WO2002033131A1 - Procede et dispositif pour produire un gaz de traitement contenant du co et de l'h2, pour traitement thermique - Google Patents

Procede et dispositif pour produire un gaz de traitement contenant du co et de l'h2, pour traitement thermique Download PDF

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Publication number
WO2002033131A1
WO2002033131A1 PCT/EP2001/011672 EP0111672W WO0233131A1 WO 2002033131 A1 WO2002033131 A1 WO 2002033131A1 EP 0111672 W EP0111672 W EP 0111672W WO 0233131 A1 WO0233131 A1 WO 0233131A1
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WO
WIPO (PCT)
Prior art keywords
gas
nitrogen
mixture
oxygen
gas mixture
Prior art date
Application number
PCT/EP2001/011672
Other languages
German (de)
English (en)
Inventor
Bernd Kleinpass
Original Assignee
Linde Ag
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 Ag filed Critical Linde Ag
Priority to AU2002220607A priority Critical patent/AU2002220607A1/en
Publication of WO2002033131A1 publication Critical patent/WO2002033131A1/fr

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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
    • C21D1/763—Adjusting the composition of the atmosphere using a catalyst

Definitions

  • the invention relates to a method for producing a CO and H 2 -containing treatment gas for the heat treatment of metallic material at high temperatures, in which on the basis of the catalytic reaction of a hydrocarbon gas (mixture) with an oxygen and nitrogen-containing gas mixture Treatment gas is formed, the catalytic reaction taking place in one or more catalyst retorts.
  • the invention relates to a device for generating a CO and H 2 -containing treatment gas for the heat treatment of metallic material at high temperatures, comprising at least one catalyst retort.
  • the invention relates to a heat treatment plant for carrying out a heat treatment, a treatment gas containing CO and H 2 being used at least in partial areas of the heat treatment process taking place in the heat treatment plant.
  • Known heat treatment processes for metallic material are generally carried out at high temperatures - preferably in the range from 500 to 1100 ° C. in atmospheres containing CO and H 2 .
  • the required treatment gas is formed on the basis of the catalytic reaction of a hydrocarbon gas (mixture) with an oxygen-containing gas mixture.
  • the known gas generators for generating reaction or protective gas atmospheres for the heat treatment of metals consist of a highly heat-resistant metallic retort shell into which the catalytically active material is poured in the form of bulk material heated and kept at the desired operating temperature with continuous energy supply
  • Such gas generators generate between 8 and 300 Nm 3 / h of reaction gas in industrial heat treatment
  • the object of the present invention is a generic method and a generic device for generating a CO and H 2 -containing treatment gas based on the catalytic conversion of a
  • a method for producing a CO and H 2 -containing treatment gas is proposed, which is characterized in that the gas mixture containing oxygen and nitrogen is heated, then with the hydrocarbon gas (mixture) mixed and the or the catalyst retorts is supplied.
  • the device according to the invention corresponding to this alternative for generating a treatment gas containing CO and H 2 is characterized by a heater which serves to heat an oxygen and nitrogen-containing gas mixture, and a mixing station connected downstream of the heater and upstream of the catalyst retort (s) the mixed oxygen and nitrogen-containing gas mixture is mixed with a hydrocarbon gas (mixture).
  • the gas mixture containing oxygen and nitrogen is mixed with the hydrocarbon gas (mixture) only after the gas mixture containing oxygen and nitrogen has been heated.
  • the heating temperature to be achieved can depend on the oxygen content in the oxygen and Nitrogen-containing gas mixture and the desired CO / CO 2 ratio in the treatment gas can be varied
  • the gas mixture containing oxygen and nitrogen is first mixed with the hydrocarbon gas (mixed), then heated and fed to the catalyst retort (s)
  • the device according to the invention for producing a CO and H 2 -containing treatment gas corresponding to this alternative is characterized by a mixing station in which an oxygen and nitrogen-containing gas mixture is mixed with a hydrocarbon gas (mixture) and a heater which is used to heat the mixed gas mixture before it is fed into the catalyst retort (s)
  • Carbocat process the advantage that due to the heating of the oxygen and nitrogen-containing gas mixture together with the hydrocarbon gas (gem ⁇ sch) on the one hand, controlled heating to a certain temperature can take place and on the other hand, the heating locally decoupled from the actual catalyst or Catalyst retort takes place, which enables the increase in performance
  • the gas mixture containing oxygen and nitrogen be formed by means of a cryogenic, adsorptive and / or permeative separation unit
  • cryogenic, adsorptive or permeative on-site system can be used, for example, to enrich the air with nitrogen
  • Oxygen / nitrogen gas mixture are generated.
