EP2586877A1 - Furnace having even distribution of gas - Google Patents

Furnace having even distribution of gas Download PDF

Info

Publication number
EP2586877A1
EP2586877A1 EP10853710.1A EP10853710A EP2586877A1 EP 2586877 A1 EP2586877 A1 EP 2586877A1 EP 10853710 A EP10853710 A EP 10853710A EP 2586877 A1 EP2586877 A1 EP 2586877A1
Authority
EP
European Patent Office
Prior art keywords
reduction furnace
reducing gas
charge material
down pipe
furnace
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.)
Granted
Application number
EP10853710.1A
Other languages
German (de)
French (fr)
Other versions
EP2586877A4 (en
EP2586877B1 (en
Inventor
Sin-Myoung Kang
Sang-Ho Lee
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
Publication of EP2586877A1 publication Critical patent/EP2586877A1/en
Publication of EP2586877A4 publication Critical patent/EP2586877A4/en
Application granted granted Critical
Publication of EP2586877B1 publication Critical patent/EP2586877B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B13/00Making spongy iron or liquid steel, by direct processes
    • C21B13/02Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B13/00Making spongy iron or liquid steel, by direct processes
    • C21B13/14Multi-stage processes processes carried out in different vessels or furnaces
    • C21B13/143Injection of partially reduced ore into a molten bath
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00Shaft or like vertical or substantially vertical furnaces
    • F27B1/005Shaft or like vertical or substantially vertical furnaces wherein no smelting of the charge occurs, e.g. calcining or sintering furnaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00Charging; Discharging; Manipulation of charge
    • F27D3/16Introducing a fluid jet or current into the charge
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00Forming, maintaining, or circulating atmospheres in heating chambers
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B2100/00Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44Removing particles, e.g. by scrubbing, dedusting
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B2100/00Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/60Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/64Controlling the physical properties of the gas, e.g. pressure or temperature

