EP0717830A1 - Four de passage continu - Google Patents

Four de passage continu

Info

Publication number
EP0717830A1
EP0717830A1 EP95921694A EP95921694A EP0717830A1 EP 0717830 A1 EP0717830 A1 EP 0717830A1 EP 95921694 A EP95921694 A EP 95921694A EP 95921694 A EP95921694 A EP 95921694A EP 0717830 A1 EP0717830 A1 EP 0717830A1
Authority
EP
European Patent Office
Prior art keywords
continuous furnace
heating zone
hot air
furnace according
air lines
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.)
Granted
Application number
EP95921694A
Other languages
German (de)
English (en)
Other versions
EP0717830B1 (fr
Inventor
Bernd Kölln
Henning Richter
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.)
Riedhammer GmbH
Riedhammer GmbH and Co KG
Original Assignee
Riedhammer GmbH
Riedhammer GmbH and Co KG
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 Riedhammer GmbH, Riedhammer GmbH and Co KG filed Critical Riedhammer GmbH
Publication of EP0717830A1 publication Critical patent/EP0717830A1/fr
Application granted granted Critical
Publication of EP0717830B1 publication Critical patent/EP0717830B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 peculiar to furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • 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
    • F27B9/12—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity with special arrangements for preheating or cooling the charge
    • 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
    • F27B9/36—Arrangements of heating devices

Definitions

  • the invention relates to a continuous furnace for firing ceramic molded parts.
  • continuously furnace stands for all types of continuously operating furnaces, for example tunnel furnaces with kiln cars or roller furnaces.
  • These continuous furnaces are usually constructed as follows (viewed in the direction of transport of the goods): via an entrance, the fired goods first pass through a heating zone, then a firing zone and finally a cooling zone before being removed from the furnace outlet.
  • Ceramic molded parts basically encompasses all types of ceramic molded bodies, such as porcelain, sanitary ware, etc. However, special ceramic products, such as ferrites, for example soft ferrites, are also expressly included.
  • Such soft ferrites are distinguished by the fact that they are produced using a binder / pressing aid and processed into molded parts.
  • These additives generally consist of organic substances, such as polyvinyl alcohol.
  • the soft ferrites mentioned show a special behavior during the firing process compared to conventional ceramic products. When heated in the furnace, ie in the heating zone, these additives burn out, so that the furnace atmosphere is contaminated with organic components.
  • REPLACEMENT LEAF DE 32 32 294 C1 describes a method for sintering soft ferrites in a chamber furnace, that is to say a discontinuously operating furnace, in which the furnace atmosphere is additionally heated outside the furnace chamber during the so-called "binder phase", and This is due to the fact that the binders volatilizing during the binder phase are continuously burned in the circulation circuit outside the furnace chamber, and the resulting combustion gases remain in the circulation circuit and only the excess gas quantities are removed.
  • the gas supplied to the furnace chamber should be practically “inert". In this way, however, the furnace atmosphere cannot be controlled in the desired manner.
  • the known method is limited to a discontinuous furnace.
  • the invention is based on the object of specifying a continuous furnace which fulfills the following features: the energetically active constituents present in the flue gas of the furnace, in particular the binder components which outgas in the heating zone, are to be used for thermal purposes.
  • a defined furnace atmosphere should be adjustable, especially in the heating zone.
  • the overall pyroprocess is to be optimized in terms of energy.
  • the furnace has a heating, a burning and a cooling zone
  • At least one flue gas line runs from the heating zone into a combustion chamber
  • REPLACEMENT LEAF at least one hot air line leads from the combustion chamber back to the heating zone
  • the hot air line branches in front of the heating zone into a plurality of warm air lines which open into the heating zone at a distance from one another,
  • Such a continuous furnace has the following advantages: hot air is drawn off from the heating zone at one or more points, which is loaded, for example, with gaseous binder components which outgass the ceramic molded parts during the heating phase.
  • the combustion gases are then fed to a combustion chamber, burned there, so that a largely cleaned hot air can then be returned to the heating zone.
  • the combustion chamber can be arranged in the furnace, but separately from the furnace duct, for example below the furnace duct or externally.
  • the recirculated hot air has, for example, a temperature of 600 to 1,000 ° C and is therefore significantly above the temperature that is required in the heating zone.
  • the temperature in the pickling zone - viewed in the transport direction of the firing material - is different (increasing).
  • the maximum temperature of the furnace atmosphere in the heating zone is usually well below the aforementioned 1,000 ° C., namely, for example, 600 ° C.
  • the temperature and the amount and type of cold air (gas) supplied can be used to set the temperature of the air returned to the heating zone and, on the other hand, it is also possible at the same time to influence the desired type of atmosphere (for example the oxygen content of the supplied air) via the cold air .
  • the desired type of atmosphere for example the oxygen content of the supplied air
  • One embodiment of the invention provides for the hot air lines - viewed in the direction of transport of the goods - to be arranged one behind the other along the pickling zone, with warm air preferably being supplied on both sides to make the furnace atmosphere more uniform.
  • warm air preferably being supplied on both sides to make the furnace atmosphere more uniform.
  • REPLACEMENT LEAF lines are fed vertically one above the other into the heating zone to ensure an even supply of warm air over the height of the furnace duct.
  • each warm air line is assigned its own cold air line
  • the temperature and atmosphere of the returned warm air can be set individually.
  • One embodiment of the invention provides that the amount of cold air supplied from the cold air lines or its temperature can be regulated or controlled in accordance with a preselectable temperature / atmosphere profile for the continuous furnace.
  • the regulation or control can take place, for example, for a corresponding valve in the connection area of the cold air lines to the respective warm air line.
  • the external combustion chamber can be arranged at a suitable location and is equipped, for example, with one or more own burners. Any excess air can be removed via a chimney.
  • the continuous furnace itself can be supplied with energy in a conventional manner, for example with gas or electrical heating elements.
  • the heating zone can be heated practically without primary energy, so that burners or electrical heating are not absolutely necessary in this area.
  • the reference numeral 10 shows a tunnel oven which has an oven inlet 12, a heating zone 14, a combustion zone 16 and a cooling zone 18 and an oven outlet 20.
  • the transport path of the fired material passed through the furnace 10 is shown by the arrow T.
  • a flue gas line 22 runs from the heating zone into a combustion chamber 24 which is fired with a burner 26.
  • a hot air line 28 runs back from the combustion chamber 24 in the direction of the heating zone 14. Before entering the heating zone 14, however, the hot air line 28 branches into six partial lines (called warm air lines) and identified by the reference number 30.
  • the hot air lines 30 each open in pairs from the left and right through the furnace wall into the furnace duct and are arranged one behind the other in the transport direction T on each furnace side.
  • a cold air line 32 leads to each warm air line 30, a control valve 34 being arranged in each case in the transition area, so that the amount of cold air supplied can be set. Likewise, the temperature of the cold air supplied to the individual warm air lines 30 can of course also be individually adjusted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Furnace Details (AREA)

