DE1758645B1 - Dust collecting device for a pig iron ladle - Google Patents

Description

From the United States patent specification 3,083,957 a cover hood for converters is known, which e.g. in steel production, also due to the refining of the pig iron, and the considerable dust Supply of fresh air or oxygen collects and removes combustion products. This known cover is therefore for collecting the already only when pouring pig iron in dust created in a container is not suitable because it does not have a filling opening for the pig iron and as such also not the opening provided in the known device for the supply of Fresh air and additives serving for iron or steel refinement can be used, as with one the filling of pig iron into the container enables a sufficient cross-section of the opening through this a considerable part of the dust created when pouring the pig iron escape would.

A similar arrangement is also known from US Pat. No. 3,013,789, in which iron or Steel, which is in a liquid state in a relatively large container wagon, on its way off Refined blast furnace to the ladle at a blowing station by supplying oxygen or fresh air, So it is primarily decarburized. For collecting or sucking up the resulting from the freshening Solid and gaseous combustion products, in turn, a cover is provided, which is extends over the openings of the container trolley. However, this known cover also has There is no opening that allows pig iron to be poured into the container car while at the same time on the openings of the container trolley remaining cover allows.

Additional ones provided at blow stations and for collecting or sucking up the material when refining metal The resulting dust covers are also from the Austrian patent 245012 and the German patent application D 9358 VI / 18 b known. Also these well-known facilities however, do not allow suction or collection of the just pouring pig iron dust created in a container.

From the Belgian patent 667 678 finally a suction device for blowing Exhaust gases produced by metal in a converter are known to have an exhaust hood over the opening of the converter, in which an escape of converter gases with the aid of an additional air flow should be avoided between the converter opening and the extraction hood.

Although the dust-collecting device according to the invention also features some of the features that are known per se are used, is a considerable one precisely because of the combination of these and other features to achieve technical progress over comparable devices.

The special design of the sidewalls also has a corresponding shape Shaping of the used ladles matched hood, which has a filling opening and has an outlet opening for the resulting dust to the side, a safe and almost complete one Elimination of the dust already created when pouring pig iron is guaranteed without this the simple pouring of the pig iron in, which does not require any special protective measures the ladle is obstructed. Especially compared to those previously proposed to solve this problem Measures in which a casting ditch receiving the casting ladle is completely or at least to a large extent had to be covered in order to ensure a safe escape when pouring Preventing pig iron from dust arising in the ladle is with the dust collecting device according to the invention a much easier handling of the ladles possible, since this is possible with z. B. unchanged at the filling position of the ladle moving hood and for processing the pig iron located in the ladle z. B. lifted out of the casting ditch by a crane can be.

In the following drawings, two exemplary embodiments of the invention are shown. Show it

F i g. 1 and 2 schematically a plan view and a longitudinal section through a dust collecting device,

F i g. 3 is a cross-sectional view of a second embodiment with an air curtain generating device Establishment and

F i g. Figure 4 is a perspective view of a hood suspended on a trolley.

In Fig. 1 and 2 are 1 vessels that are rotatably mounted on carriage 2 and along rails 3 of a blast furnace, not shown, can be moved to each end of a casting ditch 4. 5 is a transportable ladle which is detachably mounted on a carriage 6 and which moves along rails 7 which are laid out on the floor of the casting ditch 4. 8 illustrates a carriage that can be moved along rails 9, which are laid on the top of the casting ditch 4. 10 is a on the carriage 8 suspended hood, which on its side wall with an outlet 11 for the discharge of Dust is provided. 12 is a suction line with branch lines ending in ports 13, the extending through the side wall of the casting ditch 4 and in alignment with the outlet 11 of the Hood 10 can be brought, wherein the branch lines of the suction line 12 with slides 14 are provided.

The two transport vessels 1 can be rotated open mounted on the carriage 2 and can be moved left and right to two filling stations of the casting trench 4.

The hood 10 is provided on its top with a filling opening 15 through which the liquid pig iron is poured. The lower end 16 of the side wall of the hood 10 and the upper end 17 of the side wall of the ladle 5 are designed so that they can be brought into alignment with one another. In the embodiment shown, the lower end 16 of the side wall of the hood 10 and the upper end 17 of the side wall of the ladle 5 matching, step-shaped edges on one side, which allow the hood to be moved sideways in relation to the ladle.

The hood 10 is brought into engagement and disengagement from the ladle 5 by the to the Carriage 8 suspended hood 10 along the rails 9 or the ladle mounted on the carriage 6 are moved along the rails 7 relative to one another. The cars 6 and 8 are each from driven by an electric motor (not shown).

The carriage 8 is a lattice-shaped framework,

on which the refractory lined hood 10 is suspended.

