CN203534310U - Spiral flow type and anti-deposition inverted U-shaped tube - Google Patents
Spiral flow type and anti-deposition inverted U-shaped tube Download PDFInfo
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- CN203534310U CN203534310U CN201320455701.5U CN201320455701U CN203534310U CN 203534310 U CN203534310 U CN 203534310U CN 201320455701 U CN201320455701 U CN 201320455701U CN 203534310 U CN203534310 U CN 203534310U
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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 provides a spiral flow type and anti-deposition inverted U-shaped tube for a steam generator. The spiral flow type and anti-deposition inverted U-shaped tube comprises a cylindrical inverted U-shaped tube wall and a spiral baffle plate arranged therein, wherein the helicoid of the spiral baffle plate is perpendicular to the center line of the inverted U-shaped tube, the length of the helicoids is the linear section of the diameter of the inverted U-shaped tube to move spirally, the outer rim of the spiral baffle plate is attached to the inner wall of the inverted U-shaped tube, and the helix angle of the spiral baffle plate is 20-50 degrees. Since the spiral baffle plate is added, linear flow of the fluid is changed into continuous sprial flow, so that fluid flushes a heat-transfer tube in a spiral flow. Deposition of particles on the tube wall can be prevented. The inverted U-shaped tube is simple in structure and convenient for dismounting, and the economical efficiency, safety and reliability of the U-shaped tube of the steam generator are effectively improved.
Description
Technical field
The utility model relates to plant equipment and nuclear energy field, relates to the anti-settling long-pending inverted U pipe of spiral streaming for steam generator.
Background technology
Nuclear power station is the power plant that utilizes the power generation electric energy that nuclear fission or nuclear fusion reaction discharge.It is comprised of the inside of nuclear power station a circuit system and secondary coolant circuit system conventionally.Reactor is the core of nuclear power station.The heat energy of emitting during reactor work, is taken out of by the cooling agent of a circuit system, in order to produce steam.Therefore, a whole circuit system is called as " core steam-supplying system ", and it is equivalent to the steam generator system of thermal power plant.The secondary coolant circuit system being generated electricity by steam drive Turbo-generator Set, basic identical with the steam turbine generator system of thermal power plant.
Since nuclear power station comes out, at the power generation stack of industrial maturation, following three kinds have been mainly contained: light water reactor, PHWR and graphite vapour cold dome.They are correspondingly used in three kinds of different nuclear power stations, have formed the main body of modern nuclear power generation.
At present, the great majority in thermal-neutron reactor are with light-water slowing down and cooling so-called light water reactor.Light water reactor is divided into again presurized water reactor and boiling-water reactor.Now take the effect of presurized water reactor as example explanation steam generator.
One circuit system and the secondary coolant circuit system of pressurized-water reactor nuclear power plant separate completely, and it is an airtight circulatory system.The principle process of this nuclear power station is: main pump is sent pressure coolant into reactor, and general cooling agent remains on 120～160 atmospheric pressure.Under high-pressure situations, even if the temperature of cooling agent can not vaporized more than 300 ℃ yet.The heat energy that cooling agent is emitted nuclear fuel is taken reactor out of, and enters steam generator, by thousands of heat-transfer pipes, heat is passed to the secondary circuit water outside pipe, makes water boiling produce steam; Coolant flow, after steam generator, then is sent into reactor by main pump, and reciprocation cycle, constantly takes and change generation steam out of the heat in reactor like this.From steam generator high temperature and high pressure steam out, promote Turbo-generator Set generating.The waste vapour of doing merit condenses into water in condenser, then sends into heater by the feed pump that condenses, and after reheating, sends steam generator back to.The secondary circuit circulatory system that Here it is.
As can be seen here, steam generator be connect one, the visual plant of secondary circuit, be called as one, the hinge of secondary circuit.Can steam generator move safely, reliably has very important impact to the economy of whole nuclear power unit and security reliability.Heat-transfer pipe in so-called steam generator is the inverted U tube bank of proper alignment, inverted U tube bank is the most important heat-exchanging component of steam generator, the high temperature coolant being flowed out by reactor core carries out flowing back to reactor core after heat exchange via inverted U tube bank and the water outside pipe again, constantly move in circles, carry out heat transmission, the quality of inverted U tube bank exchange capability of heat has determined the size of steam generator exchange capability of heat.
