WO2009031368A1 - 竪型炉及びその操業方法 - Google Patents
竪型炉及びその操業方法 Download PDFInfo
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- WO2009031368A1 WO2009031368A1 PCT/JP2008/063077 JP2008063077W WO2009031368A1 WO 2009031368 A1 WO2009031368 A1 WO 2009031368A1 JP 2008063077 W JP2008063077 W JP 2008063077W WO 2009031368 A1 WO2009031368 A1 WO 2009031368A1
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- WIPO (PCT)
- Prior art keywords
- furnace
- iron
- tuyere
- coke
- less
- Prior art date
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Classifications
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- 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
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/12—Shells or casings; Supports therefor
- F27B1/14—Arrangements of linings
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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
- C21B11/02—Making pig-iron other than in blast furnaces in low shaft furnaces or shaft furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
- C21B13/023—Making spongy iron or liquid steel, by direct processes in shaft furnaces wherein iron or steel is obtained in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
- C21B7/06—Linings for furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/18—Bell-and-hopper arrangements
- C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
-
- 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
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
-
- 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
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/16—Arrangements of tuyeres
-
- 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
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/26—Arrangements of controlling devices
-
- 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/0003—Linings or walls
- F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
-
- 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 vertical furnace for producing pig iron from iron waste such as pig iron scraps and iron dust produced in a scrap or iron making process, and an operating method thereof.
- the mainstream method for producing pig iron using iron ore as the iron source is the blast furnace method.
- the blast furnace method while iron ore charged from the top of the furnace descends in the furnace, it is generated by the reaction with coke by hot air blown from the tuyere, and the inside of the furnace moves from bottom to top.
- the high-temperature reducing gas (CO) flowing through the iron ore in the iron ore is indirectly reduced at a rate of about 60% or more.
- the Cubola method is known as a manufacturing method.
- This type of vertical furnace uses an iron source with a high metallization rate that does not require reduction. Therefore, like the blast furnace method, the front of the tuyere in the furnace is used. Raceway sky After the exothermic reaction (c + 0 2 ⁇ co 2 ) of the cox (C 2 ) due to oxygen (0 2 ) in the air, the co 2 gas and cox (
- oxygen is enriched from the tuyere under conditions of a low blowing speed that does not form a raceway in front of the tuyere in the furnace.
- the solution loss is less likely to occur compared to the blast furnace cox.
- Coke was used as solid fuel. Faux coke has a larger particle size, higher strength, and less ash than blast furnace coke.
- Coke for porridge has a large particle size, so the reactivity of the solution loss reaction is low, and because of its large particle size, high strength, and low ash content, the amount of pulverization and slag generation in the furnace It is advantageous compared to blast furnace coke in that the amount is small and the air permeability in the furnace is excellent.
- Steel dos iron contains a lot of iron oxide and has a lower metallization rate than iron scrap, so in addition to the melting function of conventional iron sources of vertical furnaces such as Cubola, Needed to reduce iron oxide contained in It has come to be.
- Japanese National Publication No. 0 1-5 0 1 0 1 uses a blast furnace having a secondary tuyere and a melting furnace having a primary tuyere and a hearth having a larger diameter than the blast furnace.
- a method has been proposed in which only an iron source consisting of scrap metal and self-reducing ore is introduced from the top of the blast furnace furnace onto a fuel bed made of small-diameter coke located at the joint between the blast furnace and the hearth.
- the self-reducing ore is directly smelted with the small-diameter coke of the fuel bed in the hearth, and the heat that lowers the heat of fusion due to this endothermic reaction at the secondary tuyere of the blast furnace.
- CQ C_ ⁇ 2 / (C_ ⁇ + C_ ⁇ 2)
- this method has problems such as a decrease in air permeability due to direct melting and reduction of self-reducing ore in the hearth and an increase in consumption of bet coke due to carburizing of hot metal.
- direct smelting reduction of self-reducing ore in the hearth is an endothermic reaction, this reduces the temperature of the hearth. As a result, the dredging becomes unstable, the wind is reduced, and the wind must be rested, causing drastically reduced pig iron productivity.
