EP0998586B1 - Schachtofen - Google Patents

Schachtofen Download PDF

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Publication number
EP0998586B1
EP0998586B1 EP98935032A EP98935032A EP0998586B1 EP 0998586 B1 EP0998586 B1 EP 0998586B1 EP 98935032 A EP98935032 A EP 98935032A EP 98935032 A EP98935032 A EP 98935032A EP 0998586 B1 EP0998586 B1 EP 0998586B1
Authority
EP
European Patent Office
Prior art keywords
shaft furnace
devices
worm
worm conveyors
conveyors
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 - Lifetime
Application number
EP98935032A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0998586A1 (de
Inventor
Ernst Eichberger
Wilhelm Stastny
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
Voest Alpine Industrienlagenbau GmbH
Deutsche Voest Alpine Industrieanlagenbau 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 Voest Alpine Industrienlagenbau GmbH, Deutsche Voest Alpine Industrieanlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Publication of EP0998586A1 publication Critical patent/EP0998586A1/de
Application granted granted Critical
Publication of EP0998586B1 publication Critical patent/EP0998586B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/21—Arrangements of devices for discharging

Definitions

  • the invention relates to a shaft furnace, in particular a direct reduction shaft furnace, with a bed of lumpy material, in particular iron oxide and / or sponge iron containing lumpy material, with star-shaped as screw conveyors above the bottom region of the shaft furnace Discharge devices for the lumpy good, as well as over the discharge devices Inlet openings for a reducing gas are arranged.
  • Shaft furnaces in particular reduction shaft furnaces of the type described above, are numerous known from the prior art.
  • One such, essentially as a cylindrical hollow body trained shaft furnace generally contains a bed of iron oxide and / or Lumpy material containing sponge iron, the material containing iron oxide in the upper part of the shaft furnace is abandoned.
  • a reducing gas originating, for example, from a melter gasifier is introduced into the Shaft furnace and thus blown into the solid bed.
  • the hot dust-laden Reducing gas flows upwards through the solid bed and thereby reduces this Partial or partial iron oxide to form sponge iron.
  • the fully or partially reduced iron oxide is between the bottom of the Discharge devices arranged in the shaft furnace and the area of the gas inlet openings conveyed out of the shaft furnace.
  • These discharge devices are usually called Star-shaped arrangement of screw conveyors conveying radially (in relation to the shaft furnace) educated.
  • the zone in the area of the shaft floor in which the discharge devices are located should have a maximum of active discharge area, on the one hand as possible to achieve even lowering of the bulk material, furthermore one should continuous movement or mixing of the material in the reaction zone guaranteed become.
  • this is the central area that is arranged in a star shape Discharge devices is not detected and remains almost motionless.
  • the second zone is formed by the wedge-shaped areas between two discharge devices, where the pyramids built up in these dead zones on the one hand Inhibit solids flow and on the other hand build up so far that the Gas inlet slots for the reducing gas through the bulk material building up are covered, with a relative by the dust load of the reducing gas forms impermeable bed. This has the consequence that the necessary homogeneous No gas distribution in the shaft furnace.
  • EP-B-0 116 679 describes screws for moving solid particles in one Shaft furnace and described for discharging the same. It is radial arranged, cantilevered snails of the same length and a cylindrical Have cross-section. The blind spots between the snails are admittedly Wedge-shaped fixtures minimized, but the construction of "dead men" cannot be prevented.
  • EP-B-0 085 290 discloses arrangements of short tapered screws, both in a conical installation in the middle, which also serves as a pouring cone, as are also stored on the circumference of the shaft furnace. By the one in the middle conical installation can hold back the training of the central "dead man” but there are still inactive zones between the neighboring ones Discharge devices used to train the undesirable Lead pyramids.
  • the object of the present invention is therefore the training of Filling pyramids between two neighboring discharge devices on the inside
  • the invention is characterized in that between the area formed by the inlet openings and the area formed by the discharge devices means for moving the in the shaft furnace located goods are arranged in a star shape.
  • the structure of Bulk pyramids in or over the area of the gas inflow slots effectively prevented.
  • This arrangement can, especially in the upper part of the shaft, the area of the Reaction space in which the reduction processes take place, a largely area-wide Mixing and lowering of the reaction material can be achieved.
  • the number of devices for moving the one located in the shaft furnace is preferred Good twice the number of discharge devices for the lumpy good.
  • By the large number of movement devices is a homogeneous discharge of the Good reaction achieved.
  • Two movement devices are particularly preferred, each in pairs Discharge device assigned that each of the two movement devices are both above and next to, one on the left and the second on the right of the discharge device located.
