EP2641981A2 - Vorrichtung zur herstellung von geschmolzenem eisen und verfahren zur herstellung von geschmolzenem eisen damit - Google Patents

Vorrichtung zur herstellung von geschmolzenem eisen und verfahren zur herstellung von geschmolzenem eisen damit Download PDF

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Publication number
EP2641981A2
EP2641981A2 EP11842354.0A EP11842354A EP2641981A2 EP 2641981 A2 EP2641981 A2 EP 2641981A2 EP 11842354 A EP11842354 A EP 11842354A EP 2641981 A2 EP2641981 A2 EP 2641981A2
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EP
European Patent Office
Prior art keywords
iron
compacted iron
temperature
compacted
storage tank
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
EP11842354.0A
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English (en)
French (fr)
Other versions
EP2641981B1 (de
EP2641981A4 (de
Inventor
Myoung-Kyun Shin
Sang-Hoon Joo
Dong-Jin Kim
Jin-Tae Kim
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.)
Posco Holdings Inc
Original Assignee
Posco Co 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 Posco Co Ltd filed Critical Posco Co Ltd
Publication of EP2641981A2 publication Critical patent/EP2641981A2/de
Publication of EP2641981A4 publication Critical patent/EP2641981A4/de
Application granted granted Critical
Publication of EP2641981B1 publication Critical patent/EP2641981B1/de
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
    • C21B13/002—Reduction of iron ores by passing through a heated column of carbon
    • 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

