EP0156745B1 - Four moufle pour traitements thermiques en continu par défilement - Google Patents

Four moufle pour traitements thermiques en continu par défilement Download PDF

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Publication number
EP0156745B1
EP0156745B1 EP19850420045 EP85420045A EP0156745B1 EP 0156745 B1 EP0156745 B1 EP 0156745B1 EP 19850420045 EP19850420045 EP 19850420045 EP 85420045 A EP85420045 A EP 85420045A EP 0156745 B1 EP0156745 B1 EP 0156745B1
Authority
EP
European Patent Office
Prior art keywords
zone
products
muffle
combustion gases
furnace according
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
Application number
EP19850420045
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0156745A1 (fr
Inventor
Michel Logue
Maurice Sadzot
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.)
Societe des Electrodes et Refractaires Savoie SA
Original Assignee
Societe des Electrodes et Refractaires Savoie 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 Societe des Electrodes et Refractaires Savoie SA filed Critical Societe des Electrodes et Refractaires Savoie SA
Priority to AT85420045T priority Critical patent/ATE26014T1/de
Publication of EP0156745A1 publication Critical patent/EP0156745A1/fr
Application granted granted Critical
Publication of EP0156745B1 publication Critical patent/EP0156745B1/fr
Expired 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0043—Muffle furnaces; Retort furnaces
    • 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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • 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
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/10—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by hot air or gas

