EP0331929B1 - Procédé pour la production d'une atmosphère protectrice pour le traitement thermique de métaux ferreux et non ferreux - Google Patents

Procédé pour la production d'une atmosphère protectrice pour le traitement thermique de métaux ferreux et non ferreux Download PDF

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Publication number
EP0331929B1
EP0331929B1 EP89102430A EP89102430A EP0331929B1 EP 0331929 B1 EP0331929 B1 EP 0331929B1 EP 89102430 A EP89102430 A EP 89102430A EP 89102430 A EP89102430 A EP 89102430A EP 0331929 B1 EP0331929 B1 EP 0331929B1
Authority
EP
European Patent Office
Prior art keywords
combustion
gas
protective gas
methanol
producing
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 - Lifetime
Application number
EP89102430A
Other languages
German (de)
English (en)
Other versions
EP0331929A1 (fr
Inventor
Gottfried Dipl.-Ing. Böhm
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim 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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to AT89102430T priority Critical patent/ATE78877T1/de
Publication of EP0331929A1 publication Critical patent/EP0331929A1/fr
Application granted granted Critical
Publication of EP0331929B1 publication Critical patent/EP0331929B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere

Definitions

  • the invention relates to a method for producing a protective gas for the heat treatment of iron and non-ferrous metals.
  • Protective gas for the heat treatment of metals is conventionally produced in generators by burning combustion gases containing hydrocarbons. This type of production is very complex. A cheaper alternative is the reaction in jacket pipes, which is carried out with the help of catalysts.
  • Mantle jet tubes are used in industrial furnace construction to heat heat treatment systems with artificial atmospheres. They can be heated with gas or electrically.
  • a jacket jet pipe consists essentially of three pipes, namely the outer jacket pipe for heating the furnace chamber, the inner or combustion pipe in which the combustion takes place and the gas supply pipe to the combustion chamber in the combustion pipe.
  • a substoichiometric combustion in the jacket jet pipe would result in reducing components in the exhaust gas (protective gas), but would lead to sooting and to the pipes burning.
  • Another way of generating protective gas is to spray nitrogen-methanol mixtures into the annealing furnace. At temperatures above 750 ° C, the methanol decomposes according to the equation CH3DH ⁇ 2H2 + CO.
  • a carburizing agent such as propane or natural gas can also be added to this cracked gas.
  • This type of protective gas production is very inexpensive, but it requires an externally heated annealing furnace with operating temperatures above 750 ° C.
  • From DE-A-3 422 608 it is also known to produce a protective gas from nitrogen and methanol with the aid of a jacket jet pipe, by decomposing the methanol in a space heated by the jet pipe and shielded from the furnace atmosphere and together with the nitrogen is passed into the furnace interior.
  • the jet pipe is heated electrically or by burning a fuel.
  • the invention has for its object to provide a method which enables the production of inert gas by combustion of a hydrocarbon-containing fuel gas in a jacket jet tube even in those cases in which no external heat is supplied.
  • the invention is based on the knowledge that it is possible to feed a nitrogen-methanol mixture in sufficient quantity into the combustion chamber of a jacket jet tube operated with a stoichiometric ratio of ⁇ equal to or close to 1, on the one hand to obtain a desired protective gas atmosphere without on the other hand Oven temperature of 750 ° C is required.
  • the jacket jet In the case of stoichiometric combustion, on the other hand, the jacket jet always has temperatures above 750 ° C.
  • the advantages of the method according to the invention lie above all in the annealing of non-ferrous metal, because it offers an inexpensive alternative to protective gas generated by the generator and to hydrogen-nitrogen mixtures.
  • the method according to the invention is also suitable for bright annealing steel, but drying must be carried out afterwards.
  • a jacket jet is shown in a very simplified form, in which natural gas is burned with air to generate protective gas.
  • the natural gas is supplied through a gas supply pipe 1, which is surrounded concentrically by the combustion pipe 2.
  • the combustion air flows through the combustion tube 2 and forms the flame 4 with the natural gas in the combustion chamber 3.
  • the fuel tube 2 is surrounded concentrically on all sides by the jacket tube 5, but leaves the outlet from the fuel tube 2 free.
  • the flue gases therefore flow back outside the combustion tube 2 and leave the jacket jet pipe through the nozzle 6 as a protective gas, which reaches the furnace directly at high temperature.
  • a nitrogen-methanol mixture is sprayed into the combustion chamber 3.
  • the amount of nitrogen-methanol is measured so that the combustion temperature in combustion chamber 3 does not drop below 750 ° C.
  • the methanol could also be pumped into the jacket tube in pure form and sprayed into the combustion chamber 3.
  • the combustion temperature in combustion chamber 3 is approximately 850 ° C.
  • this shielding gas for example, copper can be bright annealed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Coating By Spraying Or Casting (AREA)

