CN1278870A - Device for withdrawing lumpy material - Google Patents
Device for withdrawing lumpy material Download PDFInfo
- Publication number
- CN1278870A CN1278870A CN98811081A CN98811081A CN1278870A CN 1278870 A CN1278870 A CN 1278870A CN 98811081 A CN98811081 A CN 98811081A CN 98811081 A CN98811081 A CN 98811081A CN 1278870 A CN1278870 A CN 1278870A
- Authority
- CN
- China
- Prior art keywords
- shaft furnace
- spiral conveyer
- axis
- spiral
- angle
- 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.)
- Pending
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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 peculiar to 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
Abstract
The invention relates to a device for withdrawing lumpy material, especially lumpy material containing iron oxide and/or sponge iron, from a shaft furnace, especially a direct reduction shaft furnace. The withdrawal device consists of worm conveyors which protrude into the shaft furnace over the floor of the same. A number of worm conveyors are aligned along axes. The projection of said axes onto the horizontal cross-sectional surface of the shaft furnace or the imaginary extensions of the projection of the axes forms secants of the horizontal cross-sectional surface of the shaft furnace. Said axes extend at a distance from the central point of the cross section of the furnace.
Description
The present invention relates to a kind of withdrawing lumpy material that is used for, especially in a shaft furnace, row unloads the device of the lumpy material that contains ferric oxide and/or sponge iron in the direct reduction shaft furnace in other words, and this row's handler comprises the spiral conveyer that stretches on the bottom of shaft furnace in the shaft furnace.
Row's handler of mentioned kind has various at present as everyone knows.Usually, they are used to from shaft furnace, for example withdrawing lumpy material in the direct reduction shaft furnace.Here said lumpy material is meant reductive sponge iron completely or partially, and according to degree of metallization, it also may contain the sub-fraction ferric oxide.
Use a kind of like this shaft furnace of arranging handler all to make cylindric hollow body usually, charging wherein is the lumpy material that contains ferric oxide and/or sponge iron, and the material that wherein will contain ferric oxide in case of necessity is with pack into the top of shaft furnace of additive such as Wingdale or rhombspar.By a plurality of holes that enter that in 1/3rd scopes of the bottom of shaft furnace, are arranged on the shaft furnace circumference a kind of reducing gas that is for example produced by melting gasifier is imported in the shaft furnace, therefore also just imported among the charge solids.In other words, the reducing gas that contains dust in case of necessity flows through charge solids upwards and make the ferric oxide in the charging fully or partly be reduced into sponge iron simultaneously.
Fully or the sponge iron that partly has been reduced just in shaft furnace, transport by the row's handler that is arranged in shaft furnace bottom top.This row's handler generally is designed to the spiral conveyer of radially (shaft furnace relatively) conveying of star-shaped arrangement, and the axis of spiral conveyer is positioned at a level cross-sectionn of shaft furnace.
The zone that is positioned at the shaft furnace bottom range at row's handler place should have maximum effective row and unload area, and pine dress material is descended as far as possible equably, has guaranteed also that on the other hand material continuously moves and mixes in reaction zone.
But the spiral conveyer of star-shaped arrangement has inherent defect, and this is owing to the loose subrange of adorning material in the spiral conveyer plane can not be covered by these handling machinerys; Thereby on these invalid areas, formed inactive zone with very steep stockpile angle, inside.It is invalid that the shortcoming in the outage zone of this being called as " dead angle " is exactly that partial volume in the reaction chamber becomes, and this moment, useful volume was meant that part in the shaft furnace that desirable gas one solid reaction takes place.Owing in a part of reaction volume of shaft furnace, formed a kind of intimate inactive charging, thereby this part reaction volume has just been lost also.
Because it is long that ore has reduced residence time of ore in other words, therefore may form in this scope and lump and agglomerate, they all have a negative impact to Flow of Goods and Materials, thereby have further reduced material again and changed and productivity.
Layout corresponding to this spiral conveyer of prior art is divided into two zones basically, has formed " dead angle " on these two zones.
