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EP2088371B1 - Châssis de support pour les tubes d'un échangeur de chaleur - Google Patents

Châssis de support pour les tubes d'un échangeur de chaleur Download PDF

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Publication number
EP2088371B1
EP2088371B1 EP07252836.7A EP07252836A EP2088371B1 EP 2088371 B1 EP2088371 B1 EP 2088371B1 EP 07252836 A EP07252836 A EP 07252836A EP 2088371 B1 EP2088371 B1 EP 2088371B1
Authority
EP
European Patent Office
Prior art keywords
sloped
support members
tube segments
structural framework
rows
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07252836.7A
Other languages
German (de)
English (en)
Other versions
EP2088371A2 (fr
EP2088371A3 (fr
Inventor
George H. Harth, Iii
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Babcock and Wilcox Power Generation Group Inc
Original Assignee
Babcock and Wilcox Power Generation Group Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Babcock and Wilcox Power Generation Group Inc filed Critical Babcock and Wilcox Power Generation Group Inc
Priority to DK07252836.7T priority Critical patent/DK2088371T3/da
Priority to ES07252836.7T priority patent/ES2488852T3/es
Priority to PL07252836T priority patent/PL2088371T3/pl
Priority to EP07252836.7A priority patent/EP2088371B1/fr
Priority to PT72528367T priority patent/PT2088371E/pt
Publication of EP2088371A2 publication Critical patent/EP2088371A2/fr
Publication of EP2088371A3 publication Critical patent/EP2088371A3/fr
Application granted granted Critical
Publication of EP2088371B1 publication Critical patent/EP2088371B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
    • F22B37/205—Supporting and spacing arrangements for tubes of a tube bundle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
    • F22B37/202—Suspension and securing arrangements for contact heating surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0135—Auxiliary supports for elements for tubes or tube-assemblies formed by grids having only one tube per closed grid opening
    • F28F9/0136—Auxiliary supports for elements for tubes or tube-assemblies formed by grids having only one tube per closed grid opening formed by intersecting strips

