WO1981003537A1 - Four a longerons mobiles et comprenant des pieces rapportees - Google Patents

Four a longerons mobiles et comprenant des pieces rapportees Download PDF

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Publication number
WO1981003537A1
WO1981003537A1 PCT/DE1981/000084 DE8100084W WO8103537A1 WO 1981003537 A1 WO1981003537 A1 WO 1981003537A1 DE 8100084 W DE8100084 W DE 8100084W WO 8103537 A1 WO8103537 A1 WO 8103537A1
Authority
WO
WIPO (PCT)
Prior art keywords
furnace
elements
heated
girders
heating
Prior art date
Application number
PCT/DE1981/000084
Other languages
German (de)
English (en)
Inventor
R Knaak
H Heuss
Original Assignee
Wistra Thermoprozesstech
R Knaak
H Heuss
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 Wistra Thermoprozesstech, R Knaak, H Heuss filed Critical Wistra Thermoprozesstech
Priority to AU73730/81A priority Critical patent/AU7373081A/en
Publication of WO1981003537A1 publication Critical patent/WO1981003537A1/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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/022—Skids

Definitions

  • the invention relates to a walking beam furnace for heating steel with heating rooms arranged above and below the material to be heated and steel support tubes running in the longitudinal direction of the furnace, which are supported on uprights and are cooled in the flow by a medium.
  • the invention relates to the formation of top sections on these support tubes, with the aid of which the heat flow from the heating material to the cooled support tube is to be minimized or eliminated.
  • the material to be heated is heated in the furnace in such a way that the temperature differences in the material to be heated are as small as possible.
  • the support tubes which are also fired from below and which are fired from below and generally flow-cooled with water in the flow, cause colder strips at the support points above the support tubes because, on the one hand, heat radiation from the lower heating compartments is hindered at these points, and because on the other hand, heat flows through the pipeline from the material to the cooled support tube. It is known that, for this reason, top sections are arranged between the material to be heated and the support pipes, which carry the material to be heated and cause insulation between the material to be heated and the cooled support pipe.
  • top pieces are known both for the under-fired push furnaces and for the under-fired walking beam furnaces.
  • the top sections made of steel and heat-resistant steel alloys are either welded onto the support tube as a continuous strip or in the form of individual pieces, or they are only attached to the support tube set. In the latter case, the top sections, which are divided into individual sections, are secured against shifting and lifting by means of brackets fastened to the support tubes. Loose attachments of this type are often referred to as riders. It has also been proposed to place intermediate layers between these riders and the cooled support tube.
  • the ceramic insulating pieces are surrounded on all sides by a metal protection, which is designed so that. they are only used under pressure.
  • the metallic material prevents the ceramic insulating pieces from being exposed to severe changes in temperature.
  • these insulating pieces have good durability even in tough continuous operation.
  • the frame-like pocket-forming holding elements have the greatest possible dimensional stability due to their design as hollow beams. As a result, the strength of the metallic material is used in the maximum way to absorb the stresses that occur.
  • the sliding pieces which take up the vertical load of the heating material and transfer it to the insulating pieces, are exposed to a certain temperature change when the driving style changes and the temperature of the heating material changes.
  • these 3-part riders are dimensioned so that the heating of the frame-like holding elements due to the radiation of the hot flue gases from the sides is approximately as great as the heat flow from the frame-like holding elements to the cooled support tube.
  • This balance of the heat supply and the heat dissipation on the frame-like holding elements practically results in a complete thermal insulation of the sliding pieces downward (despite the insulation by itself being limited by the ceramic insulating pieces).
  • the sliders practically assume the temperature of the underside of the heating material at this point. This means that no heat flows from the heating material through the sliders. (Of course, the lack of heating of the support points of the 'heating material due to the radiation from the furnace room remains).
  • the object of the invention is to reduce the temperature differences in the heating material which are caused by the support tubes of the walking beam furnaces as far as possible.
  • a walking beam furnace of the type mentioned at the outset that the part of the support tubes which is closer to the input side of the heating material is equipped with one of the known designs of top sections, each of which consists of one or two elements, while the part of the Furnace, which is closer to the outlet of the heating material, is equipped with three-part top sections, each consisting of the following parts:
