EP0985122B1 - Chargiervorrichtung für einen drehherdofen - Google Patents
Chargiervorrichtung für einen drehherdofen Download PDFInfo
- Publication number
- EP0985122B1 EP0985122B1 EP98929303A EP98929303A EP0985122B1 EP 0985122 B1 EP0985122 B1 EP 0985122B1 EP 98929303 A EP98929303 A EP 98929303A EP 98929303 A EP98929303 A EP 98929303A EP 0985122 B1 EP0985122 B1 EP 0985122B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge
- rotary hearth
- hearth furnace
- furnace according
- bunker
- 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
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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
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
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- 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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
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- 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
-
- 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
- F27D3/0033—Charging; Discharging; Manipulation of charge charging of particulate material
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- 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
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- 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
- F27D3/10—Charging directly from hoppers or shoots
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- 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
- F27D2003/0001—Positioning the charge
- F27D2003/0006—Particulate materials
- F27D2003/0008—Longitudinal distribution
-
- 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
- F27D2003/0001—Positioning the charge
- F27D2003/0006—Particulate materials
- F27D2003/001—Series of dispensers or separation in teo or more parts
Definitions
- the present invention relates to a rotary hearth furnace with a charging device for the application of a new direct reduction process from iron ore.
- the production of sponge iron takes place in a direct reduction process by reducing iron oxide with solid or gaseous reducing agents.
- Carbon for example, serves as a solid reducing agent at higher temperatures reacts with oxygen around the reducing gas CO to build.
- Such a process can, for example, in a rotary hearth furnace be carried out, i.e. in an oven with a rotatable annular Oven bottom, which is covered with fireproof material on the top and surrounded by an enclosure.
- Burner At the top of the enclosure are Burner attached, which penetrate the housing and the inside of the Enclosure to the required reaction temperature of over 1000 ° C Warm up.
- the iron oxide is together with the reducing agent in a first place of the rotary hearth furnace applied to the rotary hearth and passes through the Rotation of the lathe in the interior of the housing, where it is due to the reacted at high temperatures with the reducing agent, after about one Rotation of the lathe as a directly reduced iron.
- Form Under which the iron is present depends on the type of process used from.
- the iron oxide is loaded into the Rotary hearth furnace pressed together with the reducing agent to pellets, which then be charged to the oven's rotary hearth. Internally The iron oxide inside the furnace reacts in a controlled atmosphere of the individual pellets with the carbon monoxide released from the carbon and is reduced to iron within the pellets.
- the sponge iron lies thus after the reduction in pellet form before, the pellets also the Residues of the reducing agent (ashes) and any impurities such as. Contain sulfur. After the reduction process is therefore a a further process step is necessary in which the directly reduced iron of the ashes and contaminants are separated.
- fine-grained iron oxide and fine-grained Reducing agents in separate layers on the rotary hearth of the Furnace charged. It is possible to only use one layer at a time Charging iron oxide and a layer with reducing agent or it can several layers of the individual materials alternately layered on top of each other become.
- Charging iron oxide and a layer with reducing agent or it can several layers of the individual materials alternately layered on top of each other become.
- the Carbon layers released carbon monoxide by the fine-grained Iron oxide layers penetrate and reduce them to iron.
- the reduced iron is therefore in pure form after the reduction process in one or more superimposed layers, the individual iron layers are separated from one another by layers of reducing agent residues and these layers of ash are in bulk.
- this method offers the advantage that the Sponge iron and the residues of the reducing agent slightly apart let separate.
- the basic requirement for an economic implementation this reduction method is that the charging device of Rotary hearth furnace is capable of optimal stratification of the metal oxide and To produce reducing agents on the rotary hearth.
- a task of the present The invention is therefore to provide a rotary hearth furnace, the charging device this requirement is largely met.
- Charging devices that have a single discharge hopper with an outlet slot and comprise a discharge roller upstream of the discharge slot already known from DE 2814494. They are in sinter plants with moving rust, to create a loose, even layer of a sinter mixture used on the traveling grate. The generation of superimposed Layers are not dealt with in DE 2814494.
- the charging device one discharge bunker per metal oxide or reducing agent layer, with a discharge slot, and one upstream of the discharge slot Discharge roller on.
- the outlet slot and discharge roller extend in the essentially transversely to the direction of rotation of the lathe, and the discharge rollers have a speed-controlled drive.
- the rotation speed a discharge roller increases, the bulk material discharge increases from the corresponding Discharge bunker.
