KR19980052528A - Melt Reduction Steelmaking - Google Patents
Melt Reduction Steelmaking Download PDFInfo
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- KR19980052528A KR19980052528A KR1019960071535A KR19960071535A KR19980052528A KR 19980052528 A KR19980052528 A KR 19980052528A KR 1019960071535 A KR1019960071535 A KR 1019960071535A KR 19960071535 A KR19960071535 A KR 19960071535A KR 19980052528 A KR19980052528 A KR 19980052528A
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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
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
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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
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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
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
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Abstract
본 발명은 용융환원로 제철법에 관한 것이며, 그 목적은 석탄을 예열건류하여 용융환원로를 열적으로 안정화하고, 아울러 분탄과 예비환원광석을 괴성화 하여 중력장입함으로써 공정이 합리적인 용융환원 제철법을 제공함에 있다.The present invention relates to a molten reduction furnace steelmaking method, and its purpose is to preheat and dry coal to thermally stabilize the molten reduction furnace, and also to harden the coal and prereduced ores by gravity loading to make the rational melt reduction steelmaking method. In providing.
본 발명은 용융환원로의 배가스를 이용하여 석탄을 예열한 후, 예열된 석탄을 분급기에서 괴탄과 분탄으로 분급하여 상기 괴탄을 용융환원로에 장입하고, 상기 분탄은 분탄저장조에 저장하며, 예비환원로에서 환원된 예비환원분광을 괴성화 장치에 장입하고, 상기 예비환원로 배가스를 이용하여 상기 분탄저장조에 저장되어 있는 분탄과 석탄 더스트를 괴성화 장치로 이송시켜 예비환원분광을 괴성화 시킨 후, 괴성화된 예비환원분광을 용융환원로에 중력 장입하여 선철을 제조하는 용융환원 제철법에 관한 것을 그 기술적 요지로 한다.According to the present invention, after preheating coal by using exhaust gas of a molten reduction furnace, the preheated coal is classified into coal and coal in a classifier, and the coal is charged into a molten reactor, and the coal is stored in a coal storage tank. After charging the pre-reduced spectroscopy reduced in the reduction furnace to the compacting device, by using the pre-reduction flue gas to transfer the powdered coal and coal dust stored in the coal coal storage tank to the compacting device to compact the pre-reduced spectroscopy As a technical gist of the method, the gravity reduction charge of the compacted pre-reduced spectroscopy into a melt reduction reactor produces pig iron.
Description
본 발명은 용융환원 제철법에 관한 것으로써, 보다 상세하게는 석탄을 예열 건류함으로써 용융환원로를 열적으로 안정화하고, 아울러 분탄과 예비환원광석을 괴성화한 후 중력장입하여 용선을 제조하는 용융환원 제철법에 관한 것이다.The present invention relates to a molten reduction steelmaking method, and more particularly, molten reduction of thermally stabilizing a molten reduction furnace by preheating and distilling coal, and further by melting the powdered coal and the preliminary reduction ore and gravity loading to produce molten iron. It is about the steelmaking method.
통상적으로, 철광석을 환원하여 용철을 생산하는 방법으로는 고로를 사용하는 방법과 샤프트로를 사용하여 환원한 철광성을 전기로에서 용해하는 방법 등이 종래부터 채용되고 있다.Usually, as a method of producing iron by reducing iron ore, a method of using a blast furnace and a method of dissolving iron ore reduced in an electric furnace using a shaft furnace have been conventionally employed.
상기 고로공정에 의한 용철제조방법에 있어서, 열원 및 환원제로서 다량의 코크스를 사용하고, 철광석은 통기성과 환원성을 향상시키기 위해 소결광의 형태로 고로에 장입되고 있다. 이 때문에 현재의 고로법은 강점결탄을 건류하기 위한 코크스로 설비 및 소결과 제조설비를 필요로 한다.In the molten iron manufacturing method according to the blast furnace process, a large amount of coke is used as a heat source and a reducing agent, and iron ore is charged into the blast furnace in the form of sintered ore to improve air permeability and reducing properties. For this reason, the current blast furnace method requires a coke oven facility and a sintering and manufacturing facility for carbonizing strong coal briquettes.
