CN103286231B - Thick-wall nickel base alloy heat exchanging tube and nickel base alloy tube plate expanding-connecting technology - Google Patents
Thick-wall nickel base alloy heat exchanging tube and nickel base alloy tube plate expanding-connecting technology Download PDFInfo
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- CN103286231B CN103286231B CN201310237823.1A CN201310237823A CN103286231B CN 103286231 B CN103286231 B CN 103286231B CN 201310237823 A CN201310237823 A CN 201310237823A CN 103286231 B CN103286231 B CN 103286231B
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Abstract
The invention discloses a thick-wall nickel base alloy heat exchanging tube and nickel base alloy tube plate expanding-connecting technology. A nickel base alloy heat exchanging tube and a nickel base alloy tube plate are in expanding connection in an ultra-high-pressure-hydraulic mode to form an expanding connector of the nickel base alloy heat exchanging tube and the nickel base alloy tube plate. The nickel base alloy heat exchanging tube is made of Incoloy-800H nickel base alloy, the outer diameter of the nickel base alloy heat exchanging tube is 19.0-19.1mm, and the tube wall thickness of the nickel base alloy heat exchanging tube is 2.95-3.05mm. The nickel base alloy tube plate is made of Incoloy-800H nickel base alloy, the tube plate thickness is 300-320mm, and a tube plate hole bridge is 7-8mm. The expanding-connecting pressure of ultra-high-pressure-hydraulic expanding connecting is 300-350MPa, and pressure-maintaining time is 4-8s. Through intensity expanding connecting, the requirements for connector expanding-connecting intensity and sealing performance are met, and the requirements of a manufacturing technology process are met.
Description
Technical field
The present invention relates to the expanding joint method of exchanger tubes and tubesheets, particularly the expanding joint process of Ni-based heat exchanger tube and Ni-based tube sheet.
Background technology
The expansion joint of the exchanger tubes and tubesheets of heat exchanger mainly plays increases exchanger tubes and tubesheets bonding strength, bear axial load protection pipe and panel weld, eliminate the effect that exchanger tubes and tubesheets interporal lacuna prevents stress corrosion.The inefficacy of nuclear power station steam generator exchanger tubes and tubesheets expansion joint, will make primary side radiating medium permeate to secondary side, cause nuclear leakage.The quality of expansion joint then depends on expanding joint method and expanded joint parameter.
Presurized water reactor nuclear island heat exchanger heat-exchanging tube is generally Ni-based material, and tube sheet is steel forgings, adopts mechanical expanding or Hydraulic expansion-jointing.For certain reactor, because design and running temperature is higher, therefore steam side heat exchanger tube and tube sheet all adopt nickel-base material.
But, for the Ni-based heat exchanger tube that this high temperature heat transmission equipment is adopted and Ni-based tube sheet, the expanding joint process of the Ni-based heat exchanger tube that is suitable for of heat exchanger and steel tube sheet inapplicable in the past.
Summary of the invention
In order to solve the problem, present inventor has performed and study with keen determination, found that: for Ni-based heat exchanger tube and Ni-based tube sheet, by ultrahigh-pressure hydraulic expanded joint, at the expanding pressure of appropriateness with under the expanded joint time, can guarantee Ni-based heat exchanger tube and Ni-based tube sheet closely, expanded joint securely, thus complete the present invention.
The object of the present invention is to provide following aspect:
(1) expanding joint process for heavy wall nickel-base alloy heat exchanger tube and nickel-base alloy tube sheet, forms the expansion joint of nickel-base alloy heat exchanger tube and nickel-base alloy tube sheet by ultrahigh-pressure hydraulic expanded joint following nickel-base alloy heat exchanger tube and following nickel-base alloy tube sheet,
Wherein, described nickel-base alloy heat exchanger tube is made up of Incoloy-800H nickel-base alloy, and its external diameter is 19.0-19.1mm, and pipe thickness is 2.95-3.05mm,
Described nickel-base alloy tube sheet is made up of Incoloy-800H nickel-base alloy, and tube plate thickness is 300-320mm, and tube sheet bridge is 7-8mm,
The expanding pressure of described ultrahigh-pressure hydraulic expanded joint is 300-350MPa, and the dwell time is 4-8 second.
