EP2202323A1 - Four vertical - Google Patents

Four vertical Download PDF

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Publication number
EP2202323A1
EP2202323A1 EP08778301A EP08778301A EP2202323A1 EP 2202323 A1 EP2202323 A1 EP 2202323A1 EP 08778301 A EP08778301 A EP 08778301A EP 08778301 A EP08778301 A EP 08778301A EP 2202323 A1 EP2202323 A1 EP 2202323A1
Authority
EP
European Patent Office
Prior art keywords
furnace
steel cylinder
right circular
guide member
circular steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08778301A
Other languages
German (de)
English (en)
Other versions
EP2202323A4 (fr
Inventor
Yasuhiko Omatsu
Akihiko Shinotake
Kazushi Akagi
Masaaki Naito
Jun Tsubota
Zen-Etsu Kikuchi
Shin Murase
Hans Jaan Lachner
Michel Lemperle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kuettner GmbH and Co KG
Nippon Steel Corp
Original Assignee
Kuettner GmbH and Co KG
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kuettner GmbH and Co KG, Nippon Steel Corp filed Critical Kuettner GmbH and Co KG
Publication of EP2202323A1 publication Critical patent/EP2202323A1/fr
Publication of EP2202323A4 publication Critical patent/EP2202323A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F27B1/20—Arrangements of devices for charging
    • 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
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
    • 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
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/0025—Charging or loading melting furnaces with material in the solid state
    • F27D3/0027—Charging vertically with corbs
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/0033—Charging; Discharging; Manipulation of charge charging of particulate material
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/10—Charging directly from hoppers or shoots

Definitions

  • This invention relates to a vertical furnace provided above the furnace top with a charging unit for separately charging raw materials with different properties and in an upper furnace unit with a right circular cylinder installed for partitioning the deposition zones of the separately charged raw materials.
  • ⁇ CO combustion efficiency
  • the usual practice is to inhibit the solution loss reaction after coke combustion by using large grain size coke for foundries.
  • Another mode of vertical furnace operation that has recently been put into practice uses self-reducing ore pellets and iron scraps as the principal materials and melts the iron scraps while concomitantly reducing the self-reducing ore pellets.
  • Patent Application Publication Hei 01-501401 teaches a melting furnace of complicated body structure that uses fine coke and a large amount of self-reducing ore pellets and melts iron scraps at a high combustion efficiency ⁇ CO .
  • Japanese Patent Publication (A) No. H10-036906 teaches an improvement on the operating method of charging an iron source requiring reduction, an iron source requiring only melting, and solid fuel into a vertical furnace and conducting reduction and melting by blowing in oxygen-enriched air of normal temperature or 600 °C or less through tuyeres provided in the furnace wall, wherein the improvement lies in conducting a calculation based on the average iron source metallization rate to determine the optimum combustion efficiency ⁇ CO (gas utilization rate) for the reduction and melting, and regulating the height of the furnace charge to control the ⁇ CO of the exhausted gas to the optimum range.
  • ⁇ CO gas utilization rate
  • this method restricts the mixing ratio of the iron sources because it requires the optimum ⁇ CO (gas utilization rate) to be calculated every time the mixing ratio of the iron source requiring reduction and the iron source requiring only melting changes.
  • this operating method top-charges high-metallization-rate iron source into the furnace center region and low metallization rate iron source mixed with solid fuel into the furnace peripheral region, the height of the coke bed at the bottom of the furnace must be regulated.
  • the weight ratio of the C in the solid fuel to the Fe in the iron source must be made 0.01 to 0.05, and the charging level (stock level) at the furnace periphery relative to that at the furnace center must be varied in accordance with the average metallization rate of the iron source.
  • Japanese Patent Publication (A) No. H09-203584 and Japanese Patent 3586355 respectively teach a method of charging raw materials and a charging hopper for charging raw materials aimed at enabling efficient, stable operation over the long term, without lowering the combustion efficiency ⁇ CO of the solid fuel, while also avoiding charge hanging.
