EP0516613B1 - Anlage mit einem Schacht, insbesondere Reduktionsschachtofen - Google Patents

Anlage mit einem Schacht, insbesondere Reduktionsschachtofen Download PDF

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Publication number
EP0516613B1
EP0516613B1 EP92890127A EP92890127A EP0516613B1 EP 0516613 B1 EP0516613 B1 EP 0516613B1 EP 92890127 A EP92890127 A EP 92890127A EP 92890127 A EP92890127 A EP 92890127A EP 0516613 B1 EP0516613 B1 EP 0516613B1
Authority
EP
European Patent Office
Prior art keywords
shaft
bulk material
plant according
charging
temperature measuring
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
EP92890127A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0516613A1 (de
Inventor
Leopold Werner Dr. Dipl.-Ing Kepplinger
Wilhelm Schiffer
Wilhelm Stastny
Bernhard Rinner
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.)
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 EP0516613A1 publication Critical patent/EP0516613A1/de
Application granted granted Critical
Publication of EP0516613B1 publication Critical patent/EP0516613B1/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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden

Definitions

  • the invention relates to a system according to the preamble of claim 1.
  • the loading device is formed by a plurality of pipes rigidly arranged with respect to the shaft, through which the bulk material enters the shaft to form a plurality of bulk material cones, the respective tips of which are always at the same height at the mouth of the associated pipe.
  • the continuous feeding of the bulk material offers the advantage of constant temperature in the upper end region of the shaft, which is not the case when the bulk material is introduced discontinuously, for example in a blast furnace with a charging device designed as a rotary chute, because it is batch-wise and generally cold bulk material, there is a sudden drop in gas temperature.
  • a disadvantage of the known continuous loading devices is that the fine-grain portion of the bulk material of the bulk material is segregated on the bulk material cone, since the coarse-grain portion rolls further on the surface of the bulk material cone than the fine-particle bulk material. This leads to an uneven gasification of the bulk material and, in the case of direct reduction of iron ore, to an unequal degree of reduction, this inequality being exacerbated by the fact that the gases have a higher temperature at points of a higher gasification rate.
  • V-fill (known from DE-31 41 280 A)
  • M-fill (known from DE-38 34 969 A) or A-fill
  • the coarser particles run to the edge, the finer ones remain more in the middle.
  • the gas flow is again pushed to the edge, because firstly the specific resistance of a coarse-grained bed is lower and secondly the path to the bed surface is shorter.
  • a system in which the bulk material is conveyed into the interior of the shaft with a constant feeding speed with the aid of a loading device designed as a conveyor belt, the loading device having a horizontally movable carriage so that the loading material can be moved to different locations Setting the shaft cross section can be introduced.
  • the gas temperatures can be measured by means of a thermocouple, which is arranged on the carriage approximately at the point at which the feed material is thrown off, and depending on the same, the feed speed of the feed device can be regulated in such a way that the material is dispensed at locations of relatively high permeability increased and the material output is reduced via places of relatively low permeability.
  • a disadvantage here is the relatively complicated loading device, especially for a shaft with high gas temperatures. It is also disadvantageous that the temperature measuring device is moved with the conveyor belt over the cross section of the shaft, so that only the temperature at one point, namely at the discharge point of the load, can be determined. As a result, it is not possible to determine and correct deviations in the temperature distribution over the entire shaft cross section.
  • FR-1 406 976 A shows a system with a loading device, in which a loading pipe is rotatably mounted at the upper end of the furnace.
  • This feed pipe is angled in the lower section, and it widens towards the lower mouth so that it can cover almost half the diameter of the furnace.
  • this feed pipe contains a partition and a flap above it, in order to be able to distribute the feed material over one or the other subchannel, i.e. either feed more radially outside or more radially inside the furnace.
  • three transmitter devices are also provided to record the temperature, pressure and gas composition on different radii (inside, center and outside). These donor devices are installed inside the feed pipe, where the bulk material flow is fed; In addition, a temperature, pressure and gas composition measurement is always carried out at the respective point on the rotating feed pipe.
  • a generic system in the form of a shaft furnace is known from US-4 178 151 A.
  • a plurality of outlet pipes for the formation of pouring cones is provided within the upper part of the shaft, these pipes being arranged in a stationary manner and at a regular distance from one another and at a distance from the furnace wall.
  • the muzzle pipes are connected to feed pipes that start from a loading funnel.
  • Each muzzle tube is assigned temperature measuring devices in the form of measuring points with thermocouples, which are attached to the furnace wall below the muzzle tubes and are intended to lie within the bulk material during operation. If the temperature rises sharply at a measuring point, the operator is signaled that there is insufficient bulk material in the muzzle pipes in question. Devices for the individual metering of the quantity of bulk material to the individual outlet pipes are not provided. Due to the rigid arrangement of the muzzle pipes, the bulk material cones are always formed in the same places.