The opening 15 of the hood 10 is on its side edges provided with two protective cover plates 18, which are opposite and divergent to the Upper wall of the hood 10 are inclined to the distance between the upper edges of the cover plates 18 to enlarge (see also Fig. 3).

A device 19 for producing an air curtain, as shown in FIG. 3 and 4 can be provided in order to prevent the dust from escaping through the opening 15.

1 sheet of drawings

Claims (2)

1 2 1. The area of the opening of the Gießgrabens is so claims: large, _a ß d the lid is also large and is easily subject to thermal deformation. 1. Dust collecting device for collecting 2. The rotatable or horizontally slidable when filling liquid pig iron from a 5 lid, the device is very large, pig iron coming from a blast furnace 3. The rotatable or slidable lid, the holder in a transportable, within one is moved in order to open the casting ditch. Casting trench, which is assigned two filling stations, takes up a considerable amount of space Dust created by the pouring ladle, thereby hindering the work that takes place in the marked that one in its upper io space near the pouring ditch and other- Wall for filling the liquid pig iron with rer parts of the device must be carried out a slot-like filling opening (15) and at its sen. Side wall with an outlet (11) for the object of the invention to provide a dust collection Filling in the dust provided, decreasing direction of the type mentioned at the beginning for one two face hood (10) is provided that the pouring ditch having 15 filling positions to be developed the hood and the ladle (5) are not. common radial surface (16,17) unilaterally stepped The object is achieved in that a like, a lateral displacement of the hood (10) rer upper wall for filling the liquid Roheizulassend is designed that for each filling sens with a slot-like filling opening and at its Place one with the outlet (11) when the side wall is in place with an outlet for the filling process Removable hood provided with a hood that covers the suction to be brought into contact with the dust End (13) of a line (12) is provided that the side wall of the hood and that on the longitudinal edges of the filling opening and the pouring ladle common radial surface is one (15) the hood opposite each other two tig step-like, a lateral displacement of the hood Protective covers (18) are provided, which is designed to allow the 25 that for each filling station Filling opening widening upwards in a funnel shape and decdiverging with the outlet when the hood is on. Suction connection to be brought about in a line 2. Dust collecting device according to claim 1, is provided and that on the longitudinal edges of the filling thereby characterized in that the hood (10) has an opening of the hood opposite to each other two the escape of dust through the filling opening 30 protective covers are provided that the filling opening (15) preventing device (19) for generating funnel-shaped divergence widening upwards having an air curtain. ren. Although a container for refining pig iron is known from German patent specification 174777, 35 of a treatment of what is in him immediately of pig iron filled into a blast furnace by supplying fresh air with simultaneous rotation of the container to the effect of centrifugal force on the raw The invention relates to a dust collecting iron. The pig iron gets through device for collecting when filling 40 a closable filling opening into the container, Liquid pig iron from one of a blast furnace and one that extends vertically upwards Has pig iron container in a transportable, kende outlet opening. After filling The filling opening of the container becomes two filling stations for the pig iron within a casting ditch orderly ladle to remove dust. closed, the container then in revolutions Up to now it has been customary to prepare a casting ditch - 45 offset a vertical axis of rotation and walk in it, into which the ladle is introduced, after which sensitive pig iron gases and preferably air in the molten pig iron in the blast furnace supplied in such an amount that it is both for coming transport vessel from this in the casting decarburization of the iron as well as for the combustion of the pan is poured. To the gases evolved from graphite, iron is used. The one with this decoction oxide etc. to collect existing dust, the gas in the 5 ° ventilation and combustion process The pouring ladle introduced into the casting ditch produces shaped and solid combustion products it has already been proposed that the casting grave escape via the outlet opening, which quakes during the to be covered with a lid that had an opening through the filling opening has, by which the molten pig iron can be replaced from. The escape of dust and the vessel coming from the blast furnace into the casting 55 combustion gases through the inlet or else pan is poured, the lid rotatable outlet opening is therefore of the filling process of the or slidingly mounted in order to always separate the casting ditch to the container with pig iron, so open and pour the ladle into the casting ditch! that suction or collection of dust that occupy or to be taken from it. already when pouring the pig iron into the container Such a device could only occur at 60, in the known device only as considerable difficulty in such an unwanted and probably not even realized Type of casting ditch used in which the byproduct to even a minor extent Ladle alternately to two, each occurring at one. So a large part of it will end up when pouring of the pouring trench arranged by the standing dust during pouring is moved where the molten pig iron in the 65 of course open filling opening or a coming from the blast furnace pig iron container in the intended for piercing the blast furnace and as The pouring ladle is poured in, namely from the fol- eye opening formed, closable opening Reasons: soft.