WO2012091407A2 - Apparatus for manufacturing molten steel, and method for manufacturing molten steel using same - Google Patents

Apparatus for manufacturing molten steel, and method for manufacturing molten steel using same Download PDF

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Publication number
WO2012091407A2
WO2012091407A2 PCT/KR2011/010151 KR2011010151W WO2012091407A2 WO 2012091407 A2 WO2012091407 A2 WO 2012091407A2 KR 2011010151 W KR2011010151 W KR 2011010151W WO 2012091407 A2 WO2012091407 A2 WO 2012091407A2
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WO
WIPO (PCT)
Prior art keywords
iron
rotary kiln
coal
reduced
ore
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PCT/KR2011/010151
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French (fr)
Korean (ko)
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WO2012091407A3 (en
Inventor
김성연
김희원
백찬준
최진식
Original Assignee
주식회사 포스코
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Priority to CN201180060164.8A priority Critical patent/CN103261445B/en
Priority to JP2013547331A priority patent/JP2014505169A/en
Publication of WO2012091407A2 publication Critical patent/WO2012091407A2/en
Publication of WO2012091407A3 publication Critical patent/WO2012091407A3/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B11/00—Making pig-iron other than in blast furnaces
    • C21B11/06—Making pig-iron other than in blast furnaces in rotary kilns
    • 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
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • 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
    • F27B7/32—Arrangement 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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/33—Arrangement of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • 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 relates to a molten iron manufacturing apparatus for producing molten iron and a molten iron manufacturing method using the same, and more particularly, a molten iron manufacturing apparatus for manufacturing molten iron by melting and reducing the reduced iron produced in a rotary kiln in an electric furnace and a molten iron manufacturing method using the same. It is about.
  • the carbon source used as a fuel and a reducing agent depends on the coke which processed the specific raw coal, and the iron source mainly depends on the sintered ore which passed through the series of agglomeration processes.
  • the current blast furnace process must be accompanied by raw material preliminary treatment equipment such as coke production equipment and sintering equipment, which is necessary to construct additional additional equipment in addition to the blast furnace equipment, which requires a huge cost for the equipment.
  • the present invention is to provide a molten iron manufacturing apparatus that can manufacture molten iron using low-cost raw materials in low cost and environmentally friendly, and a molten iron manufacturing method using the same.
  • a rotary kiln configured to reduce iron ore to produce reduced iron and an electric furnace for supplying the reduced iron produced by reducing in the rotary kiln to produce molten iron
  • the rotary kiln includes a body part configured to be reduced while moving iron ore therein, and one side of the body part is provided with a charging port for charging raw materials and fuels therein, and a gas discharge port for discharging gas, and on the opposite side, reduced iron is provided.
  • a molten iron manufacturing apparatus is provided with a discharge port for discharging, a combustion unit capable of performing pulverized coal injection and combustion, and a plurality of air inlets for introducing air therein.
  • the step of reducing the iron ore in the rotary kiln to produce reduced iron And supplying the reduced iron prepared as described above to an electric furnace to prepare a molten iron,
  • the reduced iron manufacturing step feeds iron ore, coal and limestone from one side of the body of the rotary kiln to the other side and moves to the other side.
  • a molten iron manufacturing method configured to be discharged after being reduced iron.
  • molten iron can be manufactured using low cost raw materials in low cost and environmentally friendly.
  • FIG. 1 is a schematic view showing an example of a molten iron manufacturing apparatus according to the present invention.
  • FIG. 2 is a schematic view showing an example of a rotary kiln of the molten iron manufacturing apparatus of the present invention.
  • the present invention relates to a molten iron manufacturing apparatus including a rotary kiln configured to reduce iron ore and an electric furnace for producing molten iron by receiving reduced iron produced by reducing the rotary kiln and a molten iron manufacturing method using the same.
  • Figure 1 shows an example of a molten iron manufacturing apparatus according to the present invention.
  • the molten iron manufacturing apparatus 1 of the present invention is supplied with a rotary kiln 10 configured to reduce iron ore to produce reduced iron and a reduced iron produced by reducing the rotary kiln 10.
  • An electric furnace 20 to manufacture is included.
  • the rotary kiln 20 of the present invention includes a body portion 11 configured to be reduced while moving iron ore therein, and the body portion 11 One side of the) is provided with an inlet 111 for charging the raw materials and fuels inside, a gas outlet 112 for discharging the gas, on the other side is a reduced iron outlet 113 for discharging the reduced iron and pulverized coal injection and combustion
  • the combustion part 114 which can be provided is provided.
  • Body portion 11 of the rotary kiln is provided with a plurality of air inlet 115 for introducing air into the interior.
  • the central portion of the rotary kiln in the longitudinal direction of the body portion 11 is provided with a coal charging port 1111 for charging coal.
  • the coal inlet 1111 is for supplying a reducing gas between the center portion and the tip portion in the body portion.
  • the length of the rotary kiln is preferably set to 130m or more.
  • the coal charging port 1111 may not be provided.
  • the molten iron manufacturing apparatus 1 includes an iron ore hopper 30 for receiving and supplying iron ore, and the iron ore hopper 30 is connected to iron ore communication through the raw material supply pipe 31 in the charging hole 111. .