  • Such an oxygen / nitrogen gas mixture has, for example, an oxygen content between 0.5 and 10% and a nitrogen content between 90 and 99.5%. Because such an on-site system is designed for an oxygen operating value that can not be deviated from due to technical and economic reasons can durcii da The admixing of air, (pure) oxygen or (pure) nitrogen can easily and quickly also set oxygen concentrations in the oxygen / nitrogen gas mixture that deviate significantly from the design point.
  • the amount of hydrocarbons mixed with the heated oxygen and nitrogen-containing gas mixture depends on the desired CO / CO 2 ratio in the treatment gas to be generated. Together with the oxygen concentration in the nitrogen / oxygen gas mixture, this results in the sum of the reactive components CO, CO 2 and H 2 in the heat treatment gas.
  • a further advantageous embodiment of the method according to the invention is characterized in that the hydrocarbon gas (mixture) is also heated before being mixed with the heated oxygen and nitrogen-containing gas mixture.
  • the oxygen and nitrogen containing gas mixture is preferably heated to a temperature between 400 and 950 ° C
  • the hydrocarbon gas (mixture) preferably heated up to a temperature of 600 C C.
  • the large temperature range for the gas mixture containing oxygen and nitrogen can be explained by the fact that the oxygen content in the gas mixture, together with the preheating temperature, changes the catalyst temperature considerably.
  • the figure shows a heat treatment system or a furnace W which has an inlet zone a, the actual treatment zone b and an outlet zone c.
  • the heat treatment system is passed through by the workpieces to be treated in the direction shown by arrows d and d '.
  • One or more catalyst retorts K are arranged in the area of the treatment zone b of the heat treatment system W; For the sake of clarity, only one catalyst retort K is shown in the figure.
  • Ambient air is fed via line 1 to a cryogenic, adsorptive or permeative separation unit T.
  • a cryogenic, adsorptive or permeative separation unit T On the basis of the treatment gas compositions to be generated, on-site membrane separation systems are particularly suitable for producing an oxygen / nitrogen gas mixture which has a higher nitrogen content than the air.
  • the separation unit T will be of one stage; in principle, however, multi-stage separation units can also be used.
  • a gas mixture enriched with nitrogen in relation to the air is drawn off from the separation unit T via line 2, said gas mixture comprising, for example, 95% nitrogen and 5%
  • This gas mixture is now fed to the heater E and heated to 800 ° C. in the latter, for example.
  • the heated oxygen / nitrogen gas mixture is withdrawn from the heater E via line 3.
  • a hydrocarbon gas (mixture) - for example natural gas - is fed via line 4 to the heated oxygen / nitrogen gas mixture.
  • the hydrocarbon gas (mixture) is preferably supplied only shortly before the catalytically active composition in order to avoid premature thermal decomposition.
  • a mixing station not shown in the figure, is provided, by means of which the amounts of the hydrocarbon gas (mixture) and the oxygen / nitrogen gas mixture can be adjusted.
  • the gas mixture thus obtained consisting of hydrocarbons, oxygen and nitrogen, is then fed via line 5 to the catalyst retort (s) K.
  • s catalyst retort
  • Treatment gas generated which has, for example, 8% carbon monoxide, 0.2% carbon dioxide, 16% hydrogen and about 75% nitrogen.
  • the inlet zone a and the outlet zone c of the heat treatment system W can also be supplied with nitrogen (low in oxygen), as is also the case with the carbocate process described above.
  • the oxygen / nitrogen gas mixture can be preheated either alone or together with the hydrocarbon gas (mixture).
  • the amount of treatment gas, the carbon monoxide content in the treatment gas, the CO / CO 2 ratio, etc. can be varied within a comparatively wide range.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour produire un gaz de traitement contenant du CO et de l'H2 en vue du traitement thermique d'un matériau métallique à haute température. Selon ledit procédé, le gaz de traitement est formé par conversion catalytique d'un ou de plusieurs hydrocarbures gazeux avec un mélange gazeux contenant de l'oxygène et de l'azote, la conversion catalytique ayant lieu dans une ou plusieurs chambres catalytiques. Selon une première version de l'invention, le mélange gazeux contenant de l'oxygène et de l'azote (1, 2) est d'abord chauffé (E), il est ensuite mélangé avec le ou les hydrocarbures gazeux (4) et acheminé dans la ou les chambres catalytiques (K). Selon une deuxième version de l'invention, le mélange gazeux contenant de l'oxygène et de l'azote est d'abord mélangé avec le ou les hydrocarbures gazeux, puis il est chauffé et acheminé dans la ou les chambres catalytiques. Cette invention permet de varier dans une mesure relativement large la quantité de gaz de traitement, la teneur de ce dernier en monoxyde de carbone, le rapport CO/CO2, etc.
PCT/EP2001/011672 2000-10-16 2001-10-09 Procede et dispositif pour produire un gaz de traitement contenant du co et de l'h2, pour traitement thermique WO2002033131A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002220607A AU2002220607A1 (en) 2000-10-16 2001-10-09 Method and device for producing a treatment gas containing co and h2,for thermal treatment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10051203.8 2000-10-16
DE2000151203 DE10051203A1 (de) 2000-10-16 2000-10-16 Verfahren und Vorrichtung zur Erzeugung eines CO- und H2-haltigen Behandlungsgases für die Wärmebehandlung

