EP2080951A1 - Panneau mural avec eau de chaudière - Google Patents

Panneau mural avec eau de chaudière Download PDF

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Publication number
EP2080951A1
EP2080951A1 EP07741879A EP07741879A EP2080951A1 EP 2080951 A1 EP2080951 A1 EP 2080951A1 EP 07741879 A EP07741879 A EP 07741879A EP 07741879 A EP07741879 A EP 07741879A EP 2080951 A1 EP2080951 A1 EP 2080951A1
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EP
European Patent Office
Prior art keywords
panel
portions
tubular
web
panel body
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Withdrawn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
EP07741879A
Other languages
German (de)
English (en)
Other versions
EP2080951A4 (fr
Inventor
Kazunari Itai
Akihiro Takeya
Yoshinobu Sochi
Michio Tanabe
Yoichi Matsubara
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.)
Dai Ichi High Frequency Co Ltd
Flourshing Enterprise Co Ltd
Original Assignee
Dai Ichi High Frequency Co Ltd
Flourshing Enterprise Co Ltd
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 Dai Ichi High Frequency Co Ltd, Flourshing Enterprise Co Ltd filed Critical Dai Ichi High Frequency Co Ltd
Publication of EP2080951A1 publication Critical patent/EP2080951A1/fr
Publication of EP2080951A4 publication Critical patent/EP2080951A4/fr
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • F22B37/101—Tubes having fins or ribs
    • F22B37/102—Walls built-up from finned 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
    • F22B37/04—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler and characterised by material, e.g. use of special steel alloy

Definitions

  • the present invention relates to a boiler waterwall panel constituting a furnace housing with cooling water passages.
  • This boiler waterwall panel is a plate-pipe composite panel to be used as an element member at the time of forming a wall panel constituting a housing of a furnace (combustion chamber-cum-heat exchanger) as the core of a water heating boiler.
  • a plurality of boiler waterwall panels are joined by welding vertically and horizontally to constitute a furnace housing.
  • one surface of the boiler waterwall panel is covered with an alloy, e.g. a self-fluxing alloy of nickel series.
  • Fig. 3(a) is a side view showing metal tubular members 21 and metal plate members 22;
  • Fig. 3(b) is a cross-sectional view thereof;
  • Fig. 3(c) is a cross-sectional view of a water-cooling panel segment 20.
  • cross-section denotes a cross-section perpendicular to a tubular axial direction.
  • the metal tubular member 21 and the metal plate member 22 are separately produced by the number required to constitute a panel by alternately arranging them. At the time of the production, they are configured to have the same length (see Figs. 3(a) and 3(b) ). Then (see Fig. 3(c) ), a first metal plate member 22 is placed on a first metal tubular member 21 in a direction that the first metal plate member 22 extending in the tubular axial direction. In this state, one long side of the metal plate member 22 is linearly joined by welding to the peripheral surface of the metal tubular member 21. Then, another metal plate member 22 is placed on the other peripheral side of the first metal tubular member 21 in a direction that the metal plate member 22 extending in the tubular axial direction.
  • one long side of the metal plate member 22 is linearly joined by welding to the peripheral surface of the metal tubular member 21.
  • another metal tubular member 21 is placed on the joined metal plate member 22 and another long side of the metal plate member 22 and the peripheral surface of the metal tubular member 21 are linearly joined by welding.
  • the above welding connection is repeatedly performed to obtain a panel member with cooling water passages which is a panel body of the water-cooling panel segment 20.
  • an alloy coating with self-fluxing alloy such as a Ni-Cr based, is formed on one side or both sides of each piece of the panel bodies.
  • a water-cooling panel segment 20 is provided.
  • the coating is formed by a thermal spraying with post fusing method.
  • a coating material layer is formed on an external surface of the water-cooling panel segment 20 by a thermal spraying method, and then a fusing treatment is performed.
  • the panel body has a welded structure in which the transition portion 23 ranging from the metal tubular member 21 to the metal plate member 22, is formed by welding.
