EP0166679B1 - Anordnung aus einem Vergaser und Direktreduktionsofen - Google Patents

Anordnung aus einem Vergaser und Direktreduktionsofen Download PDF

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Publication number
EP0166679B1
EP0166679B1 EP85730074A EP85730074A EP0166679B1 EP 0166679 B1 EP0166679 B1 EP 0166679B1 EP 85730074 A EP85730074 A EP 85730074A EP 85730074 A EP85730074 A EP 85730074A EP 0166679 B1 EP0166679 B1 EP 0166679B1
Authority
EP
European Patent Office
Prior art keywords
arrangement according
gasifier
gas
shaft
annular
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.)
Expired
Application number
EP85730074A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0166679A1 (de
Inventor
Klaus Langner
Rolf Dr. Hauk
Gero Dr. Papst
Michael Nagl
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.)
Primetals Technologies Austria GmbH
Deutsche Voest Alpine Industrieanlagenbau GmbH
Original Assignee
Voestalpine AG
Deutsche Voest Alpine Industrieanlagenbau GmbH
Korf Engineering GmbH
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 Voestalpine AG, Deutsche Voest Alpine Industrieanlagenbau GmbH, Korf Engineering GmbH filed Critical Voestalpine AG
Priority to AT85730074T priority Critical patent/ATE31942T1/de
Publication of EP0166679A1 publication Critical patent/EP0166679A1/de
Application granted granted Critical
Publication of EP0166679B1 publication Critical patent/EP0166679B1/de
Expired 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
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
    • C21B13/002—Reduction of iron ores by passing through a heated column of carbon
    • 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
    • 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 specially adapted for furnaces of these types
    • F27B1/20—Arrangements of devices for charging

