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EP0458183A2 - Procédé pour la mise à disposition de gaz de traitement pour traitements thermiques - Google Patents

Procédé pour la mise à disposition de gaz de traitement pour traitements thermiques Download PDF

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Publication number
EP0458183A2
EP0458183A2 EP91107868A EP91107868A EP0458183A2 EP 0458183 A2 EP0458183 A2 EP 0458183A2 EP 91107868 A EP91107868 A EP 91107868A EP 91107868 A EP91107868 A EP 91107868A EP 0458183 A2 EP0458183 A2 EP 0458183A2
Authority
EP
European Patent Office
Prior art keywords
catalyst
retort
furnace
treatment gas
catalyst retort
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.)
Granted
Application number
EP91107868A
Other languages
German (de)
English (en)
Other versions
EP0458183B1 (fr
EP0458183A3 (en
Inventor
Peter Dr.-Ing. Vocke
Reinhard Dipl.-Ing. Strigl
Thomas Dipl.-Ing. Mahlo
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
Publication of EP0458183A2 publication Critical patent/EP0458183A2/fr
Publication of EP0458183A3 publication Critical patent/EP0458183A3/de
Application granted granted Critical
Publication of EP0458183B1 publication Critical patent/EP0458183B1/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
    • C21D1/763—Adjusting the composition of the atmosphere using a catalyst

Definitions

  • the invention relates to a method for providing treatment gas in heat treatments, the treatment gas being generated in a catalyst retort which is arranged in an associated furnace and is at furnace temperature, and a corresponding device.
  • the object of the present invention results from this background and consists in improving a method according to the preamble of claim 1 and known catalyst retorts so that the usability in the direction of lower operating temperatures in heat treatments is expanded.
  • the catalyst retort which is to be arranged implicitly in the furnace is surrounded in the furnace by a shield, the treatment gas emerging from the catalyst retort being first introduced into the shield and only then being released into the furnace space.
  • the catalyst retort is isolated from the gas atmosphere in the furnace interior by the fact that the freshly generated treatment gas is temporarily held in the shielded, enveloped catalyst retort.
  • a higher degree of heating of the catalyst mass in the catalyst retort can be maintained even at furnace temperatures below 750 ° C., so that the complete conversion of the feed gas into the treatment gas remains guaranteed.
  • the heating output can be set lower than without shielding.
  • An advantageous embodiment of the invention for the frequently occurring tubular catalyst retorts derived from a radiant heater tube is that they are surrounded by a likewise essentially tubular shield (11) which surrounds the catalyst retort at a distance, the treatment gas before it is introduced into the interior of the furnace is routed as far as possible within the shield.
  • a device according to the invention with an essentially tubular catalyst retort with jacket tube, heating, catalyst material and gas supply and discharge devices as well as gas outlet openings for the treatment gas generated is characterized in that with the substantially tubular actual catalyst retort, a cladding tube (11) or other profile which is selected in cross section is connected such that the catalyst retort is arranged approximately coaxially and centered in this cladding tube or profile this results in a free space (14) surrounding the catalyst retort, the cladding tube or profile being equipped with passage openings for the treatment gas trapped therein.
  • a particularly advantageous embodiment is that the passage openings (15) are arranged in the cladding tube or profile in such a way that the flow path of the newly formed treatment gas in the cladding tube or profile is as long as possible.
  • This configuration ensures that the treatment gas which is at a higher temperature level and which emerges freshly from the catalyst retort remains in the vicinity of the retort for as long as possible and is thus kept at a higher temperature level.
  • the figure shows a device according to the invention installed between two walls 6, 7 of a heat treatment system, with a catalyst retort 1, internal heating 2 and a shielding cladding tube 11.
  • the essentially tubular catalyst retort 1 is equipped with a feed line 8 for the feed gas, which, for example, consists of a mixture Natural gas and air can be.
  • the internal volume of retort 1 is largely with Filled catalyst material 9, which ensures the conversion of the feed gas into the treatment gas.
  • outlet openings 10 are provided for the converted gas.
  • the feed gas passes through the catalyst material 9 located in the catalyst retort and exits the retort as treatment gas through the gas outlet openings 10.
  • the internal heating 2 is arranged centrally in the catalyst retort, which can consist of a burner with fuel gas mixture supply 16 and exhaust gas line 17.
  • the entire catalyst retort 1 is surrounded by the cladding tube 11 and is fastened coaxially and centered therein with a strut cross 12 and a flange 13. Because of the larger, cheap about 1.1 to twice the diameter of the cladding tube, there is a free space 14 between the catalyst retort and the cladding tube. Passage openings 15 are provided in the cladding tube 11 approximately at the opposite end to the end at which the gas outlet openings 10 are located on the retort itself. As a result, almost the entire length of the outside of the retort is only in contact with fresh, newly created, warmer treatment gas that flows in continuously.
  • the sequence according to the invention is now as follows: If heat treatment is to be carried out at temperatures, for example around 750 ° C, under protective gas, e.g. an annealing treatment of metallic workpieces, whereby the heat treatment system can be a continuous furnace, then the problems described at the outset occur in a conventional design with the protective gas generation via catalyst retorts. incomplete conversion of the feed gas into treatment gas and risk of burning if the heating output is too high. Under Using the method according to the invention and the device, however, it is possible to provide treatment gas without problems.
  • protective gas e.g. an annealing treatment of metallic workpieces
  • a heating of the catalyst material in the retort is achieved at an approximately 10 to 20% higher level than if a catalyst retort were used without the jacket tube 11 essential to the invention.
  • the natural gas-air feed gas flows through the feed line 8 in the cold state of the catalyst mass 9 and converts there after heating in, for example, CO / H2 / N2-containing treatment gas, which passes through the gas outlet openings 10 at the top of the catalyst retort 1 the cladding tube 11 flows into shielded free space 14.
  • the treatment gas flows to the foot end of the catalyst retort in this shielded free space, since the through bores 15 of the cladding tube 11 are located there. Through this, the treatment gas finally enters the furnace interior. In this way, thermal insulation of the catalyst retort towards the furnace interior is achieved, as a result of which the above-mentioned increase in the temperature level in the catalyst retort and thus an objective essential to the invention is achieved.
  • a further, additional advantage is that the procedure according to the invention or the implementation of the invention in terms of the device results in the possibility that the replacement of a catalyst retort can be considerably simplified. If the device according to the invention is designed so that the cladding tube 11 is connected to the catalyst retort 1, for example on the flange 13 by a releasable screw connection 18, while the front end of the catalyst retort is only loosely lying on the support cross 12 in the cladding tube 11 is held, the catalyst retort can be replaced practically while the treatment furnace is in operation, since the cladding tube 11 remains in the furnace and the latter is therefore still essentially closed. Thus, the catalyst retort is very easy to replace when the furnace is heated, which reduces costs for this type of operation.
  • the method according to the invention thus provides an expansion of the possible uses of treatment gas generation with catalyst retorts, which can be desired and advantageous in a number of practical cases, with additional progress being made with regard to the maintenance and repair friendliness of a heat treatment system.