These in two zones are the central sections, and it is only covered deficiently by the spiral conveyer of star-shaped arrangement and almost keeps motionless.Second zone is that the scope between per two adjacent spiral conveyers by wedge shape constitutes, the material pyramid of setting up on these dead bands hinders solids stream on the one hand, and upwards pile up always and expand, make the input slot of reactant gases covered, just formed air-locked relatively material owing in material, deposited dust so the part in the reaction gas like this by the material of packing into of this heap.This just causes not having required uniform gas distribution in shaft furnace.
Another shortcoming of arranging corresponding to this spiral conveyer of prior art is to aim at the load of the maximum possible that has caused shaft stool in the horizontal direction owing to the handling machinery axis.Typical shaft furnace has a for example radius of 3-4 rice in row's handler scope.At these is same long substantially, normally suspends, and that is to say that also bearing most on the spiral conveyer that is bearing in the shaft furnace circumference except the load of bearing its deadweight is positioned at the load that the shaft furnace inner height surpasses 20 meters the material of packing into.Because the load of supporting place of the feasible axle of disadvantageous leverage is very big, and these supportings are correspondingly very sensitive to disturbing.The result has caused carrying out frequent and expensive repairing.
Illustrated that in EP-B-0116679 being used to make solid particulate to be moved into arranges the spiral conveyer that draws off shaft furnace in other words.This is meant the spiral conveyer of the supporting that suspends of star-shaped arrangement, and their length separately is identical.Though the dead angle between adjacent spiral conveyer is reduced to minimum by the thing of packing into of wedge shape, can't stop the foundation at " dead angle " like this.Then do not add discussion by what the supporting of spiral conveyer produced about its susceptibility problem.
EP-B-0085290 discloses the layout of short taper profile spiral conveyer, and these handling machinerys not only are bearing in one and are positioned at the intermediary wedge shape and pack in the thing, also are bearing in the circumference of shaft furnace.Should stop " dead angle " that generates central authorities by this intermediary wedge shape thing of packing into that is positioned at.Wedge shape is arranged between adjacent separately spiral conveyer, the thing of packing into that upwards diminishes, so each spiral conveyer all is positioned at a kind of groove.
Certainly know that the thing of packing into that each in reduction shaft furnace is motionless is that the free transverse section of stove has been reduced with the viewpoint of loading material, they have promoted to form puts up a bridge, just sintering and the caking between the adjacent particle in the filling material.
On the other hand, directly above spiral conveyer, just owing to unloading, the row who is finished by spiral conveyer make the express parts of lowering speed of filling material form passage at those.Because being preferably in these passages, reducing gas flows, so in shaft furnace, just do not form required uniform gas distribution.
Therefore adopt the layout of any existing spiral conveyer and/or the thing of packing into all can not stop the material pyramid that in the middle of shaft furnace and between two adjacent separately spiral conveyers, is called as " dead angle " in the inner edge generation of shaft furnace, perhaps also just reduce its generation, be essentially uniform decline to reach the filling material.
By prior art, have only in spiral conveyer both circumference also at the intermediate support of shaft furnace at shaft furnace, can reduce in the spiral conveyer supporting too high stressed so.But like this, spiral conveyer just no longer can cover the central part of shaft furnace.
Therefore task of the present invention just provide a kind of in the shaft furnace device of withdrawing lumpy material, this device has been avoided some shortcomings of existing in the prior art.Especially should be in the middle of shaft furnace, between two adjacent separately spiral conveyers, avoid generating " dead angle " again at the inner edge of shaft furnace, reduce its generation in other words, feasible one side no longer makes the input slot of reducing gas be covered, and answers the basic of realization response material to descend uniformly in addition.Should reduce simultaneously stressed in the supporting of spiral conveyer axle as much as possible.
This task is by finishing by device of the present invention, this device is characterised in that, many spiral conveyers are along axis alignment, projection or the imaginary extended line of the projection of these the axis secant that formed shaft furnace horizontal slice of these axis on the horizontal slice of shaft furnace, these axis central point of leaving the shaft furnace transverse section has certain distance simultaneously.
