EP0162832A1 - Four, en particulier, four électrique - Google Patents

Four, en particulier, four électrique Download PDF

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Publication number
EP0162832A1
EP0162832A1 EP85890087A EP85890087A EP0162832A1 EP 0162832 A1 EP0162832 A1 EP 0162832A1 EP 85890087 A EP85890087 A EP 85890087A EP 85890087 A EP85890087 A EP 85890087A EP 0162832 A1 EP0162832 A1 EP 0162832A1
Authority
EP
European Patent Office
Prior art keywords
gas
combustion chamber
kiln according
furnace
storage container
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.)
Withdrawn
Application number
EP85890087A
Other languages
German (de)
English (en)
Inventor
Karl Dipl.-Ing. Bartsch
Josef Hausner
Walter Wagner
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.)
Vereinigte Edelstahlwerke AG
Original Assignee
Vereinigte Edelstahlwerke AG
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 Vereinigte Edelstahlwerke AG filed Critical Vereinigte Edelstahlwerke AG
Publication of EP0162832A1 publication Critical patent/EP0162832A1/fr
Withdrawn legal-status Critical Current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
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/02—Ohmic resistance heating
    • 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
    • F27B5/06—Details, accessories or equipment specially adapted for furnaces of these types

Definitions

  • the invention relates to a furnace, in particular an electrically heatable furnace, with at least one combustion chamber for a housing surrounding a material to be burned, heating device, device (s) for introducing and discharging the goods, and device (s) that permit entry and / or exit of gases (t) (en)
  • Such furnaces are particularly suitable for firing ceramic goods in the broadest sense, mostly based on silicate, sintered and hard materials, glass flows, enamels, and also, for example of graphite mines, electrodes or the like in use.
  • furnaces to be operated in batches are used here, in which each furnace journey can be followed according to a precisely defined program, which is practically not possible with tunnel furnaces which have a high throughput.
  • the invention has set itself the task of creating an at least indirectly, in particular electrically, heated furnace, in which an exchange of gaseous medium between the interior of the furnace and the environment is completely avoidable, in which continuous gas supply e.g. to maintain a special, e.g. reductive atmosphere in the combustion chamber during the combustion process and thus large gas losses are switched off and with which improved energy efficiency is given.
  • the invention thus relates to a kiln of the type mentioned at the outset, which is characterized in that the combustion chamber, which is designed to be gas-tight, has a combustion chamber having at least one transfer line for fluid medium, at least gas-tight and gas-communicating, with at least one, preferably volumatically variable gas storage container is connected for expanding and / or released gaseous medium during the heating and burning process.
  • combustion chamber and / or transfer line has at least one connection for an environmentally exclusive supply of media influencing the combustion chamber atmosphere, for example small amounts of hydrocarbon for setting a reductive C / CO atmosphere in the furnace.
  • the storage container has at least one gas-tight, possibly with a cleaning device, discharge for gaseous medium, which can be activated in particular if the fuel to be burned is too large Free gas quantities.
  • the gas storage container has a liquid filling with a diving bell storage space which can be varied in its gas volume, for example in the manner of earlier town gas containers or the like.
  • a gas storage container with walls made of flexible and / or elastic material.
  • a container can also have a bellows, for example.
  • a batch-operated kiln with an oven hood which is characterized in that it has gas-sealable good introduction and discharge device, a thermal insulation or the like that essentially surrounds the combustion chamber , preferably hood-like, housing upper part, which in the operating state with its, preferably no thermal insulation, lower, preferably apron-like edge part completely below the liquid level of an open channel, which is filled with an optionally flammable medium and essentially corresponds to the circumferential profile of the edge part of a lower furnace part protrudes, the upper and / or lower part being essentially vertical, relatively movable and fixable in position.
  • the stove is gas-tight by dipping with the hood apron. It should be mentioned that, depending on the depth of immersion, small negative or positive pressures of the gas atmosphere can also be maintained.
  • the hood is slowly pulled up, where the apron still protrudes below the liquid level of the lower part of the furnace, and where gaseous medium flows from the storage container into the combustion chamber due to a reduction in gas volume without outside air being sucked in.
  • the apron is preferably formed from a material which is good at thermal conductivity, cooling of the material to be burned, which is uniformly effective throughout, is achieved, however, and thus improves economy.
  • the apron immediately after lifting the hood and to achieve even more effective cooling it is also particularly advantageous if it is preferably double-walled, optionally with baffles, for receiving as flowable cooling medium is formed.
  • the heat absorbed by the cooling medium can be used elsewhere in operation to save energy.
  • the kiln 100 shown in the two figures has a hood-like furnace upper part 12 which is equipped with thermal insulation 120 on the inside and which sits with the lower edge on the likewise insulated furnace bottom or furnace bottom part 2, this lower edge being provided with a cooling medium 60 via additions 7 and Derivation 8 has flowable apron 6.
  • Heating coils 9 are arranged above the bottom of the furnace base part and are used to heat the firing material 21 in the combustion chamber 22 which is located on set plates 10 with set supports 11.
  • a temperature sensor 13 also protrudes through opening 130. The wall penetration there can be used for adding materials that influence the furnace atmosphere.
  • the hood 12 is vertically movable via a roller guide 14 with a counterweight 15.
  • the apron 6 of the hood 12 protrudes with its lower edge during the firing process, FIG. 1, deeply into a diving channel 1, which at the same time forms the frame for the lower part 2 and can be flowed through by supply and discharge 5 of cooling medium 110, and it is therefore a leakproof gas exchange Separation of the furnace atmosphere from the outside world is given.
  • a gas transfer line 23 passes through from the lower furnace part 2 Flow regulating members 31, 32 and liquid separator 3, which penetrates a liquid immersion 160, which is guided via the inlet 17 and outlet 18, of a storage tank 16 which is closed at the top by an immersion bell 161 reaching with its edge below the liquid level, in the volume-adjustable gas storage space 19 of which during the burning process in Flows into furnace 100, expanding gases released from the material, lifting hood 161 held by rollers 14 'with counterweight 15'.
  • vessels can be provided in which liquid displacement takes place when the gas volume increases, or those with bellows and / or flexible walls.
  • the closed gas atmosphere can be circulated via a further transfer line 40 which has a circulating pump 41 and, if appropriate, an adsorption device 42 for substances which are harmful to quality. Also indicated is a gas discharge 50 with a gas cleaning device 51, in order to be able to carry out a harmless discharge into the atmosphere in the case of high gas volumes released from the material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Tunnel Furnaces (AREA)
EP85890087A 1984-04-09 1985-04-03 Four, en particulier, four électrique Withdrawn EP0162832A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1191/84 1984-04-09
AT119184 1984-04-09