Definitions

  • the present invention relates to a reduction furnace reducing ore containing an iron oxide component and an apparatus for manufacturing molten iron by melting reduced ore.
  • FIG. 1 illustrates a typical reduction furnace reducing ore containing an iron oxide component and an apparatus 1 for manufacturing molten iron by melting reduced ore.
  • the apparatus 1 includes a reduction furnace 10 for reducing or preheating agglomerated ores, such as pellets or lump ore, by injecting a reducing gas.
  • a charge material is introduced into the reduction furnace 10 through a charge feeding port 11.
  • the charge material reduced in the reduction furnace 10 is discharged in a fixed amount by a discharge screw 13 and the discharged charge material is supplied to a melting furnace 20 through a vertical down pipe 14 and a tilt down pipe 16.
  • a drop box 15 is included in the vertical down pipe 14 and a nitrogen supply pipe (not shown) is connected to the drop box 15 to inject nitrogen for cooling into the vertical down pipe 14.
  • the nitrogen for cooling may decrease thermal shock applied to the discharge screw 13 by gas flowing backwards to the reduction furnace 10 from the melting furnace 20.
  • reducing gas required for the reduction of the charge material is prepared by the gasification of coal and heat generated at this time is also used to melt the charge material reduced and supplied from the reduction furnace 10.
  • the reducing gas generated in the melting furnace 20 is dust collected in a cyclone 22 and is then injected into the reduction furnace 10 through a reducing gas intake port 17.
  • the injected reducing gas reduces the charge material while passing through a packed bed 30 of the charge material in an oxide form.
  • the injected reducing gas may not be provided to the center of the reduction furnace 10 due to the resistance caused by the packed charge material and may mainly flow along a wall portion thereof.
  • the non-uniform distribution of the reducing gas may cause severe unbalance of a reduction rate for each position of the charge material and the unreduced charge material at the center of the reduction furnace 10 may be provided to the melting furnace 20 to break thermal balance of the melting furnace 20, and thus, limitations, such as a decrease in production, an increase in fuel cost, and a decrease in an operating ratio, may occur.
  • limitations such as a decrease in production, an increase in fuel cost, and a decrease in an operating ratio, may occur.
  • the non-uniform distribution of the reducing gas may be more severe and it may be more difficult for the reducing gas to reach the center thereof when the size of the reduction furnace 10 radial direction is increased in a radial direction.
  • An aspect of the present invention provides improvements, such as an increase in production, a decrease in fuel costs, an increase in an operating ratio, and operational stability, by decreasing a thermal load of a melting furnace when a charge material is supplied thereto by removing a non-uniform distribution phenomenon of reducing gas, in which the reducing gas supplied to the inside of a reduction furnace in a reduction process is mainly flowing along a wall portion but not introducing to the center of the reduction furnace thereof, to increase a reduction rate of the charge material and uniformize reduction rates between particles of the charge material.
  • Another aspect of the present invention provides an increase in the capacity of a facility, able to be achieved by simply increasing the size of a reduction furnace and a deadman in a radial direction during the increase in the capacity of the reduction furnace by allowing the reducing gas to be uniformly distributed in the radial direction of the reduction furnace.
  • a reduction furnace including: a charge feeding port having a charge material introduced therethrough; and a reducing gas intake port having reducing gas injected therethrough, wherein the charge feeding port is formed in an upper portion thereof and the reducing gas intake port is installed in a bottom portion thereof.
  • the reducing gas intake port may be installed in a bottom portion of a deadman disposed in a lower portion of the reduction furnace.
  • a path connected to the reducing gas intake port may be formed inside the deadman.
  • the path may be formed in plural to be symmetrical in a radial direction.
  • a vertical down pipe having the charge material reduced by the reducing gas discharged therethrough may be filled with the charge material in normal operating conditions.
  • a drop box may be installed in an end portion of the vertical down pipe and a discharge screw discharging a fixed amount of the charge material may be installed in the drop box.
  • the vertical down pipe has a predetermined vertical length to generate a reduction in pressure in gas flowing backwards into the reduction furnace through the vertical down pipe.
  • reducing gas may be injected through a deadman disposed at the center of a bottom portion of a reduction furnace, a reduction rate of a charge material in the reduction furnace may increase, reduction rates between particles of the charge material may be uniformized, and a thermal load of a melting furnace may be decreased during the charge material is supplied to the melting furnace, and thus, an increase in production, a decrease in fuel costs, an increase in an operating ratio, and operational stability may be achieved.
  • the reducing gas may be allowed to be uniformly distributed in a radial direction of the reduction furnace, and thus, an increase in the capacity of a facility may be achieved by simply increasing the size of the reduction furnace and the deadman in the radial direction thereof during the increase in the capacity of the reduction furnace.