- Japanese Patent Laid-Open No. 10-0 3 6 9 0 6 discloses that a dust agglomerated or self-reducing ore is formed on the cox bed filled in the lower part of the furnace from the top of the vertical furnace. From a two-stage tuyere that is loaded in the height direction of the furnace wall and charged with iron sources that need to be reduced, such as lump, iron scraps that only need to be melted, iron sources such as pig iron, and small-diameter coke Or, in an operation method in which reduction and dissolution are performed by blowing an oxygen-containing gas of 60 ° C or less, is it optimal for reduction and dissolution based on the average metallization rate of the iron source? e . An operation method has been proposed in which the (gas utilization rate) is calculated and the 7 C fl of the exhaust gas is controlled within the optimum range by adjusting the furnace height of the charge.
- an iron source with a high metallization rate that does not require reduction is mixed with coke having a relatively large particle size and charged into the center of the furnace, and the metallization rate that requires reduction.
- Low iron source is mixed with small-diameter coke and charged in the periphery of the furnace, and the height of the coke bed at the bottom of the furnace and / or the height of the charge in the furnace is adjusted to reduce and dissolve.
- Japanese Laid-Open Patent Publication No. 09-2 0 3 5 8 4 also describes that a self-reducing ore, dust agglomerate, iron sources such as iron scrap, raw fuel such as small-diameter coke, etc. are installed in a vertical furnace.
- two or more charges of raw fuel charging are defined as one cycle, and for each cycle, iron cores such as iron scraps that do not require reduction at the center of the furnace and a large diameter coke (particle size 60 mm or more), and in the periphery of the furnace, iron sources such as self-reducing ores that require reduction, dust agglomerates, etc.
- the ratio of the area from the tip of each tuyere to the center of the furnace to the area from the wall of the furnace body to the center of the furnace (the ratio of the tuyere tip area) is 3 Cubola with tuyere provided to be in the range of 2 to 4 2%, and using this cubola, the hot metal is melted by the cubola that melts the cold iron source using coke as the main fuel The method is described.
- the vertical furnace is operated by using a large amount of blast furnace coke having a small particle size, high ash content, and low strength as compared with the soot coke.
- the pressure loss in the furnace becomes large, and depending on the operating conditions, the operation is performed under high furnace pressure conditions exceeding 20 O h Pa.
- iron sources iron sources that require reduction
- dust agglomerates and self-reducing ores agglomerates with a high carbon content
- the present invention reduces the pressure inside the furnace when the wind is reduced or rested when operating at a high furnace pressure using a solid raw material containing a large amount of coke for blast furnace. Prevents tuyere melting troubles caused by slag rise caused by this, and compensates for reduction of heat in the furnace caused by coke solution loss reaction, enabling operation at low cost and high productivity
- a vertical furnace and a vertical furnace operating method using the vertical furnace are provided.
- an iron source with a high metallization ratio of 95% or more of average metallization ratio and coke for blast furnace 70 to 100 mass Is a vertical furnace in which a solid fuel blended in a layered or mixed state is blown from the tuyeres at the bottom of the furnace to melt the iron source and produce pig iron,
- an iron source having a low metallization rate with an average metallization rate of less than 95% is used as the iron source.
- the thermal conductivity of the refractory placed on the shaft, tuyere periphery, furnace bottom side wall, and furnace bottom floor is 2 WZm * k or less, 6 WXm 6 W / m ⁇ k or less, and 2 W / m ⁇ k or less, and the thickness of the lining refractory is 400 mm or more, 5500 mm or more, 5500 mm or more, and 2 The vertical furnace as described in (1) or (2) above, wherein the vertical furnace is 0 mm or more.
- the iron source having a high metallization rate is composed of one or more of iron scrap, pig iron, porcelain scrap, hot pricket pig iron (MB I), and direct reduced iron (DR I).
- the average metallization rate is 95% or more from the top of the cox bed filled in the lower part of the furnace.
