EP0985122A1 - Dispositif de chargement pour four a sole tournante - Google Patents

Dispositif de chargement pour four a sole tournante

Info

Publication number
EP0985122A1
EP0985122A1 EP98929303A EP98929303A EP0985122A1 EP 0985122 A1 EP0985122 A1 EP 0985122A1 EP 98929303 A EP98929303 A EP 98929303A EP 98929303 A EP98929303 A EP 98929303A EP 0985122 A1 EP0985122 A1 EP 0985122A1
Authority
EP
European Patent Office
Prior art keywords
discharge
charging device
bulk material
bunker
rotary hearth
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.)
Granted
Application number
EP98929303A
Other languages
German (de)
English (en)
Other versions
EP0985122B1 (fr
Inventor
Gilbert Bernard
Emile Lonardi
Romain Frieden
Patrick Hutmacher
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.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
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 Paul Wurth SA filed Critical Paul Wurth SA
Publication of EP0985122A1 publication Critical patent/EP0985122A1/fr
Application granted granted Critical
Publication of EP0985122B1 publication Critical patent/EP0985122B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • 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
    • 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
    • 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
    • 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 charging device for producing superimposed layers of fine-grained bulk material on a rotary hearth. It is particularly suitable for the application of a new type of direct reduction of iron ore in a rotary hearth furnace.
  • Sponge iron is produced in a direct reduction process by reducing iron oxide with solid or gaseous reducing agents.
  • the solid reducing agent used is, for example, carbon, which reacts with oxygen at higher temperatures to form the reducing gas CO.
  • Such a process can be carried out, for example, in a rotary hearth furnace, i.e. in a furnace with a rotatable ring-shaped furnace bottom, which is covered on the top with refractory material and which is surrounded by a housing.
  • Burners are attached to the top of the housing, which penetrate the housing and heat the interior of the housing to the required reaction temperature of over 1000 ° C.
  • the iron oxide together with the reducing agent is applied to the rotary hearth at a first point of the rotary hearth furnace and passes through the rotation of the rotary hearth into the interior of the housing, where, due to the high temperatures, it reacts with the reducing agent to be direct after about one turn of the rotary hearth reduced iron.
  • the form in which the iron is present depends on the type of process used.
  • the iron oxide is pressed together with the reducing agent into pellets before charging into the rotary hearth furnace, which pellets are then subsequently charged onto the rotary hearth of the furnace.
  • the iron oxide within the individual pellets reacts with the carbon monoxide released by the carbon and is reduced to iron within the pellets.
  • the iron sponge is thus in pellet form after the reduction, the pellets also being the Residues of the reducing agent (ash) and any impurities such as sulfur.
  • a further process step is therefore necessary in which the directly reduced iron is separated from the ashes and the impurities.
  • fine-grained iron oxide and fine-grained reducing agent eg coal
  • fine-grained iron oxide and fine-grained reducing agent eg coal
  • carbon monoxide is released in the carbon layer or layers, which penetrates through the fine-grained iron oxide layers and reduces them to iron.
  • the reduced iron is consequently present in pure form in one or more superimposed layers after the reduction process, the individual iron layers being separated from one another by layers of reducing agent residues and these ash layers being in loose form.
  • this process offers the advantage that the sponge iron and the residues of the reducing agent can be separated easily.
  • the basic requirement for an economical implementation of this reduction process is, however, that the charging device of the rotary hearth furnace is capable of producing an optimal layering of the metal oxide and the reducing agents on the rotary hearth. It is therefore an object of the present invention to provide a rotary hearth furnace, the charging device of which largely fulfills this requirement.
  • a charging device accordingly has one discharge bunker, with one discharge slot, and one discharge roller upstream of the discharge slot, for each metal oxide or reducing agent layer.
  • the outlet slot and Discharge roller essentially transverse to the direction of rotation of the rotary hearth, and the discharge rollers have a speed-controlled drive. If the speed of rotation of a discharge roller is increased, the bulk material discharge from the corresponding discharge bunker increases. If, on the other hand, the speed of rotation of a discharge roller is reduced, the bulk material discharge from the corresponding discharge bunker is reduced.
