EP0210658B1 - Vorrichtung zum Abtrennen von Überkorn aus dem heissen Austragsmaterial eines Drehrohrofens bei der Direktreduktion von eisenoxidhaltigen Materialien zu Eisenschwamm - Google Patents

Vorrichtung zum Abtrennen von Überkorn aus dem heissen Austragsmaterial eines Drehrohrofens bei der Direktreduktion von eisenoxidhaltigen Materialien zu Eisenschwamm Download PDF

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Publication number
EP0210658B1
EP0210658B1 EP86110565A EP86110565A EP0210658B1 EP 0210658 B1 EP0210658 B1 EP 0210658B1 EP 86110565 A EP86110565 A EP 86110565A EP 86110565 A EP86110565 A EP 86110565A EP 0210658 B1 EP0210658 B1 EP 0210658B1
Authority
EP
European Patent Office
Prior art keywords
gas
tight
grate
container
sieve
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
EP86110565A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0210658A1 (de
Inventor
Helmut Ernst
Alfred Breier
Manfred Schwalbach
Karl-Heinz Will
Alan Buchanan Cameron
Peter Cecil Bates
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.)
GEA Group AG
New Zealand Steel Ltd
Original Assignee
Metallgesellschaft AG
New Zealand Steel 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 Metallgesellschaft AG, New Zealand Steel Ltd filed Critical Metallgesellschaft AG
Publication of EP0210658A1 publication Critical patent/EP0210658A1/de
Application granted granted Critical
Publication of EP0210658B1 publication Critical patent/EP0210658B1/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
    • C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary 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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/33—Arrangement 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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/32—Arrangement of devices for charging
    • F27B2007/3282—Details
    • F27B2007/3294—Means to fluidise the charge in the air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0038—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising shakers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/007—Cooling of charges therein
    • F27D2009/0081—Cooling of charges therein the cooling medium being a fluid (other than a gas in direct or indirect contact with the charge)
    • F27D2009/0083—Cooling of charges therein the cooling medium being a fluid (other than a gas in direct or indirect contact with the charge) the fluid being water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0035—Devices for monitoring the weight of quantities added to the charge