Definitions

  • the present invention relates, in general, to a supporting structural framework for serpentine type tubular heat exchangers located in the vertical gas passageways of steam generators, and more particularly, to the structure and support of the serpentine oriented tubes to cause the drainage of fluid collected therein when the steam generators are shutdown.
  • Pitting corrosion is a localized form of corrosion by which cavities or holes are produced in a metal. Pitting is commonly observed on surfaces with little or no general corrosion. Pitting corrosion is generally of greater concern than uniform corrosion because it is more difficult to detect and protect against. Corrosion products often cover the pits, making them difficult to identify. Apart from localized loss of thickness at the tube metal surface, corrosion pits can also be harmful by acting as stress risers. Corrosion pits are commonly the starting points for cracking and fatigue.
  • An extremely corrosive microenvironment typically forms within a corrosion pit that varies considerably from the bulk corrosive environment. This corrosive microenvironment can hasten growth of pits once initially formed.
  • Pitting corrosion can produce pits in a variety of configurations. For example, open pits may be formed, or pits may be covered with a semi-permeable skin comprising corrosive products.
  • Pits can be hemispherical or cup-shaped, flat-walled, or completely irregular in shape. Pits may also reveal the crystal structure of the tube metal. Through-shaped pits may be narrow and deep or shallow and wide. Sideways pits may be sub surface, undercutting, or attack the grain of the metal horizontally.
  • the corrosion problem is exacerbated at locations where attachment welds are made to the heat exchanger tubing, such as with the supports used to maintain the tubes and tube rows of a heat exchanger tube bank in coplanar spaced-apart and parallel relation.
  • the heat affected zones of the attachment welds are prone to pitting corrosion.
  • Weld attachments are also known to restrict the thermal expansion and contraction of the tubing and thus cause it to distort or sag, such that low spots are formed in the horizontal runs of the tubing. These low spots collect water after the steam generator is shutdown and are susceptible to pitting corrosion.
  • GB 1496443 discloses an economiser structure supported by support rods.
  • the document describes in more detail an arrangement of non-weight supporting vibration inhibition frameworks. This document does not teach, at least, some of a plurality of support members that extend between sloped-tube segments of straddled rows of tubes being concavo-concave blocks having recessed sides facing adjacent portions of the sloped-tube segments of the straddled row.
  • US 6,244,330 describes anti-vibration ties for tube bundles.
  • the anti-vibration ties of this document are provided without an additional connection to an external support and are located approximately mid-span between adjacent external supports.
  • GB 2180046 describes a grid-type flow distribution baffle for a heat exchanger.
  • the grid-type flow distribution baffle is provided for an array of substantially parallel, vertically oriented, heat exchanged tubes inside a heat exchanger, particularly a nuclear steam generator, and for controlling the flow of heat exchanging fluid along the length of those tubes.
  • the baffle comprises a plurality of interlocking grid members for providing an array of parallel tube-capturing, flat-walled cells for heat exchanged tubes.
  • a fluid flow resisting flange structure to encourage fluid flow perpendicular to the tubes is disposed at one end of each of the cells in the corners thereof but is not in contact with the tube so that regions of point contact with the tube which would result in wear are avoided.
  • This framework is applicable to a heat exchanger having at least one bank of spaced serpentine fluid conveying tube rows disposed within a vertical passageway of the steam generator in side-by-side parallel relation across the gas stream which is flowing through the passageway.
  • Each of the tube rows includes spaced and substantially coplanar elongate sloped-tube segments and return-bend tube segments.
  • the sloped-tube segments replace the prior art horizontal tube segments and thus greatly facilitate the drainage of water from the heat exchanger when the steam generator is shutdown.
  • the bank of serpentine tubes is supported in a manner which will allow thermal expansion and contraction to take place without causing the tubing to distort or sag and thus form low spots that are apt to collect water when the steam generator is shutdown.
  • the structural frameworks include paired groups of vertically and diagonally extending first support members contiguously straddling the sloped-tube segments.
  • the vertical structural frameworks are formed of paired vertically extending first support members that are rigidly connected by second support members or lateral cross bars which extend between the straddled sloped-tube segments.
  • the diagonal structural frameworks are formed of paired diagonally extending first support members that are rigidly connected by second support members or lateral compression supports which extend between the straddled sloped-tube segments.
  • the diagonal structural frameworks transmit the heat exchanger support loads to the walls of the vertical passageway housing the heat exchanger.
  • the structural frameworks preserve the spacing between the sloped-tube segments and prevent direct contact between adjoining tube surfaces, but are not attached to the straddled tube segments and thus provide a tube supporting fit that is loose enough to permit the tubes to move freely due to thermal expansion and contraction at different rates from that of the structural frameworks, thereby preventing the distortion and sagging of tubes and the formation of water collecting low spots.
  • FIG. 1 is a schematic sectional side view of a steam generator including a heat exchanger embodying the present invention
  • FIG. 2 is a fragmented, sectional side view of the heat exchanger, and its tube banks and support members;
  • FIG. 3 is a fragmented, perspective view of the heat exchanger tube banks and support members
  • FIG. 4 is a fragmented, enlarged sectional view of the vertical support members and the lateral cross bars taken along line 4 - 4 of FIG. 3 ;
  • FIG. 5 is a fragmented, enlarged side view of the vertical support members and the lateral cross bars taken along line 5 - 5 of FIG. 4 ;
  • FIG. 6 is a fragmented, enlarged sectional view of the diagonal support members and the lateral compression supports taken along line 6 - 6 of FIG. 3 ;
  • FIG. 7 is a fragmented, enlarged side view of the diagonal support members and the lateral compression supports taken along line 7 - 7 of FIG. 6 .
  • a steam generator 10 including water cooled tubular walls 12 that define a furnace chamber or combustion space 14 to which a fuel and air mixture is supplied by burners as schematically shown at 16.
  • the hot gases flow upwardly and around the furnace chamber nose portion 18, and across through the horizontal section 22 of the convection passageway 23, and thence downwardly through the vertical section 24 of the convection passageway 23 which is defined by walls 25 and includes a heat exchanger such as the primary superheater 26.
