DE1807322A1 - Lining for metallurgical vessels, especially for electric arc furnaces - Google Patents

Description

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Fried. Krupp Hüttenwerke AG. 1807322

4630 Bochum 17.0ct. 1968

Lining for metallurgical vessels, in particular for electric arc furnaces.

The invention relates to a lining for metallurgical Vessels, in particular for electric arc furnaces, consisting of a refractory lining arranged within the vessel wall, which in the case of a new lining or if a wear lining is provided, it has to be partially renewed.

The breaking out of worn out residual masonry or fireproof Linings of metallurgical vessels, such as electric arc furnaces, can only be made after a furnace size measured cooling time. This means that a lot of time is used before a new lining to allow for faster cooling to effect the remaining masonry. The time during which the metallurgical vessel cannot be used is extraordinarily long, The breaking out of the walls, which are still warm, is extremely difficult and demanding for the workers involved, so

there is a need for improvement in this area.

It is the object of the invention to enable the breaking out of worn brickwork more efficiently and in a more time-saving manner and that to eliminate specified disadvantages.

According to the invention are to break out the worn residual masonry behind the masonry to be renewed, individual, vertically arranged, essentially rectangular ones on the side of the vessel wall Steel inserts installed distributed over the circumference of the vessel, which extend to the foot of the masonry. The dimensions of the Steel inserts are to be adapted to the size of the metallurgical vessels. For smaller ovens with a correspondingly stronger curvature either the width of the inlays can be reduced or the inlays must be adapted to the curvature of the metallurgical vessel will. The inlays are arranged behind the masonry in such a way that when the inlays are pulled, the entire vertical-

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standing masonry is brought to collapse. For example the inserts can be arranged at regular intervals parallel to the wall of the vessel.

In an expedient embodiment of the invention, the deposits have on Foot each has an angle pointing into the interior of the vessel, on which the masonry to be renewed rests at least partially. It can do this, for example be an angle welded to the lower end of each insert, which is located under the wear lining or the refractory lining, which is to be removed before a new delivery takes effect. Just a few centimeters is sufficient.

In order to make it easier to break out and to attach it more quickly and pull it safely, advantageously by means of a crane allow, each insert expediently has at least one stop in the region of its upper end.

The inlays can be scrap blanks, the foot of which is each provided with an angle iron and which in the area of their upper end each have two bores arranged one below the other as a stop. The dimensions of the scrap blanks are to be measured depending on the vessel and thus the lining height. The thickness of the inlays must of course be such that they can withstand pulling on the anchorage devices and, if possible, absorb the forces that occur when the brickwork is broken without deformation. For example, already 25 to 30 ram thickness, approx. 200 to ¹ J-OO mm wide and depending on the vessel and thus masonry height dimensioned scrap metal sheets can serve as inserts.

If the lining consists of wear lining and permanent lining or wear lining and backing, i.e. of several lining layers, so the inserts can be arranged in vertical masonry joints. In the presence of a back wall as permanent lining must the Ausreißvorrichtfang are placed between permanent and wear lining.

With the invention, a rational, time-saving and cost-effective Breaking out of worn out linings of metallurgical vessels achieved.

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An exemplary embodiment of the invention is shown in the drawing:

Fig. 1 shows schematically in a plan view the structure

the lining according to the invention using the example of an electric arc furnace,

Fig. 2 shows the structure in a side view,

Fig. 5 shows a scrap board as used as an insert is in front view and

FIG. 4 shows the scrap board according to FIG. 3 in a side view.

The electric arc furnace shown in FIG. 1 is built from the outside inwards from a vessel wall 5 , an adjoining space in which steel inserts 3 according to the invention are arranged, and the inner lining 1, which represents the remaining masonry to be broken out. The outer edge of the furnace is provided with a sand cup 8 in a known manner. The lining extends to the edge of the hearth slope J, which is provided with a compensation surface 6. The rectangular steel inserts 3 or scrap plates, as shown exactly in FIGS. 3 and 4, are arranged between the worn residual masonry 1 and the vessel wall 5. They stand vertically with their narrow edges above and below parallel to the outer vessel wall 5 and extend from the upper edge of the furnace to the foot of the worn residual masonry 1. An angle 4 is welded to the foot of each steel insert, the free end of which points into the interior of the vessel. The masonry 1 rests on this angle with a support of only a few centimeters. In the area of their upper end, the inlays are provided with bores 2 which are arranged vertically below one another and represent stops which, for example, a crane can attack.

The steel inserts 3 are in the lining when relining with built-in. If it is now necessary to remove the worn lining 1, after a short cooling time the upper worn masonry stones are removed

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and thereby the stop points 2 are exposed. The work can in some cases already be carried out during the cooling phase, since this can be done from the outer edge of the furnace or from the sand cup 8 can be carried out.

Because θ-η places with leading wear with melting of the upper parts of the scrap boards 3 are to be expected, are two Holes made at different heights are provided in order to have a stop in each case for connection to a crane. When pulling out by means of a crane separates or loosens at the level of the compensation surface 6 on which the new lining is built should be, the old worn brickwork 1 from the stove slope remaining in the oven 7

Around the liner falling over due to the pulling on the inserts j5 1, it is expedient to use a round plate that is dimensioned according to the size of the furnace and the weight of the excavated material introduced into the oven and placed on the stove in such a way that the plate with the stove slope 7 cuts off as closely as possible. the The broken-out refractory lining 1 then falls onto the aforementioned plate and, after the demolition work is complete, by means of a crane can be lifted out of the furnace.

The breakout is advantageously started at the point in the furnace where the premature wear is only very thin left behind. Furthermore, at such a point, a narrow joint can be chiseled into the lining, to take the tension off the remaining masonry. The deposits 3 are distributed over the entire circumference of the furnace that the entire masonry can be removed just by pulling the crane.

In addition to the advantages already mentioned in the introduction to friction In addition to the shorter breakout time, the quick creation of the smooth, unspoiled material required for the new lining is also possible Compensation area 6 reached. With the previously known This requires time-consuming sharpening work. In addition, it is advantageous that the inserts 3 are used several times can be. Worn, bent or annealed blanks can always be melted down scrap in the furnace «

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Claims (6)

P at claims ϊ 1. Lining for metallurgical vessels, / especially for electric arc furnaces, / consisting of a refractory lining arranged within the vessel wall, which in the case of a new lining / completely, or if a wear lining is provided, partially / to be renewed, characterized in that to break out of the worn Eest masonry behind the masonry to be renewed (1) on the side of the vessel wall, individual, vertically arranged, Substantially rectangular steel inserts (3) are installed distributed over the circumference of the vessel, which extend up extend to the foot of the masonry (1). 2. Lining according to claim 1, characterized in that the Inserts (3) each have an angle (4) pointing into the interior of the vessel on which the masonry (1) to be renewed at least partially rests. 3.Lining according to claim 1 and 2, characterized in that each insert (3) has at least one stop (2) in the area of its upper end to facilitate breaking out 4.lining; * according to any one of claims 1-3 that ä \ e deposits (3) scrap boards are, iit each provided with a W ^ nkeleisen (4) whose foot and with each other arranged in the region of its upper end in each case two bores (2) have as a stop. 5. Lining according to one of claims 1-4, characterized in that «d & ä attach the inserts in vertical masonry joints. T 3 are ordered. ■ "i 6.Lining according to claim 5> characterized in that the inserts between wear lining and permanent lining or * backing are arranged * 209809/0657 ORIGINAL INePECTBD