  • the raw material supply pipe 31 and the coal storage hopper 50 for storing coal and the limestone supply pipe 41 connected to the limestone storage source (not shown) and the coal storage hopper 50 are stored in coal communication.
  • the coal supply pipe 51 connected by the relationship is connected.
  • a coal blocker 511 is provided in the coal supply pipe 51 between the coal storage hopper 50 and the raw material supply pipe 31.
  • the gas discharge port 112 is connected to the gas discharge pipe 131 for discharging the exhaust gas to the outside in a gas communication relationship, the first gas blower 1311, the first dust collector 1312, denitrification to the gas discharge pipe 131
  • the desulfurization apparatus 1313, the second dust collector 1314, and the second blower 1315 may be provided to remove impurities such as impurity gas or dust, and to facilitate gas discharge.
  • An end of the gas outlet 131 is connected to the stack 1316.
  • the electric furnace 20 is provided with an electrode rod 21 and an electric furnace exhaust gas discharge pipe 22.
  • the electrode 21 for example, three pairs of electrodes can be used.
  • the electric furnace exhaust gas discharge pipe 22 is connected to the iron ore hopper 30, and the electric furnace exhaust gas discharge pipe 22 between the electric furnace 20 and the iron ore hopper 30 is provided with a third dust collector 221. have.
  • the electric furnace 20 is provided with an outlet for discharging slag and an outlet for discharging molten iron.
  • an outlet for discharging slag for example, it is preferable to provide two upper outlets and two outlets.
  • the rotary kiln 10 and the electric furnace 20 may be connected in a reduced iron communication relationship through a reduced iron supply pipe 116, in this case, the reduced iron supply pipe 116 may be provided with a reduced iron agglomeration apparatus (1161). .
  • iron ore, coal, and limestone are supplied and moved inside through the charging holes 111 of the body part 11 of the rotary kiln 10, and the pulverized coal is injected and burned in the combustion unit 114, and air Supplying air into the body portion through the inlet 115 to reduce the iron ore is moved to reduce iron is produced.
  • the reduction gas generated by the coal is supplied between the center portion and the tip portion of the body portion, thereby increasing the reduction rate.
  • iron ore ferrite or lump or mixed light thereof may be used.
  • iron ore having a particle size of 8 to 22 mm can be used, and more preferably, when using a particle size of 8 to 12 mm, the metallization rate can be operated by 94% or more.
  • iron ore for example, T.Fe: 66.3% by weight, SiO 2 : 3.15% by weight, Al 2 O 3 : 1.20% by weight, K 2 O: 0.09% by weight, P: 0.06% by weight and S: 0.019% by weight Iron ores containing% can be used.
  • the coal serves as a carbon source such as ore reduction, the particle size is preferably about 6 ⁇ 16mm, and is mixed with the ore at the inlet of the rotary kiln.
  • the pulverized coal is blown in order to maintain the temperature of the free space zone of the rotary kiln by blowing at the bottom of the rotary kiln, the particle size of which is preferably 6 mm or less, and more preferably 2 to 6 mm is 70 to 80 %, And less than 2mm has a particle size of about 20 to 30%.
  • the amount of pulverized coal used in the combustion unit may vary depending on the temperature of the free space zone.
  • the limestone is supplied for desulfurization of coal, and for example, 1 to 3 mm of dolomite is mixed with ore and coal at the inlet of the rotary kiln and charged.
  • the limestone is converted to quicklime (CaCO 3 + heat ⁇ CaO + CO 2 ), contributing to the reduction of S in the molten iron during the melting process in the electric furnace.
  • the main reaction mechanism in the ore + coal bed in the body of the rotary kiln is as follows.
  • Free Space Zone is an area that supplies heat by exothermic reaction while CO gas is combusted by air input and maintains temperature 900 ⁇ 1200 °C to maintain iron ore indirect reducing atmosphere by CO gas. do.
  • the temperature of the free space zone of the rear end portion from which the exhaust gas is discharged is preferably maintained at 900 to 1000 ° C, and the temperature of the free space zone of the front end portion to which the pulverized coal is supplied is preferably maintained to 900 to 1200 ° C.
  • Reduction of the ore in the bed is indirect reduction by CO gas is more concentrated than direct reduction by carbon in the atmosphere temperature distribution, it is preferable that the ambient temperature is maintained at about 1,000 ⁇ 1,100 °C so that the C + CO 2 ⁇ 2CO reaction is activated.
  • the exhaust gas generated during the production of reduced iron includes a gas outlet 112, a gas discharge pipe 113, a first blower 1311, a first dust collector 1312, a denitrification desulfurization device 1313, a second dust collector 1314, and a second
  • the air is discharged to the atmosphere via the blower 1315 and the stack 1316.
  • the reduced iron produced as described above is supplied to the electric furnace 20 through, for example, a reduced iron supply pipe 116 to produce molten iron.
  • the reduced iron is agglomerated by the reduced iron agglomeration apparatus (1161) may be charged in the electric furnace (20).
  • the electric furnace 20 is supplied with molten iron at a high temperature of 950-1000 ° C. to melt and further reduce to manufacture molten iron.
