WO1985001519A1 - Procede de traitement thermique de metaux dans des fours a pots et des fours a hotte - Google Patents

Procede de traitement thermique de metaux dans des fours a pots et des fours a hotte Download PDF

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Publication number
WO1985001519A1
WO1985001519A1 PCT/DE1984/000198 DE8400198W WO8501519A1 WO 1985001519 A1 WO1985001519 A1 WO 1985001519A1 DE 8400198 W DE8400198 W DE 8400198W WO 8501519 A1 WO8501519 A1 WO 8501519A1
Authority
WO
WIPO (PCT)
Prior art keywords
recipient
fluidized beds
preheating device
cooling device
gas
Prior art date
Application number
PCT/DE1984/000198
Other languages
German (de)
English (en)
Inventor
Rainer Herdieckerhoff
Herbert Rediger
Original Assignee
Firma Dr. Werner Herdieckerhoff, Nachf.
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 Firma Dr. Werner Herdieckerhoff, Nachf. filed Critical Firma Dr. Werner Herdieckerhoff, Nachf.
Publication of WO1985001519A1 publication Critical patent/WO1985001519A1/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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C21D9/673—Details, accessories, or equipment peculiar to bell-type furnaces
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C21D9/667—Multi-station furnaces
    • C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere

Definitions

  • the invention relates to a method for heating, annealing and cooling metal batches with the aid of pot or hood furnaces, at least two of which are connected directly or indirectly via heat exchangers (US Pat. No. 3,184,225).
  • an annealing treatment is required during processing and deformation in order to achieve certain structural states between the individual production steps.
  • the metal products are heated in annealing furnaces with and without glow protection hoods (recipients) to a temperature corresponding to the desired structural condition and then cooled again outside the furnace.
  • glow protection hoods responsible for protecting the metal products.
  • the on cooling an fallen ⁇ de waste heat is here today, in most cases ver ⁇ lost because an effective return to the furnished compassionspro ⁇ process appeared so far difficult.
  • the applicant has developed the so-called double vacuum system for glowing in recipients.
  • the batch is in a recipient which can be evacuated. This is made of heat-resistant sheet metal
  • the cooling hoods are provided with water sprinkling systems and / or cooling air fans.
  • Replacement sheet OMPI than is transmitted to the workpiece by radiation and convection.
  • the heating is usually carried out by igniting a combustible gas mixture in the fluidized bed.
  • the object of the invention is to find a rationally operating method for hood or pot furnaces to be used in annealing technology, in which the losses in energy are reduced by suitable heat exchange methods.
  • the invention solves the stated problem by teaching teaching method claim 1. Its features combine a cold store which surrounds a hot batch to be cooled, and a preheating device which surrounds a still cool batch in a heat network.
  • annular chamber fluidized beds are provided, which ensure accelerated heat transfer from the recipient wall to the gas intended for heat exchange. This then transfers the heat to the charge in the preheating hood .
  • the use of fluidized beds optimizes heat exchange, even with an indirect mode of operation, without excluding direct heat or gas exchange.
  • the invention can help conventional annealing processes to a significantly increased economic efficiency.
  • the recipient with the annealing batch can be suspended from the annealing furnace and fed to the fluidized bed heat exchanger.
  • This can be designed as a combined cooling and heat exchange hood in hood furnaces, or as a combined cooling or heating - A -
  • the recipient spaces are initially excluded from the heat exchange system, but, as later features of the invention show, suitable measures can also include the recipient spaces. Difficulties arise with direct gas exchange because the cold batch inside the preheating hood recipient is not absolutely absolutely certain. This has the consequence that the inert gas is contaminated by drawing greases or the like. It can also cause unwanted oxygen or CO 2 emissions
  • the method according to claim 1 can be improved by claim 2 if the indirectly working heat exchange gases additionally flow through the jacket space between the recipient and the inner wall of the furnace, which is at least closed by double vacuum ovens.
  • Figure 2 shows a partial section through one of the devices with fluidized beds for the heat exchange system.
  • a cooling device 5 on the left and a preheating device 2 on the right are shown as hoods. These hoods are inside out with their walls 3 about the recipients 11 and 12 ge, under which the right the cool Charge 1 and left the hot, '4 is to be cooled batch.
