angle of operation parameters, and can effectively reduce backflow critical flow and critical pressure drop, so that the steam generator is enabled to operate in a backflow-avoiding region by connecting U-shaped tube bundles in parallel, but the backflow problem cannot be fundamentally solved.
Disclosure of Invention
In order to make up for the defects, the invention provides the asymmetric inverted U-shaped tube bundle steam generator for the reactor, which has the functions of increasing the height difference of a cold source and a heat source of a loop, reducing the range of a negative slope region of a flow-pressure drop curve and relieving the occurrence of a backflow phenomenon.
The invention is realized by the following steps:
the asymmetric inverted U-shaped tube bundle steam generator comprises an inlet cavity and an outlet cavity, wherein an inlet cavity connecting pipe is arranged at the top of the inlet cavity, an outlet cavity connecting pipe is arranged on one side of the outlet cavity, the inlet cavity connecting pipe and the outlet cavity connecting pipe are communicated through the asymmetric inverted U-shaped tube bundle, a cooling device is arranged outside the asymmetric inverted U-shaped tube bundle and used for cooling hot fluid in the asymmetric inverted U-shaped tube bundle, the asymmetric inverted U-shaped tube bundle is composed of a first pipeline and a second pipeline, the first pipeline and the second pipeline are identical in length, and the first pipeline and the second pipeline are different in length.
Furthermore, the first pipeline and the second pipeline are matched in shape and are positioned on the same vertical plane, and two ends of the first pipeline and two ends of the second pipeline are respectively positioned on the same horizontal plane.
Further, an inlet tube plate is arranged at the top of the inlet chamber and is a semicircular plate, and the inlet tube plate is used for installing an inlet chamber connecting tube.
Furthermore, an outlet tube plate is arranged on one side of the outlet chamber and is a rectangular plate, and the outlet tube plate is used for installing the outlet chamber connecting tube.
Further, the outlet chamber is located at a bottom position of the inlet chamber.
Further, the cooling device is a secondary side fluid pipe, and the secondary side fluid is used for cooling the hot fluid in the asymmetric inverted U-shaped tube bundle through the secondary side fluid.
The invention has the beneficial effects that:
after the asymmetrical inverted U-shaped tube bundle is adopted, the height difference of a cold source and a heat source of a loop can be increased, and the range of a negative slope area of a flow-pressure drop curve is reduced and the backflow phenomenon is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of an asymmetric inverted U-shaped tube bundle structure according to the present invention;
FIG. 2 is a graph showing the variation of total pressure drop of an inlet and an outlet with flow under a working condition;
FIG. 3 is a graph showing the variation of total pressure drop along with flow rate at two inlet and outlet under working conditions.
FIG. 4 is a graph showing the variation of total pressure drop with flow rate in the three inlets and outlets under three operating conditions.
FIG. 5 is a graph showing the variation of total pressure drop along with flow rate in four inlet and outlet under four operating conditions.
In the figure: 100. an asymmetric inverted U-shaped tube bundle; 101. a first pipeline; 102. a second pipeline; 200. an inlet chamber; 201. an inlet tube sheet; 202. an inlet chamber connection; 300. an outlet chamber; 301. an outlet tube sheet; 302. an outlet chamber connection; 400. and a cooling device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1-5, the present invention provides the following technical solutions: reactor asymmetric inverted U-shaped tube bundle steam generator, including inlet chamber 200 and export chamber 300, the top of inlet chamber 200 is provided with inlet chamber takeover 202, one side of export chamber 300 is provided with export chamber takeover 302, inlet chamber takeover 202 and export chamber takeover 302 are through asymmetric inverted U-shaped tube bundle intercommunication, the outside of asymmetric inverted U-shaped tube bundle is provided with cooling device 400, cooling device 400 is used for cooling the interior hot-fluid of asymmetric inverted U-shaped tube bundle, asymmetric inverted U-shaped tube bundle comprises pipeline one 101 and pipeline two 102 of internal and external diameter, material, the import and export resistance unanimity, the length of pipeline one 101 is inequality with pipeline two 102.
Because the space of the cabin where the reactor of the marine nuclear power device is located is limited, the height of the steam generator is difficult to increase, the structural design of the asymmetric U-shaped pipe can obviously increase the height difference between the descending section and the ascending section of the asymmetric U-shaped pipe under the condition that the height of the steam generator is not changed, so that the gravity pressure drop of the asymmetric U-shaped pipe is increased, and the backflow phenomenon is slowed down.