Definitions

  • the present invention relates to an apparatus for manufacturing molten iron and, more particularly, to an apparatus for manufacturing molten iron which is capable of performing a molten iron work stably and efficiently by using a high-temperature compacted iron storage tank.
  • an apparatus for manufacturing molten iron which includes a multi-stage fluidized furnace and a multi-stage smelting furnace and directly uses fine or lump coal and fine iron-containing ores, if reducing gas is not sufficiently supplied from the smelting furnace to the multi-stage fluidized furnace, the formation of a fluidized bed is impossible, thereby making impossible a work itself.
  • the above condition is generated when a sufficient amount of reducing gas for the multi-stage fluidized furnace is not supplied from the smelting furnace, that is, when a work is started or stopped, and is also generated when the amount of reducing gas generated is reduced due to a reduction of the smelting furnace attributable to smelting furnace work and equipment obstacles.
  • the stop of the high-temperature reduced iron supplied to the smelting furnace is also generated when equipment for the multi-stage fluidized furnace or a high-temperature compacting apparatus fails.
  • the smelting furnace is overheated, and a smelting furnace work must be stopped.
  • an additional iron source must be directly supplied to the smelting furnace.
  • the additional iron source must be lump reduced iron because it has to be directly supplied to the smelting furnace. Accordingly, lump reduced iron is externally supplied in a conventional apparatus for manufacturing molten iron that directly uses fine or lump coal and ores containing fine iron ores.
  • the externally supplied lump reduced iron is more expensive than high-temperature reduced iron manufactured through a fluidized furnace, and it also increases a work cost for the apparatus for manufacturing molten iron. Furthermore, since the externally supplied lump reduced iron must be used in a room temperature state, amount of heat for a temperature rise in the externally supplied lump reduced iron is greater than that in the high-temperature reduced iron, thereby increasing the amount of coal necessary within the smelting furnace. As a result, a molten iron yield versus a design capacity is increased, and thus the productivity of the conventional apparatus for manufacturing molten iron that directly uses fine or lump coal and fine iron-containing ores is deteriorated.
  • the present invention has been made in an effort to provide an apparatus for manufacturing molten iron and a method for manufacturing thereof having an advantage of providing means for increasing the stability and efficiency of a molten iron manufacturing process by manufacturing excess high-temperature compacted iron when a normal work is performed, storing the excess high-temperature compacted iron in a compacted iron storage tank, and charging the stored compacted iron into a multi-stage smelting furnace when an abnormal work is performed in an apparatus for manufacturing molten iron using a multi-stage fluidized furnace and the multi-stage smelting furnace.
  • An exemplary embodiment of the present invention provides an apparatus for manufacturing molten iron, including a multi-stage fluidized furnace for converting fine iron ores into reduced fine iron by reducing fine iron ores, at least one compacted iron manufacturing device for manufacturing high-temperature compacted iron by compressing the reduced fine iron, at least one crushing device for crushing the high-temperature compacted iron at a specific granularity, a first conveyance device for conveying the crushed high-temperature compacted iron, and a smelting furnace for melting the conveyed high-temperature compacted iron by combusting fine or lump coal and supplying reducing gas generated within the smelting furnace to the multi-stage fluidized furnace.
  • the apparatus for manufacturing molten iron in accordance with an exemplary embodiment of the present invention further includes at least one compacted iron storage tank for storing some of the crushed high-temperature compacted iron.
  • the apparatus for manufacturing molten iron in accordance with an exemplary embodiment of the present invention further includes a second conveyance device for conveying the high-temperature compacted iron to the compacted iron storage tank.
  • 2-direction suits are disposed under the at least one crushing device.
  • the first outlets of the 2-direction suits supply the crushed high-temperature compacted iron to the first conveyance device, and the second outlets of the 2-direction suits supply the crushed high-temperature compacted iron to the second conveyance device.
  • a nitrogen supply pipe is disposed at the bottom of the compacted iron storage tank.
  • gas discharge pipes are disposed at the top of the compacted iron storage tank.
  • the gas discharge pipes are equipped with respective pressure control valves and configured to maintain pressure within the compacted iron storage tank higher than atmospheric pressure.
  • the compacted iron storage tank includes a level system for detecting an amount of compacted iron charged into the compacted iron storage tank.
  • the apparatus for manufacturing molten iron further includes a third conveyance device, wherein discharge devices are provided under the compacted iron storage tank and configured to supply the compacted iron to the third conveyance device, and the third conveyance device conveys the compacted iron to the first conveyance device.
  • the apparatus for manufacturing molten iron further includes a carbon dioxide removal device for ramifying some of exhaust gas discharged from the multi-stage fluidized furnace, removing carbon dioxide from the ramified exhaust gas, adding the exhaust gas to the reducing gas supplied from the smelting furnace, and supplying the added reducing gas to the multi-stage fluidized furnace.
  • the apparatus for manufacturing molten iron further includes a gas circulation cooling device for controlling temperature of reducing gas supplied to the multi-stage fluidized furnace by ramifying some of reducing gas generated from the smelting furnace, cooling the ramified reducing gas, and circulating the reducing gas supplied from the smelting furnace again.
  • Another exemplary embodiment of the present invention provides a method of manufacturing molten iron, including reducing fine iron ores into reduced fine iron by using the multi-stage fluidized furnace, manufacturing high-temperature compacted iron by compressing the reduced fine iron using the compacted iron manufacturing device, crushing the high-temperature compacted iron by using a crushing device, conveying the crushed compacted iron to the charging device, and charging the compacted iron from the charging device into the smelting furnace and melting the charged compacted iron by combusting fine or lump coal.
  • the method of manufacturing molten iron in accordance with an exemplary embodiment of the present invention further includes the step of conveying some of the crushed compacted iron to the compacted iron storage tank.
  • the method of manufacturing molten iron further includes the step of distributing the crushed compacted iron to the charging device or the compacted iron storage tank by using the 2-direction suits.
  • the high-temperature compacted iron necessary for the smelting furnace is able to be manufactured through the multi-stage fluidized furnace, the compacted iron manufacturing device, and the crushing device, excess high-temperature compacted iron exceeding an amount of the high-temperature compacted iron necessary for the smelting furnace is manufactured and
