EP0141101B1 - Verfahren und Mehrflammbrenner zum Erwärmen von Metallwerkstücken - Google Patents

Verfahren und Mehrflammbrenner zum Erwärmen von Metallwerkstücken Download PDF

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Publication number
EP0141101B1
EP0141101B1 EP84109917A EP84109917A EP0141101B1 EP 0141101 B1 EP0141101 B1 EP 0141101B1 EP 84109917 A EP84109917 A EP 84109917A EP 84109917 A EP84109917 A EP 84109917A EP 0141101 B1 EP0141101 B1 EP 0141101B1
Authority
EP
European Patent Office
Prior art keywords
flame
gas
flame gas
supplied
mixing proportion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84109917A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0141101A2 (de
EP0141101A3 (en
Inventor
Helmut Dipl.-Ing. Meinass
Klaus Dipl.-Ing. Schumacher
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
Priority to AT84109917T priority Critical patent/ATE30632T1/de
Publication of EP0141101A2 publication Critical patent/EP0141101A2/de
Publication of EP0141101A3 publication Critical patent/EP0141101A3/de
Application granted granted Critical
Publication of EP0141101B1 publication Critical patent/EP0141101B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • 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
    • F23D14/32—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid using a mixture of gaseous fuel and pure oxygen or oxygen-enriched air
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/56—Nozzles for spreading the flame over an area, e.g. for desurfacing of solid material, for surface hardening, or for heating workpieces
    • 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 method for heating or partial heating of metal workpieces by multi-flame burners fed with fuel gas-oxygen mixtures and a multi-flame burner for carrying out the method.
  • the heating process for which mostly so-called premix burners are used, is controlled depending on the workpiece temperature or the heating time in order to achieve a short warm-up time on the one hand and to avoid overheating of the workpiece surface on the other hand (e.g. processes in oxyacetylene technology, German publisher for welding technology GmbH, Düsseldorf, 1973, chapter 15 - flame heating).
  • the heat transfer to the metal workpiece can be influenced by varying various parameters: e.g. by changing the gas flow rates, the torch distance from the workpiece, the mixture composition or by switching individual torches on or off.
  • the premix burners have the disadvantage that they tend to reignite if the mixture ratio provides the maximum ignition speed and if the gas throughputs are reduced too much. Backfire can easily destroy a burner.
  • the burner spacing as a variable size does not result in gas savings. Since the gas price of acetylene is about 10 times higher than that of oxygen, oxygen-rich flames are more economical. However, these cause scaling on the surface.
  • the object of the present invention is therefore to economically optimize heating processes using multi-flame burners, i.e. to shorten the warming-up time, save on gas costs and avoid scaling on the workpiece surface.
  • This object is achieved in that two types of flame gases A, B are used, and that the flame gas A is used in a mixture ratio less than the mixture ratio for the maximum ignition speed and the flame gas B in a mixture ratio greater than the mixture ratio for the maximum ignition speed will.
  • the flame gases A and B are subjected to an external mixture. This procedure guarantees that the burner will re-ignite, since no single flame is fed with the mixing ratio of the maximum ignition speed, but this ratio, which is favorable for heat transfer, is achieved by external mixing.
  • the flame gases A and B are used during a heating process with different burning times.
  • the supply of flame gas B is switched off after a predetermined temperature value has been reached.
  • a first warming-up phase maximum heat output and thus rapid heating with high use of oxygen is achieved.
  • temperatures which are not yet very high, there is no scaling, or at least not so much.
  • a second warm-up phase only flame gas A is used, and scaling is avoided by the appropriately set mixing ratio. At the same time, the workpiece is warmed up and the temperature rises slowly with reduced heat output. Overall, this way of working results in a gas saving.
  • the method according to the invention can be carried out with all types of fuel gases, e.g. B. acetylene, propane, butane, natural gas. However, it is given as an example for acetylene. The results are similar for other fuel gases or fuel gas mixtures.
  • acetylene as the fuel gas, it has proven to be suitable if the flame gas A and the flame gas in a mixing ratio between 1.1 and 1.6 O Z / C Z H 2 , preferably 1.3 0 2 / C 2 H 2 B in a mixing ratio between 1.6 and 2.5 0 2 / C 2 H 2 , preferably 2.0 0 2 / C 2 H 2 .
  • the mixing ratio of the maximum ignition speed which is favorable for heat transfer, can be achieved by the external mixture. B. depends on the material or the pressure.
  • the invention also relates to a multi-flame burner, which is characterized in that outlet channels for the flame gases A, B are arranged in at least three parallel rows and that the flame gas A exits in the outer rows and the flame gas B in the inner row of the channels.
  • the multi-flame burner can be connected to a control device for setting the required mixing ratios, supply lines for the flame gas A or for the flame gas B being connected to the control device.
  • control variables for the desired Mixing ratios the temperature and the time are expediently used.
  • FIG. 1 shows the end face of a multi-flame burner 1, in which outlet channels 2 for a flame gas A or outlet channels 3 for a flame gas B are arranged in three parallel rows.
  • FIG. 2 the supply of the multi-flame burner 1 with the fuel gas-oxygen mixture is shown.
  • a control device 4 is supplied with oxygen and, for example, acetylene as fuel gas and mixed as a function of the control variables temperature / time.
  • This creates a flame gas A, z. B. has a mixing ratio of 1.3 0 2 / C 2 H 2 and is fed via a supply line 5 into the burner in order to exit there via the channels 2.
  • a flame gas B with a mixing ratio of 2.0 0 2 / C 2 H 2 is produced , which is fed into the burner via a supply line 6 and exits via the central channels 3.
  • the flames A and B shown are adjusted by external mixing such that they heat the workpiece in the most favorable ratio for heat transfer to a metal workpiece 7.
  • the heating process is divided into two phases according to the diagram shown in FIG. 3 (abscissa: time, ordinate: temperature).
  • a first phase the multi-flame burner is fed with flame gas A and flame gas B.
  • flame gas A and flame gas B In this way, maximum heat output and thus rapid heating is achieved.
  • the high use of oxygen is cheap because oxygen is cheaper than acetylene.
  • phase 1 of the heating process is shorter than phase 2, but depending on the application, both phases can also be of the same length.
  • Flame gas B is switched off after a certain temperature has been reached.
  • FIG 4 shows an embodiment in which two multi-flame burners 8, 9 are connected in parallel.
  • Oxygen is supplied via a line 10, acetylene via a line 11 and cooling water via a line 12.
  • the voltage is supplied via an electrical line 17.
  • Pressure switches 13, 14, 15, 16 are arranged in the lines 10, 11, 12.
  • the pressure switch 13 for oxygen responds to a minimum of 2.5 bar
  • the pressure switch 14 for acetylene to a minimum of 0.5 bar
  • the pressure switch 16 for cooling water to a maximum of 0.5 bar.
  • Pressure regulators 19, 20 for oxygen are also arranged in line 10 and in a branch line 18, both of which respond to a maximum of 5.0 bar.
  • the mixing ratio for the flame gases A and B can be set by means of a timer 25 by means of corresponding signals on the solenoid valves.
  • Acetylene from a branch line 26 is mixed with oxygen in line 18 to produce the flame gas A, acetylene from branch line 27 with oxygen from line 10 for generating a flame gas B for the multi-flame burner 8, and correspondingly acetylene from branch line 28 with oxygen from branch line 29 for generation of flame gas A and acetylene from branch line 30 mixed with oxygen from branch line 31 to generate flame gas B for multi-flame burner 9.
  • the flame characteristics A and B are indicated symbolically.
  • a pilot flame 32 is also fed via line 11.
  • the ignition is monitored via 33.
  • the flame gas B of the multi-flame burner 8 or 9 is switched off via the time switch 25, so that the further temperature increase takes place slowly with flame gas A.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Baking, Grill, Roasting (AREA)
  • Forging (AREA)
EP84109917A 1983-08-25 1984-08-21 Verfahren und Mehrflammbrenner zum Erwärmen von Metallwerkstücken Expired EP0141101B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84109917T ATE30632T1 (de) 1983-08-25 1984-08-21 Verfahren und mehrflammbrenner zum erwaermen von metallwerkstuecken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3330685 1983-08-25
DE3330685A DE3330685A1 (de) 1983-08-25 1983-08-25 Verfahren und mehrflammenbrenner zum erwaermen von metallwerkstuecken

