US3813217A - Furnace for the thermic treatment of products supported by a gas cushion - Google Patents

Furnace for the thermic treatment of products supported by a gas cushion Download PDF

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Publication number
US3813217A
US3813217A US00231142A US23114272A US3813217A US 3813217 A US3813217 A US 3813217A US 00231142 A US00231142 A US 00231142A US 23114272 A US23114272 A US 23114272A US 3813217 A US3813217 A US 3813217A
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United States
Prior art keywords
furnace
hearth
products
channel
gases
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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
US00231142A
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English (en)
Inventor
J Moussou
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.)
Ceraver SA
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Ceraver SA
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 Ceraver SA filed Critical Ceraver SA
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Publication of US3813217A publication Critical patent/US3813217A/en
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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 tunnel furnace
    • F27B9/24—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 being carried by a conveyor
    • F27B9/2476—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 being carried by a conveyor the conveyor being constituted by air cushion

Definitions

  • ABSTRACT Thermal treatment oven for products supported by a gas cushion, comprising a hearth provided with passages for the supporting gases, said hearth consisting of contiguous elements assembled longitudinally; the oven comprises, for example, a pushing device, giving the elements of the hearth a slow linear movement along its longitudinal axis.
  • This hearth is subjected to mechanical stresses due to its weight and to gas pressure, while it is brought to a high temperature, whereas its porous nature or the presence of holes reduces the mechanical strength thereof.
  • the maintenance of the hearth, and its rapid repair therefore, constitute one of the greatest problems in this type of furnace.
  • the furnace consists essentially of a channel which a hearth 2, consisting of contiguous elements 3, divides into two parts 4 and 5.
  • the contiguous elements 3 are porous or drilled with holes 6 allowing the gases brought at 4 to a pressure greater than that which prevails at 5 to pass.
  • heating and gas flow devices which do not form a part of the invention, and are known per se, are not illustrated.
  • the drilled or porous hearth 2 crossed by a gas current which constitutes the gas cushion on which the products to be treated move can move, for example, under the effect of a motordriven pusher 9 on the uprights 7 and 8.
  • a motordriven pusher 9 on the uprights 7 and 8.
  • Devices such as the motor-driven pusher 9 are also known per se, but previously they have been used exclusively with supports for products to be fired in furnaces of a conventional type, without a gas cushion.
  • the motor-driven pusher 9 is used to cyclically introduce into the furnace fresh elements 3A, while simultaneously pushing the previously introduced elements 3 towards the outlet end of the furnace.
  • the invention proposes to give a simple solution for the problem of surveying the stateand rapid repairing of the hearth, not requiring the stopping of the furnace. Thus, it proposes to ensure continuous operation of such furnaces during very long periods. Lastly, it proposes to prolong-the operating period of the part of the hearth subjected to the severest thermo-mechanical Stresses.
  • FIG. 1 shows the entrance zone of the furnace in a longitudinal sectional view.
  • FIG. 2 shows it in a transversal sectional view.
  • the furnace thus produced enables not only surveying and easy maintenance of the hearth, but also improves the service conditions by limiting the exposure period of the elements forming the hearth in the high thermo-mechanical stress zone, for a same operating period.
  • the elements need not occupy the whole width of the furnace, but only a fraction thereof, the furnace com prising, then, one or several low longitudinal walls intended for supporting the edges of the elements which do not rest on its lateral uprights.
  • the holes 6 of the contiguous elements canbe oblique in relation to the longitudinal plane of symmetry of the furnace and/or in the direction of the progression of the products subjected to thermal treatment, so as to exert, on these, a centering and/or propelling effect.
  • a housing defining a channel
  • a hearth enclosed within said housing and dividing said channel into an upper part and a lower part, said hearth comprising a plurality of contiguous elements placed side by side longitudinally in said channel and provided with passages for said gases;
  • a furnace as claimed in claim 1 wherein said means for moving said products through said furnace is adapted to move said products at a speed faster than the slow speed at which said mechanical means move the elements of said hearth through said furnace.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
US00231142A 1971-03-09 1972-03-02 Furnace for the thermic treatment of products supported by a gas cushion Expired - Lifetime US3813217A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7108072A FR2128930A5 (it) 1971-03-09 1971-03-09

Publications (1)

Publication Number Publication Date
US3813217A true US3813217A (en) 1974-05-28

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ID=9073185

Family Applications (1)

Application Number Title Priority Date Filing Date
US00231142A Expired - Lifetime US3813217A (en) 1971-03-09 1972-03-02 Furnace for the thermic treatment of products supported by a gas cushion

Country Status (5)

Country Link
US (1) US3813217A (it)
DE (1) DE2209072A1 (it)
FR (1) FR2128930A5 (it)
GB (1) GB1367382A (it)
IT (1) IT959560B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565136A (en) * 1983-03-01 1986-01-21 Kawasaki Jukogyo Kabushiki Kaisha Fluidized bed combustion furnace

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3037956C2 (de) * 1980-10-08 1983-11-03 Dr. C. Otto & Co. Gmbh, 4630 Bochum Einrichtung zur Verbesserung des Strömungsverlaufes der in den Verbrennungsraum von technischen Gasfeuerungen, insbesondere von Koksöfen, eintretenden Gase
GB9103962D0 (en) * 1991-02-26 1991-04-10 Cmb Foodcan Plc An oven
GB2259234B (en) * 1991-09-05 1995-08-09 Ian Duncan Mcfarlane Food processing
SG73538A1 (en) * 1997-08-04 2000-06-20 Matsushita Electric Ind Co Ltd Method of heat treating object and apparatus for the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678237A (en) * 1948-09-13 1954-05-11 Svenska Flaektfabriken Ab Device for supporting and conveying materials
US3325157A (en) * 1964-07-08 1967-06-13 Norton Co Firing of grinding wheels and the like in a tunnel furnace
US3375094A (en) * 1965-01-11 1968-03-26 Permaglass Method and apparatus for shaping glass or the like on a curved gas support bed
US3374996A (en) * 1965-01-22 1968-03-26 William R. Keough Method and apparatus for conveying workpieces
US3455669A (en) * 1966-05-09 1969-07-15 Permaglass Apparatus for heat treating glass on a fluid support
US3455671A (en) * 1966-05-09 1969-07-15 Permaglass Gas support bed apparatus for treating glass

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678237A (en) * 1948-09-13 1954-05-11 Svenska Flaektfabriken Ab Device for supporting and conveying materials
US3325157A (en) * 1964-07-08 1967-06-13 Norton Co Firing of grinding wheels and the like in a tunnel furnace
US3375094A (en) * 1965-01-11 1968-03-26 Permaglass Method and apparatus for shaping glass or the like on a curved gas support bed
US3374996A (en) * 1965-01-22 1968-03-26 William R. Keough Method and apparatus for conveying workpieces
US3455669A (en) * 1966-05-09 1969-07-15 Permaglass Apparatus for heat treating glass on a fluid support
US3455671A (en) * 1966-05-09 1969-07-15 Permaglass Gas support bed apparatus for treating glass

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565136A (en) * 1983-03-01 1986-01-21 Kawasaki Jukogyo Kabushiki Kaisha Fluidized bed combustion furnace

Also Published As

Publication number Publication date
FR2128930A5 (it) 1972-10-27
IT959560B (it) 1973-11-10
GB1367382A (en) 1974-09-18
DE2209072A1 (de) 1972-09-14

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