- the rotation speed of a discharge roller however, the bulk material discharge from the corresponding one is reduced Discharge bunker.
- Discharge rollers each have a guide profile arranged so that the roll falling bulk material falls on the guide profile and braked on by the guide profile the top layer is routed.
- the invention Device to have only continuous weighing devices that are installed in the charging device such that the bulk material discharge the metal oxides and reducing agents can be recorded gravimetrically.
- a speed control for the speed-controlled drives of the discharge rollers controls in in this case the speed of the discharge rollers as a function of the corresponding one gravimetric measurements of the weighing devices.
- the discharge bunkers are for the metal oxide, or for the reducing agent to a storage bunker for the Metal oxide, or connected for the reducing agent, but in are movable in the vertical direction relative to the respective storage bunker, and are suspended above the rotary hearth by means of weight measuring cells.
- the bulk material discharge can be carried out separately from each discharge bunker be detected so that the structure of each individual layer is gravimetric can be controlled.
- the entire bulk material discharge from the storage bunker for the metal oxide and the storage bunker for the reducing agent separately gravimetrically can be detected so that the overall structure of the metal oxide layers and The overall structure of the reducing agent layers is gravimetrically matched to one another can be.
- the discharge rollers advantageously arranged a guide profile so that the falling off the roll Bulk material falls onto the guide profile and is braked by the guide profile onto each top layer.
- the discharge bunkers each advantageously have an outlet funnel, with a slot-shaped outlet opening is formed between two free edges becomes.
- the first edge lies against the discharge roller and the second edge is arranged at a certain distance from the surface of the discharge roller, so that a discharge slot is formed between the discharge roller and the second edge by stripping the layer thickness of the bulk material on the discharge roller specifies.
- the layer thickness of the bulk material on the discharge roller is determined by a scraper edge, so that the layer thickness of the Bulk goods on the discharge roller regardless of the angle of the slope Bulk goods.
- the stripping causes a more even distribution of the bulk material over the entire width of the discharge roller.
- the charging device advantageously has a second driven roller.
- This second roll which is also referred to as a tear-off roll, defines with the discharge roller has a second discharge slot, the height of which is slightly less than is the height of the discharge slot between the discharge roller and the second edge.
- the tear roll has a higher peripheral speed than that Discharge roller so that it accelerates the bulk material relative to the discharge roller and ensures that the bulk material falls off the discharge roller at an early stage. This largely avoids that the bulk material by the sole Effect of gravity uncontrolled in more or less large blocks falls off the discharge roller, which leads to a different bulk density would.
- the discharge roller can be used to Example be conical, their diameter to the center of the Focus decreases. However, the same result can also be achieved when the height of the discharge slot towards the center of the lathe decreases.
- the discharge roller can have a continuous surface. she can however, it can also be designed as a type of cellular wheel.
- the charging device is advantageous, sealed by means of water channels, integrated in a closed housing.
- each discharge bunker is preferably connected to a storage bunker via a conveyor device, wherein the conveyor device several discharge points in the Discharge bunker.
- the conveyor device several discharge points in the Discharge bunker.
- discharge bunkers with which same bulk goods are charged generally with the same storage bunker connected.
- the various discharge points of the conveyor cause the discharge hopper to be filled as evenly as possible its length.
- the conveying device comprises, for example, a fluidizing channel with or several discharge openings.
- a fluidizing channel with or several discharge openings.
- a particularly even filling of the Discharge bunkers can be reached with a conveyor, the one Fluidizing trough comprising a discharge opening which is substantially radial extends over the entire length of the discharge hopper and in the direction of rotation has a clear dimension that increases in the conveying direction.
- a rotary hearth furnace for producing sponge iron is shown schematically in FIG shown.
- the furnace comprises an annular rotary hearth 2, with a fireproof furnace bed 3.
- the rotary hearth is rotatable on one Stored foundation and surrounded on its top by an enclosure 4 (For better understanding, the housing is partially cut shown). Inside the enclosure 4 takes place in a controlled atmosphere at high temperatures of approx. 1300-1400 ° C the reduction of iron oxide to directly reduced iron instead.
- a charging device 8 fine-grained iron oxide and fine-grained coal dust in separate, superimposed layers the refractory lining of the lathe 2 charged.
- the Possibility only one layer with iron oxide and one layer with coal to charge or multiple layers of each material can be layered alternately.
- the iron oxide and coal dust get through the Rotation of the rotary hearth 2 in the reaction area 10 of the rotary hearth furnace.