For the asymmetric inverted U-shaped tube bundle, an ascending straight tube section is set to be HuThe descending straight pipe section is HdThen, then
The total gravity pressure drop is:
the expression of the gravity pressure drop of the ascending section minus the gravity pressure drop of the descending section is:
the bending section gravity pressure drop expression is as follows:
thus, formula (2) and formula (3) can be substituted for formula (1):
the total pressure drop is
By using the mathematical physical model of the asymmetric U-shaped pipe 100, the operation and structural parameters of an inverted U-shaped pipe in a steam generator of a certain nuclear power plant are taken as calculation objects, the height difference between a descending section and an ascending section is increased, the improvement effect of the asymmetric U-shaped pipe is calculated and analyzed from the two aspects of backflow critical mass flow and backflow critical pressure drop, the U-shaped pipe with the length of L is selected, the total pipe length is kept unchanged, three improvement schemes that the height difference between the descending section and the ascending section is increased to be 0.08L, 0.12L and 0.16L respectively are provided, and the calculation is carried out under the set working conditions 1, 2, 3 and 4. Working conditions 1 and 2 are natural circulation power operation working conditions, and working conditions 3 and 4 are secondary side passive waste heat removal working conditions. All data in table 1, table 2 and figures 2-5 were normalized.
TABLE 1 Steady-State calculation Condition List
Calculating the running conditions of the optimization schemes under different working conditions to obtain a change relation curve of total pressure drop of the inlet and the outlet along with the flow, making figures 2 to 5, and comparing the backflow critical mass flow of different optimization schemes under different working conditions with the flow ratio shown in table 2.
TABLE 2 critical flow of backflow under different conditions for different optimization schemes
Under the working condition of natural circulation, the flow-pressure drop curve has a negative slope region, when the fluid in the inverted U-shaped tube works in the negative slope region, the backflow phenomenon can occur, and the backflow phenomenon can be obviously weakened by reducing the flow range of the negative slope region. As can be seen from fig. 1-4 and table 2, under the same working condition, the backflow critical flow rate gradually decreases with the increase of the height difference between the descending section and the ascending section, which means that the range of the negative slope region of the flow-pressure drop curve is obviously reduced, and the absolute value of the backflow critical pressure drop gradually increases, indicating that the backflow phenomenon is more difficult to occur in the asymmetric U-shaped pipe than in the symmetric U-shaped pipe under the natural circulation power operating condition and the secondary side passive waste heat discharging condition, and the increase of the height difference between the descending section and the ascending section can obviously and slowly reduce the backflow phenomenon.
The inner and outer diameters, materials and inlet and outlet resistances of the asymmetric U-shaped tube bundle 100 are completely consistent with those of the original inverted U-shaped tube, and the length of the ascending straight tube section is HuThe length of the descending straight segment is HdThat is, the sum of the two sections is the same as the length of the original inverted U-shaped pipe, and in order to increase the height difference between the descending section and the ascending section, the outlet chamber 300 is placed at the inletUnder the chamber 200, in normal operation, hot fluid flowing out of the reactor core enters the inlet chamber from the inlet chamber connecting pipe 202, then flows through the asymmetric inverted U-shaped tube bundle 100, and after heat transfer cooling is performed on the fluid and secondary side fluid outside the tube, the cooled fluid flows downwards into the outlet chamber 300, and then flows out of the outlet chamber 300, and flows into the core through a pipeline to absorb heat generated by the core, so that circular flow is formed.
To meet the amount of fluid charge in the steam generator, the volume of the inlet and outlet chambers 200, 300 is guaranteed to be the same as the volume of the prototype steam generator inlet and outlet chambers 200, 300.
The first pipeline 101 and the second pipeline 102 are matched in shape and are located on the same vertical plane, and two ends of the first pipeline 101 and two ends of the second pipeline 102 are located on the same horizontal plane respectively.
The top of the inlet chamber 200 is provided with an inlet tube plate 201, the inlet tube plate 201 is a semicircular plate, and the inlet tube plate 201 is used for installing an inlet chamber connecting tube 202.
An outlet tube plate 301 is arranged on one side of the outlet chamber 300, the outlet tube plate 301 is a rectangular plate, and the outlet tube plate 301 is used for installing an outlet chamber connecting tube 302.
The outlet chamber 300 is located at the bottom position of the inlet chamber 200.
The cooling device 400 is a secondary side fluid pipe, and the secondary side fluid is used for cooling the thermal fluid in the asymmetric inverted U-shaped tube bundle through the secondary side fluid.
