EP3889532B1 - Fluidized bed furnace - Google Patents

Fluidized bed furnace Download PDF

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Publication number
EP3889532B1
EP3889532B1 EP19889794.4A EP19889794A EP3889532B1 EP 3889532 B1 EP3889532 B1 EP 3889532B1 EP 19889794 A EP19889794 A EP 19889794A EP 3889532 B1 EP3889532 B1 EP 3889532B1
Authority
EP
European Patent Office
Prior art keywords
fluidized bed
space
reactor
bed space
fine
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.)
Active
Application number
EP19889794.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3889532A1 (en
EP3889532A4 (en
Inventor
Chang Kuk Ko
Myoung Kyun Shin
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 Holdings Inc
Original Assignee
Posco 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 filed Critical Posco Co Ltd
Publication of EP3889532A1 publication Critical patent/EP3889532A1/en
Publication of EP3889532A4 publication Critical patent/EP3889532A4/en
Application granted granted Critical
Publication of EP3889532B1 publication Critical patent/EP3889532B1/en
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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
    • F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
    • F27B15/003—Cyclones or chain of cyclones
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
    • 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
    • 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
    • F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
    • F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
    • F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B15/08—Arrangements of devices for charging
    • 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
    • F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
    • F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B15/09—Arrangements of devices for discharging
    • 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
    • F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
    • F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B15/10—Arrangements of air or gas supply devices

