EP0493994A1 - Dispositif d'allumage d'un lit de mélange de matériaux tels que du minerai et du coke - Google Patents

Dispositif d'allumage d'un lit de mélange de matériaux tels que du minerai et du coke Download PDF

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Publication number
EP0493994A1
EP0493994A1 EP91403348A EP91403348A EP0493994A1 EP 0493994 A1 EP0493994 A1 EP 0493994A1 EP 91403348 A EP91403348 A EP 91403348A EP 91403348 A EP91403348 A EP 91403348A EP 0493994 A1 EP0493994 A1 EP 0493994A1
Authority
EP
European Patent Office
Prior art keywords
burners
mixing bed
bed
mixture
hood
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Withdrawn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
EP91403348A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Claude Dieuloufet
Gérard Griffay
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0493994A1 publication Critical patent/EP0493994A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast 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
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines

Definitions

  • the present invention relates to a device for igniting a bed of mixture driven in movement, in particular a mixture comprising ore and coke, the combustion of which produces agglomeration of the ore.
  • the ore transformation process in the steel industry notably includes a stage of agglomeration of iron ore which mainly consists of pre-baking it before loading it into a blast furnace.
  • This precooking is obtained by combustion of a mixture mainly containing ore and coke.
  • the mixture is driven in movement towards a grinder then, towards the blast furnace.
  • the combustion reaction of the mixture is sufficiently exothermic that once initialized when the mixture is ignited, it maintains itself by means of a suitable oxygen supply.
  • An ignition device commonly called an ignition hood, is placed upstream of the ignition chain and initiates the combustion reaction on the surface of the mixing bed. The combustion then propagates in the thickness of the mixing bed as it moves, so that before reaching the mill, the complete agglomeration of the ore is carried out.
  • the ignition hood heats the mixing bed by radiating the walls over its entire width and passing through, the surface of the mixing bed gradually reaches the combustion temperature.
  • a burner flame does not have a homogeneous temperature over its entire length and as two burner flames arranged opposite each side of the mixing bed, overlap in the center of the mixing bed, the temperature of the surface thereof is heterogeneous according to its width.
  • any irregularities in thickness of the mixing bed also lead to a poor distribution of the temperature on the surface of the mixing bed.
  • the ignition is accelerated and the combustion reaction is propagated by circulating air perpendicular to the surface of the mixing bed, the oxygen in the air thus supplying the combustion reaction.
  • the ignition device ensuring in particular the evaporation of the water from the mixture, it creates spaces in the mixture allowing the circulation of air.
  • Too high a temperature of the mixture causes its vitrification and the loss of its air permeability, preventing this air circulation.
  • too low a temperature of the mixture does not make it possible to obtain agglomeration of the ore. It is therefore important to obtain a uniform and well-controlled temperature over a defined thickness, which the known device does not achieve.
  • the circulation of the hot gases which is perpendicular to the surface of the mixing bed is in opposition to the movement of ejection of the gases from the burners which takes place parallel to the surface of the mixing bed. In this way, the gas flows from the burners through the mixture are heterogeneous.
  • the invention proposes an ignition device d '' a bed of mixture driven in movement, in particular of a mixture comprising iron ore and coke, the combustion of which produces the agglomeration of the ore, of the type comprising a hood, under which are burners supplied with fuel and air , the hood covering the mixing bed over its entire width and over a length suitable for heating it to the ignition temperature, the burners having axes oriented substantially perpendicular to the surface of the mixing bed, characterized in that that the fuel flow and the air flow are adjustable separately and individually for each burner.
  • FIG. 1 shows an ignition device 10 for a mixing bed 12 which moves in the direction indicated by the arrows F1 while being carried by a conveyor 13.
  • the mixture mainly comprises iron ore, coke, the combustion of which provides the heat energy necessary for the agglomeration of the ore, water and lime.