Yet when reactor operation, because the corrosion that the parts such as fuel rod, in-pile component can be subject to high pressure to cross cold-coolant is washed away, denuded-accelerated corrosion of burn into FAC(pipeline fluid) impact of effect, can produce many tiny particles.These particles can enter steam generator with cooling agent, are attached on inverted U inside pipe wall, are equivalent to increase one deck heat transfer resistance in diabatic process, reduce heat transfer efficiency, have affected the economy of nuclear power unit.Again because adhering to of particle causes the assignment of traffic of cooling agent in inverted U pipe unbalanced, cause tube bundle vibration simultaneously, in severe situation, can affect security and the reliability of nuclear power unit.
At present domestic main anti-deposition measure mainly contains mechanical type, energized, pocket type, wet type etc.But because inverted U tube wall is thin, caliber is little, all restricted to the enforcement of above-mentioned measure, at present domestic large nuclear power station as in Qinshan second phase nuclear power station, Daya Bay nuclear power plant and ridge nuclear power station difficult to understand to the particle in the cooling agent of the inverted U pipe of flowing through all without good anti-deposition effect.
At present, not yet have the inverted U tubular construction as core component is carried out to improved report, this is because inverted U tube wall is thin, caliber is little, and anti-depositional mode is had to further restriction.
If to by inverted U tubular construction being carried out to appropriate design and selecting suitable material, may develop the inverted U pipe with good anti-deposition effect, to obtain better economy and security reliability.
Utility model content
In order to solve the adhering to and the problem that security reliability reduces and nuclear power unit economy declines that causes in inverted U pipe of particle in a circuit system, the inventor has carried out research with keen determination, found that: by helical baffles being set in inverted U pipe, one circuit cools agent is produced to good guide effect, change the type of flow of a circuit cools agent, by streamlined flow, becoming continuous helical form flows, because the circuit cools agent in heat exchanger traverse baffle shell side is screw type plunger flow mode, at shell side cross section, radially produce velocity gradient, because every inverted U heat exchange tube in steam generator is all placed in the vortex as a circuit cools agent of heat transferring medium, the fluid that has improved a circuit cools agent is turbulent extent radially, be conducive to wash away particle and sediment in shell side, effectively prevent that particle is deposited on inverted U tube wall, thereby complete the utility model.
The purpose of this utility model is to provide following technical scheme.
First aspect, the utility model provides the anti-settling long-pending inverted U pipe of spiral streaming for steam generator, it is characterized in that: this inverted U pipe comprises: tubular inverted U tube wall and the inner helical baffles arranging thereof,
Wherein, the helicoid of helical baffles forms by doing following screw with inverted U tube hub line perpendicular quadrature, its length straightway that is inverted U pipe radius: described straight line is when making constant speed movement along described inverted U tube hub line direction, around described inverted U tube hub line, do rotatablely moving of isogonism speed again
That is, the helicoid of helical baffles is Archimedes' helicoid, and the outward flange of helical baffles and inverted U inside pipe wall join, and the helical angle of helical baffles is 20 °-50 °,
Wherein, the one circuit cools agent of inverted U pipe internal circulation, inverted U pipe flows through secondary circuit cooling agent outward.
Second aspect, the utility model provides the anti-settling long-pending inverted U pipe of spiral streaming for above-mentioned steam generator, it is characterized in that, and the helical angle of helical baffles is 30 °-40 °.
The third aspect, the utility model provides the anti-settling long-pending inverted U pipe of spiral streaming for above-mentioned steam generator, it is characterized in that, and described inverted U tube wall and helical baffles are made by inconel alloy.
Fourth aspect, the utility model provides the anti-settling long-pending inverted U pipe of spiral streaming for above-mentioned steam generator, it is characterized in that, and described inverted U tube wall and helical baffles are made by inconel690 alloy.
The 5th aspect, the utility model provides the anti-settling long-pending inverted U pipe of spiral streaming for above-mentioned steam generator, it is characterized in that, and the thickness of helical baffles is 1mm-1.5mm.
The 6th aspect, the utility model provides the anti-settling long-pending inverted U pipe of spiral streaming for above-mentioned steam generator, it is characterized in that, and the thickness of helical baffles is about 1.2mm.