Claims (3)

1. Procédé de d'obtention d'un gaz protecteur pour le traitement thermique de métaux ferreux et non ferreux selon lequel on brûle un gaz combustible contenant des hydrocarbures dans un tube-enveloppe de rayonnement, avec de l'air, on fait réagir du méthanol évaporé, sans catalyseur et les fumées ainsi obtenues sont utilisées pour former le gaz protecteur, un mélange d'azote et de méthanol étant injecté dans la chambre de combustion du tube-enveloppe de rayonnement.
2. Procédé selon la revendication 1,
caractérisé en ce
qu'on ne dépasse pas une température de combustion de 750°C dans le tube-enveloppe de rayonnement.
3. Procédé selon la revendication 1 ou 2,
caractérisé en ce que
la combustion du gaz combustible contenant des hydrocarbures se fait à rapport stoechiométrique 1 = 1.
EP89102430A 1988-03-11 1989-02-13 Procédé pour la production d'une atmosphère protectrice pour le traitement thermique de métaux ferreux et non ferreux Expired - Lifetime EP0331929B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89102430T ATE78877T1 (de) 1988-03-11 1989-02-13 Verfahren zur herstellung eines schutzgases fuer die waermebehandlung von eisen und nichteisenmetallen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3808146A DE3808146A1 (de) 1988-03-11 1988-03-11 Verfahren zur herstellung eines schutzgases fuer die waermebehandlung von eisen und nichteisenmetallen
DE3808146 1988-03-11

Publications (2)

Publication Number Publication Date
EP0331929A1 EP0331929A1 (fr) 1989-09-13
EP0331929B1 true EP0331929B1 (fr) 1992-07-29

Family

ID=6349493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89102430A Expired - Lifetime EP0331929B1 (fr) 1988-03-11 1989-02-13 Procédé pour la production d'une atmosphère protectrice pour le traitement thermique de métaux ferreux et non ferreux

Country Status (3)

Country Link
EP (1) EP0331929B1 (fr)
AT (1) ATE78877T1 (fr)
DE (1) DE3808146A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4308803A1 (de) * 1993-03-19 1994-09-22 Leybold Durferrit Gmbh Verfahren und Vorrichtung zum Herstellen einer kohlenstoffhaltigen gasförmigen Behandlungsatmosphäre
DE19536706A1 (de) * 1995-10-02 1997-04-03 Lbe Beheizungseinrichtungen Mantelstrahlheizrohr
TW201418476A (zh) * 2012-11-01 2014-05-16 Metal Ind Res & Dev Ct 用於小型熱處理爐之爐氣產生裝置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1106787B (de) * 1956-04-26 1961-05-18 Renault Vorrichtung zum Speisen einer Gruppe von Waermebehandlungsoefen fuer Metalle mit Schutzgas aus Daempfen organischer Fluessigkeiten, die mit Stickstoff angereichert sind
US4139375A (en) * 1978-02-06 1979-02-13 Union Carbide Corporation Process for sintering powder metal parts
DE3037643A1 (de) * 1980-10-04 1982-05-13 Linde Ag, 6200 Wiesbaden Verfahren und vorrichtung zum entkohlenden oder kohlungsneutralen gluehen von metallteilen
DE3104280C2 (de) * 1981-02-07 1982-10-21 Daimler-Benz Ag, 7000 Stuttgart Verfahren zur Erzeugung von Schutzgas aus dem Abgas von strahlrohrbeheizten Öfen
GB2145503B (en) * 1983-08-24 1987-03-11 Golding Ivor Lawrence Sydney Process of producing protective atmosphere in heat treatment furnaces and ovens
DE3422608A1 (de) * 1984-06-18 1985-12-19 Linde Ag, 6200 Wiesbaden Verfahren und vorrichtung zum herstellen einer kohlenmonoxid und wasserstoff enthaltenden gasatmosphaere

Also Published As

Publication number Publication date
ATE78877T1 (de) 1992-08-15
EP0331929A1 (fr) 1989-09-13
DE3808146A1 (de) 1989-09-21

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