따라서, 고로법은 막대한 설비비와 함께 에너지 다소비 공정이며 코크스 제조원료인 강점결탄은 세계적으로 부존량이 적고 지역적으로 편재되어 있으므로, 철강수요의 증대에 따라 수급상의 문제가 심각하다.Therefore, the blast furnace method is an energy-consuming process with enormous equipment costs, and coking coking raw material coking coal has a small amount of coexistence in the world and is ubiquitous locally.
한편, 샤프트로에 의한 철광석의 환원법은 철광석을 펠레트화하는 전처리단계가 필요하고, 또한, 환원제와 열원으로서 천연가스를 사용하는 관계로 천연가스의 공급이 용이한 지역에서만 상업화 운전이 가능한 결점 등이 있어 코크스를 사용하지 않고 일반탄을 사용하여 분상의 철광석으로부터 용철을 제조하는 용융환원법이 새로운 제철법으로 주목받고 있는 실정이다.On the other hand, the reduction of iron ore by the shaft furnace requires a pretreatment step of pelletizing iron ore, and also has the drawback that commercialization operation is possible only in an area where natural gas can be easily supplied due to the use of natural gas as a reducing agent and a heat source. Therefore, the melting reduction method for producing molten iron from powdery iron ore using coking without using coke has been attracting attention as a new steelmaking method.
이와 같은 용융환원법에 있어서는 보통 환원로에서 환원된 철광석을 용융로에 장입하여 용철로 환원하는 방식이 채용되고 있다. 상기 환원로에서는 철광석의 용융전에 철광석을 고체상태에서 환원하는 것으로, 장입한 철광석을 용융로에서 발생한 고온의 환원성가스와 접촉시켜 환원해야 한다. 이러한 환원공정은 철광석과 환원성가스의 접촉상태에 따라 이동층 또는 유동층식으로 분류되는데, 입경분포가 넓은 분립상의 철광석을 환원로에 장입하고 하부의 분산판을 통해 환원가스를 보내 철광석을 유동시키면서 환원하는 유동층식이 분철광석을 환원하는 방법으로써 가장 적절한 프로세스로 평가되고 있다.In such a melt reduction method, a method of charging iron ore reduced in a reducing furnace into a molten furnace and reducing the molten iron is generally employed. In the reduction furnace, the iron ore is reduced in a solid state before melting the iron ore, and the charged iron ore should be reduced by contact with a high temperature reducing gas generated in the melting furnace. This reduction process is classified into moving bed or fluidized bed type according to the contact state of iron ore and reducing gas. The granular iron ore having a large particle size distribution is charged into the reduction furnace, and the reducing gas is sent while reducing iron ore flows through the lower dispersion plate. Fluidized bed is evaluated as the most appropriate process as a method for reducing the iron ore.
한편, 제1도에 나타낸 바와 같이 유동층식 환원로에서 환원 배출된 환원분광을 용융환원로에 중력 투하하는 경우, 용융환원로내에서 발생 배출되는 환원성 가스의 고속의 상승 흐름과 함께 중/미립 환원철이 비산하게 된다. 이와 같은 환원철의 비산으로 용융환원로의 배가스내 중/미립 환원철의 함유농도를 높여 용융로 배가스의 가스정제 설비인 사이클론의 부하를 증대시켜 포집율을 저하시키며, 또한 환원로내 가스분산판에 부착물을 형성하여 결국 분산판의 구멍을 막게 되며 비산손실의 증대로 용융환원로에서 환원분광의 용융효율의 저하를 초래하게 된다.On the other hand, as shown in FIG. 1, when gravity-reducing reduction spectroscopy reduced and discharged from a fluidized-bed reduction reactor is carried out to the melt reduction reactor, the medium / fine reduced iron with a high-speed ascending flow of reducing gas generated in the melt reduction reactor This is scattered. The scattering of the reduced iron increases the concentration of heavy and fine reduced iron in the flue-gas of the melting and reducing furnace, thereby increasing the load of the cyclone, a gas purification facility for the flue-gas, and lowering the collection rate. As a result, the holes of the dispersion plate are blocked, and the scattering loss is increased, resulting in a decrease in the melting efficiency of the reduced spectroscopy in the melt reduction reactor.