Definitions

  • the invention relates to an arrangement according to the preamble of claim 1.
  • the reducing gas is generated in a melting vessel in which oxygen and powdered coal are blown onto a liquid iron bath which serves as the reaction medium and the ratio of CO and CO 2 influenced in the gas produced.
  • the reducing gas generated is fed directly into a direct reduction shaft furnace arranged above the melting vessel via a connecting shaft, in which it is cooled to the required reducing gas temperature by an injected coolant.
  • This contains a bottom in the form of an inverted cone, through which the pouring column can be supported in the shaft furnace.
  • the wall of the shaft furnace is led outwards, forming an annular gap above the floor.
  • the bottom layer of the sponge iron particles can be conveyed through the annular gap into the connecting shaft to the melting vessel by rotating a spiral-shaped slide in the center of the base. At the same time, the ascending reducing gas reaches the direct reduction shaft furnace via this annular gap.
  • the known arrangement assumes that the proportion of dust in the reducing gas introduced into the direct reduction shaft furnace via the connecting shaft is low.
  • A. Reducing gas with a high dust content, for example a gas such as that obtained in a fluidized bed gasifier or in the melter gasifier described in DE-PS 28 43 303, would shortly result in the intermediate spaces of the column in the lower region being clogged by the dust carried along.
  • the amount of reducing gas supplied to the direct reduction shaft furnace directly via its discharge openings for the sponge iron had to be limited to approximately 30% of the total amount required for the reduction process (DE-PS 30 34 539).
  • the object of this invention is to provide an arrangement of the type mentioned in the preamble of claim 1 in such a way that even a gas laden with a larger proportion of dust in the amount required for direct reduction can be fed directly from the gasifier to the direct reduction shaft furnace without it becoming one Clogging of the interstices of the pouring column due to the entrained dust and as a result of this an uneven gas distribution in the direct reduction shaft furnace and malfunctions occur.
  • the measures according to the invention increase the cross section of the gas into the column and thus reduce the gas velocity and the depth of penetration of the dust particles.
  • the constant increased movement of the sponge iron particles ensures the required gas permeability, especially in the penetration area of the reducing gas into the bed.
  • annular zone is created in the lower region of the pouring column, in which the iron sponge particles are kept in motion by a mechanical device which is particularly suitable for this purpose, and at the same time their rate of descent is increased.
  • This zone extends from the foot of the pouring column over a larger area of the bed and thus creates the possibility of increasing the inlet cross section for the reducing gas into the bed and thus, at a given throughput, the flow rate of the gas introduced into the bed and, as a result, the depth of penetration of the bed To reduce dust particles.
  • the sponge iron particles are continuously and evenly distributed over the circumference and withdrawn from the ring zone and fed to the melter gasifier or to the outside.
  • the sponge iron particles are preferably discharged from the direct reduction shaft furnace both to the outside via an annular gap or via downpipes and also to the inside through a central opening in the bottom of the direct reduction shaft furnace.
  • the conveying can be controlled in any direction by means of screw conveyors which can be driven in both directions of rotation.
  • all of the screw conveyors can alternately be conveyed outwards and then inwards in predetermined time periods, or a different sector-specific conveyance can be provided with the aim of keeping all sponge iron particles in motion in the ring zone and local clogging by means of the reducing gas avoid entrained dust.
  • Fig. 1 represents the upper in a longitudinal section Part of a carburetor 1 and the lower part of a direct reduction shaft furnace 2 arranged above.
  • the upper part of the pouring column consists of lumpy iron ore or iron oxide pellets charged from above into the direct reduction shaft furnace and in the lower part of the iron sponge particles formed from it by direct reduction.
  • the direct reduction shaft furnace is connected to the carburetor 1 by a connecting shaft 6.
  • the bottom formed by the support structure 3 and the table top 4 contains an annular gap 7 and a discharge opening designed as a central opening 8 for the sponge iron particles.
  • this annular gap is bridged at the points required for the attachment of the support structure.
  • Both discharge openings are shielded from the pouring column 5, namely by an annular contactor 9 or a cone 10.
  • the sponge iron particles are whirled through one another by a conveyor element formed from a plurality of radially arranged conveying screws 11 and from the lower section of the pouring column 5 both to the annular gap 7 and to the central opening 8 promoted.
  • the screw conveyors as indicated by double arrows 12, can be driven in both directions of rotation by individually assigned drives 13.
  • the radial arrangement of the screw conveyors can be seen in FIG. 2, which represents the section 11-11 of FIG. 1.
  • any other mechanically acting devices for swirling and preferably also for transporting the sponge iron particles can also be used; for example a rotor, a thrust segment or another driver device or also a vibration or vibrating device.
  • the ring apron 9, which serves to shield the annular gap 7, and the cone insert 10, which serves to shield the central opening 8, end just above the conveyor element formed by the screw conveyors 11.
  • the pouring column 5 is supported on the table top 4, which must be dimensioned taking into account these angles of repose.
  • An annular space 14 is formed behind the ring skirt 9 and above the natural angle of repose of the bed, via which reducing gas is introduced into the pouring column.
  • the interior of the direct reduction shaft furnace extends downward outside the upper end of the ring apron and the inside of the ring apron is flush with the inside of the wall section of the direct reduction shaft furnace 2 above.
  • the wall of the direct reduction shaft furnace could also be without extension in the area of the floor be trained if the ring apron is guided conically inwards.
  • the passage cross section for the sponge iron particles in the area adjacent above the conveying member is shaped into an annular zone 15, to which the hot reducing gas can be supplied from the carburetor 1 evenly distributed over the circumference.
  • this ring zone 15 is formed only by the cone insert 10 and the hot reducing gas is, as indicated by arrows 16 and 17, introduced through the annular gas inlet areas 18 and 19 evenly distributed over the circumference into the bulkhead 5.
  • the hot dust-laden reducing gas reaches a region of the pouring column 5 over a large inlet cross-section, in which the sponge iron particles are kept in constant motion by the screw conveyors 11 and are conveyed at an increased throughput speed compared to higher-lying zones.
  • the risk of local clogging of the interstices in the bulkhead can be further reduced and uniform through-gassing of the direct reduction shaft furnace can be achieved.
  • the sponge iron particles discharged via the annular gap 7 are fed through the connecting shaft 6 to the carburetor 1, which is designed as a melter gasifier, and the sponge iron particles discharged via the central opening 8 through a discharge pipe 20 via a nozzle 21 to the outside headed.
  • Modified constructions can of course also convey all iron sponge particles to the outside or into the carburetor 1 or, if necessary, make any division of the partial streams.
  • the 1 To reduce the temperature of the hot reducing gas obtained in the carburetor 1 to the temperature required for the direct reduction shaft furnace are in the 1 also provides indirect cooling by a heat exchanger 22 and direct cooling by adding cooling gas via a central cooling gas distributor 23.
  • the cooling gas is a reducing gas drawn off through a nozzle 24, which is cooled in a cooling gas scrubber 25 and then fed to the cooling gas distributor 23.
  • the reducing gas generated in the carburetor 1 passes through the connecting shaft 6, in which it is set to the required temperature, through the annular gap 7 or the central opening 8 into the annular space 14 or the space below the cone insert 10 and from there through the annular ones Gas inlet areas 18 and 19 into the pouring column.
  • the sponges 11 distributed over the circumference can continuously convey the sponge iron particles from the lowest section of the pouring column 5 outwards to the annular gap 7 or inwards to the central opening 8.
  • the screw conveyors can be designed to taper inwards towards the central opening 8 (not shown), or, as indicated by dash-dotted lines, wedges 26 can be arranged between adjacent screw conveyors, both towards the central opening 8 as well as converging upwards.
  • the second embodiment differs from the first one essentially in that the direct reduction shaft furnace 2 arranged above the carburetor is supported on its own supporting frame 31.
  • the bottom 32 of the direct reduction shaft furnace supporting the pouring column 5 has only a central opening 8 as a discharge opening for the sponge iron particles, so that the bottom can be supported in a stable manner without cooling problems.
  • Downpipes 33 can also be provided, of which one is shown in broken lines, which make it possible to convey the sponge iron into the carburetor 1 from the outer end of the screw conveyors.
  • stubs 34 are provided in each case in the outer region of the screw conveyors and these are each connected to the interior of the carburetor 1 by a down pipe 33.
  • the screw conveyors can of course also be driven in both directions of rotation, or a combination of screws which continuously convey to the outside and constantly convey to the inside can be provided.
  • the cone insert 10 has passage openings 38 into which the inner ends of the radially arranged screw conveyors 11 engage. These passage openings 38 form a gas inlet for the reducing gas rising in the carburettor shaft 6, specifically for the partial flow denoted by b.
  • Another partial stream c is introduced into the annular zone 15 through an annular gap 39 of the cone insert 10.
  • a partial flow passes through these into the pouring column.
  • the partial flow a forms approximately 65 volume percent
  • the partial flow b forms approximately 25 volume percent
  • the partial flow c forms approximately 10 volume percent of the hot reducing gas introduced into the ring zone 15.
  • the gas is introduced over a large cross-section, there is a low speed and a low penetration depth of dust particles carried along, so that the risk of clogging of the spaces between the sponge iron pellets is further reduced even with a reducing gas with a high dust content, and an even gas distribution can be ensured .
  • nozzles 40 are provided for introducing cooling gas.
  • the connecting shaft contains a compensation section 41, by means of which height differences from the floor 32 supported by the frame 31 can be compensated.
  • the drive 13 shown in FIGS. 3 and 5 is designed in the form of a ratchet mechanism, with each feed screw 11 being assigned two such drives if the feed screw is to be drivable in both directions of rotation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture Of Iron (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Processing Of Solid Wastes (AREA)
  • Fats And Perfumes (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Screw Conveyors (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Cosmetics (AREA)
  • Detergent Compositions (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
EP85730074A 1984-06-12 1985-05-29 Anordnung aus einem Vergaser und Direktreduktionsofen Expired EP0166679B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85730074T ATE31942T1 (de) 1984-06-12 1985-05-29 Anordnung aus einem vergaser und direktreduktionsofen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843422185 DE3422185A1 (de) 1984-06-12 1984-06-12 Anordnung aus einem vergaser und direktreduktionsofen
DE3422185 1984-06-12