Definitions

  • the present disclosure relates to a fluidized bed furnace.
  • melt reduction iron manufacturing facility that produces molten iron by using fine iron ore directly, it includes a plurality of fluidized bed furnaces for fluidized reduction treatment of fine iron ore.
  • the fluidized bed furnace reduces fine iron ore in powder form to fine reduced iron by using high temperature reducing gas supplied from a melting gas furnace.
  • a conventional fluidized bed furnace used fine iron ore with a particle size of substantially less than 8 mm, but recently, the use of ultra-fine iron ore iron with a smaller particle size is required.
  • An embodiment provides a fluidized bed furnace that can minimize scattering loss while minimizing fusion problems even though fine iron ores are charged.
  • a fluidized bed furnace that can use 100 % of ultra-fine iron ore as a raw material can be provided.
  • One aspect of the present invention is to provide a fluidized bed furnace that includes: a lower reactor that forms a first fluidized bed space having a first diameter, and includes a discharge port through which fine reduced iron is discharged; an upper reactor that forms a second fluidized bed space having a second diameter that is greater than the first diameter, and includes a charging port through which fine iron ore is charged; and a tapered portion that forms a connection space that allows communication between the first fluidized bed space and the second fluidized bed space, and directly connects the lower reactor and the upper reactor.
  • the second diameter is 3 to 4 times the first diameter.
  • An outer wall of the tapered portion may have an angle of 45 degrees to 75 degrees with a second diameter D2 direction.
  • the charging port may be higher than half the height of an outer wall of the upper reactor.
  • the fluidized bed furnace includes a porous plate that is disposed between the second fluidized bed space and the connection space, and includes a plurality of through-holes.
  • the fluidized bed furnace includes a stand pipe that extends from the second fluidized bed space through the porous plate to the first fluidized bed space, and is supported by the porous plate.
  • the fluidized bed furnace may further include a plurality of nitrogen purge supply pipes disposed along a circumferential direction of an outer wall of the upper reactor.
  • the fluidized bed furnace includes a dispersion plate through which reduced gas supplied to the first fluidized bed space passes.
  • a fluidized bed furnace that can minimize scattering loss while minimizing fusion problems even though fine iron ores are charged can be provided.
  • a fluidized bed furnace that can use 100 % of ultra-fine iron ore as a raw material can be provided.
  • a fluidized bed furnace may be included in a melt reduction iron-manufacturing facility, but is not limited thereto.
  • the melt reduction iron-manufacturing facility may include at least one fluidized bed furnace for reducing fine iron ore to fine reduced iron, a compacting device for producing compacted material by pressing fine reduced iron, and a molten gas furnace, but are not limited thereto, and may further include various configurations.
  • Fine reduced iron is charged into fluidized bed furnaces, and fine reduced iron reduced from the fluidized bed furnaces can be made into molten iron by being manufactured as compacted material in a compacting device and supplied to a melting gas furnace with coal briquettes.
  • the reducing gas generated from the molten gas furnace can be supplied to fluidized bed furnaces.
  • FIG. 1 is a perspective view of a fluidized bed furnace according to a first embodiment.
  • a fluidized bed furnace 1000 includes a lower reactor 100, an upper reactor 200, a tapered portion 300, and a plurality of nitrogen purge supply pipes 400.
  • the lower reactor 100 has a circular cylinder shape, and forms a first fluidized bed space FS1 with a first diameter D1 as a flat area.
  • a turbulent fluidized bed (or fast fluidized bed) is formed such that vigorous gas solid mixing may occur.
  • the lower reactor 100 includes a discharge port 110 through which fine reduced iron is discharged.
  • the fine reduced iron reduced from the fine reduced iron in the first fluidized bed space FS1 of the lower reactor 100 is discharged through the discharge port 110.
  • the lower reactor 100 includes a lower reactor 120 that passes reducing gas RG supplied to the first fluidized bed space FS1.
  • the lower reactor 100 includes a dispersion plate 120 for passing the reducing gas RG supplied to the first fluidized bed space FS1.
  • the dispersion plate 120 includes a plurality of through-holes through which the reducing gas RG passes.
  • Reduced gas RG is supplied from a lower portion of the dispersion plate 120, and the reduced gas RG passes through the first fluidized bed space FS1 of the lower reactor 100 and the second fluidized bed space FS2 of the upper reactor 200, and is discharged to the upper portion of the upper reactor 200.
  • the reduced gas RG can be generated from the molten gas furnace of the melt reduction iron-manufacturing facility, and the reduced gas RG discharged to the upper portion of the upper reactor 200 can be supplied to the lower portion of another fluidized bed furnace.
  • the upper reactor 200 has a circular cylinder shape that has a larger volume compared to the lower reactor 100.
  • the upper reactor 200 forms a second fluidized bed space FS2 with a larger second diameter D2 compared to the first diameter D1 as a flat area.
  • the second diameter D2 may be 3 to 4 times the first diameter D1.
  • a minimum fluidized bed (or a bubbling fluidized bed) is formed due to the lower gas flow rate compared to the gas flow rate of the first fluidized bed space FS1.
  • the upper reactor 200 includes a charging port 210 into which fine iron ore is charged.
  • Fine iron ore is charged through the charging port 210 in the second fluidized bed space FS2 of the upper reactor 200.
  • the charging port 210 is disposed higher than half the height of an outer wall 201 of the upper reactor 200 and extends upward.
  • the tapered portion 300 directly connects between the lower reactor 100 and the upper reactor 200.
  • the tapered portion 300 forms a connection space CS that communicates between the first fluidized bed space FS1 and the second fluidized bed space FS2.
  • An outer wall 301 of the tapered portion 300 may have an angle of 45 degrees to 75 degrees with a second diameter D2 direction.
  • the tapered portion 300, the lower reactor 100, and the upper reactor 200 may be integrally formed, but are not limited thereto.
  • a plurality of nitrogen purge supply pipes 400 are disposed along the circumferential direction of the outer wall 201 of the upper reactor 200.
  • FIG. 2 shows the nitrogen purge supply pipes illustrated in FIG. 1 .
  • (A) shows an example of the nitrogen purge supply pipe 400 connected to the upper reactor 200.
  • the nitrogen purge supply pipe 400 is disposed on the lower portion of the outer wall 201 of the upper reactor 200, and is adjacent to the outer wall 301 of the tapered portion 300.