  • the reduced iron is melted through an electrode rod 21 immersed in the slag layer of the electric furnace 20, for example, three pairs of electrode rods, and at the same time, the residual iron oxide is reduced by a certain amount of coal in the reduced iron, S is removed from the molten iron by CaO contained (CaO + FeS + C ⁇ CaS + Fe + CO).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Iron (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

Provided are an apparatus for manufacturing molten steel and a method for manufacturing molten steel using same. The apparatus for manufacturing molten steel includes a rotary kiln configured to reduce iron ore to form reduced iron, and an electric furnace receiving the reduced iron manufactured in the rotary kiln in order to manufacture the molten steel. The rotary kiln includes a body part into which the iron ore is moved and a in which the iron ore is reduced. A loading hole through which raw material and fuel are loaded, and a gas discharge hole for discharging gas, are defined in one side of the body part; and a discharge hole for discharging the reduced iron, and a combustion part in which pulverized coal injection and combustion are performed, are disposed in the other side of the body part. Also, the body part has a plurality of air inflow holes through which air is introduced.

Description

용선제조장치 및 이를 이용한 용선제조방법Charter manufacturing apparatus and charter manufacturing method using the same
본 발명은 용선을 제조하는 용선제조장치 및 이를 이용한 용선제조방법에 관한 것으로서, 보다 상세하게는 로터리 킬른에서 제조된 환원철을 전기로에서 용융및 환원시켜 용선을 제조하는 용선제조장치 및 이를 이용한 용선제조방법에 관한 것이다.The present invention relates to a molten iron manufacturing apparatus for producing molten iron and a molten iron manufacturing method using the same, and more particularly, a molten iron manufacturing apparatus for manufacturing molten iron by melting and reducing the reduced iron produced in a rotary kiln in an electric furnace and a molten iron manufacturing method using the same. It is about.
현재 용선제조에 있어서 에너지 효율면이나 생산성 측면에서 고로공정을 능가하는 제선공정은 개발되지 않고 있다.At present, there has not been developed a steelmaking process that surpasses the blast furnace process in terms of energy efficiency and productivity.
이와 같은 고로공정에서는 연료 및 환원제로 사용하는 탄소원으로서 특정 원료탄을 가공처리한 코크스에 의존하고, 그리고 철원으로서는 일련의 괴상화 공정을 거친 소결광에 주로 의존하고 있다. In such a blast furnace process, the carbon source used as a fuel and a reducing agent depends on the coke which processed the specific raw coal, and the iron source mainly depends on the sintered ore which passed through the series of agglomeration processes.
따라서, 현재의 고로공정은 코크스 제조설비 및 소결설비 등의 원료예비처리설비를 반드시 수반하여야 하며, 이는 결국 고로설비이외에 추가적인 부대설비의 구축이 필수적으로 필요하여 설비를 위한 막대한 비용이 소요된다.Therefore, the current blast furnace process must be accompanied by raw material preliminary treatment equipment such as coke production equipment and sintering equipment, which is necessary to construct additional additional equipment in addition to the blast furnace equipment, which requires a huge cost for the equipment.
또한, 상기와 같은 원료예비처리설비에서는 SOx, NOx 또는 분진과 같은 환경오염물질이 상당히 발생되기 때문에, 이의 정화처리를 위한 별도의 설비가 필요하고, 특히 현재 세계적으로 환경오염에 대한 규제가 엄격해져 가고 있어 이를 극복하기 위한 막대한 처리설비 투자비용 등으로 현재의 고로공정을 통한 용선의 생산에서는 그 경쟁력은 저하되고 있는 실정이다. In addition, in the raw material preliminary treatment facilities, since environmental pollutants such as SOx, NOx, or dust are generated considerably, a separate facility for the purification treatment is required, and in particular, the regulations on environmental pollution are now strict in the world. Due to the enormous cost of investment in processing equipment to overcome this problem, the competitiveness of the molten iron in the current blast furnace process is falling.
따라서, 이러한 고로공정에서 발생되는 문제를 해결하기 위하여 많은 다른 공정의 연구 및 개발이 진행되고 있다.Therefore, research and development of many other processes are in progress in order to solve the problems occurring in the blast furnace process.
본 발명은 저비용이고 친환경적으로 저급원료를 사용하여 용선을 제조할 수 있는 용선제조장치 및 이를 이용한 용선제조방법을 제공하고자 하는 것이다.The present invention is to provide a molten iron manufacturing apparatus that can manufacture molten iron using low-cost raw materials in low cost and environmentally friendly, and a molten iron manufacturing method using the same.
이하, 본 발명에 대하여 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.