The 7th aspect, the utility model provides the anti-settling long-pending inverted U pipe of spiral streaming for above-mentioned steam generator, it is characterized in that, and inverted U pipe external diameter is 17mm-22mm, and the external diameter of inverted U tube wall is that wall thickness is 1mm-2mm.
The steam generator providing according to the utility model has the following advantages with the anti-settling long-pending inverted U pipe of spiral streaming:
(1) helical baffles has good guide effect to a circuit cools agent, change the type of flow of cooling agent, by streamlined flow, becoming continuous helical form flows, because the medium in heat exchanger shell pass is screw type plunger flow mode, at shell side cross section, radially produce velocity gradient, every heat exchanger tube is all placed in to heat transferring medium vortex, improved the radially turbulent extent of fluid, be conducive to wash away particle and sediment in shell side, prevent that particle is deposited on tube wall, thereby guarantee that heat transfer efficiency and coolant flux distribution are balanced, increase economy and the security of nuclear power unit.
(2) steam generator providing according to the utility model can effectively be avoided the deficiency of traditional anti-deposition measure with the anti-settling long-pending inverted U pipe of spiral streaming, and the inverted U pipe thin to tube wall, caliber is little is applicable equally.
(3) steam generator providing according to the utility model is simple by the anti-settling long-pending inverted U pipe production technology of spiral streaming, without exterior power, workable.
(4) steam generator providing according to the utility model is simple with the anti-settling long-pending inverted U tubular construction of spiral streaming, easy accessibility.
Accompanying drawing explanation
Fig. 1 illustrates the inverted U pipe overall structure schematic diagram according to the utility model preferred embodiment;
The steam generator that Fig. 2 provides according to the utility model blocks schematic diagram with the anti-settling long-pending inverted U pipe inverted U pipe of spiral streaming;
The steam generator that Fig. 3 provides according to the utility model blocks profile with the anti-settling long-pending inverted U pipe inverted U pipe of spiral streaming.
The specific embodiment
Below by the utility model is elaborated, feature of the present utility model and advantage will become more clear, clear and definite along with these explanations.
Here special-purpose word " exemplary " means " as example, embodiment or illustrative ".Here as " exemplary " illustrated any embodiment, needn't be interpreted as being better than or being better than other embodiment.Although the various aspects of embodiment shown in the drawings, unless otherwise indicated, needn't draw accompanying drawing in proportion.
According in a preferred embodiment of the present utility model, as shown in Fig. 1-3, the anti-settling long-pending inverted U pipe of spiral streaming for steam generator is provided, comprises tubular inverted U tube wall 1 and the inner helical baffles 2 arranging thereof, the helicoid of helical baffles 2 is Archimedes' helicoid.
In this article, the helicoid that term used " Archimedes' helicoid " refers to helical baffles forms by doing following screw with inverted U tube hub line perpendicular quadrature, its length straightway that is inverted U pipe radius.
In this article, term used " screw " refer to inverted U tube hub line perpendicular quadrature, its length be the straightway of inverted U pipe radius when making constant speed movement along described inverted U tube hub line direction, around described inverted U tube hub line, do rotatablely moving of isogonism speed again.
In this article, term used " radial dimension of helical baffles " refers to the length of the straightway of the motion of spinning.
According to steam generator of the present utility model, using in the anti-settling long-pending inverted U pipe of spiral streaming, the tube wall 1 of described inverted U pipe is the heat transfer interface of a circuit cools agent and secondary circuit cooling agent in nuclear power reactor, circulation one circuit cools agent in inverted U pipe, the inverted U pipe secondary circuit cooling agent that circulates outward.Wherein, a circuit cools agent is passed to inverted U tube wall face inner side by heat convection by heat, then through the heat conduction in tube wall, passes to wall outside, finally by heat convection, heat is passed to secondary circuit cooling agent.
According to steam generator of the present utility model, using in the anti-settling long-pending inverted U pipe of spiral streaming, the outward flange of helical baffles 2 and inverted U inside pipe wall join, and the helical angle of helical baffles 2 is 20 °-50 °, is preferably 30 °-40 °.When the helical angle of helical baffles 2 is in above-mentioned scope, can effectively prevent that particle from depositing on inverted U pipe.When the helical angle of helical baffles 2 is greater than 50 °, because the helical form as a circuit cools agent of flow media wherein flows not strong, prevent that particle deposition effect is deteriorated, otherwise, when the helical angle of helical baffles 2 is less than 20 °, because helical flow path is long, not enough as the velocity gradient of a circuit cools agent of flow media, cause preventing that particle deposition effect is not enough.
