WO2006111328A1 - Four industriel, en particulier four a sole tournante - Google Patents

Four industriel, en particulier four a sole tournante Download PDF

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Publication number
WO2006111328A1
WO2006111328A1 PCT/EP2006/003440 EP2006003440W WO2006111328A1 WO 2006111328 A1 WO2006111328 A1 WO 2006111328A1 EP 2006003440 W EP2006003440 W EP 2006003440W WO 2006111328 A1 WO2006111328 A1 WO 2006111328A1
Authority
WO
WIPO (PCT)
Prior art keywords
industrial furnace
weir
furnace according
chamber
separation
Prior art date
Application number
PCT/EP2006/003440
Other languages
German (de)
English (en)
Inventor
Winfried RÖDEL
Original Assignee
Loi Thermprocess 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 Loi Thermprocess Gmbh filed Critical Loi Thermprocess Gmbh
Publication of WO2006111328A1 publication Critical patent/WO2006111328A1/fr

Links

Classifications

    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • 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
    • C21D9/0037—Rotary furnaces with vertical axis; Furnaces with rotating floor
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/007—Partitions

Definitions

  • the invention relates to an industrial furnace, in particular a rotary hearth furnace, for heat treatment of Wärmgut.
  • the Wärmgut can be of any kind.
  • sheet metal, strip or wire, wound into coils or coils can be subjected to a suitable heat treatment.
  • the heat treatment can take place under controlled atmosphere in protective or annealing hoods.
  • Electrical steel sheet is heat treated in annealing hoods. This happens in zones of different temperature, in a heating zone and in a downstream cooling zone.
  • the heating zone temperature is up to about 133O 0 C, while the cooling zone temperature is about 800 0 C to 900 0 C.
  • the temperature difference between the heating zone and the cooling zone may well be more than 500 K.
  • the object of the invention is to propose a simple and reliable possibility for separating zones of different temperature, in particular those with high temperature differences.
  • the invention provides an industrial furnace, in particular a rotary hearth furnace, for heat treatment of Wärmgut, with - a heated furnace chamber, which is formed by side walls, a ceiling and a movable hearth and has at least two zones of different temperature, and
  • the dividing weir is of simple construction and can be handled easily. Due to the constant cooling, it withstands high temperatures and large temperature differences.
  • the industrial furnace is characterized by a chamber connected to the oven chamber, in which the dividing ram retracts when extending from the oven chamber.
  • the chamber forms a reliable seal of the furnace chamber in the area of the separation weir.
  • the sealing gas may be combustion air or else exhaust gas, which preferably originates from the zone of lower temperature.
  • the sealing gas can be constantly blown into the separation chamber. However, if the dividing weir in its closed position seals the chamber completely against the furnace chamber, the barrier gas will only be blown into the chamber when the dividing weir is open and during the opening and closing movements. The latter happens with a pressure that is significantly above the pressure of the furnace chamber.
  • the separation chamber is preferably thermally insulated.
  • the separation chamber it is possible to arrange the separation chamber on a side wall of the furnace chamber. It is more advantageous, however, to put them on the ceiling of the oven room.
  • the dividing weir can then be lowered in a simple manner in the oven room and pull out of it.
  • the side walls of the furnace chamber have grooves in which the separation weir is performed, the grooves form labyrinth seals together with the separation weir.
  • the labyrinth seals ensure a reliable separation of zones of different temperatures.
  • the dividing weir is used, the stove hearth can carry a sealing bar on which the dividing weir rests in its lowered position. Otherwise, the dividing weir is controlled by Wegendbe bayn. It can only be lowered when the stove has come to a standstill, and the stove can only be moved when the dividing weir is raised. Corresponding sensors generate the required signals.
  • a circulating water cup is arranged at the bottom of the Trenn Wegkker, in which immersed the defense in its lowered position with a circumferential dipping strip.
  • the separating weir chamber is hermetically separated from the furnace chamber.
  • the water cup is constantly supplied with fresh water and has a corresponding overflow.
  • the separation weir hangs on chains that pass through openings in the separation chamber ceiling.
  • a chain drive has proven to be particularly suitable. It is proposed that the separation unit carries sealing elements which seal the chain openings when the separation defense is raised. In contrast to the lines that supply the separating system's coolant system, chains can not be sealed through the separating chamber ceiling. In order to still be able to build up a high sealing gas pressure in the separation chamber without losses, the chain openings are sealed, as soon as they are in their raised position, by the separation unit itself. It is suggested that the
  • Sealing elements are cone-shaped and engage in correspondingly shaped mouths of the chain openings.
  • the drive of the chain suspension can be done electromechanically. Under certain circumstances, it is more advantageous to actuate the chains of the separation weir via a common hydraulic or pneumatic piston working machine, the latter being able to be arranged at any position, but preferably on a side wall of the furnace. A corresponding deflection of the chains is easily possible.
  • the coolant lines of the separation weir have at least one U-shaped wiring harness, which has a in its middle opening line is connected to the coolant source, with its two legs open into a common outlet conduit. The two legs of the U-shaped wiring harness are of equal length and are therefore flowed through evenly from the middle of the wiring harness.
  • any refractory materials are suitable for the separation unit.
  • Lightweight concrete has proved to be particularly advantageous. It is characterized by good gastightness and at the same time by low wear despite high air velocities; thus there is no danger of wastes. Even when in contact with the guide grooves of the outer walls, refractory lightweight concrete proves to be wear-resistant. Moreover, it does not represent a health hazard because no respirable fiber particles are present.
  • Figure 1 shows a radial section through a rotary hearth furnace
  • Figure 2 shows a section of a section perpendicular to the plane of Figure 1.
  • the rotary hearth furnace has a heatable furnace chamber 1, which is formed by side walls 2, a ceiling 3 and a movable hearth 4.
  • the hearth 4 carries a plurality of annealing hoods 5.
  • separating weir 6 hangs on chains 7 and is raised and lowered by a hydraulic piston working machine 8.
  • Figure 1 shows the separating weir 6 in the raised position. It is recorded for the most part by a separation chamber 9, which is mounted on top of the ceiling 3 of the rotary hearth is. It is thermally insulated and can be charged with sealing air.
  • the separating weir 6 runs in grooves 10 which are formed in the side walls of the rotary hearth. In the raised position, the lower portion of the separation weir 6 is still still in engagement with the grooves 10.
  • the blocking air is blown into the separating weirs 9, with a pressure which is a multiple of the pressure prevailing in the furnace chamber 1, in the present case 10 times.
  • a pressure which is a multiple of the pressure prevailing in the furnace chamber 1, in the present case 10 times.
  • FIG. 2 shows that a circulating water cup 11 is provided at the bottom of the separating weir chamber 9, into which the separating weir 6 plunges with a circumferential immersion strip 12 and which hermetically seals the weeding combs 9 against the furnace chamber 1.
  • the system of labyrinth seals then has the task to complete the two zones of different temperature against each other.
  • the dividing weir 6 rests on a sealing bar 13, which is carried by the hearth 4 of the rotary hearth furnace.
  • the separating weir 6 carries conical sealing elements 14 which, in the raised position, close the openings for the passage of the chains 7.
  • the mouths of these openings are correspondingly conical.
  • the required sealing air pressure can be built up with little loss.
  • the separation weir 6 is penetrated by two U-shaped strands of wire 15, the over in their Center opening lines 16 are connected to the coolant source.
  • the two legs 17 of each strand of wire 15 each open into a common outlet line 18. In the present case, therefore, two outlet lines 18 are present. These can be easily connected.
  • the separation 6 is made of refractory lightweight concrete, which is resistant to washout at high air velocities and also wear in the grooves 10 of the side walls 2 of the rotary hearth furnace works. Since the refractory lightweight concrete is free from respirable fibers, it also means no health risk. Above all, he has a good gas tightness.
  • the strands of wire 15 can be insulated with refractory lightweight concrete.
  • fiber plates may be arranged.
  • the system of coolant lines that enforce the separation weir can be designed differently.
  • the separation weir chamber can also be arranged laterally on the furnace, although the arrangement on the furnace roof represents the constructively far more favorable solution.
  • an electromechanical drive is equally conceivable.
  • the chain suspension of the separation weir is an optimal solution.
  • With appropriate space but also a suspension of tie rods is conceivable, which are guided in sealing collars, so that therefore can be omitted from the separation of the worn sealing elements.
  • the design of these sealing elements is otherwise arbitrary, although the cone shape used here produces a certain effect of self-centering. According to the present embodiment, sealing air is blown into the separation weir chamber. Instead, it is also possible to work with exhaust gas.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Tunnel Furnaces (AREA)