이와 같은 문제점을 해결하기 위하여, 미국특허 제4,978,387호와 대한민국 특허출원 제87-12076호 및 일본특개 소 제62-224620호에서는 제2도와 같이 환원분광을 용융환원로에 투입하는 방법으로 운송가스와 버너를 이용하고 있다. 그러나, 이 방법을 사용함에 있어서는 미분환원철을 유동층배출구에서 버너까지 운송을 위해 막대한 양의 가스가 필요할 뿐 아니라, 환원분광에 의해 버너주위가 심하게 마모되어 장기간 사용할 때 수시로 버너를 교체해야 하는 문제가 있으며, 또한 상온의 운송가스의 승온열이 추가로 소요되므로 전체적으로 에너지를 과다 소비하는 요인이 문제점으로 지적되고 있다.In order to solve this problem, US Pat. No. 4,978,387, Korean Patent Application No. 87-12076, and Japanese Patent Laid-Open No. 62-224620, as shown in FIG. I am using a burner. However, in this method, not only a huge amount of gas is required to transport finely-reduced iron from the fluidized bed outlet to the burner, but also the burner is severely worn down by reduction spectroscopy, and the burner needs to be replaced frequently during long-term use. In addition, since the heating heat of the transport gas at room temperature is additionally consumed, the factor of excessive consumption of energy as a whole is pointed out as a problem.
또한, 일본특개 명 제1-116035호, 제1-119631호, 제1-188635호, 제1-247513호, 제1-252714호에는 분철광석과 석탄을 혼합하고, 이 혼합물을 열간 성형 또는 가압성형을 통해 제조한 괴성화 브리케트(Briquette)를 용융환원로의 투입원료로서 사용하는 방법이 제안되어 있다. 그러나, 이 방법들에서는 환원철과 석탄의 혼합물을 괴성화하기 위한 성형기가 예비환원로와 용융환원로와 용융환원로 사이에 별도로 설치되어야 하는 결점이 있다.In addition, Japanese Laid-Open Nos. 1-116035, 1-119631, 1-188635, 1-247513, and 1-252714 are mixed with iron ore and coal, and the mixture is hot formed or pressurized. There has been proposed a method of using agglomerated briquettes produced through molding as feedstock to a melt reduction reactor. However, in these methods, there is a drawback that a molding machine for compacting a mixture of reduced iron and coal must be separately installed between the preliminary reduction furnace and the molten reduction reactor.
이에, 본 발명은 상기와 같은 종래의 문제점을 해결하기 위하여 안출된 것으로서, 용융환원로 배가스를 이용하여 석탄을 예열 건열함으로써 노열제어가 용이하고, 열원을 절약할 수 있고 또한, 분탄과 예비환원분광을 혼합 응집하여 괴성화함으로써 괴성화된 분광을 용이하게 용융환원로에 장입할 수 있는 용융환원 제철법을 제공하는데, 그 목적이 있다.Accordingly, the present invention has been made in order to solve the above-mentioned conventional problems, it is easy to control the furnace heat by preheating and drying the coal by using the exhaust gas of the molten reduction furnace, it is possible to save the heat source, and also powdered coal and pre-reduced spectroscopy It is an object of the present invention to provide a molten reduction steelmaking method in which agglomerated spectroscopy can be easily loaded into a molten reduction reactor by mixing and agglomerating the aggregates.
제1도는 종래의 방법에 따라 예비환원 분광석을 취입하여 용융선철을 제조하는 공정을 나타내는 공정도1 is a process diagram showing a process for producing molten pig iron by blowing pre-reduced spectroscopy according to a conventional method
제2도는 종래의 방법에 따라 예비환원 분광석을 브리케팅한 후 용융환원로에 장입하여 용융선철을 제조하는 공정을 나타내는 공정도2 is a process diagram showing a process of manufacturing molten pig iron by briquetting pre-reduced spectroscopy according to a conventional method, and then charging the reduced-reduction spectroscopy into a melt reduction reactor.