Definitions

  • the invention relates to a device for separating oversize from the hot discharge material of a rotary kiln in the direct reduction of iron oxide-containing materials to sponge iron, consisting of a stationary furnace head, which includes the discharge end of the rotary kiln gas-tight, a sieve-like separating device inclined in the furnace head, one arranged on the furnace head Discharge device for the oversize grain and a discharge device for the grain passing through the sieve-like separating device.
  • the discharge material from the rotary kiln consists of a mixture of sponge iron, excess coal, ash and possibly a desulfurizing agent. It is carried out at a temperature of around 800 to 1200 ° C.
  • the discharge material may also contain oversize pieces, such as fallen off attachments, agglomerated parts of the feed or pieces from the refractory lining. This oversize must be removed before the discharge material melts. If the discharge material is to be charged into the melting furnace when it is hot, the oversize particles must be separated off when it is hot and the discharge material must be protected from the entry of air in order to avoid reoxidation. In some cases, the fine grain should also be sieved while hot before the material is charged into the melting furnace. In this case too, reoxidation must be avoided.
  • a separating device is known from DE-OS-3 123 589, in which a coarse grate is initially arranged in the furnace head for separating the oversize particles, the oversize particles falling out of the furnace head through a flap.
  • a vibrating or vibrating sieve is arranged under the coarse grate. The fine grain falls through a chute into a cooling drum, and the production falls from the sieve through a chute into a mobile transport container, which is emptied into an electric furnace. With this arrangement, the transport container can be overfilled, which causes considerable problems.
  • the rotary kiln must be shut down in the event of a malfunction in the removal of production.
  • the invention has for its object to enable smooth removal and transport of the separated hot material and to avoid shutdowns of the rotary kiln.
  • the sieve-like separating device is designed as a rigid, cooled grate 1
  • a collecting container 3 for oversize grain is arranged on the furnace head 2
  • the collecting container 3 is provided with a closure slide 4 at the discharge end
  • the collecting container 3 is provided by an outer container 5 is enclosed in a gas-tight manner
  • the outer container 5 is equipped with a gas-tight closure flap 6 and a gas-tight connection 7 for a transport container 8
  • the furnace head 2 under the grate 1 is designed as a buffer bunker 9 for the grain that falls through, and a metering bunker 10 on the buffer bunker 9 a gas-tight upper closure device 11 is connected
  • the dosing hopper 10 on the discharge side is equipped with a gas-tight lower closure device 12 and a gas-tight connection 13 for a transport container 14, and the volume of the dosing bunker 10 is smaller than the volume of the transport container 14.
  • the furnace head can be designed to be movable for repair purposes.
  • the grate can be cooled by means of liquid or gaseous cooling media which are introduced into the grate, flow through the grate or parts of the grate and are then removed again from the grate. Water is generally used as the cooling medium.
  • the collecting container for the oversize grain expediently consists of an inclined chute into which the oversize grain falls from the grate and is collected when the slide valve is closed.
  • the outer container encloses the discharge end of the collecting container in a gas-tight manner and is designed such that the closure slide has space in it in the open position and that the closure flap can be arranged in the outer container below the discharge end of the collecting container. If a transport container is connected to the outer container, both the slide valve and the flap can be in the open position so that oversize particles immediately fall into the transport container. If the oversize is collected in the collection container with the closure slide closed, the closure flap is first opened before the collection container is emptied, so that the oversize does not fall onto the closed closure flap.
  • the gas-tight closure devices between the buffer bunker and the dosing bunker and at the discharge end of the dosing bunker are expediently designed as a gas-tight material slide.
  • the smaller volume of the dosing hopper compared to the volume of the transport container prevents the transport container from being overfilled and prevents the slide from closing against a material column.
  • the usable volume of the dosing hopper is expediently set to 75 to 90%, preferably approximately 85%, of the usable volume of the transport container.
  • the filling of the dosing bunker from the buffer bunker with the outlet slide closed and open The inlet slide is preferably such that the dosing hopper is not completely filled. This ensures that the upper slide does not have to be closed against a material column. This can be done by selecting the timing of the filling of the dosing bunker from the buffer bunker so that the volume of material present in the buffer bunker is smaller than the usable volume of the dosing bunker. The required timing can, for. B. can be determined by measuring probes.
  • closure slide 4 is formed on the collecting container 3 as a segment slide.
