US20140113240A1 - Multi-flame burner and method for heating a workpiece - Google Patents

Multi-flame burner and method for heating a workpiece Download PDF

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Publication number
US20140113240A1
US20140113240A1 US14/059,738 US201314059738A US2014113240A1 US 20140113240 A1 US20140113240 A1 US 20140113240A1 US 201314059738 A US201314059738 A US 201314059738A US 2014113240 A1 US2014113240 A1 US 2014113240A1
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US
United States
Prior art keywords
burner
flame
heads
feed line
burner heads
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.)
Abandoned
Application number
US14/059,738
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English (en)
Inventor
Johann Stocker
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.)
Linde GmbH
Original Assignee
Linde GmbH
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 Linde GmbH filed Critical Linde GmbH
Assigned to LINDE AKTIENGESELLSCHAFT reassignment LINDE AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STOCKER, JOHANN
Publication of US20140113240A1 publication Critical patent/US20140113240A1/en
Priority to US15/405,863 priority Critical patent/US10041671B2/en
Abandoned legal-status Critical Current

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Classifications

    • F23D21/005—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D23/00—Assemblies of two or more burners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/235—Preliminary treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/38—Torches, e.g. for brazing or heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D91/00—Burners specially adapted for specific applications, not otherwise provided for
    • F23D91/02—Burners specially adapted for specific applications, not otherwise provided for for use in particular heating operations

