EP0187592B1 - Verfahren und Vorrichtung zur Leichtmetallschmelzung - Google Patents

Verfahren und Vorrichtung zur Leichtmetallschmelzung Download PDF

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Publication number
EP0187592B1
EP0187592B1 EP85402533A EP85402533A EP0187592B1 EP 0187592 B1 EP0187592 B1 EP 0187592B1 EP 85402533 A EP85402533 A EP 85402533A EP 85402533 A EP85402533 A EP 85402533A EP 0187592 B1 EP0187592 B1 EP 0187592B1
Authority
EP
European Patent Office
Prior art keywords
chamber
burner
holding
combustion
furnace
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
EP85402533A
Other languages
English (en)
French (fr)
Other versions
EP0187592A1 (de
Inventor
Raymond Louis
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.)
Engie SA
Original Assignee
Gaz de France 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 Gaz de France SA filed Critical Gaz de France SA
Priority to AT85402533T priority Critical patent/ATE40742T1/de
Publication of EP0187592A1 publication Critical patent/EP0187592A1/de
Application granted granted Critical
Publication of EP0187592B1 publication Critical patent/EP0187592B1/de
Expired 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
    • F27B3/04—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
    • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
    • F27B3/26—Arrangements of heat-exchange apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S266/00—Metallurgical apparatus
    • Y10S266/90—Metal melting furnaces, e.g. cupola type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S266/00—Metallurgical apparatus
    • Y10S266/901—Scrap metal preheating or melting

Definitions

  • the subject of the invention is a method and a device for melting and maintaining fusion of charges of light metal alloys.
  • Ovens are known in the art comprising a loading chamber in which the melting of a light metal charge takes place, the loading chamber communicating with a chamber placed at a lower level in which the keeping in fusion of the bath and racking. These ovens are used in particular for the fusion of light metals and the casting of new parts.
  • the subject of the invention is a method and a device for the improved melting of charges of light metal alloys.
  • the oven constructed according to the invention is in particular of improved compactness and thermal efficiency compared to known similar devices.
  • the process according to the invention for melting and maintaining fusion of charges of light metal alloys is of the type using an oven comprising a first loading chamber placed at a higher level in which the fusion takes place, communicating by a passage forming a channel with a second chamber placed at a lower level in which the bath is kept in fusion and its drawing off, each chamber comprising an independent burner and the oven comprising a common chimney for evacuating combustion fumes after those produced in the second chamber have penetrated, through said communiction passage, into the first chamber and have mixed with the combustion fumes produced in this first chamber.
  • the method is characterized in that it is carried out in the furnace, at the bottom of the first chamber and preferably under the bottom of this first chamber where the flue gases leaving the combustion chamber emerge before their evacuation. from this same chamber, a heat exchange between said combustion fumes and the combustion air used for at least one of the burners.
  • a particularly compact construction is obtained, as well as a significantly improved thermal efficiency, due to the heat exchange with the combustion products from the two burners, before their exhaust to the chimney.
  • a maximum heating efficiency of the charge to be melted is obtained and the process of melting the charge which is entirely placed in the heat flow directed in the axial plane of the chamber is accelerated.
  • the holding burner is placed in said lower retaining and withdrawing chamber towards the ceiling of said chamber, said burner being of the flat flame type.
  • said burner being of the flat flame type.
  • the invention also relates to a device for implementing the aforementioned method, characterized in that said oven comprises two adjacent chambers, one of which is disposed at a level higher than the other, respectively forming an upper loading-melting chamber and lower holding-withdrawal chamber, and a heat exchanger between the combustion air and the combustion fumes, placed substantially under the bottom of the upper chamber and next to the internal side wall of the lower chamber.