(2) expanding joint process of heavy wall nickel-base alloy heat exchanger tube as above and nickel-base alloy tube sheet, wherein, the caliber of described nickel-base alloy heat exchanger tube is 19.05mm, and pipe thickness is 3.00mm.
(3) expanding joint process of heavy wall nickel-base alloy heat exchanger tube as above and nickel-base alloy tube sheet, wherein, the tube plate thickness of described nickel-base alloy tube sheet is 310mm, and tube sheet bridge is 7.5-8mm.
(4) expanding joint process of heavy wall nickel-base alloy heat exchanger tube as above and nickel-base alloy tube sheet, wherein, the expanding pressure of described ultrahigh-pressure hydraulic expanded joint is 320-330MPa, and the dwell time is 4-8 second.
(5) expanding joint process of heavy wall nickel-base alloy heat exchanger tube as above and nickel-base alloy tube sheet, wherein, the tubesheet holes inside surface roughness of described tube sheet is less than 6.3 μm.
(6) expanding joint process of heavy wall nickel-base alloy heat exchanger tube as above and nickel-base alloy tube sheet, wherein, the aperture 0.05-0.10mm larger than heat exchanger tube external diameter of the tubesheet holes of described tube sheet.
(7) expanding joint process of heavy wall nickel-base alloy heat exchanger tube as above and nickel-base alloy tube sheet, wherein, tubesheet holes and tube sheet surface perpendicularity are less than 0.05mm.
In technique in the present invention, instantaneous pressure water acts on and produces expanding pressure between tube expander and heat exchanger tube inwall, expanding pressure makes heat exchanger tube first produce elastic deformation expansion and tube sheet hole wall is fitted, along with increase and the lasting pressurize of expanding pressure, heat exchanger tube continues extruded tube plate hole, heat exchanger tube produces plastic deformation, also slight plastic deformation is produced after tubesheet holes elastic deformation, after expanding pressure is cancelled, heat exchanger tube causes its external diameter to immobilize due to plastic deformation, tubesheet holes restores to the original state substantially because of elastic deformation, residual contact pressure is produced between such exchanger tubes and tubesheets, and then make both exchanger tubes and tubesheets compact siro spinning technology.
According to the expanding joint process of nickel-base alloy heat exchanger tube provided by the invention and nickel-base alloy tube sheet, be applicable to the expanded joint of Ni-based heat exchanger tube and Ni-based tube sheet, by strength and buckling, reach joint expanded joint intensity and sealing requirements, meet the needs of manufacturing process flow.
Specifically, according to the expanding joint process of nickel-base alloy heat exchanger tube provided by the invention and nickel-base alloy tube sheet, there is following benefit:
(1) the little and thickness of pipe wall of heat exchanger tube diameter; by setting suitable expanding pressure and dwell time; can guarantee that elastic deformation and the plastic deformation of appropriateness occur heat exchanger tube; and guarantee that the elastic deformation of appropriateness and slight plastic deformation occur tubesheet holes; thus between heat exchanger tube and tubesheet holes, produce the contact of appropriateness, both are engaged.
(2) material of exchanger tubes and tubesheets is all Incoloy-800H, and mechanical property is close, and during expanded joint, exchanger tubes and tubesheets plastic deformation occurs simultaneously, because tube sheet springback capacity is little, reduces expanded joint intensity and the sealing of joint.
Accompanying drawing explanation
Fig. 1 illustrates the expansion joint structural representation of nickel-base alloy heat exchanger tube and nickel-base alloy tube sheet according to the preferred embodiment of the present invention.
Drawing reference numeral illustrates:
1-nickel-base alloy tube sheet
2-heat exchanger tube
Detailed description of the invention
Below by the present invention is described in detail, the features and advantages of the invention will illustrate along with these and become more clear, clear and definite.