Definitions

  • the invention relates to a multi-flame burner with burner heads and a method for preheating a workpiece, in particular a pipe or large-diameter pipe, with a corresponding multi-flame burner.
  • the achievable hardness, and hence the danger of cold cracks here essentially depends on the thickness of the workpiece to be machined, two- or three-dimensional heat dissipation, present alloy elements and their contents, the respective heat introduced in the welding operation and/or the component temperature.
  • the latter can be influenced by preheating. Preheating reduces the cooling rate of the seam region, and improves hydrogen effusion. In addition, it has a favorable effect on the residual welding stress state of the welded joint.
  • the necessary preheating temperature can be respectively ascertained, and the heat to be introduced and/or the use of respective preheating device can be determined based hereupon.
  • the basic tenacity of the material, its wall thickness, the seam shape, the used welding technique and welding speed are to be considered when determining the preheating temperature.
  • Preheating is basically required at processing temperatures of under 5° C. and when specific thickness limits are exceeded (especially for high-strength steels).
  • the preheating temperature measures 80° to 200° C.
  • workpieces are preheated prior to welding preferably using multi-flame burners, which for reasons explained in greater detail below are operated with acetylene and oxygen-containing fuel mixtures or acetylene and compressed air-containing fuel mixtures, for example.
  • Preheating takes place to prepare a region proximate to the welded seam on the workpiece (e.g., pipe or large-diameter pipe) for introducing a welded seam in this preheated region, which is hence already warm at the start of the welding process (warm here means at least warmer than the ambient air).
  • pipes with a diameter ranging from 1 meter to 12 meters are designated as large-diameter pipes.
  • the invention proposes a multi-flame burner with burner heads and accompanying connection pipes, which are set up to generate at least one burner flame directed along a respective flame axis when supplied with a fuel, as well as a method for preheating a workpiece, in particular a pipe or large-diameter pipe, with the use of a corresponding multi-flame burner having the features in the independent claims.
  • the set object is achieved by offsetting at least half of the connection pipe, so that the flame axes of respectively adjacent burner heads are inclined relative to each other.
  • the present invention draws reference first and foremost to preheating in welding operations.
  • the invention can basically also be used in other methods in which introducing heat by means of flames is desired.
  • the multi-flame burner is preferably configured in such a way that all connection pipes are offset in design.
  • the multi-flame burner be configured in such a way that the offset connection pipes exhibit an offset angle of 30° to 60°, preferably of approximately 45°.
  • connection pipes be pivoted with a respective connection nozzle by way of a screw joint, wherein the respective other end of the connection nozzles is secured to a shared feed line, and can be supplied with the fuel through the shared feed line.
  • the burner heads are provided in at least two groups (A and B) of burner heads, wherein the burner heads of at least one first group (A) are each arranged alternately to the burner heads of at least one other group (B), and the flame axes of the burner heads of at least the first group A are inclined relative to the flame axes of the burner heads of at least the one other group B.
  • the burner heads within each group are best arranged in the same direction or parallel to each other.
  • the burner heads in at least two groups, wherein the burner heads of the at least two groups each are alternately arranged, and the flame axes of the burner heads in at least one or each group each deviate in relation to the flame axes of at least one or each other group.
  • the flame axes within each group can be arranged in parallel. This makes serial production especially easy.
  • the burner heads each exhibit flame axes, which are axially and/or radially inclined in relation to a perpendicular on a center line of the feed line, preferably respectively adjacent burner heads inclined by an angle of 5° to 45° relative to each other.
  • a corresponding multi-flame burner is preferably configured in such a way that the flame axes of the adjacent burner heads are each skewed in relation to each other. For example, they can be inclined axially or radially to the perpendicular on the center line by an angle of 5° to 45°.
  • the respectively selected angles also depend on the requirements of the respective heating process. A tighter angle is required in particular given the necessity of extensive local heating. Larger angles are possible if the goal is to discharge the generated exhaust gases in an especially effective manner.
  • the multi-flame burner best exhibits a gas supply device set up to supply the multi-flame burner with at least one gaseous fuel, wherein the gas supply device is preferably set up to supply the multi-flame burner with an acetylene-containing fuel mixture, especially preferably an acetylene-(compressed) air-mixture or an acetylene-oxygen mixture, as the at least one gaseous fuel.
  • the gas supply device is preferably set up to supply the multi-flame burner with an acetylene-containing fuel mixture, especially preferably an acetylene-(compressed) air-mixture or an acetylene-oxygen mixture, as the at least one gaseous fuel.
  • At least one gas supply device set up to supply the multi-flame burner with at least one gaseous fuel.
  • the latter is preferably controllable in design, so that the respectively introduced thermal output can be controlled and/or the provision of respectively adjusted gas mixtures ensures an especially advantageous adaptation to the material to be welded.
  • a multi-flame burner according to the invention exhibits at least 4, 6 or 8 burner heads.
  • the burner heads are preferably spaced apart 5 cm to 15 cm from each other. Corresponding distances depend on the homogeneity of the heating to be achieved and/or the permissible temperature of he burner heads.
  • the burner heads exhibit burner nozzles, wherein the burner nozzles of the respectively adjacent burner heads are offset by 1 cm to 10 cm relative to a shared center line between the burner nozzles.
  • the origins of the respective flames are here spaced a defined distance apart from each other, thereby further reducing the influence of the burner heads on each other.
  • the multi-flame burner exhibit a feed line configured as a bent shaft, wherein the bent shaft is preferably made essentially out of stainless steel.
  • the feed line which can also be referred to as a shaft or expressed differently once again as a pipeline, is best made out a metallic material for supplying the fuel.
  • a bent configuration makes it adjustable to the shape of the workpiece to be preheated, e.g., to the curvature of a large-diameter pipe to be preheated, which is very advantageous in terms of the present invention. From a production standpoint, stainless steel is especially suitable as the metallic material for such a bent configuration.
  • the burner heads with the flame axes inclined in relation to each other are advantageously each alternately secured to a shared feed line and can be supplied by way of the latter in a corresponding multi-flame burner.
  • the feed line here simultaneously functions as a fuel distributor and fastening device for the burner heads.
  • a corresponding feed line can be bent, and thereby adjusted to the shape of a workpiece to be heated.
  • the feed line is advantageously deformed in such a way as to essentially reproduce the corresponding shape of the workpiece.