When the asymmetric inverted U-shaped tube bundle steam generator of the reactor normally operates, hot fluid flowing out of a reactor core of the reactor enters an inlet chamber from an inlet chamber connecting pipe 202, then flows through the asymmetric inverted U-shaped tube bundle 100, and after heat transfer cooling is carried out on the fluid and fluid on the secondary side outside the tube, the cooled fluid flows downwards into an outlet chamber 300, flows out of the outlet chamber 300, flows into the reactor core through a pipeline, absorbs heat generated by the reactor core, and forms circular flow.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. Asymmetric inverted U-shaped tube bundle steam generator of reactor, its characterized in that: the asymmetric inverted U-shaped tube bundle cooling device comprises an inlet chamber (200) and an outlet chamber (300), wherein an inlet chamber connecting tube (202) is arranged at the top of the inlet chamber (200), an outlet chamber connecting tube (302) is arranged on one side of the outlet chamber (300), the inlet chamber connecting tube (202) is communicated with the outlet chamber connecting tube (302) through the asymmetric inverted U-shaped tube bundle (100), a cooling device (400) is arranged outside the asymmetric inverted U-shaped tube bundle (100), the cooling device (400) is used for cooling hot fluid in the asymmetric inverted U-shaped tube bundle (100), the asymmetric inverted U-shaped tube bundle (100) is composed of a first pipeline (101) and a second pipeline (102) which are consistent in inner and outer diameter, material and inlet and outlet resistance, and the first pipeline (101) is different from the second pipeline (102) in length.
2. The asymmetric inverted U-shaped tube bundle steam generator of claim 1, wherein: the first pipeline (101) and the second pipeline (102) are matched in shape and are positioned on the same vertical plane, and two ends of the first pipeline (101) and two ends of the second pipeline (102) are respectively positioned on the same horizontal plane.
3. The asymmetric inverted U-shaped tube bundle steam generator of claim 1, wherein: the top of the inlet chamber (200) is provided with an inlet tube plate (201), the inlet tube plate (201) is a semicircular plate, and the inlet tube plate (201) is used for installing an inlet chamber connecting tube (202).
4. The asymmetric inverted U-shaped tube bundle steam generator of claim 1, wherein: an outlet tube plate (301) is arranged on one side of the outlet chamber (300), the outlet tube plate (301) is a rectangular plate, and the outlet tube plate (301) is used for installing an outlet chamber connecting tube (302).
5. The asymmetric inverted U-shaped tube bundle steam generator of claim 1, wherein: the outlet chamber (300) is located at a bottom position of the inlet chamber (200).
6. The asymmetric inverted U-shaped tube bundle steam generator of claim 1, wherein: the cooling device (400) is a secondary side fluid pipe, and the secondary side fluid is used for cooling hot fluid in the asymmetric inverted U-shaped tube bundle (100) through the secondary side fluid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110663699.XA CN113237044A (en) | 2021-06-16 | 2021-06-16 | Asymmetric inverted U-shaped tube bundle steam generator for reactor |
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| CN202110663699.XA CN113237044A (en) | 2021-06-16 | 2021-06-16 | Asymmetric inverted U-shaped tube bundle steam generator for reactor |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1432663A (en) * | 1972-04-07 | 1976-04-22 | Sulzer Ag | Nuclear reactor plants including evaporators |
| JP2012122630A (en) * | 2010-12-06 | 2012-06-28 | Toshiba Corp | Steam generator |
| KR101171052B1 (en) * | 2012-04-20 | 2012-08-03 | 장용승 | Hydroelectric power generator for nucler energy statin |
| CN202948737U (en) * | 2012-10-22 | 2013-05-22 | 中国核动力研究设计院 | Passive residual heat removal system directly connected with main loop |
| CN108447570A (en) * | 2018-05-15 | 2018-08-24 | 中广核研究院有限公司 | Naval reactor and its Passive residual heat removal system |
| CN108447569A (en) * | 2018-03-09 | 2018-08-24 | 中国核动力研究设计院 | A kind of primary side of steam generator structure for alleviating U-tube refluence |
| CN108800094A (en) * | 2018-05-03 | 2018-11-13 | 中广核研究院有限公司 | A kind of steam generator for metal fast reactor |
| CN217154137U (en) * | 2021-06-16 | 2022-08-09 | 中国人民解放军海军工程大学 | Asymmetric inverted U-shaped tube bundle steam generator for reactor |
-
2021
- 2021-06-16 CN CN202110663699.XA patent/CN113237044A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1432663A (en) * | 1972-04-07 | 1976-04-22 | Sulzer Ag | Nuclear reactor plants including evaporators |
| JP2012122630A (en) * | 2010-12-06 | 2012-06-28 | Toshiba Corp | Steam generator |
| KR101171052B1 (en) * | 2012-04-20 | 2012-08-03 | 장용승 | Hydroelectric power generator for nucler energy statin |
| CN202948737U (en) * | 2012-10-22 | 2013-05-22 | 中国核动力研究设计院 | Passive residual heat removal system directly connected with main loop |
| CN108447569A (en) * | 2018-03-09 | 2018-08-24 | 中国核动力研究设计院 | A kind of primary side of steam generator structure for alleviating U-tube refluence |
| CN108800094A (en) * | 2018-05-03 | 2018-11-13 | 中广核研究院有限公司 | A kind of steam generator for metal fast reactor |
| CN108447570A (en) * | 2018-05-15 | 2018-08-24 | 中广核研究院有限公司 | Naval reactor and its Passive residual heat removal system |
| CN217154137U (en) * | 2021-06-16 | 2022-08-09 | 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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