EP0187542A2 - Transition hélicoidale en vertical pour tube de foyer - Google Patents

Transition hélicoidale en vertical pour tube de foyer Download PDF

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Publication number
EP0187542A2
EP0187542A2 EP85309545A EP85309545A EP0187542A2 EP 0187542 A2 EP0187542 A2 EP 0187542A2 EP 85309545 A EP85309545 A EP 85309545A EP 85309545 A EP85309545 A EP 85309545A EP 0187542 A2 EP0187542 A2 EP 0187542A2
Authority
EP
European Patent Office
Prior art keywords
furnace
tubes
vertical
section
tube wall
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.)
Withdrawn
Application number
EP85309545A
Other languages
German (de)
English (en)
Other versions
EP0187542A3 (fr
Inventor
Carl Lieb
Jerry L. Mullinax
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 Co
Original Assignee
Babcock and Wilcox Co
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 Co filed Critical Babcock and Wilcox Co
Publication of EP0187542A2 publication Critical patent/EP0187542A2/fr
Publication of EP0187542A3 publication Critical patent/EP0187542A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B29/00—Steam boilers of forced-flow type
    • F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
    • F22B29/061—Construction of tube walls
    • F22B29/065—Construction of tube walls involving upper vertically disposed water tubes and lower horizontally- or helically disposed water tubes
    • 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
    • F22B37/62—Component parts or details of steam boilers specially adapted for steam boilers of forced-flow type
    • F22B37/64—Mounting of, or supporting arrangements for, tube units
    • F22B37/645—Mounting of, or supporting arrangements for, tube units involving upper vertically-disposed water tubes and lower horizontally- or helically disposed water tubes