Definitions

  • the present invention relates to a muffle furnace for heat treatments, continuously, by scrolling of products whose manufacturing cycle includes a passage of a determined duration at high temperature.
  • This is the case with certain refractories, carbonaceous products, for example impregnated electrodes, after a first firing, with a pyrolysable and coking carbonaceous substance, and also metals for their transformation, and metallic alloys, for example. example for the homogenization and the solid solution of the alloying elements.
  • heat treatment any operation in which one of the products defined above is brought to a high temperature in order to give it particular properties.
  • the present invention overcomes these drawbacks. It relates to a flame-heated muffle furnace for continuous heat treatment, by scrolling, at a temperature which can reach approximately 1100 to 1150 ° C., of products such as refractories, metals and alloys, carbon products, without direct contact. between the flame or the combustion gases and the product to be treated.
  • This oven has an inlet zone provided with a circulation preheating means, in a double jacket arranged around the muffle, of recycled combustion gases, a heating zone arranged inside a heat-insulated enclosure, provided with 'At least one means for circulating the combustion gases around the heating zone of the muffle and an outlet zone provided with at least one means for controlling the speed of cooling of the products.
  • FIG. 1 represents an embodiment of a muffle furnace according to the invention for cooking carbonaceous products impregnated with pitch, comprising a device for recovering pitch vapors, the combustion of which saves up to 90% of the fuel supplied to the burner.
  • the oven has an inlet zone, constituted by a tunnel (1) provided with a removable cover (2) into which the product to be heat treated (3) is introduced by usual handling means not shown, for example by a roller table.
  • the actual oven is constituted by an insulating refractory enclosure (4) substantially parallelepiped which forms the combustion chamber (5).
  • the inlet of the oven has a preheating section (6) constituted by a double jacket (7) in which circulate hot gases recovered in the combustion zone, and circulated by the recycling fan (8).
  • combustion gases both the combustion gases coming directly from the burner, as the gases circulated in the various circuits of the furnace, whether these gases are pure or diluted by outside air to lower the temperature.
  • the muffle itself is a cylindrical tube (10) arranged horizontally in the upper part of the oven. It is made of refractory steel, preferably with a high nickel content, so as to withstand operating temperatures which can reach approximately 1100 to 1150 ° C., without this value constituting a limitation of the invention.
  • the internal section of the oven is slightly larger (by 5 to 20% for example) than the maximum outside diameter of the products to be treated or, if necessary, of the container filled with products to be treated.
  • two longitudinal rails guide the products during the scrolling, which is done from right to left in the case shown.
  • the movement of the products to be treated is generally ensured by pushing, the advance movement being able to be continuous or step by step according to the requirements of the treatment carried out.
  • the heating of the furnace is ensured by a burner (11) with gaseous, liquid or solid pulverized fuel, provided with an adjustable air supply with a large excess, if necessary, for a reason which will be specified below, and which one can also supply preheated air through an exchanger arranged in the combustion or cooling gas circuit of the outlet zone.
  • the combustion gases are circulated by the fan (12) and the partition (13).
  • the arrows indicate, approximately, the path of the combustion gases.
  • the partition (13) determines, with the external wall (14), a passage (15) which opens onto the muffle, in the transition zone between the heating zone and the outlet zone.
  • the combustion gases circulate around the muffle, in a path roughly shown diagrammatically by the arrows, which ensures remarkable temperature uniformity throughout this part of the muffle.
  • one or more devices for recycling the combustion gases and for possible introduction of outside air are provided, according to the usual methods, by means of the flaps (18). , (19), (29), in order to supply the double jacket (7) of the preheating zone (6) with hot gas, and, if necessary, the burner (11) with preheated air.
  • the structure of the recycling circuit is given as an indication, and does not constitute a limiting characteristic of the invention.
  • the oven, object of the invention is particularly suitable for the particular case where the products to be heat treated are carbonaceous refractory products impregnated with carbonaceous substance, such as pitch, the pyrolysis of which gives combustible vapors.
  • carbonaceous substance such as pitch
  • the possibility of controlling the temperature in the pyrolysis zone is a particularly advantageous characteristic of the invention. It is known, in fact, that in order to obtain the maximum coking yield of the impregnation product, the speed of temperature rise of the impregnated product and the duration of maintenance at a predetermined temperature must be determined with precision, which is easily achievable in the muffle furnace, object of the invention.
  • the preheating zone (7) is supplied by the combustion gases possibly diluted with outside air.
  • the pyrolysis and coking zone (25) has a double envelope (27) in which the combustion gases from the final cooking zone circulate, optionally diluted with outside air and / or combustion gases from the preheating zone.
  • the combustion gases are evacuated through the chimney (17).
  • the shutters such as (18) (19) allow the necessary flow adjustments.
  • the outlet zone includes means for controlled cooling, either slowed down or accelerated, depending on the requirements of the product treated and the heat treatment cycle used.
  • the part of the muffle (30) emerging in the exit zone can be either insulated, or exposed to the open air over all or part of its length, or subjected to cooling by forced ventilation - and possible recovery of the hot air to supply the burner - or by suction or spraying of a fluid such as water.
  • cooling control arrangements can be provided, such as a double jacket (31) with a circulation of a liquid or gaseous fluid, or, on the contrary, an insulation static, for example if we treat a metal billet intended to feed a hot spinning press or a combination of thermal insulation at the exit of the hot zone, followed by an accelerated cooling zone.
  • the outlet may also comprise, symmetrically with the inlet, an outlet tunnel (32) with a removable cover (33) for extracting the processed product.
  • the oven When the oven is in operation, it operates with an external fuel supply corresponding to approximately 200 therms (836 MJ) per tonne of product to be cooked, whereas in current static ovens, this consumption is around 1800 therms / around ton (7524 MJ), - which does not go below 600 therms / ton in the best case, for other types of static ovens - ie a fuel saving close to 90%.
  • the rate of temperature rise, for electrodes with a diameter of 300 mm can wait for 150 ° C per hour whereas it hardly exceeds 12 to 15 ° / hour in static ovens and 40 to 50 ° C at most. in ovens where the products are in direct contact with the flame.
  • the muffle extends outside the oven enclosure (4) for a few meters. In a first zone, the muffle cools spontaneously with ambient air. In the second zone, the muffle is cooled by a circulation of cold water in the double jacket (31). At the outlet, the products are at a temperature below 400 ° C.
  • the invention applies to the treatment of certain refractory, special products such as bricks or shaped parts in magnesia impregnated with pitch, raw carbon products, and different types of cylindrical carbon products, such as electrodes, nipple bars, tubular products for the chemical industry and also for products of smaller dimensions, such as coals for electric batteries, which are introduced in the raw state, untreated, in packages in open containers made of refractory steel, which makes it possible to operate in the same cylindrical block; it is also obviously possible to adapt the shape and dimensions of the muffle to those of the products to be treated.
  • special products such as bricks or shaped parts in magnesia impregnated with pitch, raw carbon products, and different types of cylindrical carbon products, such as electrodes, nipple bars, tubular products for the chemical industry and also for products of smaller dimensions, such as coals for electric batteries, which are introduced in the raw state, untreated, in packages in open containers made of refractory steel, which makes it possible to operate in the same cylindrical block; it is also obviously possible
  • the oven allows the cooking of any product, carbon or refractory, impregnated with a pyrolyzable substance providing, like pitches, combustible vapors: this is particularly the case for resins based on organic polymers such as phenol-formaldehyde and polymetracrylates p O'l r to cite only the best known.
  • this oven for the treatment of products other than products impregnated with pitch, such as bars and billets of metals and alloys (based on aluminum, copper, or iron to name the most common).
  • the heating zone ensures over the entire length of each billet, a constant and homogeneous treatment temperature, which makes it possible to carry out, under ideal conditions, homogenization or setting treatments. solid or tempering or heating solution before spinning, or forging, or stamping, or even rolling, with a temperature accuracy of the order of a degree.
  • the billets, raw continuous casting, were homogenized by heating to 485 ° C, then, at the outlet of the oven, the outlet area of which was thermally insulated, directly introduced into the container of a spinning press the temperature of the billet , in the container, was 455 ° C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Tunnel Furnaces (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Resistance Heating (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Artificial Filaments (AREA)
  • Air Bags (AREA)
  • Furnace Details (AREA)
EP19850420045 1984-03-14 1985-03-13 Four moufle pour traitements thermiques en continu par défilement Expired EP0156745B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85420045T ATE26014T1 (de) 1984-03-14 1985-03-13 Muffelofen vom tunneltyp zur thermischen behandlung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8404330 1984-03-14
FR8404330A FR2561365B1 (fr) 1984-03-14 1984-03-14 Four moufle pour traitements thermiques en continu, par defilement