  • FIG. 4(a) is a side view of a metal tube 31 and vertical fins 32; Fig. 4(b) is a cross-sectional view thereof; Fig. 4(c) is a cross-sectional view of a finned tubular member; Fig. 4(d) is a side view of a unit members 40 for a water-cooling panel segment; Fig. 4(e) is a cross-sectional view thereof; and Fig. 4(f) is a cross-sectional view of a water-cooling panel segment 50.
  • one piece of the metal tube 31 to be served as a cooling water passage and two sheets of the vertical fins 32 to be served as webs constitute one set, but each of them is produced separately (see Figs. 4(a) and 4(b) ).
  • the number of sets required to form a water-cooling panel segment 50 are configured to have the same length.
  • each set a pair of vertical fins 32 are placed on peripheral opposite sides of the metal tube 31 with the fins extending in the tubular axis direction.
  • One long side of each vertical fin 32 and the peripheral surface of the metal tube 31 are linearly joined by welding.
  • a finned tubular member 30 comprising a metal tube 31 and a pair of vertical fins 32 placed on both peripheral sides and extending in the tubular axis direction can be produced.
  • a finned tubular member 30 also has a welded structure in which the transition portion 33 ranging from the metal tube 31 to the vertical fin 32 is formed by welding.
  • each finned tubular member 30 a alloy coating 41 with of self-fluxing alloy, such as Ni-Cr based, is formed on one side surface of the tubular member 30.
  • a unit member 40 for a water-cooling panel segment is produced.
  • the coating is also formed by a thermal spraying with post fusing method, the treating object is segmentalized. That is, the treatment is performed not to the assembled water-cooling panel segment 50 but to the not-yet-assembled unit member 40 of the water-cooling panel segment 50.
  • a plurality of such unit members 40 for a water-cooling panel segment 50 as units are joined by welding at their tip ends of the vertical fins 32 as joint portions 51.
  • the water-cooling panel segment 50 is formed.
  • the transition portion 23 ranging from the metal tubular portion 21 to the metal plate portion 22 is a welded structure formed by welding.
  • the transition portion ranging from the tubular portion to the plate shaped fin portion is a welded portion, the quality of the welding exerts a great influence on the quality of the boiler waterwall panel.
  • the tubular portion and the fin portion are exposed to a high temperature environment, the tubular portion is cooled from the inside with water or steam, but the fin portion is not cooled.
  • a steep temperature gradient i.e., a steep thermal strain driving force, is generated at the transition portion.
  • the welding of the transition portion is not perfect, e.g., if there is any welding defect such as, e.g.
  • Defects of the welded portion are hard to be found through visual examination and therefore dye penetrant testing should be employed to find such weld defects.
  • the repair of the found welding defects requires troublesome works, such as, e.g. blasting treatment and then TIG welding.
  • a technical object is to improve the construction/formation of the boiler waterwall, panel to reduce the burden of welding operation at the time of producing the boiler waterwall panel and to reduce the burden of maintaining a furnace housing consist of the boiler waterwall panels thereby to improve the operating rate of the boiler.