  • a discharge screw since the position of a discharge screw, a charge material supply device, may be changed from a lower end of the reduction furnace to a portion of a drop box, differential pressure in a vertical down pipe may be generated, and thus, a back flow of high-pressure gas from the melting furnace into the reduction furnace may be prevented.
  • FIG. 1 is a longitudinal sectional view illustrating a typical reduction furnace reducing ore containing an iron oxide component and an apparatus for manufacturing molten iron by melting reduced ore;
  • FIG. 2 is a longitudinal sectional view illustrating a reduction furnace according to an embodiment of the present invention.
  • FIG. 2 is a longitudinal sectional view illustrating a reduction furnace 100 according to an embodiment of the present invention.
  • a charge feeding port 110 and a plurality of exhaust gas discharge ports 120 are included in an upper portion of the reduction furnace 110.
  • a deadman 180 (or a dead woman, hereinafter, both terms are used interchangeably) is installed in a lower end of the inside of the reduction furnace 100. The deadman 180 is installed to prevent the degradation of the charge material due to the accumulative load of the charge material itself or formation of a stationary bed.
  • a reducing gas intake port 170 is installed in a bottom portion of the deadman 180 and a path is formed inside the deadman 180 so as to allow the reducing gas injected through the reducing gas intake port 170 to pass therethrough.
  • the reducing gas intake port 170 is formed in the center of the reduction furnace 100 in a radial direction, and the path inside the deadman 180 connected to the reducing gas intake port 170 may be formed in plural to be symmetrical in the radial direction.
  • a vertical down pipe 140 connected to the reduction furnace 100 is installed in a lower portion of the reduction furnace 100 and a drop box 150 is installed in an end portion of the vertical down pipe 140.
  • a discharge screw 130, an attachable and detachable device for supplying a fixed amount of the charge material, is installed in the drop box 150.
  • a tilt down pipe 160 connected to a dome portion of a melting furnace is installed in a lower portion of the drop box 150.
  • the charge material is introduced into the reduction furnace 100 through the charge feeding port 110.
  • the charge material reduced in the reduction furnace 100 is transferred to the vertical down pipe 140 to be discharged by the discharge screw 130 formed in the end portion of the vertical down pipe 140 in a fixed amount.
  • the discharged charge material is supplied to the melting furnace through the tilt down pipe 160. Meanwhile, reducing gas reduces the charge material and is then discharged through the exhaust gas discharge ports 120.
  • Inner portions of the reduction furnace 100 and the vertical down pipe 140 are filled with the charge material in normal operating conditions.
  • reducing gas from the melting furnace is allowed to be injected thereinto by the installation of the reducing gas intake port 170 having the reducing gas passed therethrough in the bottom portion of the deadman 180 installed at the lower end of the inside of the reduction furnace, instead of a typical reducing gas intake port disposed on an intermediate wall portion of the reduction furnace, and thus, uniform distribution in the radial direction may be induced from a typical non-uniform distribution phenomenon of the reducing gas, a reducing gas utilization ratio and a reduction rate of the charge material may be increased, and the reduction rate thereof may be uniformized.
  • an increase in production, a decrease in fuel costs, an increase in an operating ratio, and an increase in operational stability may be achieved by reducing a thermal load of the melting furnace when the charge material is provided to the melting furnace.
  • the reducing gas may be uniformly distributed in the radial direction of the reduction furnace, an increase in the capacity of facility may be achieved by simply increasing the reduction furnace 100 and the deadman 180 in the radial direction thereof during the increase in the capacity of the reduction furnace 100.
  • the discharge screw 130 a device for supplying a fixed amount of the charge material, is installed in a portion of the drop box 150 instead of the lower end of the reduction furnace, a reduction in pressure in the vertical down pipe 140 is generated, and thus, a back flow of high-pressure reducing gas in the melting furnace into the reduction furnace 100 through the discharge screw 130 may be prevented. That is, the back flow of high-pressure reducing gas in the melting furnace disposed at a lower portion of the tilt down pipe 160 into the reduction furnace 100 due to the generation of differential pressure in the vertical down pipe 140 may be prevented.
  • an unreduced height h of the charge material is essential for the purpose of generating a reduction in pressure in the reducing gas in order to prevent the back flow of the reducing gas through the discharge screw 130.
  • the height of the reduction furnace 100 may be reduced by as much as the unreduced height h of the charge material illustrated in FIG. 1 .
  • nitrogen is typically injected into the vertical down pipe 140 for the purpose of reducing thermal shock applied to the discharge screw 130 by gas flowing backwards from the melting furnace into the reduction furnace 100.
  • nitrogen injected into the vertical down pipe 140 may not be required in the reduction furnace 100 according to the present invention, the amount of nitrogen used may be reduced and operational costs may be reduced.