- This area 10 of the rotary hearth furnace has 4 burners 12 in the housing attached that the inside of the furnace to the required reaction temperature of heat approx. 1300-1400 ° C.
- the hot exhaust gases from the burner 12 are thereby countercurrent through the furnace and then through derived a fireplace 14.
- the carbon dust releases carbon monoxide, which turns the iron oxide into iron reduced.
- the finished sponge iron is in pure form in one or more layers 16 lying one above the other. This sponge iron arrives then in the Dechargier Scheme 18 of the rotary hearth in which the Sponge iron is removed from the furnace by means of a decharging device 20 becomes.
- FIG. 2 schematically shows a charging device 8 for charging several superimposed layers of bulk material made of fine-grained bulk material. It comprises a plurality of discharge bunkers 22 which (in the direction of rotation 24) Arrow 24 indicated) are arranged one behind the other and the transversely to the direction of rotation 24 substantially over the entire width of the extend annular surface of the rotary hearth 2.
- the discharge bunkers 22 are preferably provided in an odd number and charge in the process alternately coal dust and iron oxide on the rotary hearth 2, the first Discharge bunker charges a lower layer of coal dust and the last discharge bunker the bulk layer sequence with an upper coal dust layer covers.
- the individual discharge bunkers 22 each have their own conveying device 26 with a storage bunker 28 for iron oxide or a storage bunker 30 connected for coal dust, the one above the discharge bunker 22 Support frame 32 are mounted.
- the storage bunkers 28 and 30 can be made For reasons of space, it is arranged radially outside the actual furnace area be so that there is enough space in the center of the rotary hearth, e.g. For Rotary connections for a possible media supply for the rotary hearth 2 etc.
- Fig. 3 shows a section in the direction of rotation through a discharge bunker 22. He has an outlet funnel 34 with an outlet slot in its lower region 36 on.
- the outlet slot 34 is formed by two edges 38 and 40, the first edge 38 on a rotatably mounted discharge roller 42 abuts, and the second edge 40 at a certain distance from the surface of the
- Discharge roller 42 is arranged.
- the diameter of the roller 42, as well as the The position of the two edges 38, 40 relative to the roller 42 are of this type determined that a leakage of a fine-grained bulk 43 from the Discharge hopper 22 is prevented when the discharge roller 42 is stationary.
- the thickness of this bulk material layer 48 is advantageous here by stripping on the edge 40 so that the layer thickness on the discharge roller 42 essentially independent of the flow behavior of the Bulk 43 is. It goes without saying that the surface of the roll must of course have a structure that has sufficient adhesion of the Bulk material 43 on the roll surface ensures further transport to ensure the bulk goods to the waste zone.
- a second roller 50 is on the discharge side above the discharge roller 42 in front of the zone attached, in which the gravity slipping of the bulk layer from the Discharge roller 42 would cause. It forms one with the discharge roller 42 Slot 52 from, the free cross section slightly smaller than the thickness of the bulk layer 48 is.
- the roller 50 is driven by a drive 54 with a higher one Peripheral speed driven as the discharge roller 42, in such a way that the bulk material layer 48 is relative to the surface of the discharge roller 42 accelerates. In other words, the roller 50 tears the bulk material layer 48 targeted from the discharge roller 42, before gravity slips the bulk layer from the discharge roller 42 would cause, and caused as a result, the bulk material continuously falls off the discharge roller 42.
- the bulk material falling from the discharge roller 42 falls onto a guide profile 56 which is arranged below the discharge roller 42 in such a way that it carries the bulk material in Direction of rotation (see arrow 58) leads to the rotary hearth 2.
- a guide profile 56 which is arranged below the discharge roller 42 in such a way that it carries the bulk material in Direction of rotation (see arrow 58) leads to the rotary hearth 2.
- the vertical speed component of the bulk material consequently greatly reduced, so that interfering mixing of the superimposed Layers at the interfaces are effectively avoided.
- FIG. 3 is shown schematically how an additional bulk layer 60 over two existing layers 62 and 64 are already laid.
- FIG. 3B shows a section through a heat shield for a charging device for producing six layers lying one above the other on the rotary hearth 2.
- a heat shield for a charging device for producing six layers lying one above the other on the rotary hearth 2.
- six radial slots 68 1 to 68 6 are provided in the protective shield for loading the rotary hearth 2.
- a discharge roller (not shown in FIG. 3B) is arranged above each of these slots.
- the discharge bunkers 22 are all suspended in such a way that their weight can be determined separately.