  • This particular arrangement of the movement devices according to the invention causes the pyramids to be eroded from their edges.
  • a preferred embodiment is that the movement devices as Screw conveyors are designed, the screw surfaces of the screw conveyors possibly an infinity over at least a partial area of a screw conveyor have a large slope.
  • the screw surfaces of the screw conveyors of interchangeable and / or fixed paddles mounted on the shafts of the screw conveyors educated. Experience has shown that such paddles when moving iron oxide and / or material containing sponge iron, strong mechanical and abrasive influences are exposed. If maintenance work is now to be carried out on the screw conveyors, so it is of great advantage if not the entire screw has to be replaced, but if only the damaged paddles can be replaced.
  • the shafts of the screw conveyors are one-sided, stored on the fly and cooled if necessary.
  • the shape of the waves is in the essentially cylindrical, but the shafts can optionally have at least one Part of its length with a constant and / or non-constant slope inwards, i.e. in Tapered towards the center of the shaft furnace.
  • the envelope of the screw surfaces each of a screw conveyor substantially cylindrical, but can optionally over at least a portion with a constant and / or non-constant slope inwards be conically tapered.
  • the screw surface is each screw conveyor formed such that each screw conveyor in the direction of the center of the shaft furnace or conveys away from the center or radially to the screw conveyor.
  • the screw conveyors are for permanent or temporary use arranged axially movable.
  • This configuration has the one hand The advantage that each of the screw conveyors is easily accessible for maintenance work, on the other hand it is not necessary to keep each screw conveyor in operation permanently, but only temporarily Dismantling of the pyramids.
  • the direction of rotation is each individual Screw conveyor continuously or discontinuously clockwise or counterclockwise or but oscillating. Due to the flexibility of the rotary movement and direction, the respective geometric conditions of the pyramids are taken into account. About that In addition, a homogeneous mixing of the reaction material is ensured.
  • the oscillation or rotary movement in each case two screw conveyors assigned in pairs to a discharge device in opposite directions.
  • the conveying direction is essentially radial, but can optionally have a slight axial component.
  • the head of each screw conveyor is in itself known manner designed as a drill bit. This means that when used temporarily Drilling into a solid pyramid allows.
  • the drive for the shafts Screw conveyor motors provided.
  • the shafts are driven by motors, the given a flexible adaptation of the screw conveyor to the process and the other is the installation and removal, since the drive is arranged on the travel device anyway, facilitated.
  • Snail sensors provided.
  • undesirable drilling behavior a snail is the deviation of the snail head from the desired direction when To understand drilling into a bed that may be partially stuck.
  • the process Drilling is a sensitive task and, in the event of misconduct by the operating personnel, one thing expensive repair-causing operation.
  • the sensor system is therefore an important part of the Process control.
  • a further feature of the invention is a regulation of the speeds and / or Drilling behavior of the individual shafts of the screw conveyors, the conveying characteristics and / or corresponding to the drilling behavior. This allows the Movement characteristics of the worm and the drill head each Process requirements are adjusted.
  • a shaft furnace 1 contains in its Inside a solid bed 2, soft solid through the bottom 3 of the shaft furnace 1 star-shaped discharge devices 4 is discharged from the shaft furnace 1. Hiss the star-shaped discharge devices 4 (as screw conveyors educated; not shown) high pyramids 5 have built up, which over protrude part of the gas inflow slots 6 and cover them. The active volume of the shaft furnace 1 is reduced by the volume of the pyramids 5 and the Solid bed is not evenly gasified.
  • FIG. 2 shows a shaft furnace 1 with movement devices arranged according to the invention 7.
  • Two discharge devices 7 are assigned to each discharge device 4 both above and next to it, one on the left and the second on the right of the Discharge device 4 are located.
  • FIG. 3 shows a shaft furnace 1 with movement devices arranged according to the invention 7, and fill pyramids 5, which are arranged by using the inventive Movement devices 7 are reduced.
  • the gas inflow slots 6 are no longer the pyramids 5 covered.
  • the solid bed 2 is evenly gasified and the active volume of the shaft furnace 1 is increased.
  • each discharge device 4 has 2 Movement devices 7 assigned.
  • the wedge-shaped region 8 is between two Discharge devices 4, over which the pyramids build up, are reduced in size. Since the Angle of repose is a constant, material-dependent size, with a reduced footprint is the Filling pyramid also reduced the height.
  • Fig. 5 shows a detailed view of a discharge device 4 with 2 overlying Movement devices 7, which are designed here as screw conveyors. Arrows 8 indicate that Direction of rotation of the movement devices 7, which are opposite to each other. As a result, material from the filling pyramids (not shown here) to the The discharge area of the discharge devices 4 is conveyed.

