EP0769125B1 - Procede de fusion d'une charge metallique dans un four rotatif et four rotatif pour la mise en uvre d'un tel procede - Google Patents

Procede de fusion d'une charge metallique dans un four rotatif et four rotatif pour la mise en uvre d'un tel procede Download PDF

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Publication number
EP0769125B1
EP0769125B1 EP95923393A EP95923393A EP0769125B1 EP 0769125 B1 EP0769125 B1 EP 0769125B1 EP 95923393 A EP95923393 A EP 95923393A EP 95923393 A EP95923393 A EP 95923393A EP 0769125 B1 EP0769125 B1 EP 0769125B1
Authority
EP
European Patent Office
Prior art keywords
oxygen
charge
burner
lance
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 - Lifetime
Application number
EP95923393A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0769125A1 (fr
Inventor
Joan Marles Franco
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing date
Publication date
Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP0769125A1 publication Critical patent/EP0769125A1/fr
Application granted granted Critical
Publication of EP0769125B1 publication Critical patent/EP0769125B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/08—Manufacture of cast-iron
    • 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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/2083—Arrangements for the melting of metals or the treatment of molten metals
    • 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

Definitions

  • the present invention relates to fusion methods metal charges in a rotary kiln equipped with minus an oxy-burner.
  • the oxy-burner regulated in stoichiometric conditions, ensures the fusion of the charge metallic possibly containing, and for purely metallurgical considerations, weak quantities of solid fuels, generally not exceeding not 1% of the metal charge to limit the formation of unwanted unburned volatile compounds which also level of implementation of the oxy-burner, limit the conditions under which combustion is carried out and, consequently, the rate of melting of the charge in the oven.
  • DE-A-4142301 discloses a process for the fusion of solid materials using an air burner or oxycombustible strongly under stoichiometric, process in which we add oxygen to the oven using spears.
  • the object of the present invention is to compose a improved process for increasing significant speed and efficiency of fusion in a donated oven while reducing energy consumption overall.
  • the method comprises the steps of adding to the metallic charge to melt a fuel charge solid between 1.5% and 9% of the weight of the metallic filler and inject at least one oxygen jet towards the combined charge in the oven.
  • the present invention also relates to an oven rotary for implementing such a method, comprising, in addition to an oxy-burner, at least one lance with oxygen arranged to direct at least one jet of oxygen to the bottom of the oven.
  • the combustion in the charge itself where the oxygen injected by the lance interacts with the solid fuel which burns in direct contact with metal, increasing extremely importantly the reaction surface and thereby promoting an accelerated merger without affecting the temperature conditions at the oven refractory and therefore not reducing the life of the latter.
  • a significant share, exceeding 35% of the energy total combustion, being ensured in the load, by solid fuel, the power of the burner, and therefore its cost, can be reduced significantly.
  • FIG 1 there is shown a rotary kiln 1 in the end door 4 of which are mounted a charge-oriented oxy-burner 5 and an oxygen lance 2 adjustable position thanks to a device guide 3.
  • the lance 2 is oriented so as to direct, in the furnace 1, a high oxygen jet speed, typically supersonic, towards a combined load of metal, typically steel, to be melted and a fuel solid in proportions typically greater than 2% of metallic charge.
  • This solid fuel is typically anthracite, graphite, in particular electrode, or other carbon-containing products and hydrogen, especially solid polyolefins.
  • an oxygen lance 2 comprising an upper main oxygen supply 7 and two lower oxygen leads 6 allowing ejection of differentiated oxygen jets in the direction of the charge and below the burner flame 5.
  • the lance body 2 has a groove 8a cooperating with a rib 8b of the guide device 3 for maintaining an orientation tubes 6 and 7 correctly when adjusting forwards or towards the rear of the lance 2 in the oven 1.