- the Example a refill tube 72, the discharge hopper 22 with the conveyor 26 or the storage bunker 28, 30 connects a certain vertical Ensure freedom of movement. This can be done, for example, by installation an axial compensator can be reached in the refill tube 72.
- the discharge bunker 22 must not be rigid in the housing 4 of the rotary hearth furnace to be involved. This object is achieved in that the discharge bunker integrated into the housing via channels 74 filled with a liquid are.
- the one that is decoupled in weight from the rest of the device Discharge hopper 22 is in a continuous weighing device in a Support structure worn. In Figure 3, this support structure is schematically as a fixed point 75 and the weighing device indicated as lever arm 76.
- the weighing device can however also include known weight measuring doses, which can then be used as a support for the discharge bunker 22.
- the measurement signal of the weighing device 76 is forwarded to a controller 78, which determines a time-related weight decrease of the discharge bunker and thus the discharge rate of the bulk material 43.
- a controller 78 determines a time-related weight decrease of the discharge bunker and thus the discharge rate of the bulk material 43.
- discharge bunkers 22 Regarding the discharge bunkers 22, it remains to be noted that their discharge funnel 34 is preferably designed such that the total weight of the bulk column in the discharge hopper 22 on one or more walls of the discharge hopper 34 weighs. This ensures that the discharge rollers 42 are not necessarily must be hung on the discharge bunkers 22 to the discharge rate of the Device about a change in weight of the bunkers relatively accurate to capture. In addition, the bulk layer is compacted on the Discharge roller 42 avoided.
- FIGS. 5 and 6 show two advantageous configurations of the discharge device, that allow, despite different peripheral speeds of the rotary hearth along the discharge roller 42, a relatively uniform To ensure layer build-up across the entire width of the lathe.
- the discharge roller 42 is cylindrical, that is, its peripheral speed is the same everywhere.
- the clear height of the discharge opening 36 ' decreases in proportion to the distance to the center of the rotary hearth.
- the thickness of the bulk layer on the discharge roller 42 also proportional to the distance from the center of the lathe from the outside to the inside, and the bulk density is consequently essentially over the entire width of the rotary hearth equal.
- the discharge roller 42 ' is conical, whereas the light one Height of the discharge opening 36 of the discharge funnel 34 'over the entire width is constant.
- FIGS. 7 and 8 A multilayer charging profile that can be achieved with a device according to the invention is shown in FIGS. 7 and 8. It is a charging profile with two iron oxide layers 86 2 , 86 4 and three carbon layers 86 1 , 86 3 , 86 5 , which are stacked on top of each other. While the carbon layers 86 1 , 86 3 , 86 5 were continuously charged over the width of the rotary hearth 2, the iron oxide layers 46 2 , 46 4 are divided into three rings lying next to one another (see FIG. 8). The latter are in turn divided into individual fields 88 1 , 88 2 , 88 3 , 88 4 by radial interruptions 87. The radial interruptions 87 are generated by briefly stopping the discharge rollers 42.
- the outlet opening 36 of the outlet funnel 34 briefly by a closing member, such as. B. a slide is closed.
- the annular interruptions are achieved by teeth 90 1 , 90 2 in the discharge openings 36 of the discharge bunkers 20, which interrupt the layer of bulk material on the discharge roller 42.
- the division of the iron oxide layers 46 2 , 46 4 into non-contiguous fields 88 1 , 88 2 , 88 3 , 88 4 causes the iron sponge to be present in the form of adjacent plates after the reduction and thus facilitates the further processing of the iron sponge.
- the annular interruptions can also be achieved by webs running in the direction of rotation, which are arranged in the slots 68 in the heat shield 66.
- FIG. 9 Another advantageous embodiment of the discharge rollers is shown in FIG. 9.
- These discharge rollers 142 comprise radially outwardly open webs 143 divided cells 144 by the outlet funnel 134 with fine-grained Bulk goods to be filled.
- the lower edge 146 of the discharge funnel 134 is connected with a jacket 148, the roller 142 to the discharge zone immediately above the slot 68 in the protective shield 66, adjacent to it entire length surrounds.
- the radially outward extending webs 143 which are located in the area of the jacket 148, are directly on this.
- the direction of rotation of the discharge roller 142 is indicated by arrow 150.
- the reference number 152 shows a speed-controlled one Drive, which allows the device of Figure 9 as above, with To operate with reference to the device of Figure 3, described.