Especially, when the helical angle of helical baffles 2 is 30 °-40 °, can obtain very excellent anti-deposition effect.
Fig. 2 is part see-through section enlarged drawing in Fig. 1, and as shown in Figure 2, a circuit cools agent is flow through inverted U pipe along the helical baffles rising (or decline) of spiraling.One circuit cools agent is washed away inverted U inside pipe wall in the mode of spiral flow, prevents that particle from depositing at tube wall.Thereby reduced the heat transfer resistance being formed by particle, and then improved heat transfer property.In addition, smooth U-shaped inside pipe wall makes coolant flux distribution be tending towards balanced, thereby has increased security, the reliability of nuclear power unit.
According to steam generator of the present utility model, using in the anti-settling long-pending inverted U pipe of spiral streaming, the utility model people find after deliberation, inverted U tube wall 1 is preferably made by inconel alloy with helical baffles 2, particularly preferably by inconel690 alloy, made, this alloy has non-oxidizability in significant oxidation resistance and high-temperature oxygen.
Using in the anti-settling long-pending inverted U pipe of spiral streaming according to steam generator of the present utility model, in order to ensure anti-deposition effect, guarantee heat transfer efficiency simultaneously, the thickness of helical baffles 2 is preferably 1mm-1.5mm, more preferably about 1.2mm.When the thickness of helical baffles is within the scope of this, can improve heat transfer efficiency and anti-deposition effect on the one hand, can guarantee its service life on the other hand.
According to steam generator of the present utility model, using in the anti-settling long-pending inverted U pipe of spiral streaming, in order to ensure heat transfer efficiency, in preferred embodiments, inverted U pipe external diameter is 17mm-22mm, preferred 18-20mm, the external diameter of inverted U tube wall is that wall thickness is 1mm-2mm, preferred about 1.5mm.
embodiment
By instantiation, further describe the utility model below.
Embodiment 1
As Figure 1-3, produce the anti-settling long-pending inverted U pipe of spiral streaming for steam generator, wherein tube wall and helical baffles are made by inconel690 alloy, thickness of pipe wall 1.5mm, inverted U pipe external diameter is 20mm, the helicoid of helical baffles is archimedes right helicoids, thickness is 1.2mm, helical angle is 35 °, and the radial dimension of helical baffles is identical with inverted U bore, and outer rim and the tube wall of helical baffles join.
Compare with the U-shaped pipe that does not add helical baffles, anti-deposition effect promoting 10%, heat-transfer effect promotes 10%.
Embodiment 2
Produce the anti-settling long-pending inverted U pipe of spiral streaming for steam generator similar to Example 1, thickness of pipe wall 1mm wherein, inverted U pipe external diameter is 17mm, and spiral baffling plate thickness is 1mm, and helical angle is 50 °.
Compare with the U-shaped pipe that does not add helical baffles, anti-deposition effect promoting 15%, heat-transfer effect promotes 15%.
Embodiment 3
Produce the anti-settling long-pending inverted U pipe of spiral streaming for steam generator similar to Example 1, thickness of pipe wall 1.5mm wherein, inverted U pipe external diameter is 20mm, and spiral baffling plate thickness is 1.5mm, and helical angle is 70 °.
Compare with the U-shaped pipe that does not add helical baffles, anti-deposition effect promoting 15%, heat-transfer effect promotes 17%.
Comparative example 1
Produce the anti-settling long-pending inverted U pipe of spiral streaming for steam generator similar to Example 1, difference is only that the helical angle of helical baffles is 70 °.
Compare with the U-shaped pipe that does not add helical baffles, anti-deposition effect promoting 5%, heat-transfer effect promotes 12%.
Comparative example 2
Produce the anti-settling long-pending inverted U pipe of spiral streaming for steam generator similar to Example 1, difference is only that the radial dimension of helical baffles is 12mm.
Compare with the U-shaped pipe that does not add helical baffles, anti-deposition effect promoting 8%, heat-transfer effect promotes 10%.
Comparative example 3
Produce the anti-settling long-pending inverted U pipe of spiral streaming for steam generator similar to Example 1, difference is only that the radial dimension of helical baffles is 7mm.
