DE1508143A1 - Method and device for burning off slag or melt residues in the mouth areas of metallurgical vessels - Google Patents

Description

DEMAG Aktiengesellschaft, Duisburg, February 16, 1966

Fl / Me - 5081 -

Method and device for burning off slag or melt residues in the Muzzle areas of metallurgical vessels

The invention relates to a method and the burn-off device required to carry out the method of slag or melt residues in the mouth areas of metallurgical vessels, in particular Converters, ladles or the like.

It is known that the so-called bears on metallurgical vessels, which are slag or melt residues, remove by repelling. Depending on the strength of the connection between these bears and the refractory lining or the edge of the vessel mouth, the increase in its own weight contributes to the fact that it is thrown off by itself will. However, in most cases the mass of the slag residue exceeds the permissible weight, so that the independent loosening cannot be waited for.

With such large bears, which increase in weight from 20 to 30 tons after a larger number of batches blow breaks are used to burn the bears down. For example, come for this Consider periods of time that are required for cleaning or inspection work, also for changing the blower lances, are provided.

You have to rely on using oxygen burners to divide the bears, cut them open and cut into individual ones

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Repelling pieces. For example, manwn Hand individual radial cuts into the bulbous Coverings of the mouth area. Subsequently it is necessary to use crowbars or the like. The final To cause loosening. Powder oxygen lances are also known ("Der Bauingenieur", 1957, pages 221 to 225) to melt individual holes in the bears with them. So are opposite to the oxygen Flame cutting achieved no further advantages, because the bears were given mechanical tuition here as well can be completely resolved. Burning the bears completely with oxygen burners is a considerable one It takes time to free a vessel from the clinging slag residue.

If the number of batches in the steelworks is not to be reduced, one has to rely on making use of the period of the blowing breaks. The operating personnel must therefore be able to remove bears of different adhesion or different weight in short periods of time. It is not without risk to carry out this type of work under the pressure of time and with the possibility of unforeseen repercussions. The known methods of eliminating the bears are then fraught with deficiencies in the lengthy, cumbersome treatment, the dangerous handling in the area of still hot vessels. However, it is not only the question of safety, but also the economic side that makes it easy to see that the known methods can be improved. In addition, there is the technical requirement to remove the bears thoroughly, evenly and independently of the skill of the staff at the desired ■ point in time. The vessels should be available in good time for the next batch. 909843/0703

February 16, 1966 Fl / Me - 508l -

It is not possible to \ predict at what point in time Burning down the bear may be required. This question is to decide whether the heavy weight affects the tilting movement, for which the drive must be designed in terms of performance. There it comes then to operational disruptions if the bears exceed the permissible weight. Then it is imperative eliminate the bear quickly and safely.

The present invention is therefore based on the object of showing a method that bears faster and safer to remove than before.

The solution to this problem is, according to the invention, that a plasma jet of high temperature in oscillating or circular motion is guided in a fixed path around the mouth of the vessel. Such a beam of high energy density is capable of producing melt and slag residues in a short time hard and unyielding structure of the bear to penetrate, so that in a single, the mouth moving around the loosening of the bear can happen. The advantage here is that you are no longer on the skill of the operator is required, but a geometrically perfect cut receives. You can, for example, the focal beam at such a distance from the muzzle jacket or the muzzle liner cause the bear to collapse after the end of the cut, or at least in one Ring from the mouth. Can be easily lifted off. While the known oxygen cutting processes have the disadvantage that the cutting gap melts again and again, the plasma jet has the advantage of being larger Heat, so that no sticking αεε gap can be recorded but the melt gap is blown clean, d. H. the separation is clear.

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In an embodiment of the method, the plasma torch beam is essentially parallel with its beam axis led to the mouth cone. For particularly strongly adhesive Approaches there is thus the possibility of melting the bear in several positions or even in the In the most difficult cases, in which the bear sits unevenly around the circumference, a weight reduction sufficient to continue operation under the desired conditions.

In a further embodiment of the invention, the plasma jet is guided with its beam axis essentially parallel to the edge of the mouth. Since the bear too grows beyond the mouth edge, it is advantageous to work across the mouth axis in such cases, with which peculiarities of the vessel mouth or the melted material can be accommodated. Depending on these prerequisites, a special cross-sectional shape of the slag approaches is formed, see above that, based on previous experience, it is expedient to choose this angle setting.

According to a further feature of the invention, the procedure is such that the plasma jet in the mouth interior is guided along the refractory lining. According to the findings made in practice, are liable the bears also on the inside of the mouth, so that it is advisable to drive along the lining, the heat resistance of the lining being the same Suggestion particularly accommodates.

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To carry out the method according to the invention, a device is proposed which is provided by an in a closed path movable carrier for a plasma torch is characterized, the ideal or physical axis of rotation approximately coincides with the converter round axis. It is by means of this path possible to drive very precisely along the jacket or putter of the converter mouth, so that the least possible Remaining wall thicknesses of the bear can be achieved, so that the collapse of the often ring-shaped approaches is effected.

