EP0074615A2 - Four industriel à convection d'air pour le traitement thermique - Google Patents

Four industriel à convection d'air pour le traitement thermique Download PDF

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Publication number
EP0074615A2
EP0074615A2 EP82108284A EP82108284A EP0074615A2 EP 0074615 A2 EP0074615 A2 EP 0074615A2 EP 82108284 A EP82108284 A EP 82108284A EP 82108284 A EP82108284 A EP 82108284A EP 0074615 A2 EP0074615 A2 EP 0074615A2
Authority
EP
European Patent Office
Prior art keywords
batch
furnace
industrial furnace
elements
air flow
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.)
Withdrawn
Application number
EP82108284A
Other languages
German (de)
English (en)
Other versions
EP0074615A3 (fr
Inventor
Horst Ing. Gillhaus (Grad.)
Fritz Dipl.-Ing. Hegewaldt
Wolfgang Faber
Jürgen Ing. Baer (grad.)
Ernst Dr. Dipl.-Ing. Toplak
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.)
EON Ruhrgas AG
Original Assignee
BBC Brown Boveri AG Germany
Ruhrgas 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 BBC Brown Boveri AG Germany, Ruhrgas AG filed Critical BBC Brown Boveri AG Germany
Publication of EP0074615A2 publication Critical patent/EP0074615A2/fr
Publication of EP0074615A3 publication Critical patent/EP0074615A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B17/00—Furnaces of a kind not covered by any preceding group
    • F27B17/0016—Chamber type furnaces
    • F27B17/0083—Chamber type furnaces with means for circulating the atmosphere
    • 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
    • C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers

Definitions

  • the invention relates to an industrial furnace with air circulation for heat treatment processes with high temperature uniformity within a batch to be treated, which is arranged or stacked with the aid of intermediate layers so that the circulated hot air thoroughly washed around the batch.
  • the object of the invention is therefore to improve the chamber furnace in such a way that an increase in the flow rate is possible while simultaneously shortening the heating time and reducing the temperature differences during the heating and during the annealing treatment.
  • the elements influencing the air flow become rigid or movable, e.g. arranged pivotable.
  • the elements influencing the air flow may be appropriate to adapt the elements influencing the air flow to the shape of the batch elements so that they practically represent a mirror element of the outer surface of the batch.
  • 1 to 6 show an embodiment of the invention.
  • the circulating air is forced through the batch from above. It should already be pointed out that the invention can also be applied to furnaces with longitudinal circulation of the air.
  • the batch 1 to be treated which is located in the treatment room 2, consists in the selected exemplary embodiment of cast or pressed round aluminum bars 3, as can be seen particularly in FIGS. 4 to 6, which, by means of a transport device (not shown), is placed on a grid frame arranged in the furnace 4 are discontinued.
  • the individual round aluminum bars 3 are stacked on the base 5, which is placed on the grid frame 4 or another support in the furnace by the transport device, in each case by inserting intermediate layers 6.
  • the gap 8 between the batch 1 which has been driven into the furnace for homogenization and removed from the furnace after the heat treatment and the fixed furnace inner walls 7 must be approximately 100 mm. Inaccurate mode of transport, tolerances in furnace construction, in the stacking of the goods to be treated. Deformations of the Furnace installations and expansions of the batch (in the exemplary embodiment shown there are thermal expansions of approximately 30 mm in width) require such a large gap. On the other hand, for economic reasons, the gap 9 between the individual aluminum ingots 3 should be considerably smaller than 100 mm, in the present case about 48 mm. These different gap sizes inevitably result in different flow resistances and thus also different flow velocities, and this means that the heat available on the side of the batch is considerably greater than in the batch itself.
  • the air flow velocity on the heating material is decisive. If a high temperature uniformity is also required during the heating process, it must be ensured that the air flow velocities on the individual workpieces are as equal as possible. In the chosen arrangement, with a space of low flow velocity in front of and behind the charge, this requires that the flow resistances for the airways lying parallel in the flow direction within the charge and between the charge and the furnace wall are approximately the same.
  • the distance between the wall and the side boundary of the stack of goods must not be less than a certain dimension.
  • the flow conditions on the door side and on the rear wall of the furnace are even more unfavorable.
  • the positioning of the batch is considerably more difficult and a gap 10 of approximately 200 mm on the rear wall and on the door side must be taken into account.
  • the linear expansion 12 of the aluminum round bars 3 is approximately 100 mm, which under certain circumstances can only occur on one side.
  • the door is usually equipped with a very complex and complicated opening kinematics.
  • a so-called backpack 11 is attached to the inside of the door in order to make the gap between the inside 29 of the door and the batch as small as possible.
  • the circulating air is pressed through the batch in the arrangement shown of four fans 13 and drawn in by an electric heating device 15 or a gas-operated heating device.
  • the treatment room 2 is separated from the fans 13 and the electric heater 15 only by an intermediate wall 14, which does not have to have an insulating effect.
  • the furnace housing consists, apart from the inner part of the side walls 7, of sufficient thermal insulation 16 and the outer furnace housing 17.
  • the air flow generated by the fans 13 is indicated by arrows 18.
  • the air stream emerging downward from batch 1 is fed back to the heating system by deflection parts 19, which are located below the batch.
  • the blowers 13 are driven by electric drive motors 20. In the upper part of the furnace there are also deflecting parts 21, which feed the air stream emerging from the blowers 13 to the batch 1.
  • the distance 23 should be approximately 100 mm, while approximately 50 mm were selected for the distance 24.
  • a scatter was achieved that the average flow velocities in these channels 23 and 9 differ by only about 5%, while without the flow-influencing internals at a distance of 100 mm between the furnace wall and the side of the batch, the flow velocities in this channel in Compared to that in the channels 9 between the rows of bolts is approximately 1.5 times.
  • the measure according to the invention thus amounts to an approximation of the mean flow velocities in the different channels, which results in an excellent homogenization in the heating behavior at the edge and in the middle of the batch due to the approximately equal heat transfer figures.
  • the elements are not fixedly arranged on the side wall, but the flaps 25, which are arranged in the manner of a louver, can be adjusted from the outside via a hydraulically or pneumatically rubbed cylinder 26 and a lever 27 after the batch has been moved into the furnace.
  • the flaps can also be adapted to the shape of the components of the batch, so that the same flow conditions as within the batch can be achieved here.
  • the flaps 25 be semicircular. On the end faces of the aluminum bars, however, it is more convenient to keep the flaps straight.
  • stops 28 are attached to the movable end of the flaps, which ensure a certain minimum gap.
  • the drive cylinder 26 is expediently spring-loaded, so that it can yield when the material to be treated is thermally expanded and the minimum gap is retained.
  • the elements in the gap must be arranged in such a way that they are perpendicular to the direction of flow of the air. For example, when the air is circulated lengthways, the elements must be arranged vertically.
EP82108284A 1981-09-16 1982-09-09 Four industriel à convection d'air pour le traitement thermique Withdrawn EP0074615A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813136667 DE3136667A1 (de) 1981-09-16 1981-09-16 Industrieofen mit luftumwaelzung fuer waermebehandlungsverfahren
DE3136667 1981-09-16

Publications (2)

Publication Number Publication Date
EP0074615A2 true EP0074615A2 (fr) 1983-03-23
EP0074615A3 EP0074615A3 (fr) 1984-05-23

Family

ID=6141761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82108284A Withdrawn EP0074615A3 (fr) 1981-09-16 1982-09-09 Four industriel à convection d'air pour le traitement thermique

Country Status (5)

Country Link
US (1) US4518352A (fr)
EP (1) EP0074615A3 (fr)
JP (1) JPS58123819A (fr)
CA (1) CA1190395A (fr)
DE (1) DE3136667A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638826A1 (fr) * 1988-11-04 1990-05-11 Bmi Fours Ind Four sous vide a pertes variables

