US3721518A - Method for sealing and cooling the component parts associated with the moving and stationary members of walking beam furnaces - Google Patents

Method for sealing and cooling the component parts associated with the moving and stationary members of walking beam furnaces Download PDF

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Publication number
US3721518A
US3721518A US00121850A US3721518DA US3721518A US 3721518 A US3721518 A US 3721518A US 00121850 A US00121850 A US 00121850A US 3721518D A US3721518D A US 3721518DA US 3721518 A US3721518 A US 3721518A
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United States
Prior art keywords
furnace
air
slot
cooling
sealing
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Expired - Lifetime
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US00121850A
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English (en)
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C Wilt
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Salem Corp
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Salem Corp
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    • 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

Definitions

  • My invention relates to a method for simultaneously sealing and cooling the furnace members and, in particular, to sealing and cooling the moving and associated stationary members in walking beam furnaces.
  • Walking beam furnaces are designed to move a product, usually a billet, slab, ingot or plate through a furnace while it is being heated and providing a uniformity of temperature to all parts thereof uncommon to water cooled skid furnaces. Examples of these furnaces are found in U.S. Pat. Nos. 1,272,918; 1,973,934; and 3,398,939.
  • One embodiment of my invention consists of a walk ing beam type furnace wherein the hearth is divided longitudinally into alternate sections of stationary and moving hearths, i.e., a number of moving islands or beams disposed between stationary members which are designed to move upwardly, forwardly, downwardly, and rearwardly during one complete cycle.
  • the first two movements move the product progressively through the furnace while the last two are designed to reposition the island or beam for the next product movement.
  • the islands may be separated by an elongated slot from the stationary portion of the hearth or there may be elliptical openings through which movable supports raise and lower the work supports.
  • the moving parts of the beam must be unrestricted in their movement while sealed to a furnace chamber in such a manner that the surface quality, temperature, and temperature uniformity of the work piece are unaffected by the sealing device. Further the seal must be reliable, economical and easily maintained.
  • the most common seal is the water seal which, generally, comprises a water trough below the slot extending the length of the furnace in which is emersed an elongated blade connected to the movable beam.
  • the water seal is extremely effective in preventing hot furnace gases or furnace atmosphere from escaping through the slot.
  • the water in the trough will cool the trough support members and sealing members but the amount of cooling is limited by the ability of the members to conduct the heat and the length of the conductive paths involved.
  • the present invention overcomes or eliminates many of these problems and at the same time reduces the cost of both operation and maintenance of the seal and cooling system.
  • My method of sealing and cooling the slot and members respectively utilizes low pressure air. 1 have found a method for simultaneously using a plurality of jets of air directed into the slot to create a stagnation plane for sealing a furnace to the outside as well as cooling the structural support members located within the slot. Not only have I found that both an effective seal and cooling method can be obtained with air but 1 have unexpectedly found that the work piece in the furnace has a greater top to bottom temperature uniformity in the region of the slot than as common with water type seals.
  • Air has long been known to be effective as a seal as well as carrying out other associated functions in indus trial furnaces; see, for example U.S. Pat. Nos. 713,288; 1,911,394; 2,269,645; 2,819,889; 3,270,655 and 3,397,874. 1 have found a method for sealing a moving island and a stationary member in a walking beam furnace with an air stream that overcomes the many problems associated with water and mechanical seals without sacrificing work surface quality, temperature, and temperature uniformity within the furnace.
  • a normal impingement against the beam members will split the individual air streams in such a manner that there is air flowing both up the slot and down the slot; that is, to and from the furnace.
  • l regulate the velocity of the air emitting from the holes so that after the air stream divides the kinetic energy of the stream flowing toward the furnace is slightly more than is required to stagnate and form a stagnation plane with the gasses attempting to flow from the furnace.
  • a turbulence exists at the stagnation plane which causes minor intermingling of the furnace gas with the air from the seal.
  • the seal air rebounds from the stagnation plane and flows downward and mixes with the other portion of the divided air jet.
  • the furnace gases also rebound from the stagnation plane and re-entered the furnace carrying only a minor portion of the seal air. Since the furnace gases are normally higher in temperature than the work being heated and there is little dilution and lowering of the gas temperature by virtue of mixing with the seal air, the rebounding gases are still hotter than the work being heated and the turbulence created tends to produce uniformity of work temperature in the area of the rebounding gases. While it is not required, I prefer to have a slight flow of seal air into the furnace to prevent a discharge of the products of combustion and furnace gases into the area below the furnace which under certain circumstances might provide an unacceptable working condition to the operators or those servicing the equipment.
  • my invention has another unobvious advantage over known types of seals. Quite frequently the slot between the movable and stationary members will fill with broken refractories, oxides of the metal being heated, or other debris that might be present within the furnace which will hinder the operation of the beam. In order that such an obstruction may be removed when using either a water seal or a mechanical seal it is necessary to shut down the furnace and disassemble the seal. With my invention the seal can be cleared by external mechanical means without shutting down the furnace or losing the effect of the seal in any portion of the furnace.
  • F IG. 1 is a side elevation, in section of a typical walking beam furnace with means for utilizing the method of my invention
  • FIG. 2 is a front elevation in section of the furnace at line I
  • a walking beam furnace includes a hearth 11 made from suitable refractory material 12.
  • Furnace 10 includes a walking beam or island 15 which is made from suitable refractory material.
  • the beam is movable to a position above the hearth level to move a work piece which spans the island.
  • the island and the hearth are separated by a slot 16 which extends substantially the length of the furnace.
  • Running the length of furnace and contiguous with the slot are alloy supports 17 for the supporting of the refractory material.
  • Island 15 includes support assembly 20 which includes means (not shown in detail) for moving the island forwardly, upwardly, backwardly, and downwardly in cyclic fashion to progressively move a work piece.
  • Aplenum or seal manifold 21 having a face plate 22 is provided along the length of the slot.
  • the manifold also is used as part of the hearth support system.
  • Manifold 21 is connected to a blower 23 by means of air pipes 24 and 25.
  • Face plate 22 is provided with a plurality of openings 26 along its length. For example, openings one-fourth inch in diameter spaced on threefourths inch centers for a slot approximately 1 inch wide has provided air streams susceptible to accurate regulation.
  • the air manifold By utilizing a support member as the air manifold, it is possible to cool the stationary hearth support simply by supplying air to the slot.
  • the island or beam support members are cooled by the impingement of the air from the manifold. Accordingly, it is preferred that the air supplied to the manifold for impingement be fairly cool, for example, less than F.
  • the velocity pressure of the air is approximately 0.57 inches W.C. 1f the pressure loss in the system is held to three velocity pressures 0r 3 X 0.57 l .71 inches W.C., the static pressure required at the fan is 1.7 l. inches +2.30 inches or 4 inches W.C. If the fan outlet velocity is 51 Ft/Sec., the total pressure required at the fan is 4.57 inches W.C., or 5 inches. Since 0.000157 hp is required to move 1.0 CFM against a total pressure of 1 inches W.C., the air horsepower necessary is:
  • the horsepower required would be 0.704 or approximately threefourths hp motor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)
  • Reciprocating Conveyors (AREA)
  • Furnace Details (AREA)
US00121850A 1971-03-08 1971-03-08 Method for sealing and cooling the component parts associated with the moving and stationary members of walking beam furnaces Expired - Lifetime US3721518A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12185071A 1971-03-08 1971-03-08