  • a boiler waterwall panel comprises a metal panel member with water passages as a panel body equipped with plural rows of tubular portions to serve as cooling water passages, web portions connecting the rows of tubular portions, and a pair of fin portions located at the outside of the outermost tubular portions and extending in a tubular axial direction, at least one surface of the panel body being covered with a fusion-bonded coating of a corrosion resistant alloy, wherein the panel member with water passages as the panel body, comprises a plurality of metal seamless finned single tubes as constituent units, each provided with a single tubular portion and a pair of fin portions disposed at peripheral opposite sides of the single tubular portion, the single tubular portion and the fin portions exist sharing a common metal phase continuously extended, and wherein the plurality of metal seamless finned single tubular portions are joined by welding with each other at tip ends of the fin portions of the constituent units so that a welded portion is located at a median line position of
  • the boiler waterwall panel according to the present invention (claim 2) comprises a metal panel member with water passages as a panel body equipped with a plurality of rows of tubular portions to serve as cooling water passages, web portions connecting the rows of tubular portions, and a pair of fin portions located at the outside of the outermost tubular portions and extending in a tubular axial direction, at least one surface of the panel body being covered with a fusion-bonded coating of a corrosion resistant alloy, wherein the panel member with water passages as the panel body comprises a plurality of seamless metal finned tube-web assemblies as constituent units, each having a few rows of tubular portions corresponding to a part of the plural rows of the tubular portions, a web portion connecting said few rows of the tubular portions, and a pair of fin portions provided at outer sides of the outermost tubular portions, the tubular portions, the web portions and the fin portions exist sharing a common metal phase continuously extended, and wherein the plurality of metal seamless finned tube-web assemblies are joined by welding with each other at tip ends
  • the boiler waterwall panel according to the present invention (claim 3) comprises a metal panel member with water passages as a panel body equipped with a plurality of rows of tubular portions as cooling passages, web portions connecting the rows of tubular portions, and a pair of fin portions located at the outside of the outermost tubular portions and extending in a tubular axial direction, at least one surface of the panel body being covered with a fusion-bonded coating of a corrosion resistant alloy, wherein the panel member with water passages as the panel body has a seamless integrated structure in which an entirety of the panel member is constituted by a single metal seamless finned tube-web assembly comprising the plurality of rows of the tubular portions, the web portions connecting the rows of tubular portions, and the pair of fin portions located at the outside of the outermost tubular portions, wherein the tubular portions, the web portions and the fin portions exist sharing a common metal phase continuously extended.
  • the boiler waterwall panel according to the present invention (claim 4) is the boiler waterwall panel as recited in claims 1 to 3, wherein an external surface of a transition portion ranging from the tubular portion to the fin portion or the web portion of the panel member as the panel body is formed into a concave surface.
  • the boiler waterwall panel according to the present invention (claim 5) is the boiler waterwall panel as recited in claims 1 to 4, wherein the seamless finned tubular member or the seamless finned tube-web assembly, each being formed with the single common metal phase, constituting the panel body, is produced by a seamless forming method such as a hot extrusion method.
  • the boiler waterwall panel according to the present invention (claim 6) is the boiler waterwall panel as recited in claims 1 to 5, wherein the corrosion resistant alloy constituting the fusion-bonded coating is made of a Ni-rich Ni-Cr based alloy in which an amount of boron is restricted to 0.1 mass % or below and an amount of silicon is restricted to 0.5 mass % or less at a frame-like region including edge portions of the panel.
  • the transition portion ranging from the tubular portion to the fin portion is not required to be welded. Furthermore, the welding of the tip ends of the fin portions can be performed more easily than the welding of the transition portion, and the welded portion is higher in quality. This reduces the burden of the welding operation for producing the boiler waterwall panel.
  • the fusion-bonded coating is free from the influence of the notch due to unevenness of the welding of this portion. Furthermore, since the welded portion formed in the middle of the web portion instead of the welded portion of the transition is high in quality, damages of the fusion-bonded coating can be remarkably reduced, resulting in a remarkably reduced necessity of the maintenance, which in turn results in stable operation and an improved operation rate of the boiler with furnace housing.
  • the external surface of the transition portion ranging from the tubular portion to the fin portion or the web portion in the panel member is formed into a concave surface, the stress concentration thereto can be reduced. Furthermore, since the cross-section of this portion has a configuration gradually increasing in thickness towards the basal portion, resulting in an enhanced rigidity of this portion, undesired effects by the stress due to the aforementioned steep temperature gradient can be reduced, which enhances the aforementioned preferable functions and results.
  • the concave surface can be easily formed by a seamless forming method, such as e.g., a hot extrusion method, which in turn contributes a longer operating life of an extruding die for use in a hot extrusion method, etc.
  • a seamless forming method such as e.g., a hot extrusion method, which in turn contributes a longer operating life of an extruding die for use in a hot extrusion method, etc.
  • the curvature radius of the concave surface to be formed on the external surface of the transition portion ranging from the tubular portion to the fin portion is set to 3 mm or more.