Abstract

La présente invention concerne un four à sole tournante qui sert à réaliser un traitement thermique de matière à chauffer, comprenant une enceinte de four (1) qui peut être chauffée et présente deux zones de température différente. Entre ces zones se trouve un élément de séparation (6) qui est parcouru par des conduites d'agent de refroidissement (15 à 17) qui sont raccordées à une source d'agent de refroidissement. L'élément de séparation (6) est accroché à des chaînes (7), et est élevé à l'intérieur d'une chambre à élément de séparation (9) à laquelle est appliqué de l'air de retenue lorsque l'élément de séparation est ouvert, s'ouvre ou se ferme. Lorsque l'élément de séparation (6) est fermé, un rebord d'immersion périphérique dudit élément, s'encliquette dans une fermeture hydraulique périphérique de sorte que la chambre à élément de séparation (9) peut être rendue étanche vis-à-vis de l'enceinte de four (1).
PCT/EP2006/003440 2005-04-19 2006-04-13 Four industriel, en particulier four a sole tournante WO2006111328A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005018181 2005-04-19
DE102005018181.3 2005-04-19

Publications (1)

Publication Number Publication Date
WO2006111328A1 true WO2006111328A1 (fr) 2006-10-26

Family

ID=36687186

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/003440 WO2006111328A1 (fr) 2005-04-19 2006-04-13 Four industriel, en particulier four a sole tournante

Country Status (1)

Country Link
WO (1) WO2006111328A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007137547A1 (fr) * 2006-05-29 2007-12-06 Pink Gmbh Vakuumtechnik Procédé et dispositif de traitement thermique, en particulier une jonction par soudure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2053212A1 (de) * 1969-11-03 1972-02-03 Btu Eng Corp Schranke für Muffeln
GB2189014A (en) * 1986-04-09 1987-10-14 Tfw Dixon & Son Ltd Segmented ceramic furnace baffle
EP1475446A1 (fr) * 2002-02-12 2004-11-10 Dowa Mining Co., Ltd. Four de traitement thermique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2053212A1 (de) * 1969-11-03 1972-02-03 Btu Eng Corp Schranke für Muffeln
GB2189014A (en) * 1986-04-09 1987-10-14 Tfw Dixon & Son Ltd Segmented ceramic furnace baffle
EP1475446A1 (fr) * 2002-02-12 2004-11-10 Dowa Mining Co., Ltd. Four de traitement thermique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007137547A1 (fr) * 2006-05-29 2007-12-06 Pink Gmbh Vakuumtechnik Procédé et dispositif de traitement thermique, en particulier une jonction par soudure
US7878386B2 (en) 2006-05-29 2011-02-01 Pink Gmbh Thermosysteme Method and device for heat treatment, especially connection by soldering

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