JPS633235B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a furnace body for an arc furnace equipped with a spout and a slag door, in which an upper part of the furnace body and a lower part of the furnace body are divided by a separating joint surface.

For several years now, segmented furnace bodies have been widely used in electric arc furnaces. The furnace body is horizontally divided no more than about 200 mm to 300 mm above the melt. In order to minimize the lining surface left in the lower part of the furnace body, the separation point is installed fairly low. If the ceramic lining needs to be renewed, the upper part of the furnace body is removed, and the lining of the lower part of the furnace body, called the hearth, is simply removed and replaced with a new refractory material. . After repair, the hearth is covered with a previously prepared second furnace body upper part. The advantage of this arrangement is that the refurbishment of a segmented furnace body can be carried out in a shorter time than in the case of an undivided furnace body.

However, a disadvantage of the known design is that, in the event of tilting, liquid melt spills out of the separating joint between the furnace body parts in the region of the spout. If the separating joint surfaces are not designed with sufficient precision and are subsequently sealed during operation with a refractory material, there is a risk of melt spillage.

The object of the invention is to provide a furnace body of the type mentioned at the outset, which avoids the disadvantages of the known designs and in which the risk of melt spillage is prevented in an economical manner.

According to the present invention, the above-mentioned problem is solved in such a way that the separating joint surface is located above the melt during pouring and slag discharge with respect to the horizontal plane in the furnace body resting position in the inlet range and slag door range. and the separation joint surface extends obliquely upward with respect to the horizontal plane in the spout region and the slag door region, in which case both inclined separation joint surface sections extend during pouring or This problem was solved by providing a water cooling system that extends approximately parallel to the melt level that occurs during slag discharge and that extends until the upper part of the furnace body reaches the separating joint surface.

In the present invention, since the separating joint surface is projected upward in the area of the spout and in the area of the slag door, even when the furnace body is tilted during pouring and discharging slag, the separating joint surface can be removed. There is no overflow of melt and therefore no need to seal the separating joint surfaces sufficiently well. In this case, as much of the wear surface as possible is left in the easily repairable upper part of the furnace body. Furthermore, by providing the upper part of the furnace body with a water cooling device up to the separation joint surface, the upper part of the furnace body can be used without providing a lining. In other words, the lining only needs to be provided in the lower part of the furnace body. This is because the upper part of the furnace body no longer comes into contact with the melt. In this case, the upper part of the furnace body does not have to be replaced at the time intervals previously required, which significantly reduces operating costs.

Furthermore, due to the structure of the separating joint surface of the present invention, the upper part of the furnace body and the lower part of the furnace body are, so to speak, engaged with each other.
Moreover, it is not necessary to use a special fixing member in the main load direction to connect the upper part of the furnace body and the lower part of the furnace body.

An advantageous embodiment according to claim 2 simplifies the construction of the furnace body, in which case the cooling box forms the support structure of the upper part of the furnace body.
The embodiment according to claim 3 provides an advantageous and simple construction of the cooling box.
The embodiment according to claim 4 ensures that the cooling water is guided in a satisfactory manner. An advantageous embodiment according to claim 5 provides relatively uniform cooling of the upper part of the furnace body.

The invention will now be explained with reference to the illustrated embodiment.

In the embodiment according to the invention according to FIG. 1, an upper part 1 and a lower part 2 of the furnace body are shown, which are divided by a separating joint surface 3, with a section projecting above the separating joint surface 3. is designated by the symbol 3'.
Linings 4 and 5 are provided in the lower part 2 and the upper part 1 of the furnace body, and the spout 6 is connected to the first
The slag door 8 is provided on the left side in the figure and on the right side in FIG. Furnace lower part 1 and furnace upper part 2
A fixing member 7 is provided to connect the two. Furthermore, the melt is indicated at 9, and the dotted lines indicate the melt level in the various working positions of the furnace body. In this case, the highest melt level during melting is designated by 10, the highest melt level during slag discharge is designated by 11, and the highest melt level during pouring is designated by 12.

In FIGS. 2, 3, and 4, components that are the same as in FIG. 1 have the same reference numerals as in FIG. The embodiment shown in FIG. 2 essentially corresponds to the embodiment shown in FIG.

In the partial vertical section shown in FIG. 3, the separation interface 3 with the cooling box 13 is shown in detail. The cooling box 13 is the inner wall 14 of the furnace.
are delimited by the upper edge lamina 15 and the cylindrical outer wall 16. An iron piece 17 is fixed, for example welded, to the inner wall of the furnace, and is further attached to the inner wall of the furnace 14.
There is a thin ceramic layer 18 that protects the inner wall of the furnace.
is provided by injection method. A water guide plate 19 is arranged inside the cooling box 13, and the cooling box 13 has a supply section 21 and a discharge section 22. Furthermore, the cooling box 13 has a fixed member 7
is supported on one of the flange-shaped support plates 20, which are connected, for example, via pins and wedges. FIG. 3 shows a part of the furnace wall 22, on which the lining 4 is formed.

FIG. 4 shows the lining 5 according to FIG. 1 in a developed view on a reduced scale. The lower limit of the developed view shows the course of the separation joint surface. Furthermore, both the spout cutout and the slug door cutout are clearly visible in FIG.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a vertical sectional view of a furnace body in which a lining is provided in the upper part of the furnace body, and Fig. 2 is a vertical sectional view of the furnace body in which the upper part of the furnace body is provided with a lining. FIG. 3 is a partial vertical sectional view of the separating joint surface and the cooling box; FIG. 4 is a diagram according to FIG. 1 shown in reduced dimensions; It is a developed view of the upper part of the furnace body. 1... upper part of the furnace body, 2... lower part of the furnace body, 3
...Separation joint surface, 3'...Protruding section, 4,5...
Lining, 6... Outlet, 7... Fixing member, 8
...slag door, 9...melt, 10,11,1
2... Melt level, 13... Cooling box, 1
4... Furnace inner wall, 15... Edge thin plate, 16... Outer wall, 17... Iron piece, 18... Ceramic layer, 19
... Water guide thin plate, 20 ... Support thin plate, 21 ... Supply section, 22 ... Discharge section, 23 ... Furnace body wall.

Claims (1)

[Scope of Claims] 1. In a furnace body of an arc furnace equipped with an inlet and a slag door, in which an upper part of the furnace body and a lower part of the furnace body are divided by a separating joint surface, the separating joint surface 3 extends upwards in the inlet region and in the slag door region with respect to the horizontal plane in the rest position of the furnace body, such that the separating joint surface is located above the melt during pouring and slag discharge; The joint surface extends obliquely upwards with respect to the horizontal plane in the area of the spout and the slag door, and the two inclined separating joint surface sections extend approximately parallel to the melt level that occurs during pouring or slag discharge. , A furnace body for an arc furnace, characterized in that a water cooling device is provided until the upper part 2 of the furnace body reaches the separation joint surface. 2. The furnace body of an arc furnace according to claim 1, wherein the water cooling device is constituted by at least one cooling box 13 configured as a support structure. 3. The cooling box 13 is configured as an annular tank formed by a cylindrical furnace inner wall 14 and a cylindrical outer wall 16, and has at least one supply 21 and at least one outlet for cooling water. 22. A furnace body for an arc furnace according to claim 2, comprising: 22. 4. A furnace body for an arc furnace according to claim 2, wherein a thin water guide plate 19 is provided inside the cooling box 13. 5. The furnace body of an arc furnace according to claim 4, wherein the thin water guide plate 19 is formed in a linear shape.