Landscapes

  • 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

Provided is a reduction furnace reducing ore containing an iron oxide component, and including a charge feeding port 110 having a charge material introduced therethrough and a reducing gas intake port 170 having reducing gas injected therethrough, wherein the charge feeding port 110 is formed in an upper portion thereof and the reducing gas intake port 170 is installed in a bottom portion thereof.
According to the present invention, since the reducing gas may be injected into the center of a lower portion of the reduction furnace, the reducing gas may be allowed to be uniformly distributed in the reduction furnace, and thus, a reduction rate of the charge material may be increased and reduction rates between particles of the charge material may be uniformized.

Description

    [Technical Field]
  • The present invention relates to a reduction furnace reducing ore containing an iron oxide component and an apparatus for manufacturing molten iron by melting reduced ore.
  • [Background Art]
  • FIG. 1 illustrates a typical reduction furnace reducing ore containing an iron oxide component and an apparatus 1 for manufacturing molten iron by melting reduced ore. As illustrated in FIG. 1, the apparatus 1 includes a reduction furnace 10 for reducing or preheating agglomerated ores, such as pellets or lump ore, by injecting a reducing gas. A charge material is introduced into the reduction furnace 10 through a charge feeding port 11. The charge material reduced in the reduction furnace 10 is discharged in a fixed amount by a discharge screw 13 and the discharged charge material is supplied to a melting furnace 20 through a vertical down pipe 14 and a tilt down pipe 16. A drop box 15 is included in the vertical down pipe 14 and a nitrogen supply pipe (not shown) is connected to the drop box 15 to inject nitrogen for cooling into the vertical down pipe 14. The nitrogen for cooling may decrease thermal shock applied to the discharge screw 13 by gas flowing backwards to the reduction furnace 10 from the melting furnace 20.
  • In the melting furnace 20, reducing gas required for the reduction of the charge material is prepared by the gasification of coal and heat generated at this time is also used to melt the charge material reduced and supplied from the reduction furnace 10.
  • The reducing gas generated in the melting furnace 20 is dust collected in a cyclone 22 and is then injected into the reduction furnace 10 through a reducing gas intake port 17. The injected reducing gas reduces the charge material while passing through a packed bed 30 of the charge material in an oxide form. The injected reducing gas may not be provided to the center of the reduction furnace 10 due to the resistance caused by the packed charge material and may mainly flow along a wall portion thereof. The non-uniform distribution of the reducing gas may cause severe unbalance of a reduction rate for each position of the charge material and the unreduced charge material at the center of the reduction furnace 10 may be provided to the melting furnace 20 to break thermal balance of the melting furnace 20, and thus, limitations, such as a decrease in production, an increase in fuel cost, and a decrease in an operating ratio, may occur. In particular, in the case that a size of the typical reduction furnace 10 is increased for the purpose of increasing the capacity thereof, the non-uniform distribution of the reducing gas may be more severe and it may be more difficult for the reducing gas to reach the center thereof when the size of the reduction furnace 10 radial direction is increased in a radial direction.
  • Also, since pressure drop in the cyclone 22 may occur in the case that the reducing gas generated in the melting furnace 20 is injected into the reduction furnace 10 through the cyclone 22, the reducing gas may flow backwards into the reduction furnace 10 through the vertical down pipe 14 and the discharge screw 13 having a relatively small pressure loss. Therefore, in order to prevent this, installation of an unreduced height h of the charge material is essentially required for the purpose of generating a reduction in pressure in the reducing gas flowing backwards into the reduction furnace 10 through the discharge screw 13 and, as a result, the height of a facility must be unnecessarily increased.
  • [Disclosure] [Technical Problem]
  • An aspect of the present invention provides improvements, such as an increase in production, a decrease in fuel costs, an increase in an operating ratio, and operational stability, by decreasing a thermal load of a melting furnace when a charge material is supplied thereto by removing a non-uniform distribution phenomenon of reducing gas, in which the reducing gas supplied to the inside of a reduction furnace in a reduction process is mainly flowing along a wall portion but not introducing to the center of the reduction furnace thereof, to increase a reduction rate of the charge material and uniformize reduction rates between particles of the charge material.
  • Another aspect of the present invention provides an increase in the capacity of a facility, able to be achieved by simply increasing the size of a reduction furnace and a deadman in a radial direction during the increase in the capacity of the reduction furnace by allowing the reducing gas to be uniformly distributed in the radial direction of the reduction furnace.
  • [Technical Solution]
  • According to an aspect of the present invention, there is provided a reduction furnace including: a charge feeding port having a charge material introduced therethrough; and a reducing gas intake port having reducing gas injected therethrough, wherein the charge feeding port is formed in an upper portion thereof and the reducing gas intake port is installed in a bottom portion thereof.
  • The reducing gas intake port may be installed in a bottom portion of a deadman disposed in a lower portion of the reduction furnace.
  • A path connected to the reducing gas intake port may be formed inside the deadman.
  • The path may be formed in plural to be symmetrical in a radial direction.
  • A vertical down pipe having the charge material reduced by the reducing gas discharged therethrough may be filled with the charge material in normal operating conditions.
  • A drop box may be installed in an end portion of the vertical down pipe and a discharge screw discharging a fixed amount of the charge material may be installed in the drop box.
  • The vertical down pipe has a predetermined vertical length to generate a reduction in pressure in gas flowing backwards into the reduction furnace through the vertical down pipe.
  • [Advantageous Effects]