  • the excess high-temperature compacted iron is intermittently conveyed to and stored in the compacted iron storage tank by way of an action of the 2-direction suits.
  • the compacted iron stored in the compacted iron storage tank is continuously supplied to the smelting furnace via a conveyance device.
  • the excess rate (yield of the high-temperature compacted iron)/(demand quantity of the high-temperature compacted iron) ⁇ 100
  • the excess rate is 110% to 120%.
  • the time that the high-temperature compacted iron stay in the compacted iron storage tank is 6 hours to 12 hours.
  • the apparatus for manufacturing molten iron by supplying means for efficiently supplying high-temperature reduced iron to the smelting furnace independently from means for reducing, compacting, and charging fine iron ores in the multi-stage fluidized furnace, the manufacturing of molten iron in the smelting furnace can be efficiently performed even when an initial work is performed or the operation of the multi-stage fluidized furnace is stopped due to the occurrence of an equipment obstacle. Accordingly, the productivity of a molten iron manufacturing device that directly uses fine or lump coal and ores containing fine iron can be improved.
  • FIG. 1 is a diagram schematically showing the construction of an apparatus for manufacturing molten iron using a compacted iron storage tank capable of storing excess high-temperature compacted iron in accordance with an exemplary embodiment of the present invention.
  • FIG. 1 is a diagram schematically showing the construction of an apparatus for manufacturing molten iron using a compacted iron storage tank 600 capable of storing excess high-temperature compacted iron in accordance with an exemplary embodiment of the present invention.
  • fine iron ores are reduced to reduced fine iron by a multi-stage fluidized furnace 100, high-temperature compacted iron is fabricated by compressing the reduced fine iron, and the high-temperature compacted iron is crushed to a specific granularity.
  • the crushed high-temperature compacted iron is supplied to a first conveyance device 400 by using 2-direction suits 700 in order convey the crushed high-temperature compacted iron to a charging device, and excess compacted iron is supplied to a second conveyance device 430 that is additionally provided so that the excess compacted iron is stored in a compacted iron charging tank. Accordingly, when a work is initiated or stopped, when a work obstacle is generated, and/or and when an equipment obstacle is generated, the stored compacted iron is supplied to a smelting furnace 500, thereby being capable of manufacturing stable molten iron.
  • the apparatus for manufacturing molten iron in accordance with an exemplary embodiment of the present invention includes a multi-stage fluidized reduction furnace for converting fine iron ores into reduced fine iron by reducing the fine iron ores, at least one high-temperature compacting apparatus for fabricating high-temperature compacted iron by compressing the reduced fine iron, at least one crushing device 300 for crushing the high-temperature compacted iron at a specific granularity, the first conveyance device 400 for conveying the crushed high-temperature compacted iron, and the smelting furnace 500 for melting the conveyed high-temperature compacted iron by combusting fine or lump coal and supplying reducing gas generated within the smelting furnace to the multi-stage fluidized furnace.
  • FIG. 1 illustrates a three-stage fluidized furnace 100, but this is only illustrative.
  • the number of fluidized furnaces 100 can be three or more.
  • the first stage fluidized furnace 100 preheats fine iron ores
  • the second stage fluidized furnace 100 preliminarily reduces the preheated fine iron ores
  • the third stage fluidized furnace 100 finally reduces the fine iron ores.
  • Secondary materials such as limestone and dolomite, and an additive can also be charged into the multi-stage fluidized furnace 100 in order to prevent a phenomenon in which the fine iron ores are adhered to the inside of the multi-stage fluidized furnace 100 and prevent the reduced fine iron from being broken within the smelting furnace 500.
  • lump reduced fine iron is manufactured using a compacted iron manufacturing device 200.
  • the compacted iron manufacturing device 200 manufactures compacted iron by compressing the reduced fine iron ores charged therein through a pair of rolls.
  • the high-temperature compacted iron manufactured by the compacted iron manufacturing device 200 is crushed to a proper granularity by the crushing device 300 disposed under the compacted iron manufacturing device 200 before the high-temperature compacted iron is charged into the smelting furnace 500.
  • the crushed compacted iron is supplied to the first conveyance device 400 through the first outlets of the 2-direction suits 700 disposed under the crushing device 300.
  • the high-temperature compacted iron supplied to the first conveyance device 400 is conveyed to a charging device in order to be charged into the smelting furnace 500 and is continuously charged from the charging device to the smelting furnace 500.
  • the smelting furnace 500 manufactures molten iron by melting the high-temperature compacted iron through the combustion of fine coal or compacted lump coal.
  • the smelting furnace 500 melts the compacted iron by combusting fine or lump coal using oxygen. At this time, reducing gas is generated.
  • the smelting furnace 500 supplies the generated reducing gas to the multi-stage fluidized furnace 100 connected to the smelting furnace 500, so that reducing gas for reducing reduced fine iron is supplied to the multi-stage fluidized furnace 100.
  • the high-temperature compacted iron is supplied to the second conveyance device 430 disposed under the 2-direction suits 700 through the second outlets of the 2-direction suits 700.
  • the high-temperature compacted iron is conveyed to and stored in the compacted iron storage tank 600 through the second conveyance device 430.
  • the 2-direction suits 700 are disposed under the at least one crushing device 300.
  • the first outlets of the 2-direction suits 700 supply the crushed high-temperature compacted iron to the first conveyance device 400, and the second outlets of the 2-direction suits 700 supply the crushed high-temperature compacted iron to the second conveyance device 430.
  • Valves are provided in the respective outlets of the 2-direction suits 700 so that the high-temperature compacted iron can be selectively supplied to the first conveyance device 400 or the second conveyance device 430.
  • a nitrogen supply pipe 610 is disposed at the lower part of the compacted iron storage tank 600, and gas discharge pipes 630 are disposed at the top of the compacted iron storage tank 600.
  • the gas discharge pipes 630 includes respective pressure control valves 635 for maintaining pressure within the compacted iron storage tank 600 higher than atmospheric pressure.
  • the nitrogen supply pipe 610 disposed at the lower part of the compacted iron storage tank 600 supplies nitrogen
  • the gas discharge pipes 630 disposed at the top of the compacted iron storage tank 600 discharges gas.
  • the pressure control valves 635 included in the gas discharge pipes 630 maintain pressure within the compacted iron storage tank 600 higher than atmospheric pressure so that the inflow of air from the outside can be minimized.
  • the compacted iron storage tank 600 further includes a level system for detecting the amount of compacted iron charged therein.
  • the level system continuously measures the height of a high-temperature compacted iron layer formed within the compacted iron storage tank 600. Accordingly, compacted iron exceeding the capacity of the compacted iron storage tank 600 can be prevented from being supplied to the compacted iron storage tank 600.