본 발명의 일측면에 의하면, 철광석을 환원하여 환원철을 제조하도록 구성되는 로터리 킬른 및 이 로터리 킬른에서 환원하여 제조된 환원철을 공급받아 용선을 제조하는 전기로를 포함하고,According to one aspect of the present invention, a rotary kiln configured to reduce iron ore to produce reduced iron and an electric furnace for supplying the reduced iron produced by reducing in the rotary kiln to produce molten iron,
상기 로터리 킬른은 내부에서 철광석이 이동하면서 환원되도록 구성되는 몸체부를 포함하고, 이 몸체부의 한쪽에는 원료 및 연료들을 내부로 장입시키는 장입구, 가스를 배출하는 가스배출구가 구비되어 있고, 반대쪽에는 환원철을 배출하는 배출구 및 미분탄분사 및 연소를 실시할 수 있는 연소부가 구비되어 있고, 그리고 내부로 공기를 도입하는 다수개의 공기도입구가 구비되어 있는 용선제조장치가 제공된다.The rotary kiln includes a body part configured to be reduced while moving iron ore therein, and one side of the body part is provided with a charging port for charging raw materials and fuels therein, and a gas discharge port for discharging gas, and on the opposite side, reduced iron is provided. A molten iron manufacturing apparatus is provided with a discharge port for discharging, a combustion unit capable of performing pulverized coal injection and combustion, and a plurality of air inlets for introducing air therein.
본 발명의 다른 측면에 의하면, 로터리 킬른에서 철광석을 환원하여 환원철을 제조하는 단계; 및 상기와 같이 제조된 환원철을 전기로에 공급하여 용선을 제조하는 단계를 포함하고,According to another aspect of the invention, the step of reducing the iron ore in the rotary kiln to produce reduced iron; And supplying the reduced iron prepared as described above to an electric furnace to prepare a molten iron,
상기 환원철 제조단계가 로터리 킬른의 몸체부의 한 쪽에서 철광석, 석탄 및 석회석을 내부로 공급하여 반대쪽으로 이동시키고, 반대쪽에서는 미분탄 분사 및 연소를 실시하고, 몸체부 내부로 공기를 공급하여 철광석이 이동하면서 환원되어 환원철로 된 후 배출되도록 구성되는 용선제조방법이 제공된다.The reduced iron manufacturing step feeds iron ore, coal and limestone from one side of the body of the rotary kiln to the other side and moves to the other side. There is provided a molten iron manufacturing method configured to be discharged after being reduced iron.
본 발명에 의하면, 저비용이고 친환경적으로 저급원료를 사용하여 용선을 제조할 수 있다.According to the present invention, molten iron can be manufactured using low cost raw materials in low cost and environmentally friendly.
도 1은 본 발명에 부합되는 용선제조장치의 일례를 나타내는 개략도이다.1 is a schematic view showing an example of a molten iron manufacturing apparatus according to the present invention.
도 2는 본 발명의 용선제조장치의 로터리 킬른의 일례를 나타내는 개략도이다.2 is a schematic view showing an example of a rotary kiln of the molten iron manufacturing apparatus of the present invention.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명은 철광석을 환원하여 환원철을 제조하도록 구성되는 로터리 킬른 및 이 로터리 킬른에서 환원하여 제조된 환원철을 공급받아 용선을 제조하는 전기로를 포함하는 용선제조장치 및 이를 이용한 용선제조방법에 관한 것이다.The present invention relates to a molten iron manufacturing apparatus including a rotary kiln configured to reduce iron ore and an electric furnace for producing molten iron by receiving reduced iron produced by reducing the rotary kiln and a molten iron manufacturing method using the same.
이하, 도면을 통하여 본 발명을 설명한다.Hereinafter, the present invention will be described with reference to the drawings.
도 1에는 본 발명에 부합되는 용선제조장치의 일례가 도시되어 있다.Figure 1 shows an example of a molten iron manufacturing apparatus according to the present invention.
도 1에 나타난 바와 같이, 본 발명의 용선제조장치(1)은 철광석을 환원하여 환원철을 제조하도록 구성되는 로터리 킬른(10) 및 이 로터리 킬른(10)에서 환원하여 제조된 환원철을 공급받아 용선을 제조하는 전기로(20)를 포함한다.As shown in FIG. 1, the molten iron manufacturing apparatus 1 of the present invention is supplied with a rotary kiln 10 configured to reduce iron ore to produce reduced iron and a reduced iron produced by reducing the rotary kiln 10. An electric furnace 20 to manufacture is included.
본 발명의 로터리 킬른의 일례를 도시한 도 2에 나타난 바와 같이, 본 발명의 로터리 킬른(20)은 내부에서 철광석이 이동하면서 환원되도록 구성되는 몸체부(11)를 포함하고, 이 몸체부(11)의 한쪽에는 원료 및 연료들을 내부로 장입시키는 장입구(111), 가스를 배출하는 가스배출구(112)가 구비되어 있고, 반대쪽에는 환원철을 배출하는 환원철 배출구(113) 및 미분탄분사 및 연소를 실시할 수 있는 연소부(114)가 구비되어 있다.As shown in FIG. 2 showing an example of the rotary kiln of the present invention, the rotary kiln 20 of the present invention includes a body portion 11 configured to be reduced while moving iron ore therein, and the body portion 11 One side of the) is provided with an inlet 111 for charging the raw materials and fuels inside, a gas outlet 112 for discharging the gas, on the other side is a reduced iron outlet 113 for discharging the reduced iron and pulverized coal injection and combustion The combustion part 114 which can be provided is provided.
상기 로터리 킬른의 몸체부(11)에는 내부로 공기를 도입하는 다수개의 공기도입구(115)가 구비되어 있다. Body portion 11 of the rotary kiln is provided with a plurality of air inlet 115 for introducing air into the interior.