  • the mixing bed 12 has, for example, a width of 5 meters, a thickness of 0.5 to 0.7 meters and a length of 80 meters, between the ignition device 10 and the grinder, in relation to time propagation of the combustion reaction in the thickness of the mixture.
  • the ignition device 10 comprises a hood 14.
  • the hood comprises at least one row of burners 16 having axes oriented substantially perpendicular to the surface of the mixing bed 12.
  • Each burner 16 comprises a body 17, a gas supply duct 18 and an air supply duct, not shown in the figures for reasons of clarity.
  • a hot gas ejection cone 19 is shown diagrammatically by two dashed lines under each burner body.
  • these burners 16 are arranged in a line in three equidistant rows spaced at most one meter apart, extending over the entire width of the mixing bed 12, one burner per row being shown.
  • Burners are preferably used with a rapid gas ejection speed, that is to say greater than 80 m / s.
  • each row of burners has twenty burners of the type described above, which makes a total of sixty burners arranged under the hood.
  • the hood 14 is made, for example, of refractory material.
  • the ignition device 10 and the mixing bed 12 are carried by a masonry structure 21.
  • FIG. 2 illustrates the way in which the combustion reaction, which was initiated by the ignition device 10 on the surface of the mixing bed 12, propagates along the thickness of the latter, as it moves towards the crusher.
  • a first zone 22 corresponds to the part of the mixture in combustion
  • a second zone 24 corresponds to the agglomerate of ore obtained after the combustion of the mixture
  • a third zone 26 corresponds to the mixture not yet reacted.
  • FIG. 2 shows a start of propagation of the combustion reaction which has been initialized on the surface of the mixing bed 12, at the outlet of the ignition device.
  • FIG. 2 shows that the combustion reaction has reached the underside of the mixing bed and that the mixture has been transformed into agglomerated ore intended to supply the blast furnace.
  • combustion takes place optimally, for example, for a temperature between 1100 ° and 1250 °.
  • the device according to the invention makes it possible in particular to control the homogeneity of the ignition temperature on such a strip.
  • each burner essentially heats a sector of the surface of the mixing bed 12 delimited by the gas ejection cone and all of the burners heats as many sectors as necessary to bring the mixture to its temperature d on the entire width of the bed.
  • the individual adjustment of the gas flow rate of each burner 16 allows temperature control, sector by sector, and thus makes it possible to obtain a relatively uniform temperature at the surface of the mixing bed 12.
  • this possibility of individual adjustment makes it possible to adapt the heating to a mixing bed whose cross section has a variable thickness, for example in the case of a V-shaped section such that the mixing bed is thicker. in the center only on its edges, or vice versa.
  • the ejection of combustion products and the circulation of hot gases through the mixing bed are in the same direction, so there is no disturbance and thus optimizes the consumption of oxygen and gas on the burners . This ensures a uniform temperature of the gases entering the mixing bed.
  • burners 16 of the fast gas ejection speed type better control of the heat and gas flows is provided by the rapid ejection of the gases which causes the recirculation of the fumes and the constitution under the hood d '' a homogeneous hot zone.
  • the better control of heat and gas flows provided by the ignition device according to the invention reduces the length of the hood by up to 50% or more. Indeed, the ignition of the mixing bed is obtained more quickly in the case of a device according to the invention than in the case of the known device described at the start, at the same speed of movement of the mixing bed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP91403348A 1990-12-20 1991-12-10 Dispositif d'allumage d'un lit de mélange de matériaux tels que du minerai et du coke Withdrawn EP0493994A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9016034 1990-12-20
FR909016034A FR2670801B1 (fr) 1990-12-20 1990-12-20 Dispositif d'allumage d'un lit de melange de materiaux tels que du minerai et du coke.

Publications (1)

Publication Number Publication Date
EP0493994A1 true EP0493994A1 (fr) 1992-07-08

Family

ID=9403484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91403348A Withdrawn EP0493994A1 (fr) 1990-12-20 1991-12-10 Dispositif d'allumage d'un lit de mélange de matériaux tels que du minerai et du coke

Country Status (11)