Just stoped inner edge to generate the material pyramid effectively by these spiral conveyers of arranging by the present invention at shaft furnace.Therefore make reaction mass realize descending uniformly, and no longer occur ore in other words the reductive ore in shaft furnace, experience the various residence time.Reduced the load in the axle supporting base and significantly reduced the frequency of repairing by this layout in addition.
According to the present invention is to arrange spiral conveyer like this, make exactly its axis not with the centrally aligned of shaft furnace, pass through but just point to a certain extent on shaft furnace intermediary next door, short of other explanation, here said axis both had been meant the geometric center lines of spiral conveyer, also be meant the imaginary extended line of this line, until with the intersection point of the inner-wall surface of shaft furnace.The axis of spiral conveyer and vertical stove medullary ray by shaft furnace are not in one plane.
Another advantage of the present invention is exactly that these spiral conveyers that are not crooked layout on a plane have applied a torque for the material of packing into that is in the shaft furnace.These materials then unload and not only move downward under the effect of gravity owing to the row who is finished by spiral conveyer, and in the scope of the spiral conveyer of arranging in not being in same plane in shaft furnace the spiral motion of being essentially of material take place yet.
Because this additional spiralling has caused the mixing closely of the material of packing into, and has stoped formation sintering and passage effectively.
Axis to the standard pitch of shaft furnace medullary ray can be identical or different size for all handling machinerys in the planar spiral conveyer.Because spiral conveyer is not to arrange in one plane, thereby has dwindled the wedge shape scope between two adjacent spiral conveyers, may form the material pyramid at this above the scope.
According to another one feature of the present invention, the axis of spiral conveyer with respect to the horizontal plane makes progress or dips down and tiltedly arranges.
Axis and horizontal plane that preferred mode is a spiral conveyer form one≤70 ° angle, and especially paying the utmost attention to the inclination angle is 30 ° to 50 °.
On the one hand, its advantage is that spiral conveyer no longer bears the intensive bending load, but according to the direction that tilts not by bending load bear and draw or press.The material pyramid of extention has been eliminated.
All be arranged in two up and down in the eclipsed height section according to a kind of spiral conveyer of preferred form of implementation apparatus of the present invention, wherein the layout of the spiral conveyer of one section for example following one section level with a kind of known star itself.These spiral conveyers for example then tend to downwards by the present invention and to the side in second height section.
According to another form of implementation, two spiral conveyers that the height section has same quantity, wherein on being evenly distributed on the circumference of shaft furnace, arranges the reach through hole that is used for spiral conveyer on two of the shaft furnace height sections, and spiral conveyer at the reach through hole on the shaft furnace of upper height section with respect to the reach through hole on the lower height section in the angle of having arranged upper offset, this angle is not more than in a circumferential direction half of central angle between two adjacent reach through holes.
This layout combines spiral conveyer and is the advantage of star-shaped arrangement and is not advantage in conplane layout.The spiral conveyer of star-shaped arrangement is suitable for row and unloads from shaft furnace intermediary material, but has more known problems, can form the material pyramid at the inner edge place of shaft furnace exactly.On the contrary, be positioned at above it or spiral conveyer that following planar is not in one plane arranged but is suitable for reducing material pyramid at shaft furnace inner edge place, be suitable for stoping the formation of this pyramid in other words.
According to another form of implementation of apparatus of the present invention, two or more respectively at the spiral conveyer of the two-side supporting of shaft furnace circumference for being arranged in parallel and within a horizontal plane.Certainly adopt this spiral conveyer that is arranged in parallel to cover whole stove transverse section.Therefore one group of spiral conveyer is respectively arranged in the both sides that are preferably in parallel spiral conveyer, every group has two handling machinerys at least, the spiral conveyer axis of each group is such aligned, make them an intersection point be arranged exactly in certain distance of central point from the stove transverse section, and the intersection point of axis of each group spiral conveyer all is positioned at a half lining in stove transverse section, as this group spiral conveyer itself.
Therefore and pack into the even row of material of realization unloads adopt the spiral conveyer of design like this to arrange the transverse section that just may cover whole stove basically, and.
Below by device of the present invention being described in detail at accompanying drawing 1 to 3 represented embodiment:
Fig. 1: the shaft furnace sketch, spiral conveyer is in two height sections, and the spiral conveyer of upper height section is in tilted layout by the present invention.
