US3726514A - Arrangement at walking beam furnace - Google Patents

Arrangement at walking beam furnace Download PDF

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Publication number
US3726514A
US3726514A US00161182A US3726514DA US3726514A US 3726514 A US3726514 A US 3726514A US 00161182 A US00161182 A US 00161182A US 3726514D A US3726514D A US 3726514DA US 3726514 A US3726514 A US 3726514A
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United States
Prior art keywords
walking beam
ridges
furrows
furnace
charge
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
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US00161182A
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English (en)
Inventor
E Fagergren
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TABOUGNAR AB
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TABOUGNAR AB
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Publication date
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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
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/3005—Details, accessories or equipment specially adapted for furnaces of these types arrangements for circulating gases
    • F27B9/3011—Details, accessories or equipment specially adapted for furnaces of these types arrangements for circulating gases arrangements for circulating gases transversally
    • 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
    • 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 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
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • 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

Definitions

  • the ridges 58 'Field of Search ..263/6 A, 6 R are Prcwided with transverse chamlels mnecting the longitudinal areas for the walking beams with the 56 R f spaces outside the ridges, and these spaces are sup- 1 e erences CI plied with heat for introduction into the areas above UNITED STATES PATENTS the walking beams but below the charge.
  • This invention relates to a walking beam furnace for heating the charge being advanced through the furnace by walking beams located in longitudinal openings in the hearth.
  • the hearth is provided with longitudinal supporting ridges for the charge on both sides of the openings, thereby forming a longitudinal area above the walking beams operating in said area.
  • the invention has as its object to improve the temperature uniformity for the material being heated in the furnace and to compensate for the heat losses occurring through the furnace bottom and especially at the gaps at the longitudinal areas for the walking beams.
  • the present invention eliminates to a very large extent the formation of these cooling rings, because the invention provides a possibility of supplying heat to the areas above the walking beams which otherwise do not receive any heat from heating the charge.
  • the heat can be controlled with respect to its amount, transport speed and direction, and a uniform heating of the lower surfaces of the charge is obtained.
  • the heat supplied can according to the invention be produced in different ways, for example by the arrangement of auxiliary burners in suitable places.
  • the burners can be controlled in a suitable way, for example by the supply of excess air so that the burner or the flames of the burners are tempered as desired.
  • the invention furthermore, renders it possible to make use of the recirculation of waste gases or excess gas in the furnace, and the heat content of these gases is utilized for an additional heat supply to the lower surface of the charge.
  • the arrangement according to the invention has been given the characterizing feature that the supporting ridges are provided .with transverse channels connecting the longitudinal areas for the walking beams with the spaces outside the ridges, which spaces are supplied with heat for introduction into the areas above the walking beams but below the charge.
  • FIG. 1 shows cross-section cross-section through a walking beam furnace, the left-hand portion of the Figure showing one, and the right-hand portion showing a second embodiment.
  • FIG. 2 shows a part of a walking beam furnace in a plane section, disclosing the section according to FIG. 1 having been taken along the lines A--A.
  • FIG. 3 shows half a cross-section of a walking beam furnace constructed according to a third embodiments
  • FIG. 4 shows a plane view of the walking beam furnace according to the lastmentioned embodiment, disclosing the section according to FIG. 3 having been taken along the line B-B in FIG. 4.
  • the walking beam furnace comprises a stationary hearth l, which is provided with four supporting ridges 2, on which the charge rests when the walking beams are in their non-operative lowered positions.
  • the walking beams 4 operate in a usual way upwards and reciprocate in longitudinal grooves 5 taken out in the hearth and located between two supporting ridges 2.
  • the heat losses occur downwards toward the walking beams and within the gaps formed between the walking beams and the hearth. Therefore, the heat conditions above the walking beams and toward the lower surface of the charge differ from those in other areas above the hearth in the furnace.
  • FIG. 2 extend obliquely inwardly toward the walking beams and in the direction of transport of the charge through the furnace.
  • the arrows in the left-hand portion of FIG. 2 illustrate the way of the heat from the furrows'6 through the channels 9 into the area 5 above the walking beams.
  • the channels 9 are so arranged with respect to their cross-sectional opening and division that the desired heat distribution is effected along the entire area 5 above the walking beams.
  • the heat distribution is promoted by the obliqueness of the channels 9 which, however, also is suitable and perhaps necessary in the case of a charge having a small width, which charge otherwise upon lowering of the walking beams may fall down through the channels 9 in the supporting ridges.
  • Auxiliary burners, in addition to those in the end walls, may be provided where required, for example in the places 10 marked in FIG. 2 and in the left-hand portion of FIG. 1.
  • FIGS. 1 and 2 show a second embodiment at which for corresponding details the same reference numerals as in the left-hand portions of the Figures have been used.
  • the differencecompared with the first embodiment is that the furrows 6 on the outside of the supporting ridges 2 are open upwardly, but in other respects have the same form of channel connection to the area 5 above the walking beam 4.
  • Heat is supplied to the furrows 6 by recirculation of waste gases from the furnace or of gases being within the furnace. By a suitable pressure relation the hot gases can be self-circulated to the furrows 6 and through the channels 9 be introduced into the areas.
  • FIGS. 3 and 4 a third embodiment is shown by way of only the right-hand portion or right-hand half of a walking beam furnace.
  • This embodiment corresponds in all essential parts to the design shown in the left-hand portion of FIGS. 1 and 2, i.e. the first embodiment, and also the reference numerals are the same.
  • the channels, which connect the furrows 6 with the area 5 in the third embodiment are tubular channels 11 extending through the supporting ridges 2. Said tubular channels extend obliquely upwards from the furrows 6 and also obliquely forward in the direction of motion of the charge.
  • the furrows are covered by covers 7, and heat is supplied to the furrows by extra burners 8 and 10.
  • the arrows in FIG. 4 mark the way of the heat transport into the area 5.
  • the channels may be designed in different ways and also be directed perpendicularly to the walking beams or obliquely rearwards, depending on how the heat is supplied to the furrows and on the prevailing pressure conditions.
  • the advantage of using tubular channels 11 through the supporting ridges is that a charge of small width safely can be supported by the supporting ridges.
  • Heat may also be supplied to the furrows 6 in a way different from that now described and, for example, ramps of burners may be provided in the furrows 6.
  • a walking beam furnace for heating a charge whilst being advanced in feeding direction through the furnace by a walking beam disposed in a longitudinal opening in a stationary hearth of the furnace which hearth is provided with longitudinal supporting ridges for the charge in both sides of said opening thereby forming a longitudinal area above said walking beam
  • the improved construction which further comprises heating ducts longitudinally disposed outside of and parallel to said supporting ridges; a heating means operatively associated with each of said heating ducts and adapted to supply heating gas thereto; and a series of transverse channels connecting said heating ducts with said longitudinal area for supplying heat into said area above said walking beam but below such charge.
  • a walking beam furnace characterized in that said channels are open upwardly through the ridges and directed obliquely to the feeding direction.
  • a walking beam furnace according to claim 1 characterized in that the channels have tubular shape.
  • a walking beam furnace characterized in that the heating ducts outside the ridges are covered furrows at the outsides of the supporting ridges, and that the channels extend from these furrows inwardly towards the areas for the walking beams, and that heat is supplied to the furrows by burners.
  • a walking beam furnace characterized in that the heating ducts outside the ridges are open furrows, and that heat is supplied by recirculation of excess gases in or from the furnace.
  • a walkingbeam furnace according to claim 4 characterized in that the covered furrows are provided with ramps of burners.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
US00161182A 1970-11-04 1971-07-09 Arrangement at walking beam furnace Expired - Lifetime US3726514A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE14889/70A SE338580B (enrdf_load_stackoverflow) 1970-11-04 1970-11-04