  • metal oxide and reducing agent layers lying one above the other can thus be applied to the annular furnace bottom, the ratio of metal oxide / reducing agent in the stratification being adaptable to an optimal sequence of the reduction process via the speed-controlled discharge rollers.
  • a layer can also be interrupted by briefly stopping a discharge roller, so that piles arranged one behind the other in the direction of rotation are formed. Such a discontinuous layer simplifies, for example, decharging the metal sponge produced, since it is not a continuous strand of material that is produced, but individual, separate pieces of sponge.
  • the reduction process can be further optimized by gravimetric control of the layer structure.
  • the device according to the invention need only have continuous weighing devices which are built into the charging device in such a way that the bulk material discharge of the metal oxides and reducing agents can be determined gravimetrically.
  • a speed control for the speed-controlled drives of the discharge rollers controls the speed of the discharge rollers as a function of the corresponding gravimetric measured values of the weighing devices.
  • the discharge bunkers for the metal oxide or for the reducing agent are connected to a storage bunker for the metal oxide or for the reducing agent, but they can be moved in the vertical direction relative to the respective storage bunker, and by means of weight measuring cells above the Rotary hearth are hung.
  • the bulk material discharge from each discharge bunker can be recorded separately, so that the structure of each individual layer can be controlled gravimetrically.
  • the discharge bunkers for the metal oxide form a first separate unit together with a storage bunker for the metal oxide, which is suspended above the rotary hearth by means of weight measuring cells, and the discharge bunkers for the reducing agents together with a storage bunker for the reducing agents second unit, which is suspended by means of weight measuring cells above the rotary hearth.
  • the entire bulk material discharge from the storage bunker for the metal oxide and the storage bunker for the reducing agent can be recorded separately gravimetrically, so that the overall structure of the metal oxide layers and the overall structure of the reducing agent layers can be adapted to one another gravimetrically.
  • a guide profile is advantageously arranged below the discharge rollers in such a way that the bulk material falling off the roller falls onto the guide profile and is braked by the guide profile the top layer is routed.
  • the discharge bunkers each advantageously have an outlet funnel, a slot-shaped outlet opening being formed between two free edges.
  • 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, which defines the layer thickness of the bulk material on the discharge roller by stripping.
  • 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 material on the discharge roller is independent of the angle of repose of the bulk material.
  • wiping causes the bulk material to be distributed more evenly across the entire width of the discharge roller.
  • the charging device advantageously has a second driven roller.
  • This second roller which is also referred to as a tear-off roller, defines with the discharge roller 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-off roller has a higher peripheral speed than the 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 prevents the bulk material from falling uncontrollably from the discharge roller in more or less large blocks due to the sole action of gravity, which would lead to a different bulk density.
  • discharge bunker with an outlet funnel which is designed such that the entire weight of the bulk material column in the discharge bunker rests on the walls of this discharge bunker.
  • the discharge roller can, for example, be conical, its diameter decreasing towards the center of the rotary hearth.
  • the same result can also be achieved if the height of the discharge slot decreases towards the center of the rotary hearth.
  • the discharge roller can have a continuous surface. However, it can also be designed as a type of cellular wheel.
  • the charging device is advantageously integrated in a closed housing, sealed by means of water channels.
  • each discharge bunker is preferably connected to a storage bunker via a conveying device, the conveying device having a plurality of discharge points in the discharge bunker.
  • Discharge bunkers with which the same bulk material is charged are generally connected to the same storage bunker.
  • the various discharge points of the conveyor device cause the discharge hopper to be filled as uniformly as possible over its length.
  • the conveying device comprises, for example, a fluidizing trough with one or more discharge openings.
  • a particularly uniform filling of the discharge bunker can be achieved with a conveying device which comprises a fluidizing channel with a discharge opening which extends radially essentially over the entire length of the discharge bunker and has a clear dimension in the direction of rotation which increases in the direction of conveyance.