Fig. 2: by the horizontal section of shaft furnace, the vertical view of spiral conveyer.
Fig. 3: another kind of form of implementation: the parallel spiral conveyer of perforation and respectively have a group every group to be three spiral conveyer in its both sides, vertical view.
Fig. 1 has represented a vertical section by shaft furnace with side-view, and the material 2 of packing into of lumpy material is arranged in shaft furnace inside, and this material is unloaded away by row in shaft furnace by the represented spiral conveyer 3,4 of sketch.Spiral conveyer 3,4 is arranged on two height sections 5,6, below the spiral conveyer 4 of height section 6 have a kind of known star-shaped arrangement, its axis is positioned at a plane.The spiral conveyer 3 of top height section 5 is inclined upwardly according to the present invention, and the axis of spiral conveyer 3 becomes an about angle [alpha] of 40 ° with level.
Fig. 2 has represented horizontal section by shaft furnace 1, the spiral conveyer 4 of the star-shaped arrangement of lower height section 6 as can be seen with vertical view.The axis of the spiral conveyer 3 of upper height section 5 with respect to the handling machinery axis of star-shaped arrangement to laterally inclined about angle beta of 20 °.The reach through hole 7 of the reach through hole 8 of spiral conveyer 3 in the shaft furnace 1 of upper height section 5 spiral conveyer 4 in the shaft furnace 1 of lower height section 6 angle of having setovered, it is roughly 1/3rd of central angle γ between two adjacent reach through holes, and this central angle γ is approximately 60 °.
Fig. 3 has represented another replacement form of implementation with vertical view, and wherein the parallel spiral conveyer 9 of three perforations is bearing in the both sides of the cylindrical shroud 10 of shaft furnace 1 respectively.Respectively there are one group 11,12 short spiral conveyers the both sides of the spiral conveyer 9 that is arranged in parallel, and its axis respectively has an intersection point, and the center of it and shaft furnace is separated by a distance.By the spiral conveyer 9,11,12 of this layout just guaranteed bulk material from 1 li of shaft furnace equably row unload out.
Claims (7)
1. be used for withdrawing lumpy material (2), especially from a shaft furnace (1) lining, in a direct reduction shaft furnace, arrange the device that unloads the lumpy material that contains ferric oxide and/or sponge iron in other words, wherein shaft furnace (1) is a hollow cylindrical body substantially, it has a basic horizontal slice for circle, and row's handler is designed to stretch into the spiral conveyer (3 in the shaft furnace above shaft furnace, 4), it is characterized in that, many spiral conveyers (3) are all along axis alignment, projection or the imaginary extended line of the projection of these the axis secant that formed shaft furnace (1) horizontal slice of these axis on the horizontal slice of shaft furnace (1), these axis central point of leaving the shaft furnace transverse section has certain distance simultaneously.
2. by the described device of claim 1, it is characterized in that the axis of a spiral conveyer (3) with respect to the horizontal plane is in tilted layout up or down.
3. by the described device of claim 2, it is characterized in that the axis of spiral conveyer (3) and the angle between the horizontal plane are not more than 70 °.
4. by the described device of claim 3, it is characterized in that the axis of spiral conveyer (3) and the angle between the horizontal plane are 30 °-50 °.
5. by each described device in the claim 1 to 4, it is characterized in that spiral conveyer (3,4) is arranged in two height sections (5 of arranging up and down, 6) lining, one of them height section (6) have a kind of horizontally disposed spiral conveyer (4) of known star own.
6. by the described device of claim 5, it is characterized in that, no matter be upper height section or lower height section (5,6) spiral conveyer (3,4) quantity is identical, therefore two height sections (5,6) shaft furnace (1) internal screw handling machinery (3,4) reach through hole (8,7) be on the circumference of shaft furnace (1), to distribute equably to arrange, and the reach through hole (8) of spiral conveyer (3) in the shaft furnace (1) of upper height section (5) be with respect to the angle of having setovered of the reach through hole (7) on the lower height section (6), and this angle is not more than in a circumferential direction half of central angle between two adjacent reach through holes.