According to the further invention, the carrier for the plasma torch is on a horizontal path movable vehicle arranged. The converter stage is expediently available for this purpose or else Platforms located higher up so that the entire device can be quickly moved into the operating position is and thus other facilities, such as Miildenkippvorrichtungen, charging machines or the like., and overall does not stand in the way of operation on the converter stage. Also offers a such a vehicle the possibility of protecting and compactly accommodating the entire device and to wait during breaks in operation.

According to a further feature of the invention, the support for the plasma torch can be moved by means of a rotary engine. Due to this design, it is not applicable any manual activity, such as moving the plasma torch by hand, d. H. multiple workers tie with this device. Still secures

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the rotary drive ensures an exact cut and the ability to adjust the feed speed accordingly to be able to regulate the strength of the bear easily.

Kerr for the invention further 1st that the carrier for the plasma torch means arranged on the vehicle in the vertical adjustment drives web and forth pivotably drivable by means of a further adjusting device in the direction of GefSßmUndüngsachse and forth. The pivotability primarily serves to follow the position of the main axis of the converter, but also to generate a movement corresponding to the shape of the mouth of the vessel, so that superimposed movements can also be carried out by means of this device. In the direction of the vessel axis it is necessary to proceed if, on the one hand, the basic setting is to be made and, on the other hand, the fact that the thickness changes over the circumference makes readjustment appear advantageous.

However, it is also a to-and-fro movement a particularly intensive fusing of the burning cavity assigned.

A further improvement of the invention can be seen in the fact that the carrier for the plasma torch is arranged on an extendable arm connected to the vehicle, on which a lifting and / or Pivoting movement is transferable. It is assumed that, depending on the existing system, converter vessels should be freed from the bears in an inclined or horizontal vessel main axis position, as well as this work

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must also be carried out with the main axis of the vessel in a vertical position, it is advisable to carry out the basic setting by means of the extendable arm. The plasma torch is to be brought into the operating distance with the stroke movement in the vertical position of the vessel axis. A perfect central location of the
The carrier axis of rotation is achieved when the carrier located above the vessel mouth can be pivoted horizontally in such a way that the vessel mouth waxes and the carrier axis of rotation exactly coincide.

In order to counteract all special cases of the formation of bears, it is advisable to look for a
Another feature of the invention to run the device so that the carrier is arranged adjustable in such a way that a cone jacket can be written on by means of the plasma jet, the vessel transversely to the
Mouth axis brushable 1st and / or radial individual cuts can be carried out.

If the burning time of the bear is to be shortened even further, or if the reasons for the diameter of the vessel orifice are decisive, it is advantageous that according to the invention
two opposite, on the circumference of the closed path or several evenly over the circumference
distributed supports for plasma torches are provided. Each of the carriers then only works
part of the mouth.

There are several exemplary embodiments in the drawing
of the invention shown schematically and explained in more detail below:

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Pig. 1 shows a converter in an inclined position and the converter according to the invention on the converter platform Contraption.

Pig. 2 represents the to Pig. 1 corresponding floor plan dar ..

Fig. 3 is a second embodiment, such as Fig. 1 shows in elevation. The converter is in a vertical axis position.

Pig. 4 represents the top view of Pig. 3 represents.

Fig. 5 shows a third exemplary embodiment in which the converter is in a horizontal axial position is freed from the bears.

In FIG. 1, the converter 11 with its mouth 2 has been tilted diagonally against the converter platform 3 or a similar platform and the vehicle 4 is already in the working position in order to remove the slag or melt residues 5. For this purpose, the vehicle 4 carries a swivel table 6 which, for example , is mounted swiveling about the axis of rotation 8 by means of a hydraulically actuated piston engine 7 11 can be moved in the direction of arrow 12 and also holds the actual carrier I ^ of the plasma torch 14. In front of the carrier 13 there is expediently a heat shield Ij5a in order to protect the device from the residual gases which are still leaving the converter mouth at this point in time rotatably mounted on the slide 9 in bearing blocks 9a and can be set in rotational movement via the gear 15 with a continuously variable drive l6.

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The vehicle can be trackless or rail-bound. 3s is controlled via a non-illustrated self-propelled, proceed from the state 17 from the position shown. The positioning can take place at any desired point in time when the converter blade 3 has been cleared.

The rotating spindle l8 for the firing carrier 13 is located in their interior opposite poles 19 * which after entering the Converter mouth 2 swiveled out in the direction of the arrow 20 (FIG. 2) can be. It is therefore possible to use directly working burners as well as indirectly working, d. H. Burners that do not require a separate opposite pole. The plasma torch 14 has Supply lines 21 for equipment such as working gas, natural gas, coolant, electrical energy, which on a Roll 22 can be wound up so that rotary movements in both directions of rotation are possible.

