EP0209626B1 - Paroi d'eau résistant à l'érosion - Google Patents

Paroi d'eau résistant à l'érosion Download PDF

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Publication number
EP0209626B1
EP0209626B1 EP19850305173 EP85305173A EP0209626B1 EP 0209626 B1 EP0209626 B1 EP 0209626B1 EP 19850305173 EP19850305173 EP 19850305173 EP 85305173 A EP85305173 A EP 85305173A EP 0209626 B1 EP0209626 B1 EP 0209626B1
Authority
EP
European Patent Office
Prior art keywords
waterwall
stud
tube
stud member
exposed surface
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
Application number
EP19850305173
Other languages
German (de)
English (en)
Other versions
EP0209626A1 (fr
Inventor
Richard C. Johnson
Leigh B. Egbert
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.)
Foster Wheeler Energy Corp
Original Assignee
Foster Wheeler Energy Corp
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
Priority to US06/550,700 priority Critical patent/US4554967A/en
Application filed by Foster Wheeler Energy Corp filed Critical Foster Wheeler Energy Corp
Priority to EP19850305173 priority patent/EP0209626B1/fr
Priority to DE8585305173T priority patent/DE3580361D1/de
Publication of EP0209626A1 publication Critical patent/EP0209626A1/fr
Application granted granted Critical
Publication of EP0209626B1 publication Critical patent/EP0209626B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • 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
    • F22B37/106—Studding of tubes

Definitions

  • This invention relates to a waterwall and, more particularly, to a waterwall that has been provided with a surface that is resistant to erosion caused by particulate material.
  • the present invention is directed at a waterwall that is erosion resistant yet does not affect the heat absorption rates of the waterwall. It also seeks to do so in such a matter that does not prohibitively increase the weight and cost of the system.
  • a waterwall according to the invention comprises a plurality of water tubes extending in a spaced parallel relationship; a plurality of continuous fins extending between adjacent tubes for the length thereof and connected to the outer surfaces of the tubes to form a gas-tight structure; and a plurality of stud members attached to the exposed surface at one side of the structure, the stud members being disposed over the exposed surface of each tube in the structure.
  • Each stud member is formed with a portion projecting towards the exposed surface, each stud member and projecting portion being a solid body of circular cross-section, with the diameter of the projecting portion being less than that of the stud member.
  • the stud member is surrounded by a ceramic sleeve, with a part of each sleeve being held around the projecting portion and between the stud member and the surface of the tube, and the distal end of each portion is welded to the said exposed surface to anchor the stud member and the ceramic sleeve thereto.
  • reference numeral 10 refers in general to a conventional waterwall before it has been modified according to the present invention.
  • the waterwall is formed by a plurality of spaced, parallel water tubes 12 extending for the length of the wall.
  • a pair of continuous fins 14 extend from diametrically opposed surfaces of each tube 12.
  • Each fin 14 is welded along its edge portion to the corresponding surfaces of the adjacent tubes 12 to form a gas tight structure.
  • FIG. 2 A portion of the surface of the waterwall 10 that is exposed to heated particulate material is depicted in Figure 2 in connection with a tube 12 and the two fins 14 extending therefrom.
  • a plurality of stud members are disposed in a spaced relationship along the exposed surfaces of the tube 12 and the fins 14.
  • the stud member are formed by an inner, rod-like member 22 surrounded by a ceramic sleeve 24.
  • a portion 22a of the inner member 22 projects downwardly from the ceramic sleeve 24 for melting during welding of the stud member to the exposed surface of the tube 12 and the fins 14.
  • the inner members 22 thus functions to anchor the ceramic sleeves down in the position shown in Figure 2 and, in addition, provides steel to weld the stud member, including the ceramic sleeve 24 to the outer exposed surface of the tube 12 and the fins 14.
  • the stud members are preferably made of steel which is welded to the exposed surfaces of the waterwall 10 as described.
  • each tube is at least five times greater than the diameter of the stud members and the spacing between adjacent stud members is between one- fourth of an inch (0.64cm) to one inch (2.54cms).
  • the diameter of a tube 12 can be three inches (7.62cms) while the diameter of each stud member is one-half inch (1.27cms), it being understood that these dimensions can vary with different designs.
  • the arrangement of the present invention enjoys several advantages.
  • the irregular shape formed by the stud members in the described embodiment disrupts the abrasive particulate flow and lowers the erosive potential when the particles impact with each other or are deflected away from the underlying structure.
  • the closely spaced stud members may also serve as traps for the particulate material which protects the underlying steel in the areas of severe erosive activity.
  • the invention enables the metal surface thickness to be selectively increased in localized, erosion prone areas of the waterwall as required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Revetment (AREA)