Abstract

Un four continu de cuisson de pièces moulées céramiques comprend une zone de chauffage (14), une zone de cuisson (16) et une zone de refroidissement (18). Au moins un conduit de gaz de fumée (22) part de la zone de chauffage et se termine dans une chambre de combustion (24), et au moins un conduit d'air chaud (28) part de la chambre de combustion (24) et revient à la zone de chauffage (14). L'air chaud chargé de fractions de liant est extrait de la zone de chauffage à un ou plusieurs endroits. Les gaz de combustion sont ensuite ramenés à la chambre de combustion et y sont brûlés, de sorte qu'il est possible de ramener à la zone de chauffage de l'air chaud purifié dans une large mesure.
EP95921694A 1994-06-10 1995-06-09 Four de passage continu Expired - Lifetime EP0717830B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4420295 1994-06-10
DE4420295A DE4420295C1 (de) 1994-06-10 1994-06-10 Durchlaufofen
PCT/DE1995/000778 WO1995034793A2 (fr) 1994-06-10 1995-06-09 Four de passage continu

Publications (2)

Publication Number Publication Date
EP0717830A1 true EP0717830A1 (fr) 1996-06-26
EP0717830B1 EP0717830B1 (fr) 1998-09-16

Family

ID=6520263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95921694A Expired - Lifetime EP0717830B1 (fr) 1994-06-10 1995-06-09 Four de passage continu

Country Status (6)

