MXPA00001977A - Device for producing sponge iron - Google Patents

Abstract

A device for producing sponge iron from iron oxide lumps consists of a reduction shaft in which a hot dust laden reducing gas is delivered. Said gas is produced in a gas generator by means of partial oxidation of solid carbon carriers and passes into the lower end of the reduction zone via lateral reduction gas inlets. The iron oxide lumps are fed to the upper area of the reduction shaft and are radially fed as sponge iron to the lower end of said reduction shaft via delivery organs (3). An additional delivery organ for sponge iron is provided within the middle area of the reduction shaft. The additional delivery organ is situated downstream from the surfaces in the reduction shaft base (2), said surfaces being configured between the inner ends of the delivery organ. In addition, a guiding device (6) is arranged between each of the two delivery organs and projects upwards above said organs in such a way that the sponge iron which is falling downwards is guided laterally to the delivery organs and radially to the additional delivery opening. Feed spirals are preferably used as delivery organs. One advantage of the guiding device is that it has an upper edge which runs in a diagonal manner from the additional delivery opening end up to the reduction shaft inner wall and it can be effectively enlarged downward and radially outwards to the width of the facing space between the delivery organs.

Description

APPARATUS TO PRODUCE SPONGE IRON The invention relates to an apparatus in accordance with the preamble of claim 1.

In the reduction of iron oxide lumps in a reduction well, the produced sponge iron is supplied to the lower portion of the reduction well. A possible method, described in patent EP 0 085 290 Al, for carrying out this supply consists of conducting by means of radially acting supply instruments, especially screw conveyors, from the end of the furnace with reduction well. Through the radial arrangement of the screw conveyors, there exist between the same lateral intervention spaces (dead areas) that widen towards the inner wall of the reduction well. On these areas with intervention space the areas without movement of the load moving down through the well increase, called "stagnation". It is also problematic to manufacture supply instruments of any size with respect to their REF: 32764 diameters and length for reasons of strength, usually even in the center of the reduction well, between the internal ends of the supply instruments (head in spiral) there is a dead area, in which a "stagnation" (central "stagnation") accumulates in the same way. The height of these "stagings" depends on the size of the respective intervention space area and the filling angle of the emptied cargo. In particular, with a large powder coating as a result of the powder content of the reduction gas, this filling angle is very excessive and the friction at the inlet is very large. The "stagnation" formed on the areas. of intervening spacing of the screw conveyors and the central "stagnation" can support another. "Stagnation" has a potentially harmful influence on the uniformity of the gasification of the charge and on the movement of the charge in the well and therefore on the uniformity of the reduction of the iron oxides.

The patent 0 166 679 Al describes an arrangement of a melting gasifier and a furnace with direct reduction well with a filling of iron oxide lumps where the furnace with well has a base to support the packed column, supply openings in the base for the supply of the sponge iron particles and at least one inlet for the reduction gas supplied from the gasifier into the lower section of the packed column. Since the reduction gas is heavily charged with dust, there is a danger that the free spaces in the packed column will become blocked with the consequence of a corresponding increase in the resistance to the passage of the reduction gas. In order to make it possible to supply even a gas loaded with a large portion of poivo from the gasifier directly into the furnace with reduction well, without the addition to the spaces in the packed column and consequently induce the uneven distribution of gas in the the furnace with well and therefore the stoppage of the operation, are radially placed screw conveyors to move, mutually and constantly, the backfill particles and forward in the region through where the reducing gas flows, adjacent at the inlet of the reduction gas, and in addition, at least one supply opening is placed at the opposite ends of the screw conveyors at the base. The drive of the screw conveyors can be carried out, the individual screws are rotated in succession in both directions, or a combination of screw conveyors is constantly provided outwards and inwards.

In this arrangement, the supply openings are plugged in relation to the packed column; on the outside by a shirt and on the inside by a cone. The ends of the cone are shortened above the screw conveyors or this contains entry openings where the internal ends of the radially placed screws are engaged. By this means it is ensured that the sponge iron does not reach the supply openings directly, for example without the additional transport instruments, but can only be transported to the openings by means of the screw conveyors. This is necessary in order to produce the inlet and outlet movement of the sponge iron.

Since the emptied load is also supported in the cone that covers the central supply opening, the "stagnation" is also likely here.

Patent Procedure EP 0 166 679 Ai, therefore it is an object of the present invention to create an apparatus for producing sponge iron from lumps of iron oxide in a reduction well using a hot reduction gas charged with poivo , which is produced in a gas generator by the partial oxidation of the carriers of solid carbon and is induced by the lateral inlets of reduction aids inside the well. of reduction at the lower end of the reduction zone, in this apparatus the iron oxide lumps are placed in the upper region of the reduction well and are supplied radially at the lower end of the well by the supply instruments, and in this apparatus provides an additional opening for the supply of sponge iron at the base of the reduction well in the central region of the reduction well below the area formed between the internal ends of the supply instruments, in this apparatus the accumulation of a "stagnation" "At least the area located in the center between the radial supply instruments is avoided.

