EP1629125A1 - Melange de combustible destine a etre introduit dans des tuyeres pour la production de fonte brute en haut fourneau et procede et installation de production et d'introduction dudit melange combustible - Google Patents

Melange de combustible destine a etre introduit dans des tuyeres pour la production de fonte brute en haut fourneau et procede et installation de production et d'introduction dudit melange combustible

Info

Publication number
EP1629125A1
EP1629125A1 EP04729879A EP04729879A EP1629125A1 EP 1629125 A1 EP1629125 A1 EP 1629125A1 EP 04729879 A EP04729879 A EP 04729879A EP 04729879 A EP04729879 A EP 04729879A EP 1629125 A1 EP1629125 A1 EP 1629125A1
Authority
EP
European Patent Office
Prior art keywords
fuel
mixture
scale
mill
coal
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
EP04729879A
Other languages
German (de)
English (en)
Other versions
EP1629125B1 (fr
Inventor
Holger Wulfert
Rongshan Lin
Walter Hartig
Horst Zewe
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.)
Loesche GmbH
Original Assignee
Loesche GmbH
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 Loesche GmbH filed Critical Loesche GmbH
Priority to PL04729879T priority Critical patent/PL1629125T3/pl
Publication of EP1629125A1 publication Critical patent/EP1629125A1/fr
Application granted granted Critical
Publication of EP1629125B1 publication Critical patent/EP1629125B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal

Definitions

  • the invention relates to a fuel system for supplying blow molding in pig iron production in the blast furnace according to the preamble of claim 1, a method for producing and supplying the fuel system according to the preamble of claim 8 and a plant for producing and supplying the fuel system according to the preamble of claim 18 ,
  • WO 99/64636 describes a process in which pulverized coal prepared with a catalyst additive is blown in.
  • the invention has for its object to provide a fuel system for feeding via the blow molding of a blast furnace and a method and a system for producing and supplying the fuel system, which in an extremely efficient production and supply of the fuel system to an improved fire behavior and optimized blast furnace process to lead.
  • the object is achieved by the features of claim 1, procedurally the object is solved by the features of claim 8 and according to the device by the features of claim 18.
  • the invention is based on the idea of using a mixture of at least one carbon carrier and a prereduced iron material as the fuel system and feeding it together with the hot blast and / or oxygen through the wind or blow molds to the blast furnace, for example according to the PCI process.
  • carbon carriers which can also be referred to as reducing agents
  • solid, liquid and gaseous carbon carriers and their suspensions are generally suitable.
  • solid carbon carriers coal, for example hard coal, but also lignite, granulated coal, coal mixtures, coal coke mixtures and plastics, for example as plastic-carbon mixtures or plastic-oil suspensions, as a liquid carbon carrier oil and gaseous carbon carriers such as natural gas used and together with a prereduced iron material in a predetermined grain size in blow molds are fed to the blast furnace.
  • a fuel system which contains a solid carbon carrier, e.g. Coal or a mixture of coal and petrol coke, and as a prereduced iron material, a scale material, e.g. Mill scale, contains.
  • a solid carbon carrier e.g. Coal or a mixture of coal and petrol coke
  • a scale material e.g. Mill scale
  • a common grinding process suitably a grinding-drying, subjected and with a predetermined grain size can be supplied to the blow molds.
  • the carbon carriers or the fuel raw material and the scale material can be ground separately in a suitable mill or grinding system and fed together in a particularly adjustable mixing ratio or else separately to the blow molding of the blast furnace.
  • a particularly adjustable mixing ratio or else separately to the blow molding of the blast furnace.
  • particularly rational and preferred is a common meal-viewing process, e.g. in an airflow roller mill.
  • coal dust-scale mixture in which the proportion of scale can be between about 0.5% and 55%, advantageously between 3 and 15%, and which extremely efficient and efficient grinding, leading to a significantly improved combustion behavior in the blast furnace and can also lead to a reduced incidence of unburned coal.
  • scale is an iron (II, III) oxide formed on a steel surface during hot forming and heat treatment
  • 2 5 comprises TiO, Zn, Zr, Cu, Cr, Co, V, Ni and Pb, and
  • the iron content in the mill scale can be between 30 and 80%, which is why it makes sense from the point of view of economic efficiency and also from an environmental point of view. So far, a recovery in the form of pelleted or briquetted mill scale, which is given together with the blast furnace coke and Möller over the Gicht- closure a blast furnace. However, a disadvantage is the need for pelleting or briquetting, which requires additional process steps.
  • a carbon carrier in particular a solid carbon carrier, or a mixture of two or more carbon carriers and a prereduced iron-containing material are fed to a mill and ground together and with a predetermined grain size according to the PCI method fed via blow molding a blast furnace.
  • a roller mill Give up with a built-in classifier in a predeterminable mixing ratio and subjected to a grinding-visual process.
  • a fuel raw material or mixture with a calorific value> 3000 kcal / kg, a moisture content of about 15% and a feed particle size of ⁇ 10 to about 80 mm.
  • the mill scale can be conveyed separately from the fuel raw material to the mill task and mixed with the fuel aterial or the fuel particles in the mill.
  • a mixing device for example a mixed bed or a mixing drum, upstream of the coal mill and feed the fuel raw material with the scale material as a feed mixture, and to mix the fine material mixture after the classifier in a filter to separate and as blow-ready fuel system to supply the blow molding of the blast furnace.
  • a hot gas e.g. Flue gas
  • a hot gas generator which is brought in a hot gas generator to the required temperature
  • the feed mixture is deprived of moisture and carried out a grinding-drying.
  • the grinding can also be carried out in an air-driven grinding plant with hot air as drying gas.
  • Another possibility for supplying hot gases for the grinding-drying process is the use of waste-gas or Cowpergas.
  • the mill scale can occur during a mechanical descaling with a hydraulic cleaning process or during rolling and transport processes by abrasion.
  • the scale has a high moisture content (up to 90%) and is contaminated with lubricating oils and greases from the rolling processes.
  • the water content in the range of 2 to 15%, the oil content between 0 and 5% and the grain size of about 0.5 mm to a maximum of 50 mm.
  • An advantage is a feed mixture of about 85% fuel raw material, such as hard coal, and about 15% mill scale.
  • the raw coal in this mixture may have a particle size of approximately between 0 and 10 mm (warning carbon) or between 0 and 50 mm.
  • the grain size of the scale can be up to a maximum of 50 mm.
  • the grain size after the mill is 50 to 80% ⁇ 90 microns.
  • the co-grinding of the solid fuel raw material, in particular hard coal, and the scale in a LOESCHE type roller mill can be carried out extremely inexpensively, efficiently and efficiently.
  • the parameters characterizing a milling process such as the specific working requirement and the power factor of the mill, are not adversely affected by addition of mill scale to hard coal or to a mixture of hard coal and petroleum coke of 5 to 15%.