  • Figures 4 and 5 show an oxy-burner comprising a central supply 12 of combustible gas in a ferrule forming an oxygen channel 9a introduced by a inlet 9, the combustible gas being ejected by injectors 10 extending into outlet orifices oxygen in the burner nose, here angularly distributed around the axis of the burner.
  • the combined ejection ports oxygen / gaseous fuel are replaced by at least one lance 2 as described in relation to Figures 2 and 3 and the upstream part of which extends into the central supply of fuel 12.
  • the end of a central cooling circuit of the burner nose In 11 the end of a central cooling circuit of the burner nose.
  • Figures 6 and 7 show an oxy-burner cooled comprising a peripheral liner 11 of circulation of water introduced in 13 and evacuated in 14.
  • the burner includes a central fuel gas supply 12 extending into an oxygen ejection channel 9a and opening outwards through a series of ejectors 10, here angularly and regularly distributed.
  • at least one, in this case two oxygen lances 2 extend in the lower part of the main oxygen channel 9a and open to the outside of the burner below the ejectors 10.
  • oxygen main in channel 9a cooled by liner 11, participates in the cooling of the oxygen lances 2.
  • the oxygen lance is set to eject the oxygen jets into the direction towards the load at an angle between 5 and 25 ° with respect to the axis of the oven.
  • the flow of jets of oxygen ejected by the lance is chosen between 25 and 150% of the oxygen burner oxygen flow.
  • a second oxygen lance also directed towards the load, in the end of the oven opposite the burner.
  • Supply oxygen both from the lance and from the oxy-burner is advantageously oxygen at a purity between 88 and 95% supplied on site by a separation unit of gas from the air by adsorption of the so-called PSA type.
  • Solid fuel in proportions 3.2% of the steel load, in this case 5.3 tonnes approximately, is anthracite and the oxygen injected by the lance 2 is ejected at supersonic speed at an angle about 10 ° from the axis of the oven.
  • references 1 to 18 correspond to fusion processes without injection oxygen with reduced loads of anthracite
  • references 19 to 22 using injection of oxygen directed to a metal charge containing 1.5% anthracite increased to 3% in references 23 to 28.
  • Figure 8 which illustrates the melting rates in ° C / minute for a load of 5.3T for each of the references 1 to 29 of the preceding Tables, shows that the speed goes from above 15 to more than 20 for references 28 and 29, which makes it possible to reduce the time of discontinuous oven rotation from 55 minutes to 33 minutes and the break between rotations of 5 to 3 minutes.
  • Figure 9 which illustrates the consumption of propane (bottom curve) and oxygen (top curve) for each of the references 1 to 29, shows that the specific consumption of propane can drop to 4.6m 3 for a substantially stable oxygen consumption.
  • Figure 10 shows that the melting efficiency goes from just over 50% to over 60-65%.
  • Figure 11 shows that the energy consumption, in KWh can be reduced from around 700 KWh to less than 600 KWh.
  • Figure 12 shows that, according to references 1 to 29, the energy percentage in the load goes from less than 20 to over 40 with a corresponding increase in melting speed from 15 to 22 ° C / minute.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Gasification And Melting Of Waste (AREA)
EP95923393A 1994-06-16 1995-06-15 Procede de fusion d'une charge metallique dans un four rotatif et four rotatif pour la mise en uvre d'un tel procede Expired - Lifetime EP0769125B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ES9401366 1994-06-16
ES09401366A ES2114388B1 (es) 1994-06-16 1994-06-16 Procedimiento para la fusion de metales en hornos rotativos y horno de fusion rotativo para la aplicacion de este procedimiento.
PCT/FR1995/000791 WO1995034791A1 (fr) 1994-06-16 1995-06-15 Procede de fusion d'une charge metallique dans un four rotatif et four rotatif pour la mise en ×uvre d'un tel procede

Publications (2)

Publication Number Publication Date
EP0769125A1 EP0769125A1 (fr) 1997-04-23
EP0769125B1 true EP0769125B1 (fr) 1998-09-09

Family

ID=8286673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95923393A Expired - Lifetime EP0769125B1 (fr) 1994-06-16 1995-06-15 Procede de fusion d'une charge metallique dans un four rotatif et four rotatif pour la mise en uvre d'un tel procede

Country Status (14)

