KR20040056306A - Method for improving calcination degree of additives in ironmaking process with compaction facility - Google Patents
Method for improving calcination degree of additives in ironmaking process with compaction facility Download PDFInfo
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- KR20040056306A KR20040056306A KR1020020082909A KR20020082909A KR20040056306A KR 20040056306 A KR20040056306 A KR 20040056306A KR 1020020082909 A KR1020020082909 A KR 1020020082909A KR 20020082909 A KR20020082909 A KR 20020082909A KR 20040056306 A KR20040056306 A KR 20040056306A
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- Prior art keywords
- reduced
- iron
- fluidized bed
- briquettes
- molten iron
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- 238000000034 method Methods 0.000 title description 21
- 238000001354 calcination Methods 0.000 title description 11
- 239000000654 additive Substances 0.000 title 1
- 238000005056 compaction Methods 0.000 title 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 134
- 229910052742 iron Inorganic materials 0.000 claims abstract description 56
- 238000002844 melting Methods 0.000 claims abstract description 43
- 230000008018 melting Effects 0.000 claims abstract description 43
- 239000002994 raw material Substances 0.000 claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 claims abstract description 36
- 239000000428 dust Substances 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 8
- 238000009826 distribution Methods 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 25
- 239000004484 Briquette Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 238000010304 firing Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 description 17
- 239000010802 sludge Substances 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000009628 steelmaking Methods 0.000 description 8
- 235000019738 Limestone Nutrition 0.000 description 7
- 239000006028 limestone Substances 0.000 description 7
- 239000000446 fuel Substances 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- 239000010459 dolomite Substances 0.000 description 4
- 229910000514 dolomite Inorganic materials 0.000 description 4
- 238000011946 reduction process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012256 powdered iron Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NJFMNPFATSYWHB-UHFFFAOYSA-N ac1l9hgr Chemical compound [Fe].[Fe] NJFMNPFATSYWHB-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0086—Conditioning, transformation of reduced iron ores
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
Abstract
부원료의 소성율을 제어할 수 있는 용선제조방법이 제공된다.A molten iron manufacturing method which can control the firing rate of an auxiliary material is provided.
본 발명은, 입도분포가 넓은 분철광석과 부원료를 유동환원시키는 1단 또는 2단 이상의 반응기로 구성된 유동층환원로(200), 상기 유동층환원로에서 환원되어 배출되는 부원료를 함유하는 분환원철을 저장하는 괴성화기 장입호퍼(300), 상기 장입호퍼 (300)으로부터 공급받은 분환원철로부터 단광으로 제조하는 괴성화기(310), 상기 괴성화기에서 괴성화된 다열의 단광을 개개의 단광으로 분리하는 분리기(320), 상기 분리기에서 분리된 단광을 용융시켜 용선을 생산하고 그 배가스를 상기 유동층환원로의 환원가스로 공급하는 용융로(500) 및 상기 용융로에서 발생하는 배가스를 포집하여 더스트는 용융로에 재공급하고 가스는 유동층환원로의 환원가스로 공급하는 용융로 사이클론(510)를 포함하여 구성되는 용선제조장치를 이용하는 용선제조공정에 있어서, 상기 유동층로부터 배출된 부원료를 함유한 분환원철을 질소가스 분위기와 650 ~ 800℃의 온도를 갖는 괴성화기 장입호퍼(300)내에서 30~60분 체류시킴을 특징으로 한다.The present invention, the fluidized bed reduction reactor 200 consisting of a wider particle size distribution and a one-stage or two-stage or more reactor for fluid reduction of the secondary raw material and the secondary raw material, storing the reduced iron containing secondary raw materials reduced and discharged from the fluidized bed reduction reactor Agglomerator hopper 300, a compactor 310 for producing briquettes from the reduced ring iron supplied from the charge hopper 300, a separator 320 for separating the multi-arranged briquettes compacted in the agglomerator into individual briquettes 320 ), Melting the briquettes separated in the separator to produce molten iron and collect the exhaust gas from the melting furnace 500 and supply the exhaust gas to the reducing gas of the fluidized-bed reduction reactor and the dust is re-supplied to the melting furnace and the gas In the molten iron manufacturing process using a molten iron manufacturing apparatus comprising a melting furnace cyclone 510 for supplying the reducing gas of the fluidized bed reduction furnace, The reduced-reduction iron containing the sub-material discharged from the fluidized bed is characterized in that it is maintained for 30 to 60 minutes in the nitrogenizer atmosphere and the compactor charging hopper 300 having a temperature of 650 ~ 800 ℃.