Word " exemplary " special here means " as example, embodiment or illustrative ".Here need not be interpreted as being better than or being better than other embodiment as any embodiment illustrated by " exemplary ".Although the various aspects of embodiment shown in the drawings, unless otherwise indicated, accompanying drawing need not be drawn in proportion.
According to a preferred embodiment of the present invention, the expanding joint process of a kind of heavy wall nickel-base alloy heat exchanger tube and nickel-base alloy tube sheet is provided, the expansion joint of nickel-base alloy heat exchanger tube and nickel-base alloy tube sheet is formed, as shown in Figure 1 by ultrahigh-pressure hydraulic expanded joint nickel-base alloy heat exchanger tube and nickel-base alloy tube sheet.
In the present invention, described nickel-base alloy heat exchanger tube is made up of Incoloy-800H nickel-base alloy, and its external diameter is 19.0-19.1mm, and pipe thickness is 2.95-3.05mm.When the external diameter of nickel-base alloy heat exchanger tube and pipe thickness are in above-mentioned scope, by superelevation also Hydraulic expansion-jointing mode and the good expanded joint of Ni-based tube sheet.If external diameter and pipe thickness be not in above-mentioned scope, may cause that exchanger tubes and tubesheets hole dilatancy is asynchronous, heat exchanger tube discontinuity and the adverse consequences such as impaired.
In the present invention, described nickel-base alloy tube sheet is made up of Incoloy-800H nickel-base alloy, and tube plate thickness is 300-320mm, and tube sheet bridge is 7-8mm, preferred 7.5-8mm.Such tube sheet, can under ultrahigh-pressure hydraulic effect, dilatancy under the above-mentioned nickel-base alloy heat exchanger tube bulbs of pressure, when removing ultrahigh-pressure hydraulic, forms by residual contact and heat exchanger tube the expansion joint expected.
In this article, term used " tube sheet bridge ", also referred to as " tube sheet bridge width ", refers to the distance that the adjacent tubes hole rim of tube sheet is nearest.
In a preferred embodiment of the invention, tubesheet holes and tube sheet surface perpendicularity are less than 0.05mm, are conducive to carrying out smoothly of expanded joint on the one hand, guarantee gained expansion joint excellent quality on the other hand.
In a preferred embodiment of the invention, the aperture 0.05-0.10mm larger than heat exchanger tube external diameter of the tubesheet holes of described tube sheet, is beneficial to carrying out smoothly of expanded joint.
In a preferred embodiment of the invention, tubesheet holes inside surface roughness is less than 6.3 μm, is beneficial to carrying out smoothly of expanded joint.If tubesheet holes inside surface roughness is less than 6.3 μm, causing because roughness is excessive frictional force between exchanger tubes and tubesheets excessive, heat exchanger tube unbalanced stress may be caused when being subject to ultrahigh-pressure hydraulic and impaired.
In the present invention, the expanding pressure of described ultrahigh-pressure hydraulic expanded joint is 300-350MPa, and the dwell time is 4-8 second.When expanding pressure and dwell time are within the scope of this, can carry out good expanded joint between above-mentioned heat exchanger tube and tube sheet, form good expansion joint, its pull-out force can reach more than 20000N, and water pressure resistance pressure at least can reach 10MPa.
In the present invention, owing to adopting Hydraulic expansion-jointing, the heat exchanger tube damage that mechanical expanding etc. can be avoided to cause, and, by design heat exchanger tube and the size of tube sheet, and select suitable Hydraulic expansion-jointing mode and expanding pressure, dwell time, Ni-based heat exchanger tube and tube sheet can be made synchronously by compression swelling, first elastic deformation, then plastic deformation, final formation stablizes expansion joint.