Country Link
US (1) US6039786A (zh)
EP (1) EP0769125B1 (zh)
JP (1) JPH10501610A (zh)
KR (1) KR100370632B1 (zh)
CN (1) CN1150837A (zh)
AT (1) ATE170970T1 (zh)
AU (1) AU691628B2 (zh)
BR (1) BR9508013A (zh)
CA (1) CA2192953A1 (zh)
DE (1) DE69504680T2 (zh)
DK (1) DK0769125T3 (zh)
ES (2) ES2114388B1 (zh)
TW (1) TW257793B (zh)
WO (1) WO1995034791A1 (zh)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0982407B1 (de) * 1998-08-24 2003-01-22 Alstom Verfahren zum Schmelzen von anorganischen Stoffen
EP2080973A1 (en) 2008-01-10 2009-07-22 L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Rotary furnaces
DE102008047489B4 (de) * 2008-09-17 2010-05-12 Messer Group Gmbh Brenner und Verfahren zum Betreiben eines Brenners
US8632621B2 (en) * 2010-07-12 2014-01-21 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method for melting a solid charge
US8262983B2 (en) 2010-08-05 2012-09-11 Altek, L.L.C. Tilting rotary furnace system and methods of aluminum recovery
US8915733B2 (en) * 2010-11-11 2014-12-23 Air Products And Chemicals, Inc. Selective adjustment of heat flux for increased uniformity of heating a charge material in a tilt rotary furnace
EP2626628B1 (de) * 2012-02-09 2014-04-09 Linde Aktiengesellschaft Befeuerung eines Industrieofens und zugehöriger Brenner
PT2904341T (pt) * 2012-10-08 2019-01-22 Air Liquide Deutschland Gmbh Processo e dispositivo destinados a melhorar a combustão do combustível secundário num forno rotativo e processo para renovar um forno rotativo com um queimador
CN103090665B (zh) * 2012-11-30 2014-10-15 沈光林 用于回转窑的局部增氧助燃装置
CN103175394A (zh) * 2013-03-01 2013-06-26 大连易世达新能源发展股份有限公司 用于水泥窑节能减排的局部增氧助燃装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB952507A (en) * 1961-07-07 1964-03-18 British Oxygen Co Ltd Process for the treatment of metal and jet for use therein
FR1442523A (fr) * 1965-05-07 1966-06-17 Soc Metallurgique Imphy Four tournant pour l'obtention continue de fonte, d'acier ou de fer liquide
US4414026A (en) * 1981-07-30 1983-11-08 Nippon Kokan Kabushiki Kaisha Method for the production of ferrochromium
DE3518555C1 (de) * 1985-05-23 1986-01-09 Fried. Krupp Gmbh, 4300 Essen Verfahren zur Reduktion von eisenhaltigen Chromerzen
US4865297A (en) * 1986-11-21 1989-09-12 Gitman Grigory M Apparatus for melting and refining metals
US5123364A (en) * 1989-11-08 1992-06-23 American Combustion, Inc. Method and apparatus for co-processing hazardous wastes
US5163997A (en) * 1991-02-08 1992-11-17 Sherwood William L High-production rotary furnace steelmaking
DE4142401C2 (de) * 1991-12-20 1999-01-21 Linde Ag Verfahren zum Betrieb einer auf einem oder mehreren Brennern basierenden Beheizung eines Ofens
DE4202827A1 (de) * 1992-01-31 1993-08-05 Linde Ag Geregelter betrieb von industrieoefen
FR2694802B1 (fr) * 1992-08-12 1994-09-16 Air Liquide Four de maintien en température d'une charge métallique fondue et procédé de mise en Óoeuvre.
US5714113A (en) * 1994-08-29 1998-02-03 American Combustion, Inc. Apparatus for electric steelmaking

Also Published As

Publication number Publication date
US6039786A (en) 2000-03-21
DE69504680D1 (de) 1998-10-15
AU691628B2 (en) 1998-05-21
ES2120755T3 (es) 1998-11-01
TW257793B (en) 1995-09-21
ES2114388B1 (es) 1998-12-16
JPH10501610A (ja) 1998-02-10
ES2114388A1 (es) 1998-05-16
ATE170970T1 (de) 1998-09-15
CN1150837A (zh) 1997-05-28
WO1995034791A1 (fr) 1995-12-21
CA2192953A1 (fr) 1995-12-21
BR9508013A (pt) 1997-09-02
AU2796395A (en) 1996-01-05
EP0769125A1 (fr) 1997-04-23
KR100370632B1 (ko) 2003-04-11
DK0769125T3 (da) 1999-03-01
DE69504680T2 (de) 1999-03-18

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