제3도는 본 발명에 따라 예비환원 분광석을 괴성화한 후 용융환원로에 장입하여 용융선철을 제조하는 공정을 나타내는 공정도Figure 3 is a process diagram showing a process for producing molten pig iron by compacting the pre-reduced spectroscopy in accordance with the present invention and then charged into a melt reduction reactor
제4도는 예비환원율이 다른 환원철에 대하여 일반탄 배합비 변화에 따른 압축강도 변화를 나타내는 그래프4 is a graph showing the change in compressive strength according to the change in the mixing ratio of ordinary coals for reduced iron having different preliminary reduction rates.
*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
1:용융환원로2:예비환원로1: melt reduction furnace 2: preliminary reduction furnace
3:괴성화장치4:분탄저장조3: compacting device 4: coal dust storage tank
5:석탄예열로6:분급기5: coal preheating furnace 6: classifier
7:고온사이클론7: high temperature cyclone
본 발명은 용융환원로 배가스를 이용하여 철광석을 예비환원로에서 예비환원한 후 예비환원된 환원철과 석탄을 용융환원로에 장입하여 용선을 제조하는 방법에 있어서,The present invention is a method for manufacturing molten iron by charging iron ore in a preliminary reduction reactor using a molten reduction reactor exhaust gas, and then charging the reduced iron and coal pre-reduced in the molten reduction reactor,
상기 용융환원로의 배가스를 이용하여 석탄을 예열하는 단계; 상기 예열된 석탄을 분급기에서 괴탄과 분탄으로 분급하여 상기 괴탄을 용융환원로에 장입하고, 상기 분탄은 분탄저장조에 저장하는 단계; 상기 석탄예열로에서 발생하는 석탄더스트 함유 배가스를 고온사이클론에서 집진하여 석탄더스트는 분탄저장조에 이송하고, 가스는 용융환원 배가스와 혼합하여 예비환원로로 공급하는 단계; 와 상기 예비환원로에서 환원된 예비환원분광을 괴성화장치에 장입하고, 상기 예비환원로 배가스를 이용하여 상기 분진저장조에 저장되어 있는 분탄과 석탄더스트를 괴성화 장치로 이송시켜 예비환원분광을 괴성화시키는 단계; 및 상기와 같이 괴성화된 예비환원 분광을 용융환원로에 중력 장입하는 단계; 를 포함하여 구성되는 용융환원제철법에 관한 것이다.Preheating coal using exhaust gas of the melt reduction reactor; Classifying the preheated coal into coal and powdered coal in a classifier to charge the coal coal into a molten reduction reactor and storing the coal in a coal storage tank; Collecting coal dust containing flue gas generated in the coal preheater in a high temperature cyclone to transfer coal dust to a coal dust storage tank, and supplying the gas to the preliminary reduction furnace by mixing the melt reduction flue gas; And preliminary reduction spectroscopy reduced in the preliminary reduction furnace is charged to the compaction apparatus, and the coal dust and coal dust stored in the dust storage tank are transferred to the compaction apparatus using the preliminary reduction reactor exhaust gas to compact the preliminary reduction spectroscopy. Oxidizing; And gravity loading the compacted pre-reduction spectroscopy into the melt reduction reactor as described above. It relates to a molten iron reduction method comprising a.
이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.
제3도는 본 발명의 용융환원제철법의 바람직한 공정의 일례가 나타나 있다. 제3도에 나타낸 바와 같이, 본 발명은 분광석을 예비환원로에서 예비환원한 다음, 용융환원로에서 용융환원하여 선철을 제조하는 방법에 적용되는 것으로서, 예비환원 공정에서 예비환원된 환원분광을 괴성화하여 용융환원로에 중력장입할 수 있는 방법에 관한 것이다.3 shows an example of a preferred process of the melt-reducing steelmaking method of the present invention. As shown in FIG. 3, the present invention is applied to a method of preparing pig iron by preliminarily reducing spectroscopy in a preliminary reduction reactor and then melting reduction in a melt reduction reactor. It relates to a method that can be gravity-charged into the melt reduction reactor by agglomeration.