  • a segment slide is particularly insensitive to the impact of hot oversize particles.
  • a preferred embodiment is that the grate 1 is arranged at an angle of 25 to 32 ° to the horizontal. This angle results in very good separation results without the risk of the grate becoming blocked.
  • the grate 1 consists of cooled longitudinal bars 15 and cross bars 16 below the sliding plane 17 of the longitudinal bars 15. This ensures that the material slides well and prevents slate-like, larger pieces from falling through. In addition, an expansion of the gap opening between the longitudinal bars is prevented by deformation of the longitudinal bars.
  • the cross bars do not require cooling.
  • a preferred embodiment is that the cross rungs 16 are fixed on one side to the longitudinal bars 15. This prevents the transfer of thermal expansion and makes it easy to replace.
  • a preferred embodiment consists in that an overflow point 18 is arranged between the buffer bunker 9 and the collecting container 3.
  • the overflow point enables the entire material to be discharged through one of the two discharge lines if there is a fault in the other discharge line.
  • a preferred embodiment is that under the grate 1, a driven screen 19 is arranged with an opposite inclination to the grate 1, the coarse grain falls into the buffer bunker 9, and between the buffer bunker 9 and the collecting container 3, a second buffer bunker 20 for through the sieve 19 falling fine grain is arranged, the second buffer bunker 20 is equipped with a gas-tight closure device 21 and is connected to a cooler 23 with a connecting line 22.
  • the coarse grain as product fraction can be separated from the fine grain (abrasion, ash, desulfurizing agent, excess coal) in the hot state from the material if this separation is required for further processing.
  • the cooler is connected to the connecting line in a gas-tight manner and is in an oven atmosphere. The cooling takes place indirectly.
  • the supporting structure of the sieve is cooled.
  • the stationary furnace head 2 encloses the discharge end of the rotary kiln 24 in a gas-tight manner.
  • the discharge material falls onto the rigid grate 1.
  • Cooling water is introduced into the grate 1 via line 25, and the heated cooling water is discharged via line 26.
  • the grate 1 is arranged at an angle of 30 °.
  • the oversized grain falls from the end of the grate 1 into the collecting container 3, the discharge end of which is closed by the segment slide 4.
  • the collecting container 3 and the segment slide 4 are enclosed gas-tight by the outer container 5.
  • the gas-tight closure flap 6 is arranged inside the outer container 5.
  • the flap 6 seals against the seals 27 which are fastened to the walls 28.
  • the seal 27 is arranged so that it lies outside the material flow.
  • a gas-tight telescopic connection 7 for the transport container 8 is arranged.
  • the closure flap 6 is brought into the open position 6a and then the segment slide 4 is brought into the open position 4a.
  • the material falling through the grate 1 falls into the buffer bunker 9.
  • a gas-tight slide 11 is arranged as a closure device, to which the dosing bunker 10 is connected.
  • the dosing hopper 10 has a gas-tight slide 12 as a closure device at the lower end.
  • a gas-tight telescopic connection 13 for the transport container 14 is arranged on the slide 12.
  • the drives for the locking devices are connected to one another in such a way that incorrect operation is prevented.
  • Buffer bunker 9 and collecting container 3 are connected to one another by an overflow weir 18 as an overflow point, so that the rotary kiln operation does not have to be interrupted immediately in the event of a transport system malfunction.
  • a mechanically driven sieve 19 is additionally arranged in the kiln 2 below the grate 1 and has an opposite tendency to the grate 1.
  • the drive 29 for the screen 19 is arranged outside the furnace head 2.
  • the Supporting structure for the screen covering is cooled by cooling water which is introduced via line 30 and is discharged via line 31.
  • the material falling through the grate 1 is fed to the screen 19 via the chute 32.
  • the coarse material falls as a product fraction from the sieve 19 into the buffer bunker 9.
  • the fine-grained material falling through the sieve falls into the second buffer bunker 20, which has a gas-tight slide 21 as a closure device at the lower end.
  • a connecting line 22 is connected to the slide 21 and leads gas-tight into the rotary tube cooler 23.
  • the slide 21 can be constantly open and can only be closed for repair work.
  • An overflow weir 18a is arranged between the buffer bunker 9 and the second buffer bunker 20.
  • the grate 1 ( Figures 3 and 4) consists of longitudinal bars 15, each having a water inlet 25 and water outlet 26.
  • the cross rungs 16 are attached to the longitudinal rods 15 below the sliding planes 17 of the longitudinal rods 15.
  • the cross rungs 16 are each fixed on one side to a longitudinal bar 15, so that no constraints can occur due to thermal expansion.
  • the advantages of the invention are that the separated, hot material can be discharged into the transport container with complete exclusion of air, an exact metering of the volume carried out takes place and thus an overfilling of transport containers is avoided with certainty.
  • the other transport route can be used to discharge all of the material, thus preventing the rotary kiln from being shut down immediately.