  • Figure 1 is a schematic overall view of a rotary hearth furnace for the production of sponge iron
  • FIG. 2 shows a schematic overall view of a charging device for the rotary hearth furnace according to FIG. 1;
  • FIG. 3 shows a section through a first embodiment of a charging device
  • FIG. 3B shows a section through a heat shield under the charging device
  • FIG. 4 shows a section through a second embodiment of a charging device
  • FIG. 5 shows a perspective view of a first embodiment of a discharge device on a charging device
  • FIG. 6 shows a perspective view of a second embodiment of a discharge device on a charging device
  • FIG. 7 shows a cross section through a stratification which can be achieved with a device according to the invention
  • FIG. 8 shows a longitudinal section along the sectional plane 8-8 through the stratification according to FIG. 7;
  • FIG. 9 shows a section through a further embodiment of a charging device
  • FIG. 10 shows a longitudinal section through a conveying device for conveying the fine-grained bulk material into the discharge bunker
  • FIG. 11 shows a section along the section line 11-11 through the device of Figure 10;
  • FIG. 12 shows a section along the section line 12-12 through the device of FIG. 10;
  • FIG. 13 shows a section along the section line 12-12 through an embodiment variant of the device of FIG. 10;
  • FIG. 14 shows a perspective view, partly in section, of a further embodiment variant of the device of FIG. 10, with a connected discharge hopper;
  • FIG. 15 shows a section through the device of FIG. 14, the section plane corresponding to the section plane of FIGS. 12 and 13.
  • a rotary hearth furnace for the production of sponge iron is shown schematically.
  • the furnace comprises an annular rotary hearth 2 with a refractory furnace bed 3.
  • the rotary hearth is rotatably mounted on a foundation and is surrounded on its upper side by a housing 4 (the housing is shown partly in section for better understanding).
  • the reduction of iron oxide to directly reduced iron takes place in a controlled atmosphere at high temperatures of approx. 1300-1400 ° C.
  • fine-grained iron oxide and fine-grained coal dust are charged in separate, superimposed layers on the refractory lining of the rotating hearth 2 in a first area 6 of the rotary hearth furnace by means of a charging device.
  • the iron oxide and the coal dust reach the reaction area 10 of the rotary hearth furnace through the rotation of the rotary hearth 2.
  • this area 10 of the rotary hearth furnace 4 burners 12 are installed in the housing, which heat the furnace interior to the required reaction temperature of approx. 1300-1400 ° C.
  • the hot exhaust gases from the burners 12 are passed through the furnace in a countercurrent process and then discharged through a chimney 14.
  • the carbon dust releases carbon monoxide, which reduces the iron oxide to iron.
  • the finished sponge iron is present in pure form in one or more layers 16 lying one above the other. This sponge iron then reaches the decharging area 18 of the rotary hearth furnace, in which the sponge iron is removed from the furnace by means of a decharging device 20.
  • 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 are arranged one behind the other in the direction of rotation 24 (indicated by arrow 24) of the rotary hearth and which extend transversely to the direction of rotation 24 essentially over the entire width of the annular surface of the rotary hearth 2.
  • the discharge bunkers 22 are preferably provided in an odd number and alternately charge coal dust and iron oxide onto the rotary hearth 2, the first discharge bunker charging a lower layer of coal dust and the last discharge bunker covering the bulk material sequence with an upper layer of coal dust.
  • the individual discharge bunkers 22 are each connected via their own conveying device 26 to a storage bunker 28 for iron oxide or a storage bunker 30 for coal dust, which are mounted on a support frame 32 above the discharge bunkers 22.
  • the storage bunkers 28 and 30 can be arranged radially outside the actual furnace area for reasons of space, so that there is sufficient space in the center of the rotary hearth furnace, e.g. for rotary connections for any media supply to the rotary cooker 2, etc.
  • FIG. 3 shows a section in the direction of rotation through a discharge bunker 22. It has an outlet funnel 34 with an outlet slot 36 in its lower region.
  • the outlet slot 34 is formed by two edges 38 and 40, the first edge 38 abutting a rotatably mounted discharge roller 42 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 position of the two edges 38, 40 relative to the roller 42, are defined in such a way that a fine-grained bulk material 43 is prevented from escaping from the discharge hopper 22 when the discharge roller 42 is stationary.
  • the discharge roller 42 is driven by a drive 44 in the direction of the arrow 46, the fine-grained bulk material 44, which flows freely from the outlet slot 36 onto the surface of the roller 42, is carried along by the discharge roller 42, whereby on the surface of the roller 42 forms a bulk material layer 48.