  • the device shown as a whole 1 essentially comprises an upper loading-melting chamber 2 communicating through a narrow passage in the form of a channel 4 with a lower retaining-drawing-off chamber 3. Below the chamber upper 2 is formed a volume 5 of smoke circulation in which is mounted a heat recovery heat exchanger 6 in "thimble".
  • the holding-racking chamber 3 communicates outside with two lateral augets 7 of drawing.
  • a gas burner 8 is provided, placed substantially at one end of the chamber 2 in the median axis of this chamber.
  • the burner heats the charge 9 over its entire length, and more towards its end close to the burner which is also close to the channel 4 for communication with the lower chamber 3.
  • the chamber 3 for keeping the bath in fusion is heated by a burner 10 of the radiant flat flame type 11 mounted towards the ceiling of said chamber 3, as it is clearly shown in FIG. 2.
  • the combustion products from the lower chamber 3 pass through the channel 4, enter the loading chamber 2 where they mix languish with the products of combustion produced by the burner 8.
  • the products of combustion in chamber 2 first rise from the bottom of the chamber to be sucked towards the upper part by a reverse circuit duct 12 communicating with volume 5 formed under the bottom of chamber 2 and against the side wall of chamber 3. They exit at the other end of volume 5 via the chimney duct 13 communicating with volume 5 by an opening 14.
  • the heat recovery device 6 as a thermowell is formed by an internal duct 15 into which cold air is admitted at 16 and which is housed inside a slightly longer and larger diameter duct 17 which l 'surrounded.
  • the hot air is brought through a pipe 18 to the burner 8, and also advantageously to the burner 10, so that the combustion air is preheated in exchange for heat with the products of combustion before they escape to the chimney.
  • the construction is particularly compact, and the compactness is used to reduce heat loss to the outside and improve the efficiency of the recuperator 5, 6. It can be seen in FIG. 3 that the volume 5 is adjacent to the median vertical plane 19 of the construction on which the passage 4 is located.
  • the bottom of the chamber 3 and the bottom of the volume 5 are in the same plane and form the support sole of the entire device.
  • the cover 30 is moved horizontally which simply comes to rest on the loading chamber 2, and the cover is replaced before the installation is started up.
  • the slightly inclined bottom 21 of the chamber 2 guides the fusion products to the channel 4 of reduced section communicating with the chamber 3, which prevents unmelted metallic charges falling into the chamber 3.
  • the buckets 7 are normally closed by a cover (not shown) which limits heat loss and slows down oxidation. The cover is removed when you want to draw molten charge.
  • the charge was melted in 45 minutes.
  • the combustion efficiency of the burners was 72%, and the heating efficiency of 55%.
  • the implementation of the device is done as follows.
  • the metal to be melted, in the form of ingots, returns and the like, is loaded into chamber 2 from which the cover 20 has been removed. After replacing the cover, the burner 8 is lit. The metal melts, preheats and flows in the vicinity of its liquefaction temperature towards the holding chamber 3.
  • the combustion products having served to melt and preheat the charge circulate in the volume 5 before leaving through the chimney 13 and therefore ensure the preheating of the combustion air of the burner.
  • a new charge is introduced into the melting cell 2.
  • the burner 8 is not lit and only the burner 10, now in operation, is operated. the bath 22.
  • the combustion products from chamber 3 escape through chamber 2 then through volume 5 and finally to the chimney, serving to preheat the charge to melt and also the combustion air in the exchanger- recuperator 6.
  • the burner is only lit if the level of bath 22 drops too low.
  • the modules constituting the three juxtaposed volumes of the chamber 2, of the chamber 3 and of the volume 5 are advantageously formed of a refractory concrete with surrounding of a steel wall.
  • the cover 20 can be made of fibrous refractory material for sealing reasons.
  • L 2.85 m
  • width 1 2 m
  • height (cover removed) h 1.30 m.
  • the dimensions of the installation can be increased if it is desired to increase the capacity of the unit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)