  • the particle size distribution is almost identical, ie there are in the range of 50% R 90 microns to 0.05% R 90 microns only very small differences, for example, the specific labor requirements between a pure coal grinding and grinding with scale.
  • Both components are brought into intimate contact during the grinding process by the comminution processes under each roller. It is assumed that the metal oxides present in the mill scale will adhere quasi to the carbon grain or the carbon particles. Also of advantage for this are the oil residues present in the scale, which support the bonding or bonding process. This intimate connection between the coal grain to be burned and the scale constituents, which are metal oxides having a defined redox potential and a catalytic action, leads to a surprisingly improved burning behavior of the coal dust particles.
  • the fuel system according to the invention or the ready-to-inject fuel-scale mixture thus not only offers the possibility of recycling the by-product scale in an extraordinarily simple and economical way, but is simultaneously associated with an optimization of the blast furnace process.
  • a conveying device and / or a metering device for the scale material stored in a storage bunker or silo, e.g. Mill scale are arranged.
  • a premixing device may be arranged in front of the mill, so that a feed mixture having a predeterminable mixing ratio is formed and subjected to milling, e.g. can be supplied via a metering bunker.
  • the supply of the fuel mixture according to the invention takes place in the blow molding of the blast furnace. It is advantageous that the fuel system according to the invention can be fed to the blast furnace in the same way as pulverized coal by the PCI process via the blow molds.
  • the fuel system according to the invention can be fed to the blast furnace in the same way as pulverized coal by the PCI process via the blow molds.
  • the process sequence reveals four major process steps for the manufacture and use of a new blast furnace blast furnace fuel system.
  • a first stage the preparation of the components for the fuel system 10 according to the invention, which is produced by a common grinding in a mill 2 takes place.
  • an air flow roller mill of the LOESCHE type is provided for the grinding process.
  • other vertical Wälzmühlen or ball mills and the like can be used.
  • Starting materials are at least one solid carbon carrier 6, for example coal, in particular hard coal or lignite, or a mixture of hard coal and petroleum coke, hereinafter referred to as raw coal 6.
  • the raw coal 6 passes from a heap 8 in a raw coal bunker 16 and a conveyor or coal allocation 15 to a conveyor 5, which is the mill 2 upstream.
  • a prereduced iron material 7, preferably scale material, such as mill scale, from a scale bunker 17 or a storage device with the aid of a conveyor or scale allocation 14 of the conveyor 5 for producing a feed mixture 4 is fed.
  • the feed mixture 4 can also be produced in a mixed bed or a mixing drum by mixing the raw coal and the scale material with one another and feeding it to the mill via a metering bunker (not shown). It is expedient to feed the feed mixture 4 from raw coal 6 and mill scale 7 in a predeterminable mixing ratio of the mill 2.
  • a second process step the grinding of the feed mixture 4 to a ready-blowing fuel system 10. This takes place in the present embodiment in an air flow roller mill 2 and in inert mode.
  • a hot gas generator 11 By supplying a heated in a hot gas generator 11 to the required drying temperature inert or hot gas 9, the feed mixture 4 is subjected to a grinding-drying.
  • the hot gas 9 may advantageously be circulated (not shown) and the hot gas generator 11 may be e.g. be operated with blast furnace gas.
  • the milling of the fuel scale feed mixture 4 in the mill 2 can be carried out in the same way as the grinding of raw coal to pulverized coal.
  • the abandoned mill scale 7 has usually undergone a pretreatment to reduce the water content and the adhering oil.
  • the dust-like fuel-scale mixture 10 is deposited and passes through a cellular wheel 18 in a silo container 20th
  • the silo container 20 symbolizes the third method step with the further devices for pneumatic feeding of the ready-to-inject fuel-scale mixture 10.
  • From the distribution container 24 go accordingly the number of blow mold 27 injection lines 26 for the blow mold 27 from, over which the einblasfertigige fuel or raw coal-scale mixture 10 is blown together with the hot blast.
  • the carbon of the fuel burns to carbon monoxide, which reduces the iron oxide of the ores to iron to form carbon dioxide. Since the scale particles of the fuel scale are mainly iron oxides, they are also reduced.
  • An essential advantage of the fuel system according to the invention is that the reduction average amount for the scale compared to a comparable amount of ore to be fed, based on the metal content, is lower. At the same time a recovery of a by-product is achieved. It is also advantageous that, in particular oil-contaminated Zundermaterial can be used. It has also been shown that the feeding of the fuel-scale mixture according to the invention via the blow molding of the blast furnace to optimize the blast furnace process, eg by increasing the Abbrandbeuggung of the reducing agent, primarily the injected coal and at least partially also of the coke leads. Further advantages are the rational, effective production and supply of the fuel system according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Manufacture Of Iron (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Furnace Charging Or Discharging (AREA)
EP04729879A 2003-05-26 2004-04-28 Melange de combustible destine a etre introduit dans des tuyeres pour la production de fonte brute en haut fourneau et procede et installation de production et d'introduction dudit melange combustible Expired - Lifetime EP1629125B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04729879T PL1629125T3 (pl) 2003-05-26 2004-04-28 Mieszanina materiałów paliwowych do doprowadzania do dysz powietrznych podczas produkcji surówki hutniczej w wielkim piecu i sposób i instalacja do wytwarzania i dostarczania mieszaniny materiałów paliwowych

