WO2009071406A1

WO2009071406A1 - Device for loading a furnace

Info

Publication number: WO2009071406A1
Application number: PCT/EP2008/064905
Authority: WO
Inventors: Matthias Krieg; Ulrich Schmieder; Helmut Schneider
Original assignee: Siemens Aktiengesellschaft
Priority date: 2007-12-05
Filing date: 2008-11-04
Publication date: 2009-06-11
Also published as: DE102007058448A1

Abstract

The invention relates to a device for loading a furnace (2), particularly an electric arc furnace, with materials for the production of a metal melt, having at least one feed path (1) along which a first material and at least a second material can be fed to the furnace (2). Because the feed path (1) comprises a first container (4) for the intermediate storage of the first material, and at least one second container (5) for the intermediate storage of the at least second material, a feed device (3, 3') for feeding at least one of the materials into a respective container (4, 5), and a discharge device (6) for discharging at least one of the materials from the container (4, 5) thereof into the furnace (2), the reliability and flexibility of a loading device are increased.

Description

description

Device for feeding a furnace

The invention relates to a device for charging a furnace, in particular an electric arc furnace, with materials for producing a molten metal, with at least one conveying path, along which a first material and at least one second material are supplied to the furnace.

In the production of molten metals, especially molten steel, substances are required for their production. Such materials include sponge iron in hot or cold form, also known as Hot Direct Reduced Iron, abbreviated: HDRI, or CoId Direct Reduced Iron, abbreviated CDRI, and sponge iron briquettes. Furthermore, other substances such as lime, coal, other aggregates or mixtures are usually required.

The hot sponge iron is usually obtained from iron ore by means of a direct reduction process. The required direct reduction plant is usually located near a furnace, usually an electric arc furnace.

The addition of the materials for the production of molten metal is usually via conveyor paths, which often include chutes and conveyor belts. The amount and time of addition of the substances is usually essential in the production of molten metal, in particular in an electric arc furnace. As a rule, for the supply of substances in the furnace mostly common delivery routes for the different substances are used.

Since the materials are usually transported from different material storage sites to the oven, often result in long delivery travel times due to relatively long distances. These are to be taken into account during the charging or charging or loading of the furnace. International patent application WO 2006/111579 A1 discloses means for transporting hot granular material from a loading zone to an electric arc furnace. Such a transport device for feeding a furnace with HDRI on the one hand technically complex and wear and prone to errors.

The object of the present invention is to increase the reliability and flexibility of a feeder.

The object is achieved in a generic charging device in that the conveying path comprises a first container for temporarily storing the first substance and at least one second container for temporarily storing the at least second substance, a feeding device for feeding at least one of the substances into a respective container, and a Removal device for discharging at least one of the substances from a respective container in the furnace comprises.

Such a design of the conveying path allows, in particular, for the speed and direction of the substances to be made available in a defined and improved manner for the production of the molten metal on leaving the discharge device in the furnace. This is particularly important for the introduction of hot sponge iron in the oven. This is because high exit velocities, which can occur when the hot sponge is fed directly from a gravity-driven direct reduction plant into the furnace and can lead to electrode fractures, can be avoided here. The substance is brought by means of the container just before the furnace in a defined, approximately dormant state, which takes positive influence on the manufacturing process of molten metals due to the defined initial conditions. The intermediate storage of the substance in this case consists of only one

Passing through the material through the container, whereby the boundary conditions for the substance, such as its speed, can be determined in a defined manner by passing through the container. be put. Thus, for example, the exit velocities of the substances in the furnace can be adjusted in an improved manner. Also, by the invention, a different wear and conveying behavior of the substances to be used are taken into account. Preferably, the at least two containers for temporary storage are configured such that the substance supplied to at least two containers is braked to a predetermined speed, in particular essentially zero.

Furthermore, it is possible, with appropriate design of the container, to place a substance buffer for approximately lime or coal relatively close to the furnace. In these, a substance can be stored for a long time and only dissipated discharged into the oven when it is needed. This reduces the times for transporting substances into the oven. Thus, the reaction times, i. the times from the recognition that a certain charge in the furnace is required until the arrival of the substances to provide the appropriate batching in the furnace, shortened during charging. Furthermore, problems that have occurred in the conveying path in front of the containers, for example a blockage of a conveying path, can at least be compensated for at times. The molten metal to be produced or produced is thus less endangered by errors in the conveying path. Optionally, a targeted control of the flow of material from a container can be made possible by an optional material flow control device provided for at least one container.