  • the gases leaving the vertical section 24 of the convection passageway 23 flow through an air heater, not shown, and thence through a gas clean-up system, not shown, and are thereafter discharged through a stack, not shown.
  • the heat exchanger 26 includes banked rows 27 of spaced serpentine tubes 28, as shown in FIG. 3 , extending across the width of the vertical section 24 of the convection passageway 23, and arranged for fluid flow therethrough and in indirect heat exchange with the combustion gases flowing through the vertical section or passageway 24.
  • FIGS. 2 and 3 there are shown fragmented sectional side and perspective views, respectively, of a heat exchanger 26 including a plurality of serpentine tubes 28 disposed in side-by-side parallel relation to one another, as shown in FIG. 3 , and across the gas stream which is flowing through the vertical section 24 of the convection passageway 23, as shown in FIGS. 1 and 2 , and with each serpentine tube 28 having elongate sloped-tube segments 30 and return-bend tube segments 32 forming the rows 27 of tube banks 34.
  • the elongated tube segments 30 of the serpentine tubes 28 extend at an angle downwardly from the horizontal to cause fluid to be drained from the serpentine tubes 28 when the steam generator 10, shown in FIG. 1 , is shutdown.
  • the serpentine tubes 28 of heat exchanger 26 are supported by vertically extending structural frameworks 39 and diagonally extending structural frameworks 41.
  • the heat exchanger 26 is itself supported by the walls 25, shown in FIGS. 1 and 2 , by way of the first support lugs 35 which are rigidly connected, preferably by welding, to the lower end of the outermost return-bend tube segment 32 of each tube bank 34 and slidably engaged with the second support lugs 37, the latter being rigidly connected, preferably by welding, to the walls 25.
  • the diagonally extending structural frameworks 41 are located closest to the return-bend segments 32 and transmit the heat exchanger 26 support loads to the first support lugs 35 which, in turn, transmit the support loads to the second support lugs 37 and thence onto the walls 25 of vertical passageway 24.
  • the vertically extending structural framework 39 includes first support members 36 which are generally in the form of vertically extending bars or plates that are paired to contiguously straddle the sloped-tube segments 30, and second support members 38, shown in FIG. 3 , which are generally in the form of laterally extending cross bars or plates which run between the straddled sloped-tube segments 30.
  • the vertically extending first support members 36 are rigidly attached to or connected with the laterally extending second support members 38, preferably by welding, to insure that the latter remain tightly drawn against the straddled sloped-tube segments 30, while preserving the spacing between the sloped-tube segments 30 and preventing direct contact between adjoining tube surfaces.
  • the rigidly interconnected first and second support members 36 and 38, respectively are not welded or otherwise attached to the serpentine tubes 28, thereby creating a structural framework 39 which provides a tube supporting fit that is loose enough to permit relative thermal expansion and contraction of the serpentine tubes 28 and the framework 39, the latter being comprised of the first and second support members 36 and 38, respectively.
  • the diagonally extending structural framework 41 includes first support members 42 which are generally in the form of diagonally extending bars or plates that are paired to contiguously straddle the sloped-tube segments 30, and second support members or compression supports 44, shown in FIG. 3 , which are generally in the form of laterally extending blocks that run between the straddled sloped-tube segments 30, and are contoured to engage the adjacent surfaces of the sloped-tube segments 30.
  • the compression supports 44 are rigidly secured to the paired diagonally extending first support members 42, preferably by welding, to insure that the latter remain tightly drawn against the straddled sloped-tube segments 30, while preserving the spacing between the sloped-tube segments 30, and preventing direct contact between adjoining tube surfaces, and also transmitting the heat exchanger 26 support loads from the first support lugs 35 to the second support lugs 37 and hence to the walls 25 which form the vertical section 24 of the convection passageway 23.
  • the rigidly interconnected first and second support members or compression supports 42 and 44 are not welded or otherwise attached to the serpentine tubes 28. thereby creating a structural framework 41 which provides a heat exchanger and tube supporting fit that is loose enough to permit relative thermal expansion and contraction of the serpentine tubes 28 and the framework 41, the latter being comprised of the first and second support members 42 and 44.
  • FIGS. 4 and 5 there are shown fragmented, enlarged sectional and side views of the vertically extending first support members 36 and the laterally extending second support members or cross bars 38.
  • the paired first support members 36 straddle the sloped-tube segments 30 of the serpentine tubes 28.
  • the first support members 36 are drawn tightly against the sloped-tube segments 30 and are rigidly maintained in that position by the second support members or cross bars 38, which are rigidly attached to the first support members 36 by welds 40.
  • the vertically extending structural framework 39 formed by the first support members 36 and the second support members 38 preserves the spacing between the sloped-tube segments 30 and prevents direct contact between adjoining tube surfaces, but is not attached to the straddled sloped-tube segments 30 and is loose enough to allow the serpentine tubes 28 and the structural framework 39 to move freely in response to thermal expansion and contraction.
  • FIGS. 6 and 7 there are shown fragmented, enlarged sectional and side views of the diagonally extending first support members 42 and the laterally extending second support members or compression supports 44.
  • the first support members 42 are drawn tightly against the sloped-tube segments 30 and are maintained in that position by the second support members or compression supports 44. which are rigidly attached to the first support members 42 by welds 43.
  • the second support members or compression supports 44 are formed as a solid block of concavo-concave cross-sectional configuration so as to have the concave recesses 45 engage the contiguous portion of the adjacent sloped-tube segments 30, as shown in FIG. 7 , and thereby support the serpentine tube 28 off the first support members 42, while maintaining the spacing between adjacent sloped-tube segments 30.
  • the diagonally extending framework 41 formed by the first support members 42 and the second support members or compression supports 44 maintains the spacing between the sloped-tube segments 30 and prevents direct contact between adjacent tube surfaces, while also supporting the serpentine tubes 28 off the first support members 42, but is not attached to the straddled sloped-tube segments 30, and is loose enough to allow the serpentine tubes 28 and the structural framework 41 to move freely in response to thermal expansion and contraction.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (6)

