EP0302301B1 - Voie de tube refroidie pour des fours industriels de réchauffage - Google Patents

Voie de tube refroidie pour des fours industriels de réchauffage Download PDF

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Publication number
EP0302301B1
EP0302301B1 EP88111648A EP88111648A EP0302301B1 EP 0302301 B1 EP0302301 B1 EP 0302301B1 EP 88111648 A EP88111648 A EP 88111648A EP 88111648 A EP88111648 A EP 88111648A EP 0302301 B1 EP0302301 B1 EP 0302301B1
Authority
EP
European Patent Office
Prior art keywords
offset
sections
length
tubular
support
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.)
Expired - Lifetime
Application number
EP88111648A
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German (de)
English (en)
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EP0302301A1 (fr
Inventor
Helmut Dipl.-Ing. Heuss
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
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Ruhrgas AG
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Filing date
Publication date
Application filed by Ruhrgas AG filed Critical Ruhrgas AG
Publication of EP0302301A1 publication Critical patent/EP0302301A1/fr
Application granted granted Critical
Publication of EP0302301B1 publication Critical patent/EP0302301B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F27B9/20—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 substantially straight path tunnel furnace
    • F27B9/201—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 substantially straight path tunnel furnace walking beam furnace
    • 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
    • F27B9/20—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 substantially straight path tunnel furnace
    • F27B9/22—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 substantially straight path tunnel furnace on rails, e.g. under the action of scrapers or pushers