상기 예비환원분광의 괴성화시에는 괴성화장치를 2조로 구성하여 환원분광의 장입공정과 괴성화하여 용융환원로내로 중력 장입하는 공정을 교대로 수행하는 것이 바람직하다.When the preliminary reduction spectroscopy is agglomerated, it is preferable to alternately perform a process of charging the reduction spectroscopy by two sets of agglomeration apparatuses and a process of agglomeration by gravity into the melt reduction reactor.
제3도에 나타난 바와 같이, 석탄예열로(5)로 연속적으로 장입된 석탄은 용융환원로(1)에서 올라오는 약 1100℃의 배가스(25)와 접촉하면서 일부의 휘발성분은 휘발되고 또 일부의 탄소는 환원성가스와 접촉하면서 C+CO2=2CO 및 C+H2C=CO+H2의 반응에 의하여 환원포텐셜은 더욱 높아지게 된다.As shown in FIG. 3, some of the volatiles are volatilized and some are volatilized while the coal continuously charged into the coal preheater 5 is in contact with the flue gas 25 at about 1100 ° C. rising from the melt reduction reactor 1. While the carbon of is in contact with the reducing gas, the reduction potential is further increased by the reaction of C + CO 2 = 2CO and C + H 2 C = CO + H 2 .
또, 이때 석탄은 화학적인 충격과 열충격에 의하여 일부 분화되면서 다량의 더스트를 상당량 발생하게 되고 가스와의 열교환을 통해 승온되며, 승온된 석탄은 본 석탄예열로(5)의 하부에 설치된 분급기(6)로부터 용융환원로(1)로 장입되기에 적당한 입도의 과탄(17)과 예열도중에 발생한 분탄(16)으로 분급되어 괴탄(17)은 용융환원로(1)로 장입되고, 분탄(16)은 분탄저장조(4)로 들어가 저장된다.In addition, at this time, the coal is partially differentiated by chemical shock and thermal shock to generate a large amount of dust, and the temperature is increased by heat exchange with gas, and the heated coal is classified in the lower portion of the coal preheating furnace (5). 6) is classified into briquettes 17 having a suitable particle size to be charged into the molten reduction reactor 1, and coal powder 16 generated during preheating, and the coal briquettes 17 are charged into the molten reduction reactor 1, and the coal dust 16 Is stored in the coal dust storage (4).
상기 석탄예열로(5)를 빠져 나가면서 환원포텐셜이 높아진 가스는 도중 발생한 다량의 더스트를 포함하고 석탄과의 열교환으로 온도는 강하된다. 이 가스(24)는 고온사이클론(7)을 경유하면서 정제되어 예비환원로의 유동환원가스로 사용되게 된다. 또한, 고온사이클론(7)에서 포집된 석탄더스트(13)는 석탄저장조(4)로 들어가 분급기(6)에서 분리된 분탄(16)과 합쳐진다. 이 분탄(16)은 예비환원로(1)를 거쳐나온 배가스를 수송가스로 하여 기송되면서 괴성화장입장치(3)로 들어가 예비환원분광(11)과 함께 유동혼합된다. 이 때, 석탄의 열분해시 나오는 점 결성물질에 의해 예비환원분광(11)이 괴성화되고, 충분히 무거워진 혼합체(12)는 낙하하면서 용융환원로(1)에 중력장입되어 용융선철이 제조된다. 이때, 점결화 정도는 온도와 관계가 있고, 온도가 너무 높은 경우에 대비하여 냉각가스를 혼합하는 방법을 고려할 필요가 있다.The gas having a reduced potential as it exits the coal preheater 5 includes a large amount of dust generated on the way, and the temperature is lowered by heat exchange with coal. This gas 24 is refined via the high temperature cyclone 7 to be used as the flow reducing gas of the preliminary reduction reactor. In addition, the coal dust 13 collected in the high temperature cyclone 7 enters the coal storage tank 4 and merges with the coal dust 16 separated from the classifier 6. The powdered coal 16 is flow-mixed together with the preliminary reduction spectroscopy 11 while entering the compacted charging apparatus 3 while being fed with the exhaust gas passing through the preliminary reduction path 1 as a transport gas. At this time, the preliminary reduction spectroscopy 11 is agglomerated by the caking material released from the thermal decomposition of coal, and the sufficiently heavy mixture 12 is gravity loaded into the molten reduction reactor 1 while falling, thereby producing molten pig iron. At this time, the degree of caking is related to the temperature, it is necessary to consider the method of mixing the cooling gas in case the temperature is too high.