상기 로터리 킬른의 몸체부(11)의 길이방향으로 대략 중앙부에는 석탄을 장입하기 위한 석탄장입구(1111)가 구비되어 있다.The central portion of the rotary kiln in the longitudinal direction of the body portion 11 is provided with a coal charging port 1111 for charging coal.
상기 석탄장입구(1111)는 몸체부내의 중앙부와 선단부 사이에 환원가스를 공급하기 위한 것이다.The coal inlet 1111 is for supplying a reducing gas between the center portion and the tip portion in the body portion.
상기 로터리 킬른의 길이는 130m이상으로 설정하는 것이 바람직하다.The length of the rotary kiln is preferably set to 130m or more.
상기 로터리 킬른의 길이가 짧을 경우에는 즉, 상기 장입구(111)로 공급되는 석탄에 의해 환원가스를 충분히 공급해 줄 수 있는 경우에는 석탄장입구(1111)를 구비시키지 않을 수도 있다.In the case where the length of the rotary kiln is short, that is, when the reducing gas can be sufficiently supplied by the coal supplied to the charging port 111, the coal charging port 1111 may not be provided.
상기 용선제조장치(1)는 철광석을 수용하고 공급하는 철광석 호퍼(30)를 포함하며, 상기 철광석 호퍼(30)는 원료공급관(31)을 통해 장입구(111)에 철광석 소통관계로 연결되어 있다.The molten iron manufacturing apparatus 1 includes an iron ore hopper 30 for receiving and supplying iron ore, and the iron ore hopper 30 is connected to iron ore communication through the raw material supply pipe 31 in the charging hole 111. .
상기 원료공급관(31)에는 상기 철광석 호퍼(30) 이외에도 석회석 저장원(도시도어 있지 않음)에 석회석 소통관계로 연결되어 있는 석회석 공급관(41) 및 석탄을 저장하는 석탄저장호퍼(50)와 석탄 소통관계로 연결되어 있는 석탄공급관(51)이 연결되어 있다.In addition to the iron ore hopper 30, the raw material supply pipe 31 and the coal storage hopper 50 for storing coal and the limestone supply pipe 41 connected to the limestone storage source (not shown) and the coal storage hopper 50 are stored in coal communication. The coal supply pipe 51 connected by the relationship is connected.
상기 석탄저장호퍼(50)와 원료공급관(31)사이의 석탄공급관(51)에는 석탄괴상화장치(511)가 구비되어 있다.A coal blocker 511 is provided in the coal supply pipe 51 between the coal storage hopper 50 and the raw material supply pipe 31.
상기 가스배출구(112)에는 배가스를 외부로 배출하기 위한 가스배출관(131)이 가스소통관계로 연결되어 있으며, 이 가스배출관(131)에는 제1송풍기(1311), 제1집진기(1312), 탈질탈황장치(1313), 제2집진기(1314) 및 제2송풍기(1315)들이 구비될 수 있어, 불순가스나 분진 등과 같은 불순물을 제거하고 가스의 배출이 용이하도록 할 수 있다.The gas discharge port 112 is connected to the gas discharge pipe 131 for discharging the exhaust gas to the outside in a gas communication relationship, the first gas blower 1311, the first dust collector 1312, denitrification to the gas discharge pipe 131 The desulfurization apparatus 1313, the second dust collector 1314, and the second blower 1315 may be provided to remove impurities such as impurity gas or dust, and to facilitate gas discharge.
상기 가스배출구(131)의 말단은 연돌(1316)과 연결되어 있다.An end of the gas outlet 131 is connected to the stack 1316.
상기 전기로(20)에는 전극봉(21) 및 전기로 배가스 배출관(22)이 구비되어 있다.The electric furnace 20 is provided with an electrode rod 21 and an electric furnace exhaust gas discharge pipe 22.
상기 전극봉(21)으로는 예를 들면, 3쌍의 전극봉을 사용할 수 있다.As the electrode 21, for example, three pairs of electrodes can be used.
상기 전기로 배가스 배출관(22)은 철광석 호퍼(30)에 연결되어 있으며, 상기 전기로(20)와 철광석 호퍼(30)사이의 전기로 배가스 배출관(22)에는 제3집진기(221)가 구비되어 있다.The electric furnace exhaust gas discharge pipe 22 is connected to the iron ore hopper 30, and the electric furnace exhaust gas discharge pipe 22 between the electric furnace 20 and the iron ore hopper 30 is provided with a third dust collector 221. have.
상기 전기로(20)에는 슬래그를 배제하는 출재구 및 용선을 배출하는 출선구가 구비되어 있으며, 예를 들면, 상부 출재구 및 하부 출선구 각 2개씩 구비시키는 것이 바람직하다.The electric furnace 20 is provided with an outlet for discharging slag and an outlet for discharging molten iron. For example, it is preferable to provide two upper outlets and two outlets.