In the exemplary embodiment according to FIGS. 3 and 4, the vehicle 4 is on the converter platform 3 with a corresponding Control cable controllable from a distance. These leads are not shown because they are do not belong directly to the essence of the invention. The vehicle 4 has a drive motor 23, which over Gear 24 to raise or lower the table 25 is able. These directions of movement are marked with '26 designated. On the table 25, the carriage 9 is in turn mounted and by means of the piston engine 10 in the Directions 12 movable. An electric drive 27 serves as the rotary drive for the burner support 13. whose continuously variable transmission 28 has a bevel

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Drive 29 has «via the traction means 30 dl · Movement is transmitted to the axis of rotation Ij5a dee carrier 13. The carrier 13 is attached to an arm 31 , de? FGT is connected to the part of the table. 9 The plasma torch 14 has a feed 32 linked to it for the operating means such as electricity, gas and cooling water. In order to enable the rotational movement of the plasma torch 14 with the carrier 13, the feed 32 is pivotably mounted at 33. The pivoting out is only equal to the diameter 34 of the plasma torch 14 moving on a circular path.

i * Arm ^ u can also use the feed 36 be supplied with cooling water.

In Pig. 5 is a further exemplary embodiment of FIG Converter I tilted with its main vessel axis la in a horizontal position. The vehicle 4 has a drive 37 equipped, the vehicle in a precise distance to the Able to bring converter mouth. In stock 38 a support arm 39 is also attached, in the interior of which there is a bearing 40 of a shaft 4l, on which front end, as already described, opposing poles 19 are hingedly attached, according to the exemplary embodiment shown are provided with spring-loaded claws 42. In the area of the rear he carries the shaft 4l a drive wheel 43, which has its drive

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movement, as well as the plasma torch 14 itself, over a rotary motor 44 receives whose rotary feed can be regulated within limits. If you turn on the rotary motor, so the plasma torch moves ^ 14 when stationary, in the bear clawed u-aenpolen 19 in one circular path until the movement over the limit switch 45 is interrupted or switched off as a speed limit.

It goes without saying that the exemplary embodiments described here and shown in the drawing, such as already mentioned before, only considered as embodiments and that modifications in the construction and assembly of the device, yes even extensive constructive changes are possible. So the core of the device, i. H. the Plasma torch, with its guide in no way necessarily attached to a vehicle, but can also be stationary with its guide rail Hall scaffolding are provided, as well as, for example, on a slide guide, which in horizontal, inclined or vertical track can be moved into the operating position at the converter mouth is.

BATH ORIGINAL 909843/0703

Claims (11)

Claims 1. A method for burning off slag or melt residues in the mouth areas of metallurgical vessels, especially converters * pouring ladles or the like., Characterized in that a high temperature plasma focal jet is guided in oscillating or circular motion in a fixed path around the mouth of the vessel . 2. The method according to claim 1, characterized in that the plasma focal beam with its Stt «hlachse is guided essentially parallel to the mouth cone. 3 »Method according to claim 1, characterized in that the plasma focal beam with its beam axis is guided essentially parallel to the edge of the mouth. 4. The method according to claim 1, characterized in that the plasma focal beam along the inside of the mouth the refractory lining. 5. Device for carrying out the method according to claims 1 to k, characterized by a carrier (15) for a plasma burner (14) which can be moved in a closed path and whose ideal or physical axis of rotation approximately coincides with the converter terminal axis (la). 909843/0703 February 16, 1966 Pl / Me - 508l - 6. Apparatus according to claim 5, characterized in that the carrier (Γ5) for the plasma torch (l4) "on a movable on a horizontal track (3) Vehicle (4) is arranged. 7. Apparatus according to claim 5> characterized in that the carrier (13) for the plasma torch (l4) by means of a rotary engine (15 * l6;., 27, 29j 44) is movable. 8. Device according to claims 5 to 7, characterized in that the carrier (lj5) for the plasma torch (l4) by means of adjusting drives arranged on the vehicle (4) can be pivoted in the vertical plane (6 to 8) and by means of a further drivable adjusting device ( 10) can be moved back and forth in the direction of the vessel mouth axis (la). 9. Device according to öen claims 5 to 7 * thereby characterized in that the carrier (15) for the plasma 'burner (l4) is arranged on an extendable arm (j51) connected to the vehicle (4) which a lifting and / or pivoting movement can be transmitted. 10. Device according to claims 5 to 7 , characterized in that the carrier (Γ3) adjustable in such a way (6 to 8; 15, 16) is arranged that a cone surface can be described by means of the plasma focal beam, the vessel transversely to the mouth axis (la) can be brushed and / or radial individual cuts can be carried out. 11. Device according to claims 5 to 8, characterized characterized in that two opposite, on the periphery of the closed path or more evenly Carriers for plasma torches (14) distributed over the circumference are provided. 909843/0703 Blank page ORIGINAL INSPECTED