  • the invention aims at avoiding the disadvantages and difficulties described and has as its object to create a system of the type described at the outset, which has a uniform treatment of the bulk material, i.e. ensures uniform gas flow across the entire cross-section of the shaft with little design effort and high operational reliability.
  • 1 designates an upper part of a refractory-lined, essentially cylindrical shaft 2 of a direct reduction shaft furnace, in which lumpy bulk material continuously charged from above, namely iron ore 3, is reduced by means of the reducing gas flowing through the shaft 2 from bottom to top.
  • the reduction gas is introduced in this reduction process in the usual way through feed lines arranged at the lower third of the height of the shaft 2 on its casing 4.
  • the loading of the shaft with the iron-containing bulk material 3 takes place via a loading device 5 which, according to the embodiment shown in FIG. 1, has a collecting container 6 which is arranged centrally to the shaft 2 and lies above the shaft 2. From the collecting container 6, which is fed continuously or discontinuously from above through a central opening 7, six feed pipes 9 are arranged, which are evenly distributed around the longitudinal axis 8 of the shaft and which open through the ceiling 10 of the shaft 2 into the interior 11 thereof.
  • tubular mouth pieces 13 are articulated, the articulation being such that the mouth pieces 13 can be pivoted in the radial direction as seen from the longitudinal axis 8 of the shaft 2.
  • the upper end 14 of each substantially straight and cylindrical mouthpiece 13 is funnel-shaped to protrude in each of the pivot positions of the mouthpieces 13 over the lower end 12 of the associated feed pipe 9, so that all bulk material 3 sinking through the feed pipes 9 by the subordinate ones Mouthpieces 13 flows and forms a bulk material cone 16 adjoining the lower opening 15, which is also of an enlarged design.
  • a gas discharge opening 24 is provided on the side of the mouths of the feed pipes 9.
  • thermocouples 25 are provided in a cross-sectional plane Q of the shaft 2, which are preferably designed as thermocouples. These thermocouples 25 are arranged in the interior of steel tubes 26 which extend radially across the cross section of the shaft 2 and in which the electrical connecting lines 27 are also guided. The steel tubes 26 protrude through the jacket 4 of the shaft 2 to the outside.
  • the electrical connecting lines 27, which are led to the outside via the steel pipes 26, are connected to a computing and control unit (not shown), which in turn is coupled to the actuating cylinder 18 for adjusting the position of the mouth pieces 13 in the manner described below.
  • the bulk material In the case of a stationary pouring of the bulk material 3 in the interior 11 of the shaft 2, the bulk material is segregated, since the bulk of the bulk material 3 on the bulk material cone 16 rolls further outwards. As a result, the finer bulk material 3 collects in the center of the bulk material cone, i.e. where the bulk material cone 16 has its greatest height and thus the longest gas passage path, so that, in addition to the longest gas passage path, a gas permeability which is lower than the edge zones of a bulk material cone 16 occurs. This causes an uneven gasification and thus an uneven degree of reduction of the ore.
  • the gas emerging from the bulk material 3 has a higher temperature, so that on the basis of the temperature values measured in a cross-sectional plane Q, the duration of the treatment can be concluded from the gas flowing through the bulk material below the temperature measuring device 25.
  • the measured temperature values deviate from a temperature value to a certain extent, the introduction of the bulk material 3 is changed such that the position of the bulk material cone 16 is displaced, namely in the radial direction according to the embodiment shown in FIGS.
  • the charging device 5 has both a central charging pipe 9 'and charging pipes 9 lying radially at a certain distance therefrom.
  • All loading tubes 9, 9 ' are each provided with a telescopic over the loading tube 9, 9' slidable and fixable in different sliding positions mouthpiece 13 ', which makes it possible to bring the outlet openings 15 of the loading device 5 to different heights.
  • peaks 17 of the bulk material cone 16 lying at different heights result, but also different types of fill, such as an A fill, which is shown in the left half of FIG. 3, or a V fill, which is in the right Image half of Fig. 3 is shown.
  • FIG. 4 also enables a V-bed and an A-bed to be varied, the illustration being analogous to that of FIG. 3.
  • a slide 28 is provided in the vertical direction, which can be shifted in different positions and can be fixed in these positions and is designed as a cylinder.
  • the radially outer mouth pieces 13 In the raised position, the radially outer mouth pieces 13 graduallyen, which are formed in one piece with the loading pipes 9, 9 ⁇ , closes and, in the lowered position, blocks the centrally arranged mouthpiece 13 ⁇ with the aid of a conical insert 29 arranged centrally in the interior thereof.
  • the pivotability of the mouthpieces 13 is such that a pure A-bed can be achieved if the mouthpieces 13 inwards to Longitudinal axis 8 of the shaft 2 are pivoted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture Of Iron (AREA)
  • Control Of Turbines (AREA)
EP92890127A 1991-05-29 1992-05-26 Anlage mit einem Schacht, insbesondere Reduktionsschachtofen Expired - Lifetime EP0516613B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1094/91 1991-05-29
AT0109491A AT396482B (de) 1991-05-29 1991-05-29 Anlage mit einem schacht, insbesondere reduktionsschachtofen