Publications (1)

Publication Number Publication Date
US3726514A true US3726514A (en) 1973-04-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00161182A Expired - Lifetime US3726514A (en) 1970-11-04 1971-07-09 Arrangement at walking beam furnace

Country Status (5)

Country Link
US (1) US3726514A (enrdf_load_stackoverflow)
DE (1) DE2134812C3 (enrdf_load_stackoverflow)
FR (1) FR2112899A5 (enrdf_load_stackoverflow)
GB (1) GB1327286A (enrdf_load_stackoverflow)
SE (1) SE338580B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556385A (en) * 1983-03-11 1985-12-03 Stein Heurtey S.A. Furnace with refractory beams

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3744271A1 (de) * 1987-12-24 1989-07-13 Hanf Carl Elino Ind Ofenbau Ofen zur durchfuehrung einer waermebehandlung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1400367A (en) * 1919-09-10 1921-12-13 Harry P Mccann Furnace and method of conveying materials therethrough
US1747067A (en) * 1926-10-06 1930-02-11 Major E Gates Heat-treating furnace
US1792074A (en) * 1928-10-03 1931-02-10 Surface Comb Co Inc Heat-treating furnace
US2039445A (en) * 1935-04-20 1936-05-05 Onondaga Pottery Company Tunnel kiln

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1400367A (en) * 1919-09-10 1921-12-13 Harry P Mccann Furnace and method of conveying materials therethrough
US1747067A (en) * 1926-10-06 1930-02-11 Major E Gates Heat-treating furnace
US1792074A (en) * 1928-10-03 1931-02-10 Surface Comb Co Inc Heat-treating furnace
US2039445A (en) * 1935-04-20 1936-05-05 Onondaga Pottery Company Tunnel kiln

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556385A (en) * 1983-03-11 1985-12-03 Stein Heurtey S.A. Furnace with refractory beams

Also Published As

Publication number Publication date
DE2134812C3 (de) 1975-04-10
DE2134812B2 (de) 1974-08-15
DE2134812A1 (de) 1972-05-10
FR2112899A5 (enrdf_load_stackoverflow) 1972-06-23
GB1327286A (en) 1973-08-22
SE338580B (enrdf_load_stackoverflow) 1971-09-13

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