The term substance is understood in the context of this application not only the actual substance or a mixture of several substances, but it should be miterfasst by the term substance and their properties, such as temperature of the substance on the conveyor, piece or spatial dimensions of smallest conveyed units, wear behavior of the substance, among others; in doubt, therefore, the term substance is to be interpreted broadly. A container may be provided for receiving various substances. Preferably, the containers are disposed above the furnace so that the conveyance of solids from the containers into the furnace is effected by gravity. By appropriate arrangement of the containers at the same or different heights above the furnace, an optimum feed rate and feeding direction for the respective substance can thus be provided in the oven, without having to provide additional technical means for transporting the substances. In particular, in such an embodiment, a feeder is hardly susceptible to error. For the feed device according to the invention more than two containers can be used, in particular three, four or five.

The charging device is usually between a direct reduction plant, preferably gravity-driven, for example. For HDRI, and / or one or more material stocks, for example. For CDRI, briquetted sponge iron, lime, coal or the like, and a furnace for the production of Metal melts, in particular an electric arc furnace, arranged.

In an advantageous embodiment of the invention, the discharge device is pivotable between a first discharge position in which substances are discharged into the oven, and a second discharge position in which substances are not discharged into the oven. Due to the pivotable design of the discharge device, it is possible to enable emergency removal of material from the containers, if necessary, without great technical effort. As a result, all substances can be substantially completely discharged from the conveying path and discharged into an emergency reservoir. In particular, it is advantageous in this case to design the discharge device in such a way that an outlet of the discharge device, through which substances exit from the discharge device, moves substantially in a horizontal plane. Thus, a technically simple solution is provided, which allows a rapid response in emergencies. In a further advantageous embodiment, the removal of substances from at least two containers is possible both in the first and in the second discharge position. This ensures that a discharge or discharge of substances from the containers in the respective discharge position can take place simultaneously and thus more quickly. Substances in the oven can thus be efficiently introduced from the containers, provided that the discharge device is arranged in the first discharge position. Respectively, there are substances efficiently from the conveyor, in particular the containers, executable in an emergency reservoir by an emergency release in the second discharge position of the discharge device can be done simultaneously for at least two, preferably all containers.

In a particularly advantageous embodiment of the invention, at least in sections, a protective gas can be supplied to the conveying path. This is of particular relevance when substances with high chemical reactivity are to be transported on a conveying path of the feeding device. For example, this substance may be hot, directly reduced iron. This has a temperature of 650 ⁰ C and oxidizes very easily with the atmospheric oxygen. However, this should be avoided because the directly reduced iron was previously made consuming and should be supplied to the furnace for producing a molten metal in this reduced state. The shielding gas should therefore in the present case primarily prevent the oxidation of the hot directly reduced iron. As protective gas, for example nitrogen, carbon dioxide or argon can be used. A shielding gas is usually used only in sections of the feeder in which this is also required to keep costs low. The conveying path is preferably tubular and dense in those sections in which protective gas is to be conducted.

In a further advantageous embodiment of the invention, the conveying path is at least partially dependent on a nem to be conveyed material designed such that the substance, in particular at the exit from the discharge device, reaches a predetermined minimum speed, but does not exceed a predetermined maximum speed. This allows an individual adaptation of the conveying path to the substance to be transported. Exceeding a minimum speed or falling below a maximum speed can be achieved, for example, in conveying methods based on the promotion of gravity through the inclination of the conveying path, corresponding braking and / or deflection devices, or the friction and / or sliding properties of the conveying path. The latter can be adjusted, for example, by coating a section of a conveying path by means of a suitable coating. Through this, the friction can be increased or decreased if necessary, so that a certain target speed is achieved. A minimum velocity of the effluent is required in that the furnish fed into the furnace occupies a certain position in the furnace and, upon entering the furnace, is to penetrate the slag floating on the melt. In particular, in an electric arc furnace, the substance should be arranged as close as possible to the graphite electrode in order to ensure a high energy input into the melt. On the other hand, a maximum speed in the discharge of material from the discharge device should not be exceeded. Because an increased speed of the substance leads to increased friction and increased wear of the conveyor. This is not desirable. In addition, in the case of an electric arc furnace, the graphite electrodes can be damaged by the excessive entry velocities of a substance. Therefore, in particular a target exit speed from the discharge device is selected such that the desired position of the exiting material in the oven is achieved as safely as possible, but on the other hand, the affected conveying path is not claimed beyond measure.