Definitions

  • the invention relates to a cooled pipe string for industrial heating furnaces with individual support tubes which extend in the longitudinal direction of the furnace from the inlet towards the outlet and have a plurality of lateral dislocation jumps, the support tube sections formed between the dislocation jumps being offset with respect to one another and the length of each in Direction of flow of the heat material downstream offset support tube section is shorter than that of the previous section.
  • US-A-3 212 763 describes a burner-heated heating oven with air-cooled support tubes of the type mentioned above.
  • the air heated in the support tubes is to be used as combustion air for the burners.
  • the support tubes are divided into several sections in the direction of flow. Each section of the supporting tube is connected to transverse air lines by means of vertical lines.
  • the entire support tube system is structurally very complex and unsuitable for heating furnaces which are operated at high temperatures for heating steel to the rolling temperature.
  • JP-A-5811725 describes a walking beam furnace, the support rails of which have a plurality of "zigzag" -shaped displacements.
  • parallel sections with a lateral distance from one another are procured in order to enable the staggered arrangement of burners in the lower heating zone.
  • cooling shadows are only half removed or new half cooling shadows are created.
  • the invention is therefore based on the object to form a cooled pipe string of the type mentioned so that it is suitable for higher temperatures with a simple design and that the cooling shadow effects caused by the cooled support tubes are reduced and virtually completely degraded in the compensation zone can.
  • the support tubes are formed continuously from the inlet to the outlet of the furnace and are connected to a water cooling system, and that the support tubes are further provided, at least in part, with attachment pieces for the heating material passing through, with the offset jumps in each case across the width go out of the associated support tube.
  • top sections are known per se, but in connection with uncooled support tubes (FR-A-1 432 434).
  • the offset support tube sections in the invention are at least in part inevitably in the heating zone, as soon as the material to be heated reaches the first offset support tube section, the area of the previously offset by the non-offset support tube Heat goods with the lower temperature are already free during heating for heating to a higher temperature level in the places that were not yet in the supporting tube shadow. Now that the support tube, possibly together with the top sections, comes into contact with its hotter points when the heat material is transported straight, an almost temperature compensation will occur soon.
  • the second offset is now provided in this area. This further reduces the temperature differences.
  • the last-mentioned arrangement will be the rule.
  • the offset support tube section located furthest downstream in the flow direction of the heating material ends at the outlet of the heating furnace.
  • the above-mentioned support tube section can end at the fixed hearth. This can therefore be built with a full, undivided support surface, which minimizes wear from the slabs.
  • the invention can also be implemented in walking beam furnaces.
  • the walking beams expediently have the same dislocations as the support tubes and are also preferably water-cooled.
  • the offset walking beams have the same good effects as the offset support tubes, even if they come into contact with the gradually rollable slabs for a much shorter time.
  • the support tubes, together with the walking beams may have three staggered length sections, of which two sections downstream in the direction of flow are approximately 1/3 shorter in succession at a vertical heat material thickness of approx. 250 mm than the previous sections.
  • FIGS. 1 and 2 show two longitudinal sectional views through a pusher furnace 1 that are perpendicular to one another.
  • a pipe string 2 with individual, parallel water-cooled support pipes 3 is provided, which are arranged on vertical support pipes 4.
  • the heating material 6 (slabs or the like) is moved in a direction of passage 7 from an inlet 8 along a horizontal sliding surface through the pusher furnace 1 to its outlet 9.
  • the heating material 6 first passes through a preheating zone A arranged behind the inlet, then a heating zone B, in which the heating material is brought to the treatment temperature, and finally a compensation zone C, which ends at the outlet 9 of the furnace 1.
  • the support tubes 3 extend continuously from the inlet 8 through the preheating zone A and the heating zone B and end at the equalization zone C. Top pieces 10 rest on the support tubes 3.
  • the equalization zone C in the embodiment according to FIGS. 1 and 2 is in one Solid hearth 14 formed, the bottom surface is completely covered with ceramic plates. The sliding surface of the heating material 6 formed by the surfaces of the top pieces 10 merges practically seamlessly into the level of the full plating of the fixed cooker 14.
  • the support tubes 3 in the preheating zone A run in a straight line and parallel to the direction of impact 7.
  • pronounced cooling shadows in the heat material 6 would lie directly above the support tubes 3 and the top pieces 10 placed on them form if the straight course of the support tubes 3 would also continue over the heating zone B of the pusher furnace 1.
  • a first horizontal, lateral offset 11 is provided approximately at the boundary between preheating zone A and heating zone B.
  • the extent of the lateral offset 11 is preferably at least as large as the widths of the support tube 3.
  • the support tubes 3 run around the lateral offset 11, shifted parallel to their course in the preheating zone A. that is, at a second offset point 12, an opposing lateral offset is provided. Behind the offset 12, the support tubes 3 with their attachments 10 are aligned again with the support tube profile in the preheating zone A.
  • a third offset point 13 is provided, at which the support tubes 3 are displaced again and brought into alignment with the support tube sections L1 .
  • the successively offset support tube sections L1, L2 and L3 are of different lengths.
  • the subsequent length section L2 or L3 in the direction of passage 7 are each shortened in the preferred embodiment by approximately 1/3 of the length of the immediately preceding offset length section L1 or L2.
  • the reference length of the first offset length section L 1 in the direction of passage 7 is mediated.
  • a frequently occurring thickness of about 250 mm in practice which are to be heated to the rolling temperature in the furnace 1 have proven particularly expedient for the pipe string sections L 1, L 2 and L 3 lengths of 4500 mm, 3000 mm and 2000 mm.
  • a walking beam furnace 21 is shown schematically in FIGS. 3 and 4.
  • the design of the support tubes 3, the support tubes 4, the top pieces 10 and furnace inlet 8 and outlet 9 can correspond to that of the previously described pusher furnace 1, so that corresponding components of the walking beam furnace are designated by the same reference numerals as in the pusher furnace 1.
  • the cooled pipe string 22 has, in addition to the support pipes running parallel to the direction of passage 7, 3 walking beams 23, which are preferably also water-cooled.
  • the drive mechanism moving the walking beams 23 is known and is not shown in FIGS. 3 and 4. As can be seen in Fig.
  • both the support tubes 3 and the cooled walking beam 23 have pairs of common offset points 11, 12 and 13, which results in laterally offset longitudinal sections L1, L2 and L3.
  • the function of the lateral displacements 11, 12, 13 corresponds to that in the previously described pusher furnace, namely the avoidance of a pronounced formation of cooling shadows at the locations of the heating material 6 which rest on the cooled support tubes or walking beams over longer treatment times in the furnace 21.
  • the offset longitudinal sections L2 and L3 are therefore predominantly arranged in the compensation zone C adjacent to the furnace outlet 9.
  • the heating zone B is the first offset length section L 1 in the direction of passage 7 and the beginning of the subsequent second length section L 2.
  • the aspect ratios, ie the shortening of the lengths L2 and L3 compared to each preceding length sections L1 and L2 are provided similar to the embodiment described above.
  • Three offset length sections with decreasing section length in the direction of passage 7 form a preferred exemplary embodiment of the invention. If necessary, two offset lengths L 1 and L 2 without the third length L 3 are sufficient to prevent the formation of a cooling shadow. On the other hand, it is also possible within the scope of the inventive concept to use more than three offset length sections with decreasing length towards the outlet 9.
  • the number of support tubes and / or walking beams which are preferably arranged parallel to one another and likewise preferably offset at the same points (11, 12 or 13), is not essential for the invention; what is essential is the arrangement and sequence as well as the relative length of the offset length sections on a support tube and possibly the associated walking beam arrangement.
  • the offset support tube sections L1, L2 and L3 are at least partially arranged in the heating zone B in the invention.
  • the temperature compensation while preventing the formation of a cooling shadow on the material to be heated therefore already takes place in heating zone B during the heating period and is not limited to compensation zone C.
  • the staggering of the different lengths L2 and L3 ensures a particularly favorable cooling shadow removal and an optimal temperature compensation within the heat material 6 during the compensation treatment in zone C.