- An iron source with a high metallization rate and a solid fuel containing 70 to 100% by mass of blast furnace coke in a layered or mixed state and blown from the tuyeres at the bottom of the furnace Is a method of operating a vertical furnace to melt pig iron and produce pig iron,
- the gas flow rate in the furnace is 1 NmZ s or more. Control the amount of blown air
- a method of operating a vertical furnace characterized by that.
- an iron source having a low metallization rate with an average metallization rate of less than 95% may be used as the iron source.
- the thermal conductivity of the refractory placed on the shaft, tuyere periphery, furnace bottom side wall, and bottom of the furnace bottom is 2 W / m'k or less, 6 W / m ⁇ k or less, 6 W / m ⁇ k or less, and 2 W / m ⁇ k or less, and the thickness of the lining refractory is 400 mm or more, 5500 mm or more, 5 5
- the iron source having a high metallization rate is composed of one or more of iron scrap, pig iron, porcelain scrap, hot briguet iron (MB I), and direct reduced iron (DRI).
- the tuyere of the vertical furnace Ensure sufficient depth from the bottom to the bottom of the furnace, and optimize the height of the tuyere's tuyere and the heat dissipated in the furnace body from the shaft to the bottom of the bottom of the furnace. It is possible to prevent the tuyere melting damage caused by the slag rise when the furnace pressure at the time decreases, and to compensate for the reduction of heat quantity in the furnace due to the coke solution loss reaction.
- FIG. 1 is a view showing an embodiment of a vertical furnace of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- Figure 1 shows one aspect of the vertical furnace.
- the vertical furnace 1 basically has a tuyere 6 provided in the lower part of the furnace body 2, a gas suction part 4 provided in the upper part of the furnace body 2, and the gas suction part 4 penetrating into the gas furnace 1. It consists of the furnace top 3 provided.
- the tuyere 6 is basically provided in the height direction of the furnace in two stages, the upper tuyere 6a and the lower tuyere 6b, and the upper tuyere 6a is a coke base filled in the lower part of the furnace.
- the lower tuyere 6 b is provided at a height position in the cockbet 8.
- the tuyere diameter is set so that the air blowing speed is slower than the blast furnace so as not to create a raceway at the tuyere.
- the tuyere is not limited to two stages, but can be performed in one stage depending on the blowing conditions.
- the coke is mainly burned by blowing air at room temperature or below 600 ° C from the lower tuyere 6 b. is, by blowing room temperature air from the upper tuyeres 6 a, by burning some combustion gas (C_ ⁇ 2) coke CO gas generated in Sorushi Yo Nrosu reactions, by Sol one Shiyonrosu reaction (endothermic) Compensates for a decrease in heat of fusion of the iron source
- lower tuyere When blowing from the first tuyere, lower tuyere is installed at the same height as the lower tuyere 6 b above to promote coke combustion and increase the heat of fusion of the iron source. It is necessary to enrich oxygen in the following air at room temperature or 600 0 blown from 6 b and increase the oxygen concentration
- the air when the air is blown from the two-stage tuyere shown in Fig. 1, the amount of heat can be compensated by the air blown from the upper tuyere 6a, so that the room temperature blown from the lower tuyere 6b or below 600 ° C It is not always necessary to enrich oxygen in the air, promote coke combustion, and increase the heat of fusion of the iron source.
- the raw fuel 10 is cut out from each raw material hopper, weighed by a weigher, and then accommodated in a packet 7 which is a charging device. Through this bucket 7, The solid fuel and the iron source are charged in a layered or mixed state from the top 3 of the furnace 1 onto the coke bed 8 formed in the lower part of the vertical furnace 1.
- the solid fuel and the iron source are charged in layers in the packet 7, and the bottom of the packet 7 is opened and charged in the furnace. Since solid fuel and iron source partly mix at the time of falling, the solid fuel and iron source are mainly charged in a layer of solid fuel and iron source, and part of it is mixed state of solid fuel and iron source It is inserted in.
- the stacking height (stock level) of the raw fuel 10 is adjusted to the upper height position in the top 3 of the furnace, and the range of the height in the upper direction from the gas suction part 4 in the top 3 of the furnace 10
- the top of the furnace (opening) is sealed (this is called the material seal).
- the deposition height (stock level) level of the raw fuel 10 decreases as the raw fuel decreases due to the melting of the raw fuel 10.