Description
본 발명은 용융로에서 공급되는 고온의 환원가스로 석회석과 같은 부원료성분을 포함한 분철광석을 유동환원시키고, 환원된 분환원철을 고온에서 단광(브리켓)으로 제조하여 이를 용융로로 장입하여 용선을 생산하는 용융환원제철공정에서 첨가되는 부원료의 소성율을 제어할 수 있는 용선제조방법에 관한 것으로서, 보다 상세하게는 부원료를 함유한 분철광석을 단광제조공정에서 부원료의 소성율을 향상시켜 연료사용량을 줄일 수 있는 용선제조방법에 관한 것이다.The present invention is a high-temperature reducing gas supplied from the melting furnace to flow-reduced iron ore including secondary ingredients such as limestone, and to produce molten iron by charging the reduced iron reducing iron into briquettes (briquettes) at a high temperature to produce molten iron The present invention relates to a molten iron manufacturing method that can control the firing rate of the subsidiary materials added in the reducing steelmaking process. More specifically, it is possible to reduce the fuel consumption by improving the firing rate of the subsidiary materials in the briquette manufacturing process. It relates to a chartering method.
현재의 용선 생산공정은 고로공정이 주류를 이루고 있으며, 최근에 펠렛과 괴광석을 사용한 샤프트형 용융환원제철공정이 상업화되어 용선을 생산하고 있으나, 두 공정 모두 괴상화된 원료만을 사용해야하는 제약이 있다.In the current molten iron production process, the blast furnace process is the mainstream. Recently, shaft-type molten reduction steel making process using pellets and lump ore has been commercialized to produce molten iron, but both processes have limitations in using only the raw material. .
고로공정에서는 석탄을 가공한 코크스와 분상의 철광석과 부원료를 혼합하여 가공한 소결광을 사용하여 용선을 생산해야 함으로써 연/원료의 예비처리를 위한 설비투자비 증가와 예비처리과정에서 발생하는 공해문제가 심각하게 대두되고 있어 이에 따른 환경적인 규제가 강화되고 있는 실정이다. 한편, 샤프트형 용융환원 제철공정에서는 원료로 미분의 철광석을 펠렛으로 만들어 사용하거나 제한된 입도의 괴광석을 사용하여 용선을 생산하고 있다. 이와 같이 고로공정이나 샤프트형 용융환원 제철공정에서는 분상의 철광석을 직접 사용할 수 없고 예비처리 과정을 거쳐야 되므로 매장량이 풍부하고 가격도 저렴한 분철광석을 예비처리 과정을 거치지 않고 바로 사용하여 용선을 생산할 수 있는 유동층식의 용융환원제철공정이 기존의 고로공정을 대체할 차세대 제철공정으로 주목받고 있으며, 선진 철강 생산국을 중심으로 활발한 연구가 진행되고 있다.In the blast furnace process, molten iron must be produced by using coal processed coke, sintered ore mixed with powdered iron ore and by-products, thereby increasing the capital investment cost for pretreatment of raw materials and the pollution problem generated during the pretreatment process. As such, environmental regulations are being strengthened accordingly. On the other hand, in the shaft-type molten reduction steelmaking process is used to make fine iron ore as a raw material pellets or to produce molten iron using a lump ore of limited particle size. As such, in the blast furnace process or shaft-type molten-reduction steelmaking process, powdered iron ore cannot be used directly and needs to be pretreated, so that the ferrous iron can be produced by directly using ferrous ore, which is rich in reserves and low in cost, without undergoing pretreatment. The fluidized-bed molten reduced steelmaking process is drawing attention as the next-generation steelmaking process to replace the existing blast furnace process, and active research is being conducted mainly in advanced steel producing countries.