Country Link
US (1) US6116894A (fr)
EP (1) EP0717830B1 (fr)
JP (1) JP3047192B2 (fr)
AU (1) AU2668195A (fr)
DE (1) DE4420295C1 (fr)
WO (1) WO1995034793A2 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1007623C2 (nl) * 1997-11-26 1999-05-31 Dijk Heating B V Van Inrichting voor het verwarmen van fluïdum.
EP1036048B2 (fr) * 1997-12-02 2022-03-30 Corning Incorporated Procede de cuisson de corps en ceramique nid d'abeille
EP1049904B2 (fr) † 1997-12-22 2014-10-01 Corning Incorporated Four tunnel de cuisson de corps en ceramique nid d'abeille
NZ523920A (en) 2003-01-31 2005-11-25 Fonterra Co Operative Group Methods for extracting lipids from diary products using a near critical phase fluid
CN101316521B (zh) 2005-04-28 2014-06-25 恩兹默泰克有限公司 极性脂质混合物、其制备和应用
US8046932B2 (en) 2006-10-12 2011-11-01 Usnr/Kockums Cancar Company Method and apparatus for inhibiting pitch formation in the wet seal exhaust duct of a veneer dryer
US8196310B2 (en) 2007-02-09 2012-06-12 Usnr/Kockums Cancar Company Method and apparatus for controlling cooling temperature and pressure in wood veneer jet dryers
US20090206500A1 (en) * 2008-02-19 2009-08-20 Michael Maguire Pre-heated combustion air in treating ceramic components
EP2634161A4 (fr) 2010-10-29 2014-04-16 Sumitomo Chemical Co Procédé de production de corps cuit et four de cuisson utilisé aux fins du procédé
US9080235B2 (en) 2012-04-17 2015-07-14 Jamar International Corporation Composition and method for diffusion alloying of ferrocarbon workpiece
ITRE20120058A1 (it) * 2012-09-21 2014-03-22 Sacmi Forni Spa Forno per la cottura in continuo di laterizi su supporti a cassetta
DE102013010885A1 (de) * 2013-07-01 2015-01-22 Eisenmann Ag Verfahren zum Sintern von Sinterwerkstücken sowie Anlage hierfür
CN104359309B (zh) * 2014-09-25 2017-01-18 深圳市时代高科技设备股份有限公司 一种全自动真空预热炉

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DE736398C (de) * 1938-03-03 1943-06-15 Heimsoth Vollmer Dressler G M Tunnelofen fuer die Herstellung von Isoliersteinen
US2750680A (en) * 1952-08-02 1956-06-19 Oxy Catalyst Inc Method for treating materials
FR1255054A (fr) * 1960-01-21 1961-03-03 Stein & Roubaix Perfectionnement aux fours de chauffage de métaux à haute température, par flammedirecte, sans oxydation
US3437321A (en) * 1966-05-27 1969-04-08 B & K Machinery Int Ltd Regenerative paint drying system for continuous strip
ES375321A1 (es) * 1969-01-10 1972-05-01 S C E I Societa Construzioni E Perfeccionamientos en sistemas para el calentamiento de hornos continuos.
US3606279A (en) * 1969-10-08 1971-09-20 United States Steel Corp Apparatus for heat treating a sheet
US3787171A (en) * 1972-06-15 1974-01-29 Hunter Eng Co Closed loop, inert atmosphere, paint line oven heat source
US4140467A (en) * 1975-06-09 1979-02-20 Kenneth Ellison Convection oven and method of drying solvents
JPS53104610A (en) * 1977-02-08 1978-09-12 Shinagawa Refractories Co Tunnel kilns for reheating carbonaceous material impregnated with tar and pitch
US4133636A (en) * 1977-06-30 1979-01-09 Blu-Surf, Inc. Tentor
FR2420109A2 (fr) * 1978-03-13 1979-10-12 Machinery International Ltd Bk Fours de traitement thermique
DE3232294C1 (de) * 1982-08-31 1983-12-29 Rudolf 5160 Düren Brands Verfahren und Vorrichtung zum Sintern von Keramikformlingen, insbesondere von Weichferriten
US4503018A (en) * 1983-02-14 1985-03-05 Davy Mckee Corporation Desulfurization of phosphogypsum
US4662840A (en) * 1985-09-09 1987-05-05 Hunter Engineering (Canada) Ltd. Indirect fired oven system for curing coated metal products
DE3632918A1 (de) * 1986-09-27 1988-06-09 Haessler Andreas Tunnelofen mit nebenstrom-nachverbrennung
JP2543565B2 (ja) * 1988-03-31 1996-10-16 日本碍子株式会社 セラミックスの焼成に用いるトンネル炉
DE3908758C1 (en) * 1989-03-17 1990-04-19 Hans Lingl Anlagenbau Und Verfahrenstechnik Gmbh & Co Kg, 7910 Neu-Ulm, De Tunnel furnace for baking light bricks
DE3923887A1 (de) * 1989-07-19 1991-01-24 Manfred Leisenberg Kg Tunnelofen
JP2859987B2 (ja) * 1991-12-24 1999-02-24 日本碍子株式会社 連続焼成炉の温度制御装置

Non-Patent Citations (1)

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Title
See references of WO9534793A3 *

Also Published As

Publication number Publication date
WO1995034793A3 (fr) 1996-01-18
WO1995034793A2 (fr) 1995-12-21
JP3047192B2 (ja) 2000-05-29
US6116894A (en) 2000-09-12
JPH09502012A (ja) 1997-02-25
EP0717830B1 (fr) 1998-09-16
DE4420295C1 (de) 1995-10-26
AU2668195A (en) 1996-01-05

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