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WO2009119843A1 - Appareil d’introduction de matière première pour fabrication de fonte liquide et procédé d’introduction de matière première pour fabrication de fonte liquide - Google Patents

Appareil d’introduction de matière première pour fabrication de fonte liquide et procédé d’introduction de matière première pour fabrication de fonte liquide Download PDF

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Publication number
WO2009119843A1
WO2009119843A1 PCT/JP2009/056381 JP2009056381W WO2009119843A1 WO 2009119843 A1 WO2009119843 A1 WO 2009119843A1 JP 2009056381 W JP2009056381 W JP 2009056381W WO 2009119843 A1 WO2009119843 A1 WO 2009119843A1
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WO
WIPO (PCT)
Prior art keywords
temperature
reduced iron
low
charging
melting 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.)
Ceased
Application number
PCT/JP2009/056381
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English (en)
Japanese (ja)
Inventor
雅孝 立石
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Publication of WO2009119843A1 publication Critical patent/WO2009119843A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F27B19/00—Combinations of different kinds of furnaces that are not all covered by any single one of main groups F27B1/00 - F27B17/00
    • F27B19/04—Combinations of different kinds of furnaces that are not all covered by any single one of main groups F27B1/00 - F27B17/00 arranged for associated working
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
    • C21B13/105—Rotary hearth-type furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
    • C21B13/143—Injection of partially reduced ore into a molten bath
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/56—Manufacture of steel by other methods
    • C21C5/567—Manufacture of steel by other methods operating in a continuous way
    • 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
    • F27B3/18—Arrangements of devices for charging
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0025—Adding carbon material
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention uses two or more charging devices, a high temperature charging device and a low temperature (room temperature) charging device, and controls raw material charging from the low temperature charging device, thereby providing a rotary hearth furnace and a melting furnace.
  • This invention relates to a molten iron manufacturing raw material charging apparatus and a molten iron manufacturing raw material charging method capable of improving the matching, improving the productivity, and improving the plant operating rate.
  • the process of reducing iron ore with gas or solid carbon to produce solid reduced iron is generally called the direct reduced iron production process: the DR process (Direct reduction process), and the reduced iron obtained by this iron production process is DRI (Direct reduced iron).
  • a shaft furnace type and a rotary hearth furnace type represented by the Midrex method are known.
  • powdered iron ore and coal are mixed and granulated into pellets or briquettes, reduced in a donut-shaped rotary furnace, then melted in a melting furnace at a high temperature to form hot metal. To manufacture.
  • the reduction furnaces such as shaft furnaces and rotary hearth furnaces are basically operated continuously. On the other hand, since the melting furnace provided in the downstream needs to be maintained regularly, the operation cycle is different from the reducing furnace provided in the upstream.
  • the operating cycle of the melting furnace is shorter than the cycle of the reducing furnace, and the productivity of the reducing furnace and the melting furnace does not match at startup.
  • a high-temperature reduced iron storage tank is provided in order to achieve matching between a continuously operated reducing furnace and a relatively non-continuously operated melting furnace.
  • the high-temperature reduced iron discharged from the reduction furnace is temporarily stored in the high-temperature reduced iron storage tank, and reduced iron is supplied according to the needs of the melting furnace.
  • the present invention has been made in consideration of the problems in the conventional DR process as described above.
  • the present invention improves the matching between a rotary hearth furnace that is operated continuously and a melting furnace that is operated in batch, maintains productivity, and can increase the operating rate of the reduction furnace and melting furnace, and can input raw materials for molten iron production
  • An apparatus and a raw material charging method for producing molten iron are provided.
  • the raw material charging apparatus for producing molten iron includes a high-temperature charging system for supplying hot high-temperature reduced iron produced by a direct reduction steelmaking process to a melting furnace, and cooled low-temperature reduced iron and carbonaceous material in the melting furnace.
  • a raw material charging device for producing molten iron having a low temperature charging system to supply The high temperature charging system includes a high temperature storage container for storing reduced iron discharged hot, and a quantitative cutting device for supplying the high temperature reduced iron in the high temperature storage container to the melting furnace in a predetermined amount.
  • the charging system for low temperature includes a first hopper for storing the low-temperature reduced iron, a feeder for adjusting a cutting amount of the low-temperature reduced iron from the first hopper, a second hopper for storing carbonaceous material, and the second hopper. And a feeder that adjusts the amount of carbon material cut out from the hopper.
  • the molten iron production raw material charging device has a charging chute for charging low-temperature reduced iron and carbonaceous material cut out from the first hopper and the second hopper into the melting furnace, and generates the generated gas in the melting furnace. It is preferable that a blocking device for preventing intrusion is interposed in the charging chute.
  • the cutting ability of the low temperature charging system is preferably 0 to 30% of the cutting capacity of the high temperature charging system.
  • the raw material charging method for producing molten iron according to the present invention includes a high-temperature charging system for supplying hot high-temperature reduced iron produced by a direct reduction iron-making process to a melting furnace, and cooled low-temperature reduced iron and carbon material in the melting furnace.
  • a low-temperature charging system to supply The low-temperature reduced iron and the carbonaceous material are supplied from the low-temperature charging system to the melting furnace at a controlled charging speed, and after the low-temperature reduced iron is dissolved in the melting furnace, the raw material is charged for the low-temperature.
  • the gist is that the input system can be switched to the high temperature input system.
  • the low temperature reduced iron In the state where the high temperature reduced iron is supplied hot by the high temperature charging system, when a predetermined amount of the low temperature reduced iron is charged from the low temperature charging system and the molten metal temperature tends to decrease, the low temperature reduced iron is used.
  • the molten metal temperature tends to rise, the molten metal temperature can be kept constant by increasing the low-temperature reduced iron charging speed while keeping the high-temperature reduced iron charging speed constant. it can.
  • the raw material charging method for producing molten iron according to the present invention includes a high temperature charging system for supplying hot high-temperature reduced iron produced by a direct reduction iron-making process to a melting furnace, and melting the cooled low-temperature reduced iron and carbonaceous material as described above.
  • a low-temperature charging system for supplying to the furnace In a state where the high temperature reduced iron is supplied hot by the high temperature charging system, a predetermined amount of the low temperature reduced iron is charged from the low temperature charging system, and when the molten metal temperature tends to decrease, the low temperature reduced iron is charged.
  • the gist is to keep the melt temperature constant by lowering the speed and increasing the charging speed of the low-temperature reduced iron when the melt temperature tends to rise.