상술한 용융환원 제철공정은 일반적으로 예비환원공정과 최종환원공정으로 구분이 되는데, 구체적으로 예비환원단계에서는 환원로에서 원료광석을 고체상태로 예비환원시키고 최종환원단계에서는 이렇게 환원된 환원철을 용융로로 장입하여 용융시키면서 최종환원하여 용선을 생산하고 있다. 상기 예비환원공정은 일반적으로 원료광석의 입도에 따라 이동층식 및 유동층식으로 분류되는데 입도가 작고 입도분포가 넓은 분철광석의 경우는 원료광석을 환원로에서 환원가스로 유동시키면서 환원하는 유동층식이 통기성이나 가스이용율면에서 효율적인 것으로 알려져 있다.The above-mentioned molten reduction steelmaking process is generally classified into a preliminary reduction process and a final reduction process. Specifically, in the preliminary reduction step, the raw ore is reduced to solid state in a reduction furnace, and the reduced iron is reduced to a melting furnace in the final reduction step. It is charged with melting and finally reduced to produce molten iron. The preliminary reduction process is generally classified into a moving bed type and a fluidized bed type according to the particle size of the raw ore. In the case of ferrous ore having a small particle size and a wide particle size distribution, the fluidized bed type which reduces the raw material ore while flowing from the reduction furnace to the reducing gas is breathable. It is known to be efficient in terms of gas utilization.
이와 같이 분철광석을 원료로 사용하는 유동환원 공정에서 생산된 분환원철을 용융로에 장입하는 방법으로는 분환원철을 직접 장입하는 방법과 이를 단광으로 제조하여 장입하는 방법이 있다.As such, the method of charging the reducing iron produced in the flow reduction process using the iron-iron ore as a raw material into the melting furnace includes a method of directly charging the iron-reducing iron and a method of manufacturing and charging it with briquettes.
유동층식 예비환원로에서 생산된 분환원철을 단광으로 제조하고, 이를 용융로에 장입하여 용선을 생산하는 종래기술로서 대한민국 특허 제 117067호에 개시된 발명을 들 수 있으며 도 1에 그 장치의 개략도가 도시되어 있다. 도 1에 나타난 바와 같이, 상기 공보에 개시된 발명은 제1유동층환원로(31)와 제2유동층환원로(32)를 거쳐 환원된 분환원철 및 부원료를 괴성화기(36)에서 단광으로 제조하여 용융로(33)에 장입하여 용선을 생산하는 공정이다. 그러나 이러한 용선제조공정에서는 석회석(CaCO3)이나 백운석(CaCO3MgCO3)등이 부원료로서 분철광석과 함께 유동층환원로로 장입되며, 유동층환원로에서는 분철광석의 환원반응과 더불어 장입된 부원료성분의 소성반응이 동시에 일어난다.The invention disclosed in Korean Patent No. 117067 may be used as a conventional technique for manufacturing powdered reduced iron produced in a fluidized bed preliminary reactor and charging molten iron in a melting furnace to produce molten iron, and a schematic diagram of the apparatus is shown in FIG. 1. have. As shown in FIG. 1, the invention disclosed in the above publication is a molten furnace prepared by reducing iron and secondary raw materials reduced through the first fluidized-bed reduction reactor 31 and the second fluidized-bed reduction reactor 32 in the compactor 36. It is a process of charging to 33 and producing molten iron. However, in this molten iron manufacturing process, limestone (CaCO 3 ) or dolomite (CaCO 3 MgCO 3 ), etc., is charged to the fluidized-bed reduction reactor along with ferrous ore as a secondary raw material. Firing reactions occur simultaneously.
부원료로 첨가된 석회석이나 백운석의 소성반응은 아래 반응식으로 나타낼 수 있으며, 이러한 소성반응은 흡열반응으로써 추가적인 열원이 필요하다.The calcining reaction of limestone or dolomite added as an auxiliary material can be represented by the following reaction formula, which requires an additional heat source as an endothermic reaction.
(반응식 1)(Scheme 1)
CaCO3= CaO + CO2 CaCO 3 = CaO + CO 2
(반응식 2)(Scheme 2)
CaCO3MgCO3= CaO + MgO + 2(CO2)CaCO 3 MgCO 3 = CaO + MgO + 2 (CO 2 )
따라서 상기 용융로(500)로부터 유동층환원로(200)로 공급되는 환원가스 분위기에서는 부원료의 소성반응은 활발하지 못하는데, 예컨데, 석회석은 일반적으로 10-20%범위에 머무르며 백운석의 경우는 약 50%정도이며 나머지는 상기 용융로(500) 내에서 소성반응이 일어나게 된다. 즉 상기와 같은 용선제조공정에서는 부원료의 소성반응이 유동층환원로에서 일부만 일어나고 대부분이 용융로에서 일어나게 되므로, 용융로에서의 열원공급의 부담이 심화되는 문제가 있다.Therefore, in the reducing gas atmosphere supplied from the melting furnace 500 to the fluidized-bed reduction reactor 200, the calcining reaction of the subsidiary materials is not active. For example, limestone generally remains in the range of 10-20%, and in the case of dolomite, about 50%. And the remainder is a calcination reaction in the melting furnace (500). That is, in the molten iron manufacturing process as described above, since only a part of the calcination reaction occurs in the fluidized-bed reduction reactor and most of it occurs in the melting furnace, there is a problem that the burden of heat source supply in the melting furnace is intensified.