  • a circular segment have the same midpoint as a (large-diameter) pipe to be preheated and a bend adjusted based on the larger radius (pipe radius plus radial distance between the pipe and feed line).
  • other shapes may also be advantageous and in keeping with the invention.
  • the adjustability of the multi-flame burner to the shape of the workpiece to be preheated, in particular to the diameter of the pipe to be preheated, is an essential advantage to the present invention in relation to prior art.
  • the set object is achieved by a method for preheating a workpiece, in particular a pipe or large-diameter pipe, in which a multi-flame burner is used, and burner flames generated by the multi-flame burner are directed at the workpiece.
  • a method for preheating a workpiece in particular a pipe or large-diameter pipe, in which a multi-flame burner is used, and burner flames generated by the multi-flame burner are directed at the workpiece.
  • the burner heads are alternately interleaved relative to each other according to the invention, so that the respectively created flames point away from each other. As a result, the hot exhaust gases generated by the flames cannot damage each other.
  • Corresponding burner heads are usually attached to a shared feed line in the form of a pipeline.
  • the latter can be straight or bent as desired, and exhibits a central axis that is also straight or bent, depending on the configuration of the feed line.
  • the alignment of flame axes is here advantageously such that the latter are inclined axially (i.e., longitudinally relative to the feed line) and/or radially (i.e., transversely relative to the latter) in relation to a respective perpendicular on the central axis at the attachment site.
  • the inclination of adjacent burner heads is here preferably opposite in at least one of these directions. This can mean that the burner heads are radially alternately inclined clockwise and counterclockwise in relation to the axis of the feed line.
  • one essential aspect of the present invention involves an arrangement or alignment of the burner heads, and hence the flame and exhaust gas direction, that deviates from prior art.
  • the exhaust gas is guided by inclining the burners in such a way that their primary flames hit a region near the welded seam in line with their function, but the exhaust stream does not heat the adjacent burner(s).
  • preferably defined angular positions of the burners relative to each other are possible and must be maintained for this purpose. The latter advantageously arise from offsetting the connection pipes, and potentially from how the connection pipes are aligned at the rotatable screw joint.
  • the invention makes it possible to introduce a maximum thermal output onto a small space, in particular onto a large-diameter pipe that itself rotates.
  • a more concentrated introduction of heat by comparison to devices in prior art, the danger of burners heating is minimized, even given an incorrect operation. This results in lower downtimes and less need for repairs, which makes corresponding methods economically advantageous.
  • the measures proposed by the invention yield a significantly reduced burner weight in relation to the thermal output to be introduced.
  • a corresponding multi-flame burner can advantageously be supplied with an acetylene mixture, in particular an acetylene/oxygen mixture, making it possible to also use the advantages for known acetylene processes with the burner according to the invention.
  • the especially hot, concentrated acetylene/oxygen flame yields a rapid temperature rise on the workpiece surface, and causes heat to accumulate inside the workpiece at high temperature gradients, so that a large amount of heat can be locally introduced.
  • acetylene/compressed air flames and/or acetylene/suction air burners can also be used, for example. Acetylene/compressed air flames are soft and gentle, yet intensive and efficient.
  • the described multi-flame burners as a whole advantageously exhibit 4, 6 or 8 burner heads.
  • this yields advantages by comparison to previously known three-headed preheating burners, since a larger area of a workpiece can be heated at any one time.
  • the arrangement according to the invention makes it possible to attach eight or more burner heads to a distribution pipe, specifically the already mentioned feed line, without the latter overheating themselves or each other impermissibly.
  • a larger thermal output can as a result be introduced over a small space, in particular over a rotating large-diameter pipe.
  • the number of usable burner heads is not confined to four or eight; rather, burners with 10, 12, 14, 16, 18 or 20 burners or a higher number of burners can also be manufactured.
  • FIG. 1 shows a burner head, which can be used for a multi-flame burner according to an embodiment of the invention.
  • FIG. 2 shows a schematic, side view of a multi-flame burner according to an embodiment of the invention.
  • FIG. 3 shows a schematic, longitudinal view of a multi-flame burner according to an embodiment of the invention.
  • FIG. 1 shows a schematic view of a burner head 1 exhibiting a nozzle ring 12 that can have any desired number of preferably concentrically arranged nozzles, through which fuel can escape. Igniting the fuel produces a burner flame 13 , which runs along a flame axis 14 .
  • the burner head 1 can be attached to a feed line by way of an offset connection pipe 4 along with a screw joint 15 and connection nozzle 16 .
  • the connection nozzle 16 is welded to the feed line.
  • FIG. 2 shows a schematic, side view of a multi-flame burner according to an especially preferred embodiment of the invention, which is marked 10 overall.
  • the multi-flame burner 10 encompasses a total of eight burner heads 1 , each with respectively accompanying, offset connection pipes 4 , not all of which are provided with reference numbers.
  • the burner heads 1 are here combined into groups of burner heads A and B.
  • a first group of burner heads A is here arranged in such a way that the respective nozzle units or the nozzles provided there can yield burner flames with flame axes essentially arranged in the same direction. The same holds true for the burner heads in group B.
  • the flame axes 14 in group A and the flame axes 14 in group B are inclined or skewed relative to each other given the inclined position of the burner heads 1 , so that respectively produced exhaust gases and/or the generated waste heat will not damage adjacent burner heads 1 .
  • the screw joints 15 described above and the connection nozzles 16 are used to secure the burner heads 1 to a feed line 2 , for example one that is bent, and hence can be adjusted to the shape of a workpiece to be machined.
  • the feed line can be coupled with a supply line 3 , which can exhibit other devices, such as a manometer and regulator.
  • a supply line can exhibit a mixing unit 31 , with which an acetylene/oxygen mixture and/or an acetylene/air mixture can be generated.
  • connection nozzle 16 can be lengthened and offset in design, thereby combining the connection nozzle 16 and connection pipe 4 into a single component.
  • FIG. 3 shows a longitudinal view of a multi-flame burner according to an especially preferred embodiment of the invention, which is also marked 10 .
  • the respective burner heads 1 are slanted relative to each other, so that the arising flames 13 point away from each other.
  • the feed line 2 can be bent or straight in design.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Gas Burners (AREA)
US14/059,738 2012-10-23 2013-10-22 Multi-flame burner and method for heating a workpiece Abandoned US20140113240A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/405,863 US10041671B2 (en) 2012-10-23 2017-01-13 Multi-flame burner and method for heating a workpiece