상기 로터리 킬른(10)과 전기로(20)는 환원철 공급관(116)을 통해 환원철 소통관계로 연결될 수 있으며, 이러한 경우에는 상기 환원철 공급관(116)에는 환원철 괴상화장치(1161)을 구비시킬 수 있다.The rotary kiln 10 and the electric furnace 20 may be connected in a reduced iron communication relationship through a reduced iron supply pipe 116, in this case, the reduced iron supply pipe 116 may be provided with a reduced iron agglomeration apparatus (1161). .
이하, 본 발명에 따라 용선을 제조하는 방법을 도 1 및 도 2를 참조하여 설명한다.Hereinafter, a method of manufacturing molten iron according to the present invention will be described with reference to FIGS. 1 and 2.
본 발명에서는 도 1에 나타난 바와 같이 용선을 제조하기 위하여 먼저 로터리 킬른(10)에서 철광석을 환원하여 환원철을 제조한다.In the present invention, to reduce the iron ore in the rotary kiln (10) to produce molten iron as shown in Figure 1 to produce reduced iron.
즉, 상기 로터리 킬른(10)의 몸체부(11)의 장입구(111)를 통해 철광석, 석탄 및 석회석을 내부로 공급하여 이동시키고, 연소부(114)에서 미분탄 분사 및 연소를 실시하고, 공기도입구(115)를 통해 몸체부 내부로 공기를 공급하여 철광석이 이동하면서 환원되어 환원철이 제조된다.That is, iron ore, coal, and limestone are supplied and moved inside through the charging holes 111 of the body part 11 of the rotary kiln 10, and the pulverized coal is injected and burned in the combustion unit 114, and air Supplying air into the body portion through the inlet 115 to reduce the iron ore is moved to reduce iron is produced.
이 때, 상기 로터리 킬른의 길이가 긴 경우에는 몸체부(11)의 길이방향으로 대략 중앙부에 구비되어 석탄장입구(1111)를 통해 석탄을 장입할 수 있다.At this time, when the length of the rotary kiln is long is provided in the center portion in the longitudinal direction of the body portion 11 can be charged coal through the coal charging port 1111.
상기와 같이, 석탄장입구(1111)를 석탄을 장입하는 경우에는 몸체부내의 중앙부와 선단부 사이에 석탄에 의해 발생하는 환원가스를 공급하게 되므로 환원율을 높일 수 있다.As described above, in the case of charging the coal into the coal inlet 1111, the reduction gas generated by the coal is supplied between the center portion and the tip portion of the body portion, thereby increasing the reduction rate.
상기 철광석으로는 분철광 또는 괴광 또는 이들의 혼합광을 사용할 수 있다.As the iron ore, ferrite or lump or mixed light thereof may be used.
예를 들면, 입도 8~22mm의 철광석을 사용할 수 있고, 보다 바람직하게는 입도 8~12mm의 사용하는 경우에는 금속화율 94% 이상 조업을 할 수 있다.For example, iron ore having a particle size of 8 to 22 mm can be used, and more preferably, when using a particle size of 8 to 12 mm, the metallization rate can be operated by 94% or more.
상기 철광석으로는 예를 들면, T.Fe: 66.3중량%, SiO2: 3.15중량%, Al2O3: 1.20중량%, K2O: 0.09중량%, P: 0.06중량% 및 S: 0.019중량%를 함유하는 철광석을 사용할 수 있다.As the iron ore, for example, T.Fe: 66.3% by weight, SiO 2 : 3.15% by weight, Al 2 O 3 : 1.20% by weight, K 2 O: 0.09% by weight, P: 0.06% by weight and S: 0.019% by weight Iron ores containing% can be used.
상기 석탄은 광석 환원 등 탄소 공급원 역할을 하는 것으로서 그 입도는 대략 6~16mm 정도가 바람직하며, 로터리 킬른 입구에서 광석과 혼합하여 장입된다.The coal serves as a carbon source such as ore reduction, the particle size is preferably about 6 ~ 16mm, and is mixed with the ore at the inlet of the rotary kiln.
상기 미분탄은 로터리 킬른 하단에서 취입하여 로터리 킬른의 프리 스페이스 죤 (Free Space Zone)의 온도를 유지하기 위해 취입하는 것으로, 그 입도는 6mm 이하가 바람직하며, 보다 바람직하게는 2~6mm가 70~80%이고, 2mm이하가 20~30% 정도인 입도를 갖는 것이다.The pulverized coal is blown in order to maintain the temperature of the free space zone of the rotary kiln by blowing at the bottom of the rotary kiln, the particle size of which is preferably 6 mm or less, and more preferably 2 to 6 mm is 70 to 80 %, And less than 2mm has a particle size of about 20 to 30%.
상기 연소부에서의 미분탄 사용량은 프리 스페이스 죤의 온도에 따라 변화될 수 있다.The amount of pulverized coal used in the combustion unit may vary depending on the temperature of the free space zone.
상기 석회석은 석탄의 탈황을 위하여 공급되는 것으로서, 예를 들면, 1~3mm의 돌로마이트를 로터리 킬른 입구측에서 광석, 석탄과 혼합하여 장입한다.The limestone is supplied for desulfurization of coal, and for example, 1 to 3 mm of dolomite is mixed with ore and coal at the inlet of the rotary kiln and charged.