- FIGS. 10 to 16 show several advantageous configurations of one Conveying device 26 for conveying the fine-grained bulk material from the respective storage bunkers 28, 30 to the discharge bunker 22.
- a such conveyor 26 may e.g. a chain conveyor or one Transport screw comprise and preferably has several discharge points in the discharge bunker 22 so that the feed is as uniform as possible of the discharge bunker 22 takes place across its length transversely to the direction of rotation.
- FIG Longitudinal section An advantageous embodiment of a conveyor device 26 is shown in FIG Longitudinal section shown.
- This is a fluidizing channel 26 which has a plurality of discharge points 162 to which the refill tubes are located below 72 of a discharge hopper 22.
- the number of host sites 162 can be different depending on the length of the discharge hopper 22, she will generally be between two and five.
- the fluidizing channel 26 has a closed, sloping in the conveying direction Channel 164 on the inside by a gas permeable e.g. ceramic Partition 166 into a lower gas channel 168 and an upper transport channel 170 is divided.
- a gas inlet 172 is connected to an inert gas source the inert gas under pressure as fluidizing gas into the gas channel 168 feeds.
- the fluidizing gas then passes through the pores in the gas permeable Partition 66, offset fine-grained bulk material in the transport channel 70 in a fluidized state and is then via a gas outlet 176 returned.
- the transport channel 170 has a bulk material inlet channel on its upper side 174, which is connected to the respective storage bunker 28, 30.
- This bulk material inlet channel 174 in the transport channel 170 in this is in a fluidized state offset and due to the inclination of channel 164 (e.g. 5-10 °) to the lower ones Hosted 162 sponsored.
- the discharge points 162 are formed by discharge openings 163 in the partition 166 to which Connect outlet port 178 that extends down through gas channel 68 extend through and exit at the bottom of channel 166.
- This Outlet ports 178 are the refill tubes 72 of the discharge bunker 22nd connected so that a bulk material transfer into the discharge bunker 22 enables becomes.
- the discharge openings 163 are transverse to the conveying direction of the conveying device 26 preferably arranged so offset (see Fig. 12) that only a part of the conveyed bulk material falls into the respective opening, while the rest of the Bulk material is transported to the subsequent discharge opening 163.
- the last discharge opening 163 preferably extends over the entire Width of the partition so that all the remaining bulk material from the fluidizing channel 26 is discharged.
- Crosspieces 180 can be arranged, which run in the conveying direction of the fluidizing channel 26 and which channel the bulk material to the respective discharge openings 163 (see Figure 13).
- a particularly uniform filling of the discharge bunker 22 is achieved with the in 14 and 15 shown embodiment of the conveyor 26 ' enables. It comprises a fluidizing trough with a discharge opening 163 ' is designed such that it extends over the entire length of the discharge hopper 22 Training discharge points. The discharge opening 163 'extends radially in the substantially the entire length of the discharge hopper 22 while it transverse to the conveying direction, a clear dimension increasing in the conveying direction having.
- the fluidizing channel 26 ' is directly on the discharge hopper open at the top 22 flanged.
- the bulk material flow that is below the bulk material inlet channel 174 is distributed over the entire width of the channel 170 during further transport continuously at the widening discharge opening 163 cut off and the discharge bunker 22 consequently even over his Length loaded.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Description
- Figur 1:
- eine schematische Gesamtansicht eines Drehherdofens zur Herstellung von Eisenschwamm;
- Figur 2
- eine schematische Gesamtansicht einer Chargiervorrichtung für den Drehherdofen nach Figur 1;
- Figur 3
- einen Schnitt durch eine erste Ausgestaltung einer Chargiervorrichtung;
- Figur 3B
- einen Schnitt durch einen Wärmeschutzschild unter der Chargiervorrichtung;
- Figur 4
- einen Schnitt durch eine zweite Ausgestaltung einer Chargiervorrichtung;
- Figur 5
- eine perspektivische Ansicht einer ersten Ausgestaltung einer Austragvorrichtung an einer Chargiervorrichtung;
- Figur 6
- eine perspektivische Ansicht einer zweiten Ausgestaltung einer Austragvorrichtung an einer Chargiervorrichtung;
- Figur 7
- eine Querschnitt durch eine Schichtung die sich mit einer erfindungsgemäßen Vorrichtung erzielen läßt;
- Figur 8
- einen Längsschnitt entlang der Schnittebene 8-8 durch die Schichtung nach Figur 7;
- Figur 9
- einen Schnitt durch eine weitere Ausgestaltung einer Chargiervorrichtung;
- Figur 10
- einen Längsschnitt durch eine Fördervorrichtung zum Fördern des feinkörnigen Schüttguts in den Austragbunker;
- Figur 11
- einen Schnitt entlang der Schnittlinie 11-11 durch die Vorrichtung der Figur 10;
- Figur 12
- einen Schnitt entlang der Schnittlinie 12-12 durch die Vorrichtung der Figur 10;
- Figur 13
- einen Schnitt entlang der Schnittlinie 12-12 durch eine Ausführungsvariante der Vorrichtung der Figur 10;
- Figur 14
- eine perspektivische Ansicht, teilweise geschnitten, einer weiteren Ausführungsvariante der Vorrichtung der Figur 10, mit angeschlossenem Austragbunker;
- Figur 15
- einen Schnitt durch die Vorrichtung der Figur 14, wobei die Schnittebene der Schnittebene der Figuren 12 und 13 entspricht.