In a further advantageous embodiment of the invention, the conveying path is at least partially configured in such a way. It is known that a material that tends to agglomerate can be conveyed in an agglomerated state. As an example of an agglomerating material in the field of liquid steel production, for example, briquetted sponge iron may be mentioned. Iron sponge briquettes do not form individual briquettes in faulty production processes, but rather a press agglomerate of briquettes, in which the individual briquettes are still connected to one another. As a result, the transport of iron sponge briquettes is generally associated with increased wear. In addition, due to the agglomeration, there is the danger of a conveying path blockage through the material. In order to ensure trouble-free operation of the feeding device despite material agglomerates in the conveying path, the conveying path for such substances is usually specially designed. For example, large spatial dimensions, in particular with closed chutes large diameters, can be provided for such conveying paths. The dimension of the conveying path can be selected depending on the average size or size distribution of the agglomerates. Furthermore, it is also possible to provide means which, in an agglomerated state, break up again into smaller units of matter. Also, special wear plates in deflections of such materials are conceivable.

Furthermore, it is advantageous that the feed device has a switch, by means of which a material can optionally be fed to one of the at least two containers. As a result, both the technical complexity and the cost of the charging device can be reduced. Because it does not have to be provided for each container its own feeder. Preferably, all containers are supplied via a common feeder with substances. The switch may be designed, for example, as a controllable pivoting element which influences the conveying path to be taken of the material coming from the supply device. The charging device thus has at least one feeding device. In a further advantageous embodiment of the invention, the switch is arranged downstream of at least one gas lock. This is particularly useful when one of the containers is flooded, for example, with a protective gas, for example, to prevent oxidation of hot sponge iron. The

Gas lock causes on the one hand, that the inert gas does not leave the container for which it is intended, and on the other hand, no oxygen in the air enters the protective gas-flooded container through the switch, if further substance is introduced into the container.

In a further advantageous embodiment of the invention, at least one container on a fireproof interior trim. This allows hot substances, in particular hot, directly reduced iron, which has a temperature of about 650 ^° C., to be stored in the container.

In a preferred embodiment of the invention, the discharge device has an outlet-side mouth piece, which is detachably connected to the rest of the discharge device. At the mouthpiece of the discharge device regularly occur on the highest material speeds. As a result, the mouthpiece also experiences the highest degree of wear. This has the consequence that the mouthpiece is already worn when other parts of the conveyor, in particular the discharge device, are still functional. In order not to have to replace the entire discharge device or larger segments of the discharge device in such cases, the outlet-side orifice piece is detachably connected to the rest of the discharge device. So it is possible to replace only the mouth piece, if it is worn. This can be done relatively quickly and inexpensively. In contrast, replacement of an entire discharge path would be expensive and costly.

In a further preferred embodiment of the invention, the conveying path between the at least two containers and the furnace for the first and the at least second material at least partially separate Förderwegzweige on. This allows the substance to be fed in sections or completely separated from the furnace. As a result, the respective conveying path for the particular substance can be adapted to it as optimally as possible at least in sections. The adaptation of the conveying path is usually conditioned by the properties of the substance to be conveyed, such as temperature, lumpiness, former reactivity, wear behavior, etc.

With regard to an outlet-side mouthpiece, it is advantageous that with completely separate conveying paths for different substances, the substances separate from each other, but directly adjacent emerge from the discharge device, so that they can be introduced through the same furnace opening in the oven. Thus, no modifications to the furnace are required. This represents a space-saving solution.

In a particularly advantageous embodiment of the invention, the conveying path between the at least two containers and the furnace has a first conveying path section with at least two separate conveyor path branches for the first and at least second material and a second conveyor path section common to the first and at least second material the second conveying path section is shorter than the shortest of the at least two conveying path branches. This is particularly advantageous applicable to a Y-shaped part of the discharge device. However, there could be more than two separate Förderwegzweige. Furthermore, there may also be multiple branches of the conveying path. By the

Use of separate Förderwegzweigen for the first and at least second substance, they can be transported separately separated as long as possible. Associated with this, optimal transport conditions for the first and at least second substance in the separate conveyor path branches can be realized. Through the common conveying path section, which preferably comprises the mouth piece, the technical see effort in the introduction of substances in the oven be kept low.

