US3448726A - Steam generator having a flue and an access shaft - Google Patents

Steam generator having a flue and an access shaft Download PDF

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Publication number
US3448726A
US3448726A US691258A US3448726DA US3448726A US 3448726 A US3448726 A US 3448726A US 691258 A US691258 A US 691258A US 3448726D A US3448726D A US 3448726DA US 3448726 A US3448726 A US 3448726A
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United States
Prior art keywords
flue
shaft
tubes
access
steam generator
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.)
Expired - Lifetime
Application number
US691258A
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English (en)
Inventor
Richard Litwinoff
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.)
Sulzer AG
Original Assignee
Sulzer AG
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Filing date
Publication date
Application filed by Sulzer AG filed Critical Sulzer AG
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Publication of US3448726A publication Critical patent/US3448726A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F22B35/00—Control systems for steam boilers
    • F22B35/001—Controlling by flue-gas dampers
    • 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

Definitions

  • the access shaft is disposed within the walls of the flue and is arranged in parallel relation to the flue walls in order to avoid the need of any ingress apertures in the side walls of the flue.
  • the shaft has openings adjacent the spaces between the nests of tubes to provide entry from the shaft into these spaces for inspection or repair of the nests of tubes.
  • This invention relates to a steam generator having a flue and an access shaft. More particularly, this invention relates to a steam generator having a flue and an internal access shaft.
  • the invention provides a steam generator having a flue containing spaced nests of tubes therein with an access shaft parallel to and within the tube covered boundary walls of the flue.
  • the access shaft is sized so as to permit a person to pass through into the nests of tubes.
  • the access shaft is provided with an aperture at the level of each accessible space between the nests of tubes to permit entry into these accessible spaces.
  • the access shaft is formed so that penetration of the flue gas through the tubes about the flue side walls is avoided.
  • the access shaft is formed with a continuous sheet metal pipe.
  • the pipe is apertured at the levels of the accessible spaces between the nests of tubes and is provided with flaps at these levels to close off the apertures.
  • the access shaft is formed of spaced individual sections of sheet metal pipe.
  • Each section of pipe extends over the height of one nest of tubes and includes a flap for closing off the shaft.
  • the aperture leading to the accessible space can be made very large within the shaft so as not only to increase the freedom of movement permited the person en- 3,448,726 Patented June 10, 1969 tering the accessible spaces but also to reduce the amount of material required for the shaft.
  • each section of pipe is suspended from one of the tube lined walls of the flue so that the wall of the flue constitutes a wall of the access shaft. This wall of the flue is thus available for inspection as well as being subject to being heated by the flue gas.
  • FIG. 1 illustrates a vertical section through a powertype steam generator of the invention
  • FIG. 2 illustrates a fragmentary perspective view of a modified access shaft of the invention in place in a steam generator of the above type
  • FIG. 3 illustrates a fragmentary sectional view of a section of the access shaft of FIG. 2. suspended from the tube lined wall of the flue.
  • the power-type steam generator 2 is suspended from a supporting frame 1.
  • the steam gener-ator 2 has a gas tight tubular wall 3 which encloses a combustion chamber 6 and a gas flue 30 above the combustion chamber.
  • the upper end of the gas flue 30 merges into a cover 4 adjacent to a chimney 5 for expelling the combustion gas as is known.
  • a heating surface 7 constructed in the form of partitions is disposed in the upper end of the combustion chamber 6 while heating surfaces 8, 9, 10, 11 constructed in the form of nests of tubes are disposed in the subsequent flue 30.
  • An accessible space 7', 8, 9, 10', 11' is provided above each of the heating surfaces so as to permit a person to move about.
  • An access shaft 12 is positioned within the wall 3 in the flue 30 and in parallel relation to the wall 3.
  • the shaft 12 is formed of a continuous sheet metal pipe of rectangular cross-section and penetrates through the cover 4 down into the nests of tubes 8, '9, 10, 11 to permit passage of a person.
  • the top end of the shaft 12 which provides 'access to the shaft 12 is closed by a cover 13 while a ladder 19 is fixed to an interior wall of the shaft 12 for permitting a person to climb down into the nests of tubes.
  • the wall of the shaft :12 adjacent .the nests of tubes is provided with apertures at the level of each accessible space 8',-9', 10', 11 as well as flaps 14, 15, 16, 17 for closing off each aperture.
  • the flaps When in a vertical position as indicated by the solid lines, the flaps close off the apertures while when in a generally horizontal position as indicated by the dashed lines, the flaps serve as floors. Additionally the flaps can be made to assume a third position, that is, the flaps can be allowed to hang downwardly in the shaft.
  • Another flap 18 is secured to the 'bottom end of the access shaft 12 to close off the shaft bottom.
  • the flap 18 can be moved into a depending position as shown in dashed lines to provide access to the space 7 above the lower heating surface 7.
  • the flaps 14 to 18 are each provided with a suitable securing means (not shown) to permit securement in the respective horizontal and vertical positions described above.
  • the access shaft 12 can otherwise be made of spaced individual sections of sheet metal pipe 23, 24 of balcony-like box shape one above the other which are suspended from the tube wall 3.
  • the adjacent side of the tube wall 3 thus serves as the remaining fourth wall of the access shaft 12.
  • the height of each section extends over the height of an adjacent nest of tubes 28, 29 constructed as above.
  • the rungs of the ladder 19 are secured to the side walls of the sections 23, 24 while extending both above and below each section such as section 23 or only above each section such as section 24 so as to provide a continuous ladder.
  • the shaft sections 23, 24 are formed with hooks 27 which are cut into the side walls and which are engaged over lugs 26 welded to the side of the tube wall 3. Additionally, if necessary to secure the shaft sections 23, 24 in the suspended state, a spot weld is made between each lug and adjacent hook.
  • each section 23, 24 is provided with a flap 25 which, in the position shown, closes the shaft and simultaneously serves as a floor which a person can enter into the space above the nests of tubes 28, 2.9.
  • the nests of tubes are carried on supporting tubes 31, 32 which are disposed in groups in a staggered arrangement with respect to each other. Thus, a person is able to pass easily from the shaft 12 into the space above a nest of tubes.
  • the flap 25 in the section 24 is raised into the dashed line position so that one can climb down into the section 23. From here, the persons can move into the space above the nest of tubes 28.
  • this access shaft is accessible from above in a suitable manner (not shown), such, for example, as described above, with a closeable aperture provided in the flue cover. Further, instead of installing the shaft sections in alignment, the shaft sections can be disposed in a staggered arrangement.
  • the access shaft of the invention is not limited to steam generators of the tower-type but also can be incorporated in steam generators having a flue disposed in parallel relation alongside a combustion chamber. Further, the access shaft can also be used in a horizontally disposed flue.
  • access shafts have been described as being entered from above through the flue cover, entry can also be obtained from the bottom, for example, through the ash hopper or through a burner nozzle. Also, instead of disposing the access shaft along the side Wall of the flue, the access shaft can be disposed centrally in the flue. This has the advantage that the walls of the shaft are subjected to an even heat loading over their entire surface.
  • the invention thus provides a steam generator with an access shaft for entering into the spaces between the heating surfaces which is void of any lateral ingress apertures in the exterior walls of the flue. Therefore, the need for special tube constructions which would otherwise have to be provided in the vicinity of the ingress apertures is not required. Hence, the tube lining of the flue walls can be economically manufactured. This is especially advantageous where the tubes of the tube lining are welded together in a gas tight manner.
  • a further advantage of the invention resides in the fact that leaks can no longer occur in the flue Walls. Also, because special shaping of the tubes is avoided, the difficulties arising from additional stressing of the tubes clue to differing elastic behavior of the tubes are also avoided.
  • said means includes a plurality of flaps movably secured in said pipe for closing each of said apertures therein in one position and for closing off said shaft to a flow of flue gas therethrough in another position.
  • said access shaft consists of a plurality of spaced pipe sections, each said section extending along the height of one of said nests of tubes and said means includes a flap in each section for closing said section to the passage of flue gas therethrough.
  • said shaft consists of a pipe suspended from one of said tube lined walls, said one wall defining a side of said access shaft.
  • said steam generator includes a flue cover over said walls and said shaft passes through said cover and includes a closeable cover for permitting entry into said shaft.
  • each of said walls includes a plurality of tubes secured together in gas tight relation.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Incineration Of Waste (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Devices For Medical Bathing And Washing (AREA)
US691258A 1966-12-23 1967-12-18 Steam generator having a flue and an access shaft Expired - Lifetime US3448726A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1852766A CH442359A (de) 1966-12-23 1966-12-23 Dampferzeuger mit Rauchgaszug