  • the level system can detect the amount of high-temperature compacted iron stored in the compacted iron storage tank 600.
  • the apparatus for manufacturing molten iron further includes a third conveyance device 450.
  • Discharge apparatuses 660 are disposed at the bottom of the compacted iron storage tank 600 and configured to supply compacted iron to the third conveyance device 450.
  • the third conveyance device 450 conveys the compacted iron to the first conveyance device 400.
  • the apparatus for manufacturing molten iron in accordance with an exemplary embodiment of the present invention can further include an exhaust gas reforming apparatus 800 for cooling gas discharged from the multi-stage fluidized furnace 100 via a water collector, ramifying some of the discharged gas, removing carbon dioxide from the ramified gas by compressing the ramified gas, mixing the ramified gas with high-temperature reducing gas discharged from the smelting furnace 500, and additionally supplying the mixed reducing gas to the multi-stage fluidized furnace 100.
  • an exhaust gas reforming apparatus 800 for cooling gas discharged from the multi-stage fluidized furnace 100 via a water collector, ramifying some of the discharged gas, removing carbon dioxide from the ramified gas by compressing the ramified gas, mixing the ramified gas with high-temperature reducing gas discharged from the smelting furnace 500, and additionally supplying the mixed reducing gas to the multi-stage fluidized furnace 100.
  • the temperature of the high-temperature reducing gas can be primarily cooled by mixing room-temperature carbon dioxide removal gas supplied from the exhaust gas reforming apparatus 800 with high-temperature reducing gas discharged from the smelting furnace 500.
  • the apparatus for manufacturing molten iron in accordance with an exemplary embodiment of the present invention can further include a gas circulation cooling device 900 for ramifying some of the high-temperature reducing gas mixed with the carbon dioxide removal gas, cooling the ramified reducing gas via the water collector, compressing the cooled reducing gas, and mixing the compressed reducing gas with the high-temperature reducing gas so that temperature of the mixed reducing gas is additionally cooled up to temperature of the reducing gas supplied to the multi-stage fluidized furnace 100.
  • a gas circulation cooling device 900 for ramifying some of the high-temperature reducing gas mixed with the carbon dioxide removal gas, cooling the ramified reducing gas via the water collector, compressing the cooled reducing gas, and mixing the compressed reducing gas with the high-temperature reducing gas so that temperature of the mixed reducing gas is additionally cooled up to temperature of the reducing gas supplied to the multi-stage fluidized furnace 100.
  • a method of manufacturing molten iron in accordance with another exemplary embodiment of the present invention includes the steps of reducing fine iron ores into reduced fine iron by using the multi-stage fluidized furnace 100, manufacturing high-temperature compacted iron by compressing the reduced fine iron by using the compacted iron manufacturing device 200, crushing the high-temperature compacted iron by using the crushing device 300, conveying the crushed compacted iron to the charging device, charging the compacted iron from the charging device into the smelting furnace 500, and melting the charged compacted iron by combusting fine or lump coal.
  • the method of manufacturing molten iron further includes the step of conveying some of the crushed compacted iron to the compacted iron storage tank 600.
  • the method of manufacturing molten iron further includes the step of distributing the crushed compacted iron to the charging device or the compacted iron storage tank 600 by using the 2-direction suits 700.
  • molten iron is normally continuously manufactured, that is, if high-temperature compacted iron necessary for the smelting furnace 500 can be manufactured through the multi-stage fluidized furnace 100, the compacted iron manufacturing device, and the crushing device 300, excess high-temperature compacted iron that exceeds the amount of the high-temperature compacted iron necessary for the smelting furnace 500 is manufactured.
  • the excess high-temperature compacted iron intermittently discharges the high-temperature compacted iron from the crushing device 300 to the conveyance device by way of an action of the 2-direction suits 700, so the high-temperature compacted iron can be conveyed to and stored in the compacted iron storage tank 600.
  • molten iron in the method of manufacturing molten iron, if molten iron is not normally manufactured, that is, if high-temperature compacted iron necessary for the smelting furnace 500 may not be manufactured through the multi-stage fluidized furnace 100, the compacted iron manufacturing device, and the crushing device 300, compacted iron stored in the compacted iron storage tank 600 is discharged to the third conveyance device 450 via the discharge devices 660 and the third conveyance device 450 conveys the discharged compacted iron to the first conveyance device 400. Accordingly, high-temperature compacted iron necessary for the smelting furnace 500 can be continuously supplied.
  • a yield of high-temperature compacted iron manufactured through the multi-stage fluidized furnace 100, the compacted iron manufacturing device 200, and the crushing device 300 must exceed demand quantity of high-temperature compacted iron necessary for the smelting furnace 500.
  • Equipment capacity excess rate (yield of high-temperature compacted iron)/(demand quantity of high-temperature compacted iron) ⁇ 100
  • the equipment capacity excess rate can be 110% to 120%.
  • the range of the equipment capacity excess rate is based on that a ratio of the time during which an abnormal condition occurs in the entire operation time is about 80% to 90% in an apparatus for manufacturing molten iron that directly uses fine or lump coal and fine iron-containing ores.
  • the reducing gas necessary for the multi-stage fluidized furnace 100 in order to manufacture the high-temperature compacted iron can be additionally supplied through a carbon dioxide removal device.
  • the time that the high-temperature compacted iron is taken to stay in the compacted iron storage tank 600 can be 6 hours to 12 hours.
  • high-temperature compacted iron may be stored in the compacted iron storage tank 600 excessively long. In this case, the high-temperature compacted iron can be cooled and erupted. As a result, in an abnormal condition, the constellation of the high-temperature compacted iron supplied to the smelting furnace 500 can be deteriorated.
  • high-temperature compacted iron stored at the lower part of the high-temperature compacted iron storage tank 600 may be partially discharged through the discharge devices 660, and the discharged high-temperature compacted iron may be periodically replaced with new high-temperature compacted iron manufactured and discharged through the multi-stage fluidized furnace 100, the compacted iron manufacturing device 200, and the crushing device 300.
  • the time that the high-temperature compacted iron is taken to stay in the compacted iron storage tank 600 is regularly maintained through a series of the replacement processes, and the stay time may be 6 hours to 12 hours.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
EP11842354.0A 2010-11-19 2011-11-18 Verfahren zur herstellung von geschmolzenem eisen Active EP2641981B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20100115554A KR101187851B1 (ko) 2010-11-19 2010-11-19 용철제조장치 및 이를 이용한 용철제조방법
PCT/KR2011/008842 WO2012067462A2 (ko) 2010-11-19 2011-11-18 용철제조장치 및 이를 이용한 용철제조방법