Definitions

  • the invention relates to furnace tube wall enclosures.
  • a lower section of the furnace comprises spiral-wound inclined tubes and an upper section comprises load-carrying vertical tubes which support the lower section.
  • inclined tubes will define the spiral-wound tubes in the lower furnace and “vertical tubes” the load-carrying vertical tubes in the upper portion of the furnace.
  • the invention is applicable to subcritical or supercritical once-through steam generators having all-welded membrane furnace walls.
  • a major problem in the design of such furnace tube wall enclosures is in the support system and in the tube arrangement in a transition zone from inclined tubes to vertical tubes.
  • the inclined tubes are sloped up to about 30 degrees from the horizontal and spiral up the furnace making several turns.
  • the inclined tubes terminate in a header below a furnace arch for transition to the vertical tubes in the upper section of the furnace. Because a near-horizontally oriented tube can usually carry only a limited amount of static load in the vertical direction, the inclined tube section of the furnace requires an external support system to transfer load to the vertical tubes.
  • a furnace tube wall enclosure defining a furnace for a once-through steam generator comprising, a lower furnace section of inclined tubes which spiral upwards to a transition zone, an upper furnace section of load-carrying vertical tubes in fluid communication with the lower furnace section, vertical external support straps spaced transversely about the lower furnace section and weldably connected to the inclined tubes of the lower furnace section for support thereof, and means for transfer of the static load of the lower furnace section from the support straps to the vertical tubes of the upper furnace section, characterised in that the upper furnace section extends below the transition zone to overlap a portion of the lower furnace section.
  • the lower section of inclined tubes is fed in parallel from a ring header at the bottom of the furnace.
  • the inclined tubes spiral upwards at an angle of up to about 30 degrees from the horizontal, making at least one full turn around the furnace, and terminating in vertical manifold headers located at spaced distances around the furnace.
  • the upper furnace section load-carrying vertical tubes are in fluid communication with the lower section at a transition zone.
  • the vertical and inclined tubes are spaced from one another and weldably interconnected by membranes forming a gas-tight enclosure.
  • the vertical external support straps are flush mounted and weldably attached to the tubes of the lower furnace section for transfer of the static load to the tubes of the upper furnace section. Causing the tubes of the upper section to overlap the tubes of the lower section can eliminate eccentric loading and simplify the tube arrangement at the transition zone.
  • a once-through steam generator 10 is shown having a lower furnace section 12 of inclined tubes 13 which are membraned and spiral upwards to a transition zone 16 below a furnace arch 18. From the transition zone 16, the inclined tubes 13 are in fluid communication with an upper furnace section 14 comprising vertical membraned tubes 15 in panels for upward flow to outlet headers 20.
  • the inclined and vertical tubes 13 and 15 are shown in greater detail in subsequent drawings.
  • Figure 2 illustrates the method of support of the inclined tubes 13 in the lower furnace section 12 and one of several support straps 22 with bars 24 which extend the full width of the support strap 22 and weldably interconnect membranes 26 of the inclined tubes 13 with the support strap 22.
  • the support strap 22 are mounted flush with the outside surface of the inclined tubes 13 and are spaced at suitable distances around the periphery of the lower furnace section 12 to accommodate the static load of the inclined tubes 13 and to transfer load to the vertical tubes 15 in the upper furnace section 14.
  • the upper ends (shown in Figures 5 and 8) of the support straps 22 are flared to a greater width for transfer of load to a greater number of vertical tubes 15.
  • Figure 3A shows a previously proposed design of the transition zone and the load transfer from the support straps 22 to the vertical tubes 15 by means of finger plates 30.
  • the longitudinal centrelines of the vertical tubes 15 are in line with the centrelines of the inclined tubes 13. Since the static load of the lower furnace section 12 is carried by the support straps 22, a turning moment is produced due to eccentricity. To eliminate this moment, a complex, expensive pinned linkage system 28 is employed between the support straps 22 and vertical buckstays 32. Also shown are the membranes 26 of the inclined tubes 13, membranes 27 of the vertical tubes 15, and the bars 24 interconnecting the membranes 26 with the support strap 22.
  • FIG. 3B An improved design is shown in Figure 3B.
  • the vertical tubes 15 are located to overlap the inclined tubes 13.
  • the longitudinal centrelines of the vertical tubes 15 are approximately in line with the centrelines of the support straps 22 thereby eliminating the moment due to eccentric loading while also eliminating the vertical buckstays 32 and the linkage system 28 associated with the previously proposed design shown in Figure 3A.
  • a seal 34 between the uppermost tubes 13 and the vertical tube membranes 27 ensures the gas tight integrity of the furnace enclosure.
  • Other advantages of this improved design will become apparent as it is described with reference to subsequent drawings. Also shown is one of the finger plates 30 and the inclined tube membranes 26.
  • Figure 4 is a view from the furnace side showing the closure at the transition zone of the previously proposed design.
  • the inclined tubes 13 leave the furnace at the same horizontal plane and terminate in a horizontal outlet header, not shown, exterior to the furnace enclosure. Since the longitudinal centrelines of the vertical tubes 15 are in line with the inclined tube centrelines, the vertical tubes 15 leave the furnace at varying elevations, following the slope of the inclined tubes 13. Accordingly, the vertical tube membranes 27 also terminate at varying elevations.
  • closure plates 36 of various shapes are required to seal the areas between the terminations of the vertical membranes 27 and the uppermost inclined tubes 13. As is evident from Figure 4 this is an expensive design requiring much hand fitting and welding in the field during erection.
  • the vertical tubes 15 require individual hand bending because of the varying elevations where they leave the furnace and terminate in an external header, not shown.
  • FIGs 5, 6 and 7 illustrate in detail the improved design and its advantages.
  • the inclined tubes 13 leave the furnace in vertical groups of five, although a greater or lesser number of the tubes 13 may be grouped.
  • the groups penetrate to outside the furnace through spaces between the vertical tubes 15 and terminate in outlet vertical manifolds 38 spaced at suitable distances around the furnace.
  • the manifolds 38 are connected to horizontal inlet headers 40 for fluid flow communication. Flow is then upward in the vertical tubes 15 to the outlet headers 20 (shown in Figure 1).
  • the vertical tubes 15 overlap the inclined tubes 13 and bend outwardly in a horizontal plane below the inclined tube exit groups, terminating in the horizontal headers 40. Expensive closure plates are eliminated and field hand welding is reduced.
  • the vertical tubes 15 are machine pack-bent in panels eliminating the individual hand bending of the previous design. Also shown are the finger plates 30 and the support straps 22.
  • Figures 8 and 9 are similar to Figures 5 and 7 but are viewed from outside the furnace. Shown is the flared end of one of the support straps 22 having ten vertical finger plates 30 welded thereto and the upper ends of the finger plates welded to adjacent pairs of the vertical tubes 15 for load transference. A greater or lesser number of finger plates 30 may be employed, depending on the magnitude of the static load of the lower furnace section 12 and the width of the flared upper ends of the support straps 22. Also shown are the inclined tubes 13, and the inclined and vertical tube membranes 26 and 27, respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
EP85309545A 1985-01-04 1985-12-30 Transition hélicoidale en vertical pour tube de foyer Withdrawn EP0187542A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US68894585A 1985-01-04 1985-01-04
US688945 1985-01-04

Publications (2)

Publication Number Publication Date
EP0187542A2 true EP0187542A2 (fr) 1986-07-16
EP0187542A3 EP0187542A3 (fr) 1987-09-02

Family

ID=24766441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85309545A Withdrawn EP0187542A3 (fr) 1985-01-04 1985-12-30 Transition hélicoidale en vertical pour tube de foyer

Country Status (5)

Country Link
EP (1) EP0187542A3 (fr)
JP (1) JPS61211606A (fr)
CN (1) CN1012448B (fr)
CA (1) CA1271376A (fr)
ES (1) ES8702627A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621447A1 (fr) * 1993-04-21 1994-10-26 ABB Management AG Chambre de combustion d'un générateur de vapeur et son procédé de fabrication
DE102006005208A1 (de) * 2006-02-02 2007-08-16 Hitachi Power Europe Gmbh Hängender Dampferzeuger

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201344517Y (zh) * 2009-01-12 2009-11-11 上海锅炉厂有限公司 一种螺旋水冷壁传力吊带装置
DE102010038885B4 (de) * 2010-08-04 2017-01-19 Siemens Aktiengesellschaft Zwangdurchlaufdampferzeuger
CN114933912B (zh) * 2022-06-24 2024-07-09 山东天景工程设计有限公司 一种减小焦炉荒煤气余热利用换热器内偏流的装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1401371B2 (de) * 1961-11-02 1970-02-19 Siemens AG, 1000 Berlin u. 8000 München Durchlaufkessel mit überdruckfeuerung
GB1405752A (en) * 1971-08-05 1975-09-10 Babcock & Wilcox Ltd Tubulous vapour generating units
DE2621189C3 (de) * 1976-05-13 1980-02-21 Balcke-Duerr Ag, 4030 Ratingen Vorrichtung zur Aufhängung einer Rohrwand
CH634905A5 (de) * 1978-12-20 1983-02-28 Sulzer Ag Dampferzeugerwand.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621447A1 (fr) * 1993-04-21 1994-10-26 ABB Management AG Chambre de combustion d'un générateur de vapeur et son procédé de fabrication
DE102006005208A1 (de) * 2006-02-02 2007-08-16 Hitachi Power Europe Gmbh Hängender Dampferzeuger
US7509928B2 (en) 2006-02-02 2009-03-31 Hitachi Power Europe Gmbh Suspended steam boiler

Also Published As

Publication number Publication date
EP0187542A3 (fr) 1987-09-02
JPS61211606A (ja) 1986-09-19
CN1012448B (zh) 1991-04-24
CN86100007A (zh) 1986-10-01
JPH0343521B2 (fr) 1991-07-02
ES8702627A1 (es) 1987-01-01
CA1271376A (fr) 1990-07-10
ES550653A0 (es) 1987-01-01

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Inventor name: MULLINAX, JERRY L.

Inventor name: LIEB, CARL