EP0377531B1 - Enceinte pour le traitement thermique d'objets - Google Patents

Enceinte pour le traitement thermique d'objets Download PDF

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Publication number
EP0377531B1
EP0377531B1 EP90400012A EP90400012A EP0377531B1 EP 0377531 B1 EP0377531 B1 EP 0377531B1 EP 90400012 A EP90400012 A EP 90400012A EP 90400012 A EP90400012 A EP 90400012A EP 0377531 B1 EP0377531 B1 EP 0377531B1
Authority
EP
European Patent Office
Prior art keywords
chamber
plates
chamber according
supports
enclosure
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
EP90400012A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0377531A1 (fr
Inventor
Robert Pernelle
Michel Agius
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.)
Selas SA
Original Assignee
Selas 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 Selas SA filed Critical Selas SA
Priority to AT90400012T priority Critical patent/ATE93049T1/de
Publication of EP0377531A1 publication Critical patent/EP0377531A1/fr
Application granted granted Critical
Publication of EP0377531B1 publication Critical patent/EP0377531B1/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
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • 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 peculiar to furnaces of these types
    • F27B9/32—Casings
    • F27B9/34—Arrangements of linings
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F27D1/0009—Comprising ceramic fibre elements

Definitions

  • the present invention relates to an enclosure for the thermal treatment of objects.
  • the invention relates in particular to a heat treatment oven, in particular for tempering flat glass.
  • the sheets of flat glass are moved horizontally on rollers and are heated to the tempering temperature of the glass, that is to say around 650 ° C.
  • the glass is softened and is therefore very sensitive to the presence of dust and therefore risks being contaminated by it.
  • the ovens currently used for tempering flat glass do not completely protect it from dust.
  • the flat glass can be contaminated by dust generated by the oven proper and by dust coming from outside of this oven.
  • the object of the present invention is to remedy the drawbacks of known embodiments, by creating a heat treatment enclosure and in particular an oven which protects objects to be treated from dust contamination.
  • the invention thus relates to an enclosure for the thermal treatment of objects, in particular an oven for heat treatment of flat glass, comprising inside its means of heating and means for supporting the objects to be treated, the walls of this enclosure comprising a thermally insulating lining, and a part of these walls being removable so as to be able to access the interior of the enclosure.
  • this enclosure is characterized in that substantially its entire inner surface is lined with plates placed side by side based on molten silica having a coefficient of thermal expansion close to zero.
  • the enclosure is thermally insulated at least in its upper part, by insulating blocks in contact with the outside face of said plates, these insulating blocks being constituted by mineral fiber wrapped in a flexible sheet. based on ceramic fibers.
  • said plates are supported by supports made of refractory material perpendicular to said plates, said mineral fiber insulating blocks being located between these supports and being in contact with them and the outside face of the plates.
  • These supports can be made of the same material as said plates.
  • the upper wall of the enclosure is fixed, while the upper part of the side walls is removable.
  • the enclosure 1 of the tempering furnace at around 650 ° C. of the flat glass 2 includes inside its electrical resistances lower 3 and upper 4 and rollers 5 for supporting and transporting the glass sheets 2 to be processed.
  • the enclosure 1 contains at its lower part tubular resistances 3 with radiant heating.
  • the upper resistors 4 are constituted for example by Ni-Cr bands folded in a zig-zag.
  • the enclosure 1 proper has the general shape of an elongated tunnel of rectangular section.
  • the glass sheets 2 are supported by rollers 5 mounted on bearings 6 and driven in rotation by a device 7 (see FIG. 1) placed outside the enclosure.
  • the bottom wall of the enclosure 1 comprises a base 8 made of refractory bricks.
  • the side walls also include, up to the level of the rollers 5, refractory bricks 9, 10, 11.