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012020801.4A DE102012020801A1 (de) 2012-10-23 2012-10-23 Mehrflammenbrenner und Verfahren zum Erwärmen eines Werkstücks
DE102012020801.4 2012-10-23

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/405,863 Continuation-In-Part US10041671B2 (en) 2012-10-23 2017-01-13 Multi-flame burner and method for heating a workpiece

Publications (1)

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US20140113240A1 true US20140113240A1 (en) 2014-04-24

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US14/059,738 Abandoned US20140113240A1 (en) 2012-10-23 2013-10-22 Multi-flame burner and method for heating a workpiece

Country Status (9)

Country Link
US (1) US20140113240A1 (ru)
EP (1) EP2724806B1 (ru)
CN (1) CN103776031A (ru)
BR (1) BR102013027195B1 (ru)
CA (1) CA2830580C (ru)
DE (1) DE102012020801A1 (ru)
DK (1) DK2724806T3 (ru)
RU (1) RU2635949C2 (ru)
ZA (1) ZA201307888B (ru)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150128926A1 (en) * 2013-11-14 2015-05-14 Lennox Industries Inc. Multi-burner head assembly
CN112091372A (zh) * 2020-04-30 2020-12-18 中国航发航空科技股份有限公司 一种用于环形机匣氩弧焊的辅助加热装置及加热方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104633662B (zh) * 2015-02-06 2017-10-10 茂名重力石化装备股份公司 一种焊接加热器
CN105240851A (zh) * 2015-11-02 2016-01-13 无锡华光锅炉股份有限公司 一种火焰加热装置
EP3712499A1 (de) 2019-03-19 2020-09-23 Linde GmbH Brenneranordnung