  • the stress concentration can be sufficiently reduced and the rigidity can be remarkably increased.
  • the notch function against the fusion-bonded coating can be sufficiently reduced by a radius of 3 mm or more.
  • the seamless finned single tube or finned tube-web assembly of a continuous phase constituting the panel body is produced by a seamless forming method, such as e.g., a hot extrusion method, the integration as the continuous phase can be performed assuredly, and the production can be performed efficiently.
  • a hot extrusion method is the most suitable method of producing a seamless finned single tube or a seamless finned tube-web assembly.
  • a seamless constituent unit, etc., constituting the panel body by another seamless forming method, such as e.g., a powder sintering method, a casting method using a sand mold, or a centrifugal casting method, so long as facility circumstances and cost allowed it.
  • thermal shock crack sensitivity is remarkably reduced than the coating with self-fluxing alloy material in which sufficient B and Si is added, this said sensitivity is enhanced. Therefore, even if a furnace housing is formed by welding the boiler waterwall panels, the problems of thermal shock crack can be eliminated.
  • the corrosion resistant alloy low in thermal shock crack sensitivity it is preferable to use the alloy as recited in claim 6, in terms of the thermal shock crack-vs-cost performance or the availability. Depending on the situation, however, another alloy (e.g., another group alloys defined by JIS 4901, 4902 or ISO 4955, 9723) can be used.
  • Fig. 1 shows a structure and production method of a boiler waterwall panel according to an embodiment of the present invention, wherein Fig. 1 (a) is a side view of a finned tubular member (seamless finned single tube), Fig. 1 (b) is a cross-sectional view thereof, Fig. 1 (c) is a side view of a panel body (panel member with water passages), Fig. 1 (d) is a cross-sectional view thereof, Fig. 1 (e) is a side view of a boiler waterwall panel, and Fig. 1 (f) is a cross-sectional view thereof.
  • Fig. 1 (a) is a side view of a finned tubular member (seamless finned single tube)
  • Fig. 1 (b) is a cross-sectional view thereof
  • Fig. 1 (c) is a side view of a panel body (panel member with water passages)
  • Fig. 1 (d) is a cross
  • Fig. 2 shows a structure and production method of a boiler waterwall panel according to another embodiment of the present invention, wherein Fig. 2(a) is a side view showing a seamless finned tube-web assembly, Fig. 2(b) is a cross-sectional view thereof, Fig. 2(c) is a side view of a panel body (panel member with water passages), and Fig. 2(d) is a cross-sectional view thereof.
  • Fig. 3 shows an example of a conventional water cooling panel segment, wherein Fig. 3(a) is a side view showing metal tubular members and metal plate members, Fig. 3(b) is a cross-sectional view thereof, Fig. 3(c) is a cross-sectional view of a water-cooling panel segment.
  • Fig. 4 shows another example of a conventional water-cooling panel segment, wherein Fig. 4(a) is a side view of a metal tube and vertical fins, Fig. 4(b) is a cross-sectional view thereof, Fig. 4(c) is a cross-sectional view of a finned tubular member, Fig. 4(d) is a side view of unit members for a water-cooling panel segment, Fig. 4(e) is a cross-sectional view thereof, and Fig. 4(f) is a cross-sectional view of the water-cooling panel segment.
  • Fig. 1 (a) is a side view of a finned tubular member 60
  • Fig. 1 (b) is a cross-sectional view thereof
  • Fig. 1 (c) is a side view of a panel body 70
  • Fig. 1 (d) is a cross-sectional view thereof
  • Fig. 2(e) is a side view of a boiler waterwall panel 80
  • Fig. 1 (f) is a cross-sectional view thereof.
  • the cross-section of each cross-sectional view denotes a cross-section perpendicular to the axial direction of the tubular portion 61.