Claims (18)
- Drehherdofen mit einem drehbaren Drehherd (2), gekennzeichnet durch eine Chargiervorrichtung zum Erzeugen von übereinanderliegenden 1 Schichten von feinkörnigem Schüttgut auf dem Drehherd (2), umfassend pro Schüttgutschicht jeweils einen Austragbunker (22) mit einem Auslaufschlitz (36), eine dem Auslaufschlitz (36) jeweils vorgelagerte Austragrolle (42), und ein Leitprofil (56) das jeweils unterhalb der Austragrolle (42) angeordnet ist, wobei Auslaufschlitz (36) und Austragrolle (42) sich im wesentlichen quer zur Drehrichtung des Drehherds erstrecken, das Leitprofil (56) derart angeordnet ist, daß das von der Rolle (42) abfallende Schüttgut auf das Leitprofil (56) fällt und vom Leitprofil auf den Drehherd (2) geleitet wird, und die Austragrolle (42) einen drehzahlgeregelten Antrieb (44) aufweist.
- Drehherdofen nach Anspruch 1, gekennzeichnet, durch kontinuierlich arbeitende Wiegevorrichtungen (76), die derart in die Chargiervorrichtung eingebaut sind, daß sich der Schüttgutaustrag für jedes Schüttgut getrennt erfassen läßt.
- Drehherdofen nach Anspruch 2, gekennzeichnet durch eine Drehzahlsteuerung (79) für die drehzahlgeregelten Antriebe der Austragrollen (42), welche die Drehzahl der Austragrollen (42) in Funktion der entsprechenden Meßwerte der Wiegevorrichtungen (76) festlegt.
- Drehherdofen nach Anspruch 2 oder 3, gekennzeichnet durch einen gemeinsamen Vorratsbunker (28, 30) an den jeweils mehrere Austragbunker (22) angeschlossen sind, wobei die Austragbunker (22) in vertikaler Richtung relativ zum jeweiligen Vorratsbunker bewegbar sind und mittels Wiegevorrichtungen (76) über dem Drehherd (2) aufgehängt sind.
- Drehherdofen nach Anspruch 2 oder 3, gekennzeichnet durch einen gemeinsamen Vorratsbunker an den jeweils mehrere Austragbunker (22) angeschlossen sind, wobei der Vorratsbunker (28', 30') und seine angeschlossenen Austragbunker (22) als Einheit mittels Wiegevorrichtungen (76) über dem Drehherd (2) aufgehängt sind.
- Drehherdofen nach einem der Ansprüche 1 bis 5, gekennzeichnet durch ein Wärmeschutzschild (66) das zwischen Drehherd (2) und Chargiervorrichtung (8) angeordnet ist und lediglich unter den Austragrollen (42) radiale Schlitze (68) für die Beschickung des Drehherds 2 aufweist.
- Drehherdofen nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Leitprofile (56) derart angeordnet sind, daß sie relativ zur Oberfläche des Drehherds (2) einen Spalt ausbilden, dessen Höhe ungefähr der Gesamthöhe der bereits auf dem Drehherd (2) aufliegenden Schüttgutschichten (60, 62, 64) entspricht.
- Drehherdofen nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Austragbunker (22) jeweils einen Auslauftrichter (34) mit zwei freien Kanten aufweisen, zwischen denen eine schlitzförmige Auslauföffnung (36) ausgebildet wird, wobei die erste Kante (38) an der Austragrolle (42) anliegt, und die zweite Kante (40) in einem gewissen Abstand zur Oberfläche der Austragrolle (42) angeordnet ist, derart daß ein Austragschlitz (36) zwischen Austragrolle (42) und zweiter Kante (40) ausgebildet wird, der durch Abstreifen die Schichtdicke des Schüttguts auf der Austragrolle (42) festlegt.