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US3254696A (en) * 1963-10-22 1966-06-07 Crucible Steel Co America Scarfing burner tip
US3806038A (en) * 1972-06-30 1974-04-23 Bernzomatic Corp Burner for low pressure lpg torch
US4434747A (en) * 1982-07-01 1984-03-06 Combustion Engineering, Inc. Burner-tilt drive apparatus for a pulverized coal fired steam generator
US4834645A (en) * 1988-03-07 1989-05-30 Iowa State University Research Foundation, Inc. Method and apparatus for transport, introduction, atomization and excitation of emission spectrum for quantitative analysis of high temperature gas sample streams containing vapor and particulates without degradation of sample stream temperature
US20100206965A1 (en) * 2009-02-13 2010-08-19 Gibowski Steven R Adjustable, multiple splash plate liquor guns
US20100209862A1 (en) * 2009-02-17 2010-08-19 Hahn Nicholas R Burner nozzle assembly for use in association with animal carcass dehairing equipment
US20100248169A1 (en) * 2009-03-31 2010-09-30 Morgan Edward R Adjustable Burners for Heaters
US20140065564A1 (en) * 2012-08-30 2014-03-06 Honda Motor Co., Ltd. Preheat burner assembly and method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2137185A (en) * 1938-02-28 1938-11-15 E J Lavino & Co Multiple burner arrangement
US3254696A (en) * 1963-10-22 1966-06-07 Crucible Steel Co America Scarfing burner tip
US3806038A (en) * 1972-06-30 1974-04-23 Bernzomatic Corp Burner for low pressure lpg torch
US4434747A (en) * 1982-07-01 1984-03-06 Combustion Engineering, Inc. Burner-tilt drive apparatus for a pulverized coal fired steam generator
US4834645A (en) * 1988-03-07 1989-05-30 Iowa State University Research Foundation, Inc. Method and apparatus for transport, introduction, atomization and excitation of emission spectrum for quantitative analysis of high temperature gas sample streams containing vapor and particulates without degradation of sample stream temperature
US20100206965A1 (en) * 2009-02-13 2010-08-19 Gibowski Steven R Adjustable, multiple splash plate liquor guns
US20100209862A1 (en) * 2009-02-17 2010-08-19 Hahn Nicholas R Burner nozzle assembly for use in association with animal carcass dehairing equipment
US20100248169A1 (en) * 2009-03-31 2010-09-30 Morgan Edward R Adjustable Burners for Heaters
US20140065564A1 (en) * 2012-08-30 2014-03-06 Honda Motor Co., Ltd. Preheat burner assembly and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150128926A1 (en) * 2013-11-14 2015-05-14 Lennox Industries Inc. Multi-burner head assembly
US10480823B2 (en) * 2013-11-14 2019-11-19 Lennox Industries Inc. Multi-burner head assembly
CN112091372A (zh) * 2020-04-30 2020-12-18 中国航发航空科技股份有限公司 一种用于环形机匣氩弧焊的辅助加热装置及加热方法

Also Published As

Publication number Publication date
EP2724806B1 (de) 2020-07-15
DE102012020801A1 (de) 2014-04-24
CA2830580C (en) 2020-09-22
RU2635949C2 (ru) 2017-11-17
RU2013147341A (ru) 2015-04-27
EP2724806A1 (de) 2014-04-30
BR102013027195B1 (pt) 2021-03-16
BR102013027195A2 (pt) 2015-07-28
DK2724806T3 (en) 2022-05-09
CN103776031A (zh) 2014-05-07
ZA201307888B (en) 2016-01-27
CA2830580A1 (en) 2014-04-23

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Owner name: LINDE AKTIENGESELLSCHAFT, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STOCKER, JOHANN;REEL/FRAME:031583/0983

Effective date: 20131031

STCB Information on status: application discontinuation

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