  • According to the present invention, since reducing gas may be injected through a deadman disposed at the center of a bottom portion of a reduction furnace, a reduction rate of a charge material in the reduction furnace may increase, reduction rates between particles of the charge material may be uniformized, and a thermal load of a melting furnace may be decreased during the charge material is supplied to the melting furnace, and thus, an increase in production, a decrease in fuel costs, an increase in an operating ratio, and operational stability may be achieved.
  • Also, in the present invention, the reducing gas may be allowed to be uniformly distributed in a radial direction of the reduction furnace, and thus, an increase in the capacity of a facility may be achieved by simply increasing the size of the reduction furnace and the deadman in the radial direction thereof during the increase in the capacity of the reduction furnace.
  • Also, since the position of a discharge screw, a charge material supply device, may be changed from a lower end of the reduction furnace to a portion of a drop box, differential pressure in a vertical down pipe may be generated, and thus, a back flow of high-pressure gas from the melting furnace into the reduction furnace may be prevented.
  • [Description of Drawings]
  • The above and other aspects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
  • FIG. 1 is a longitudinal sectional view illustrating a typical reduction furnace reducing ore containing an iron oxide component and an apparatus for manufacturing molten iron by melting reduced ore; and
  • FIG. 2 is a longitudinal sectional view illustrating a reduction furnace according to an embodiment of the present invention.
  • [Best Mode]
  • Hereinafter, an embodiment of the present invention is described in detail with reference to the accompanying drawings.
  • FIG. 2 is a longitudinal sectional view illustrating a reduction furnace 100 according to an embodiment of the present invention. Referring to FIG. 2, a charge feeding port 110 and a plurality of exhaust gas discharge ports 120 are included in an upper portion of the reduction furnace 110. A deadman 180 (or a deadwoman, hereinafter, both terms are used interchangeably) is installed in a lower end of the inside of the reduction furnace 100. The deadman 180 is installed to prevent the degradation of the charge material due to the accumulative load of the charge material itself or formation of a stationary bed. A reducing gas intake port 170 is installed in a bottom portion of the deadman 180 and a path is formed inside the deadman 180 so as to allow the reducing gas injected through the reducing gas intake port 170 to pass therethrough. The reducing gas intake port 170 is formed in the center of the reduction furnace 100 in a radial direction, and the path inside the deadman 180 connected to the reducing gas intake port 170 may be formed in plural to be symmetrical in the radial direction.
  • A vertical down pipe 140 connected to the reduction furnace 100 is installed in a lower portion of the reduction furnace 100 and a drop box 150 is installed in an end portion of the vertical down pipe 140. A discharge screw 130, an attachable and detachable device for supplying a fixed amount of the charge material, is installed in the drop box 150. A tilt down pipe 160 connected to a dome portion of a melting furnace is installed in a lower portion of the drop box 150.
  • The charge material is introduced into the reduction furnace 100 through the charge feeding port 110. The charge material reduced in the reduction furnace 100 is transferred to the vertical down pipe 140 to be discharged by the discharge screw 130 formed in the end portion of the vertical down pipe 140 in a fixed amount. The discharged charge material is supplied to the melting furnace through the tilt down pipe 160. Meanwhile, reducing gas reduces the charge material and is then discharged through the exhaust gas discharge ports 120.
  • Inner portions of the reduction furnace 100 and the vertical down pipe 140 are filled with the charge material in normal operating conditions.
  • According to the configuration of the foregoing reduction furnace 100, reducing gas from the melting furnace is allowed to be injected thereinto by the installation of the reducing gas intake port 170 having the reducing gas passed therethrough in the bottom portion of the deadman 180 installed at the lower end of the inside of the reduction furnace, instead of a typical reducing gas intake port disposed on an intermediate wall portion of the reduction furnace, and thus, uniform distribution in the radial direction may be induced from a typical non-uniform distribution phenomenon of the reducing gas, a reducing gas utilization ratio and a reduction rate of the charge material may be increased, and the reduction rate thereof may be uniformized. Also, an increase in production, a decrease in fuel costs, an increase in an operating ratio, and an increase in operational stability may be achieved by reducing a thermal load of the melting furnace when the charge material is provided to the melting furnace. Further, since the reducing gas may be uniformly distributed in the radial direction of the reduction furnace, an increase in the capacity of facility may be achieved by simply increasing the reduction furnace 100 and the deadman 180 in the radial direction thereof during the increase in the capacity of the reduction furnace 100.
  • Also, since the discharge screw 130, a device for supplying a fixed amount of the charge material, is installed in a portion of the drop box 150 instead of the lower end of the reduction furnace, a reduction in pressure in the vertical down pipe 140 is generated, and thus, a back flow of high-pressure reducing gas in the melting furnace into the reduction furnace 100 through the discharge screw 130 may be prevented. That is, the back flow of high-pressure reducing gas in the melting furnace disposed at a lower portion of the tilt down pipe 160 into the reduction furnace 100 due to the generation of differential pressure in the vertical down pipe 140 may be prevented. Typically, installation of an unreduced height h of the charge material is essential for the purpose of generating a reduction in pressure in the reducing gas in order to prevent the back flow of the reducing gas through the discharge screw 130. However, since the pressure loss may be generated through the vertical down pipe 140 in the present invention, the height of the reduction furnace 100 may be reduced by as much as the unreduced height h of the charge material illustrated in FIG. 1.
  • Further, nitrogen is typically injected into the vertical down pipe 140 for the purpose of reducing thermal shock applied to the discharge screw 130 by gas flowing backwards from the melting furnace into the reduction furnace 100. However, since nitrogen injected into the vertical down pipe 140 may not be required in the reduction furnace 100 according to the present invention, the amount of nitrogen used may be reduced and operational costs may be reduced.
  • While the present invention has been shown and described in connection with the exemplary embodiments, it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