  • the recipients 11 and 12 are connected in a vacuum-tight manner to a base construction 25, in which vacuum-tight circulation fans 23 ensure the gas circulation within the interior of the recipient 14 and 15.
  • Both hoods for the cooling device 5 and for the preheating device 2 can be provided with additional cover fans 24 arranged on the cover side.
  • the cooling device 5 can additionally have water sprinkling devices, which are not shown.
  • the passages of the cover fans 24 closable to the atmosphere in a vacuum-tight manner and at least the jacket space 7 of the cooling device 5 and preferably also the jacket space 8 of the preheating device 2 in the heat include the metal cycle.
  • fluidized beds 6 are provided on the inner wall 9, which are designed as ring chambers 18 arranged several times one above the other, the porous injection openings 21 in the upper wall 20 of the ring channels 19 or in the bottom of the ring chambers 18 are arranged.
  • WIPO "• may also apply between the wall 3 of the preheating device 2 and its inner wall 10.
  • the blowing speed within the fluidized beds 6 is set such that the solids (powdered aluminum oxide) cannot get into the line system 27 or the fan 16 via the outputs of the fluidized beds 6.
  • the regulation of the vertical air or gas flow velocity is therefore of crucial importance.
  • the insulated line system 27 is provided between the cooling device 5 and the preheating device 2.
  • the drawing does not show all the necessary routing variants. It is only intended to show that, depending on the process variant used, different arrangements are expedient.
  • the line layout shown in solid lines in FIG. 1 runs via the insulated line 13 and the circular line 17 from the area of the fluidized beds 6 of the cooling device 5 directly into the interior 14 of the recipient 12 for the preheating device 2.
  • a circulating fan 23 is circulated and, with simultaneous heating of the batch 1, is passed back to the fluidized beds 6 of the cooling device 5 via the fans 16.
  • the gas again absorbs heat removed from the hot charge 4 in these. Then the cycle repeats itself.
  • the interior 14 of the recipient 12 can be given an inert gas filling after alternating vacuum pulling and subsequent flushing and the line circuit can be selected such that an exchange circuit between the recipient interior 14 and 15 is done.
  • the gas circuit can also be subjected to heating in certain applications; this is done by an external heating device 26.
  • an external heating device 26 it is also possible to arrange internal heating devices 22 within the fluidized beds 6, preferably in the case of the preheating device 2. Such additional heating is less important in the cooling device 5, although this may also be expedient for procedural reasons.
  • the accelerated, internal heating within the preheating device 2 can also take place by means of combustion heating.
  • 6 combustible gas is introduced into their fluidized beds and ignited in a controlled manner.
  • the preheating processes can thus be considerably accelerated. Then the inclusion of the recipient interior 14, 15 is not useful.
  • the interiors 14, 15 of the recipients 11 and 12 could also be designed in the manner of known fluidized bed furnaces in such a way that the heat transfer fluid formed there both for heat dissipation and for heat supply can. It is particularly advantageous that the aluminum oxide used or other suitable chemically neutral solid particles cannot undergo chemical reactions with the batches, so that only the purity of the carrier gas or heat exchange gas used must be taken into account.
  • the line system 27, indicated by dash-dotted lines, with the flanges 28 is intended to indicate that the individual lines can be uncoupled for producing variable functional sequences. It is not necessary to describe further possible circuits because they result from the process sequences according to the invention or the
  • FIG. 2 only supplements FIG. 1.
  • the arrangement of the fluidized beds 6, the internal heating devices 22, the porous injection openings 21, the annular chambers 18 and the annular channels 19 and, marked by corresponding arrows, the possible circulation paths of the heat exchange gas are made clearer in the enlarged view.
  • the jacket space 7 is closed, but connected to the drainage channels 29 of the fluidized beds 6. It can be very advantageous if, unlike in FIG. 1, the cooled gas stream coming from the preheating device 2, without first flowing through the fluidized beds 6, flows through the jacket space lying between the recipient wall 30 and the inner wall 9 before the gas can flow into the annular channels 19 and from there via the porous inlet openings 21 into the annular chambers 18 of the fluidized beds 6.