This objective is achieved in accordance with the invention by the features cited in the characteristic part of claim i. Advantageous developments of the apparatus according to the invention originate from the dependent claims.

Because the supply instruments are provided to transport the iron sponge soio radiantly out, no. inward and the forward movement of the sponge iron takes place at the base of the reduction well and the central supply opening does not have to be covered, such that a "stagnation" can no longer form in the center nor substantially in a lateral manner between the supply instruments. Since also the loading material located above the side surfaces may not be supported in the central "stagnation", it is guided while sinking in the reduction well to a considerable degree of the opening of additional supply.

Advantageously, a guiding apparatus is provided between each two supply instruments and extends upwards between them, in such a way that the sinking sponge iron is guided laterally towards the supply and radiating instruments towards the opening of additional supply . By this, the achieved projection of the loading material towards the supply instruments and the additional supply opening is increased.

The guiding apparatuses preferably have an upper edge running obliquely from the edge of the additional supply opening towards the inner wall of the reduction well, and widens downwards and radiantly downwards towards the width of the lateral space between the supply instruments. By means of this it is ensured that all the loading material sinks uniformly downwards until it is supplied.

Through the discharge division within an external and central region, the sinking velocity in the outer diameter region of the well and in the upper region of the central supply can be controlled independently of one another. Thus - in conjunction with the individually adjustable feed rates of the supply instruments - useful control of the well action is possible over the entire cross section of the well.

Advantageously, a vertical well with a diameter is located below the additional supply opening. it is constant and corresponding to the diameter of the supply opening, the well closes at the lower end, and at least another iron sponge supply instrument, acting radially, is placed above the base of the well.

The invention is explained in more detail below with the help of the embodiments shown in the figures. These are: Figure 1 shows the lower portion of a reduction well in a perpendicular sectional view in accordance with a first mode, Figure 2 is a horizontal section through the furnace with reduction well in the II-II plane in the Fig. 1, and Fig. 3 is the lower portion of a reduction well in a vertical sectional view according to a second embodiment.

The Figures show the portion of the reduction well below the animation plane, for example the piano in which the gas is blown into the well in order to ascend therein through the load and originate the transformation of the iron oxides. in iron sponge.

The reduction well has a cylindrical or intermittent conical cover 1 joins with the lower end in the base 2. Directly above the base 2 a plurality of, for example 10, the lateral supply openings are placed so that the load containing the sponge iron, such that they are distributed evenly spaced in the direction of the perimeter along the length of the lining 1 on a horizontal plane. A supply instrument is guided through each of the supply openings in the form of a screw conveyor 3. The screw conveyors 3 convey the load which sinks into the base 2 radially outwards, such that the load respectively a descent pipe 4 a is guided through it, for example into a melting gasifier which produces the reduction gas. This supplied load makes possible the sinking of the load in the reduction well.

The radial screw conveyors 3 extend only over a portion of the radius of the reduction well, such that the spiral heads have a spacing from the axis of the well and form a circular area therebetween. Base 2 contains a central supply opening corresponding to this circular area and which joins a cylindrical well 5 with a corresponding reduced diameter in relation to that of the reduction well.

Above the base 2 there is located, between two corresponding screw conveyors 3, a wedge-shaped guide element 6. The front or upper edge of the guide elements extend from the edge of the central supply opening upwardly upwards towards the inner wall of the cover i, the angle of inclination of this edge relative to the vertical plane that is inclined 25 to 40 °. In addition, the guide elements 6, starting from this end, expand downwards and radiantly outwards, such that their areas that remain in the base correspond respectively to the dead areas between the two screw conveyors 3. The angle of inclination of the s The lateral surfaces of the guide elements 6 are located in the region of 5 to 15 °.

The guiding elements 6 guide the load that sinks in such a way towards the central supply opening in the base 2 and towards the screw conveyor 3 that practically supplies all the load without obstacles, for example, the appearance of "stagnation" is prevented. .

The portion of the load passes the central supply opening reaching the well 5 that closes in the lower part. In order to supply the material therefrom, directly above the base of the well 5 two supply openings are provided which are diametrically opposed to one another and through each with a screw conveyor 7 is guided to provide the supply to the drop pipe 8 which also, for example, projects towards the fusion gasifier. Since the diameter of the well 5 is significantly smaller than the reduction well, the screw conveyors 7 are taken out of the center of the well 5, respectively, so that all the loads entering the well 5 are transported without any blockage to the pipes of the well. decline 8.

Instead of the screw conveyors 8, supply instruments can also be provided at the base of the well 5, for example a lock in the form of a cellular wheel or a recovery receptacle in the shape of a wheel.

