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 PDFInfo
- 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
Links
- 230000001681 protective effect Effects 0.000 title claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 7
- 239000002184 metal Substances 0.000 title claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title description 3
- -1 ferrous metals Chemical class 0.000 title description 3
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000002737 fuel gas Substances 0.000 claims abstract description 4
- 150000002739 metals Chemical class 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 13
- 239000003345 natural gas Substances 0.000 abstract description 6
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000001294 propane Substances 0.000 abstract description 2
- LBPGGVGNNLPHBO-UHFFFAOYSA-N [N].OC Chemical compound [N].OC LBPGGVGNNLPHBO-UHFFFAOYSA-N 0.000 description 5
- 238000000137 annealing Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000005255 carburizing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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)
caractérisé en ce
qu'on ne dépasse pas une température de combustion de 750°C dans le tube-enveloppe de rayonnement.
caractérisé en ce que
la combustion du gaz combustible contenant des hydrocarbures se fait à rapport stoechiométrique 1 = 1.
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)
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)
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 |
-
1988
- 1988-03-11 DE DE3808146A patent/DE3808146A1/de not_active Withdrawn
-
1989
- 1989-02-13 AT AT89102430T patent/ATE78877T1/de active
- 1989-02-13 EP EP89102430A patent/EP0331929B1/fr not_active Expired - Lifetime
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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