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8317254D0 (en) * 1983-06-24 1983-07-27 Portmeirion Potteries Ltd Firing of ceramic ware
US4729735A (en) * 1986-05-01 1988-03-08 Seco/Warwick Corporation Vertical air flow ingot pusher furnace
US4676743A (en) * 1986-05-01 1987-06-30 Seco/Warwick Corporation Vertical air flow ingot pusher furnace
US4908231A (en) * 1986-09-08 1990-03-13 Bgk Finishing Systems, Inc. Automobile coating heat treating process
US4907533A (en) * 1986-09-08 1990-03-13 Bgk Finishing Systems, Inc. Automotive coating treatment apparatus with plural radiant lamps
US4771728A (en) * 1986-09-08 1988-09-20 Bgk Finishing Systems, Inc. Automotive coating treatment apparatus
US4941823A (en) * 1989-12-05 1990-07-17 Seco/Warwick Corporation Vertical air flow ingot pusher furnace with adjustable side baffles
TWI524044B (zh) 2011-12-28 2016-03-01 禾波國際股份有限公司 用於纖維熱處理之烤爐
USD839669S1 (en) * 2016-11-23 2019-02-05 Fusion Tech Integrated, Inc. Oven corner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971851C (de) * 1944-08-10 1959-04-09 Siemens Ag Elektrisch beheizter Umluftofen
US3304071A (en) * 1965-01-05 1967-02-14 Sunbeam Equip Metal billet homogenizing furnace
GB1231246A (fr) * 1967-07-21 1971-05-12
DE2712842A1 (de) * 1977-03-23 1978-09-28 Ki Vni I Pk I Avtomatizacii Pr Thermischer ofen mit zwangsumlauf von gas

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1762879A (en) * 1929-04-12 1930-06-10 Moritz L Mueller Method of and means for drying lumber
US1964115A (en) * 1932-05-03 1934-06-26 Goodall Charles Drying of timber and other materials
US2362847A (en) * 1942-08-24 1944-11-14 Continental Can Co Baffle wall structure for sheet drying or baking ovens
DE1206933B (de) * 1961-11-09 1965-12-16 Indugas Ges Fuer Ind Gasverwen Haubengluehofen fuer Schutzgasbetrieb
DE3035032C1 (de) * 1980-09-17 1982-08-26 Stahlwerke Röchling-Burbach GmbH, 6620 Völklingen Verfahren zum Waermebehandeln von Drahtbunden und Durchlaufofen zur Durchfuehrung des Verfahrens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971851C (de) * 1944-08-10 1959-04-09 Siemens Ag Elektrisch beheizter Umluftofen
US3304071A (en) * 1965-01-05 1967-02-14 Sunbeam Equip Metal billet homogenizing furnace
GB1231246A (fr) * 1967-07-21 1971-05-12
DE2712842A1 (de) * 1977-03-23 1978-09-28 Ki Vni I Pk I Avtomatizacii Pr Thermischer ofen mit zwangsumlauf von gas

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638826A1 (fr) * 1988-11-04 1990-05-11 Bmi Fours Ind Four sous vide a pertes variables

Also Published As

Publication number Publication date
EP0074615A3 (fr) 1984-05-23
JPS58123819A (ja) 1983-07-23
US4518352A (en) 1985-05-21
CA1190395A (fr) 1985-07-16
DE3136667A1 (de) 1983-03-24

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Effective date: 19860827

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Inventor name: HEGEWALDT, FRITZ, DIPL.-ING.

Inventor name: TOPLAK, ERNST, DR. DIPL.-ING.

Inventor name: GILLHAUS, HORST, ING. (GRAD.)

Inventor name: FABER, WOLFGANG

Inventor name: BAER, JUERGEN, ING. (GRAD.)