따라서 본 발명은 상술한 종래기술의 문제점을 해결하기 위하여 안출된 것으로서, 유동층환원로에서 환원 및 소성된후 배출된 부원료를 함유하고 있는 분환원철을 용융로로 장입하기 위해 단광으로 제조하는 공정에서 부원료성분을 소성한후, 용융로로 장입함으로써 전체적인 용선제조공정의 연료사용량을 줄일 수 있는 유동층식 환원로를 이용한 용선제조방법을 제공함에 그 목적이 있다.Therefore, the present invention has been made in order to solve the problems of the prior art described above, the secondary raw material component in the process of manufacturing briquettes to charge the molten iron containing the secondary raw material discharged after reduction and firing in the fluidized bed reduction furnace into the melting furnace It is an object of the present invention to provide a method for producing molten iron using a fluidized bed reduction furnace which can reduce the fuel consumption of the overall molten iron manufacturing process by firing the molten metal into a melting furnace.
도 1은 종래의 단광제조장치를 포함한 분철광석의 유동층식 환원로의 구성도1 is a block diagram of a fluidized bed reduction furnace of iron ore including a conventional briquette manufacturing apparatus
도 2는 본 발명에 따라 발생분진을 괴성화하여 원료로 이용하기 위한 유동층식 용융환원 제철공정의 구성도2 is a block diagram of a fluidized bed melt reduction steelmaking process for compacting the generated dust according to the present invention to use as a raw material
* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
100..... 원료 장입호퍼 101..... 원료 장입관100 ..... Raw Material Loading Hopper 101 ..... Raw Material Loading Pipe
200..... 유동층 환원로 201..... 환원철 배출관200 ..... Fluidized-bed reduction furnace 201 ..... Reduced iron discharge line
203..... 제1스크러버 205..... 제1공정수 배출관203 ..... 1st scrubber 205 ..... 1st process water discharge pipe
300..... 괴성화기 장입호퍼 310..... 괴성화기300 ..... compactor hopper 310 ..... compactor
320..... 분리기 321..... 단광 장입관320 ..... Separator 321 ..... Briquette Filling Tube
322..... 분진 배출관 323..... 제2스크러버322 ..... dust exhaust pipe 323 ..... 2nd scrubber
325..... 제2공정수 배출관 400..... 수처리장치325 ..... 2nd process water discharge pipe 400 ..... water treatment device
401..... 슬러지 배출관 402..... 제3공정수 배출관401 ..... Sludge discharge pipe 402 ..... 3rd process water discharge pipe
410..... 슬러지 처리장치 411..... 슬러지 공급관410 ..... Sludge Treatment System 411 ..... Sludge Supply Line
500..... 용융로 510..... 용융로 사이클론500 ..... Melting Furnace 510 ..... Melting Furnace Cyclone
511..... 환원가스 공급관511 ..... reducing gas supply pipe
상기 목적을 달성하기 위한 본 발명,The present invention for achieving the above object,
입도분포가 넓은 분철광석과 부원료를 유동환원시키는 1단 또는 2단 이상의 반응기로 구성된 유동층환원로(200), 상기 유동층환원로에서 환원되어 배출되는 부원료를 함유하는 분환원철을 저장하는 괴성화기 장입호퍼(300), 상기 장입호퍼 (300)으로부터 공급받은 분환원철로부터 단광으로 제조하는 괴성화기(310), 상기 괴성화기에서 괴성화된 다열의 단광을 개개의 단광으로 분리하는 분리기(320), 상기 분리기에서 분리된 단광을 용융시켜 용선을 생산하고 그 배가스를 상기 유동층환원로의 환원가스로 공급하는 용융로(500) 및 상기 용융로에서 발생하는 배가스를 포집하여 더스트는 용융로에 재공급하고 가스는 유동층환원로의 환원가스로 공급하는 용융로 사이클론(510)를 포함하여 구성되는 용선제조장치를 이용하는 용선제조공정에 있어서,Fluidized bed reduction furnace 200 consisting of a wider particle size distribution of iron ore and one or more reactors for fluid reduction of secondary raw materials, and a compactor charging hopper for storing a reduced iron containing secondary raw materials reduced and discharged from the fluidized bed reducing reactor (300), a compactor 310 for producing briquettes from the reduced ring iron supplied from the charging hopper (300), a separator 320 for separating the multi-briquettes compacted in the compactor into individual briquettes, the separator Melting the briquette separated from to produce molten iron and collect the flue gas 500 and supply the exhaust gas to the reducing gas of the fluidized-bed reduction furnace and the exhaust gas generated in the melting furnace to collect dust and re-supply to the melting furnace and the gas is fluidized bed reduction furnace In the molten iron manufacturing process using a molten iron manufacturing apparatus comprising a melting furnace cyclone (510) for supplying a reducing gas of
상기 유동층로부터 배출된 부원료를 함유한 분환원철을 질소가스 분위기와 650 ~ 800℃의 온도범위를 갖는 괴성화기 장입호퍼(300)내에서 30~60분 체류시킴을 특징으로 하는 용선제조방법에 관한 것이다.It relates to a molten iron production method characterized in that for 30 minutes to 60 minutes in the compacted reactor loading hopper 300 having a nitrogen gas atmosphere and a temperature range of 650 ~ 800 ℃ containing the secondary raw material discharged from the fluidized bed. .