  • the thickness of this bulk material layer 48 is advantageously determined by wiping it off at the edge 40, so that the layer thickness on the discharge roller 42 is essentially independent of the flow behavior of the bulk material 43. It goes without saying that the surface of the roller must of course have a structure which ensures sufficient adhesion of the bulk material 43 to the roller surface in order to ensure the further transport of the bulk material to the waste zone.
  • a second roller 50 is mounted on the discharge side above the discharge roller 42 in front of the zone in which gravity would cause the bulk material layer to slide off the discharge roller 42. It forms a slot 52 with the discharge roller 42, the free cross section of which is slightly smaller than the thickness of the bulk material layer 48.
  • the roller 50 is driven by a drive 54 at a higher peripheral speed than the discharge roller 42, in such a way that it accelerates the bulk material layer 48 relative to the surface of the discharge roller 42. In other words, the roller 50 deliberately tears the bulk material layer 48 away from the discharge roller 42 before gravity would cause the bulk material layer to slide off the discharge roller 42, and thereby causes the bulk material to fall off the discharge roller 42 more continuously.
  • FIG. 3 shows schematically how an additional layer of bulk material 60 is placed over two layers 62 and 64 already present.
  • a heat shield 66 is arranged between the rotary hearth 2 and the charging device 8.
  • radial slots 68 are provided only under the discharge rollers 42 for loading the rotary hearth 2.
  • Insulated covers 70 allow the slots 68 to be covered when not in use. It should also be noted that the oblique course of the slots 68 prevents direct illumination of the discharge devices 22, 42 arranged above the slots 68.
  • 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 ⁇ 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.
  • a refill tube 72 which connects the discharge bunker 22 to the conveying device 26 or the storage bunker 28, 30, must guarantee a certain vertical freedom of movement. This can be achieved, for example, by installing an axial compensator in the refill tube 72.
  • the discharge bunker 22 must not be rigidly integrated into the housing 4 of the rotary hearth furnace. This object is achieved in that the discharge bunkers are integrated into the housing via channels 74 filled with a liquid are.
  • the discharge hopper 22, which is decoupled in weight from the rest of the device in this way, is carried in a support structure by means of a continuous weighing device. In Figure 3, this support structure is indicated schematically as a fixed point 75 and the weighing device as a lever arm 76.
  • the weighing device can, however, also comprise known weight load cells, which are then used as supports for the discharge bunker 22.
  • the measurement signal of the weighing device 76 is forwarded to a controller 78, which determines a time-related decrease in weight of the discharge bunker and thus the discharge rate of the bulk material 43.
  • the discharge rate of the roller 42 can thus be regulated continuously.
  • This allows the structure of the bulk material layer 60 to be controlled gravimetrically. In other words, the bulk density (kg bulk material / m2 hearth surface) in each shift can be adjusted continuously.
  • the discharge bunkers 22 ', 22 "each form a jointly suspended unit with their associated storage bunkers 28, 30, the total weight of which is determined via a continuous weighing device 76', 76".
  • discharge bunkers 22 only the global bulk density of a bulk material on the rotary hearth 2 can be adjusted.
  • discharge bunkers 22 it should also be noted that their discharge funnel 34 is preferably designed such that the entire weight of the bulk material column in the discharge bunker 22 rests on one or more walls of the discharge funnel 34. This ensures that the discharge rollers 42 do not necessarily have to be suspended from the discharge bunkers 22 in order to record the discharge rate of the device relatively accurately by changing the weight of the bunkers. In addition, compacting of the bulk material layer on the discharge roller 42 is avoided.
  • FIGS. 5 and 6 show two advantageous embodiments of the discharge device which, despite different peripheral speeds of the rotary hearth along the discharge roller 42, allow a relatively uniform layer structure to be ensured over the entire width of the rotary hearth.
  • the discharge roller 42 is cylindrical, that is, its peripheral speed is the same everywhere.
  • the thickness of the bulk material layer on the discharge roller 42 also decreases in proportion to the distance from the center of the rotary hearth from the outside inwards, and the bulk density is consequently essentially the same over the entire width of the rotary hearth.
  • the discharge roller 42 ' is conical, whereas the clear height of the discharge opening 36 of the discharge funnel 34' is constant over the entire width.