  • This boiler waterwall panel 80 is produced as follows. That is, initially, a tubular member 60, which is a metal seamless finned pipe as the minimum constituent unit, is integrally produced by a hot extrusion method (see Figs. 1 (a) and 1 (b) ). A plurality of finned tubular members 60 are aligned in length, and the tip ends of the fin portions 62 as joining portions are welded with each other to obtain a panel body 70 (see Figs. 1 (c) and 1 (d) ). Thereafter, a fusion-bonded coating of a corrosion resistant alloy is formed on one surface side of the panel body 70 as a treating surface.
  • thermal spraying with post-fusing method and weld overlaying method are mentioned typically, other methods e.g. power-slurry coating with post-fusing method etc. can be employed. That is to say, any method, in which a fusible alloy can be bonded on a metallic substrate with mutual alloying through fusing step thereof, is available.
  • the boiler waterwall panel 80 is produced.
  • the fusion-bonded coating of a corrosion resistant alloy according to the boiler waterwall panel 80 is formed by the following steps (see Figs. 1 (e) and 1 (f) ). For example, an alloy having no thermal shock crack sensitivity is applied to the frame-like region 81 including edge portion of the treating surface by a weld overlaying method.
  • an alloy good in workability such as, e.g., Ni series (Ni-Cr group, etc.) or Co series (Co-Cr group, etc.) self-fluxing alloy, or an alloy in which WC is added to the above alloy, etc., are applied by a thermal spraying with post fusing method.
  • the finned tubular member 60 (see Figs. 1 (a) and 1 (b) ) is a metal elongated member having a tubular portion 61 serving as a cooling water passage and a pair of fin portions 62 provided at peripheral opposite sides of the tubular portion so as to extend in the tubular member axial direction.
  • a transition portion 63 ranging from the tubular portion 61 to the fin portion 62 is not a welded portion but an integral portion formed by a hot extrusion method.
  • the external surface of the transition portion 63 is formed into a concave curve having a curvature radius of 3 mm to 6 mm at the minimum curvature radius portion.
  • the finned tubular member 60 is commonly made from a rolled member of cheap carbon steel or low-alloy steel (e.g., Cr-Mo steel), but the material can be stainless steel, casting material, or another metal.
  • the dimensional data is, for example, about 60 to 80 mm in diameter of the tubular portion 61, about 5 to 7 mm in thickness of the tubular portion 61, about 10 to 20 mm in width of the fin portion 62, and about 5 to 7 mm in thickness of the fin portion 62.
  • the hot extrusion method the Ugine-Sejournet method using glass as lubricant agent is popular, but any method can be employed.
  • the panel body 70 (see Figs. 1 (c) and (d) ) is produced by welding a plurality of the aforementioned finned tubular members 60. Concretely, for example, about 5 to 20 pieces of the finned tubular members 60 are arranged in parallel with the length aligned, and the tip ends of the adjacent fin portions 62 are welded to obtain a flat shaped member. In the case of a commonly used boiler furnace panel, a general size of the panel body 70 is about 4,000 to 8,000 mm in length and about 400 to 1,200 mm in width.
  • the welding connection of the joint 71 in the panel body 70 is performed by a common welding method, such as e.g., a CO 2 arc welding method or a TIG welding method.
  • the butt welded fin portions 62 and 62 constitute a web portion connecting the tubular portions 61 and 61, and the joint 71 which is a welded portion is located at the median line position of the web.
  • the boiler waterwall panel 80 (see Figs. 1 (e) and 1 (f) ) is finished by forming a frame-like portion fusion-bonded coating 81 and an inner region fusion-bonded coating 82 on the aforementioned panel body 70.
  • a corrosion resistant alloy having no thermal shock crack sensitivity to be used as the frame-like portion fusion-bonded coating 81 a Ni-rich Ni-Cr based alloy in which the amount of boron B as a melting-point lowering element is restricted to 0.1 mass % or below and the amount of silicon Si as a melting-point lowering element is restricted to 0.5 mass % or less can be exemplified.
  • JIS G4901 for bar members, JIS G4902 for plate members can be exemplified in Japan, and ISO 4955 or ISO 9723 can be exemplified in the International Standard.
  • the thickness of the frame-like portion fusion-bonded coating 81 is about 1 to 3 mm.