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)
  • Furnace Charging Or Discharging (AREA)
  • Manufacture Of Iron (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Screw Conveyors (AREA)
EP98935032A 1997-07-14 1998-07-10 Schachtofen Expired - Lifetime EP0998586B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0119797A AT405332B (de) 1997-07-14 1997-07-14 Schachtofen
AT119797 1997-07-14
PCT/EP1998/004292 WO1999004045A1 (de) 1997-07-14 1998-07-10 Schachtofen

Publications (2)

Publication Number Publication Date
EP0998586A1 EP0998586A1 (de) 2000-05-10
EP0998586B1 true EP0998586B1 (de) 2002-03-13

Family

ID=3508714

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98935032A Expired - Lifetime EP0998586B1 (de) 1997-07-14 1998-07-10 Schachtofen

Country Status (14)

Country Link
US (1) US6213762B1 (ko)
EP (1) EP0998586B1 (ko)
JP (1) JP2002511906A (ko)
KR (1) KR100557230B1 (ko)
CN (1) CN1071381C (ko)
AT (1) AT405332B (ko)
AU (1) AU744469B2 (ko)
BR (1) BR9811694A (ko)
CA (1) CA2296318A1 (ko)
DE (1) DE59803356D1 (ko)
PL (1) PL338180A1 (ko)
TW (1) TW407166B (ko)
WO (1) WO1999004045A1 (ko)
ZA (1) ZA986239B (ko)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT407192B (de) * 1998-08-13 2001-01-25 Voest Alpine Ind Anlagen Schachtofen
IT1314530B1 (it) * 2000-07-12 2002-12-18 Sms Demag S P A Italimpianti D Coclea di scarico per suole mobili.
AT505490B1 (de) * 2007-06-28 2009-12-15 Siemens Vai Metals Tech Gmbh Verfahren und vorrichtung zur erzeugung von eisenschwamm
KR101048527B1 (ko) * 2008-08-26 2011-07-12 한국지질자원연구원 수직형 소성로를 이용한 자열 소성체 제조방법
AT511738B1 (de) * 2011-07-21 2013-04-15 Siemens Vai Metals Tech Gmbh Schmelzreduktionsaggregat und verfahren zum betrieb eines schmelzreduktionsaggregats
CN102417945A (zh) * 2011-11-04 2012-04-18 张昭贵 具有中心配气装置的竖炉和控制配气量的方法
WO2019171146A1 (en) * 2018-03-08 2019-09-12 Hyl Technologies, S.A. De C.V. Container, device and method for storing or processing particulate materials to minimize or eliminate vibrations such as quaking or shaking
CN111910037B (zh) * 2020-08-07 2022-01-25 唐山中科乾海环保科技有限公司 竖炉直接还原装置及其排料方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2862808A (en) * 1957-07-31 1958-12-02 Alan N Mann Apparatus and method for reducing iron oxide pellets
US3704011A (en) * 1971-08-12 1972-11-28 Mintech Corp Discharge mechanism for shaft kiln
US4118017A (en) * 1976-01-02 1978-10-03 United States Steel Corporation Shaft furnace design
US4336131A (en) * 1978-09-25 1982-06-22 Midland-Ross Corporation Gasification furnace with discharge hopper
AT372109B (de) * 1982-01-11 1983-09-12 Voest Alpine Ag Vorrichtung zum austragen von heissem gut, insbesondere von eisenschwamm aus einem schachtofen
DE3422185A1 (de) * 1984-06-12 1985-12-12 Korf Engineering GmbH, 4000 Düsseldorf Anordnung aus einem vergaser und direktreduktionsofen
AT387037B (de) 1987-06-15 1988-11-25 Voest Alpine Ag Schachtofen zur thermischen behandlung von einsatzstoffen mit gasfoermigen medien
AT406299B (de) 1996-11-12 2000-03-27 Voest Alpine Ind Anlagen Vorrichtung zum austragen bzw. durchmischen von stückigem gut
KR100276324B1 (ko) * 1996-12-20 2000-12-15 이구택 용융환원 장치 및 이를 이용한 용융선철 제조방법

Also Published As

Publication number Publication date
PL338180A1 (en) 2000-10-09
KR100557230B1 (ko) 2006-03-07
CN1263563A (zh) 2000-08-16
DE59803356D1 (de) 2002-04-18
ZA986239B (en) 1999-02-05
ATA119797A (de) 1998-11-15
JP2002511906A (ja) 2002-04-16
EP0998586A1 (de) 2000-05-10
TW407166B (en) 2000-10-01
AU744469B2 (en) 2002-02-21
AT405332B (de) 1999-07-26
KR20010021805A (ko) 2001-03-15
US6213762B1 (en) 2001-04-10
CN1071381C (zh) 2001-09-19
CA2296318A1 (en) 1999-01-28
AU8441898A (en) 1999-02-10
WO1999004045A1 (de) 1999-01-28
BR9811694A (pt) 2000-09-26

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