  • This design according to the invention is based on the idea that the alternate resting of the heating material on one of the two support tube systems of the walking beam furnace can reduce the duration of heat dissipation by heat conduction from the heating material to the support tube by about half, but that the temperature difference is not thereby significantly is reduced.
  • the invention rather recognizes that at temperatures above 1000 ° C, as they exist in the crucial area of the walking beam furnace for heating steel, the heat transfer conditions are not significantly influenced by the heat conduction, but by the 'heat radiation becomes. It is therefore decisive that the heating of the batch of the heat material above the support tube is shielded by the radiation from the furnace space through the support tube even when the heat material is not resting on the support tube. This results in larger temperature differences even with walking beam furnaces. It is therefore also important for walking beam furnaces, particularly in the compensation zone, to keep the heat dissipation by the riders as small as possible.
  • the known three-part tabs with the ceramic insulation layer are only suitable for push furnaces, it has now been found that they can also be used in walking beam furnaces with good results. They achieve a completely sufficient service life and lead to a significant improvement in the heat distribution in the material to be heated. Particularly advantageous results are achieved if, according to the invention, the known one to two-part riders without an insulation layer are provided in the first part of the walking beam furnace, while in the last part a completely uniform heat distribution is achieved by using the three-part top sections. This construction results in a particularly favorable relationship between the investment costs and the quality of the product ultimately produced from the hot material.
  • the drawing shows a preferred embodiment of the three-part attachment piece used according to the invention in the part of the walking beam furnace which is closer to the outlet of the heating material. Show it: 1 such a top piece on a support tube in cross section through the plane II of FIG. 2,
  • the attachment piece consists mainly of the holding element a, the insulating pieces b and the slider c. It is resting. a dashed tube shown d.
  • the holding element a is U-shaped in cross section and is provided with two integrally cast-on holding arms e, which are connected to the supporting tube via tabs f of the supporting tube and bolts g.
  • the illustrated embodiment of the holding element a has three transverse webs h which surround the holding element like a frame.
  • the insulating pieces b are provided, which can consist of a suitable mechanically strong ceramic material. It should be noted in this connection that the insulating pieces can be formed in several parts, so that the top piece consists of more than three components.
  • the term 'three-part attachment piece' includes such constructions in the use chosen here, insofar as the basic three-part structure of holding element, insulating piece and sliding piece is given.
  • the sliding pieces c rest on the insulating pieces b and have downward projections i, the vertical surfaces j of which abut corresponding parts k of the frame-like holding element. You can be secured by bolts 1 on the holding element against lifting.
  • the holding element has retaining cams m which grip around the support tube d or are inserted into corresponding recesses in the support tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

Le four utilise pour le rechauffement d'acier comprend des chambres de combustion disposees au-dessus et au-dessous du produit a rechauffer et des longerons creux en acier (d) disposes longitudinalement par rapport au four, fixes sur des supports et refroidis par un courant de fluide. Un echauffement tres uniforme du produit a echauffer est obtenu par le fait que des pieces rapportees sont fixees sur les longerons: la partie des longerons (d) qui est pres de l'entree des produits a rechauffer, comprend des pieces rapportees a un ou deux elements tandis que la partie proche de la sortie est pourvue de pieces a trois elements de support (a) qui sont poses librement sur les longerons (d) et qui sont subdivises en compartiments par des cloisons transversales (h), des elements isolants (b) en matiere ceramique loges dans les compartiments des elements de support (a), et des elements coulissants metalliques (c), tres resistants a la chaleur, appuyes sur les elements isolants (b) et pourvus d'appendices (i) dont les surfaces verticales (j) sont voisines des surfaces correspondantes (k) des elements de support (a).
PCT/DE1981/000084 1980-06-06 1981-06-03 Four a longerons mobiles et comprenant des pieces rapportees WO1981003537A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU73730/81A AU7373081A (en) 1980-06-25 1981-06-25 Method for metering flour and/or liquid(s) in the kneader during the production of dough and installation for implementing such process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803021275 DE3021275A1 (de) 1980-06-06 1980-06-06 Hubbalkenofen mit aufsatzstuecken
DE3021275 1980-06-06