  • the frame-like portion of the panel body 70 it is important that the frame-like portion has no thermal shock crack sensitivity because it is subjected to be welded to another panel after it becomes a boiler waterwall panel 80.
  • the easiness and/or cost of the coating treatment is given more importance since the region is not to be welded anymore.
  • Ni-Cr group self-fluxing alloy As the corrosion resistant alloy to be used for the inner region fusion-bonded coating 82, a Ni-Cr group self-fluxing alloy can be exemplified because it is suitable to the thermal spraying with post-fusing method and excellent in applicability.
  • the Ni-rich Ni-Cr component occupies the predominant quantity, the amount of B and that of Si are regulated to 1 to 5 mass %, respectively, so as to provide an easy-to-melt nature, a self-fluxing function etc., preferable to a thermal spraying treatment or a fusing treatment while avoiding excessive increase of brittleness.
  • nickel self-fluxing alloy material defined by Japanese Industrial Standard JIS H8303 or International Standard ISO 4920 can be exemplified.
  • the thickness of the inner region fusion-boned coating 82 is usually set to about 0.5 to 3.0 mm.
  • the coating having a thickness of 0.2 mm or above can give sufficient corrosion prevention.
  • the inner region fusion-bonded coating 82 in the fusing treatment to be performed after thermally spraying the inner region fusion-bonded coating 82 on one surface of the panel body 70, it is more preferable to correct deformation of the panel body 70 by regulating the displacements in the dual direction perpendicular to the longitudinal direction at plural points with a positional correction tool while pulling the panel body 70 in the longitudinal direction with a pulling tool during the heating while heating the panel body 70 with a manner in which a partially heating tool, e.g., an induction coil, being moved in the longitudinal direction.
  • a partially heating tool e.g., an induction coil
  • the boiler waterwall panel 80 produced as mentioned above will be transported from a panel production factory to a boiler installation site, and joined by welding to another panel at frame-like portions to be fabricated in a furnace housing.
  • Fig. 2(a) is a side view showing seamless finned tube-web assembly 90
  • Fig. 2(b) is a cross-sectional view thereof
  • Fig. 2(c) is a side view of a panel body 95 (panel member with water passages)
  • Fig. 2(d) is a cross-sectional view thereof.
  • the "cross-section" of each cross-sectional view denotes a cross-section perpendicular to the axial direction of the tubular portion 91.
  • This boiler waterwall panel is different from the aforementioned boiler waterwall panel 80 in that the constituent unit of the panel body 95 which is a panel member with water passages as a panel body is constituted by seamless finned tube-web assemblies 90.
  • the seamless finned tube-web assembly 90 is equipped with a few rows of tubular portions 91, web portions 92 connecting the rows of tubular portions and a pair of fin portions 93 located at the outside of the outermost rows of the tubular portions 91, which are connected as a continuous phase.
  • the assembly 90 is integrally formed by a hot extrusion method.
  • a few tubular portions 91 are included in a plane in a parallel arranged manner as if a part of the panel is previously assembled by arranging the finned tubular members 60.
  • the tubular portion 91 to be served as a cooling water passage can be the same as the aforementioned tubular portion 61
  • the fin portion 93 can be the same as the fin portion 62
  • the web portion 92 can have a size almost equal to the size corresponding to two fin portions 93
  • the transition portion 94 ranging from the tubular portion 91 to the web portion 92 or the fin portion 93 can be the same as the transition portion 63.
  • the few rows of the tubular portions 91 contained in the seamless finned tube-web assembly 90 correspond to a part of plural rows of the tubular portions 91 contained in the panel body 95 or the boiler waterwall panel.
  • an assembly having three rows of tubular portions is illustrated, but the number of rows of tubular portions can be two, four, or more.