- Drehherdofen nach Anspruch 8, gekennzeichnet durch eine angetriebene Abreißrolle (50), die mit der Austragrolle (42) einen zweiten Auslaufschlitz (52) definiert, dessen Höhe leicht kleiner als die Höhe des Austragschlitzes (36) zwischen Austragrolle (42) und zweiter Kante (40) ist.
- Drehherdofen nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß jeder Austragbunker (22) einen Auslauftrichter (34) aufweist, der derart ausgebildet ist, daß das ganze Gewicht der Schüttgutsäule (43) im Austragbunker (22) auf den Wänden dieses Austragbunkers lastet.
- Drehherdofen nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Austragrolle (42) konisch ausgebildet ist, derart daß ihr Durchmesser zum Zentrum des Drehherds hin abnimmt.
- Drehherdofen nach einem der Ansprüche 8 bis 11, dadurch gekennzeichnet, daß die Höhe des Austragschlitzes zum Zentrum des Drehherds hin abnimmt.
- Drehherdofen nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Austragrolle (142) Zellen (144) für das Schüttgut aufweist.
- Drehherdofen nach Anspruch 13, gekennzeichnet durch einen Mantel (148) der. sich an eine erste Kante (146) des Austragbunkers (22) anschließt und der die Austragrolle (142) bis zu der Ausschüttzone anliegend auf ihrer gesamten Länge umschließt.
- Drehherdofen nach einem der Ansprüche 1 bis 14, gekennzeichnet durch Flüssigkeitsrinnen (74), mittels derer die Drehherdofen abgedichtet in eine Einhausung (4) des Drehherdofens einbindbar ist.
- Drehherdofen nach einem der Ansprüche 1 bis 15, gekennzeichnet durch einen Vorratsbunker (28, 30) für mehrere Austragbunker (22) und durch Fördervorrichtungen (26), welche die Austragbunker (22) mit ihrem jeweiligen Vorratsbunker (28, 30) verbinden, wobei die Fördervorrichtung (26) mehrere Austragungsstellen (162) in den angeschlossenen Austragbunker (22) aufweist.
- Drehherdofen nach Anspruch 16, dadurch gekennzeichnet, daß die Fördervorrichtung eine Fluidisierrinne (164) mit einer oder mehreren Austragöffnungen (163) aufweist.
- Drehherdofen nach Anspruch 17, dadurch gekennzeichnet, daß die Fluidisierrinne eine Austragöffnung (163') ausbildet, welche sich radial im wesentlichen über die gesamte Länge des Austragbunkers (22) erstreckt und in Drehrichtung eine lichte Abmessung aufweist, die in Förderrichtung zunimmt.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU90072A LU90072B1 (de) | 1997-05-30 | 1997-05-30 | Chargiervorrichtung fuer einen Drehherdofen |
LU90072 | 1997-05-30 | ||
PCT/EP1998/002796 WO1998054526A1 (de) | 1997-05-30 | 1998-05-13 | Chargiervorrichtung für einen drehherdofen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0985122A1 EP0985122A1 (de) | 2000-03-15 |
EP0985122B1 true EP0985122B1 (de) | 2001-07-04 |
Family
ID=19731690
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98929303A Expired - Lifetime EP0985122B1 (de) | 1997-05-30 | 1998-05-13 | Chargiervorrichtung für einen drehherdofen |
Country Status (10)
Country | Link |
---|---|
US (1) | US6210155B1 (de) |
EP (1) | EP0985122B1 (de) |
AU (1) | AU7911798A (de) |
BR (1) | BR9809885A (de) |
CA (1) | CA2290343A1 (de) |
DE (1) | DE59800967D1 (de) |
LU (1) | LU90072B1 (de) |
TW (1) | TW396266B (de) |
WO (1) | WO1998054526A1 (de) |
ZA (1) | ZA984528B (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1306045C (zh) | 1999-08-30 | 2007-03-21 | 株式会社神户制钢所 | 粒状还原铁原料的供给方法及其装置 |
JP4212873B2 (ja) * | 2002-11-22 | 2009-01-21 | 新日鉄エンジニアリング株式会社 | 回転炉床炉用原料供給装置 |