  1. A reduction furnace comprising:
    a charge feeding port 110 having a charge material introduced therethrough; and
    a reducing gas intake port 170 having reducing gas injected therethrough,
    wherein the charge feeding port 110 is formed in an upper portion thereof and the reducing gas intake port 170 is installed in a bottom portion thereof.
  2. The reduction furnace of claim 1, further comprising a deadman 180 disposed in a lower portion thereof,
    wherein the reducing gas intake port 170 is installed in a bottom portion of the deadman 180.
  3. The reduction furnace of claim 2, a path connected to the reducing gas intake port 170 is formed inside the deadman 180.
  4. The reduction furnace of claim 3, the path is formed in plural to be symmetrical in a radial direction.
  5. The reduction furnace of any one of claims 1 to 4, further comprising a vertical down pipe 140 having the charge material reduced by the reducing gas discharged therethrough,
    wherein inside of the vertical down pipe 140 is filled with the charge material in normal operating conditions.
  6. The reduction furnace of claim 5, wherein a drop box 150 is installed in an end portion of the vertical down pipe 140 and a discharge screw 130 discharging a fixed amount of the charge material is installed in the drop box 150.
  7. The reduction furnace of claim 6, wherein the vertical down pipe 140 has a predetermined vertical length to generate pressure drop in gas flowing backward into the reduction furnace through the vertical down pipe 140.
EP10853710.1A 2010-06-23 2010-06-23 Furnace having even distribution of gas Not-in-force EP2586877B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2010/004083 WO2011162427A1 (en) 2010-06-23 2010-06-23 Furnace having even distribution of gas

Publications (3)

Publication Number Publication Date
EP2586877A1 true EP2586877A1 (en) 2013-05-01
EP2586877A4 EP2586877A4 (en) 2016-11-09
EP2586877B1 EP2586877B1 (en) 2018-08-29

Family

ID=45371587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10853710.1A Not-in-force EP2586877B1 (en) 2010-06-23 2010-06-23 Furnace having even distribution of gas