상기한 바와 같이 본 발명은 용융환원로에서 나오는 고온의 환원가스의 일부를 석탄예열로를 거치게 하여 석탄과 가스가 서로 반대방향으로 지나가도록 하였으며, 아울러 용융환원로 장입전에 석탄을 환원가스와 접하게 함으로써 석탄은 예열 및 건류되어 용융환원로에서 승온에 필요한 만큼의 열에너지를 절약할 수 있도록 하였고, 또한 장입되는 석탄의 탄화도를 높임으로써 수소환원으로 인한 흡열반응소요를 줄여 용융가스화로의 열적 안정화를 도모하였다.As described above, the present invention allows a portion of the high-temperature reducing gas from the melt reduction reactor to pass through the coal preheating furnace so that the coal and the gas pass in opposite directions, and the coal is contacted with the reducing gas before charging the melt reduction reactor. Coal is preheated and distilled to save the amount of thermal energy required for the elevated temperature in the melt reduction reactor. Also, by increasing the carbonization of the charged coal, the endothermic reaction demand due to the hydrogen reduction is reduced to promote thermal stabilization of the melt gasification. .
또한, 예비환원로 배가스를 이용하여 분진저장조에 저장되어 있는 분탄과 더스트를 괴성화장치에 이송시켜 예비환원된 분광석과 혼합함으로써 고온열분해되면서 나오는 점결성물질에 의해 분광을 괴성화하여 중력장입이 가능하도록 하였다.In addition, by using the exhaust gas of the pre-reduction furnace, the powdered coal and dust stored in the dust storage tank are transferred to the compacting device and mixed with the pre-reduced spectroscopy to gravitational charge by compacting the spectroscopy by the caking material coming out at high temperature pyrolysis. It was made.
한편, 압축강도가 5kgf/㎠ 이상의 괴상혼합체를 제조하기 위해서는 공급되는 탄재의 자유팽윤계수는 2이상, 예비환원분광에 대비한 탄재의 배합비는 5-20%, 반응온도는 700-850℃가 바람직한 것으로 보고되고 있다.On the other hand, in order to produce a bulk mixture having a compressive strength of 5 kgf / cm 2 or more, the free swelling coefficient of the carbon material supplied is 2 or more, the mixing ratio of the carbon material to pre-reduced spectroscopy is 5-20%, and the reaction temperature is 700-850 ° C. It is reported.
이하, 본 발명을 실시예를 통하여 구체적으로 설명한다.Hereinafter, the present invention will be described in detail through examples.
실시예Example
환원철이 고온에서 일반탄의 열분해 특성을 이용하여 직접응집법으로 괴성화될 수 있는 가능성 및 괴성화시 중력투입에 적합한 시료의 압축강도를 알아보기 위하여, 상온에서 혼합된 시료를 가지고 1600℃까지 승온이 가능한 전기로를 사용하여 실험을 수행하였다.In order to find out the possibility that reduced iron can be agglomerated by direct agglomeration using the pyrolysis property of ordinary carbon at high temperature and the compressive strength of the sample suitable for gravity injection during agglomeration, the temperature is raised to 1600 ℃ with the mixed sample at room temperature. Experiments were carried out using possible electric furnaces.
