WO1999025881A1 - Vorrichtung zum austragen von stückigem gut - Google Patents
Vorrichtung zum austragen von stückigem gut Download PDFInfo
- Publication number
- WO1999025881A1 WO1999025881A1 PCT/EP1998/006793 EP9806793W WO9925881A1 WO 1999025881 A1 WO1999025881 A1 WO 1999025881A1 EP 9806793 W EP9806793 W EP 9806793W WO 9925881 A1 WO9925881 A1 WO 9925881A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft furnace
- screw conveyors
- axes
- furnace
- horizontal
- 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.)
- Ceased
Links
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
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
- F27B1/21—Arrangements of devices for discharging
-
- 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
- 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
- F27D3/08—Screw feeders; Screw dischargers
Definitions
- the invention relates to a device for discharging lumpy material, in particular iron oxide and / or sponge-containing lumpy material from a shaft furnace, in particular a direct reduction shaft furnace, the discharge device consisting of screw conveyors projecting into the shaft furnace from the bottom of the shaft furnace.
- Discharge devices of the type described above are widely known from the prior art. They are usually used to discharge lumpy material from a shaft furnace, for example a direct reduction shaft furnace. Lumpy material is to be understood here to mean completely or partially reduced sponge iron, which, depending on the degree of metallization, can still contain a small proportion of iron oxide.
- a shaft furnace in which such a discharge device is used, is usually designed as a substantially cylindrical hollow body and contains a bed of lumpy material containing iron oxide and / or sponge iron, material containing iron oxide optionally together with additives such as lime or dolomite in the upper one Part of the shaft furnace is abandoned.
- a reducing gas originating, for example, from a melter gasifier is blown into the shaft furnace and thus into the solid bed.
- the hot, possibly dust-laden reducing gas flows upwards through the solid bed and thereby reduces all or part of the iron oxide of the bed to sponge iron.
- the fully or partially reduced iron sponge is conveyed out of the shaft furnace by the discharge device arranged above the bottom of the shaft furnace.
- This discharge device is generally designed as a star-shaped arrangement of conveying screws which convey radially (with reference to the shaft furnace), the axes of the screw conveyors lying in a horizontal cross-sectional plane of the shaft furnace.
- the zone in the area of the shaft floor, in which the discharge device is located should have a maximum of active discharge area in order on the one hand to achieve the most uniform possible lowering of the bulk material, and furthermore a continuous movement and mixing of the material in the reaction zone should be ensured .
- the star-shaped arrangement of the screw conveyors entails disadvantages which are due to the fact that, since parts of the bulk material cannot be grasped by the screw conveyor in the plane of the screw conveyor, immobile zones with very steep internal bed angles are formed over these inactive surfaces.
- this is the central area, which is not adequately grasped by the star-shaped screw conveyors and remains almost stationary.
- the second zone is formed by the wedge-shaped areas between two adjacent screw conveyors, whereby the bed pyramids built up over these dead zones on the one hand inhibit the flow of solids and also build up so far that the gas inflow slots for the reducing gas are covered by the bed material being built up are, whereby a relatively gas-impermeable bed is formed locally by the dust load of the reducing gas deposited in the bed material. As a result, the necessary homogeneous gas distribution in the shaft furnace is omitted.
- a typical shaft furnace has a radius of, for example, three to four meters in the area of the discharge device.
- flying ie in the circumference of the shaft conveyor screw conveyors are loaded in addition to their own weight large part of the bed in the shaft furnace with a height of more than 20 meters.
- the load on the bearings of the axles is enormous due to the unfavorable leverage effect and the bearings are therefore prone to failure. Frequent and expensive repairs are the result.
- EP-B-0 116 679 describes screw conveyors for moving and discharging solid particles in or from a shaft furnace. These are star-shaped, cantilevered snails, each of the same length. The blind spots between neighboring snails are minimized by wedge-shaped fittings, but the build-up of "dead men" cannot be prevented. The problem arising from the storage of the screw conveyor with regard to its susceptibility to failure is not dealt with.