  • the peripheral speed and thus the discharge rate of the discharge roller 42 decrease in proportion to the decrease in the peripheral speed of the rotary hearth 2 from the outside inwards, and the bulk density is consequently essentially the same over the entire width of the rotary hearth.
  • 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 862, 86 4 and three carbon layers 86 1 , 863, 865, which are stacked on top of each other. While the carbon layers 86, 863, 865 were continuously charged over the width of the rotary hearth 2, the iron oxide layers 462, 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-
  • 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 90-9O2 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 , 882, 883, 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 sponge iron.
  • 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. Another advantageous embodiment of the discharge rollers is shown in FIG.
  • These discharge rollers 142 comprise cells 144 which are open radially outwards and are subdivided by webs 143 and which are filled with fine-grained bulk material by the discharge funnel 134.
  • the lower edge 146 of the discharge funnel 134 is connected to a jacket 148 which surrounds the roller 142, over its entire length, up to the dispensing zone directly above the slot 68 in the protective shield 66.
  • the webs 143 which extend radially outwards and which are located in the region of the jacket 148 bear directly against the latter.
  • the direction of rotation of the discharge roller 142 is indicated by the arrow 150.
  • the reference number 152 shows a speed-controlled drive which allows the device of FIG. 9 to be operated as described above with reference to the device of FIG. 3.
  • FIGS. 10 to 16 show several advantageous configurations of a conveying device 26 for conveying the fine-grained bulk material from the respective storage bunker 28, 30 to the discharge bunker 22.
  • a conveyor 26 can e.g. comprise a chain conveyor or a screw conveyor and preferably has a plurality of discharge points in the discharge bunker 22 so that the discharge bunker 22 is loaded as uniformly as possible over its length transverse to the direction of rotation.
  • FIG. 10 An advantageous embodiment of a conveyor device 26 is shown in longitudinal section in FIG. 10.
  • This is a fluidizing channel 26 which has a plurality of discharge points 162, to which the refill tubes 72 of a discharge bunker 22 are connected at the bottom.
  • the number of discharge points 162 can vary depending on the length of the discharge bunker 22, it will generally be between two and five.
  • the fluidizing channel 26 has a closed channel 164, which drops in the conveying direction and which is internally covered by a gas-permeable, for example ceramic Partition 166 is divided into a lower gas channel 168 and an upper transport channel 170.
  • a gas inlet 172 is connected to an inert gas source which feeds inert gas under pressure as fluidizing gas into the gas channel 168.
  • the fluidizing gas then passes through the pores in the gas-permeable partition 66, sets fine-grained bulk material in the transport channel 70 into a fluidized state and is then returned via a gas outlet 176.
  • the transport channel 170 has on its upper side a bulk material inlet channel 174 which is connected to the respective storage bunker 28, 30.
  • the iron oxide or the coal dust enters the transport channel 170 through this bulk material inlet channel 174, is put into a fluidized state in this and is conveyed to the lower discharge points 162 due to the inclination of the channel 164 (eg 5-10 °).
  • the discharge points 162 are formed by discharge openings 163 in the dividing wall 166, to which are connected outlet nozzles 178 which extend downward through the gas channel 68 and emerge on the underside of the channel 166. These outlet connections 178 are connected to the refill pipes 72 of the discharge bunkers 22, so that bulk material transfer into the discharge bunkers 22 is made possible.
  • the discharge openings 163 are preferably arranged so as to be offset transversely to the conveying direction of the conveying device 26 (see FIG. 12) such 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 the entire remaining bulk material is discharged from the fluidizing channel 26.
  • webs 180 can be arranged in the transport channel 170, which run in the conveying direction of the fluidizing channel 26 and which channel the bulk material to the respective discharge openings 163 (see FIG. 13).
  • a particularly uniform filling of the discharge hopper 22 is achieved with the configuration of the conveying device 26 'shown in FIGS. 14 and 15.
  • the fluidizing trough 26 ' is flanged directly to the discharge hopper 22 which is open at the top.
  • the bulk material flow which is distributed beneath the bulk material inlet channel 174 over the entire width of the channel 170, is thus continuously cut off at the widening discharge opening 163 during further transport, and the discharge bunker 22 is consequently fed uniformly over its length.