실험에 사용된 환원철 및 일반탄의 일자크기는 각각 1mm 이하를 사용하였으며, 실험을 수행하는 동안에 환원철의 재산화방지 및 일반탄의 연소를 방지하기 위하여 질소를 공급하였다.The size of the reduced iron and the coal used in the experiment was 1 mm or less, respectively, and nitrogen was supplied to prevent reoxidation of the reduced iron and combustion of the coal during the experiment.
반응온도 및 시간을 700℃, 10분으로 고정하고, 38%, 80% 및 90% 예비환원된 각각의 분광석에 대하여 일반탄의 배합비를 20%에서 60%까지 변화시켜 응집에 의한 압축강도가 분광석과 일반탄의 무게변화에 따라서 어떻게 변화하는가를 조사하고, 그 결과를 제4도에 나타내었다.The reaction temperature and time were fixed at 700 ° C. and 10 minutes, and the compressive strength due to agglomeration was changed by changing the blending ratio of ordinary carbon from 20% to 60% for each of the 38%, 80% and 90% prereduced spectroscopy. The changes in the weight of spectroscopy and ordinary coal were investigated, and the results are shown in FIG.
제4도에 나타난 바와같이, 38%, 80%, 90% 예비환원된 각각의 예비환원분광시료에 대하여 20% 이상의 일반탄을 배합한 경우의 압축강도는 예비환원분광의 환원철의 환원된 분광석의 경우 중력낙하에 적합한 압축강도 이상을 나타내고 있음을 알 수 있다.As shown in FIG. 4, the compressive strength when 20% or more of ordinary carbon is blended for each of the 38%, 80%, and 90% pre-reduced spectroscopy samples is reduced spectroscopy of reduced iron of the pre-reduced spectroscopy. It can be seen that the compressive strength is more than suitable for gravity drop.
상술한 바와 같이, 본 발명은 예비환원반응기에서 배출된 분광석을 공정중에서 발생하는 분탄을 적극 활용하여 짧은 시간내에 예비환원분광과 혼합응집함으로써 괴성화하여 하부공정인 용융환원로에 용이하게 중력으로 투입할 수 있을 뿐만 아니라, 장입되는 석탄을 예열건류하여 장입하기 때문에 용융환원로에서 흡열반응인 수소환원의 비율을 줄여 노열제어를 용이하게 하고, 석탄의 온도가 승온된 만큼의 열원을 절약할 수 있는 효과가 있는 것이다.As described above, the present invention is agglomerated by mixing and agglomeration of the spectroscopy discharged from the pre-reduction reactor with the pre-reduction spectroscopy in a short time by actively utilizing the powdered coal generated in the process to easily gravity gravity in the lower stage of the melt reduction reactor In addition to charging, the charged coal is preheated and dried to charge, reducing the ratio of hydrogen reduction, which is an endothermic reaction in the melt reduction reactor, to facilitate the control of furnaces, and to save the heat source as the coal temperature is elevated. It is effective.
또한, 본 발명은 환원가스의 환원포텐셜을 향상시켜 예비환원공정의 반응시간의 단축과 동시에 예비환원분광의 금속화율을 높여 생산성 향상에 기여함과 아울러 잉여가스의 강제냉각의 비율을 낮추어 에너지를 보다 합리적으로 사용하여 용선 생산의 원가절감에 기여할 수있는 효과가 있는 것이다.In addition, the present invention improves the reduction potential of the reducing gas to shorten the reaction time of the preliminary reduction process and at the same time increase the metallization rate of the preliminary reduction spectroscopy, thereby contributing to the improvement of productivity and lowering the ratio of forced cooling of the surplus gas, thereby reducing energy. It can be used reasonably and contribute to cost reduction of charter production.
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Cited By (5)
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| WO2005071119A1 (en) * | 2004-01-26 | 2005-08-04 | Posco | A method for manufacturing briquettes directly using coal with wide range of size, the method using the same and the apparatus using the same |
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| CN104870663A (en) * | 2012-12-21 | 2015-08-26 | 株式会社Posco | Method for reusing iron-containing by-product and apparatus therefor |
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