Publications (1)

Publication Number Publication Date
US3448726A true US3448726A (en) 1969-06-10

Family

ID=4433602

Family Applications (1)

Application Number Title Priority Date Filing Date
US691258A Expired - Lifetime US3448726A (en) 1966-12-23 1967-12-18 Steam generator having a flue and an access shaft

Country Status (7)

Country Link
US (1) US3448726A (de)
BE (1) BE708368A (de)
CH (1) CH442359A (de)
DE (1) DE1526922A1 (de)
ES (1) ES348357A1 (de)
GB (1) GB1153360A (de)
NL (1) NL6700880A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3675628A (en) * 1969-10-16 1972-07-11 Steinmueller Gmbh L & C Wall elements for steam generators
US20180045402A1 (en) * 2015-03-24 2018-02-15 Mitsubishi Hitachi Power Systems, Ltd. Boiler

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2310801A (en) * 1938-07-16 1943-02-09 Babcock & Wilcox Co Steam generator
US2654352A (en) * 1952-02-28 1953-10-06 Combustion Eng Steam generator support and casing structure of box column construction
US3229672A (en) * 1960-12-28 1966-01-18 Stein & Roubaix Boiler and a boiler element with combustion under pressure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2310801A (en) * 1938-07-16 1943-02-09 Babcock & Wilcox Co Steam generator
US2654352A (en) * 1952-02-28 1953-10-06 Combustion Eng Steam generator support and casing structure of box column construction
US3229672A (en) * 1960-12-28 1966-01-18 Stein & Roubaix Boiler and a boiler element with combustion under pressure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3675628A (en) * 1969-10-16 1972-07-11 Steinmueller Gmbh L & C Wall elements for steam generators
US20180045402A1 (en) * 2015-03-24 2018-02-15 Mitsubishi Hitachi Power Systems, Ltd. Boiler
US10330309B2 (en) * 2015-03-24 2019-06-25 Mitsubishi Hitachi Power Systems, Ltd. Boiler

Also Published As

Publication number Publication date
BE708368A (de) 1968-06-21
CH442359A (de) 1967-08-31
NL6700880A (de) 1968-06-24
DE1526922A1 (de) 1970-04-02
ES348357A1 (es) 1969-03-01
GB1153360A (en) 1969-05-29

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