Publications (2)

Publication Number Publication Date
EP0156745A1 EP0156745A1 (fr) 1985-10-02
EP0156745B1 true EP0156745B1 (fr) 1987-03-18

Family

ID=9302263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850420045 Expired EP0156745B1 (fr) 1984-03-14 1985-03-13 Four moufle pour traitements thermiques en continu par défilement

Country Status (12)

Country Link
US (1) US4568279A (es)
EP (1) EP0156745B1 (es)
JP (1) JPS60213787A (es)
KR (1) KR920001359B1 (es)
AT (1) ATE26014T1 (es)
BR (1) BR8501121A (es)
CA (1) CA1228704A (es)
DE (1) DE3560094D1 (es)
ES (1) ES8606621A1 (es)
FR (1) FR2561365B1 (es)
IN (1) IN164159B (es)
ZA (1) ZA851883B (es)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4863374A (en) * 1987-03-27 1989-09-05 Edward Orton, Jr., Ceramic Foundation Kiln with ventilation system
JPH0159306U (es) * 1987-10-07 1989-04-13
US5040470A (en) * 1988-03-25 1991-08-20 Shell Western E&P Inc. Steam generating system with NOx reduction
US5002484A (en) * 1988-03-25 1991-03-26 Shell Western E&P Inc. Method and system for flue gas recirculation
US5011802A (en) * 1990-01-22 1991-04-30 A.P. Green Industries, Inc. Coking tar impregnated refractory products
US5417198A (en) * 1992-11-24 1995-05-23 Williams; Robert W. Ethanol incinerating baking oven
ES2070761B1 (es) * 1993-06-21 1996-02-16 Aleaciones De Metales Sinteriz Perfeccionamientos en los hornos para la sinterizacion de aceros.
US6135765A (en) * 1998-09-28 2000-10-24 Jamaluddin; Aziz A. Pyrocleaning furnace and thermal oxidizer system
US6280182B1 (en) * 2000-05-30 2001-08-28 Kanto Yakin Kogyo K.K. Disposal of gas evaporated with heat treatment
US6512206B1 (en) 2002-01-02 2003-01-28 Mrl Industries Continuous process furnace
ATE392594T1 (de) * 2004-08-04 2008-05-15 Ibiden Co Ltd Durchlaufbrennofen und verfahren zur herstellung eines porösen keramikglieds damit
RU2313746C1 (ru) * 2006-05-02 2007-12-27 Артем Юрьевич Чайка Туннельная печь для обжига керамических изделий
US20200354859A1 (en) * 2017-11-02 2020-11-12 Furnace Engineering Pty Ltd Controlled atmosphere recirculation oven
CN109059559B (zh) * 2018-09-18 2023-09-22 平顶山东方碳素股份有限公司 一种立式电加热热风循环预热炉