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)
  • Furnace Details (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Tunnel Furnaces (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Catalysts (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Air Bags (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
EP91107868A 1990-05-19 1991-05-15 Procédé pour la mise à disposition de gaz de traitement pour traitements thermiques Expired - Lifetime EP0458183B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4016183 1990-05-19
DE4016183A DE4016183A1 (de) 1990-05-19 1990-05-19 Verfahren zur verbesserten bereitstellung von behandlungsgas bei waermebehandlungen

Publications (3)

Publication Number Publication Date
EP0458183A2 true EP0458183A2 (fr) 1991-11-27
EP0458183A3 EP0458183A3 (en) 1992-04-01
EP0458183B1 EP0458183B1 (fr) 1994-12-07

Family

ID=6406799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107868A Expired - Lifetime EP0458183B1 (fr) 1990-05-19 1991-05-15 Procédé pour la mise à disposition de gaz de traitement pour traitements thermiques

Country Status (9)

Country Link
US (1) US5160380A (fr)
EP (1) EP0458183B1 (fr)
AT (1) ATE115192T1 (fr)
BR (1) BR9101982A (fr)
CZ (1) CZ285210B6 (fr)
DE (2) DE4016183A1 (fr)
ES (1) ES2067795T3 (fr)
HU (1) HU209813B (fr)
ZA (1) ZA913797B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686701A1 (fr) * 1994-06-06 1995-12-13 Praxair Technology, Inc. Procédé et dispositif pour la production d'atmosphères pour traitement thermique
EP0860512A3 (fr) * 1997-02-25 1998-09-23 Linde Aktiengesellschaft Procédé/appareil pour la préparation d'un gaz de traitement pour le traitement d'un produit métallique