- a level meter (not shown) is installed inside the furnace top 3, and the stack height of the raw fuel 10 ( Stock level is measured, and the charging timing of raw fuel 10 is controlled so that the stock level is maintained at a predetermined level.
- the iron source in raw fuel 10 charged from above the top of vertical furnace 1 is the combustion of coke (C) by oxygen in the air blown from tuyere 6 while descending the furnace.
- Iron oxide that is dissolved by heat and partially contained in the iron source is reduced by reducing gas (CO), solid carbon (C), or carbon in hot metal ([C]).
- Cusbed 8 descends and accumulates at the bottom of the furnace.
- a connecting pipe 12 connected to the storage tank 1 1 provided outside the furnace is provided, and the hot metal accumulated at the bottom of the furnace is After flowing into the storage section 1 1 outside the furnace through the connecting pipe 1 2 and separated into the hot metal (slag) and the lower layer of the hot metal, the lower layer of hot metal Taken from 9.
- the smelting reduction zone where the iron source is melted and partially reduced mainly consists of a range of about 1 to 2.5 m in the furnace height direction from the surface of the coxbed 8 ( (Corresponding to about 1 to 2.5 charges of the raw fuel contained in the packet 7).
- a solid fuel containing 70 to 100% by mass of blast furnace coke is used as the solid fuel.
- Blast furnace coke is cheaper than pork coke and is manufactured in an iron making process, so it can be obtained stably.
- the blending ratio of blast furnace coke in solid fuel is set to 70 mass% or more. .
- the blast furnace coke blended in the solid fuel in an amount of 70% by mass or more has properties such that the particle size is small, the ash content is high, and the strength is low as compared with the ordinary soot coke.
- the particle size of ordinary clay coke has a maximum particle size of 300 mm or less, an average particle size of 80 mm or more, and an ash content of 9% or less.
- the present invention Use a blast furnace coke with a maximum particle size of 72 mm or less, an average particle size of 60 mm or less, and an ash content of 9% by mass or more.
- the rate of pulverization due to the destruction of coke increases due to the addition of load in the furnace when the coke is charged, the air permeability in the furnace decreases, and the pressure loss decreases. Causes to rise.
- the particle size of the blast furnace coke used in the present invention is preferably 40 mm or more, and the ash content is preferably 14% or less.
- the increase in furnace pressure during operation is also affected by the iron source, and when melting and reducing an iron source with a low metalization rate compared to melting only an iron source with a high metalization rate, Increased furnace pressure during operation.
- the iron source is classified into an iron source having a high metallization rate having an average metallization rate of 95% or more and an iron source having a low metallization rate having an average metallization rate of less than 95%.
- iron sources with a high metallization rate with an average metallization rate of 95% or more include iron scrap, pig iron, porcelain scrap, hot briquette iron (MBI), and direct reduced iron (DRI). This means an iron source that has a high conversion rate and requires only melting (reduction is not required).
- examples of iron sources with a low average metalization rate of less than 95% include das slag agglomerates and self-reducing ores (agglomerates with a high carbon content). Low metalization rate means an iron source that needs to be reduced. In addition to the iron source having a high metallization rate, the average metallization rate is 9%.
- the slag generated by the melting and reduction of iron oxide in the iron source having a low metallization rate is generated in the furnace. This reduces the air permeability of the furnace, so the furnace pressure tends to increase.
- the present invention solves the problem of the tuyere erosion failure and the reduction of heat generated in the operation of a vertical furnace in which an iron source is melted, melted or reduced using a solid raw material containing a large amount of coke for blast furnace.
- a vertical furnace in which an iron source is melted, melted or reduced using a solid raw material containing a large amount of coke for blast furnace.
- the furnace bottom of the vertical furnace body is composed of a storage part provided outside the furnace body and a connecting pipe. Since it has a connected pipe connection structure (siphon structure), operation is possible up to the furnace pressure (gas pressure) that balances the pressure of the hot metal accumulated in the storage section.
- a solid fuel containing 70% by mass or more of blast furnace coke having a maximum particle size of 72 mm or less, an average particle size of 60 mm or less, and an ash content of 9% by mass or more.
- the lowest tuyere position in the furnace height direction assumes that the maximum furnace pressure during operation is 30 O h Pa, and the maximum furnace pressure condition during this operation Slag height level (top position of hot metal )
- the position of the bottom tuyere in the furnace height direction is the distance from the tuyere bottom surface to the top of the bottom of the furnace bottom. The position was at least 0.7 times the furnace diameter.
- the reason why the bottom tuyere position in the furnace dredging direction is defined as a relative value to the furnace diameter at the tuyere bottom surface is that the amount of slag rise when the furnace pressure drops due to the difference in the furnace diameter of the vertical furnace Because changes.
- the tuyere height level is less than 0.7 times the furnace diameter from the bottom of the furnace, when the gas pressure in the furnace decreases, such as when the wind is reduced or not, The stored hot metal rises to near the feather level, causing the tuyere to melt.
- the blast pressure of the melting furnace of the present invention is not less than 3 5 O h Pa in accordance with the design pressure in the furnace of 300 h Pa or less. It is preferable to equip a blower having the ability of
- the internal volume in the furnace height range from the shaft to the bottom of the furnace bottom The heat dissipated in the furnace must be 0.15 MwZm 3 or less.
- the heat dissipated in the furnace body per inner volume in the furnace height range from the shaft to the bottom of the furnace is 0.15 MwZm 3 or less.
- Thermal conductivity of the lined refractory placed in each part ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4, and the same thickness L l, L 2, L 3, and L 4, and shaft The relationship between the heat dissipated in the furnace body per volume in the furnace height range from the bottom to the bottom of the furnace is shown as follows.
- ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4 are the refractories of the lining refractories disposed in the vertical furnace shaft, the tuyere periphery, the furnace bottom side wall, and the furnace bottom base plate, respectively.
- Thermal conductivity (WZm k), L l, L 2, L 3, And L4 indicate the thickness (mm) of the lined refractory placed on the vertical furnace shaft, tuyere periphery, bottom wall, and bottom wall of the vertical furnace.
- T ik is the furnace side wall temperature of the refractory (related to the furnace conditions) (° C)
- T. k is the furnace outer wall temperature of the refractory (related to cooling conditions) (° C)
- S k is the surface area (m 2 ) of each part
- V is the furnace volume (m 3 ).
- the thermal conductivity and thickness of the lined refractory placed in each vertical part of the vertical furnace depends on the state of the raw material (solid, gas, melted) and the degree of thermal load in each part. Considering this, it is designed within the specified range of heat dissipation from the furnace body.
- the thermal conductivity of the lining refractories placed on the shaft part, tuyere peripheral part, furnace bottom side wall part, and furnace bottom base plate is 2 WZm'k or less and 6 W / m-k or less, respectively.
- the thickness of the lining refractory is 400 mm or more, 5500 mm or more, 5500 mm or more, respectively.
- the thickness is preferably 200 mm or more.
- the present invention uses the vertical furnace having the above-mentioned characteristic features of the present invention to use a large amount of inexpensive blast furnace coke as a solid raw material, and further to reduce the iron source.
- an iron source with low required metallization rate and operating under high furnace pressure conditions it is possible to prevent tuyere melting trouble due to slag rise when the furnace pressure drops, and coke sol Reduction in the amount of heat in the furnace due to the reaction can be suppressed.
- the operating method of the vertical furnace of the present invention preferably defines the following operating conditions for the following reasons.
- the amount of air blown from the tuyere is controlled.
- gas utilization rate (the top gas (C_ ⁇ 2) / (CO + C_ ⁇ 2)) is, for example, be a 2 0% or less of low-level, stable operation
- the top gas (C_ ⁇ 2) / (CO + C_ ⁇ 2) is, for example, be a 2 0% or less of low-level, stable operation
- the reducing gas with high CO concentration can be used effectively, and the reduction of iron oxide in the raw material proceeds stably. Therefore, it is possible to produce hot metal in which reduction and dissolution are compatible.
- the conditions of the examples are one example of conditions used to confirm the feasibility and effects of the present invention.
- the present invention is not limited to this one condition example.
- the present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
- the vertical furnace shown in Fig. 1 was charged with iron source and solid fuel (coke) under the raw fuel compounding conditions shown in Table 1, and operated for 7 days under the charging conditions shown in Table 3.
- Gas utilization rate of furnace top exhaust gas (7) co ), furnace top exhaust gas temperature (° C), furnace pressure. (HPa), ventilation pressure (k Pa), number of wind reductions (times), rest Wind frequency (times) and production rate (TZH) were measured.
- Table 4 shows the position (mm) of the bottom tuyere of the vertical furnace used in the present invention example and the vertical furnace used in the comparative example, the shaft part, the tuyere peripheral part, the furnace bottom side wall part, and Thermal conductivity (w / mk) and thickness (mm) of the lined refractory placed on the bottom of the furnace bottom, heat dissipation from the furnace body per unit volume in the furnace height range from the shaft to the bottom of the furnace bottom (Mw / m 3 ).
- the average metallization rate M is
- M (metallic iron in the iron source (M. F e) (mass%)) / (ton in the iron source Overnight iron (T. F e) (mass%))
- Invention Examples 1 to 4 maintain a high furnace pressure because the amount of air blown from the tuyere is controlled so that the superficial gas flow rate in the furnace is 1 N m / s or more. As a result, hot metal could be produced with higher productivity.
- Comparative Examples 1 to 5 shown in Table 4 are vertical types in which the lowermost tuyere position and the heat dissipated in the furnace body per inner volume from the shaft to the bottom of the furnace do not satisfy the conditions specified in the present invention. Since a furnace was used, increasing the blending ratio of blast furnace coke resulted in an increase in furnace pressure and a decrease in ca , and at most, only 40% of blast furnace coke could be blended. From these results, when the present invention is applied, a large amount of inexpensive blast furnace coke is used as a solid raw material, and the operation is performed at a high pressure in the furnace.
- the present invention it is possible to reduce the manufacturing cost of pig iron when producing pig iron using raw iron waste such as scrap scrap or iron scrap generated in the scrap or iron making process as well as productivity. High operation can be performed stably. Therefore, the industrial contribution by the present invention is great.
Abstract
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EP08778303A EP2202324A4 (en) | 2007-09-07 | 2008-07-14 | VERTICAL OVEN AND OPERATING METHOD THEREFOR |
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JP2007-233287 | 2007-09-07 | ||
JP2007233287 | 2007-09-07 | ||
JP2008177087A JP4350153B2 (ja) | 2007-09-07 | 2008-07-07 | 竪型炉及びその操業方法 |
JP2008-177087 | 2008-07-07 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010242201A (ja) * | 2009-04-09 | 2010-10-28 | Nippon Steel Corp | 竪型溶解炉の操業方法 |
JP2012207290A (ja) * | 2011-03-30 | 2012-10-25 | Nippon Steel Corp | 竪型溶解炉の操業方法 |
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JP5747775B2 (ja) * | 2011-10-11 | 2015-07-15 | 新日鐵住金株式会社 | 竪型溶融炉 |
WO2014190391A1 (en) * | 2013-08-19 | 2014-12-04 | Gomez Rodolfo Antonio M | A process for producing and reducing an iron oxide briquette |
JP6036744B2 (ja) * | 2014-04-16 | 2016-11-30 | Jfeスチール株式会社 | 竪型炉の羽口部構造及び竪型炉並びに乾留生成物の製造方法 |
CN111638316B (zh) * | 2020-05-29 | 2022-09-16 | 鞍钢股份有限公司 | 一种模拟高炉高温段焦炭反应装置及方法 |
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JP2012207290A (ja) * | 2011-03-30 | 2012-10-25 | Nippon Steel Corp | 竪型溶解炉の操業方法 |
Also Published As
Publication number | Publication date |
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JP4350153B2 (ja) | 2009-10-21 |
JP2009079289A (ja) | 2009-04-16 |
EP2202324A4 (en) | 2010-09-15 |
EP2202324A1 (en) | 2010-06-30 |
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