  • substantially the entire interior surface of the enclosure 1 is lined with plates 13, 14, 15, 16, 17 arranged side by side based on molten silica having a coefficient of thermal expansion close to zero.
  • These plates 13, 14, 15, 16, 17 relatively thin in order to have a low thermal inertia can be made of practically pure fused silica, such as the product sold under the brand GLASROCK which comprises more than 99.5% of silica, a density equal to 1.9 kg / dm3, a coefficient of thermal expansion equal to 0.6. 10 ⁇ 6 ° C ⁇ 1 and a thermal conductivity equal to 1 504.8 J h ⁇ 1 m ⁇ 1 ° C ⁇ 1 (0.36 Kcalh ⁇ 1m ⁇ 1 ° C ⁇ 1) at 260 ° C. This material continuously supports a temperature of 1200 ° C.
  • the aforementioned plates can also be made of ceramic containing silica and alumina as major constituents.
  • the enclosure 1 is thermally insulated in its upper part (upper wall and top of the side walls), by insulating blocks 18, 19, 20 in contact with the outer face of the plates 16, 17.
  • These insulating blocks 18, 19, 20 consist of mineral fiber 21 wrapped in a flexible sheet 22 based on ceramic fibers.
  • These fibers can be rock wool which supports a temperature of 1250 ° C.
  • the plates 17 easily support the blocks 20, without the need for metal reinforcements.
  • the sheet 22 which envelops the fibrous material of the blocks 18, 19, 20 can be made of paper composed of ceramic fibers (mainly SiO2, Al2O3) bonded together by an organic binder, such as KERLANE 50 paper. This paper is cut and folds easily.
  • these joints may be of very small width, taking into account the great dimensional stability of the aforementioned plates.
  • the insulating blocks 20 made of mineral fiber are wedged between these supports 23 and are in contact with these and the outside face of the plates 17.
  • the plates 23 forming a support comprise at their lower part and on each side a rib 27 molded in one piece with them and serving as a support for the plates 17.
  • the plates 23 forming a support and the plates 17 include ribs 28, 29 molded on said plates and serving as a support for the upper resistance 4. This therefore avoids any added metal part requiring drilling and electrical insulation for fix the resistor 4. The installation and the fixing of the resistor 4 are thus particularly simple.
  • FIGS. 1 and 2 It can also be seen in FIGS. 1 and 2 that the upper wall of the enclosure 1 is fixed, while the upper part 30 of the side walls is removable.
  • each of the upper parts 30 of the side walls is fixed to an arm 31 articulated on the one hand at the upper edge 30a of said wall part 30, and on the other hand to a fixed part of a frame 32 of the enclosure located above the upper wall thereof.
  • the upper edge 30a of said wall part 30 is connected to a hydraulic, pneumatic or other mechanism 33, allowing this wall part 30 to be moved between a closed position and an open position in which it is located (see on the left side of FIG. 1) above the opening 34 for access to the interior of enclosure 1.
  • FIG. 3 shows that the enclosure of the oven according to the invention comprises at its lower part nozzles 35 for sucking the air contained inside the enclosure 1 and at its upper part nozzles 36 for blowing sucked air.
  • the suction nozzles 35 open into a line 37 connected to a fan 38 outside the enclosure 1.
  • the blowing nozzles 36 are connected to a line 39 which extends above the oven.
  • a filter 40 is placed outside the enclosure downstream of the suction nozzles 35 and upstream of the fan 40.
  • the protection with respect to the dust of the oven enclosure could if necessary, be further reinforced, by putting the interior of this enclosure under slight overpressure, so as to avoid any risk of penetration of dust into the inside the enclosure.
  • This slight overpressure could be achieved by means of gas burners providing additional heating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Furnace Charging Or Discharging (AREA)
EP90400012A 1989-01-04 1990-01-03 Enceinte pour le traitement thermique d'objets Expired - Lifetime EP0377531B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90400012T ATE93049T1 (de) 1989-01-04 1990-01-03 Gefaess fuer die thermische behandlung von objekten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8900048 1989-01-04
FR8900048A FR2641369B1 (fr) 1989-01-04 1989-01-04 Enceinte pour le traitement thermique d'objets