In the reduction well according to FIG. 3, there is, in communication with the central supply opening in the base 2, a well 9, the internal diameter of the latter decreases steadily downwards and is inclined immeasurably at the end. lower. The lower end of the well 9 is open, so that the load can emerge from it. This falls within a movable lever with pivot 10 which is placed in a chamber 11 with an outlet pipe 12. Depending on the amount of the load which joins the well 9, the pivoted lever 10 performs pivot movements and originates the discontinuous supply of the load to the outlet pipe 12.

The outlet pipe 12 is centrally located through a coal inlet nozzle 13 inside the head of a melt gasifier 14. The coal inlet nozzle 13 incorporates a vertical feed pipe from a coal receptacle and a conveyor Two-stage screw Through the concentric introduction of the filler material or iron sponge and carbon into the head of the melt gasifier 14, mixing is promoted together with the same, so that the melting of the sponge iron and the production of the reduction gas is improved in the melting gasifier 14.

It is noted that in relation to this date, the best method known by the applicant to carry out the said invention is that which is clear from the present invention.

Having described the invention as above, it is claimed as property and content in the following.

Claims (13)

1. The apparatus for producing sponge iron from lumps of iron oxide in a reduction well, using a reduction gas loaded with hot powder that is produced in a gas generator through the partial oxidation of the carriers of solid carbon and it is guided by means of the lateral inlets of the reduction gas at the lower end of the reduction zone within the reduction well, where iron oxide lumps are placed in the upper region of the reduction well in the apparatus and are supplied radially at the lower end of the well as sponge iron by. The supply conveyors are provided, and an additional supply opening for the sponge iron is provided at the base of the reduction well in the central region of the reduction well below the area formed between the internal ends of the supply instruments, characterized in that the instruments of supply are provided to transport the sponge iron only radially outwards.

2. The apparatus of claim 1, characterized in that a guiding apparatus is provided respectively between two supply instruments and projects upwardly therefrom, in such a manner that the downwardly sponging iron is laterally guided towards the delivery and radiating instruments. towards the opening of additional supply.

3. The apparatus according to claim 1, characterized in that the supply instruments are screw conveyors.

4. The apparatus according to any of claims 1 to 3, characterized in that the guide apparatus has an upper end that runs upward obliquely from the edge of the additional supply opening towards the internal wall of the reduction well.

5. The apparatus according to claim 4, characterized in that the angle of inclination of the upper edge of the guide apparatus inclines 25 40 'relative to the vertical piano

6. The apparatus according to one of claims I to 5, characterized in that the guide apparatus is broadened downwards and radiantly outwards to the width of the lateral space between the supply instruments.

7. The apparatus according to claim 6, characterized in that the angle of inclination of the lateral surfaces of the guide apparatus is inclined 5 to 30 ° with respect to the vertical plane.

8. The apparatus according to claims 1 to 7, characterized in that below the additional supply opening, a well with a decreasing diameter is placed, it remains equal or wider, where the well closes at the lower end, and at least in another supply instrument for the iron sponge, which acts radially, is placed above the base of the well.

9. The apparatus according to claim 8, characterized in that the additional supply instrument is a screw conveyor.

10. The apparatus according to claim 8, characterized in that the additional supply instrument is a cell wheel lock.

11. The apparatus according to claim 8, characterized in that the additional supply instrument is a wheel-shaped recovery receptacle.

12. The apparatus according to one of claims 1 to 7, characterized in that a vertical well with a decreasing diameter is located below the additional supply opening, where the well has at its lower end a supply opening for the iron sponge and widens inside the chamber with an outlet pipe, and where a moving beam is provided inside the chamber below the supply opening at the lower end of the well.

13. The apparatus according to claim 12, characterized in that the outlet pipe is guided through the outlet pipe to introduce the solid that carries the coal into the gas generator. S "SUMMARY OF THE INVENTION An apparatus for producing sponge iron from lumps of iron oxide consists of a reduction well in which a reduction gas charged with hot poivo is supplied. The gas is produced in a gas generator through the partial oxidation of the solid carbon carriers and is passed to the lower end of the gas. 10 reduction zone by means of the lateral inlets of the reduction gas. The lumps of iron oxide are increased in the upper area of the reduction well and fed radially to the lower end of the well as sponge iron. 15 means of the supply instruments. An additional supply instrument for sponge iron is provided in the middle area of the reduction well. The additional supply instrument is placed downstream of the surfaces in 20 the base of the reduction well, the surfaces are configured between the internal ends of the supply instrument. In addition, a guiding apparatus is placed between each of the two supply instruments and is projected 25 so that the downwardly falling sponge iron is guided laterally towards the supply instruments and radially towards the additional supply opening. Spiral feeders are preferably used as delivery instruments. An advantage of the guiding apparatus is that it has an upper edge that runs diagonally from the additional opening end to the inner wall of the reduction well and can effectively elongate in a downward and radially outward manner to the width of the space between the instruments. supply