EP1493968B1 - Membrane wall - Google Patents

Membrane wall Download PDF

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Publication number
EP1493968B1
EP1493968B1 EP04076914A EP04076914A EP1493968B1 EP 1493968 B1 EP1493968 B1 EP 1493968B1 EP 04076914 A EP04076914 A EP 04076914A EP 04076914 A EP04076914 A EP 04076914A EP 1493968 B1 EP1493968 B1 EP 1493968B1
Authority
EP
European Patent Office
Prior art keywords
coating
membrane wall
steam pipe
rvs
welding
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.)
Revoked
Application number
EP04076914A
Other languages
German (de)
French (fr)
Other versions
EP1493968A3 (en
EP1493968A2 (en
Inventor
Huibregt Van Hengel
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.)
VISSER AND SMIT HANAB BV
Original Assignee
VISSER AND SMIT HANAB BV
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
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Application filed by VISSER AND SMIT HANAB BV filed Critical VISSER AND SMIT HANAB BV
Publication of EP1493968A2 publication Critical patent/EP1493968A2/en
Publication of EP1493968A3 publication Critical patent/EP1493968A3/en
Application granted granted Critical
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Classifications

    • 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
    • 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
    • F23M2900/00—Special features of, or arrangements for combustion chambers
    • F23M2900/05001—Preventing corrosion by using special lining materials or other techniques
    • 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
    • F23M2900/00—Special features of, or arrangements for combustion chambers
    • F23M2900/05004—Special materials for walls or lining

Definitions

  • the coat-welding of the RVS is carried out MIG welding and TIG disposed.
  • helical coat-welding means a.o., a weld bead extending continuous in radial circumferential direction in such a helical manner in axial direction, that succeeding windings of the weld bead mutually contact or (slightly) overlap with the adjacent longitudinal edges, such that a continuous coating of substantially constant thickness is provided.
  • the membrane wall is designed for a waste incinerator.
  • the membrane wall serves as sideway limit of the fire space, wherein a temperature in the range of e.g. 700-800°C can prevail.
  • the membrane wall is cooled by the steam running through the vertical upward extending steam pipes.
  • the membrane wall can however also be provided for other incinerators and possibly be cooled by another fluid flowing through the pipes, e.g. water.
  • the membrane wall can be provided as separator wall or as bulk head (at one or both sides exposed to the fire).
  • the same RVS-composition is used for both the coat-welding and the connection strip, having a high corrosion and abrasive strength in relation with the environment within the incinerator.
  • RVS welding material to weld the connection strip to the steam pipe, preferably with a composition substantially equal to that of the RVS applied in the coat-welded clad layer or the connection strip.
  • the coat-welding of the RVS clad layer and/or the attachment of the connection strip to the steam pipe by welding is preferably carried out in a protective environment, e.g. below a powder cover, to avoid environmental attack of the welding material or surrouding steel. This way of protection is known as such and needs therefor no further elaboration.
  • RVS strip The importance of a completely RVS strip is a.o. that therewith one can avoid that during fixing of the steam pipe to the connection strip by welding the carbon contents within the weld seal becomes too high due to diffusion of carbon from the surrouding steel.
  • RVS types contain Fe, C and alloy components and also Ni and Cr.
  • connection strip has a width of about 30 mm at the most. If the width is too large, the connection strip will overheat and early collapse.
  • connection strip must suffice a predetermined straightness and the surface of the RVS welded onto the steam pipe must suffice a predetermined smoothness and layer thickness.
  • the layer thickness is preferably between 1.8 and 2.5 mm.
  • the drawing shows in fig. 1 a part of a membrane wall 1 in perspective. It is made of mutual parallel extending steam pipes 2 of carbon steel, all around coated by clad-welding of RVS. Slod RVS connection strips 3 are welded to the mutually spaced steam pipers 2.
  • the weld connections are refered 4 (four in steam pipe longitudinal direction extending weld connections for each connecting strip 3 between two steam pipes).
  • Fig. 2 shows a steam pipe 2 in detail, showing the helical extending weld bead 5 of the clad-welded RVS coating.
  • the clad-welded coating provides a continuous smooth layer.
  • the strip 3 is made of a composition according to Inconel 625 or 629 or others from the 600- or 700-series. This is also true for the coating or weld connection.
  • the coating of weld connection or strip contains iron (Fe) less than 10 wt%, preferably less than about 7.5 wt%, more preferably less than about 5.5 wt%, such as less than about 7 wt% or about 5 wt%.
  • the weld rod used for welding contains preferably Fe less than 3 wt%, e.g. less than about 1.5 wt%, such as less than about 1