Claims (9)

1. Verfahren zur Schmelzung und zur Aufrechterhaltung des Schmelzzustandes von Legierungschargen von Leichtmetallen unter Verwendung eines Ofens mit einer ersten Beschickungskammer (2), die auf einem höheren Niveau angeordnet ist und in welcher die Schmelzung erfolgt, und die über einen Durchgang (4), der einen Abzug bildet, mit einer zweiten Kammer (3) in Verbindung steht, die auf einem tieferen Niveau angeordnet ist und in welcher die Schmelze in ihrem Schmelzzustand aufrechterhalten wird und aus welcher der Abstich erfolgt, wobei jede Kammer einen unabhängigen Brenner und der Ofen einen gemeinsamen Kamin (13) aufweist zum Abzug der Verbrennungsgase, nachdem die in der zweiten Kammer (3) erzeugten durch den Verbindungsdurchgang (4) in die erste Kammer (2) eingetreten sind und sich mit den Verbrennungsgasen vermischt haben, die in dieser ersten Kammer erzeugt wurden, dadurch gekennzeichnet, daß man in dem Ofen in Höhe des Bodens der ersten Kammer und vorzugsweise unter dem Boden dieser ersten Kammer, wo vor ihrem Abzug in den Kamin die Verbrennungsgase aus dieser zweiten Kammer (2) austreten, einen Wärmeaustausch zwischen den Verbrennungsgasen und der Verbrennungsluft bewirkt, die für wenigstens einen der Brenner verwendet wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man eine vollständige Beschickung der ersten oberen Kammer (2) mit den zu schmelzenden Produkten vorsieht, daß man den Brenner (8) in der Beschickungskammer etwa an einem axialen Ende der Kammer anordnet und der Brenner zu dem anderen Ende hin gerichtet ist, und daß man an einem Punkt unter der Beschickungskammer nur einen Verbindungsdurchgang (4) mit verringertem Querschnitt mit der unteren Kammer (3) vorsieht.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß man den Durchgang (4) zu dem Ende hin vorsieht, wo der Brenner (8) angeordnet ist.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß man in der unteren Kammer (3) zum Aufrechterhalten des Schmelzzustandes und zum Abstich den Brenner (10) zum Aufrechterhalten des Schmelzzustandes gegen die Decke der Kammer anordnet und daß der Brenner vom Typ mit einer ebenen Strahlungsflamme ist.
5. Vorrichtung zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Ofen zwei benachbarte Kammern, von denen eine auf einem höheren Niveau angeordnet ist als die andere und die eine obere Beschickungs- und Schmelzkammer (2) und eine untere Schmelzhalte- und Abstichkammer (3) bilden, und einen Wärmetauscher (6) zwischen der Verbrennungsluft und den Verbrennungsgasen aufweist, der etwa unter dem Boden der oberen Kammer (2) und neben der inneren Seitenwand der unteren Kammer (3) angeordnet ist.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Tauscher (6) vom Fingerlingtyp ist und in einem Zirkulationsraum (5) für die Abgase angeordnet ist, der den Ausgang der oberen Kammer (2) mit der Abzugsleitung (13) für die Abgase verbindet.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Kammern in Vertikalrichtung zueinander versetzt sind und daß der Durchgang (4), der die beiden Kammern (2, 3) verbindet, sich etwa rittlings auf einer gemeinsamen vertikalen Verbindungsebene (19) der beiden Kammern befindet.
8. Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Bodenplatte des Ofens, die etwa eben ist, den Boden der unteren Kammer (3) und den Boden des Raumes (5) aufweist, in welchem der Tauscher (6) vom Fingerlingtyp angeordnet ist.
9. Vorrichtung nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, daß die untere Kammer (3) wie an sich bekannt über eine oder zwei seitliche Tröge (7) mit der Außenseite in Verbindung steht.
EP85402533A 1984-12-20 1985-12-18 Verfahren und Vorrichtung zur Leichtmetallschmelzung Expired EP0187592B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85402533T ATE40742T1 (de) 1984-12-20 1985-12-18 Verfahren und vorrichtung zur leichtmetallschmelzung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8419543 1984-12-20
FR8419543A FR2575278B1 (fr) 1984-12-20 1984-12-20 Procede et dispositif pour la fusion de metaux legers

Publications (2)

Publication Number Publication Date
EP0187592A1 EP0187592A1 (de) 1986-07-16
EP0187592B1 true EP0187592B1 (de) 1989-02-08

Family

ID=9310827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85402533A Expired EP0187592B1 (de) 1984-12-20 1985-12-18 Verfahren und Vorrichtung zur Leichtmetallschmelzung

Country Status (8)

Country Link
US (1) US4712774A (de)
EP (1) EP0187592B1 (de)
JP (1) JPH0633948B2 (de)
AT (1) ATE40742T1 (de)
CA (1) CA1258377A (de)
DE (1) DE3568217D1 (de)
ES (1) ES8702636A1 (de)
FR (1) FR2575278B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH033572Y2 (de) * 1986-10-17 1991-01-30
JPH06309557A (ja) * 1993-04-22 1994-11-04 Towa Metsukusu Kk 電子式金銭登録機およびバーコード表
US6113670A (en) * 1998-04-03 2000-09-05 Thermtronix Corporation Twin chamber combustion furnace
RU2280829C1 (ru) * 2004-12-08 2006-07-27 ОАО "Кукморский завод Металлопосуды" Алюминеплавильная печь
ES2272151B1 (es) 2005-02-07 2008-02-01 Luis Angel Moreno Garcia Columna telescopica para postes de alumbrado.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752235A (en) * 1952-05-27 1956-06-26 Ethel M Burke Method and apparatus for making steel
US3276758A (en) * 1963-04-24 1966-10-04 North American Aviation Inc Metal melting furnace system
US3186830A (en) * 1963-05-20 1965-06-01 William H Moore Melting process
US4010935A (en) * 1975-12-22 1977-03-08 Alumax Inc. High efficiency aluminum scrap melter and process therefor
US4021192A (en) * 1975-12-22 1977-05-03 Reynolds Metals Company Furnace system for and method of melting and preheating metal
CA1207143A (en) * 1982-01-21 1986-07-08 Roy Fisher Metal melting furnace

Also Published As

Publication number Publication date
JPS61184386A (ja) 1986-08-18
CA1258377A (fr) 1989-08-15
DE3568217D1 (en) 1989-03-16
ES550217A0 (es) 1987-01-01
US4712774A (en) 1987-12-15
FR2575278B1 (fr) 1987-02-06
EP0187592A1 (de) 1986-07-16
ES8702636A1 (es) 1987-01-01
ATE40742T1 (de) 1989-02-15
FR2575278A1 (fr) 1986-06-27
JPH0633948B2 (ja) 1994-05-02

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