Publications (1)

Publication Number Publication Date
EP0162832A1 true EP0162832A1 (fr) 1985-11-27

Family

ID=3508574

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85890087A Withdrawn EP0162832A1 (fr) 1984-04-09 1985-04-03 Four, en particulier, four électrique

Country Status (1)

Country Link
EP (1) EP0162832A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225952A1 (fr) * 1985-12-11 1987-06-24 Chui-Wen Chiu Etuve électrique domestique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR455019A (fr) * 1912-05-09 1913-07-21 Nicolas Koroleff Four électrique à résistance
GB262766A (en) * 1925-12-10 1927-05-05 Siemens Schuckertwerke Gmbh Means for drying electric bright annealing furnaces
FR2170749A5 (en) * 1972-02-05 1973-09-14 Joetsu Denro Kogyo Co Ltd Electric arc furnace flue gas removal installation - - having auxiliary chimney
DE2260665A1 (de) * 1972-12-12 1974-06-20 Ceag Dominit Ag Verfahren zur erfassung der abgase eines lichtbogen-ofens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR455019A (fr) * 1912-05-09 1913-07-21 Nicolas Koroleff Four électrique à résistance
GB262766A (en) * 1925-12-10 1927-05-05 Siemens Schuckertwerke Gmbh Means for drying electric bright annealing furnaces
FR2170749A5 (en) * 1972-02-05 1973-09-14 Joetsu Denro Kogyo Co Ltd Electric arc furnace flue gas removal installation - - having auxiliary chimney
DE2260665A1 (de) * 1972-12-12 1974-06-20 Ceag Dominit Ag Verfahren zur erfassung der abgase eines lichtbogen-ofens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225952A1 (fr) * 1985-12-11 1987-06-24 Chui-Wen Chiu Etuve électrique domestique

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR NL SE

17P Request for examination filed

Effective date: 19860428

17Q First examination report despatched

Effective date: 19870309

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19870721

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HAUSNER, JOSEF

Inventor name: BARTSCH, KARL, DIPL.-ING.

Inventor name: WAGNER, WALTER