- EP-B-0 085 290 discloses arrangements of short conical screws, which are mounted both in a conical installation located in the middle and in the circumference of the shaft furnace. The formation of the central "dead man” is to be prevented by the conical installation in the middle. There are wedge-shaped internally tapered internals between each adjacent screw conveyor, so that each screw conveyor lies in a kind of channel.
- any type of immovable internals in a reduction shaft furnace which, from the point of view of the bulk material, represent a reduction in the free furnace cross section, the bridging, i.e. a partial sintering and caking of neighboring particles within the bulk material promotes.
- channels can form directly above the screw conveyors, that is to say in areas in which the rate of lowering of the bulk material is particularly high due to the discharge produced by the screw conveyors. Since the reducing gas flows preferentially in these channels, the necessary homogeneous gas distribution in the shaft furnace is no longer provided.
- Screw conveyors and / or internals possible the formation of pyramids known as "dead man" in the middle of the shaft furnace, as well as between two to prevent adjacent screw conveyors on the inner edge of the shaft furnace or only to reduce them to such an extent that a largely uniform lowering of the bulk material is achieved.
- the excessive stress on the storage of the conveyor screws can only be reduced if the conveyor screws are mounted both in the circumference and in the center of the shaft furnace.
- the object of the present invention is therefore to provide a device for discharging lumpy goods from a shaft furnace, which avoids the disadvantages of the prior art.
- the formation of "dead men" both in the middle of the shaft furnace and between two adjacent screw conveyors on the inner edge of the shaft furnace should be avoided or reduced to such an extent that on the one hand the gas inflow slots for the reducing gas are no longer covered, and a largely uniform lowering of the reaction material can be achieved.
- the stress on the bearings of the axes of the screw conveyors should be reduced as much as possible.
- the device according to the invention which is characterized in that a number of screw conveyors are aligned along axes, the projection of which on the horizontal cross-sectional area of the shaft furnace or the imaginary extensions of the projection of these axes form secants of the horizontal cross-sectional surface of the shaft furnace, whereby these axes are at a distance from the center of the furnace cross section.
- the screw conveyors are arranged according to the invention so that the axes are not aligned with the center of the shaft furnace, but to a certain extent at the center of the Point the shaft furnace past, whereby, unless otherwise stated, the axis here means both the geometric center line of a screw conveyor and the imaginary extension of this line to the point of intersection with the inner surface of the shaft furnace.
- the axis of the screw conveyor is therefore skewed to the center line of the shaft furnace, which runs perpendicularly through the shaft furnace.
- Another advantage of the invention is that the skewed conveyor screws exert a torque on the bed material located in the shaft furnace.
- the bulk material therefore not only moves downwards under the influence of gravity due to the discharge produced by the screw conveyors, but also an essentially spiral movement of the bulk material takes place in the region of the skewed conveyor screws within the shaft furnace.
- the normal distance between the axis and the center line of the shaft furnace can be the same or different in size for all screw conveyors on a plane of screw conveyors. This skewed arrangement of the screw conveyors reduces the wedge-shaped area between two adjacent screw conveyors over which the pyramids can be built.
- the axes of the screw conveyors are arranged inclined upwards or downwards with respect to the horizontal.
- the axes of the screw conveyors preferably form an angle of up to 70 ° with the horizontal, an angle of inclination of 30 ° to 50 ° being particularly preferred.
- the screw conveyors of the device according to the invention are arranged in two superimposed height sections, one of the Sections, for example the lower one, has a known star-shaped, horizontal arrangement of the screw conveyors.
- the screw conveyors are inclined according to the invention, for example downwards and to the side.
- both height sections have an equal number of screw conveyors, the passage openings for the screw conveyors in the shaft furnace of both height sections being arranged uniformly distributed over the circumference of the shaft furnace, and the passage openings of the screw conveyors in the shaft furnace of the upper height section against the passage openings of the lower height section are offset by up to half the central angle between two adjacent passage openings in the circumferential direction.