  • the present invention has the advantage that the matching between the reducing furnace operated continuously and the melting furnace operated discontinuously can be improved, and the operating rate of each furnace can be increased while maintaining a predetermined productivity.
  • FIG. 1 shows a configuration in a case where a raw material charging apparatus for producing molten iron according to the present invention (hereinafter referred to as a raw material charging apparatus) is directly applied to a reduction iron making facility.
  • a raw material charging apparatus for producing molten iron according to the present invention
  • a direct reduction iron making facility 1 has a rotary hearth type heating reduction furnace (hereinafter referred to as a rotary hearth furnace) 2, and the rotary hearth 2 a of the rotary hearth furnace 2 is counterclockwise ( It rotates in the direction of arrow A).
  • a rotary hearth furnace a rotary hearth type heating reduction furnace
  • the rotational speed of the rotary hearth furnace 2 varies depending on the size and operating conditions of the heating and reducing furnace, but usually makes one turn in about 6 to 16 minutes.
  • a plurality of heating burners 2c are provided on the wall surface of the furnace body 2b in the rotary hearth furnace 2, and heat is supplied to the hearth by combustion heat or radiant heat generated by these heating burners 2c.
  • the raw material mixture M charged on the rotary hearth 2a made of refractory material moves in the rotary hearth furnace 2 in the circumferential direction on the rotary hearth 2a, the combustion heat and radiant heat from the heating burner 2c. Heated by.
  • the iron oxide in the raw material mixture M is reduced and separated from the by-product molten slag and melted by receiving carburization with the remaining carbonaceous reducing agent. However, it aggregates in a granular form and becomes granular reduced iron N.
  • the granular reduced iron N discharged from the rotary downstream zone of the rotary hearth furnace 2 at a high temperature is accommodated in the high temperature DRI transfer container 3 and moved to the raw material charging device 4.
  • the raw material charging device 4 melts the cooled low-temperature reduced iron and carbonaceous material, and the high-temperature charged system 10 for supplying hot high-temperature reduced iron produced in the direct reduction steelmaking process to a melting furnace described later. And a low temperature charging system 11 to be supplied to the furnace.
  • High temperature charging system The high temperature DRI transport container 3 moved to the high temperature charging system 10 of the raw material charging device 4 is connected to the upper connection portion 5 a of the intermediate bin (high temperature storage container) 5.
  • the intermediate bin 5 includes an upper slide gate 5b and a lower slide gate 5c.
  • a water-cooled screw feeder (quantitative cutting device) 6 as a high-temperature charging device is provided below the intermediate bottle 5, and a feed bin 7 with a load cell is further provided below the water-cooled screw feeder 6. Is provided.
  • controllability is poor below the lower limit of the cutting ability and cannot be used.
  • the water-cooled screw feeder 6 of this embodiment is no exception, and the minimum controllable charging speed was about 1,000 kg / h (about 20% of the rating).
  • the cutting capacity (rated) of the vibration feeder in the low temperature charging system 11 is 1.5 t / h
  • a control range of at least 0 to 30% of the cutting capacity in the high temperature charging system 10 is set for low temperature. It is possible to cover with the input system 11.
  • the cutting ability of the vibration feeder is set to 30% so that the high temperature charging system 10 can be substituted even in the case described above.
  • the scale of the raw material charging device 4 is increased, which not only increases the plant cost but also complicates the control.
  • a plurality of vibration feeders having a cutting ability of 30% or less can be provided according to the matching status of the continuous process.
  • the feed bin 7 is provided with an upper slide gate 7 a and a lower slide gate 7 b, and the lower portion of the feed bin 7 is connected to the melting furnace 9 through the charging unit 8.
  • slide gates 7a and 7b are provided. Since the input system upstream of the feed bin 7 has low sealing performance, exhaust gas generated during the operation of the melting furnace flows into the upstream side of the feed bin 7 and comes into contact with the outside air, which may cause ignition. The upper and lower slide gates 7 a and 7 b of the feed bin 7 have an effect of preventing exhaust gas from flowing into the upstream side of the feed bin 7.
  • the slide gates 5b and 5c and the slide gates 7a and 7b are provided in order to prevent the gas generated from the melting furnace 9 from entering the high temperature charging system 10.
  • the charging unit 8 is provided with a low temperature charging system 11 in addition to the high temperature charging system 10.
  • the low temperature charging system 11 includes a low temperature DRI hopper (first hopper) 12, a vibration feeder (feeder) 13 as a low temperature charging device for cutting out the low temperature DRI from the low temperature DRI hopper 12, and a coal hopper (second hopper). Hopper) 14, a vibration feeder (feeder) 15 as a low temperature charging device for cutting out carbonaceous material from the coal hopper 14, and a conveyor 16 for conveying the raw material supplied from these hoppers forward
  • the hopper 16a provided at the front end portion of the conveyor 16 and the chute (feed chute) 17 communicating with the throwing portion 8 and a rotary valve (blocking device) 17a provided on the chute 17 are mainly configured. ing.
  • shut-off device is not limited to the rotary valve, and can be constituted by a double damper on-off valve or the like.
  • the rotary valve 17a prevents gas generated from the melting furnace 9 from entering the low temperature charging system 11.
  • the said vibration feeder as a continuous cutting device, it is not restricted to this, Feeders of other systems, such as a screw feeder and a table feeder, can also be used.
  • the melting furnace 9 is provided with an oxygen blowing lance 18 for blowing high-purity oxygen toward the slag layer on the molten metal surface of the melting furnace 9.
  • an oxygen blowing lance 18 for blowing high-purity oxygen toward the slag layer on the molten metal surface of the melting furnace 9.
  • FIG. 2 is a graph showing the control operation from the initial operation to the stationary phase of the melting furnace 9, and it is assumed that the rotary hearth furnace 2 is continuously operated.
  • the horizontal axis indicates the elapsed time (minutes) from the start of blowing.
  • the vertical axis on the left indicates the acid feed rate (Nm 3 / h) and the carbonaceous material / DRI feed rate (kg / h).
  • the right vertical axis indicates the molten metal temperature (° C.).
  • the acid feed rate O is constant, and the carbonaceous material feed rate C is constant after 10 minutes.
  • the raw material charging apparatus 4 of the present invention includes a low temperature charging system 11 separately from the high temperature charging system 10.
  • the amount of reduced iron N discharged from the rotary hearth furnace 2 can be supplied to the melting furnace 9 as it is by controlling the amount of the low temperature DRI and the carbonaceous material charged from the low temperature charging system 11.
  • the carbonaceous material is added to reduce slag containing FeO at a high concentration.
  • the low temperature DRI charging speed L and the carbonaceous material charging speed C are increased step by step from the start-up of the melting furnace 9.
  • an arrow B indicates the timing of switching from low temperature DRI input to high temperature DRI input.
  • FIG. 3 is a graph showing the charging operation for performing steady operation.
  • the high temperature DRI charging speed H is constant. Further, the carbon material charging speed C and the acid feeding speed O are also constant.
  • the low temperature DRI charging speed L is slightly decreased (in the graph, the falling portion L 3 ).
  • the raw material charging device of the present invention is interposed between the rotary hearth furnace and the melting furnace.
  • the raw material charging apparatus of the present invention is not limited to a rotary hearth furnace, and can be interposed between any furnace that performs a direct reduction iron making process and a melting furnace.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