Family Cites Families (18)

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US1875365A (en) * 1932-09-06 begeman
US901956A (en) * 1906-02-07 1908-10-27 Stanley G I Electric Mfg Company Annealing-furnace.
US1213876A (en) * 1916-07-25 1917-01-30 Christopher C Hovis Animal-trap.
GB404328A (en) * 1931-05-21 1934-01-08 Harrop Ceramic Service Company Improvements in tunnel kilns
US2026737A (en) * 1934-06-02 1936-01-07 L J House Convex Glass Company Leer
US2463222A (en) * 1943-07-20 1949-03-01 Electric Furnace Co Heat-treating apparatus
FR1103003A (fr) * 1954-03-29 1955-10-28 Procédé de traitement thermique industriel à haute température sous atmosphère contrôlée et four pour l'application dudit procédé
US2939695A (en) * 1957-07-15 1960-06-07 Gates Paul Ore roasting furnace
DE1213876B (de) * 1958-11-26 1966-04-07 Siemens Ag Konvektionsstandofen
FR1415944A (fr) * 1964-10-26 1965-10-29 West Midlands Gas Board Four pour produits céramiques
US3540710A (en) * 1967-12-14 1970-11-17 Tokyo Gas Co Ltd Gas annealing furnace
US3603570A (en) * 1968-04-01 1971-09-07 S C E I Soc Costruz Elettroter Bell furnace for annealing treatment of metal sheets
US3658016A (en) * 1970-04-27 1972-04-25 Paul W Parker Incinerator
US3833208A (en) * 1973-05-04 1974-09-03 Allegheny Ludlum Ind Inc Muffle furnace
US3869249A (en) * 1974-03-22 1975-03-04 Indian Head Inc Curing oven
JPS5632877Y2 (es) * 1977-04-30 1981-08-04
US4217090A (en) * 1978-08-22 1980-08-12 B & K Machinery International Limited Oven heating system
US4285325A (en) * 1979-09-28 1981-08-25 William W. Weaver Balancing air device for a heating unit

Also Published As

Publication number Publication date
JPS60213787A (ja) 1985-10-26
JPS628712B2 (es) 1987-02-24
FR2561365B1 (fr) 1987-10-09
ES541214A0 (es) 1986-04-01
ZA851883B (en) 1985-11-27
BR8501121A (pt) 1985-11-05
US4568279A (en) 1986-02-04
ATE26014T1 (de) 1987-04-15
CA1228704A (fr) 1987-11-03
IN164159B (es) 1989-01-21
KR850007877A (ko) 1985-12-09
DE3560094D1 (en) 1987-04-23
FR2561365A1 (fr) 1985-09-20
ES8606621A1 (es) 1986-04-01
KR920001359B1 (ko) 1992-02-11
EP0156745A1 (fr) 1985-10-02

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