  • the nitrogen purge supply pipe 400 may extend in the same direction as the extension direction of the outer wall 301 of the tapered portion 300 in order to smooth the flow of the charged material from the upper reactor 200 to the tapered portion 300.
  • FIG. 2 shows an example of alignment of the plurality of nitrogen purge supply pipes 400 connected to the upper reactor 200.
  • each of the plurality of nitrogen purge supply pipes 400 may be disposed to have an angle of 45 degrees with the center of the second fluidized bed space FS2 along the circumference of the outer wall 201 of the upper reactor 200.
  • FIG. 2 shows another example of alignment of the plurality of nitrogen purge supply pipes 400 connected to the upper reactor 200.
  • each of the plurality of nitrogen purge supply pipes 400 may be disposed to have an angle of 30 degrees with the center of the second fluidized bed space FS2 along the circumference of the outer wall 201 of the upper reactor 200.
  • FIG. 3 shows the interior of the fluidized bed furnace according to the first embodiment.
  • the solid flow can mean the flow of fine iron ore and fine reduced iron
  • the solid presence region can mean the presence of fine iron ore and fine reduced iron.
  • the calm fluidized bed FB1 formed in the second fluidized bed space FS2 of the upper reactor 200 passes through the connection space CS of the tapered portion 300 and moves to the first fluidized bed space FS1 of the lower reactor 100, which is a turbulent region.
  • a turbulent fluidized bed FB2 is formed, thereby causing vigorous gas solid mixing. Accordingly, the occurrence of a fusion phenomenon in which fine reduced iron IO2 reduced in the turbulent fluidized bed FB2 aggregates with each other is minimized.
  • the fine reduced iron IO2 reduced in the lower reactor 100 is discharged to the outside of the lower reactor 100 through the discharge port 110 due to a pressure difference.
  • the charge which is the fine iron ore IO1 is reduced in the turbulent fluidized bed condition of the turbulent fluidized bed FB2.
  • the reduction occurs rapidly due to a high gas/ore ratio.
  • the fine reduced iron IO2 reduced in the first fluidized bed space FS1 is discharged through the discharge port 110 due to the pressure difference.
  • the fine reduced iron IO2 reduced by vigorous mixing in the first fluidized bed space FS1 of the lower reactor 100 can be scattered to the second fluidized bed space FS2 of the upper reactor 200 together with the reduced gas RG moving to the upper reactor 200.
  • the gas flow rate is reduced by the second fluidized bed space FS2 of the upper reactor 200, which is significantly wider than the first fluidized bed space FS1 of the lower reactor 100, the fine reduced iron IO2 scattered into the second fluidized bed space FS2 falls directly by gravity into the first fluidized bed space FS1 in the lower reactor 100.
  • a problem of fusion of fine reduced iron IO2 does not occur due to a bubble fluidized bed atmosphere, which is the calm fluidized bed FB1, in the second fluidized bed space FS2 of the upper reactor 200, and in the first fluidized bed space FS1 of the lower reactor 100, the reduction of fine reduced iron IO2 is accelerated to a turbulent fluidized bed atmosphere, which is the turbulent fluidized bed FB2, and is discharged through the discharge port 110 to minimize the problem of fusion of fine reduced iron IO2.
  • the fluidized bed furnace 1000 that minimizes scattering loss and minimizes fusion problems is provided.
  • the fluidized bed furnace 1000 that can use 100 % of fine iron ore as a raw material is provided.
  • FIG. 4 and FIG. 5 a fluidized bed furnace according to a second unclaimed embodiment will be described.
  • parts different from the fluidized bed furnace according to the first embodiment will be described.
  • FIG. 4 is a perspective view of a fluidized bed furnace according to a second embodiment.
  • a fluidized bed furnace 1002 includes a lower reactor 100, an upper reactor 200, a tapered portion 300, a plurality of nitrogen purge supply pipes 400, and a porous plate 500.
  • the porous plate 500 is disposed between a second fluidized bed space FS2 of the upper reactor 200 and a connection space CS of the tapered portion 300, and includes a plurality of through-holes.
  • the porous plate 500 is disposed between the second fluidized bed space FS2 and the connection space CS, and serves as a partitioning wall between the second fluidized bed space FS2 and the first fluidized bed space FS1.
  • the porous plate 500 may physically separate the upper reactor 200 and the lower reactor 100.
  • FIG. 5 shows the interior of the fluidized bed furnace according to the
  • the fine reduced iron IO2 reduced in the lower reactor 100 is discharged to the outside of the lower reactor 100 through the discharge port 110 due to a pressure difference.
  • the fluidized bed furnace 1002 that minimizes scattering loss and minimizes fusion problems is provided.
  • the fluidized bed furnace 1002 that can use 100 % of fine iron ore as a raw material is provided.
  • FIG. 6 and FIG. 7 a fluidized bed furnace according to a third embodiment will be described.
  • parts different from the fluidized bed furnace according to the first embodiment will be described.
  • FIG. 6 is a perspective view of a fluidized bed furnace according to a third embodiment.
  • a fluidized bed furnace 1003 includes a lower reactor 100, an upper reactor 200, a tapered portion 300, a plurality of nitrogen purge supply pipes 400, a porous plate 500, and a stand pipe 600.
  • the porous plate 500 is disposed between a second fluidized bed space FS2 of the upper reactor 200 and a connection space CS of the tapered portion 300, and includes a plurality of through-holes.
  • the porous plate 500 is disposed between the second fluidized bed space FS2 and the connection space CS, and serves as a partitioning wall between the second fluidized bed space FS2 and the first fluidized bed space FS1.
  • the porous plate 500 may physically separate the upper reactor 200 and the lower reactor 100.
  • the stand pipe 600 extends from the second fluidized bed space FS2 through the porous plate 500 to the first fluidized bed space FS1.
  • the stand pipe 600 is supported on the porous plate 500 corresponding to the first fluidized bed space FS1 of the lower reactor 100.
  • the stand pipe 600 facilitates the flow of fine iron ore from the upper reactor 200 to the lower reactor 100.
  • FIG. 7 shows the interior of the fluidized bed furnace according to the third embodiment.
  • the fine reduced iron IO2 reduced in the lower reactor 100 is discharged to the outside of the lower reactor 100 through the discharge port 110 due to a pressure difference.
  • the fluidized bed furnace 1003 that minimizes scattering loss and minimizes fusion problems is provided.
  • the fluidized bed furnace 1003 that can use 100 % of fine iron ore as a raw material is provided.
  • first fluidized bed space FS1 lower reactor 100
  • second fluidized bed space FS2 upper reactor 200
  • connection space CS tapered portion 300

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Manufacture Of Iron (AREA)
EP19889794.4A 2018-11-26 2019-11-22 Fluidized bed furnace Active EP3889532B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020180147506A KR102090550B1 (ko) 2018-11-26 2018-11-26 유동로
PCT/KR2019/016101 WO2020111666A1 (ko) 2018-11-26 2019-11-22 유동로

Publications (3)

Publication Number Publication Date
EP3889532A1 EP3889532A1 (en) 2021-10-06
EP3889532A4 EP3889532A4 (en) 2021-12-22
EP3889532B1 true EP3889532B1 (en) 2023-05-10

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ID=69999403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19889794.4A Active EP3889532B1 (en) 2018-11-26 2019-11-22 Fluidized bed furnace

Country Status (4)

Country Link
EP (1) EP3889532B1 (ko)
KR (1) KR102090550B1 (ko)
CN (1) CN113167534B (ko)
WO (1) WO2020111666A1 (ko)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3237177A1 (en) * 2021-11-30 2023-06-08 Shoji USHIO Facility for producing reduced iron and method for producing reduced iron

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0689389B2 (ja) * 1986-03-31 1994-11-09 新日本製鐵株式会社 鉱石類の流動層還元方法
AU596758B2 (en) * 1987-11-13 1990-05-10 Jp Steel Plantech Co. Metal-making apparatus involving the smelting reduction of metallic oxides
JPH0730375B2 (ja) * 1992-08-04 1995-04-05 川崎重工業株式会社 流動層炉
AT405942B (de) * 1995-03-17 1999-12-27 Voest Alpine Ind Anlagen Verfahren zur reduktion von feinerz sowie anlage zur durchführung des verfahrens
WO1998029574A1 (en) * 1996-12-28 1998-07-09 Pohang Iron & Steel Co., Ltd. Fluidized bed type reducing system for reducing fine iron ore
JPH11181510A (ja) * 1997-12-17 1999-07-06 Kawasaki Heavy Ind Ltd 流動層還元炉および粉粒体鉱石の還元方法
KR100778673B1 (ko) * 2005-12-26 2007-11-22 주식회사 포스코 용철 제조 장치

Also Published As

Publication number Publication date
EP3889532A1 (en) 2021-10-06
EP3889532A4 (en) 2021-12-22
CN113167534A (zh) 2021-07-23
WO2020111666A1 (ko) 2020-06-04
CN113167534B (zh) 2023-09-01
KR102090550B1 (ko) 2020-03-18

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