L'invention concerne un équipement de fabrication de fer à réduction directe, dans lequel une concordance entre un four à sole tournante actionné en continu et un four à fusion actionné en discontinu est améliorée et une haute productivité peut être réalisée. Un appareil d'introduction de matière première pour la fabrication de fonte liquide comprend un système d'introduction (10) pour l'utilisation à haute température qui introduit du fer réduit à haute température, produit par un procédé de fabrication de fer à réduction directe, dans un état chaud dans un four de fusion (9), et un système d'introduction (11) pour une utilisation à basse température qui introduit du fer réduit à basse température refroidi et une matière carbonée dans le four de fusion (9). Le système d'introduction (10) pour une utilisation à haute température comprend un contenant de stockage (5) pour une utilisation à haute température qui stocke du fer réduit évacué dans un état chaud, et un dispositif de décollage de quantité constante (6) qui introduit du fer réduit à haute température dans le contenant de stockage (5) pour une utilisation à haute température par une quantité prédéterminée dans le four de fusion (9). Le système d'introduction (11) pour une utilisation à basse température comprend une première trémie (12) qui stocke du fer réduit à basse température, un dispositif d'amenée (13) qui régule la quantité du fer réduit à basse température décollé de la première trémie (12), et une seconde trémie (14) qui stocke la matière carbonée, et un dispositif d'amenée (15) qui régule la quantité de la matière carbonée décollée de la seconde trémie (14).
PCT/JP2009/056381 2008-03-28 2009-03-27 Appareil d’introduction de matière première pour fabrication de fonte liquide et procédé d’introduction de matière première pour fabrication de fonte liquide Ceased WO2009119843A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008087654A JP5323378B2 (ja) 2008-03-28 2008-03-28 溶鉄製造用原料投入装置および溶鉄製造用原料投入方法
JP2008-087654 2008-03-28