EP3563108B1 (de) * | 2016-12-29 | 2022-02-02 | Primetals Technologies Austria GmbH | Vorrichtung, umfassend einen wellenkühler und eine eingabevorrichtung und ein verfahren zum kühlen von heissem sinter. |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2211957A (en) | 1935-06-21 | 1940-08-20 | Hugh R Macmichael | Method of furnace charging |
DE941156C (de) | 1950-03-29 | 1956-04-05 | Administration Sequestre Des R | Vorrichtung zur Herabsetzung des Schuettgewichts des Mischgutes fuer die Sinterung, insbesondere fuer Saugzugsinteranlagen |
DE1289490B (de) | 1968-03-01 | 1969-02-13 | Miag Muehlenbau & Ind Gmbh | Silozellen in Zwillingsbauart fuer mehliges und anderes, insbesondere schwerfliessendes Gut |
FR1582172A (de) | 1968-07-09 | 1969-09-26 | ||
FR2116298B1 (de) * | 1970-12-04 | 1974-05-24 | Wieczorek Julien | |
GB1454278A (en) | 1973-11-12 | 1976-11-03 | Ass Portland Cement | Descending bed of sub-divided solid material |
US4029220A (en) * | 1975-11-28 | 1977-06-14 | Greaves Melvin J | Distributor means for charging particulate material into receptacles |
DE2814494C2 (de) | 1978-03-31 | 1983-07-28 | Mannesmann AG, 4000 Düsseldorf | Vorrichtung zum Aufgeben einer Sintermischung |
WO1986001819A1 (en) | 1984-09-17 | 1986-03-27 | Nippon Steel Corporation | Method of and apparatus for discharging pulverulent and granular substance from hermetic vertical cooling furnace |
USRE33935E (en) * | 1987-04-06 | 1992-05-26 | Apparatus and method for feeding sintering raw mix | |
LU87341A1 (fr) * | 1988-09-22 | 1990-04-06 | Wurth Paul Sa | Installation de chargement d'un four a cuve |
CA2030831A1 (en) * | 1989-11-28 | 1991-05-29 | Brian J. Lalande | Apparatus for dispensing particulate materials |
DE19529925A1 (de) * | 1995-08-01 | 1997-02-06 | Mannesmann Ag | Verfahren und Vorrichtung zur Eingabe von Schüttgut in einen Drehherdofen |
BE1010261A3 (fr) * | 1996-03-07 | 1998-04-07 | Centre Rech Metallurgique | Dispositif pour deposer en continu sur un support mobile au moins deux matieres fines en couches superposees alternees. |
AT403519B (de) | 1996-06-05 | 1998-03-25 | Voest Alpine Ind Anlagen | Vorrichtung zum aufbringen von sintermaterial auf eine bereits gezündete sintergrundschicht |
US5895215A (en) * | 1997-10-14 | 1999-04-20 | Maumee Research & Engineering, Inc. | Charging apparatus for a rotary hearth furnance |
-
1997
- 1997-05-30 LU LU90072A patent/LU90072B1/de active
-
1998
- 1998-05-13 WO PCT/EP1998/002796 patent/WO1998054526A1/de active IP Right Grant
- 1998-05-13 EP EP98929303A patent/EP0985122B1/de not_active Expired - Lifetime
- 1998-05-13 CA CA002290343A patent/CA2290343A1/en not_active Abandoned
- 1998-05-13 BR BR9809885-3A patent/BR9809885A/pt active Search and Examination
- 1998-05-13 US US09/424,759 patent/US6210155B1/en not_active Expired - Fee Related
- 1998-05-13 DE DE59800967T patent/DE59800967D1/de not_active Expired - Fee Related
- 1998-05-13 AU AU79117/98A patent/AU7911798A/en not_active Abandoned
- 1998-05-15 TW TW087107576A patent/TW396266B/zh not_active IP Right Cessation
- 1998-05-27 ZA ZA984528A patent/ZA984528B/xx unknown
Also Published As
Publication number | Publication date |
---|---|
BR9809885A (pt) | 2000-06-27 |
AU7911798A (en) | 1998-12-30 |
EP0985122A1 (de) | 2000-03-15 |
WO1998054526A1 (de) | 1998-12-03 |
CA2290343A1 (en) | 1998-12-03 |
DE59800967D1 (de) | 2001-08-09 |
TW396266B (en) | 2000-07-01 |
LU90072B1 (de) | 1998-12-01 |
ZA984528B (en) | 1998-12-08 |
US6210155B1 (en) | 2001-04-03 |
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