Publications (2)

Publication Number Publication Date
EP0377531A1 EP0377531A1 (fr) 1990-07-11
EP0377531B1 true EP0377531B1 (fr) 1993-08-11

Family

ID=9377466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90400012A Expired - Lifetime EP0377531B1 (fr) 1989-01-04 1990-01-03 Enceinte pour le traitement thermique d'objets

Country Status (7)

Country Link
US (1) US4973349A (es)
EP (1) EP0377531B1 (es)
AT (1) ATE93049T1 (es)
DE (2) DE69002637T2 (es)
ES (1) ES2017599A4 (es)
FR (1) FR2641369B1 (es)
GR (1) GR900300154T1 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6131411A (en) * 1998-12-21 2000-10-17 Glasstech, Inc. Method and furnace for heating glass sheets
US8408029B2 (en) 2009-11-17 2013-04-02 Corning Incorporated Method for thermally conditioning molten glass
CN112146435B (zh) * 2020-09-25 2021-06-08 苏州汇科机电设备有限公司 轻质辊道炉的炉顶结构

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1728350A (en) * 1923-06-08 1929-09-17 Corning Glass Works Refractory product and method of making the same
US3151965A (en) * 1961-01-27 1964-10-06 Fort Pitt Bridge Works Method and apparatus for producting glass beads
US3199966A (en) * 1961-07-31 1965-08-10 Libbey Owens Ford Glass Co Method and apparatus for treating sheet glass
US3141756A (en) * 1962-01-16 1964-07-21 Corning Glass Works Glass forming element and method of manufacture
GB1034077A (en) * 1962-05-03 1966-06-29 Pilkington Brothers Ltd Improvements in or relating to apparatus and a method for annealing glass
US3337317A (en) * 1962-07-02 1967-08-22 Libbey Owens Ford Glass Co Method and apparatus for producing a continuous glass ribbon
DE2817006C2 (de) * 1978-04-19 1983-01-20 Estel Hoesch Werke Ag, 4600 Dortmund Vorrichtung zum Beheizen von offenen Materialschmelzebehältern, wie Verzinkungs-, Emallier-, Glas- o.dgl. -bäder in Wannen oder Becken
US4247000A (en) * 1979-07-16 1981-01-27 Ppg Industries, Inc. Ceramic conveyor rolls with metal end caps clamped thereto
US4322236A (en) * 1980-11-24 1982-03-30 Ppg Industries, Inc. Float glass forming chamber having low profile roof
US4450333A (en) * 1982-05-28 1984-05-22 At&T Technologies, Inc. Zirconia induction furnace
GB2138927B (en) * 1983-02-18 1986-09-03 Glaverbel Adding to silica refractory structures
GB2149771B (en) * 1983-11-14 1987-02-04 Jeffrey Rogers Morris Ceramic structure
FR2563897B1 (fr) * 1984-05-02 1988-03-04 Commans Bruno Four a faible inertie thermique destine en particulier a une installation de pyrolyse
GB8430312D0 (en) * 1984-11-30 1985-01-09 Pilkington Brothers Plc Glass melting tanks
HU203391B (en) * 1985-07-05 1991-07-29 Magyarovari Timfoeld Es Muekor Fireproof heat-insulating furnace-roof form cast from the melt of metal-oxides and furnace-roof made of the same
US4726831A (en) * 1987-01-12 1988-02-23 Corning Glass Works Molten glass delivery and conditioning system

Also Published As

Publication number Publication date
FR2641369B1 (fr) 1991-04-05
DE69002637D1 (de) 1993-09-16
DE377531T1 (de) 1991-02-07
EP0377531A1 (fr) 1990-07-11
ES2017599A4 (es) 1991-03-01
GR900300154T1 (en) 1991-09-27
FR2641369A1 (fr) 1990-07-06
DE69002637T2 (de) 1994-01-20
US4973349A (en) 1990-11-27
ATE93049T1 (de) 1993-08-15

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