Abstract

Membrane wall of an incinerator of which the steam pipes are made of carbon steel provided with a stainless steel coating, e.g. Inconel 625, by means of helical welding. The co-extending steam pipes are mutually welded together by a connection strip of 100% stainless steel fitted there between. The coating or strip of weld connection contains less than 10 wt% Fe (iron). The used weld rod contains less than 3 wt% Fe. <IMAGE>

Description

  • The invention is concerned with a membrane wall and a steam pipe therefore and is defined by the appended claims. Prior art is disclosed in, o.a., US3, 404, 663 disclosing spray coating, US3, 304, 920 disclosing plug welding or spot welding of a conforming coating sheet and US3 139, 866 disclosing spray coating.
  • It is proposed, to extend the service life of a membrane wall of an incinerator by providing the steam pipes of carbon steel with a stainless steel (RVS) coating by means of helical welding. Subsequently the steam pipes are assembled into a membrane wall by mutually welding the mutually parallel extending steam pipes with a inter fitted connection strip of 100% stainless steel.
  • By helical coat-welding of the stainless steel (e.g. Inconel 625) a sufficiently smooth surface is obtained, which is desirable to weld the RVS coated steam pipe to the RVS (also preferably Inconel 625) connection strip. For an optimised smooth result, the coat-welding of the RVS is carried out MIG welding and TIG disposed.
  • It will be appreciated that helical coat-welding means, a.o., a weld bead extending continuous in radial circumferential direction in such a helical manner in axial direction, that succeeding windings of the weld bead mutually contact or (slightly) overlap with the adjacent longitudinal edges, such that a continuous coating of substantially constant thickness is provided.
  • E.g. the membrane wall is designed for a waste incinerator. The membrane wall serves as sideway limit of the fire space, wherein a temperature in the range of e.g. 700-800°C can prevail. The membrane wall is cooled by the steam running through the vertical upward extending steam pipes. The membrane wall can however also be provided for other incinerators and possibly be cooled by another fluid flowing through the pipes, e.g. water.
  • The membrane wall can be provided as separator wall or as bulk head (at one or both sides exposed to the fire).
  • Preferably the same RVS-composition is used for both the coat-welding and the connection strip, having a high corrosion and abrasive strength in relation with the environment within the incinerator.
  • Preferably use is made of RVS welding material to weld the connection strip to the steam pipe, preferably with a composition substantially equal to that of the RVS applied in the coat-welded clad layer or the connection strip. The coat-welding of the RVS clad layer and/or the attachment of the connection strip to the steam pipe by welding is preferably carried out in a protective environment, e.g. below a powder cover, to avoid environmental attack of the welding material or surrouding steel. This way of protection is known as such and needs therefor no further elaboration.
  • The importance of a completely RVS strip is a.o. that therewith one can avoid that during fixing of the steam pipe to the connection strip by welding the carbon contents within the weld seal becomes too high due to diffusion of carbon from the surrouding steel.
  • Convenient RVS types contain Fe, C and alloy components and also Ni and Cr.
  • A sufficient durability can be obtained if the connection strip has a width of about 30 mm at the most. If the width is too large, the connection strip will overheat and early collapse.
  • It is also learned that for a durable membrane wall the connection strip must suffice a predetermined straightness and the surface of the RVS welded onto the steam pipe must suffice a predetermined smoothness and layer thickness. The layer thickness is preferably between 1.8 and 2.5 mm.
  • Now an example is described in the drawings.
  • The drawing shows in fig. 1 a part of a membrane wall 1 in perspective. It is made of mutual parallel extending steam pipes 2 of carbon steel, all around coated by clad-welding of RVS. Slod RVS connection strips 3 are welded to the mutually spaced steam pipers 2. The weld connections are refered 4 (four in steam pipe longitudinal direction extending weld connections for each connecting strip 3 between two steam pipes).
  • Fig. 2 shows a steam pipe 2 in detail, showing the helical extending weld bead 5 of the clad-welded RVS coating. The pattern which is characteristic for the machine clad-welding of circumeferentially succeeding circle segment shaped lines 6 in the welding bead, coming from the advancing front of liquid welding material, is only partly shown. The clad-welded coating provides a continuous smooth layer.
  • Preferably the strip 3 is made of a composition according to Inconel 625 or 629 or others from the 600- or 700-series. This is also true for the coating or weld connection. Preferably the coating of weld connection or strip contains iron (Fe) less than 10 wt%, preferably less than about 7.5 wt%, more preferably less than about 5.5 wt%, such as less than about 7 wt% or about 5 wt%. The weld rod used for welding (coating, connection strip - pipe) contains preferably Fe less than 3 wt%, e.g. less than about 1.5 wt%, such as less than about 1