  1. Châssis de support structurel (39) pour un échangeur de chaleur tubulaire (26) ayant au moins un banc de tubes en serpentin (28) disposés en rangées espacées parallèlement et côte à côte, chacune des rangées comportant des segments de tube inclinés (30) allongés coplanaires et espacés et des segments de tube de coudes de retour, le châssis de support structurel comportant des premiers et deuxièmes organes de support (36, 38, 42, 44), les premiers organes (36, 42) étant appariés de manière à chevaucher les segments de tube inclinés (30) de chacune d'au moins certaines des rangées et les deuxièmes organes (38, 44) s'étendant entre les segments de tube inclinés (30) des rangées chevauchées, où certains des deuxièmes organes de support (38, 44) sont des blocs concaves-concaves ayant des côtés en retrait faisant face à des parties adjacentes des segments de tube inclinés (30) de la rangée chevauchée, et les premiers et deuxièmes organes de support (36, 38, 42, 44) étant rigidement interconnectés pour fournir un ajustement de support de tubes qui est suffisamment lâche pour permettre un mouvement relatif entre les tubes et le châssis de support structurel du fait de la différence entre la dilatation et la contraction thermique.
  2. Châssis structurel selon la revendication 1, dans lequel les premiers organes de support (36, 42) sont des barres s'étendant verticalement appariées de manière à chevaucher les segments de tube inclinés (30) de chacune d'au moins certaines des rangées.
  3. Châssis structurel selon la revendication 1 ou 2, dans lequel les deuxièmes organes de support (38, 44) sont des barres s'étendant latéralement appariées de manière à chevaucher les segments de tube inclinés de chacune d'au moins certaines des rangées.
  4. Châssis structurel selon la revendication 1, 2 ou 3, dans lequel les premiers organes de support (36, 42) sont des barres s'étendant en diagonale appariées de manière à chevaucher les segments de tube inclinés de chacune d'au moins certaines des rangées.
  5. Châssis structurel (39) selon l'une quelconque des revendications précédentes, comportant les côtés en retrait formés de manière à se conformer à la forme en section transversale des parties en regard des segments de tube inclinés (30).
  6. Combinaison d'un générateur de vapeur en ligne (10) produisant un flux de gaz de fumée chauffé et comportant un passage vertical à travers lequel le flux de gaz est transporté, d'un châssis de support structurel (39) selon l'une quelconque des revendications précédentes, et d'un moyen pour faire passer un fluide à chauffer à travers les tubes.
EP07252836.7A 2007-07-18 2007-07-18 Châssis de support pour les tubes d'un échangeur de chaleur Not-in-force EP2088371B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DK07252836.7T DK2088371T3 (da) 2007-07-18 2007-07-18 Støtterammeanordning for en rørvarmeveksler
ES07252836.7T ES2488852T3 (es) 2007-07-18 2007-07-18 Armazón estructural de soporte para un intercambiador de calor tubular
PL07252836T PL2088371T3 (pl) 2007-07-18 2007-07-18 Strukturalny ramowy szkielet wsporczy do rurowego wymiennika ciepła
EP07252836.7A EP2088371B1 (fr) 2007-07-18 2007-07-18 Châssis de support pour les tubes d'un échangeur de chaleur
PT72528367T PT2088371E (pt) 2007-07-18 2007-07-18 Quadro de suporte estrutural para permutador de calor tubular