More than in conjunction with detailed description of the invention and exemplary example to invention has been detailed description, but these explanations can not be interpreted as limitation of the present invention.It will be appreciated by those skilled in the art that when not departing from spirit and scope of the invention, can carry out multiple equivalencing, modification or improvement to technical solution of the present invention and embodiment thereof, these all fall within the scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (5)
1. an expanding joint process for heavy wall nickel-base alloy heat exchanger tube and nickel-base alloy tube sheet, forms the expansion joint of nickel-base alloy heat exchanger tube and nickel-base alloy tube sheet by ultrahigh-pressure hydraulic expanded joint following nickel-base alloy heat exchanger tube and following nickel-base alloy tube sheet,
Wherein, described nickel-base alloy heat exchanger tube is made up of Incoloy-800H nickel-base alloy, and its external diameter is 19.0-19.1mm, and pipe thickness is 2.95-3.05mm,
Described nickel-base alloy tube sheet is made up of Incoloy-800H nickel-base alloy, and tube plate thickness is 300-320mm, and tube sheet bridge is 7-8mm,
The expanding pressure of described ultrahigh-pressure hydraulic expanded joint is 300-350MPa, and the dwell time is 4-8 second,
The aperture 0.05-0.10mm larger than heat exchanger tube external diameter of the tubesheet holes of described tube sheet,
Tubesheet holes and tube sheet surface perpendicularity are less than 0.05mm.
2. the expanding joint process of heavy wall nickel-base alloy heat exchanger tube according to claim 1 and nickel-base alloy tube sheet, wherein, the caliber of described nickel-base alloy heat exchanger tube is 19.05mm, and pipe thickness is 3.00mm.
3. the expanding joint process of heavy wall nickel-base alloy heat exchanger tube according to claim 1 and nickel-base alloy tube sheet, wherein, the tube plate thickness of described nickel-base alloy tube sheet is 310mm, and tube sheet bridge is 7.5-8mm.
4. the expanding joint process of heavy wall nickel-base alloy heat exchanger tube according to claim 1 and nickel-base alloy tube sheet, wherein, the expanding pressure of described ultrahigh-pressure hydraulic expanded joint is 320-330MPa, and the dwell time is 4-8 second.
5. the expanding joint process of heavy wall nickel-base alloy heat exchanger tube according to claim 1 and nickel-base alloy tube sheet, wherein, the tubesheet holes inside surface roughness of described tube sheet is less than 6.3 μm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310237823.1A CN103286231B (en) | 2013-06-14 | 2013-06-14 | Thick-wall nickel base alloy heat exchanging tube and nickel base alloy tube plate expanding-connecting technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310237823.1A CN103286231B (en) | 2013-06-14 | 2013-06-14 | Thick-wall nickel base alloy heat exchanging tube and nickel base alloy tube plate expanding-connecting technology |
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| CN103286231A CN103286231A (en) | 2013-09-11 |
| CN103286231B true CN103286231B (en) | 2015-05-20 |
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| CN106777780B (en) * | 2017-01-11 | 2020-04-14 | 中国特种设备检测研究院 | Method for analyzing flexible static pressure expansion joint mechanism of pipe-pipe plate joint |
| CN114101522B (en) * | 2021-11-12 | 2023-08-29 | 山东凯斯达机械制造有限公司 | Connection process of heat exchanger tube plate and heat exchange tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5445671A (en) * | 1978-08-30 | 1979-04-11 | Hitachi Ltd | Uniform pipe expansion method |
| DE3742480A1 (en) * | 1987-12-15 | 1989-06-29 | Emitec Emissionstechnologie | CONNECTING METHOD |
| EP1604752B1 (en) * | 2004-06-03 | 2008-03-19 | Balcke-Dürr GmbH | Method and device for hydraulic expansion |
| CN102107250B (en) * | 2010-12-09 | 2012-06-06 | 华东理工大学 | Method for determining expansion process parameters of tube and tube plate of AP1000 nuclear evaporator |
| CN102564207A (en) * | 2012-01-16 | 2012-07-11 | 黄争鸣 | Heat-insulating and corrosion-resisting composite tube plate and connecting structure between heat-insulating and corrosion-resisting composite tube plate and heat exchange tube |
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