EP0364709B1 - Procédé pour produire une atmosphère pour le traitement gazeux dans un appareil pour le traitement thermique - Google Patents

Procédé pour produire une atmosphère pour le traitement gazeux dans un appareil pour le traitement thermique Download PDF

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Publication number
EP0364709B1
EP0364709B1 EP89116228A EP89116228A EP0364709B1 EP 0364709 B1 EP0364709 B1 EP 0364709B1 EP 89116228 A EP89116228 A EP 89116228A EP 89116228 A EP89116228 A EP 89116228A EP 0364709 B1 EP0364709 B1 EP 0364709B1
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Prior art keywords
gas
air
atmosphere
alcohol
treatment device
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EP89116228A
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German (de)
English (en)
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EP0364709A1 (fr
Inventor
Reinhard Dipl.-Ing. Strigl
Andreas Dipl.-Ing. Dey
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Linde GmbH
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Linde GmbH
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    • 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 treatment gas atmosphere in a heat treatment device by thermal decomposition of starting materials introduced into the treatment room of the heat treatment device.
  • Methods for producing treatment gas atmospheres in particular from the field of heat treatment of metallic workpieces, are known which, on the one hand, generate a suitable treatment gas from natural gas and air in gas generators located outside the heat treatment device or in catalyst steel pipes integrated within the heat treatment device.
  • processes are known in which a suitable treatment gas atmosphere is produced by introducing nitrogen and methanol into the treatment room of a heat treatment device (see prior art and processes of DE 30 19 830 B2).
  • the former methods have the disadvantage that they are relatively inflexible both with regard to the amount of treatment gas and with regard to the composition of the treatment gas.
  • the object of the present invention is therefore to provide an inexpensive method with high flexibility and simple design.
  • This object is achieved in that hydrocarbon gas, alcohol, air and nitrogen are introduced simultaneously and adjacent to one another into the treatment room of a heat treatment device, in a stoichiometric ratio to one another such that the sum S of the mass ratios of the mass of the individual starting materials m n to mass of the source material air m L , so gives a value in the range 0.2 to 4, preferably 0.5 to 2.0.
  • a treatment gas is created that essentially consists of carbon monoxide, Hydrogen and nitrogen exist, to which any nitrogen content can be added by adding more nitrogen than the nitrogen content already present in the air.
  • the method according to the invention represents a method which contains many advantages of the previously known methods.
  • the proposed method takes advantage of the economic advantage that is obtained by using inexpensive hydrocarbon gas, for example natural gas, methane, propane, butane, for atmosphere production, while on the other hand, the simplicity of atmosphere generation by introducing the starting materials into suitable, problem-free areas the stoichiometrically exact ratio of variable proportions preserved in the heat treatment device remains without disadvantages, as mentioned at the outset.
  • the reaction processes also appear to be positively influenced by the adjacent introduction of the starting media, in particular hydrocarbon gas and alcohol. Temperatures of about 700 ° C. and more are necessary in the treatment room of the heat treatment device.
  • the alcohol is atomized into the furnace with nitrogen and / or air, with the other starting materials being supplied in a suitable amount in a manner directly surrounding the atomizing jet in a manner that surrounds the atomizing jet.
  • the carbon potential of the treatment gas atmosphere generated according to the invention is regulated via the natural gas and / or air component supplied, the regulation being carried out by measuring a size of the atmosphere which characterizes the carbon potential and by correspondingly varying one or both of the relevant components.
  • the carbon potential can also be influenced by an additional addition of a further hydrocarbon medium, in particular a further hydrocarbon gas, to the treatment room of the heat treatment device, the carbon potential of the atmosphere being determined by means of a variable which characterizes the carbon potential, such as the carbon dioxide, water or oxygen content the atmosphere.
  • a further hydrocarbon medium in particular a further hydrocarbon gas
  • the alcohol is evaporated before being fed to the heat treatment device and mixed with the other starting materials in gaseous form and this finished premix is introduced into the treatment room.
  • the reaction of the starting materials can also be carried out according to the invention supported by a catalyst, for example in that the reaction of the hydrocarbon gas with the air is carried out immediately upon entry into the treatment room by a catalyst arranged there or in that the alcohol is fed to the treatment room.
  • the heat treatment device evaporates and is mixed together with the other starting materials in gaseous form, and this mixture is converted into treatment gas as soon as it enters the treatment room with the aid of a catalyst arranged there.
  • catalyst variants are particularly advantageous for processes at the lower temperature threshold and guarantee the complete conversion of the starting materials.
  • a pipe 10 opens into a furnace 1, of which only part of the furnace wall is shown in the drawing.
  • An injector 2 is attached to the pipe via a first orifice 5 and a second orifice 6 with a gland head 7 with a seal 8 and a union nut 9 10 connected.
  • the injector 2 projects coaxially into the tube 10 at a distance from the tube 10 and the tube 11 of the second orifice approximately to the level of the inside of the furnace wall.
  • Supply lines for one of the output gases can be coupled to the introduction pieces 5 and 6.
  • the injector 2 has two inputs 3 and 4. Via the input 3, the injector is fed with nitrogen in a controllable manner via a line (not shown).
  • the nitrogen enters a mixing nozzle at high speed and sucks in methanol via inlet 4 and a line (also not shown).
  • the mist-shaped mixture of nitrogen and fine methanol droplets flows inside the injector 2 at high speed to the furnace and enters it in a jet.
  • the jet When entering the furnace, the jet is surrounded by a premixed mixture of natural gas and air in the form of a jacket, which is introduced via the mouthpiece 6 with the associated pipe 11. Via the mouthpiece 5, further nitrogen is also supplied up to a desired nitrogen content.
  • the throughput of all streams in this injection device is basically adjustable.
  • the treatment gas consisting essentially of carbon monoxide, hydrogen and nitrogen can thus be regulated as desired, particularly with regard to its carbon potential.
  • an increase in the proportion of the hydrocarbon gas in the starting mixture leads to an increase in the carbon potential
  • the increase in the proportion of air leads to a reduction in the carbon potential.
  • the method according to the invention is thus particularly suitable for the carburizing and carbon-neutral annealing of ferrous metal workpieces and - with suitable control - can also be used for decarburizing annealing processes.
  • the method according to the invention thus represents a versatile and economically advantageous method.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Tunnel Furnaces (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Claims (7)