Country Link
US (1) US5257804A (bg)
EP (1) EP0493994A1 (bg)
KR (1) KR920012462A (bg)
CN (1) CN1063717A (bg)
BG (1) BG95660A (bg)
BR (1) BR9105475A (bg)
CS (1) CS392391A3 (bg)
FR (1) FR2670801B1 (bg)
HU (1) HU210661B (bg)
PL (1) PL292841A1 (bg)
YU (1) YU47817B (bg)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA008155B1 (ru) * 2004-08-12 2007-04-27 Общество С Ограниченной Ответственностью Научно-Производственная Фирма "Горелочный Центр" Способ зажигания агломерационной шихты, перемещающейся на спекательных тележках

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2009323283B2 (en) * 2008-12-03 2013-03-07 Jfe Steel Corporation Method for producing sintered ore and sintering machine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR482875A (fr) * 1916-09-13 1917-05-02 Metallurg Company Of America Perfectionnements apportés aux fours à ignition pour appareils de grillage
FR1274487A (fr) * 1960-08-10 1961-10-27 Basse Sambre Sa Etudes Rech S Dispositif de chauffage pour appareils d'agglomération de minerais
FR1397409A (fr) * 1964-03-18 1965-04-30 Penarroya Miniere Metall Procédé de grillage ou d'agglomération des concentrés sulfurés et fours renversables pour la mise en oeuvre dudit procédé
US3779077A (en) * 1972-04-10 1973-12-18 Siderurgie Fse Inst Rech Method and apparatus for establishing the firing temperature curve of a sintering charge
FR2347445A1 (fr) * 1976-04-09 1977-11-04 Sacilor Procede et installation d'allumage des chaines d'agglomeration
EP0036609A1 (de) * 1980-03-21 1981-09-30 Ruhrgas Aktiengesellschaft Verfahren und Vorrichtung zum Zünden eines Sintergemisches
EP0126948A1 (en) * 1983-04-28 1984-12-05 Kawasaki Steel Corporation Burner for sintering machine
EP0221797A1 (fr) * 1985-09-30 1987-05-13 Stein Heurtey Procédé d'allumage d'un lit de minerai en vue de son agglomération

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR482875A (fr) * 1916-09-13 1917-05-02 Metallurg Company Of America Perfectionnements apportés aux fours à ignition pour appareils de grillage
FR1274487A (fr) * 1960-08-10 1961-10-27 Basse Sambre Sa Etudes Rech S Dispositif de chauffage pour appareils d'agglomération de minerais
FR1397409A (fr) * 1964-03-18 1965-04-30 Penarroya Miniere Metall Procédé de grillage ou d'agglomération des concentrés sulfurés et fours renversables pour la mise en oeuvre dudit procédé
US3779077A (en) * 1972-04-10 1973-12-18 Siderurgie Fse Inst Rech Method and apparatus for establishing the firing temperature curve of a sintering charge
FR2347445A1 (fr) * 1976-04-09 1977-11-04 Sacilor Procede et installation d'allumage des chaines d'agglomeration
EP0036609A1 (de) * 1980-03-21 1981-09-30 Ruhrgas Aktiengesellschaft Verfahren und Vorrichtung zum Zünden eines Sintergemisches
EP0126948A1 (en) * 1983-04-28 1984-12-05 Kawasaki Steel Corporation Burner for sintering machine
EP0221797A1 (fr) * 1985-09-30 1987-05-13 Stein Heurtey Procédé d'allumage d'un lit de minerai en vue de son agglomération

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA008155B1 (ru) * 2004-08-12 2007-04-27 Общество С Ограниченной Ответственностью Научно-Производственная Фирма "Горелочный Центр" Способ зажигания агломерационной шихты, перемещающейся на спекательных тележках

Also Published As

Publication number Publication date
HUT61841A (en) 1993-03-01
YU195191A (sh) 1994-01-20
KR920012462A (ko) 1992-07-27
PL292841A1 (en) 1992-11-16
CN1063717A (zh) 1992-08-19
HU914034D0 (en) 1992-03-30
HU210661B (en) 1995-06-28
FR2670801A1 (fr) 1992-06-26
FR2670801B1 (fr) 1994-07-01
BR9105475A (pt) 1992-09-01
YU47817B (sr) 1996-01-09
BG95660A (bg) 1993-12-24
US5257804A (en) 1993-11-02
CS392391A3 (en) 1992-07-15

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