Publications (3)

Publication Number Publication Date
EP2641981A2 true EP2641981A2 (de) 2013-09-25
EP2641981A4 EP2641981A4 (de) 2017-08-30
EP2641981B1 EP2641981B1 (de) 2019-06-05

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EP11842354.0A Active EP2641981B1 (de) 2010-11-19 2011-11-18 Verfahren zur herstellung von geschmolzenem eisen

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EP (1) EP2641981B1 (de)
KR (1) KR101187851B1 (de)
CN (2) CN103221555B (de)
WO (1) WO2012067462A2 (de)

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DE102014111906A1 (de) 2014-08-20 2016-02-25 Maschinenfabrik Köppern Gmbh & Co. Kg Anlage zum Heißbrikettieren
EP3081654A4 (de) * 2013-12-10 2017-01-04 Posco Eisenschmelzeherstellungsverfahren und eisenschmelzeherstellungsvorrichtung

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KR101451405B1 (ko) * 2012-11-30 2014-10-15 주식회사 포스코 괴성광의 경화장치 및 이를 구비한 용철 제조장치
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CN107075592B (zh) * 2014-11-06 2020-01-10 株式会社Posco 复合铁水制备装置
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EP3081654A4 (de) * 2013-12-10 2017-01-04 Posco Eisenschmelzeherstellungsverfahren und eisenschmelzeherstellungsvorrichtung
DE102014111906A1 (de) 2014-08-20 2016-02-25 Maschinenfabrik Köppern Gmbh & Co. Kg Anlage zum Heißbrikettieren
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Also Published As

Publication number Publication date
EP2641981B1 (de) 2019-06-05
KR20120054262A (ko) 2012-05-30
KR101187851B1 (ko) 2012-10-04
CN103221555B (zh) 2015-07-15
WO2012067462A2 (ko) 2012-05-24
WO2012067462A3 (ko) 2012-08-23
CN103221555A (zh) 2013-07-24
CN104694687A (zh) 2015-06-10
EP2641981A4 (de) 2017-08-30

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