Landscapes

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

Claims (2)

  1. Système de tubes (2, 22) pour fours industriels de réchauffage (1, 21), équipé de tubes-supports séparés (3), s'étendant dans le sens de la longueur du four depuis l'entrée (8) jusqu'à la sortie (9) de la charge et possédant un nombre de parties latérales en retrait (11 - 13), les tronçons (L₁ - L₃) entre les parties en retrait (11 - 13) étant décalés les uns par rapport aux autres et la longueur de chacun des tronçons (L₂ - L₃) décalés étant, dans le sens du transport (7) de la charge (6), plus courte que celle du tronçon amont (L₁ - L₂), caractérisé par le fait que les tubes-supports (3) forment un système continu depuis l'entrée (8) jusqu'à la sortie (9) du four (1, 21) et qu'ils sont raccordés à une installation de refroidissement à l'eau, qu'au moins certains des tubes-supports (3) sont, de plus, munis de chevaliers (10) de support de la charge (6) épousant la forme des parties en retrait, ces dernières (11 - 13) dépassant d'ailleurs la largeur du tube-support correspondant.
  2. Système de tubes refroidis à l'eau selon la revendication 1, caractérisé par le fait que les tubes-supports (3) consistent de trois tronçons longitudinaux (L₁, L₂, L₃) décalés les uns par rapport aux autres et que pour une épaisseur verticale de la charge d'environ 250 mm les deux tronçons (L₂, L₃) aval dans le sens du transport (7) sont chacun d'environ un tiers plus courts que les tronçons amont.
EP88111648A 1987-08-01 1988-07-20 Voie de tube refroidie pour des fours industriels de réchauffage Expired - Lifetime EP0302301B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3725607 1987-08-01
DE3725607A DE3725607A1 (de) 1987-08-01 1987-08-01 Gekuehlter rohrstrang fuer industrie-erwaermungsoefen

Publications (2)

Publication Number Publication Date
EP0302301A1 EP0302301A1 (fr) 1989-02-08
EP0302301B1 true EP0302301B1 (fr) 1993-05-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111648A Expired - Lifetime EP0302301B1 (fr) 1987-08-01 1988-07-20 Voie de tube refroidie pour des fours industriels de réchauffage

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US (1) US4886450A (fr)
EP (1) EP0302301B1 (fr)
DE (2) DE3725607A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5232359A (en) * 1991-07-26 1993-08-03 Campbell Frank Jun Device for increasing the thermal radiation heat transfer on an object in a furnace
US5405264A (en) * 1992-04-23 1995-04-11 Loi Essen Industrieofenanlagen Gmbh Device for carrying a charge in a furnace
US5374186A (en) * 1994-01-19 1994-12-20 Italimpianti Of America, Inc. Roll system for roller hearth furnaces for thin slabs
US6299433B1 (en) 1999-11-05 2001-10-09 Gas Research Institute Burner control
US7241135B2 (en) 2004-11-18 2007-07-10 Honeywell International Inc. Feedback control for modulating gas burner
CN103334002A (zh) * 2013-07-17 2013-10-02 上海诚达工业炉有限公司 连续加热炉进钢口的横梁机构

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1895072A (en) * 1927-02-17 1933-01-24 Ray M Fenton Continuous furnace for metallurgical purposes
US1927634A (en) * 1929-02-19 1933-09-19 Frank A Fahrenwald Furnace
US2023126A (en) * 1934-06-09 1935-12-03 Frank A Fahrenwald Subdivided roller bottom for sheet normalizing furnaces
GB525204A (en) * 1939-02-15 1940-08-23 Stein & Atkinson Ltd Improvements in furnaces, particularly for the heat treatment of metals
US3100811A (en) * 1960-05-31 1963-08-13 Frederick S Bloom Metal heating furnace
DE1199301B (de) * 1961-03-24 1965-08-26 Didier Werke Ag Waermofen fuer metallisches Gut
US3179395A (en) * 1962-05-09 1965-04-20 Allegheny Ludlum Steel Slab heating furnaces
US3212763A (en) * 1964-03-05 1965-10-19 United States Steel Corp Reheating furnace
FR1432434A (fr) * 1965-05-10 1966-03-18 Armco Steel Corp Procédé et four pour le chauffage de pièces métalliques
DE2039508C3 (de) * 1970-08-08 1973-12-06 Huettenwerk Oberhausen Ag, 4200 Oberhausen Stoßofen
DE2039507C3 (de) * 1970-08-08 1973-12-06 Huettenwerk Oberhausen Ag, 4200 Oberhausen Aufsatzstucke für wassei gekühlte Tragrohre eines Stoßofens
DE2123729A1 (en) * 1971-05-13 1972-11-16 Karrena-Feuerungsbau GmbH, 4000 Düsseldorf-Rath Preheat furnace - with change in support positions ensuring even prod temp
DE3325733A1 (de) * 1983-07-16 1985-01-24 Bloom Engineering (Europa) GmbH, 4000 Düsseldorf Waermofen
DE3440126C2 (de) * 1984-11-02 1993-11-18 Italimpianti Deutschland Gmbh Hubbalkenofen

Also Published As

Publication number Publication date
DE3725607A1 (de) 1989-02-09
EP0302301A1 (fr) 1989-02-08
DE3880916D1 (de) 1993-06-17
US4886450A (en) 1989-12-12

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