US3342166A - Wall structure for vapor generator - Google Patents

Wall structure for vapor generator Download PDF

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Publication number
US3342166A
US3342166A US453669A US45366965A US3342166A US 3342166 A US3342166 A US 3342166A US 453669 A US453669 A US 453669A US 45366965 A US45366965 A US 45366965A US 3342166 A US3342166 A US 3342166A
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United States
Prior art keywords
path
panels
flow
tubes
fluid
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Expired - Lifetime
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US453669A
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English (en)
Inventor
Schaloske Peter
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Babcock International Ltd
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Babcock and Wilcox Ltd
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Publication date
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    • 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
    • F22B29/062—Construction of tube walls involving vertically-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
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor

Definitions

  • a forced circulation steam generator having a furnace wall structure comprising a pair of parallel flow throughflow paths, each path including a group of tube panels, each tube panel having a multiplicity of parallel flow tubes, with tubes of the panels of each path being interlaced with and rigidly united to tubes of the panels of the other path. Provisions are made for supplying fluid in parallel flow relation to the paths and for interconnecting the tube panels of each path so as to provide serial flow of fluid therethrough and so that with respect to the longitudinal edges of the wall structure the general direction of flow of fluid in one path is opposite to the general direction of flow of fluid in the other path.
  • the present invention relates to improvements in the construction and arrangement of fluid heating circuits especially adapted for use in a forced circulation oncethrough steam generating unit.
  • furnace wall fluid heating circuitry have been applied to vapor generators of the character described.
  • Most of these have one or more shortcomings including excessive thermal'stresses, uneven thermal expansion, an-d/ or lack of suflicient stability against transient conditionsof heat absorption inherent in the operation of a vapor generator of the character described.
  • each upright boundary wall of the-furnace comprises a "pair of parallel flow through-flow paths, each path including first and second groups of tube panels, each tube panel including a multiplicity of parallel flow tubes.
  • FIG. 1 is a diagrammatic view showing a furnace wall of a forced flow once-through steam generator constructed in accordance with the invention.
  • FIG. 2 is a side view corresponding to FIG. 1.
  • the furnace boundary wall fluid heating surface should be so proportioned and arranged that the temperature of the fluid in any tube at any furnace level differs no more than a predetermined amount from the average fluid temperature of all furnace wall tubes at that level; that the maximum temperature differential between adjacent tubes is below a predetermined critical limit; that fluid flow unbalances are minimized; and that the tubes of each fluid heating pass are sufiicient in number and in inside diameter along their length to provide adequate circulation velocities.
  • the structure of the drawings is intended for use as one of the upright boundary walls of a forced flow steam generator.
  • the wall structure comprises a pair of parallel flow through-flow paths A and B.
  • Path A includes a first group of upright coplan'ar tube panels A A A and A each having a multiplicity of upright parallel tubes 10 extending between inlet and outlet headers 12 and 14;
  • path B includes a first group of upright coplanar tube panels B B B and B each having a multiplicity of upright parallel tubes 16 extending between inlet and outlet headers 18 and 20.
  • Tubes 16 are disposed in the spaces between tubes 10, with tubes 10 and 16 being rigidly united, such as by metallic webs closing the intertube spaces and weld-united to the tubes, to form the lower portion of the wall structure.
  • Headers 12 and 14 of panels A and A are disposed somewhat below the corplanar tube panels A A A and A each having a multiplicity of upwardly extending parallel tubes 24 extending between inlet and outlet headers 26 and 28 disposed exteriorly of the wall; while path B additionally includes a second group of upright coplanar tube panels B B B and B each having a plurality of upright parallel tubes 30 extending between inlet and outlet headers 32 and 34.
  • Tubes 30 are disposed in the spaces between tubes 24, with tubes 30 and 24 being rigidly united in the same manner as tubes 10 and 16 to form the upper portion of the wall structure.
  • Headers 26 and 28 of panels A and A are situated somewhat below the corresponding headers of panels A and A and headers 32 and 34 of panels B and B are positioned somewhat below the corresponding headers of panels B and B
  • Inlet headers of panels A A B B inlet headers of panels A A B B outlet headers of panels A A B B and outlet headers of panels A A B B are respectively situated at common elevations, with the inlet headers of panels A A B B being situated intermediate outlet headers of panels A A B B and outlet headers of panels A A B B All of the tube panel inlet and outlet headers are so situated as not to be exposed to the high temperature heating gases.
  • Panels A B A B A B A and B are respectively aligned with panels B5, A8, B6, A7, B7, A6, B8 and A5.
  • the panel's thus arranged, tubes 10 of panels A and A have upper portions interlaced with lower portions of tubes 24 of panels A and A while tubes 16 of panels B and B, have upper portions interlaced with lower portions of tubes of panels B and B with the tube portions so interlaced being rigidly united to form an intermediate portion of the wall structure.
  • conduits 36 and 38 The interconnection of tube panels of fluid flow paths A and B are respectively provided by conduits 36 and 38, each of such conduits being disposed exteriorly of the wall and leading from a panel outlet header to the inlet header of the next adjacent panel of the corresponding flow path.
  • Parallel flow paths A and B are respectively supplied with high presure fluid by conduits 40 and 42, which lead from a common source, and discharge to other fluid heating circuitry, not shown, by way of conduits 44 and 46.
  • the height of the tube panels of each path is set so that in the event of unbalanced heat and/or fluid flow the temperature of the fluid leaving any tube of a panel is no greater than a predetermined amount above the average temperature of the fluid leaving the corresponding panel to prevent the possibility of undue thermal stresses between laterally adjacent tubes.
  • Each of the conduits 40 and 42 is provided with a throttle valve 48 to assist in neutralizing the effects of unbalances in heat and/or fluid flow.
  • the flow of fluid in path A is generally from left to right in the lower portion of the wall and from right to left in the upper portion of the wall, while the flow in path B is from right to left in the lower portion of the wall and from left to right in the upper portion of the wall.
  • a wall structure subject to high temperature heating gases comprising a pair of parallel flow through-flow paths, each path comprising a group of tube panels, each tube panel including a multiplicity of parallel flow tubes, tubes of the panels of each path being interlaced with and rigidly united to tubes of the panels of the other path, means for supplying fl'uid in parallel flow relation to said paths, means interconnecting the tube panels of each path so as to provide serial flow of fluid therethrough and so that with respect to the longitudinal edges of the wall structure the general direction of flow of fluid in said one path is opposite to the general direction of flow of fluid in said other path.
  • a wall structure subject to high temperature heating gases comprising a pair of parallel flow through-flow paths, each path comprising a group of tube panels, each tube panel including a multiplicity of upflow tubes arranged for parallel flow of fluid therethrough, tubes of the panels of each path being interlaced with and rigidly united to tubes of the panels of the other path, means for supplying fluid in parallel flow relation to said paths, means interconnecting the tube panels of each path so as to provide serial flow of fluid therethrough and so that with respect to the longitudinal edges of the wall structure the general direction of flow of fluid in said one path is contrary to the general direction of flow of fluid in said other path.
  • a wall structure subject to high temperature heating gases comprising a pair of parallel flow through-flow paths, each path comprising first and second groups of tube panels, each tube panel including a multiplicity of parallel flow tubes, tubes of the panels of the first group of each path being juxtaposed withtubes of the panels of the first group of the other path and cooperating therewith to form a lower portion of the wall structure, tubes of the panels of the second group of said one path being juxtaposed with tubes of the panels of the second group of the other path and cooperating therewith to form an upper portion of the Wall structure, means for supplying fluid in parallel flow relation to said paths, means interconnecting the tube panels of the first and second groups of each path so as to provide serial flow of fluid successively through the tube panels of the first group and the tube panels of the second group and so that with respect to the longitudinal edges of the wall structure the general direction of flow of fluid in said one path in either the upper or lower portion of the wall is opposite to the general direction of flow of fluid in said other path in the corresponding wall
  • a wall structure subject to high temperature heating gases comprising a pair of parallel flow through-flow paths, each path comprising first and second groups of tube panels, each tube panel including a multiplicity of parallel flow tubes, tubes of the panels of the first group of each path being interlaced with and rigidly united to tubes of the panels of the first group of the other path and cooperating therewith to form a lower portion of the wall structure, tubes of the panels of the second group of said one path being interlaced with and rigidly united to tubes of the panels of the second group of the other path and cooperating therewith to form an upper portion of the wall structure, means for supplying fluid in parallel flow relation to said paths, means interconnecting the tube panels of the first and second groups of each path so as to provide serial flow of fluid successively through the tube panels of the first group and the tube panels of the second group and so that with respect to the longitudinal edges of the wall structure the general direction of flow of fluid in said one path in either the upper or lower portion of the wall is opposite to the general direction of flow of fluid
  • awall subject to high temperature heating gases comprising a pair of parallel flow through-flow paths, each path comprising first and second groups of upflow tube panels, each tube panel including a multiplicity of parallel flow tubes, tubes of the panels of the first group of each path being interlaced with and rigidly united to tubes of the panels of the first group of the other path and cooperating therewith to form a lower portion of the wall structure, tubes of the panels of the second group of said one path being interlaced with and rigidly united to tubes of the panels of the second group of the other path and cooperating therewith to form an upper portion of the wall structure, tube panels of the first group of said one path being aligned with the tube panels of the second group of the other path, tube panels of the second group of said one path being aligned with tube panels of the first group of the other path, means for supplying fluid in parallel flow relation to said paths, means interconnecting the tube panels of the first and second groups of each path so as to provide serial flow of fluid successively through the tube panels of the
  • a wall structure subject to high temperature heating gases comprising a pair of parallel flow through-flow paths, each path comprising first and second groups of upflow tube panels, each tube panel including a multiplicity of parallel flow tubes, tubes of the panels of the first group of each path being interlaced with and rigidly united to tubes of the panels of the first group of the other path and cooperating therewith to form a lower portion of the wall structure, tubes of the panels of the second group of said one path being interlaced with and rigidly united to tubes of the panels of the second group of the other path and cooperating therewith to form an upper portion of the wall structure, tubes of some of the panels of the first group of said one path having upper portions interlaced with lower portions of tubes of some of the panels of the second group of said one path, tubes of some of the panels of the first group of said other path having upper portions interlaced with lower portions of tubes of some of the panels of the second group of said other path, means for supplying fluid in parallel flow relation to said paths, means interconnecting the tube

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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)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
US453669A 1964-05-09 1965-05-06 Wall structure for vapor generator Expired - Lifetime US3342166A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED44380A DE1244200B (de) 1964-05-09 1964-05-09 Zwangdurchlaufkessel mit geschweissten Rohrwaenden

Publications (1)

Publication Number Publication Date
US3342166A true US3342166A (en) 1967-09-19

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ID=7048281

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US453669A Expired - Lifetime US3342166A (en) 1964-05-09 1965-05-06 Wall structure for vapor generator

Country Status (6)

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US (1) US3342166A (xx)
BE (1) BE663697A (xx)
DE (1) DE1244200B (xx)
DK (1) DK118510B (xx)
GB (1) GB1049825A (xx)
NL (2) NL6505886A (xx)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989036A (en) * 1954-04-28 1961-06-20 Duerrwerke Ag Once-through vapor generating and superheating units
US3162179A (en) * 1962-12-05 1964-12-22 Gilbert Associates Fluid circulation system for a oncethrough type steam generator
US3247830A (en) * 1962-06-08 1966-04-26 Sulzer Ag Forced flow steam generator having plural tube systems

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE911264C (de) * 1951-04-22 1954-05-13 Siemens Ag Zwangstromdampferzeuger mit Strahlungsheizflaeche
DE1001284B (de) * 1955-08-20 1957-01-24 Duerrwerke Ag Durchlaufkessel mit einer aus mehreren Zyklonen bestehenden Feuerung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989036A (en) * 1954-04-28 1961-06-20 Duerrwerke Ag Once-through vapor generating and superheating units
US3247830A (en) * 1962-06-08 1966-04-26 Sulzer Ag Forced flow steam generator having plural tube systems
US3162179A (en) * 1962-12-05 1964-12-22 Gilbert Associates Fluid circulation system for a oncethrough type steam generator

Also Published As

Publication number Publication date
DE1244200B (de) 1967-07-13
NL6505886A (xx) 1965-11-10
DK118510B (da) 1970-08-31
GB1049825A (en) 1966-11-30
BE663697A (xx) 1965-09-01
NL130175C (xx)

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