Publications (2)

Publication Number Publication Date
EP0166679A1 EP0166679A1 (de) 1986-01-02
EP0166679B1 true EP0166679B1 (de) 1988-01-13

Family

ID=6238382

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85730074A Expired EP0166679B1 (de) 1984-06-12 1985-05-29 Anordnung aus einem Vergaser und Direktreduktionsofen

Country Status (15)

Country Link
US (1) US4605205A (enrdf_load_stackoverflow)
EP (1) EP0166679B1 (enrdf_load_stackoverflow)
JP (1) JPS613813A (enrdf_load_stackoverflow)
KR (1) KR930001947B1 (enrdf_load_stackoverflow)
CN (1) CN1004706B (enrdf_load_stackoverflow)
AT (1) ATE31942T1 (enrdf_load_stackoverflow)
AU (1) AU585858B2 (enrdf_load_stackoverflow)
BR (1) BR8502778A (enrdf_load_stackoverflow)
CA (1) CA1241833A (enrdf_load_stackoverflow)
CS (1) CS277403B6 (enrdf_load_stackoverflow)
DD (1) DD235269A5 (enrdf_load_stackoverflow)
DE (2) DE3422185A1 (enrdf_load_stackoverflow)
IN (1) IN163456B (enrdf_load_stackoverflow)
SU (1) SU1466653A3 (enrdf_load_stackoverflow)
ZA (1) ZA853988B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19750773A1 (de) * 1996-11-12 1998-05-14 Voest Alpine Ind Anlagen Vorrichtung zum Austragen bzw. Durchmischen von stückigem Gut