이하, 첨부도면을 참조하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명의 용선제조공정에 이용될 수 있는 단광제조장치를 구비하고 있는 용선제조장치의 구성된다.Figure 2 is a configuration of a molten iron manufacturing apparatus having a briquette manufacturing apparatus that can be used in the molten iron manufacturing process of the present invention.
도 2에 나타난 바와 같이, 본 발명의 용선제조장치는, 분철광석과 부원료를 유동층환원로에 장입하기 위한 원료 장입호퍼(100), 상기 원료 장입호퍼로부터 원료 장입관(101)을 통해 공급된 원료를 유동환원시키는 2단 또는 3단의 반응기로 구성된 유동층환원로(200), 상기 유동층환원로에서 환원되어 배출되는 부원료를 함유한 분환원철을 저장하는 괴성화기 장입호퍼(300), 상기 괴성화기 장입호퍼에서 공급된 분환원철 및 부원료를 단광으로 제조하는 괴성화기(310), 상기 괴성화기에서 배출되는 다열의 단광을 개개의 단광으로 분리하기 위한 분리장치(320), 상기 분리장치에서 분리된 단광을 용융로에 장입하기 위한 단광장입관(321), 상기 단광장입관에서 공급되는 단광을 용융시켜 용선을 생산하는 용융로(500) 및 상기 용융로에서 발생하는 더스트를 포함한 환원가스 중 더스트와 가스를 분리하기 위한 용융로 사이클론(510)을 포함하여 구성되어 있다.As shown in Figure 2, the molten iron manufacturing apparatus of the present invention, the raw material charging hopper 100 for charging the iron ore and the subsidiary materials into the fluidized-bed reduction reactor, the raw material supplied through the raw material charging pipe 101 from the raw material charging hopper Fluidized bed reduction reactor 200 consisting of a two-stage or three-stage reactor to reduce the flow, a compactor charging hopper 300 for storing the reduced iron containing secondary raw materials reduced and discharged from the fluidized-bed reduction reactor, charged with the compactor The agglomerator 310 for manufacturing the reduced or reduced iron supplied from the hopper as a briquette, a separator 320 for separating the multi-stage briquettes discharged from the agglomerator into individual briquettes, a briquette separated from the separator It includes a briquette charging pipe 321 for charging into a melting furnace, a melting furnace 500 for melting molten briquettes supplied from the briquette charging pipe to produce molten iron, and dust generated in the melting furnace. Melting furnace cyclone 510 for separating the dust and gas in the reducing gas is configured to include.
또한 본 발명의 용선제조장치에서는 상기 용융로 사이클론(510)과 유동층환원로(200)는 환원가스공급관(511)을 통해 환원가스 소통관계로 연결되어 있으며, 상기 용융로(500)와 용융로 사이클론(510)은 더스트순환관(502)을 통해 더스트 소통관계로 연결되어 있다.In addition, in the molten iron manufacturing apparatus of the present invention, the melting furnace cyclone 510 and the fluidized-bed reduction reactor 200 are connected in a reducing gas communication relationship through a reducing gas supply pipe 511, and the melting furnace 500 and the melting furnace cyclone 510. Is connected to the dust communication through the dust circulation pipe (502).