It is particularly advantageous that the common Förderweg- section is at most half as long as the shortest of the separate Förderwegzweige. As a result, the common conveying path of the at least two substances is separated on the one hand as long as possible from each other, but on the other hand, the technical complexity of introducing the substances into the oven is kept low. Such a design of the conveying path on the one hand ensures that the substance reaches the furnace in the desired state, i. For example, for hot sponge iron in the unoxidized state, and on the other hand, no furnace conversion is required to implement a feed device in such a configuration.

Further advantages of the invention will become apparent from the following embodiments, which are shown schematically with reference to the following drawings. Show it:

1 shows a schematic representation of an extract of a feeding device in a first embodiment and in a first discharge position,

2 shows a schematic representation of a charging device in a first embodiment in a second discharge position,

3 shows a schematic representation of a charging device in a second embodiment in a first discharge position,

4 shows a schematic representation of a charging device in a second embodiment in a second discharge position.

1 shows a charging device for an electric arc furnace 2 in a discharge position Al. In the discharge Al position can be supplied to the electric arc furnace 2 by means of the feeding device material for producing a molten metal. The feed device comprises a conveying path 1. The conveying path 1 extends, for example, from a direct reduction plant, not shown in FIG. 1, for hot sponge iron up to the electric arc furnace 2. Furthermore, the conveying path 1 extends from a lime and / or coal deposit or a cold storage Iron sponge or sponge iron briquettes to an electric arc furnace 2. On the conveyor 1 thus required for the production of a molten metal substances to the electric arc furnace 2 can be fed.

FIG. 1 shows a feed device 3 designed as a conveyor belt, by means of which a substance can be fed into a container 4. This substance may be, for example, at least one of the group cold sponge iron, sponge iron briquette, coal or lime. Furthermore, FIG. 1 shows a feed device 3 'in the form of a closed chute by means of which substance can be fed into a container 5. The substance to be introduced into the container 5 is in the exemplary embodiment hot sponge iron, which is provided directly by a direct reduction plant. The container 5 therefore has a refractory inner lining 10. The inner lining prevents damage to the conveying path construction, in particular the container constructions, which are made of steel, for example, due to the high temperatures.

Of the containers 4 and 5, the discharge device 6 extends to the electric arc furnace 2. The conveying path 1 between the containers 4 and 5 and the electric arc furnace 2 has a common conveying path section 13 in which substances from the first and second containers 4 and 5, respectively be promoted together. In addition, the conveying path 1 between the two containers 4 and 5 and the furnace 2 comprises two Förderwegzweige 11 and 12, which extend from the respective container 4 and 5 to the common conveyor section 13 separated from each other. Preferably, that conveying branch, in which the hot directly reduced sponge iron is promoted, designed such that it is promoted directly direct reduced sponge iron in the electric arc furnace 2.

The feeding device 3 ', the container 5 and the conveyor branch 12 extending from the container 5 to the common conveying path section 13 have protective gas supply means 7. The protective gas supply means 7, which are designed as nozzles for example, serve to supply protective gas into the conveying path in which hot sponge iron is transported or stored. The protective gas supply device is connected to a protective gas delivery system or circulation system, from which protective gas is continuously supplied for supply into a corresponding conveying path region.

Preferably, the conveying path areas acted upon with inert gas are provided with a slight gas overpressure, so that no air reaches the corresponding conveying path area even in non-tight places, but protective gas emerges instead. This avoids that the hot sponge iron on the way from the direct reduction plant in the electric arc furnace oxidized again. The protective gas, preferably nitrogen or argon, passes through the feed in the conveying path in the furnace 2 and is sucked there by means of a dedusting system, not shown.

The common delivery section 13 comprises a mouthpiece 14, which is detachably connected to the rest of the discharge device. The mouth piece 14 is preferably connected to the rest of the discharge device by means of a detachable flange connection.

The length of the common conveying section 13 of the discharge device 6, which can also be referred to as a common conveying branch, is not longer than half of the shorter conveying branch of the two conveying branches 11 and 12 in the exemplary embodiment. The shorter or shortest conveying path branch between the containers 4 resp 5 and the furnace is in the present As a result, it is possible to separate the substances from each other as long as possible, whereby the removal device 6 or the separate delivery branches 11 and 12 encompassed by the removal device 6 can be adapted to the respective substance to be transported. Further, however, only a single opening is required to introduce the various substances into the electric arc furnace 2.