- This arrangement combines the advantages of both star-shaped and skewed arrangement of screw conveyors.
- a star-shaped arrangement of screw conveyors is suitable for discharging material from the center of the shaft furnace, but has the known problems with respect to the pyramids at the inner edge of the shaft furnace.
- a level of worm conveyors arranged skewed above or below is suitable for dismantling these pyramids at the inner edge of the shaft furnace or preventing their formation.
- two or more screw conveyors mounted on both sides in the circumference of the shaft furnace are arranged in parallel and in a horizontal plane.
- a group of at least two screw conveyors is therefore preferably provided on both sides of the parallel screw conveyors, the axes of the screw conveyors of each group being aligned such that they have an intersection at a distance from the center of the furnace cross section and the intersection of the axes is in each case a group of screw conveyors is located in the same half of the furnace cross section as the screw conveyors of the group itself.
- Fig. 1 schematic shaft furnace, screw conveyors in two height sections, wherein the screw conveyors of the upper height section are inclined according to the invention.
- Fig. 2 horizontal section through shaft furnace, top view of screw conveyors
- Fig. 3 alternative embodiment: combination of continuous, parallel screws with a group of three conveyor screws on both sides of the parallel screws, plan view.
- Fig. 1 shows a side view of a vertical section through a shaft furnace 1, in the interior of which there is a bed 2 of lumpy material which is discharged from the shaft furnace by means of schematically illustrated screw conveyors 3, 4.
- the screw conveyors 3, 4 are arranged in two height sections 5, 6, the screw conveyors 4 of the lower height section 6 having a known star-shaped arrangement, that is to say their axes lie in one plane.
- the screw conveyors 3 of the upper height section 5 are inclined upwards, namely the axes of the screw conveyors 3 form an angle ⁇ of approximately 40 ° with the horizontal.
- FIG. 2 shows a top view of a horizontal section through the shaft furnace 1, the star-shaped arrangement of the screw conveyors 4 of the lower height section 6 being recognizable.
- the axes of the screw conveyors 3 of the upper height section 5 are inclined to the side relative to those of a star-shaped arrangement by an angle ⁇ of approximately 20 °.
- the passage openings 8 of the screw conveyors 3 in the shaft furnace 1 of the upper height section 5 are offset from the passage openings 7 of the screw conveyors 4 in the shaft furnace 1 of the lower height section 6 by approximately one third of the central angle ⁇ between two adjacent passage openings, which is approximately 60 °.
- FIG. 3 shows an alternative embodiment in plan view, in which three continuous, parallel screw conveyors 9 are each mounted on both sides in the cylinder jacket 10 of the shaft furnace 1.
- a group 11, 12 of shorter conveyor screws is provided, the axes of which each have an intersection that is spaced from the center of the shaft furnace.