Abstract

Dans un procédé de chauffe, de recuit et de refroidissement de charges enfermées dans des récipients, il est possible, lors du traitement thermique de métaux à l'aide de fours à pots ou de fours à hotte, d'économiser sur l'énergie thermique et le temps de recuit grâce au fait qu'un gaz froid provenant d'un dispositif de préchauffage (2) entourant une charge à chauffer (1), mais encore froide, traverse des lits fluidisés (6) disposés à l'intérieur de la paroi (3) d'un dispositif de refroidissement (5) entourant une charge chaude (4) à refroidir, lits dans lesquels se trouve l'oxyde d'aluminium, ou autre, pulvérisé et maintenu en état de flottement par le gaz s'écoulant verticalement et servant d'échangeur thermique, le gaz étant ensuite ramené dans le cycle par des conduites isolées de ventilateurs correspondants (16) du dispositif de préchauffage (2) pour servir de milieu de chauffe.
PCT/DE1984/000198 1983-09-29 1984-09-27 Procede de traitement thermique de metaux dans des fours a pots et des fours a hotte WO1985001519A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3335283A DE3335283A1 (de) 1983-09-29 1983-09-29 Verfahren zur waermebehandlung von metallen in topf- oder haubenoefen
DEP3335283.6 1983-09-29

Publications (1)

Publication Number Publication Date
WO1985001519A1 true WO1985001519A1 (fr) 1985-04-11

Family

ID=6210397

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1984/000198 WO1985001519A1 (fr) 1983-09-29 1984-09-27 Procede de traitement thermique de metaux dans des fours a pots et des fours a hotte

Country Status (3)

Country Link
EP (1) EP0156888A1 (fr)
DE (1) DE3335283A1 (fr)
WO (1) WO1985001519A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010108204A1 (fr) * 2009-03-25 2010-09-30 Ebner Industrieofenbau Gesellschaft M.B.H. Procédé pour préchauffer un produit à recuire dans une installation de four de recuit à cloche
WO2010089056A3 (fr) * 2009-02-04 2010-11-25 Loi Thermprocess Gmbh Procédé et installation de traitement thermique de tôles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD284903A5 (de) * 1989-06-13 1990-11-28 Veb Bandstahlkombinat "Hermann Matern",Dd Verfahren zur erhoehung der anlagenkapazitaet von haubengluehoefen beim gluehen von festbunden

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2234871A (en) * 1937-04-15 1941-03-11 G W B Electric Furnaces Ltd Furnace
US3184225A (en) * 1963-04-08 1965-05-18 Wilson Eng Co Inc Lee Regenerative furnace
DE2256676A1 (de) * 1972-11-18 1974-06-06 Jurid Werke Gmbh Verfahren zur waermebehandlung von reib-lamellen und vorrichtung zur durchfuehrung des verfahrens
GB1537486A (en) * 1976-03-08 1978-12-29 Apollo Heat Ltd Fluidised beds
GB1567909A (en) * 1977-06-10 1980-05-21 Apollo Heat Ltd Heat treatment apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2234871A (en) * 1937-04-15 1941-03-11 G W B Electric Furnaces Ltd Furnace
US3184225A (en) * 1963-04-08 1965-05-18 Wilson Eng Co Inc Lee Regenerative furnace
DE2256676A1 (de) * 1972-11-18 1974-06-06 Jurid Werke Gmbh Verfahren zur waermebehandlung von reib-lamellen und vorrichtung zur durchfuehrung des verfahrens
GB1537486A (en) * 1976-03-08 1978-12-29 Apollo Heat Ltd Fluidised beds
GB1567909A (en) * 1977-06-10 1980-05-21 Apollo Heat Ltd Heat treatment apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010089056A3 (fr) * 2009-02-04 2010-11-25 Loi Thermprocess Gmbh Procédé et installation de traitement thermique de tôles
WO2010108204A1 (fr) * 2009-03-25 2010-09-30 Ebner Industrieofenbau Gesellschaft M.B.H. Procédé pour préchauffer un produit à recuire dans une installation de four de recuit à cloche
CN102362139A (zh) * 2009-03-25 2012-02-22 艾伯纳工业筑炉有限公司 用于在罩式退火设备中预热退火件的方法
US8790115B2 (en) 2009-03-25 2014-07-29 Ebner Industrieofenbau Gesellschaft M.B.H. Method for preheating annealing products in a hood-type annealing system

Also Published As

Publication number Publication date
EP0156888A1 (fr) 1985-10-09
DE3335283A1 (de) 1985-04-18

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