1. Procédé pour la fabrication d'une atmosphère gazeuse de traitement dans une installation de traitement thermique par pyrogénation de matières de départ introduites dans la chambre de traitement d'une installation de traitement thermique, caractérisé en ce que simultanément et dans le voisinage immédiat les uns des autres, un gaz hydrocarbure, de l'alcool, de l'air et de l'azote sont introduits dans la chambre de traitement d'une installation de traitement thermique et cela dans des rapports mutuels stoechiométriques de telle sorte que la somme S des rapports de masse de la masse de chaque matière de départ mn à la masse de l'air de départ mL, soit:
Figure imgb0006
 prenne une valeur comprise entre 0,2 et 4, de préférence entre 0,5 et 2.
2. Procédé selon la revendication 1, caractérisé en ce que l'alcool pulvérisé par de l'azote et/ou de l'air est introduit dans le four tandis qu'à proximité immédiate et de façon à envelopper le jet de pulvérisation, les autres matériaux de départ sont également introduits dans le four en quantité appropriée.
3. Procédé selon l'une des revendications 1 à 2, caractérisé en ce que le potentiel de carbone du gaz en traitement est régulé au-dessus de la teneur en gaz naturel et/ou de la teneur en air introduits tandis que le réglage du potentiel de carbone de l'atmosphère a lieu au moyen d'une grandeur de l'atmosphère devant caractériser le niveau de carbone par variation d'une ou des deux teneurs.
4. Procédé selon l'une des revendications 1 à 2, caractérisé en ce que la régulation du potentiel en carbone est obtenue par addition supplémentaire d'un autre agent contenant un hydrocarbure, en particulier un autre gaz hydrocarbure, le potentiel en carbone de l'atmosphère étant réglé au moyen de la grandeur de ladite atmosphère devant indiquer le niveau en carbone par variation de l'addition de l'hydrocarbure supplémentaire.
5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'alcool est vaporisé avant d'être amené à l'installation de traitement thermique et est mélangé sous forme gazeuse avec les autres matériaux de départ (sortie) et en ce que ce mélange est introduit dans la chambre de traitement.
6. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la réaction du gaz hydrocarbure avec l'air est exécutée directement lors de l'entrée dans la chambre de traitement avec adjonction d'un catalyseur qui y est disposé.
7. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'alcool est vaporisé avant d'être amené à l'installation de traitement thermique et est mélangé avec les autres matières de départ (sortie) sous forme gazeuse et en ce que ce mélange est directement transformé en gaz de traitement lors de l'entrée dans la chambre de traitement avec l'aide d'un catalyseur qui y est disposé.
EP89116228A 1988-09-08 1989-09-02 Procédé pour produire une atmosphère pour le traitement gazeux dans un appareil pour le traitement thermique Expired - Lifetime EP0364709B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89116228T ATE77841T1 (de) 1988-09-08 1989-09-02 Verfahren zur herstellung einer behandlungsgasatmosphaere in einer waermebehandlungseinrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3830559 1988-09-08
DE3830559A DE3830559C1 (fr) 1988-09-08 1988-09-08

Publications (2)

Publication Number Publication Date
EP0364709A1 EP0364709A1 (fr) 1990-04-25
EP0364709B1 true EP0364709B1 (fr) 1992-07-01

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ID=6362549

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EP89116228A Expired - Lifetime EP0364709B1 (fr) 1988-09-08 1989-09-02 Procédé pour produire une atmosphère pour le traitement gazeux dans un appareil pour le traitement thermique

Country Status (5)

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EP (1) EP0364709B1 (fr)
AT (1) ATE77841T1 (fr)
DE (2) DE3830559C1 (fr)
ES (1) ES2033500T3 (fr)
PT (1) PT91642B (fr)

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* 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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH643597A5 (de) * 1979-12-20 1984-06-15 Maag Zahnraeder & Maschinen Ag Verfahren zum regelbaren aufkohlen oder erwaermen in schutzgas von werkstuecken aus stahl.
DE3037643A1 (de) * 1980-10-04 1982-05-13 Linde Ag, 6200 Wiesbaden Verfahren und vorrichtung zum entkohlenden oder kohlungsneutralen gluehen von metallteilen
DE3422608A1 (de) * 1984-06-18 1985-12-19 Linde Ag, 6200 Wiesbaden Verfahren und vorrichtung zum herstellen einer kohlenmonoxid und wasserstoff enthaltenden gasatmosphaere

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PT91642B (pt) 1995-08-09
ES2033500T3 (es) 1993-03-16
DE58901774D1 (de) 1992-08-06
ATE77841T1 (de) 1992-07-15
PT91642A (pt) 1990-03-30
EP0364709A1 (fr) 1990-04-25
DE3830559C1 (fr) 1989-03-09

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