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  • 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)
  • Furnace Details (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP86110565A 1985-08-01 1986-07-30 Vorrichtung zum Abtrennen von Überkorn aus dem heissen Austragsmaterial eines Drehrohrofens bei der Direktreduktion von eisenoxidhaltigen Materialien zu Eisenschwamm Expired EP0210658B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3527621 1985-08-01
DE19853527621 DE3527621A1 (de) 1985-08-01 1985-08-01 Vorrichtung zum abtrennen von rberkorn aus dem heissen austragsmaterial eines drehrohrofens bei der direktreduktion von eisenoxidhaltigen materialien zu eisenschwamm

Publications (2)

Publication Number Publication Date
EP0210658A1 EP0210658A1 (de) 1987-02-04
EP0210658B1 true EP0210658B1 (de) 1988-12-14

Family

ID=6277408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86110565A Expired EP0210658B1 (de) 1985-08-01 1986-07-30 Vorrichtung zum Abtrennen von Überkorn aus dem heissen Austragsmaterial eines Drehrohrofens bei der Direktreduktion von eisenoxidhaltigen Materialien zu Eisenschwamm

Country Status (8)

Country Link
US (1) US4680009A (es)
EP (1) EP0210658B1 (es)
AU (1) AU578006B2 (es)
BR (1) BR8603636A (es)
DE (2) DE3527621A1 (es)
ES (1) ES2000811A6 (es)
IN (1) IN164017B (es)
NZ (1) NZ216873A (es)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9203268D0 (en) * 1992-02-15 1992-04-15 British Nuclear Fuels Plc A metering system
US5915308A (en) * 1996-01-18 1999-06-29 Siemens Aktiengesellschaft Discharge apparatus
CA2243480A1 (en) * 1996-01-18 1997-07-24 Siemens Aktiengesellschaft Delivery device
CN1089371C (zh) * 1999-11-10 2002-08-21 天津钢管还原铁厂 一种常温海绵铁除氧剂生产方法
EP1178277A1 (de) * 2000-04-25 2002-02-06 BMH Claudius Peters GmbH Verfahren und Vorrichtung zum Vergleichmässigen des Brenngut-Abwurfstroms eines Drehrohrofens zu einem Kühler
US6474985B1 (en) 2002-04-17 2002-11-05 Metso Minerals Industries, Inc. Toothed grate for rotary kiln peripheral discharge openings
CN100348736C (zh) * 2003-12-18 2007-11-14 岳庆丰 Qf－ly法生产球状、扁球状和方块状的海绵铁的新工艺
CN100567509C (zh) * 2005-12-31 2009-12-09 岳庆丰 无外燃烧室的隧道窑及其组合隧道窑生产直接还原铁
DE102012103588A1 (de) 2012-04-24 2013-10-24 Thyssenkrupp Resource Technologies Gmbh Anlage und Verfahren zur Wärmebehandlung von körnigem und stückigem Material
DE102018215348A1 (de) * 2018-09-10 2020-03-12 Thyssenkrupp Ag Kühler zum Kühlen von Klinker und Verfahren zum Betreiben eines Kühlers zum Kühlen von Klinker
CN111322413A (zh) * 2020-04-01 2020-06-23 河南龙成煤高效技术应用有限公司 一种回转窑密封系统和回转窑设备

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US2225283A (en) * 1937-11-04 1940-12-17 Voigtlaender Erich Otto Heat exchange apparatus
US2862808A (en) * 1957-07-31 1958-12-02 Alan N Mann Apparatus and method for reducing iron oxide pellets
GB831634A (en) * 1958-01-27 1960-03-30 Thomas Walter Plante Sinter treating apparatus and method
FR1459195A (fr) * 1965-10-05 1966-04-29 Produits Refractaires Procédé et dispositif de cuisson de produits réfractaires
US3589313A (en) * 1968-08-30 1971-06-29 Us Health Education & Welfare Solid waste disposal method and apparatus
US3584587A (en) * 1969-10-20 1971-06-15 Gianni Siracusa Garbage disposal system
BE795181A (fr) * 1972-02-23 1973-05-29 Thyssen Niederrhein Ag Agencement de collecte d'eponge de fer
US3831291A (en) * 1972-08-16 1974-08-27 Fuller Co Method and apparatus for treatment of particulate material
US4076493A (en) * 1976-09-09 1978-02-28 Kennedy Van Saun Corporation Apparatus for cooling particulate material
DE2657238C3 (de) * 1976-12-17 1982-05-06 Klöckner-Humboldt-Deutz AG, 5000 Köln Schachtofen mit gekühlten Hohlträgern im Ofeninnenraum
AU534230B2 (en) * 1979-04-23 1984-01-12 Hylsa S.A. Separation of insufficently cooled sponge iron pellets from those which have been adequately cooled
DE3123589A1 (de) * 1981-06-13 1983-01-13 Fried. Krupp Gmbh, 4300 Essen "vorrichtung zum abtrennen des im drehrohrofen erzeugten eisenschwammprodukts"
US4436551A (en) * 1981-10-26 1984-03-13 Sumitomo Heavy Industries, Ltd. Process for making steel from direct-reduced iron
DE3205366C2 (de) * 1982-02-16 1984-06-07 Deutsche Kommunal-Anlagen Miete GmbH, 8000 München Austragsvorrichtung für einen Drehrohrofen
US4629421A (en) * 1985-11-18 1986-12-16 Fuller Company Gas and solid particulate material heat exchanger

Also Published As

Publication number Publication date
AU578006B2 (en) 1988-10-06
EP0210658A1 (de) 1987-02-04
DE3527621A1 (de) 1987-02-05
IN164017B (es) 1988-12-31
AU6076286A (en) 1987-02-05
NZ216873A (en) 1989-02-24
US4680009A (en) 1987-07-14
ES2000811A6 (es) 1988-03-16
BR8603636A (pt) 1987-03-10
DE3661425D1 (en) 1989-01-19

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