Publications (1)

Publication Number Publication Date
WO2002033131A1 true WO2002033131A1 (fr) 2002-04-25

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Application Number Title Priority Date Filing Date
PCT/EP2001/011672 WO2002033131A1 (fr) 2000-10-16 2001-10-09 Procede et dispositif pour produire un gaz de traitement contenant du co et de l'h2, pour traitement thermique

Country Status (3)

Country Link
AU (1) AU2002220607A1 (fr)
DE (1) DE10051203A1 (fr)
WO (1) WO2002033131A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1950722A1 (de) * 1969-10-08 1971-04-15 Hirt Comb Enginecrs Verfahren und Vorrichtung zur Erzeugung von Gasen mit vorausbestimmten Eigenschaften
DE2822048A1 (de) * 1978-05-20 1979-11-22 Loi Ind Ofenanlagen Anlage zur erzeugung von behandlungsgas
WO1993021350A1 (fr) * 1992-04-13 1993-10-28 Messer Griesheim Gmbh Procede de fabrication d'un gaz protecteur ou reactionnel pour le traitement thermique de metaux
EP0603799A2 (fr) * 1992-12-22 1994-06-29 Air Products And Chemicals, Inc. Procédé pour la production d'atmosphères de traitement thermique
US5441581A (en) * 1994-06-06 1995-08-15 Praxair Technology, Inc. Process and apparatus for producing heat treatment atmospheres
EP0778354A1 (fr) * 1995-12-07 1997-06-11 Linde Aktiengesellschaft Procédé d'alimentation de gaz protecteur dans un four de traitement thermique et installation de traitement thermique
EP0802263A1 (fr) * 1996-04-19 1997-10-22 The Boc Group, Inc. Formation d'atmosphères pour traitement thermique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1950722A1 (de) * 1969-10-08 1971-04-15 Hirt Comb Enginecrs Verfahren und Vorrichtung zur Erzeugung von Gasen mit vorausbestimmten Eigenschaften
DE2822048A1 (de) * 1978-05-20 1979-11-22 Loi Ind Ofenanlagen Anlage zur erzeugung von behandlungsgas
WO1993021350A1 (fr) * 1992-04-13 1993-10-28 Messer Griesheim Gmbh Procede de fabrication d'un gaz protecteur ou reactionnel pour le traitement thermique de metaux
EP0603799A2 (fr) * 1992-12-22 1994-06-29 Air Products And Chemicals, Inc. Procédé pour la production d'atmosphères de traitement thermique
US5441581A (en) * 1994-06-06 1995-08-15 Praxair Technology, Inc. Process and apparatus for producing heat treatment atmospheres
EP0778354A1 (fr) * 1995-12-07 1997-06-11 Linde Aktiengesellschaft Procédé d'alimentation de gaz protecteur dans un four de traitement thermique et installation de traitement thermique
EP0802263A1 (fr) * 1996-04-19 1997-10-22 The Boc Group, Inc. Formation d'atmosphères pour traitement thermique

Also Published As

Publication number Publication date
AU2002220607A1 (en) 2002-04-29
DE10051203A1 (de) 2002-04-25

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