Publications (1)

Publication Number Publication Date
US3721518A true US3721518A (en) 1973-03-20

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ID=22399173

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US00121850A Expired - Lifetime US3721518A (en) 1971-03-08 1971-03-08 Method for sealing and cooling the component parts associated with the moving and stationary members of walking beam furnaces

Country Status (8)

Country Link
US (1) US3721518A (enrdf_load_stackoverflow)
JP (1) JPS5348109U (enrdf_load_stackoverflow)
AU (1) AU443891B2 (enrdf_load_stackoverflow)
CA (1) CA967745A (enrdf_load_stackoverflow)
ES (1) ES400235A1 (enrdf_load_stackoverflow)
FR (1) FR2129398A5 (enrdf_load_stackoverflow)
GB (1) GB1327541A (enrdf_load_stackoverflow)
IT (1) IT948282B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101363072B (zh) * 2008-09-27 2010-06-16 杭州金舟电炉有限公司 一种密封快冷室

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63151773U (enrdf_load_stackoverflow) * 1986-10-03 1988-10-05

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49886U (enrdf_load_stackoverflow) * 1972-04-04 1974-01-07

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101363072B (zh) * 2008-09-27 2010-06-16 杭州金舟电炉有限公司 一种密封快冷室

Also Published As

Publication number Publication date
AU443891B2 (en) 1974-01-03
DE2201088A1 (de) 1972-11-09
DE2201088B2 (de) 1972-11-09
FR2129398A5 (enrdf_load_stackoverflow) 1972-10-27
AU3777872A (en) 1973-07-12
CA967745A (en) 1975-05-20
GB1327541A (en) 1973-08-22
IT948282B (it) 1973-05-30
ES400235A1 (es) 1975-01-01
JPS5348109U (enrdf_load_stackoverflow) 1978-04-24

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