Claims (9)

  1. Steam pipe (2) of carbon steel for a membrane wall of an incinerator, provided with a stainless steel coating, e.g. Inconel 625, characterized in that said coating is made by helically clad-welding such that the coating onto the steam pipe (2) is a helically extending weld bead (5).
  2. Steam pipe according to claim 1, wherein the coat-welding of the RVS is carried out MIG welding and TIG disposed.
  3. Steam pipe according to any of claims 1 or 2, wherein the used weld rod contains less than 3 wt% Fe.
  4. Steam pipe according to any of claims 1-3, wherein the clad-welded coating provides a continuous smooth layer.
  5. Membrane wall (1) of an incinerator, comprising steam pipes (2) according to any of claims 1-5.
  6. Membrane wall according to claim 15, wherein the co-extending steam pipes are mutually welded together by a connection strip (3) of 100% stainless steel, preferably 30 mm wide at the most, fitted there between.
  7. Membrane wall according to claims 5 or 6, wherein for the coating and the connection strip the same RVS composition is used of preferably high corrosion and abrasive strength in relation with the environment within the incinerator.
  8. Membrane wall according to any of claims 5-7, wherein RVS material is used to weld the connection strip to the steam pipe, preferably having a composition substantially equal to that of the RVS used in the clad-welded coating of connection strip.
  9. Membrane wall according to any of claims 5-8, wherein the coating or strip of weld connection contains less than 10 wt% Fe (iron).
EP04076914A 2003-07-04 2004-07-04 Membrane wall Revoked EP1493968B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1023823 2003-07-04
NL1023823 2003-07-04

Publications (3)

Publication Number Publication Date
EP1493968A2 EP1493968A2 (en) 2005-01-05
EP1493968A3 EP1493968A3 (en) 2005-06-08
EP1493968B1 true EP1493968B1 (en) 2008-03-12

Family

ID=33432539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04076914A Revoked EP1493968B1 (en) 2003-07-04 2004-07-04 Membrane wall

Country Status (3)

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EP (1) EP1493968B1 (en)
AT (1) ATE389150T1 (en)
DE (1) DE602004012349T2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1785668A1 (en) 2005-08-23 2007-05-16 VISSER &amp; SMIT HANAB B.V. Welding frame for a membrane wall
DE102008047784A1 (en) 2008-07-02 2010-01-07 Hitachi Power Europe Gmbh Membrane wall of a large steam generator
CN101913060A (en) * 2010-08-04 2010-12-15 江苏申港锅炉有限公司 Method for machining membrane type water-cooled walls in boilers
NL2021445B1 (en) 2018-08-09 2020-02-20 Awect Bv High pressure heating installation comprising an advanced panel design and cladding thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB557853A (en) * 1941-08-06 1943-12-08 Babcock & Wilcox Ltd Improvements in or relating to furnace wall tubes
US2588421A (en) * 1947-12-19 1952-03-11 Metallizing Engineering Co Inc Application of sprayed metal coatings to solid objects
US3139866A (en) * 1958-05-03 1964-07-07 Babcock & Wilcox Ltd Studded tube construction with studs of alcr
US3404663A (en) * 1965-12-29 1968-10-08 Combustion Eng Prevention of furnace corrosion
US3304920A (en) * 1965-12-29 1967-02-21 Combustion Eng Chemical recovery unit
US4793269A (en) * 1988-02-29 1988-12-27 Westinghouse Electric Corp. Kiln for waste disposal
FI89519C (en) * 1992-02-19 1997-08-19 Ahlstrom Machinery Oy Procedure and apparatus for increasing the safety of a waste recovery plant
FI102396B (en) * 1995-03-22 1998-11-30 Kvaerner Power Oy Method and arrangement in a recovery boiler cooling medium circuit

Also Published As

Publication number Publication date
EP1493968A3 (en) 2005-06-08
DE602004012349T2 (en) 2009-05-14
DE602004012349D1 (en) 2008-04-24
EP1493968A2 (en) 2005-01-05
ATE389150T1 (en) 2008-03-15

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