상기 석회석은 생석회로 변환되어(CaCO3 + 열 → CaO + CO2), 전기로에서 용융과정중 용선 중 S를 저감시키는데 기여한다.The limestone is converted to quicklime (CaCO 3 + heat → CaO + CO 2 ), contributing to the reduction of S in the molten iron during the melting process in the electric furnace.
상기 로터리 킬른의 몸체부 내의 광석 + 석탄베드(Coal Bed)내 주요 반응 메카니즘(Mechanism)은 다음과 같다.The main reaction mechanism in the ore + coal bed in the body of the rotary kiln is as follows.
C + CO2 → 2COC + CO 2 → 2CO
3Fe2O3 + CO → 2Fe3O4 + CO2 3Fe 2 O 3 + CO → 2Fe 3 O 4 + CO 2
Fe3O4 + CO → 3FeO + CO2 Fe 3 O 4 + CO → 3FeO + CO 2
FeO + CO → Fe + CO2 FeO + CO → Fe + CO 2
프리 스페이스 죤(Free Space Zone)은 공기(Air) 투입에 의해 CO 가스가 연소하면서 발열반응에 의해 열을 공급하는 영역으로서, 온도를 900 ~ 1200 ℃ 유지하여 CO가스에 의한 철광석 간접환원 분위기를 유지한다.Free Space Zone is an area that supplies heat by exothermic reaction while CO gas is combusted by air input and maintains temperature 900 ~ 1200 ℃ to maintain iron ore indirect reducing atmosphere by CO gas. do.
배가스가 배출되는 후단부의 프리 스페이스 죤의 온도는 900 ~ 1000 ℃로 유지하는 것이 바람직하고, 미분탄이 공급되는 선단부의 프리 스페이스 죤의 온도는 900 ~ 1200 ℃로 유지하는 것이 바람직하다.It is preferable to maintain the temperature of the free space zone of the rear end portion from which the exhaust gas is discharged at 900 to 1000 ° C, and the temperature of the free space zone of the front end portion to which the pulverized coal is supplied is preferably maintained to 900 to 1200 ° C.
상기 베드내 광석의 환원은 분위기 온도 분포상 탄소에 의한 직접환원 보다 CO 가스에 의한 간접환원이 집중적으로 일어나며, C+CO2 → 2CO 반응이 활성화되도록 분위기 온도는 1,000 ~1,100 ℃ 정도로 유지되는 것이 바람직하다Reduction of the ore in the bed is indirect reduction by CO gas is more concentrated than direct reduction by carbon in the atmosphere temperature distribution, it is preferable that the ambient temperature is maintained at about 1,000 ~ 1,100 ℃ so that the C + CO 2 → 2CO reaction is activated.
상기 환원철 제조시 발생되는 배가스는 가스배출구(112),가스배출관(113), 제1송풍기(1311), 제1집진기(1312), 탈질탈황장치(1313), 제2집진기(1314), 제2송풍기(1315) 및 연돌(1316)을 거쳐 대기로 배출된다.The exhaust gas generated during the production of reduced iron includes a gas outlet 112, a gas discharge pipe 113, a first blower 1311, a first dust collector 1312, a denitrification desulfurization device 1313, a second dust collector 1314, and a second The air is discharged to the atmosphere via the blower 1315 and the stack 1316.
다음에, 상기와 같이 제조된 환원철을, 예를 들면, 환원철 공급관(116)을 통해 전기로(20)에 공급하여 용선을 제조한다. 이때, 환원철은 환원철 괴상화장치(1161)에 의해 괴상화되어 전기로(20)에 장입될 수 있다.Next, the reduced iron produced as described above is supplied to the electric furnace 20 through, for example, a reduced iron supply pipe 116 to produce molten iron. At this time, the reduced iron is agglomerated by the reduced iron agglomeration apparatus (1161) may be charged in the electric furnace (20).
상기 전기로(20)에서는 950~1000℃ 수준의 고온의 환원철을 공급받아 용융하고 추가 환원하여 용선을 제조한다.The electric furnace 20 is supplied with molten iron at a high temperature of 950-1000 ° C. to melt and further reduce to manufacture molten iron.
전기로(20)의 슬래그 층에 잠긴 전극봉(21), 예를 들면, 3쌍의 전극봉을 통해 환원철을 용융하고, 용융과 동시에 환원철내부의 일정량의 석탄에 의해 잔류 철산화물이 환원되고, 환원철에 함유된 CaO에 의해 용선 중 S를 제거한다(CaO + FeS + C → CaS + Fe + CO).The reduced iron is melted through an electrode rod 21 immersed in the slag layer of the electric furnace 20, for example, three pairs of electrode rods, and at the same time, the residual iron oxide is reduced by a certain amount of coal in the reduced iron, S is removed from the molten iron by CaO contained (CaO + FeS + C → CaS + Fe + CO).