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10323902A DE10323902B4 (de) 2003-05-26 2003-05-26 Brennstoffgemisch zur Zuführung in Blasformen bei der Roheisenerzeugung im Hochofen und Verfahren zur Herstellung und Zuführung des Brennstoffgemisches
PCT/EP2004/004479 WO2004106558A1 (fr) 2003-05-26 2004-04-28 Melange de combustible destine a etre introduit dans des tuyeres pour la production de fonte brute en haut fourneau et procede et installation de production et d'introduction dudit melange combustible

Publications (2)

Publication Number Publication Date
EP1629125A1 true EP1629125A1 (fr) 2006-03-01
EP1629125B1 EP1629125B1 (fr) 2011-12-14

Family

ID=33482185

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04729879A Expired - Lifetime EP1629125B1 (fr) 2003-05-26 2004-04-28 Melange de combustible destine a etre introduit dans des tuyeres pour la production de fonte brute en haut fourneau et procede et installation de production et d'introduction dudit melange combustible

Country Status (7)

Country Link
EP (1) EP1629125B1 (fr)
AT (1) ATE537273T1 (fr)
DE (1) DE10323902B4 (fr)
ES (1) ES2377499T3 (fr)
PL (1) PL1629125T3 (fr)
TW (1) TWI290957B (fr)
WO (1) WO2004106558A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4104072A1 (de) 1991-02-11 1992-08-13 Fechner Bruno Gmbh & Co Kg Recyclingverfahren fuer oelhaltigen walzzunder
DE59409998D1 (de) * 1993-04-26 2002-01-17 Der Gruene Punkt Duales Syst Verfahren zur Erzeugung von Metall aus Metallerzen
DE4433596A1 (de) * 1994-09-21 1996-03-28 Heckett Multiserv Plc Verfahren zum pneumatischen Fördern von kunststoffhaltigen Materialien in ein Reaktionsgefäß
DE19755389A1 (de) * 1997-12-12 1999-06-17 Krupp Polysius Ag Verfahren und Anlage zum pneumatischen Fördern und Einblasen von Schüttgut in einen metallurgischen Schmelzreaktor
US6077325A (en) * 1998-06-09 2000-06-20 Betzdearborn Inc. Method of adding coal combustion enhancer to blast furnace
CZ288751B6 (cs) * 1998-10-08 2001-08-15 Třinecké Železárny A.S. Způsob přívodu náhradních paliv do vysoké pece
DE10038566A1 (de) 2000-08-03 2002-03-21 Wolfgang Schwetlick Verwertung von ölbelastetem Walzenzunder in Schachtöfen und Konvertern
DE10050332C2 (de) * 2000-10-11 2003-11-27 Loesche Gmbh Verfahren und Vorrichtung zur Präparierung von Brennstoffen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004106558A1 *

Also Published As

Publication number Publication date
DE10323902A1 (de) 2005-01-05
PL1629125T3 (pl) 2012-05-31
TWI290957B (en) 2007-12-11
ATE537273T1 (de) 2011-12-15
EP1629125B1 (fr) 2011-12-14
DE10323902B4 (de) 2005-05-25
WO2004106558A1 (fr) 2004-12-09
ES2377499T3 (es) 2012-03-28
TW200508399A (en) 2005-03-01

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