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DE3723137C1 (de) * 1987-07-13 1989-03-16 Voest Alpine Ind Anlagen Vorrichtung zur Beschickung eines Einschmelzvergasers mit Vergasungsmitteln und Eisenschwamm
US5354356A (en) * 1992-10-06 1994-10-11 Bechtel Group Inc. Method of providing fuel for an iron making process
US5320676A (en) * 1992-10-06 1994-06-14 Bechtel Group, Inc. Low slag iron making process with injecting coolant
US5259864A (en) * 1992-10-06 1993-11-09 Bechtel Group, Inc. Method of disposing of environmentally undesirable material and providing fuel for an iron making process e.g. petroleum coke
US5380352A (en) * 1992-10-06 1995-01-10 Bechtel Group, Inc. Method of using rubber tires in an iron making process
US5397376A (en) * 1992-10-06 1995-03-14 Bechtel Group, Inc. Method of providing fuel for an iron making process
US5338336A (en) * 1993-06-30 1994-08-16 Bechtel Group, Inc. Method of processing electric arc furnace dust and providing fuel for an iron making process
US6197088B1 (en) 1992-10-06 2001-03-06 Bechtel Group, Inc. Producing liquid iron having a low sulfur content
US5429658A (en) * 1992-10-06 1995-07-04 Bechtel Group, Inc. Method of making iron from oily steel and iron ferrous waste
JPH06193845A (ja) * 1992-12-25 1994-07-15 Shigeru Saito 被焼却物の投入装置及びそれを用いた焼却炉
US5958107A (en) * 1993-12-15 1999-09-28 Bechtel Croup, Inc. Shift conversion for the preparation of reducing gas
DE19623246C1 (de) 1996-05-30 1997-10-02 Voest Alpine Ind Anlagen Verfahren und Vorrichtung zur Beschickung eines Einschmelzvergasers mit Vergasungsmitteln und Eisenschwamm
AT405651B (de) * 1996-10-08 1999-10-25 Voest Alpine Ind Anlagen Vorrichtung zum dosierten einbringen von feinteilchenförmigem material in ein reaktorgefäss
KR100276324B1 (ko) * 1996-12-20 2000-12-15 이구택 용융환원 장치 및 이를 이용한 용융선철 제조방법
AT405332B (de) * 1997-07-14 1999-07-26 Voest Alpine Ind Anlagen Schachtofen
DE19739443C2 (de) * 1997-09-02 2000-02-10 Voest Alpine Ind Anlagen Vorrichtung zur Erzeugung von Eisenschwamm
AT407192B (de) 1998-08-13 2001-01-25 Voest Alpine Ind Anlagen Schachtofen
AT505490B1 (de) 2007-06-28 2009-12-15 Siemens Vai Metals Tech Gmbh Verfahren und vorrichtung zur erzeugung von eisenschwamm
WO2011162427A1 (ko) * 2010-06-23 2011-12-29 주식회사 포스코 가스류 분포가 균일한 환원로
CN102409128B (zh) * 2011-12-06 2013-03-27 刘元生 一种煤基熔融床制气还原铁的工艺
JP6304957B2 (ja) * 2013-07-10 2018-04-04 中央発條株式会社 ショットピーニング装置
CN103409577B (zh) * 2013-08-10 2015-09-09 山西鑫立能源科技有限公司 连续外热式还原气直接还原铁方法
EP3255158A1 (de) * 2016-06-09 2017-12-13 Primetals Technologies Austria GmbH Verfahren und vorrichtung zur direktreduktion unter ventgasnutzung
EP3255157A1 (de) * 2016-06-09 2017-12-13 Primetals Technologies Austria GmbH Verfahren zur direktreduktion mit trockener ventgasentstaubung

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19750773A1 (de) * 1996-11-12 1998-05-14 Voest Alpine Ind Anlagen Vorrichtung zum Austragen bzw. Durchmischen von stückigem Gut
DE19750773C2 (de) * 1996-11-12 1999-03-25 Voest Alpine Ind Anlagen Vorrichtung zum Austragen bzw. Durchmischen von stückigem Gut
AT406299B (de) * 1996-11-12 2000-03-27 Voest Alpine Ind Anlagen Vorrichtung zum austragen bzw. durchmischen von stückigem gut

Also Published As

Publication number Publication date
AU585858B2 (en) 1989-06-29
BR8502778A (pt) 1986-02-18
CA1241833A (en) 1988-09-13
IN163456B (enrdf_load_stackoverflow) 1988-09-24
CS425585A3 (en) 1992-01-15
JPH0585607B2 (enrdf_load_stackoverflow) 1993-12-08
EP0166679A1 (de) 1986-01-02
DD235269A5 (de) 1986-04-30
SU1466653A3 (ru) 1989-03-15
CN1004706B (zh) 1989-07-05
DE3422185A1 (de) 1985-12-12
ZA853988B (en) 1986-01-29
DE3561401D1 (en) 1988-02-18
JPS613813A (ja) 1986-01-09
AU4283285A (en) 1985-12-19
US4605205A (en) 1986-08-12
DE3422185C2 (enrdf_load_stackoverflow) 1987-09-24
CN85104511A (zh) 1987-07-08
ATE31942T1 (de) 1988-01-15
KR930001947B1 (ko) 1993-03-20
CS277403B6 (en) 1993-03-17
KR860000356A (ko) 1986-01-28

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