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07252836.7A EP2088371B1 (fr) 2007-07-18 2007-07-18 Châssis de support pour les tubes d'un échangeur de chaleur

Publications (3)

Publication Number Publication Date
EP2088371A2 EP2088371A2 (fr) 2009-08-12
EP2088371A3 EP2088371A3 (fr) 2009-08-19
EP2088371B1 true EP2088371B1 (fr) 2014-05-21

Family

ID=40791316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07252836.7A Not-in-force EP2088371B1 (fr) 2007-07-18 2007-07-18 Châssis de support pour les tubes d'un échangeur de chaleur

Country Status (5)

Country Link
EP (1) EP2088371B1 (fr)
DK (1) DK2088371T3 (fr)
ES (1) ES2488852T3 (fr)
PL (1) PL2088371T3 (fr)
PT (1) PT2088371E (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102261641B (zh) * 2011-02-21 2016-02-10 哈尔滨锅炉厂有限责任公司 超临界锅炉过热器管屏固定装置及方法
CN102250659A (zh) * 2011-06-22 2011-11-23 中国石油集团工程设计有限责任公司 天然气脱水脱烃预冷器
EP2960614B1 (fr) * 2013-04-25 2018-03-14 Mitsubishi Heavy Industries, Ltd. Dispositif et procédé permettant de supprimer les vibrations d'un tube de transfert de chaleur et générateur de vapeur
US10006369B2 (en) 2014-06-30 2018-06-26 General Electric Company Method and system for radial tubular duct heat exchangers
US9777963B2 (en) 2014-06-30 2017-10-03 General Electric Company Method and system for radial tubular heat exchangers
US9835380B2 (en) 2015-03-13 2017-12-05 General Electric Company Tube in cross-flow conduit heat exchanger
US10378835B2 (en) 2016-03-25 2019-08-13 Unison Industries, Llc Heat exchanger with non-orthogonal perforations
CN109695866A (zh) * 2018-04-26 2019-04-30 中电华创电力技术研究有限公司 一种适用于锅炉高温再热器的支吊架装置
CN109395691A (zh) * 2018-12-22 2019-03-01 山东大明精细化工有限公司 一种用于生产表面活性剂的管道式反应器及其使用方法
US12259194B2 (en) 2023-07-10 2025-03-25 General Electric Company Thermal management system

Citations (3)

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US4589618A (en) * 1981-10-23 1986-05-20 Creusot-Loire Holding device for a tube bundle
US5072786A (en) * 1990-07-27 1991-12-17 Electric Power Research Institute, Inc. Anti-vibration support of U-bend flow tubes in a nuclear steam generator
US20060005787A1 (en) * 2003-10-28 2006-01-12 Nansheng Sun Anti-vibration support for steam generator heat transfer tubes and method for making same

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US3929189A (en) * 1974-03-20 1975-12-30 Babcock & Wilcox Co Heat exchanger structure
US4480594A (en) * 1984-02-21 1984-11-06 Combustion Engineering, Inc. Economizer support
US4665866A (en) * 1985-09-04 1987-05-19 Westinghouse Electric Corp. Grid-type flow distribution baffle
JPS62248996A (ja) * 1986-04-22 1987-10-29 Babcock Hitachi Kk 伝熱管群の支持構造
US6244330B1 (en) * 1998-11-16 2001-06-12 Foster Wheeler Corporation Anti-vibration ties for tube bundles and related method
US6158221A (en) * 1999-01-13 2000-12-12 Abb Alstom Power Inc. Waste heat recovery technique

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US4589618A (en) * 1981-10-23 1986-05-20 Creusot-Loire Holding device for a tube bundle
US5072786A (en) * 1990-07-27 1991-12-17 Electric Power Research Institute, Inc. Anti-vibration support of U-bend flow tubes in a nuclear steam generator
US20060005787A1 (en) * 2003-10-28 2006-01-12 Nansheng Sun Anti-vibration support for steam generator heat transfer tubes and method for making same

Also Published As

Publication number Publication date
DK2088371T3 (da) 2014-08-04
ES2488852T3 (es) 2014-08-29
EP2088371A2 (fr) 2009-08-12
PT2088371E (pt) 2014-08-04
EP2088371A3 (fr) 2009-08-19
PL2088371T3 (pl) 2014-10-31

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