Publications (3)

Publication Number Publication Date
EP0141101A2 EP0141101A2 (de) 1985-05-15
EP0141101A3 EP0141101A3 (en) 1986-03-26
EP0141101B1 true EP0141101B1 (de) 1987-11-04

Family

ID=6207426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84109917A Expired EP0141101B1 (de) 1983-08-25 1984-08-21 Verfahren und Mehrflammbrenner zum Erwärmen von Metallwerkstücken

Country Status (5)

Country Link
EP (1) EP0141101B1 (es)
AT (1) ATE30632T1 (es)
DE (2) DE3330685A1 (es)
DK (1) DK406584A (es)
ES (1) ES535346A0 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2667928B1 (fr) * 1990-10-16 1995-07-28 Air Liquide Procede de chauffe d'une enceinte thermique.
DE19750704C2 (de) * 1997-11-15 2001-12-06 Ulrich Tischler Anwärmbrenner mit Atmosphärenschutz
DE102004035276A1 (de) * 2004-07-21 2006-02-16 WS - Wärmeprozesstechnik GmbH Brennerdüsenfeld mit integrierten Wärmetauschern
DE102008058420A1 (de) * 2008-11-21 2010-05-27 Air Liquide Deutschland Gmbh Verfahren und Vorrichtung zum Anwärmen eines Bauteils mit einem atmosphärischen Anwärmbrenner
US8381563B2 (en) 2009-06-08 2013-02-26 Ati Properties, Inc. Forging die heating apparatuses and methods for use

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532567A (en) * 1945-08-07 1950-12-05 Nat Cylinder Gas Co Descaling burner
DE2049900A1 (de) * 1970-10-10 1972-04-13 Borchert, Alex, 4800 Bielefeld Gasbrenner

Also Published As

Publication number Publication date
DE3467238D1 (en) 1987-12-10
DK406584D0 (da) 1984-08-24
ATE30632T1 (de) 1987-11-15
ES8505472A1 (es) 1985-05-16
DK406584A (da) 1985-02-26
DE3330685A1 (de) 1985-03-14
EP0141101A2 (de) 1985-05-15
EP0141101A3 (en) 1986-03-26
ES535346A0 (es) 1985-05-16

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