  • the panel body 95 can be formed by welding a plurality of seamless finned tube-web assemblies 90 in the same manner as in the panel body 70. Concretely, tip ends of the adjacent fin portions 93 are welded to be assembled into a flat panel. In the web formed by welding the fin portions 93 and 93, the joint 96 which is a welded portion is located at the median line position of the web. However, at the time of producing the seamless finned tube-web assembly 90, since no joint 96 exists at the web portion 92 integrally formed together with the tubular portion 91, the panel body 95 has a welding structure in which a welded portion is located at the median line positions of some web portions among web portions connecting the plural rows of tubular portions 91 to be served as cooling passages. A pair of fin portions 93 are located at the outside of the outermost tubular members.
  • a frame-like portion fusion-bonded coating 81 and inner region fusion-bonded coating 82 are formed on the panel body 95 having the aforementioned welding structure produced as mentioned above into a boiler waterwall panel.
  • the number of joints 96 in the panel body 95 is fewer than the number of joints 71 in the panel body 70.
  • the boiler waterwall panel produced as mentioned above will also be transported from a panel production factory to a boiler installation site, and joined by welding to another panel at frame-like portions to be fabricated in a furnace housing.
  • This embodiment is a deformation of the aforementioned second embodiment. If this embodiment is explained using Fig. 2 showing the structure or the panel body according to the second embodiment, this is an embodiment in which the joint 96 in the panel body 95 is eliminated.
  • the number of rows of the tubular portions 91 in the seamless finned tube-web assembly 90 which is a panel constituent unit of the second embodiment is increased to the number of rows of the tubular portions 91 in the panel body 95.
  • the seamless finned tube-web assembly 90 constitutes not a panel constituent unit but an entire panel structural member.
  • This embodiment is useful for the case in which the panel body 95 is relatively small in width (e.g., 400 to 600 mm width /3 to 6 rows of tubular portions).
  • the preferable applicable target will be expanded to a wider panel.
  • the seamless finned single tube 60 and the seamless finned tube-web assembly 90 are produced by a hot extrusion method.
  • a seamless member production method of producing an integral member in which tubular members and fins or webs extending in the tubular axial direction are united with a continuous metal phase to be replaced with a hot extrusion method a powder sintering method, a casting method using a sand mold, and a centrifugal casting method can be exemplified.
  • the frame-like portion fusion-bonded coating 81 of a low thermal shock crack sensitivity alloy is formed by a weld overlaying method.
  • the coating can be formed by another method, such as e.g., a thermal spraying with post-fusing method, the frame-like portion fusion-bonded coating 81 can be formed by such a method.
  • the boiler waterwall panel of the present invention can be applied to various boiler furnace housings including the so-called super boiler.
  • an incinerator can be exemplified.
  • An incinerator of a garbage incineration power generation equipment is also included in the installation example.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Revetment (AREA)
EP07741879A 2006-11-06 2007-04-18 Panneau mural avec eau de chaudière Withdrawn EP2080951A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006300962A JP2008116150A (ja) 2006-11-06 2006-11-06 ボイラ水壁用パネル
PCT/JP2007/058443 WO2008056456A1 (fr) 2006-11-06 2007-04-18 Panneau mural avec eau de chaudière

Publications (2)

Publication Number Publication Date
EP2080951A1 true EP2080951A1 (fr) 2009-07-22
EP2080951A4 EP2080951A4 (fr) 2009-12-16

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EP07741879A Withdrawn EP2080951A4 (fr) 2006-11-06 2007-04-18 Panneau mural avec eau de chaudière

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US (1) US20100300379A1 (fr)
EP (1) EP2080951A4 (fr)
JP (1) JP2008116150A (fr)
KR (1) KR20090101322A (fr)
CN (1) CN101379345A (fr)
TW (1) TW200821503A (fr)
WO (1) WO2008056456A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2631322A4 (fr) * 2010-10-22 2015-08-19 Dai Ichi High Frequency Co Ltd Élément de chaudière revêtu d'alliage
EP2360356A3 (fr) * 2009-10-27 2017-07-05 General Electric Company Système de récupération de la chaleur des déchets

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CN101379345A (zh) 2009-03-04
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KR20090101322A (ko) 2009-09-25
TW200821503A (en) 2008-05-16
US20100300379A1 (en) 2010-12-02

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