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5221369A (en) * 1991-07-08 1993-06-22 Air Products And Chemicals, Inc. In-situ generation of heat treating atmospheres using non-cryogenically produced nitrogen
US5417774A (en) * 1992-12-22 1995-05-23 Air Products And Chemicals, Inc. Heat treating atmospheres
US5284526A (en) * 1992-12-22 1994-02-08 Air Products And Chemicals, Inc. Integrated process for producing atmospheres suitable for heat treating from non-cryogenically generated nitrogen
US5298090A (en) * 1992-12-22 1994-03-29 Air Products And Chemicals, Inc. Atmospheres for heat treating non-ferrous metals and alloys
US5348592A (en) * 1993-02-01 1994-09-20 Air Products And Chemicals, Inc. Method of producing nitrogen-hydrogen atmospheres for metals processing
US5401339A (en) * 1994-02-10 1995-03-28 Air Products And Chemicals, Inc. Atmospheres for decarburize annealing steels
US5968457A (en) * 1994-06-06 1999-10-19 Praxair Technology, Inc. Apparatus for producing heat treatment atmospheres
US20070107818A1 (en) * 2005-11-16 2007-05-17 Bowe Donald J Deoxygenation of furnaces with hydrogen-containing atmoshperes
US8689707B2 (en) * 2006-05-26 2014-04-08 Fuel Tech, Inc. Ultra low NOx burner replacement system
US9157682B2 (en) 2011-02-10 2015-10-13 Linde Aktiengesellschaft Furnace atmosphere generator
EP2806241A1 (fr) 2013-05-23 2014-11-26 Linde Aktiengesellschaft Procédé de fourniture de méthanol destiné à une atmosphère de traitement thermique dans un four
KR101701328B1 (ko) * 2016-01-22 2017-02-13 한국에너지기술연구원 Rx 가스 발생기 내장형 무산화 열처리 설비

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535074A (en) * 1965-10-29 1970-10-20 Hitachi Ltd Method and apparatus for purifying crude inert gases
DE2420823A1 (de) * 1974-04-30 1975-11-13 Nassheuer Ind Ofenbau Jean Strahlrohrbeheitzter waerm- bzw. gluehofen
DD131292A1 (de) * 1977-03-28 1978-06-14 Arnd Mueller Einrichtung zur schutzgaserzeugung im ofenraum
US4398971A (en) * 1981-12-31 1983-08-16 Aga Aktiebolag Method of heating, holding or heat treatment of metal material
FR2524006B1 (fr) * 1982-03-23 1985-10-11 Air Liquide Procede de durcissement superficiel de pieces metalliques
US4417927A (en) * 1982-03-29 1983-11-29 General Electric Company Steel nitriding method and apparatus
DE3302338A1 (de) * 1983-01-25 1984-07-26 Ruhrgas Ag, 4300 Essen Verfahren zum haerten von metallwerkstuecken
DE3630833A1 (de) * 1986-09-10 1988-03-17 Linde Ag Verfahren und vorrichtung zur waermebehandlung metallischer werkstuecke
DE3632577A1 (de) * 1986-09-25 1988-05-05 Linde Ag Strahlrohrbrenner mit katalysatorbett fuer waermebehandlungsoefen
FR2649123B1 (fr) * 1989-06-30 1991-09-13 Air Liquide Procede de traitement thermique de metaux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686701A1 (fr) * 1994-06-06 1995-12-13 Praxair Technology, Inc. Procédé et dispositif pour la production d'atmosphères pour traitement thermique
EP0860512A3 (fr) * 1997-02-25 1998-09-23 Linde Aktiengesellschaft Procédé/appareil pour la préparation d'un gaz de traitement pour le traitement d'un produit métallique

Also Published As

Publication number Publication date
DE59103752D1 (de) 1995-01-19
EP0458183B1 (fr) 1994-12-07
US5160380A (en) 1992-11-03
CZ285210B6 (cs) 1999-06-16
HU911656D0 (en) 1991-11-28
ZA913797B (en) 1992-02-26
CS144991A3 (en) 1992-01-15
HUT61055A (en) 1992-11-30
ATE115192T1 (de) 1994-12-15
EP0458183A3 (en) 1992-04-01
DE4016183A1 (de) 1991-11-21
HU209813B (en) 1994-11-28
ES2067795T3 (es) 1995-04-01
BR9101982A (pt) 1991-12-24

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