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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)

Abstract

L'invention concerne un dispositif de chargement pour l'obtention de couches superposées de matière en vrac de fine granulométrie sur une sole tournante (2), comprenant, pour chaque couche de matière en vrac à charger, une trémie de déversement (22) présentant une rainure de décharge (36) et un rouleau déverseur (42) associé à la rainure de décharge (36), ladite rainure de décharge (36) et le rouleau déverseur (42) s'étendant sensiblement perpendiculairement au sens de rotation de la sole tournante, ledit rouleau déverseur (42) présentant une commande de réglage de la fréquence de rotation (44).
EP98929303A 1997-05-30 1998-05-13 Dispositif de chargement pour four a sole tournante Expired - Lifetime EP0985122B1 (fr)

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 (fr) 1997-05-30 1998-05-13 Dispositif de chargement pour four a sole tournante

Publications (2)

Publication Number Publication Date
EP0985122A1 true EP0985122A1 (fr) 2000-03-15
EP0985122B1 EP0985122B1 (fr) 2001-07-04

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Application Number Title Priority Date Filing Date
EP98929303A Expired - Lifetime EP0985122B1 (fr) 1997-05-30 1998-05-13 Dispositif de chargement pour four a sole tournante

Country Status (10)

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US (1) US6210155B1 (fr)
EP (1) EP0985122B1 (fr)
AU (1) AU7911798A (fr)
BR (1) BR9809885A (fr)
CA (1) CA2290343A1 (fr)
DE (1) DE59800967D1 (fr)
LU (1) LU90072B1 (fr)
TW (1) TW396266B (fr)
WO (1) WO1998054526A1 (fr)
ZA (1) ZA984528B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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
KR102389265B1 (ko) * 2016-12-29 2022-04-20 프리메탈스 테크놀로지스 오스트리아 게엠베하 벌크 재료의 냉각

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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 (fr) * 1968-07-09 1969-09-26
FR2116298B1 (fr) * 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 (fr) * 1984-09-17 1986-03-27 Nippon Steel Corporation Procede et appareil de decharge d'une substance pulverulente et granulee d'un fourneau vertical hermetique de refroidissement
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 (fr) * 1989-11-28 1991-05-29 Brian J. Lalande Appareil de distribution de matieres particulaires
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

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Title
See references of WO9854526A1 *

Also Published As

Publication number Publication date
LU90072B1 (de) 1998-12-01
EP0985122B1 (fr) 2001-07-04
DE59800967D1 (de) 2001-08-09
CA2290343A1 (fr) 1998-12-03
US6210155B1 (en) 2001-04-03
WO1998054526A1 (fr) 1998-12-03
AU7911798A (en) 1998-12-30
BR9809885A (pt) 2000-06-27
TW396266B (en) 2000-07-01
ZA984528B (en) 1998-12-08

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