Publications (2)

Publication Number Publication Date
EP0516613A1 EP0516613A1 (de) 1992-12-02
EP0516613B1 true EP0516613B1 (de) 1996-07-03

Family

ID=3506460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92890127A Expired - Lifetime EP0516613B1 (de) 1991-05-29 1992-05-26 Anlage mit einem Schacht, insbesondere Reduktionsschachtofen

Country Status (10)

Country Link
US (1) US5271609A (cs)
EP (1) EP0516613B1 (cs)
JP (1) JPH0672248B2 (cs)
KR (1) KR960002482B1 (cs)
AT (1) AT396482B (cs)
AU (1) AU649829B2 (cs)
CA (1) CA2069859C (cs)
DE (1) DE59206689D1 (cs)
TW (1) TW206985B (cs)
ZA (1) ZA923952B (cs)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1315147B1 (it) * 2000-11-14 2003-02-03 Danieli Off Mecc Forno per la riduzione diretta di ossidi di ferro
AT502479B1 (de) * 2005-10-24 2007-04-15 Voest Alpine Ind Anlagen Verfahren und vorrichtung zum chargieren von einsatzstoffen
KR100880773B1 (ko) 2008-01-23 2009-02-02 (주) 씨엠테크 유체 가열장치
KR20220154452A (ko) 2021-05-13 2022-11-22 현대자동차주식회사 원료분말용 호퍼 및 이를 이용한 원료분말 이송방법

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1151822B (de) * 1959-06-23 1963-07-25 United States Steel Corp Verfahren und Geraet zum UEberwachen der Beschickung eines Schachtofens
DE1205997B (de) * 1963-01-05 1965-12-02 Demag Ag UEberwachungsvorrichtung fuer Hochoefen
DE1230052B (de) * 1963-09-16 1966-12-08 Kloeckner Werke Ag Verfahren und Vorrichtung zur kontinuierlichen Kontrolle der Durchgasung der Hochofen-Schachtbeschickung
FR1406976A (fr) * 1964-09-08 1965-07-23 Demag Ag Procédé et dispositifs de chargements complémentaires pour haut fourneau
DE1907224A1 (de) * 1969-02-13 1970-09-03 Demag Ag Vorrichtung zum Verteilen von Beschickungsgut in Schachtoefen
GB1491519A (en) * 1973-12-26 1977-11-09 Midrex Corp Apparatus for feeding dissimilarly sized particles into a shaft furnace
JPS6032793B2 (ja) * 1978-02-03 1985-07-30 石川島播磨重工業株式会社 炉頂装入装置
JPS5934764B2 (ja) * 1978-02-07 1984-08-24 石川島播磨重工業株式会社 シヤフト炉
US4178151A (en) * 1978-03-02 1979-12-11 Midrex Corporation Apparatus for monitoring the feeding of particulate materials to a packed bed furnace
JPS54128905A (en) * 1978-03-31 1979-10-05 Nippon Kokan Kk <Nkk> Charging apparatus for raw material to blast furnace top
SE441865B (sv) * 1981-03-10 1985-11-11 Skf Steel Eng Ab Anordning for att uppifran tillfora styckeformigt material till ett schakt
US4913406A (en) * 1986-08-26 1990-04-03 Kawasaki Steel Corp. Shaft furnace having means for charging and adjusting a pre-mixture of ore and coke
LU87341A1 (fr) * 1988-09-22 1990-04-06 Wurth Paul Sa Installation de chargement d'un four a cuve
DE3834969A1 (de) * 1988-10-13 1990-04-19 Kortec Ag Beschickungseinrichtung fuer schachtoefen, insbesondere hochoefen

Also Published As

Publication number Publication date
KR960002482B1 (en) 1996-02-17
TW206985B (cs) 1993-06-01
US5271609A (en) 1993-12-21
AU649829B2 (en) 1994-06-02
KR920021719A (ko) 1992-12-18
AT396482B (de) 1993-09-27
ZA923952B (en) 1993-02-24
JPH05148522A (ja) 1993-06-15
CA2069859C (en) 1997-02-25
DE59206689D1 (de) 1996-08-08
CA2069859A1 (en) 1992-11-30
JPH0672248B2 (ja) 1994-09-14
AU1719692A (en) 1992-12-17
EP0516613A1 (de) 1992-12-02
ATA109491A (de) 1993-01-15

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