EP4386260A1 - Procédé et agencement pour la rénovation d'une chaudière - Google Patents

Procédé et agencement pour la rénovation d'une chaudière Download PDF

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Publication number
EP4386260A1
EP4386260A1 EP23213934.5A EP23213934A EP4386260A1 EP 4386260 A1 EP4386260 A1 EP 4386260A1 EP 23213934 A EP23213934 A EP 23213934A EP 4386260 A1 EP4386260 A1 EP 4386260A1
Authority
EP
European Patent Office
Prior art keywords
boiler
roof
roof panels
new
support brackets
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.)
Granted
Application number
EP23213934.5A
Other languages
German (de)
English (en)
Other versions
EP4386260B1 (fr
EP4386260C0 (fr
Inventor
Pekka HURRI
Jan Nickull
Markku Nieminen
Tero Kippola
Jukka Koskelainen
Antti Periviita
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.)
Valmet Technologies Oy
Original Assignee
Valmet Technologies Oy
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 Valmet Technologies Oy filed Critical Valmet Technologies Oy
Publication of EP4386260A1 publication Critical patent/EP4386260A1/fr
Application granted granted Critical
Publication of EP4386260B1 publication Critical patent/EP4386260B1/fr
Publication of EP4386260C0 publication Critical patent/EP4386260C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F22B37/002—Component parts or details of steam boilers specially adapted for nuclear steam generators, e.g. maintenance, repairing or inspecting equipment not otherwise provided for
    • F22B37/006—Walking equipment, e.g. walking platforms suspended at the tube sheet
    • 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
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/14—Supply mains, e.g. rising mains, down-comers, in connection with water tubes
    • F22B37/148—Tube arrangements for the roofs
    • 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
    • F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
    • F22B37/201—Suspension and securing arrangements for walls built-up from 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
    • F22B37/24—Supporting, suspending or setting arrangements, e.g. heat shielding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies

Definitions

  • the invention relates to boilers such as recovery boilers or fluidized bed boilers, and particularly renovating such boilers.
  • An object of the present invention is to provide a new method and arrangement for renovating a boiler.
  • the invention is characterized by what is stated in the independent claims. Some embodiments of the invention are disclosed in the dependent claims.
  • the boiler may be a recovery boiler or a fluidized bed boiler, for example.
  • the boiler comprises a furnace, walls, a roof, and a water and steam system.
  • the roof comprises tubes that are a part of the water and steam system of the boiler.
  • new roof panel means a roof panel that is after renovation positioned in place to replace an old roof panel.
  • Old roof panel means a roof panel that has been in use in the boiler before renovation. Old roof panels are removed, and the new roof panels are positioned in place. The new roof panels are supported by the support brackets. The new roof panels are used as scaffoldings during the renovation.
  • the tubes of the new roof panels are connected to the water and steam system of the boiler to form a part of the water and steam system of the boiler.
  • the renovation is performed smoothly, reliably, and fast because the need for separate scaffoldings is reduced or in some cases even avoided. Furthermore, avoiding separate scaffoldings brings savings in material and transport, for example. Also, scaffolding work in the renovation is minimized. There is no need erect and alter temporary beams and planks which would take a lot of time.
  • the new roof panels are used as scaffoldings during assembling of new superheaters. Thereby the erection of the superheaters and furnace roof may be executed simultaneously in a safe way.
  • the support brackets are removed from the new roof panels after connecting the tubes of the new roof panels. Thereby the roof panels do not comprise extra parts when in use.
  • the support brackets are detachable from the roof panel. Thereby the support brackets are easily removed from the roof panels.
  • the support brackets comprise an upper part and a lower part, which upper part and lower part are preferably cylindrical parts, that are positioned on opposite sides of the roof panel and connected by a bolt.
  • Such roof panels are easily assembled, and they are reliably connected in the roof panels.
  • the cylindrical upper part and lower part are pipes.
  • Such a structure makes the support brackets light in weight and still firm and reliable in structure.
  • the method and the arrangement may be used in connection with a boiler that comprises a furnace, walls, a roof, and a water and steam system.
  • the boiler may be a recovery boiler as disclosed in Figure 1 , or a fluidized bed boiler such as a circulating fluidized bed (CFB) boiler or a bubbling fluidized bed (BFB) boiler, or any other suitable boiler, for example.
  • a fluidized bed boiler such as a circulating fluidized bed (CFB) boiler or a bubbling fluidized bed (BFB) boiler, or any other suitable boiler, for example.
  • Figure 1 shows a recovery boiler 1.
  • the recovery boiler 1 may be e.g. a soda recovery boiler, a black liquor recovery boiler, or a kraft recovery boiler.
  • the recovery boiler 1 comprises a furnace 2. Black liquor to be burnt is fed to the furnace 2. Also, combustion air is fed to the furnace 2.
  • the recovery boiler 1 also comprises walls 3 and a roof 4.
  • the recovery boiler further comprises a water and steam system.
  • the roof 4 comprises tubes that are a part of the water and steam system of the recovery boiler 1.
  • the recovery boiler 1 is also provided with superheaters 5.
  • the superheaters 5 are elements formed by a plurality of parallelly located vertical tubes and provide parallelly in plural number in a transverse direction of the recovery boiler 1.
  • the superheaters 5 contain steam flowing therein and heating up when the tubes are heated by hot flue gases from outside.
  • the roof 4 and the superheaters 5 are heat surfaces of the water and steam system of the recovery boiler 1.
  • water and steam system water or steam or a mixture thereof is flowing.
  • the water and steam system may comprise also other heat surfaces such as screen tubes.
  • the water and steam system may also comprise other components such as a drum or drums, supply headers, pipes and other tubes, for example. However, for the sake of clarity these other heat surfaces and other components are not shown in Figure 1 .
  • the recovery boiler 1 also comprises a nose 6 that guides flow of the flue gases.
  • the recovery boiler 1 may comprise boiler banks and econ-omizers, for example.
  • the recovery boiler 1 may comprise also other parts or components which, however, are not shown in Figure 1 for the sake of clarity.
  • a roof panel 7 is shown in Figures 2 , 3 , and 4 .
  • the roof panel 7 comprises a plurality of parallel tubes 7a that extend from a first end of the panel 7 to the second end of the panel 7.
  • the tubes 7a are connected to each other by plates or walls 7b. Thus two adjacent tubes 7a are connected by a wall 7b.
  • the panel 7 in the Figures has four tubes 7a.
  • the number of tubes 7a in the panel 7 may also be less than four or more than four.
  • brackets 8 are provided with brackets 8.
  • the panel 7 comprises two brackets 8 in both ends of the panel 7.
  • One bracket 8 in each end of the panel 7 would be enough if the bracket is so wide that even one bracket prevents the panel 7 from turning or swinging.
  • Each end of the panel 7 may also comprise more than two brackets 8.
  • the old roof panels are removed. Thereby in the roof a gap is formed.
  • the length of the tubes 7a of the new roof panel is shorter than the gap such that the new roof panels 7 fit to the gap.
  • the brackets 8 extend beyond the ends of the panel 7 such that the length of the unit formed by the panel 7 and the brackets 8 is longer than the gap.
  • the new roof panels are positioned in place in the gap.
  • the new roof panels 7 are supported by the support brackets 8 above the gap.
  • the length of the roof panel 7 may be from 2 to 8 meters, for example.
  • the new roof panels 7 and the brackets 8 are dimensioned such that they can be used as scaffoldings during the renovation.
  • the dimensioning may be made such that the unit with the panel 7 and the brackets 8 sustain the weight of the panel 7 and at least two persons, for example.
  • the new roof panels 7 may then be used as scaffoldings or as an assembling platform for performing service work or renovation.
  • the tubes 7a of the new roof panels 7 may at any phase of the renovation work be connected to the water and steam system of the boiler 1 to form a part of the water and steam system of the boiler.
  • the new roof panels 7 may be used as scaffoldings without connecting the tubes 7a to the water and steam system of the boiler 1.
  • the connecting may be made by welding, for example.
  • the new roof panels 7 may be used as scaffoldings during assembling of new superheaters 5.
  • the superheaters 5 may comprise dozens of tubes that must be renewed. Assembling of new superheaters 5 may be performed also simultaneously with connecting the new roof panels 7. However, it could be beneficial to first assemble some of the superheaters 5 and only thereafter to connect the tubes 7a of the roof panels 7. However, performing different work phases at least partly simultaneously makes the renovation work efficient.
  • the support brackets 8 are removed from the new roof panels 7 after connecting the tubes 7a of the new roof panels 7.
  • the brackets 8 may be lugs that are welded to the roof panels 7.
  • the welding of the brackets 8 to the roof panels 7 must be made carefully such that the tubes 7a of the roof panel 7 are not harmed. Removing welded brackets 8 from the roof panel 7 requires breaking and harming the brackets 8. Therefore, preferably the support brackets 8 are detachable from the roof panel.
  • a detachable support bracket 8 may be removed from the roof panel 7 without breaking or harming the roof bracket 8.
  • Figures 2 to 7 show detachable support brackets 8.
  • the support bracket 8 comprises an upper part 9 and a lower part 10.
  • the upper part 9 is positioned above the roof panel 7 and the lower part 10 is positioned below the roof panel 7.
  • the lower part 10 and the upper part 9 are connected by a bolt 11.
  • the bolt 11 may be secured to its place and the upper part 9 and the lower part 10 may be tightened by a nut 12.
  • a nut is not necessary if the upper part 9 and possibly also the lower part 10 are provided with threads for the bolt 11.
  • a hole is formed to the wall 7b of the roof panel 7 and the bolt 11 is positioned through the panel 7 such that the bracket 8 is installed in place.
  • the upper part 9 is longer than the lower part 10.
  • the upper part 9 and the lower part 10 may be cylindrical. Cylindrical parts accommodate very well to the tubes 7a of the roof panel 7. Thereby the bracket 8 may be attached firmly in connection with the roof panel 7.
  • the cylindrical parts may be made of a solid bar, for example.
  • the cylindrical parts may be pipes.
  • the support bracket can be made durable but simultaneously light in weight.
  • the diameter of the tubes 7a of the roof panel 7 may be from 40 to 80 mm, for example.
  • the distance between adjacent tubes 7a of the roof panel 7 which is thus the width of the wall 7b of the roof panel 7 may be from 10 to 30 mm, for example.
  • the thickness of the wall 7b of the roof panel 7 may be from 5 to 20 mm, for example.
  • the diameter of a cylindrical upper part 9 may be from 40 to 80 mm, for example.
  • the diameter of a cylindrical lower part 10 may be from 35 to 75 mm, for example.
  • the diameter of the upper part 9 may be equal to the diameter of the lower part 10.
  • the diameter of the upper part 9 may be larger than the diameter of the lower part 10.
  • the diameter of the upper part 9 may be smaller than the diameter of the lower part 10.
  • the upper part 9 of the bracket 8 that extends beyond the end of the roof panel 7 is subjected to bending forces. Therefore it is beneficial to form the diameter of the upper part 9 quite large.
  • the lower part 10 of the bracket is at least mainly subjected to pressing force, only. Therefore the diameter of the lower part 10 need not be excessively large.
  • a reasonably small diameter of the lower part 10 provides the effect that there is a useful amount of space under the roof panel 7 to perform welding of the tubes 7a of the roof panel 7 to the to the water and steam system of the boiler 1, for example. Therefore it is beneficial to dimension the upper part 9 and the lower part 10 such that the diameter of the upper part 9 is larger than the diameter of the lower part 10.
  • the wall thickness of such pipe may be from 5 to 15 mm, for example.
  • the diameter of the bolt may be from 5 to 20 mm, for example.
  • the length of the upper part 9 may be from 100 to 300 mm, for example.
  • the length of the lower part 10 may be from 50 to 200 mm, for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
EP23213934.5A 2022-12-14 2023-12-04 Procédé et agencement pour la rénovation d'une chaudière Active EP4386260B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20226105A FI130654B1 (en) 2022-12-14 2022-12-14 Procedure and arrangement for renewing a boiler