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WO2009119843A1 true WO2009119843A1 (fr) 2009-10-01

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PCT/JP2009/056381 Ceased WO2009119843A1 (fr) 2008-03-28 2009-03-27 Appareil d’introduction de matière première pour fabrication de fonte liquide et procédé d’introduction de matière première pour fabrication de fonte liquide

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WO (1) WO2009119843A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT508953B1 (de) * 2009-10-16 2011-07-15 Siemens Vai Metals Tech Gmbh Verfahren und vorrichtung zur chargierung in ein einschmelzaggregat
CN105180669B (zh) * 2015-10-21 2017-02-22 大连华锐重工集团股份有限公司 埋弧电炉定量防爆加调整料装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11217617A (ja) * 1998-01-29 1999-08-10 Nkk Corp 冶金炉への原材料供給方法及びその装置
JP2000054014A (ja) * 1998-07-31 2000-02-22 Nkk Corp 溶融還元設備における鉱石装入装置
JP2002097507A (ja) * 2000-09-19 2002-04-02 Mitsubishi Heavy Ind Ltd 溶銑製造方法および溶銑製造装置
WO2006046606A1 (fr) * 2004-10-29 2006-05-04 Kabushiki Kaisha Kobe Seiko Sho Procédé servant à produire du fer fondu et appareil pour cela

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11217617A (ja) * 1998-01-29 1999-08-10 Nkk Corp 冶金炉への原材料供給方法及びその装置
JP2000054014A (ja) * 1998-07-31 2000-02-22 Nkk Corp 溶融還元設備における鉱石装入装置
JP2002097507A (ja) * 2000-09-19 2002-04-02 Mitsubishi Heavy Ind Ltd 溶銑製造方法および溶銑製造装置
WO2006046606A1 (fr) * 2004-10-29 2006-05-04 Kabushiki Kaisha Kobe Seiko Sho Procédé servant à produire du fer fondu et appareil pour cela

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JP5323378B2 (ja) 2013-10-23
JP2009243708A (ja) 2009-10-22

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