(부호의 설명)(Explanation of the sign)
1: 용선제조장치1: molten iron manufacturing apparatus
10: 로터리 킬른10: rotary kiln
20: 전기로20: electric furnace
30: 철광석 호퍼30: Iron Ore Hopper
50: 석탄저장호퍼50: Coal Storage Hopper
11: 몸체부11: body
111: 장입구111: charging
112: 가스배출구112: gas outlet
113: 환원철 배출구113: reduced iron outlet
114: 연소부114: combustion section
115: 공기도입구115: air inlet
21: 전극봉21: electrode
22: 전기로배가스배출관22: electric furnace exhaust pipe

Claims (9)

  1. 철광석을 환원하여 환원철을 제조하도록 구성되는 로터리 킬른 및 이 로터리 킬른에서 환원하여 제조된 환원철을 공급받아 용선을 제조하는 전기로를 포함하고,A rotary kiln configured to reduce iron ore to produce reduced iron, and an electric furnace for producing molten iron by receiving reduced iron produced by reduction in the rotary kiln,
    상기 로터리 킬른은 내부에서 철광석이 이동하면서 환원되도록 구성되는 몸체부를 포함하고, 이 몸체부의 한쪽에는 원료 및 연료들을 내부로 장입시키는 장입구 및 가스를 배출하는 가스배출구가 구비되어 있고, 반대쪽에는 환원철을 배출하는 배출구 및 미분탄분사 및 연소를 실시할 수 있는 연소부가 구비되어 있고, 그리고 내부로 공기를 도입하는 다수개의 공기도입구가 구비되어 있는 용선제조장치.The rotary kiln includes a body part configured to be reduced while moving iron ore therein, and one side of the body part is provided with a charging inlet for charging raw materials and fuels therein and a gas outlet for discharging gas, and an opposite side of the reducing iron A molten iron manufacturing apparatus provided with the discharge port which discharges, the combustion part which can perform pulverized coal injection and combustion, and the several air inlet which introduces air into it.
  2. 제1항에 있어서, 상기 몸체부의 길이방향 중앙부에는 석탄을 장입하기 위한 석탄장입구가 구비되어 있는 것을 특징으로 하는 용선제조장치.The molten iron manufacturing apparatus according to claim 1, wherein the longitudinal center portion of the body portion is provided with a coal charging hole for charging coal.
  3. 로터리 킬른에서 철광석을 환원하여 환원철을 제조하는 단계; 및 상기와 같이 제조된 환원철을 전기로에 공급하여 용선을 제조하는 단계를 포함하고,Reducing iron ore in a rotary kiln to produce reduced iron; And supplying the reduced iron prepared as described above to an electric furnace to prepare a molten iron,
    상기 환원철 제조단계가 로터리 킬른의 몸체부의 한 쪽에서 철광석, 석탄 및 석회석을 내부로 공급하여 반대쪽으로 이동시키고, 반대쪽에서는 미분탄 분사 및 연소를 실시하고, 그리고 몸체부 내부로 공기를 공급하여 철광석이 이동하면서 환원되어 환원철로 된 후 배출되도록 구성되는 용선제조방법.The reduced iron manufacturing step feeds iron ore, coal and limestone from one side of the body of the rotary kiln to the other side and moves to the other side, and conducts pulverized coal injection and combustion, and supplies air into the body to move the iron ore. The molten iron manufacturing method is configured to be discharged after being reduced to reduced iron.
  4. 제3항에 있어서, 상기 몸체부의 길이방향 중앙부에서 석탄을 공급하는 것을 특징으로 하는 용선제조방법.4. The method of claim 3, wherein coal is supplied from the central portion in the longitudinal direction of the body portion.
  5. 제3항에 있어서, 상기 철광석이 분철광, 괴광 또는 이들의 혼합광인 것을 특징으로 하는 용선제조방법.4. The method of claim 3, wherein the iron ore is iron ore, ore or mixed light thereof.
  6. 제3항에 있어서, 상기 철광석의 입도가 8~22mm이고, 상기 석탄의 입도는 6~16mm이고, 그리고 상기 미분탄의 입도는 6mm이하인 것을 특징으로 하는 용선제조방법.The molten iron manufacturing method according to claim 3, wherein the iron ore has a particle size of 8 to 22 mm, the coal particle size is 6 to 16 mm, and the pulverized coal is 6 mm or less.
  7. 제3항에 있어서, 프리 스페이스 죤(Free Space Zone)의 온도가 900 ~ 1200℃ 인 것을 특징으로 하는 용선제조방법.The method of claim 3, wherein the free space zone has a temperature of 900 to 1200 ° C.
  8. 제7항에 있어서, 배가스가 배출되는 몸체부의 후단부의 프리 스페이스 죤의 온도는 900 ~ 1000℃이고, 그리고 미분탄이 공급되는 몸체부의 선단부의 프리 스페이스 죤의 온도는 900 ~ 1200℃인 것을 특징으로 하는 용선제조방법.The temperature of the free space zone at the rear end of the body portion through which exhaust gas is discharged is 900 to 1000 ° C, and the temperature of the free space zone at the tip of the body portion to which pulverized coal is supplied is 900 to 1200 ° C. Charter production method.
  9. 제3항에서 제8항중의 어느 한 항에 있어서, 상기 전기로(20)에 공급되는 환원철의 온도가 950 ~ 1000℃인 것을 특징으로 하는 용선제조방법.The method of any one of claims 3 to 8, characterized in that the temperature of the reduced iron supplied to the electric furnace (20) is 950 ~ 1000 ℃.
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