The length of a conveying branch 11 or 12 is measured at the

Length of its conveyor branch segments. Thus, the conveying branch 11 in FIG. 1 has three conveying branch segments, which are not designated in greater detail. The lengths of these conveyor branch segments, however, are labeled Ll, L2 and L3. The sum of the lengths L1, L2 and L3 gives the length of the conveying branch 11. The conveying branch 12 is made up of two conveying branch segments. The length of a conveying path branch 11 or 12 is not specified in the figures middle fiber of Förderwegzweigs together, which jew. A length L4 or L5 is assigned. The sum of the lengths L4 and L5 gives the length of the conveying branch 12. It is clear from FIG. 1 that Ll + L2 + L3> L4 + L5. Therefore, the conveying path branch 12 is the shortest conveying path branch.

In the embodiment shown in FIG. 1, the length is

L6 of the common conveying section 13 is shorter than half of the shorter conveying branch of the discharge device 6. Thus, the inequality L6 ≦ 0.5- (L4 + L5) applies.

1 further shows that the discharge device 6 comprises a Notab- throw segment 22. In the discharge position Al, the emergency release segment 22 is closed by a closure element 21. The closure element is preferably spatially fixed. By such a closure element 21 prevents, for example, protective gas or dust from the discharge device 6 escape or other undesirable substances on an open Notabwurfsegment enter the discharge device 6 and so could contaminate the molten metal. Furthermore, the discharge device 6 of the dargstellten in Figure 1 charging device is rotatably formed. The axis of rotation runs vertically through the center of the container outlet opening of the container 5. The rotation is realized by means of rotation 23. By virtue of the rotatability of the discharge device 6, it is possible to move the discharge device 6 from the throwing position A1 by turning about the said axis of rotation Shedding position A2, the emergency shedding position, to be transferred. By Notabwurfsegment 22 it is possible to carry out of two containers 4 and 5 in both discharge positions Al and A2 substances.

In order to avoid a discharge of substance from the container 4 during pivoting, the outlet opening of the container 4 can be closed with a slide 20. This is closed before the Förderwegzweig 11 is pivoted away and opened again after the Notabwurfsegment 22 is disposed below the container outlet opening of the container 4.

In Figure 2, the charging device in the discharge position A2, ie the Notabwurfposition shown. In the emergency discharge position A2 of the discharge device 6, all substances arranged in the container 4 or in the container 5 are discharged into an emergency reservoir. This is possible because the emergency discharge segment 22 in the emergency discharge position A2 takes over the discharge of substance from the container 4 from the delivery branch 11. In the emergency release position A2, the free end of the conveying branch 11 with the spatially fixed closure element 21 is closed.

The emergency reservoir into which the substances are removed from the conveying path is not shown in FIG. In the embodiment, the discharge device 6 is pivoted by 180 ° to adjust the Notabwurfposition. However, a 180 ° rotation of the discharge device is not absolutely necessary. Rather, other angle settings for the discharge between Ofenabwurfposition Al and Notabwurfposition A2 can be provided. During the pivoting of the discharge device 6, the exit line preferably moves. term mouth of the discharge device 6 in a plane, in particular in a horizontal plane. The other embodiments of the charging device according to FIG. 1 apply analogously to the charging device shown in FIG.

3 shows a schematic representation of a charging device in a similar configuration as in FIG. 1. The charging device in FIG. 3 is likewise located in the discharge position A1, but differs from the charging device in FIG. 1 in the way in which substances are introduced into the containers 4 and 5. For in FIG 3, both the container 4 and the container 5 can be filled by means of the feeder 3. This is made possible by an adjustable switch 8, by means of which the flow of material - coming from the supply device 3 - can be controlled. The container 5 is also filled by means of the separate or additional feeder 3 '.

In particular, the switch 8 is a gas lock 9 nachgeord- net, which is designed as a double pendulum flap. The gas lock 9 is expediently associated with that container in which a certain atmosphere, preferably an inert gas atmosphere, is to be maintained. Thus, the double pendulum flap in FIG. 3 is preferably assigned to the container 5. The container 5 further comprises a refractory inner lining 10. On the one hand hot sponge iron can be stored in the container 5 by the refractory inner lining 10, on the other hand, a leakage of inert gas from the container 5 or entry of air into the container 5 via the switch 8 is substantially avoided by the gas lock 9.

The feeding device 3 shown in FIG. 3 makes it possible to redirect substances into different containers without much effort. The use of such a feed device 3 is particularly advantageous if, for example, hot sponge iron is not always available. If no hot sponge iron can be used, the container 5, which originally designed for hot sponge iron, now, for example, for cold sponge iron lime or coal can be used. Iron sponge briquettes, which can cause a high Förderwegabrasion - significantly higher than, for example, for lime, coal or CDRI - are then preferably stored in the container 4 and discharged from this in the electric arc furnace 2.