  • the raw material charging method taught by Japanese Patent Publication (A) No. H09-203584 is characterized in that, at the time of charging self-reducing ore pellets, dust agglomerates, iron scraps and other iron sources, and fine-grain solid fuel and other raw materials into a vertical furnace, the weight ratio and the like of iron sources to solid fuel is varied at every charge, and the furnace peripheral region and furnace center region are separately charged.
  • the method is not always the best for an actual operation because complex procedures are required in order to vary the weight ratio and the like of the iron sources to the solid fuel at every charging.
  • Japanese Patent Publication (A) No. H09-203584 sets out a charging mode in which a charging guide is used at the time of charging to separately charge the furnace periphery region and center region (see FIG. 3 ). But when the charged raw materials are deposited on the existing raw materials, they flow into the furnace peripheral region or center region and do not necessarily accumulate at the predetermined region, so that the expected effect sometimes cannot be realized.
  • the raw material charging hopper proposed by Japanese Patent 3586355 comprises a guide unit for selectively charging raw materials into the furnace center region and furnace peripheral region, which is equipped with a conical bell and a horizontally moveable raw material guide member that is provided at the bottom with a discharge port divided multiply in the radial direction and reduced in diameter downward like a taper. But when the raw materials passing through the guide unit are deposited on the existing raw materials, they flow into the furnace peripheral region or center region and do not necessarily accumulate at the predetermined region, so that the expected effect sometimes cannot be realized.
  • this invention addresses the issue of separately charging raw materials with different properties from the top of the furnace and ensuring that the charged raw materials accumulate at the predetermined regions as intended.
  • the object of the invention is, by finding means for dealing with this issue, to provide a vertical furnace capable of conducting efficient, stable operation over the long term, without lowering the combustion efficiency ⁇ CO of the solid fuel, while also avoiding charge hanging.
  • the inventors studied raw material charging means for overcoming the aforesaid issues in a vertical furnace provided in its top peripheral wall with a gas intake port and operated with an upper furnace unit sealed by raw materials present inside the furnace above the gas intake port. But, as discussed in the foregoing, they found that expedients focusing solely on the raw material charging mode cannot provide a solution. In light of this situation, the inventors carried out an in-depth study looking beyond just the charging mode to also include the structure of the upper furnace unit where the raw materials are deposited.
  • the present invention was accomplished based on this finding, and the gist thereof is as set out below.
  • This invention provides a vertical furnace capable of conducting efficient, stable operation over the long term, without lowering the combustion efficiency ⁇ CO of the solid fuel, while also avoiding charge hanging.
  • FIG. 1 shows one mode of implementing the vertical furnace according to the present invention (the invention furnace), in the condition uncharged with raw materials.
  • the vertical furnace designated by reference numeral 1, composed basically of a furnace body 2 equipped at the lower part with upper tuyeres 6a and lower tuyeres 6b, a gas intake 4 provided in the upper part of the furnace body 2, and an upper furnace unit 3 installed to pass through the gas intake 4 and seal the upper part of the vertical furnace 1 with raw materials contained therein.
  • the furnace top 3 is constituted as a shell and the exterior of the portion inserted into the gas intake 4 is covered with a refractory.
  • the tuyeres are basically composed of the upper tuyeres 6a and lower tuyeres 6b provided in two tiers in the direction of furnace height.
  • the upper tuyeres 6a are installed immediately above the surface of a coke bed 20 charged into the lower part of the furnace, and the lower tuyeres 6b are installed at a height within the coke bed 20.
  • the tuyere diameter is defined so that the blast velocity is slower than in a blast furnace. Whilst the furnace of this embodiment is equipped with tuyeres arranged in two tiers, the invention is not limited to this configuration and, depending on the blast conditions, operation is possible using tuyeres arranged in a single tier.
  • the tuyeres When air is blown in through a single tier of tuyeres, the tuyeres are installed at the same height as the lower tuyeres 6b. In this case, it is necessary to promote coke combustion so as to generate more iron source melting heat by increasing the oxygen concentration, i.e., by oxygen-enriching the air of room temperature or 600 °C or less blown in through the tuyeres.
  • the raw materials to be reduced or melted in the vertical furnace 1 are fed out from their respective hoppers (not shown). Each is weighed with a weight scale (not shown), then fed into a bucket 9 serving as a charging unit, transported as contained in the bucket 9 to above the furnace top 3, and charged from the bucket 9 through the furnace top 3 of the common rail 1 onto a coke bed 20 formed at the bottom of the vertical furnace 1 so that solid fuel and iron source assume a layered or mixed state.
  • the fuel used is fine carbonaceous solid fuel.
  • the fuel consists mainly of a large amount of fine coke (blast furnace coke).
  • raw materials are used a combination of iron sources requiring only melting, such as hot briquetted iron (HBI), direct reduced iron (DRI), iron scraps, formed iron and the like, and iron sources requiring reduction, such as self-reducing ore pellets (C-containing agglomerates), reduced iron of low metallization rate and the like.
  • the invention furnace is equipped with a right circular steel cylinder 7 supported inside the furnace top 3 by a right circular cylinder support 8 so that its lower end extends to near the upper end of the gas intake 4.
  • Raw materials with different properties are deposited inside and outside of the right circular steel cylinder 7.
  • the invention furnace is structurally characterized in the point that the installation of the right circular steel cylinder inside the upper furnace unit enables the furnace to conduct efficient, stable operation over the long term, without lowering the combustion efficiency ⁇ CO of the solid fuel, while also avoiding charge hanging.
  • the right circular steel cylinder is preferably made of stainless steel excellent in abrasion resistance.
  • the area of right circular steel cylinder opening is determined in accordance with the weight ratio of the raw materials to be separately charged inside and outside the right circular steel cylinder 7.
  • the right circular steel cylinder is attached within the upper furnace unit 3 by the right circular cylinder support 8, it can be suitably exchanged.
  • furnace efficient and stable operation over the long term, without lowering the combustion efficiency ⁇ CO of the solid fuel, while also avoiding charge hanging, is achieved, even when using a large amount of fine coke (blast furnace coke), by charging and accumulating the raw materials inside and outside the right circular steel cylinder separately in accordance with their properties.
  • iron sources requiring only melting, or such iron sources and solid fuel (hereinafter sometimes called “melt raw materials”)
  • melt raw materials iron sources requiring reduction, or such iron sources and solid fuel
  • reduction raw materials iron sources requiring reduction, or such iron sources and solid fuel
  • reference numeral 10 designates an inverted conical guide member that operates in cooperation with the right circular steel cylinder 7 mounted inside the upper furnace unit 3 to charge melt raw materials inside the right circular steel cylinder 7.
  • the inverted conical guide member 10 is provided at the bottom with an opening of a diameter approximately equal to the diameter of the right circular steel cylinder 7.
  • the melt raw materials contained in the bucket 9 therefore pass through the bottom opening of the inverted conical guide member 10 to be charged into and accumulate inside the right circular steel cylinder 7.
  • FIG. 1 Also shown in FIG. 1 is a conical guide member 11 for charging reduction raw materials between the inner wall of the upper furnace unit and the right circular steel cylinder 7.
  • the conical guide member 11 is shown in a standby location in the drawing. However, in the course of operation, the inverted conical guide member 10 and conical guide member 11 are independently moved from their respective standby locations by a seat/unseat mechanism to be placed on top of the right circular steel cylinder 7 in accordance with a raw material charging schedule.
  • the bottom of the conical guide member 11 is of a size that fits into the furnace top.
  • the bottom surface is formed at the middle with a conical bottom portion of approximately the same diameter as that of the right circular steel cylinder 7 and the periphery with an opening for passage of raw material.
  • the seat/unseat mechanism is hydraulically operated to place one or the other of the inverted conical guide member and the conical guide member on top of the right circular steel cylinder.
  • FIG. 2(a) shows the inverted conical guide member placed on top of the right circular steel cylinder
  • FIG. 2(b) shows the conical guide member placed on top of the right circular steel cylinder.
  • a base 18 is provided on the working floor.
  • a shaft fixation member 16 for fixing a shaft 15 that rotatably supports a guide member support frame 14 retaining the associated guide member, a hydraulic mechanism 12 whose one end is connected to the guide member support frame 14 near the shaft 15, and support members 17 that support the opposite ends of the guide member support frame 14 when the associated guide member is placed on top of the right circular steel cylinder 7.
  • a counterweight 13 is attached to one end of each guide member support frame 14 to enable smooth rotation of the guide member support frame 14 by the associated hydraulic mechanism 12.
  • FIG. 2(a) shows the inverted conical guide member 10 placed on top of the right circular steel cylinder 7 at the upper furnace unit 3, and the conical guide member 11 retracted to the standby location.
  • the bottom of the bucket (not shown) is opened to charge melt raw materials X inside the right circular steel cylinder 7.
  • the hydraulic mechanisms 12 are driven to retract the inverted conical guide member 10 to its standby location and place the conical guide member 11 on top of the right circular steel cylinder 7, as shown in FIG. 2(b) .
  • the bottom of the bucket (not shown) containing reduction raw materials Y is opened to commence charging of the reduction raw materials Y.
  • the hydraulic mechanisms 12 are operated under the control of a hydraulic mechanism controller (not shown).
  • the hydraulic mechanism controller drives the hydraulic mechanisms 12 in accordance with a raw material charging schedule to charge raw materials with different properties (the melt raw materials X and reduction raw materials Y) into prescribed regions (inside and outside the right circular steel cylinder 7) at the start of operation and in the course of operation. This is a characterizing feature of the present invention.
  • the seat/unseat mechanism shown in FIG. 2 is a rotation mechanism that causes the conical guide member and the inverted conical guide member to move independently from standby locations, within vertical planes, around shafts (support points) provided on opposite sides of the furnace top to place them on and retract them from the right circular steel cylinder.
  • the mechanism for seating and retracting the conical guide member and inverted conical guide member is not limited to this rotation mechanism.
  • the rotation mechanism can instead be one that that rotates the conical guide member and the inverted conical guide member from standby locations within horizontal planes around support points provided on opposite sides or one side of the furnace top to seat directly on the right circular steel cylinder.
  • the seat/unseat mechanism can be one equipped with a reciprocating mechanism that drives a long structural member having the conical guide member and the inverted conical guide member mounted on its opposite ends to reciprocate within a horizontal plane across the furnace top.
  • it can be one equipped with a reciprocating mechanism that reciprocates a carriage on which the conical guide member and the inverted conical guide member are mounted across the furnace top.
  • FIG. 3 shows the state in which the melt raw materials X and reduction raw materials Y are deposited in the vertical furnace during operation.
  • the invention vertical furnace is operated with raw materials deposited in the upper furnace unit 3 located above the gas intake, thereby forming a sealed zone in the upper furnace unit (called a "material seal") that seals the furnace top.
  • the iron sources in the raw materials charged into the upper furnace unit of the vertical furnace 1 from above are melted during descent within the furnace by the heat of coke (C) combustion by oxygen in the air blown in through the tuyeres, and the iron oxide contained in some of the iron sources is reduced by reduction gas (CO), solid carbon (C), or carbon (C) in the molten iron, to further descend to the coke bed 20 and accumulate at the furnace bottom.
  • C coke
  • a connecting pipe 23 communicating with a pig and slag storage unit 22 provided outside the furnace is installed at the height level of the upper surface of a bottom plate of the furnace bottom, and molten pig and slag accumulated at the bottom inside the furnace flow through the connecting pipe 23 into the pig and slag storage unit 22.
  • the upper molten slag layer and lower molten pig layer of the molten pig and slag are separated, and the molten pig of the lower layer is extracted through a tap hole 21.
  • the melting and reduction zone where the melting and part of the reduction of the iron sources is conducted is formed mainly within the furnace height range of about 1 to 2.5 m above the surface of the coke bed 20 (equivalent to about 1 to 2.5 charges of the raw material contained in the bucket 9).
  • the raw materials descend without mixing together during operation because the melt raw materials X and reduction raw materials Y are separately charged inside and outside the right circular steel cylinder 7 so that the are deposited inside and outside the right circular steel cylinder 7 where they cannot mix with each other.
  • the melt raw materials X and reduction raw materials Y are present one inside and one outside the right circular steel cylinder 7 where they form descending flows that do not interfere with each other.
  • melt raw materials X and reduction raw materials Y make contact and mix to some degree after passing beyond the right circular steel cylinder 7, each continues its descending flow, so that a highly orderly state of raw material deposition can be realized wherein the melt raw materials X are deposited in the middle portion inside the furnace body 2 of the invention furnace and the reduction raw materials Y are deposited in the surrounding region. This is the most salient characteristic of the invention furnace.
  • air (sometimes oxygen-enriched air) of 600 °C or lower temperature is blown in through the lower tuyeres 6b to generate reducing gas by the reaction C + O 2 ⁇ 2CO, thereby reducing the melt raw materials X.
  • normal temperature air is blown in through the upper tuyeres 6a to secure the heat required for melting the melt raw materials X (by the exothermic reaction 2CO + O 2 ⁇ 2CO 2 ), thereby melting the melt raw materials X.
  • the deposition heights (stock levels) of the raw material inside and outside the right circular steel cylinder naturally fall. Therefore, in order to ensure stable raw material melting while sealing the upper furnace unit 3, the stock level is measured with a level meter (not shown) attached to the upper furnace unit 3, and the raw material charge timing is controlled to maintain the raw material deposition heights (stock levels) at predetermined levels.
  • the invention furnace achieves a highly orderly state of raw material deposition inside the furnace. Therefore, despite the use of a large amount of fine coke, it is nevertheless possible to dramatically enhance the reducing efficiency by reducing gas and the melting efficiency by reaction heat, thereby enabling efficient, stable operation over the long term, without lowering the combustion efficiency ⁇ CO of the solid fuel, while also avoiding charge hanging.
  • furnace operation operation was conducted under the raw material mixing conditions shown in Table 1 using iron sources and solid fuel (coke).
  • the vertical furnace shown in FIG. 1 was charged from the furnace top in the charging cycle of raw material A1 - A1 - A2.
  • the following were measured for the case of continuous operation over seven days: gas utilization rate ( ⁇ CO ) of exhausted furnace top gas, exhausted furnace top gas temperature (°C), furnace pressure (hPa), blast pressure (kPa), number of blast volume reductions, number of blast shutdowns, and productivity (T/H).
  • gas utilization rate ( ⁇ CO ) of exhausted furnace top gas exhausted furnace top gas temperature (°C), furnace pressure (hPa), blast pressure (kPa), number of blast volume reductions, number of blast shutdowns, and productivity (T/H).
  • operation was conducted in charge cycles each consisting of the three charges A1 - A1 - A2 to establish an average mixing ratio of iron sources shown in Table 1 of 70% high metallization rate iron source and 30% low metallization rate iron source.
  • a comparative example was conducted using a conventional vertical furnace continuously charged according to raw material mixing pattern B shown in Table 2, which was also charged in the vertical furnace shown in FIG. 1 , and, as in the invention example, the following were measured for the case of continuous operation over seven days: gas utilization rate ( ⁇ CO ) of exhausted furnace top gas, exhausted furnace top gas temperature (°C), furnace pressure (hPa), blast pressure (kPa), number of blast volume reductions, number of blast shutdowns, and productivity (T/H).
  • gas utilization rate ( ⁇ CO ) of exhausted furnace top gas exhausted furnace top gas temperature (°C), furnace pressure (hPa), blast pressure (kPa), number of blast volume reductions, number of blast shutdowns, and productivity (T/H).
  • ⁇ CO gas utilization rate
  • hPa furnace pressure
  • blast pressure kPa
  • productivity productivity
  • Table 1 Raw material condition High metallization rate iron source Low metallization rate iron source Solid fuel Shredder scraps Plate scraps (M:>99 mass%) (M:99 mass% Reduction iron (M:96 mass%) Dust pellets C:10 mass, M:2 mass%) Self-reducing agglomerates (C:15 mass M:5 mass%) Blast furnace coke Ratio of solid fuel to iron source (exclusive ratio) (mass%) Grain size (mm) Ash (mass%) Mixing ratio (mass%) A 50 20 0 30 0 50 13 100 25 Note: M is average metallization rate. C is carbon content.
  • Table 2 Raw material condition High metallization rate iron source Low metallization rate iron source Solid fuel Charging position Scrap (t/ch) Dust pellets (t/ch) Blast furnace coke (t/ch) A1 4.2 0.5 0.9 Center A2 2.6 0.8 Periphery B 2.8 1.2 0.87 Unseparated Table 3
  • Example type and number Raw material condition Superficial gas velocity (Nm/s) Furnace pressure (hPa) Gas utilization furnace rate of exhausted furnace gas ( ⁇ CO (%) Exhausted top gas temp.
  • the Invention Example was conducted using the invention charging unit for separate charging to differentiate the raw material mixing ratios between the center and peripheral regions so as to charge the center region with much scrap of large solid size not requiring reduction and the peripheral region with dust pellets of small solid size requiring reduction.
  • Table 3 in the case of the Invention Example, when the iron sources were melted using solid fuel constituted 100 mass% of blast furnace coke, it was possible to maintain the average furnace pressure at a stable operating level, minimize blast volume reductions and blast shutdowns necessitated by increased blast pressure, and maintain high productivity of molten iron throughout the operating period.
  • Comparative Examples 1 and 2 shown In Table 3 represent cases of operation in which the invention charging unit for separate charging was not used and the scrap and dust pellets were charged at a rate per charge equivalent to the average rate per cycle in Example 1.
  • the present invention provides a vertical furnace capable of conducting efficient, stable operation over the long term, without lowering the combustion efficiency ⁇ CO of solid fuel, while also avoiding charge hanging.
  • the applicability of the present invention in the iron and steel manufacturing industry is therefore considerable.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture Of Iron (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
EP08778301A 2007-09-07 2008-07-14 Four vertical Withdrawn EP2202323A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2007233197 2007-09-07
JP2008177041A JP4308878B2 (ja) 2007-09-07 2008-07-07 竪型炉
PCT/JP2008/063074 WO2009031367A1 (fr) 2007-09-07 2008-07-14 Four vertical

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Publication Number Publication Date
EP2202323A1 true EP2202323A1 (fr) 2010-06-30
EP2202323A4 EP2202323A4 (fr) 2010-09-15

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EP (1) EP2202323A4 (fr)
JP (1) JP4308878B2 (fr)
WO (1) WO2009031367A1 (fr)

Cited By (2)

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CN104697321A (zh) * 2015-02-15 2015-06-10 德清县众合保温材料厂（普通合伙） 冲天炉用布料机构
CN104792150A (zh) * 2015-04-27 2015-07-22 乔治费歇尔汽车产品(昆山)有限公司 一种天然气冲天炉

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Publication number Priority date Publication date Assignee Title
CN101813412B (zh) * 2010-04-30 2011-09-14 攀枝花市创盛粉末冶金有限责任公司 用于竖炉的防粘布料方法及装置
CN101832706B (zh) * 2010-04-30 2012-05-23 攀枝花市创盛粉末冶金有限责任公司 外燃管式直接还原竖炉

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