Publications (3)

Publication Number Publication Date
EP4386260A1 true EP4386260A1 (fr) 2024-06-19
EP4386260B1 EP4386260B1 (fr) 2026-02-18
EP4386260C0 EP4386260C0 (fr) 2026-02-18

Family

ID=89076369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23213934.5A Active EP4386260B1 (fr) 2022-12-14 2023-12-04 Procédé et agencement pour la rénovation d'une chaudière

Country Status (2)

Country Link
EP (1) EP4386260B1 (fr)
FI (1) FI130654B1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1167476B (de) * 1963-07-31 1964-04-09 Ver Kesselwerke Ag Arbeitsbuehnenaufbau in Feuerungs- und Strahlungsraeumen von Dampferzeugern und Industrieoefen
US4474143A (en) * 1983-08-19 1984-10-02 Combustion Engineering, Inc. Retractable maintenance platform stored outside of the furnace
US5343978A (en) * 1993-04-23 1994-09-06 New York State Electric & Gas Corporation Telescoping scaffolding for maintenance and repair of multi-story, power-generating boiler systems
EP4012257A1 (fr) * 2020-12-08 2022-06-15 Valmet Technologies Oy Support, plate-forme, et procédé d'inspection et/ou de maintenance d'un échangeur de chaleur à tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1167476B (de) * 1963-07-31 1964-04-09 Ver Kesselwerke Ag Arbeitsbuehnenaufbau in Feuerungs- und Strahlungsraeumen von Dampferzeugern und Industrieoefen
US4474143A (en) * 1983-08-19 1984-10-02 Combustion Engineering, Inc. Retractable maintenance platform stored outside of the furnace
US5343978A (en) * 1993-04-23 1994-09-06 New York State Electric & Gas Corporation Telescoping scaffolding for maintenance and repair of multi-story, power-generating boiler systems
EP4012257A1 (fr) * 2020-12-08 2022-06-15 Valmet Technologies Oy Support, plate-forme, et procédé d'inspection et/ou de maintenance d'un échangeur de chaleur à tube

Also Published As

Publication number Publication date
EP4386260B1 (fr) 2026-02-18
FI130654B1 (en) 2024-01-08
EP4386260C0 (fr) 2026-02-18
FI20226105A1 (en) 2024-01-08

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