한편, 본 발명에서는 도 2와 같이, 상기 유동층 환원로(200), 상기 괴성화기(310) 및 분리장치(320)에서 발생된 분진을 슬러지로 분리, 회수할 수 있는 설비를 포함할 수도 있다.On the other hand, in the present invention, as shown in Figure 2, it may include a facility for separating and recovering the dust generated in the fluidized bed reduction furnace 200, the compactor 310 and the separation device 320 with sludge.
구체적으로, 본 발명의 용선제조장치는, 상기 유동층 환원로(200), 괴성화장치(310) 및 분리장치(320)에서 발생되는 분진을 각각의 분진 배출관(202, 322)을 통하여 공급받아 공정수에 의해 가스와 분진을 분리시키고 분리된 가스는 가스배출관(204,324)를 통하여 배출시키는 제1스크러버(203)과 제2스크러버(323), 상기 제1 및 제2스크러버(203,323)에서 제1 및 제2 공정수배출관 (204,324)를 통하여 공정수와 함께 배출된 분진을 슬러지로 농축시키고 공정수는 제3공정수 배출관(402)으로 배출시키는 수처리장치(400) 및 상기 수처리장치(400)에서 배출된 슬러지를 슬러지 배출관(401)을 통하여 공급받아, 슬러지를 탈수 및 건조시키고 필요한 경우 건조된 슬러지를 분쇄한후 슬러지 공급관(411)을 통하여 상기 괴성화기(310)에 공급하는 슬러지 처리장치(410)를 포함하여 구성될 수도 있다.Specifically, in the molten iron manufacturing apparatus of the present invention, the dust generated in the fluidized bed reduction furnace 200, the compacting device 310 and the separation device 320 is supplied through the respective dust discharge pipe (202, 322) process First and second in the first and second scrubbers 323 and the first and second scrubbers 203 and 323 which separate gas and dust by water and discharge the separated gas through the gas discharge pipes 204 and 324. Concentrates the dust discharged with the process water through the second process water discharge pipe (204,324) to the sludge and discharged from the water treatment device 400 and the water treatment device 400 to discharge the process water to the third process water discharge pipe (402) The sludge treatment apparatus 410 which receives the sludge through the sludge discharge pipe 401, dehydrates and dries the sludge if necessary, pulverizes the dried sludge and supplies the sludge to the compactor 310 through the sludge supply pipe 411. Can be configured including There is also.
이하, 상기 용선제조장치를 이용한 본 발명의 용선제조공정을 설명한다.Hereinafter, the molten iron manufacturing process of the present invention using the molten iron manufacturing apparatus will be described.
먼저, 원료장입호퍼(100)로부터 원료 장입관(101)을 통하여 유동층환원로 (200)로 장입된 분철광석과 부원료는 환원가스공급관(511)으로 유입되는 용융로 (500)의 배가스에 의해 기포유동층을 형성하면서 예비환원 및 소성된다. 상기 유동층환원로(200)는 필요에 따라 2개 또는 3개의 유동층로를 연속으로 연결하여 2단 또는 3단의 유동층환원로 시스템으로 구성할 수 있다.First, the powdered iron ore and the subsidiary materials charged from the raw material charging hopper 100 to the fluidized-bed reduction reactor 200 through the raw material charging pipe 101 are bubbled by the exhaust gas of the melting furnace 500 introduced into the reducing gas supply pipe 511. It is pre-reduced and calcined while forming. The fluidized-bed reduction reactor 200 may be configured as a two-stage or three-stage fluidized-bed reduction reactor system by continuously connecting two or three fluidized bed furnaces as necessary.
상기 유동층환원로에서 예비환원 및 소성된 부원료를 포함한 분환원철은 환원철배출관(201)을 통해 괴성화기 장입호퍼(300)로 배출되고 괴성화기(310)로 공급되어 단광으로 만들어진다.The reduced-reduced iron including the pre-reduced and calcined secondary raw materials in the fluidized-bed reduction reactor is discharged to the compactor charging hopper 300 through the reduced iron discharge pipe 201 and supplied to the compactor 310 to be made into briquettes.