Claims (4)

1. Paroi remplie d'eau comportant plusieurs tubes à eau (12) s'étendant parallèlement et espacés les uns des autres; plusieurs ailettes continues (14) s'étendant entre les tubes adjacents (12) sur la longueur de ceux-ci et reliées aux surfaces extérieures des tubes pour former une structure étanche aux gaz; et plusieurs éléments formant crampons (22) fixés à la surface exposée, d'un côté de la structure, les éléments forment crampons (22) étant disposés sur ladite surface exposée de chacun des tubes (12) de la structure, caractérisée en ce que chaque élément formant crampon (22) comporte une portion (22a) faisant saillie vers ladite surface exposée, chaque élément formant crampon (22) et chaque portion saillante (22a) constituant un corps monobloc de section transversale circulaire, et le diamètre de la partie saillante (22a) étant inférieur à celui de l'élément formant crampon (22), l'élément formant crampon (22) est entouré par un manchon en céramique (24), une partie de chaque manchon en céramique (24) étant maintenue autour de la portion saillante (22a) et entre l'élément formant crampon (22) et la surface du tube (12), et l'extrémité distale de chaque portion (22a) est soudée à ladite surface exposée pour ancrer à celle-ci l'élément formant crampon (22) et le manchon en céramique (24).
2. Paroi remplie d'eau selon la revendication 1, caractérisée en ce que les éléments formant crampons (22) et les manchons (24) sont faiblement espacés et s'étendent sur toute la surface exposée de chaque tube (12).
3. Paroi remplie d'eau selon la revendication 1 ou 2, caractérisée en ce que le diamètre de chaque tube (12) est au moins cinq fois supérieur au diamètre de chaque élément formant crampon (22) disposé sur lui.
4. Paroi remplie d'eau selon la revendication 3, caractérisée en ce que le diamètre de chaque tube (12) est sensiblement de 7,6 cm (3 pouces) et le diamètre de chaque organe (22) est sensiblement de 1,25 cm (0,5 pouces).
EP19850305173 1983-11-10 1985-07-19 Paroi d'eau résistant à l'érosion Expired EP0209626B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US06/550,700 US4554967A (en) 1983-11-10 1983-11-10 Erosion resistant waterwall
EP19850305173 EP0209626B1 (fr) 1985-07-19 1985-07-19 Paroi d'eau résistant à l'érosion
DE8585305173T DE3580361D1 (de) 1985-07-19 1985-07-19 Erosionsfeste wasserwand.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19850305173 EP0209626B1 (fr) 1985-07-19 1985-07-19 Paroi d'eau résistant à l'érosion

Publications (2)

Publication Number Publication Date
EP0209626A1 EP0209626A1 (fr) 1987-01-28
EP0209626B1 true EP0209626B1 (fr) 1990-10-31

Family

ID=8194295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850305173 Expired EP0209626B1 (fr) 1983-11-10 1985-07-19 Paroi d'eau résistant à l'érosion

Country Status (2)

Country Link
EP (1) EP0209626B1 (fr)
DE (1) DE3580361D1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1426638B2 (de) * 1964-06-23 1971-07-22 L & C Steinmuller GmbH, 5270 Gum mersbach Stahlstift fuer die bestiftung von kesselrohren und ver fahren zur herstellung solcher stifte
US3476180A (en) * 1967-06-30 1969-11-04 Exxon Research Engineering Co Studded heat exchanger tubes
JPS4945463B1 (fr) * 1969-01-24 1974-12-04
US3885529A (en) * 1970-03-02 1975-05-27 American Standard Inc Heat exchanger structure for a compact boiler and the like
DE2724336C2 (de) * 1977-05-28 1979-03-29 Didier-Werke Ag, 6200 Wiesbaden Rohrheizflächenwand mit Stiften
DE2903569C2 (de) * 1979-01-31 1984-08-16 Didier-Werke Ag, 6200 Wiesbaden Rohrheizflächenwand
US4226584A (en) * 1979-04-02 1980-10-07 O'connor Engineering Laboratories, Inc. Rotary combustor wall
US4554967A (en) * 1983-11-10 1985-11-26 Foster Wheeler Energy Corporation Erosion resistant waterwall

Also Published As

Publication number Publication date
EP0209626A1 (fr) 1987-01-28
DE3580361D1 (de) 1990-12-06

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