The use of the container 4 can, for example, also be completely dispensed with if neither hot sponge iron nor iron sponge briquettes are to be conveyed into the furnace 2.

By such a feeder 3, on the one hand, the feeder can be used flexibly, i. in the present case, the container 5 can be used for hot sponge iron, for example, for cold sponge iron, lime and coal, on the other hand, the wear on the feeder can be reduced. The plant availability is thus increased.

FIG. 4 shows the charging device shown in FIG. 3 in the emergency release position A2. In this case, as in FIG. 1, the discharge device 6 is rotated about the vertical axis passing through the center of the container outlet opening of the container 5. In the emergency shedding position A2 of the Abführein- device 6 all substances from the containers 4 and 5 can be removed simultaneously.

For pivoting a discharge device 6 between a Ofenabwurfposition Al and a Notabwurfposition A2 also other pivot points or axes of rotation can be set, as shown in the embodiments. Not only can pivot points be arranged differently, but also translation movements can additionally be provided. However, the transfer of a discharge device 6 from a kiln discharge position of the discharge device into an emergency discharge position of the discharge device 6 - and vice versa - should be as simple as possible. Contrary to the exemplary embodiments, charging devices with more than two containers can also be provided, for example three, four or five. However, in order to keep the number of containers limited, it is convenient, depending on the substances to be used to give substances with similar properties, for example, all with low temperature or with similar abrasion in a container, while another substance with separate from the remaining substances distinctive characteristics, such as temperature or abrasion behavior, is filled in a remaining container. In such considerations for the efficient utilization of the container is preferably first the temperature of a substance to consider, then only the abrasion behavior of a substance.

Claims

claims

1. A device for feeding a furnace (2), in particular an electric arc furnace, with materials for producing a molten metal, with at least one conveying path (1) along which a first material and at least a second material are supplied to the furnace (2), characterized in that the conveying path (1) comprises a first container (4) for intermediate storage of the first substance and at least one second container (5) for intermediate storage of the at least second substance, a feed device (3, 3 ') for feeding at least one of the substances into one Container (4, 5), and a discharge device (6) for discharging at least one of the substances from its container (4, 5) in the oven (2).

2. Device according to claim 1, characterized in that the discharge device (6) between a first discharge position (Al) in which substances in the furnace (2) can be discharged, and a second discharge position (A2), in the substances not in the oven (2) are deductible, is pivotal.

3. Device according to claim 2, characterized in that in the first and the second discharge position (Al, A2), the discharge of substances from at least two containers (4, 5) is possible.

4. Device according to one of claims 1 to 3, d a d u r c h e g e k e n e c e s in that a conveying gas at least in sections can be supplied to the conveying path (1).

5. Device according to one of claims 1 to 4, characterized in that the conveying path (1) is at least partially formed depending on a substance to be conveyed such that the fabric a reached predetermined minimum speed, but does not exceed a predetermined maximum speed.

6. Device according to one of claims 1 to 5, in that a conveying path (1) is formed at least in sections in such a way that a material that tends to agglomerate can be conveyed in an agglomerated state.

7. Device according to one of claims 1 to 6, in that a feed device (3, 3 ') has a switch (8) by means of which a material can optionally be fed to one of the at least two containers (4, 5).

8. Device according to claim 7, characterized in that the switch (8) is arranged downstream of at least one gas lock (9).

9. Device according to one of claims 1 to 8, d a d e r c h e c e n e c e in that at least one container (4, 5) has a refractory inner lining (10).

10. The device according to claim 1, wherein the discharge device has an outlet-side orifice piece, which is detachably connected to the remaining discharge device.

11. The device according to one of claims 1 to 10, characterized in that the conveying path (1) between the at least two containers (4, 5) and the furnace (2) for the first and the at least second material at least sections separated from each other Förderwegzweige (11, 12).

12. Device according to one of the 1 to 11, characterized in that the conveying path (1) between the at least two containers (4, 6) and the furnace (2) has a first Förderwegabschnitt with at least two separate Förderwegzweigen (11, 12) for the first and at least second fabric and a second, for the first and at least second fabric common Förderwegabschnitt (13), and that the second Förderwegabschnitt (13) is shorter than the shortest of the at least two Förderwegzweige (11, 12).

13. The apparatus of claim 12, wherein a common conveying path section is at most half as long as the shortest of the separate conveying path branches.