본 발명에서는 이때, 유동층환원로(200)에서 배출된 부원료를 함유한 분환원철이 괴성화기(310)로 공급되기전에 잠시 머무르는 괴성화 장입호퍼(300)에서의 온도범위와 분위기가스를 적정하게 제어하여 분환원철중에 함유된 부원료성분의 소성반응을 진행시킴에 그 특징이 있다. 상술한 바와 같이, 종래에는 부원료로 첨가되는 석회석이나 백운석중 일부만 유동층환원로(200)에서 소성반응되었으며, 잔여분은 결국 용융로(500)에서 소성반응되었다. 그러나 이러한 소성반응은 흡열반응이므로 추가적인 열원이 필요하므로, 만일 용융로(500)내에서 그 대부분이 소성반응되면 용융로에서의 열원공급의 부담이 커질 수 밖에 없는 문제가 있었다.In the present invention, at this time, appropriately control the temperature range and the atmosphere gas in the compacted charging hopper 300 that stays for a while before the reduced iron containing the secondary raw material discharged from the fluidized bed reduction reactor 200 is supplied to the compactor 310 It is characterized by proceeding the calcination reaction of the secondary raw material components contained in the branch reducing iron. As described above, in the prior art, only a part of limestone or dolomite added as a subsidiary material was calcined in the fluidized-bed reduction reactor 200, and the remainder was finally calcined in the melting furnace 500. However, since the calcining reaction is an endothermic reaction, an additional heat source is required, and if the majority of the calcining reaction is performed in the melting furnace 500, the burden of supplying the heat source in the melting furnace has to be increased.
따라서 본 발명에서는 유동층환원로에서 배출된 분환원철이 용융로로 장입되기 전단계인 단광제조공정에서 부원료성분의 소성반응을 활성화시키고, 이어, 이를 용융로에 장입시켜 상술한 문제점을 해결함에 그 특징이 있는 것이다.Therefore, in the present invention, it is characterized by activating the sintering reaction of subsidiary ingredients in the briquetting manufacturing process, before the reduced-reduced iron discharged from the fluidized-bed reduction furnace is charged into the melting furnace, and then charging it into the melting furnace to solve the above problems. .
구체적으로, 본 발명에서는 유동층로로 부터 배출된 부원료를 함유하고 있는 분환원철을 저장하는 상기 괴성화기 장입호퍼(300)의 분위기를 질소가스 분위기로 제어하며, 아울러 그 온도를 650-800℃로 제한한다. 만일 상기 장입호퍼(300)내의 온도가 650℃미만이면 부원료성분의 소성반응이 거의 일어나지 않으며, 800℃를 초과하면 분환원철 입자들이 서로 달라붙어 국부적인 브릿지 현상이 일어나 분환원철을 괴성화기(310)로 원활하게 장입할 수 없기 때문이다.Specifically, the present invention controls the atmosphere of the compactor charging hopper 300 for storing the reduced or reduced iron containing secondary raw material discharged from the fluidized bed to a nitrogen gas atmosphere, and also limit the temperature to 650-800 ℃ do. If the temperature in the charging hopper 300 is less than 650 ℃ almost no plastic reaction of the raw material component occurs, if it exceeds 800 ℃ the reduced iron particles stick to each other local bridge phenomenon occurs to compact the reduced iron (310) This is because it can not be charged smoothly.
또한 본 발명에서는 상기 유동층로(200)으로 부터 배출된 부원료 함유 분환원철을 상기 장입호퍼(300)내에서 30~60분 동안 체류시킴이 바람직하다. 만일 그 체류시간이 너무 짧으면 부원료성분의 소성반응에 필요한 시간이 부족할 수 있으며, 너무 길어지면 상기에서 언급한 브릿지 현상이 일어날 수 있기 때문이다.In addition, in the present invention, it is preferable that the secondary raw material-containing reduced iron discharged from the fluidized bed furnace 200 is maintained for 30 to 60 minutes in the charging hopper 300. If the residence time is too short, the time required for the firing reaction of the sub-component may be insufficient, and if it is too long, the above-mentioned bridge phenomenon may occur.
한편, 상기 소성반응을 거친 분환원철은 괴성화기(210)으로 공급되어 단광으로 제조되는데, 이때, 상기 슬러지 처리장치(410)에서 공급된 슬러지를 단광의 제조에 함께 이용할 수 있다. 그런데 상기 슬러지에 포함된 다량의 탄소성분은 분환원철을 단광화하는데 악영향을 미칠 수 있는 것으로 알려져 있기 때문에 첨가량을 조절할 필요가 있다.On the other hand, the reduced reducing iron is subjected to the calcining reaction is supplied to the compactor 210 is produced as briquette, in this case, the sludge supplied from the sludge treatment apparatus 410 can be used together in the production of briquettes. However, since the large amount of carbon contained in the sludge is known to adversely affect the briquetting of the reduced iron, it is necessary to adjust the amount of addition.