Country Status (4)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111893233B (en) * 2020-07-14 2022-05-13 钢研晟华科技股份有限公司 Hydrogen metallurgy shaft furnace system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1458762A1 (en) * 1965-07-29 1969-03-13 Huettenwerk Oberhausen Ag Shaft furnace for the direct reduction of iron ore
JPS5848832B2 (en) * 1976-10-05 1983-10-31 石川島播磨重工業株式会社 Cutting device for reduced iron furnace
US4032123A (en) * 1976-10-15 1977-06-28 Armco Steel Corporation Shaft furnace for direct reduction of ores
DE3422185A1 (en) * 1984-06-12 1985-12-12 Korf Engineering GmbH, 4000 Düsseldorf ARRANGEMENT FROM A CARBURETTOR AND DIRECT REDUCTION STOVE
DE3723137C1 (en) * 1987-07-13 1989-03-16 Voest Alpine Ind Anlagen Device for feeding a melter gasifier with gasifying agents and sponge iron
KR100470730B1 (en) * 2001-02-12 2005-02-21 주식회사 자원리싸이클링 연구소 Smelting Incineration Apparatus and Method of Solid Waste Treatment
KR100711777B1 (en) * 2005-12-26 2007-04-25 주식회사 포스코 Method for manufacturing molten irons improving charging method and apparatus for manufacturing molten irons using the same

Also Published As

Publication number Publication date
ZA201300525B (en) 2013-09-25
EP2586877A4 (en) 2016-11-09
EP2586877B1 (en) 2018-08-29
CN102947470A (en) 2013-02-27
WO2011162427A1 (en) 2011-12-29

Similar Documents

Publication Publication Date Title
JP5696814B2 (en) Raw material charging method for bell-less blast furnace
US8052921B2 (en) Apparatus for manufacturing molten irons
EP2641981B1 (en) Method for manufacturing molten iron
RU2398886C2 (en) Installation for production of melt iron
KR101036640B1 (en) An apparatus for manufacturing compacted irons of reduced materials comprising fine direct reduced irons and an apparatus for manufacturing molten irons using the same
EP2586877B1 (en) Furnace having even distribution of gas
KR20200093038A (en) Filling system especially for shaft melt reduction furnaces
JP5364723B2 (en) Reduction furnace and pig iron manufacturing apparatus including the same
JP2010531389A (en) Method and apparatus for producing sponge iron
JP2008056985A (en) Method for operating blast furnace
JP4894949B2 (en) Blast furnace operation method
KR101191969B1 (en) Control device and control method for reduction gas of pig iron manufacturing equipment
JP6198649B2 (en) Raw material charging method for blast furnace
KR101060820B1 (en) Reduction furnace with uniform gas flow distribution
KR101798626B1 (en) Apparatus for ejection hci and this method
JP5862514B2 (en) Scrap melting vertical furnace operation method
JP6041073B1 (en) Raw material charging method to blast furnace
JP5966608B2 (en) Raw material charging method to blast furnace
KR20170013126A (en) Apparatus for injection the pulverized coal of melting furnace and this method
JPH05156329A (en) Method for operating powder injection from tuyere in blast furnace
JP4052047B2 (en) Raw material charging method to blast furnace
CN104704131A (en) Reducing gas blowing apparatus for fluidized reduction furnace
KR101557136B1 (en) Device for transferring powder of apparatus for manufacturing molten iron
JPS58171516A (en) Transferring apparatus of preliminarily reduced powdery and particulate ore in melt reduction equipment
JP2012102406A (en) Hopper

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20130110

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
RA4 Supplementary search report drawn up and despatched (corrected)

Effective date: 20161007

RIC1 Information provided on ipc code assigned before grant

Ipc: F27D 3/16 20060101ALI20160930BHEP

Ipc: F27B 1/00 20060101ALI20160930BHEP

Ipc: F27D 7/00 20060101ALI20160930BHEP

Ipc: C21B 13/02 20060101AFI20160930BHEP

Ipc: C21B 13/14 20060101ALI20160930BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20180319

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: POSCO

Owner name: POSCO ENGINEERING & CONSTRUCTION CO., LTD.

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1035198

Country of ref document: AT

Kind code of ref document: T

Effective date: 20180915

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602010053217

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20180829

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20181229

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20181129

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20181129

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20181130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602010053217

Country of ref document: DE

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

REG Reference to a national code

Ref country code: AT

Ref legal event code: UEP

Ref document number: 1035198

Country of ref document: AT

Kind code of ref document: T

Effective date: 20180829

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20190520

Year of fee payment: 10

26N No opposition filed

Effective date: 20190531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20190520

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20190623

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20190630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190623

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190623

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190623

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190630

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190630

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20181229

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190630

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602010053217

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 1035198

Country of ref document: AT

Kind code of ref document: T

Effective date: 20200623

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200623

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20100623

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180829