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)
- Furnace Charging Or Discharging (AREA)
- Screw Conveyors (AREA)
- Manufacture Of Iron (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
Description
Claims
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR9814191-0A BR9814191A (pt) | 1997-11-13 | 1998-10-26 | Arranjo para descarregar material em grumos |
| CA002310022A CA2310022A1 (en) | 1997-11-13 | 1998-10-26 | Device for withdrawing lumpy material |
| KR1020007005152A KR20010032033A (ko) | 1997-11-13 | 1998-10-26 | 럼프 배출장치 |
| JP2000521243A JP2001523760A (ja) | 1997-11-13 | 1998-10-26 | 塊状材料放出装置 |
| AU13362/99A AU1336299A (en) | 1997-11-13 | 1998-10-26 | Device for withdrawing lumpy material |
| PL98340566A PL340566A1 (en) | 1997-11-13 | 1998-10-26 | Apparatus for discharging a material dismembered into pieces |
| EP98956875A EP1029087A1 (de) | 1997-11-13 | 1998-10-26 | Vorrichtung zum austragen von stückigem gut |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0192297A AT405765B (de) | 1997-11-13 | 1997-11-13 | Vorrichtung zum austragen von stückigem gut |
| ATA1922/97 | 1997-11-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999025881A1 true WO1999025881A1 (de) | 1999-05-27 |
Family
ID=3523930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1998/006793 Ceased WO1999025881A1 (de) | 1997-11-13 | 1998-10-26 | Vorrichtung zum austragen von stückigem gut |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP1029087A1 (de) |
| JP (1) | JP2001523760A (de) |
| KR (1) | KR20010032033A (de) |
| CN (1) | CN1278870A (de) |
| AT (1) | AT405765B (de) |
| AU (1) | AU1336299A (de) |
| BR (1) | BR9814191A (de) |
| CA (1) | CA2310022A1 (de) |
| PL (1) | PL340566A1 (de) |
| TW (1) | TW393515B (de) |
| WO (1) | WO1999025881A1 (de) |
| ZA (1) | ZA9810206B (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893371B (zh) * | 2010-07-20 | 2011-12-07 | 中冶赛迪工程技术股份有限公司 | 一种料流装置 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0019389A1 (de) * | 1979-05-09 | 1980-11-26 | Foster Wheeler Power Products Limited | Senkrechter Pyrolyseofen, insbesondere für zerkleinertes Reifenmaterial |
| EP0085290A1 (de) * | 1982-01-11 | 1983-08-10 | VOEST-ALPINE Aktiengesellschaft | Vorrichtung zum Austragen von heissem Gut, insbesondere von Eisenschwamm aus einem Schachtofen |
-
1997
- 1997-11-13 AT AT0192297A patent/AT405765B/de not_active IP Right Cessation
-
1998
- 1998-10-26 KR KR1020007005152A patent/KR20010032033A/ko not_active Withdrawn
- 1998-10-26 CA CA002310022A patent/CA2310022A1/en not_active Abandoned
- 1998-10-26 CN CN98811081A patent/CN1278870A/zh active Pending
- 1998-10-26 BR BR9814191-0A patent/BR9814191A/pt not_active Application Discontinuation
- 1998-10-26 AU AU13362/99A patent/AU1336299A/en not_active Abandoned
- 1998-10-26 EP EP98956875A patent/EP1029087A1/de not_active Ceased
- 1998-10-26 WO PCT/EP1998/006793 patent/WO1999025881A1/de not_active Ceased
- 1998-10-26 PL PL98340566A patent/PL340566A1/xx unknown
- 1998-10-26 JP JP2000521243A patent/JP2001523760A/ja not_active Withdrawn
- 1998-11-02 TW TW087118225A patent/TW393515B/zh not_active IP Right Cessation
- 1998-11-09 ZA ZA9810206A patent/ZA9810206B/xx unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0019389A1 (de) * | 1979-05-09 | 1980-11-26 | Foster Wheeler Power Products Limited | Senkrechter Pyrolyseofen, insbesondere für zerkleinertes Reifenmaterial |
| EP0085290A1 (de) * | 1982-01-11 | 1983-08-10 | VOEST-ALPINE Aktiengesellschaft | Vorrichtung zum Austragen von heissem Gut, insbesondere von Eisenschwamm aus einem Schachtofen |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2310022A1 (en) | 1999-05-27 |
| JP2001523760A (ja) | 2001-11-27 |
| KR20010032033A (ko) | 2001-04-16 |
| TW393515B (en) | 2000-06-11 |
| PL340566A1 (en) | 2001-02-12 |
| AT405765B (de) | 1999-11-25 |
| AU1336299A (en) | 1999-06-07 |
| EP1029087A1 (de) | 2000-08-23 |
| ZA9810206B (en) | 1999-05-17 |
| CN1278870A (zh) | 2001-01-03 |
| BR9814191A (pt) | 2000-09-26 |
| ATA192297A (de) | 1999-03-15 |
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