따라서 본 발명에서는 상기 괴성화기로 공급되는 재활용 슬러지의 중량을 상기 장입호퍼(300)으로 부터 공급되는 분환원철 중량 대비 5%를 넘지 않도록 제어함이 바람직하다. 또한 건조된 슬러지는 고형화되어 크기가 일정하지 않기 때문에 최대 크기를 조절할 필요가 있는데, 이때에는 원료인 분철광석의 최대 크기와 같게 슬러지 처리장치(410)에서 분쇄함이 바람직하다.Therefore, in the present invention, it is preferable to control the weight of the recycle sludge supplied to the compactor so as not to exceed 5% compared to the weight of the reduced iron supplied from the charging hopper (300). In addition, it is necessary to adjust the maximum size because the dried sludge is solid and the size is not constant. At this time, it is preferable to grind in the sludge treatment apparatus 410 in the same manner as the maximum size of the raw iron ore.
그리고 상기 괴성화기(310)에서 제조된 단광은 이후, 그 하부의 분리장치 (320)를 통하여 개개의 단광으로 분리하고, 분리된 개개의 단광은 단광장입관(321)을 통하여 용융로(500)로 장입함으로써 용융로(500)에서의 열적부담을 효과적으로 해소할 수 있어, 전체적인 용선제조공정에서의 연료사용량을 저감시킬 수 있는 것이다.Then, the briquettes manufactured by the compactor 310 are separated into individual briquettes through a separator 320 below, and the separated briquettes are separated into the melting furnace 500 through the briquette charging pipe 321. By charging, the thermal burden in the melting furnace 500 can be effectively eliminated, and the fuel consumption in the whole molten iron manufacturing process can be reduced.
이하, 실시예를 통하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail through examples.
(실시예)(Example)
유동층로(200)에서 배출된 부원료로서 석회석을 함유하는 분환원철을 마련하였으며, 이때, 유동층로에서의 석회석의 소성율은 약 20%정도 였다. 이렇게 마련된 분환원철을 이용하여 괴성화기(310)에서 단광을 제조하기 전에, 질소가스 분위기와 610~800℃의 온도로 제어되고 있는 괴성화기 장입호퍼(300)에 장입하여 60분간 유지시킨후, 그 부원료분의 소성반응율을 측정하여 하기 표 1에 정리하였다.As a feedstock discharged from the fluidized bed furnace 200, a reduced-reduced iron containing limestone was prepared. At this time, the calcined rate of limestone in the fluidized bed furnace was about 20%. Before manufacturing briquettes in the compactor 310 using the reduced-reduction iron thus prepared, charged into the compactor charging hopper 300 which is controlled at a nitrogen gas atmosphere and at a temperature of 610 to 800 ° C, and maintained for 60 minutes. The calcining reaction rate of the minor raw material was measured and summarized in Table 1 below.
상기 표 1에 나타난 바와같이, 610℃ 에서는 추가적인 소성반응이 거의 일어나지 않음을 알 수 있으며, 700~800℃에서는 온도가 높을수록 소성율이 증가하는 것을 알 수 있다.As shown in Table 1, it can be seen that the additional calcining reaction hardly occurs at 610 ° C, and at 700 to 800 ° C, the firing rate increases as the temperature increases.
특히, 본 발명자의 실험에 의하면 상기 소성율이 70% 정도인 경우, 용융로에서의 연료사용량을 약 5% 내외로 줄일 수 있는 것으로 나타났다.In particular, the experiments of the present inventors showed that when the firing rate is about 70%, the fuel consumption in the melting furnace can be reduced to about 5%.
상술한 바와 같이, 발명의 용선제조방법에서는 부원료성분이 함유된 분환원철을 용융로로 장입하기 위해 단광으로 제조하는 공정에서 부원료성분의 소성율을향상시켜 용선제조공정의 연료 사용량을 줄이는데 효과가 있다.As described above, the molten iron manufacturing method of the present invention is effective in reducing the amount of fuel used in the molten iron manufacturing process by improving the firing rate of the secondary raw material component in the manufacturing process of briquettes to charge the reduced ring iron containing the secondary raw material into the melting furnace.
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| KR101539748B1 (en) * | 2013-12-24 | 2015-07-27 | 주식회사 포스코 | Apparatus for manufacturing molten iron |
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