Compare with the U-shaped pipe that does not add helical baffles, anti-deposition effect promoting 7%, heat-transfer effect promotes 8%.
More than engage the specific embodiment and exemplary example has been described in detail the utility model, but these explanations can not be interpreted as to restriction of the present utility model.It will be appreciated by those skilled in the art that in the situation that not departing from the utility model spirit and scope, can carry out multiple replacement of equal value, modify or improve technical solutions of the utility model and embodiment thereof, these all fall in scope of the present utility model.Protection domain of the present utility model is as the criterion with claims.
Claims (7)
1. spiral streaming anti-settling long-pending inverted U pipe for steam generator, is characterized in that: this inverted U pipe comprises: tubular inverted U tube wall (1) and the inner helical baffles (2) arranging thereof,
Wherein, the helicoid of helical baffles (2) forms by doing following screw with inverted U tube hub line perpendicular quadrature, its length straightway that is inverted U pipe radius: described straight line is when making constant speed movement along described inverted U tube hub line direction, around described inverted U tube hub line, do rotatablely moving of isogonism speed again
That is, the helicoid of helical baffles (2) is Archimedes' helicoid, and outward flange and the inverted U inside pipe wall of helical baffles (2) join, and the helical angle of helical baffles (2) is 20 °-50 °,
Wherein, the one circuit cools agent of inverted U pipe internal circulation, inverted U pipe flows through secondary circuit cooling agent outward.
2. the anti-settling long-pending inverted U pipe of spiral streaming for steam generator according to claim 1, is characterized in that, the helical angle of helical baffles (2) is 30 °-40 °.
3. the anti-settling long-pending inverted U pipe of spiral streaming for steam generator according to claim 1, is characterized in that, described inverted U tube wall (1) is made by inconel alloy with helical baffles (2).
4. the anti-settling long-pending inverted U pipe of spiral streaming for steam generator according to claim 1, is characterized in that, described inverted U tube wall (1) is made by inconel690 alloy with helical baffles (2).
5. the anti-settling long-pending inverted U pipe of spiral streaming for steam generator according to claim 1, is characterized in that, the thickness of helical baffles (2) is 1mm-1.5mm.
6. the anti-settling long-pending inverted U pipe of spiral streaming for steam generator according to claim 1, is characterized in that, the thickness of helical baffles (2) is about 1.2mm.
7. the anti-settling long-pending inverted U pipe of spiral streaming for steam generator according to claim 1, is characterized in that, inverted U pipe external diameter is 17mm-22mm, and the external diameter of inverted U tube wall (1) is that wall thickness is 1mm-2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320455701.5U CN203534310U (en) | 2013-07-29 | 2013-07-29 | Spiral flow type and anti-deposition inverted U-shaped tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320455701.5U CN203534310U (en) | 2013-07-29 | 2013-07-29 | Spiral flow type and anti-deposition inverted U-shaped tube |
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| Publication Number | Publication Date |
|---|---|
| CN203534310U true CN203534310U (en) | 2014-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320455701.5U Withdrawn - After Issue CN203534310U (en) | 2013-07-29 | 2013-07-29 | Spiral flow type and anti-deposition inverted U-shaped tube |
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| Country | Link |
|---|---|
| CN (1) | CN203534310U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344758A (en) * | 2013-07-29 | 2015-02-11 | 华北电力大学 | Spiral flow type anti-deposition reverse U-shaped pipe |
| CN106875986A (en) * | 2017-03-22 | 2017-06-20 | 华北电力大学 | The anti-particulate matter precipitation equipment of reactor-loop under a kind of lead bismuth environment |
-
2013
- 2013-07-29 CN CN201320455701.5U patent/CN203534310U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344758A (en) * | 2013-07-29 | 2015-02-11 | 华北电力大学 | Spiral flow type anti-deposition reverse U-shaped pipe |
| CN106875986A (en) * | 2017-03-22 | 2017-06-20 | 华北电力大学 | The anti-particulate matter precipitation equipment of reactor-loop under a kind of lead bismuth environment |
| CN106875986B (en) * | 2017-03-22 | 2018-07-24 | 华北电力大学 | The anti-particulate matter precipitation equipment of reactor-loop under a kind of lead bismuth environment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140409 Effective date of abandoning: 20160406 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |