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WO2011162427A1 - Four présentant une distribution régulière de gaz - Google Patents

Four présentant une distribution régulière de gaz Download PDF

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Publication number
WO2011162427A1
WO2011162427A1 PCT/KR2010/004083 KR2010004083W WO2011162427A1 WO 2011162427 A1 WO2011162427 A1 WO 2011162427A1 KR 2010004083 W KR2010004083 W KR 2010004083W WO 2011162427 A1 WO2011162427 A1 WO 2011162427A1
Authority
WO
WIPO (PCT)
Prior art keywords
charge
reduction furnace
furnace
reducing gas
down pipe
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.)
Ceased
Application number
PCT/KR2010/004083
Other languages
English (en)
Korean (ko)
Inventor
강신명
이상호
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.)
Posco Engineering and Construction Co Ltd
Posco Holdings Inc
Original Assignee
Posco Co Ltd
Posco Engineering and Construction Co Ltd
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 Posco Co Ltd, Posco Engineering and Construction Co Ltd filed Critical Posco Co Ltd
Priority to EP10853710.1A priority Critical patent/EP2586877B1/fr
Priority to PCT/KR2010/004083 priority patent/WO2011162427A1/fr
Priority to CN2010800675952A priority patent/CN102947470A/zh
Publication of WO2011162427A1 publication Critical patent/WO2011162427A1/fr
Anticipated expiration legal-status Critical
Priority to ZA2013/00525A priority patent/ZA201300525B/en
Ceased legal-status Critical Current

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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
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in 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
    • C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
    • C21B13/143—Injection of partially reduced ore into a molten bath
    • 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
    • F27B1/005—Shaft or like vertical or substantially vertical furnaces wherein no smelting of the charge occurs, e.g. calcining or sintering furnaces
    • 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
    • F27D3/16—Introducing a fluid jet or current into the charge
    • 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
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature

Definitions

  • the present invention relates to a reduction furnace for reducing ore containing iron oxide components and an apparatus for melting molten reduced ore to produce molten iron.
  • FIG. 1 shows a reduction furnace for reducing ore containing iron oxide components and an apparatus 1 for melting molten reduced ore to produce molten iron.
  • the apparatus 1 includes a reducing furnace 10 for blowing or reducing a precipitated ore such as pellets or lumps.
  • the charge is introduced into the reduction furnace 10 through the charge inlet 11.
  • the charges reduced in the reduction furnace 10 are quantitatively discharged by the discharge screw 13, and the discharged charges are supplied to the melting furnace 20 through the vertical down pipe 14 and the inclined down pipe 16.
  • a drop box 15 is provided in the vertical down pipe 14, and a nitrogen supply pipe (not shown) is connected to the drop box 15 to blow cooling nitrogen into the vertical down pipe 14. By this cooling nitrogen, the heat shock applied to the discharge screw 13 by the gas flowing back from the melting furnace 20 to the reducing furnace 10 can be reduced.
  • coal is gasified to produce a reducing gas necessary for reducing the charges, and the charged charges reduced and supplied in the reduction furnace 10 are melted using the heat generated at this time.
  • the reducing gas generated in the melting furnace 20 is collected in the cyclone 22 and then blown into the reducing furnace 10 through the reducing gas inlet 17.
  • the reduced reducing gas passes through the charge filling layer 30 in the form of an oxide to reduce the charge.
  • the reduced reducing gas is not supplied to the center of the reduction furnace 10 due to the resistance by the charged charges, and mainly flows through the wall.
  • Non-uniform distribution of the reducing gas causes a severe imbalance in the reduction rate for each position of the charges in the reduction furnace 10, and breaks the thermal balance of the melting furnace 20 by supplying the unreduced charges in the center to the melting furnace 20, It causes problems such as reduced production, higher fuel costs and lower utilization.
  • the size of the conventional reduction furnace 10 is enlarged for the purpose of increasing the capacity, the non-uniform distribution of the reducing gas becomes more serious, and if it is desired to increase the radial size of the reduction furnace 10, It becomes more difficult.
  • the present invention is designed to solve the problems of the prior art, the reduction gas supplied into the reduction furnace in the reduction process is not supplied to the center of the reduction furnace mainly to remove the non-uniform distribution of the reducing gas flowing through the wall, reducing furnace
  • the reduction gas supplied into the reduction furnace in the reduction process is not supplied to the center of the reduction furnace mainly to remove the non-uniform distribution of the reducing gas flowing through the wall, reducing furnace
  • the present invention is to uniformly distribute the reducing gas in the radial direction of the reduction furnace, so that the capacity of the facility can be increased by simply increasing the radial direction of the reduction furnace and dead-man at the time of increasing the capacity of the reduction furnace. It aims to do it.
  • a charge inlet for charging the charge and a reducing gas inlet for blowing the reducing gas, the charge inlet is formed at the top,
  • the reducing gas inlet is provided in the reduction furnace, characterized in that installed in the bottom.
  • the reducing gas inlet is installed at the bottom of the existing Deadman located in the lower part of the reduction furnace.
  • a passage communicating with the reducing gas inlet is formed in the deadman.
  • a plurality of passages are formed symmetrically in the radial direction.
  • the vertical down pipe from which the charge reduced by the reducing gas is discharged is filled with the charge in the normal operating state.
  • a drop box is installed at an end of the vertical down pipe, and the drop box is provided with a discharge screw for quantitatively discharging the charge.
  • the vertical down pipe has a predetermined vertical length to produce a pressure loss of gas flowing back through the vertical down pipe to the reduction furnace.
  • the reducing gas is blown through the deadman disposed at the bottom center of the reduction furnace, the reduction rate of the charges in the reduction furnace is increased, the reduction rate between the charge particles is uniform, and when the charges are supplied to the melting furnace, This reduces the thermal burden on the plant, resulting in increased production, lower fuel costs, increased utilization and operational stability.
  • the present invention by uniformly distributing the reducing gas in the radial direction of the reduction furnace, it is possible to increase the capacity of the equipment simply by increasing the radial direction of the reduction furnace and deadman at the time of increasing the capacity of the reduction furnace.
  • FIG. 1 is a longitudinal cross-sectional view of a conventional apparatus for producing molten iron by melting a reduced ore and reduced ore containing iron oxide components.
  • FIG. 2 is a longitudinal sectional view of a reduction furnace according to an embodiment of the present invention.
  • FIG. 2 shows a longitudinal sectional view of a reduction furnace 100 according to an embodiment of the invention.
  • a charge inlet 110 and a plurality of exhaust gas outlets 120 are provided at an upper portion of the reduction furnace 100.
  • a dead-man 180 (or a dead- woman, or the same below) is installed at an inner lower end of the reduction furnace 100. Deadman 180 is installed to prevent the differentiation of the charge or the formation of a stagnation layer by the charge load.
  • a reducing gas inlet 170 is installed at the bottom of the dead man 180, and a passage is formed in the dead man 180 so that the reducing gas blown through the reducing gas inlet 170 may pass therethrough.
  • the reducing gas inlet 170 is formed at the radial center of the reduction furnace 100, and a plurality of passages in the dead man 180 communicating with the reducing gas inlet 170 are radially symmetrically formed. desirable.
  • a vertical down pipe 140 connected to the reduction furnace 100 is installed at the lower part of the reduction furnace 100, and a drop box 150 is installed at an end of the vertical down pipe 140.
  • the drop box 150 is equipped with a discharge screw 130 that is a removable charge quantity supply device.
  • the inclined down pipe 160 connected to the dome portion of the melting furnace is installed below the drop box 150.
  • the charge is introduced into the reduction furnace 100 through the charge inlet 110.
  • the charge reduced in the reduction furnace 100 is moved to the vertical down pipe 140, is discharged quantitatively by the discharge screw 130 formed at the end of the vertical down pipe 140.
  • the discharged charge is supplied to the melting furnace through the inclined down pipe 160.
  • the reducing gas is discharged through the exhaust gas outlet 120 after reducing the charge.
  • the interior of the reduction furnace 100 and the vertical down pipe 140 is filled with a charge.
  • reducing gas can pass through the bottom of the deadman 180 is already installed in the lower end of the reducing furnace.
  • a reducing gas inlet 170 to blow the reducing gas of the melting furnace, a uniform distribution in the radial direction is induced from a nonuniform distribution phenomenon of the conventional reducing gas, thereby increasing the reducing gas utilization rate and the reduction rate of the charged material and making the reducing rate uniform.
  • the thermal burden on the furnace is reduced to increase production, reduce fuel costs, increase operation rate, and increase operation stability.
  • the uniform distribution of the reducing gas in the radial direction is possible, the capacity of the facility can be increased simply by increasing the radial direction of the reduction furnace 100 and the deadman 180 at the time of increasing the capacity of the reduction furnace 100.
  • a discharge screw 130 which is a charge quantity supply device at the lower end of the reduction furnace, is installed in the drop box 150, a pressure loss is generated in the vertical down pipe 140, thereby reducing the high-pressure reducing gas in the melting furnace. Can be prevented from flowing back into the reduction furnace 100 through the discharge screw 130. That is, the high-pressure reducing gas in the melting furnace located below the inclined down pipe 160 is prevented from flowing back into the reduction furnace 100 due to the differential pressure of the vertical down pipe 140.
  • the vertical down pipe 140 is installed in order to prevent backflow of the reducing gas through the discharge screw 130. Since the pressure loss occurs, the height of the reduction furnace 100 may be reduced by the charge unreduced height h of FIG. 1.
  • the reduction furnace 100 in the prior art, although nitrogen was blown into the vertical down pipe 140 for the purpose of reducing the thermal shock applied to the discharge screw 130 by the gas flowing back from the melting furnace to the reduction furnace 100, the reduction furnace 100 according to the present invention. In the vertical down pipe 140 does not require nitrogen to be blown because the nitrogen consumption can be reduced and operating costs can be reduced.

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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)
  • Manufacture Of Iron (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

La présente invention concerne un four destiné à réduire un minerai contenant un élément oxyde de fer, comprenant un orifice d'entrée de charge (110) dans lequel une charge est insérée, et un orifice d'admission de gaz réduit (170) dans lequel est soufflé du gaz réduit, l'orifice d'entrée de charge (110) étant formé sur la partie supérieure, et l'orifice d'admission de gaz réduit (170) étant disposé au centre de la partie inférieure. Selon la présente invention, le gaz réduit peut être distribué régulièrement en étant soufflé dans le centre de la partie inférieure du four, ce qui permet d'augmenter le taux de réduction de la charge dans le four et d'obtenir un taux de réduction uniforme entre les particules de la charge.
PCT/KR2010/004083 2010-06-23 2010-06-23 Four présentant une distribution régulière de gaz Ceased WO2011162427A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP10853710.1A EP2586877B1 (fr) 2010-06-23 2010-06-23 Four présentant une distribution régulière de gaz
PCT/KR2010/004083 WO2011162427A1 (fr) 2010-06-23 2010-06-23 Four présentant une distribution régulière de gaz
CN2010800675952A CN102947470A (zh) 2010-06-23 2010-06-23 气体均匀分布的还原炉
ZA2013/00525A ZA201300525B (en) 2010-06-23 2013-01-21 Furnace having even distribution of gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2010/004083 WO2011162427A1 (fr) 2010-06-23 2010-06-23 Four présentant une distribution régulière de gaz

Publications (1)

Publication Number Publication Date
WO2011162427A1 true WO2011162427A1 (fr) 2011-12-29

Family

ID=45371587

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2010/004083 Ceased WO2011162427A1 (fr) 2010-06-23 2010-06-23 Four présentant une distribution régulière de gaz

Country Status (4)

Country Link
EP (1) EP2586877B1 (fr)
CN (1) CN102947470A (fr)
WO (1) WO2011162427A1 (fr)
ZA (1) ZA201300525B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111893233B (zh) * 2020-07-14 2022-05-13 钢研晟华科技股份有限公司 一种氢冶金竖炉系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032123A (en) * 1976-10-15 1977-06-28 Armco Steel Corporation Shaft furnace for direct reduction of ores
JPS5352206A (en) * 1976-10-05 1978-05-12 Ishikawajima Harima Heavy Ind Co Ltd Cutting off apparatus for reduced iron furnace
KR960001711B1 (ko) * 1987-07-13 1996-02-03 뵈스트-알핀 인두스트리 안라겐바우 게젤샤프트 엠.베.하. 용해가스발생로에 가스화 매체와 해면철을 장입하는 장치
KR100711777B1 (ko) * 2005-12-26 2007-04-25 주식회사 포스코 장입 방법을 개선한 용철제조방법 및 이를 이용한용철제조장치

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1458762A1 (de) * 1965-07-29 1969-03-13 Huettenwerk Oberhausen Ag Schachtofen fuer die Direktreduktion von Eisenerz
DE3422185A1 (de) * 1984-06-12 1985-12-12 Korf Engineering GmbH, 4000 Düsseldorf Anordnung aus einem vergaser und direktreduktionsofen
KR100470730B1 (ko) * 2001-02-12 2005-02-21 주식회사 자원리싸이클링 연구소 폐기물의 용융소각장치 및 이를 이용한 용융소각방법

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5352206A (en) * 1976-10-05 1978-05-12 Ishikawajima Harima Heavy Ind Co Ltd Cutting off apparatus for reduced iron furnace
US4032123A (en) * 1976-10-15 1977-06-28 Armco Steel Corporation Shaft furnace for direct reduction of ores
KR960001711B1 (ko) * 1987-07-13 1996-02-03 뵈스트-알핀 인두스트리 안라겐바우 게젤샤프트 엠.베.하. 용해가스발생로에 가스화 매체와 해면철을 장입하는 장치
KR100711777B1 (ko) * 2005-12-26 2007-04-25 주식회사 포스코 장입 방법을 개선한 용철제조방법 및 이를 이용한용철제조장치

Also Published As

Publication number Publication date
EP2586877B1 (fr) 2018-08-29
EP2586877A1 (fr) 2013-05-01
ZA201300525B (en) 2013-09-25
CN102947470A (zh) 2013-02-27
EP2586877A4 (fr) 2016-11-09

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