Publications (1)

Publication Number Publication Date
WO1981003537A1 true WO1981003537A1 (fr) 1981-12-10

Family

ID=6103976

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1981/000084 WO1981003537A1 (fr) 1980-06-06 1981-06-03 Four a longerons mobiles et comprenant des pieces rapportees

Country Status (3)

Country Link
EP (1) EP0052647A1 (fr)
DE (1) DE3021275A1 (fr)
WO (1) WO1981003537A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0141885A1 (fr) * 1983-11-09 1985-05-22 Cameron Iron Works, Inc. Rail de glissement
WO1996034243A1 (fr) * 1995-04-28 1996-10-31 Advanced Materials Enterprise Pty. Ltd. Ensemble a barre mobile pour four
DE3939582C2 (de) * 1989-02-01 2000-05-11 Reining Heisskuehlung Gmbh & C Aufsatzstück für kühlmitteldurchströmte Tragrohre in Wärmeöfen, insbesondere Hubbalkenöfen und Verwendung desselben

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103454C2 (de) * 1991-02-06 1993-10-21 Nassheuer Loi Industrieofenanl Verfahren und Durchlaufofen zum Wärmebehandeln von Werkstückchargen
DE4324421C2 (de) * 1993-07-21 2002-06-06 Loi Thermprocess Gmbh Vorrichtung zum Abstützen von Wärmebehandlungsgut in einem Erwärmungsofen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367641A (en) * 1965-04-06 1968-02-06 Koppers Wistra Ofenbau Gmbh Pusher type furnace
DE2143214B1 (de) * 1971-08-28 1973-06-28 August Thyssen Hütte AG, 4100 Duisburg Harnborn Selbsttragende gleitschiene eines stossofens mit aufgesetzten reitern
DE2218865A1 (de) * 1972-04-19 1973-10-31 Koppers Wistra Ofenbau Gmbh Reiter fuer waermguttraeger in industrieoefen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367641A (en) * 1965-04-06 1968-02-06 Koppers Wistra Ofenbau Gmbh Pusher type furnace
DE2143214B1 (de) * 1971-08-28 1973-06-28 August Thyssen Hütte AG, 4100 Duisburg Harnborn Selbsttragende gleitschiene eines stossofens mit aufgesetzten reitern
DE2218865A1 (de) * 1972-04-19 1973-10-31 Koppers Wistra Ofenbau Gmbh Reiter fuer waermguttraeger in industrieoefen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0141885A1 (fr) * 1983-11-09 1985-05-22 Cameron Iron Works, Inc. Rail de glissement
DE3939582C2 (de) * 1989-02-01 2000-05-11 Reining Heisskuehlung Gmbh & C Aufsatzstück für kühlmitteldurchströmte Tragrohre in Wärmeöfen, insbesondere Hubbalkenöfen und Verwendung desselben
WO1996034243A1 (fr) * 1995-04-28 1996-10-31 Advanced Materials Enterprise Pty. Ltd. Ensemble a barre mobile pour four
EP0839307A4 (fr) * 1995-04-28 1998-05-06
EP0839307A1 (fr) * 1995-04-28 1998-05-06 Advanced Materials Enterprise Pty Ltd Ensemble a barre mobile pour four
US5897310A (en) * 1995-04-28 1999-04-27 Advanced Materials Enterprise Pty Furnace rider bar assembly

Also Published As

Publication number Publication date
EP0052647A1 (fr) 1982-06-02
DE3021275A1 (de) 1982-04-22

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