7. by the described device of claim 1, it is characterized in that, two or more each arrange abreast and in a horizontal plane at the spiral conveyer (9) of right cylinder cover (10) upper support of shaft furnace (1), and one group of spiral conveyer (11 that is at least two respectively arranged respectively in the both sides of parallel spiral conveyer (9), 12), each group (11,12) the such aligned of spiral conveyer axis, make them an intersection point be arranged exactly in certain distance of central point from the stove transverse section, each organizes spiral conveyer (11, the intersection point of axis 12) all is positioned at a half lining in stove transverse section, as this group spiral conveyer itself.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0192297A AT405765B (en) | 1997-11-13 | 1997-11-13 | DEVICE FOR DISCHARGING PIECE OF GOODS |
| ATA1922/1997 | 1997-11-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1278870A true CN1278870A (en) | 2001-01-03 |
Family
ID=3523930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98811081A Pending CN1278870A (en) | 1997-11-13 | 1998-10-26 | Device for withdrawing lumpy material |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP1029087A1 (en) |
| JP (1) | JP2001523760A (en) |
| KR (1) | KR20010032033A (en) |
| CN (1) | CN1278870A (en) |
| AT (1) | AT405765B (en) |
| AU (1) | AU1336299A (en) |
| BR (1) | BR9814191A (en) |
| CA (1) | CA2310022A1 (en) |
| PL (1) | PL340566A1 (en) |
| TW (1) | TW393515B (en) |
| WO (1) | WO1999025881A1 (en) |
| ZA (1) | ZA9810206B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893371A (en) * | 2010-07-20 | 2010-11-24 | 中冶赛迪工程技术股份有限公司 | Material flow device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0019389B1 (en) * | 1979-05-09 | 1984-03-21 | Foster Wheeler Power Products Limited | Vertical pyrolysing furnace, more particularly for tyre pieces |
| AT372109B (en) * | 1982-01-11 | 1983-09-12 | Voest Alpine Ag | DEVICE FOR DISCHARGING HOT GOODS, ESPECIALLY IRON SPONGE FROM A CHAMBER |
-
1997
- 1997-11-13 AT AT0192297A patent/AT405765B/en not_active IP Right Cessation
-
1998
- 1998-10-26 AU AU13362/99A patent/AU1336299A/en not_active Abandoned
- 1998-10-26 CN CN98811081A patent/CN1278870A/en active Pending
- 1998-10-26 JP JP2000521243A patent/JP2001523760A/en not_active Withdrawn
- 1998-10-26 EP EP98956875A patent/EP1029087A1/en not_active Ceased
- 1998-10-26 BR BR9814191-0A patent/BR9814191A/en not_active Application Discontinuation
- 1998-10-26 KR KR1020007005152A patent/KR20010032033A/en not_active Application Discontinuation
- 1998-10-26 CA CA002310022A patent/CA2310022A1/en not_active Abandoned
- 1998-10-26 WO PCT/EP1998/006793 patent/WO1999025881A1/en not_active Application Discontinuation
- 1998-10-26 PL PL98340566A patent/PL340566A1/en unknown
- 1998-11-02 TW TW087118225A patent/TW393515B/en not_active IP Right Cessation
- 1998-11-09 ZA ZA9810206A patent/ZA9810206B/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893371A (en) * | 2010-07-20 | 2010-11-24 | 中冶赛迪工程技术股份有限公司 | Material flow device |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2310022A1 (en) | 1999-05-27 |
| PL340566A1 (en) | 2001-02-12 |
| ZA9810206B (en) | 1999-05-17 |
| KR20010032033A (en) | 2001-04-16 |
| AU1336299A (en) | 1999-06-07 |
| AT405765B (en) | 1999-11-25 |
| BR9814191A (en) | 2000-09-26 |
| WO1999025881A1 (en) | 1999-05-27 |
| EP1029087A1 (en) | 2000-08-23 |
| ATA192297A (en) | 1999-03-15 |
| JP2001523760A (en) | 2001-11-27 |
| TW393515B (en) | 2000-06-11 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |