JPS6329192B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to metal melting furnaces, particularly arc furnaces and furnace vessels thereof.

[Prior Art] A tiltable furnace vessel of this type is described in German Patent Publication No. 32 41 987-A1 and European Patent Publication No. 01 28 965-A1. In the above, the furnace vessel has a bay-like protrusion, and the tap is provided on the bottom surface thereof. The bay-shaped protruding part is
The spout can be easily accessed from inside the furnace through a maintenance opening that can be closed by a cover, but this is difficult due to its construction. In the hot water extraction process,
In order to prevent the influence of the pouring flow on the slag floating on the molten metal bath during the pouring operation and to enable pouring almost without slag, European Patent Publication No. 01 28 965 - In the furnace vessel according to No. A1, the bay-like projecting part has an inner boundary wall that is approximately trapezoidal or rectangular in plan view, and the side wall of the bay-like projecting part has a furnace vessel that is circular or elliptical in plan view. are arranged in a predetermined relationship inside the .

In an electric metal smelting furnace with a fixed furnace vessel, as described in German Patent Publication No. 29 21 702-C2, at least one spout is arranged at the bottom of the furnace vessel. The furnace vessel likewise has a shape other than circular in plan view, for example an ellipse. The upper container also has the same shape as the lower container in plan view. In such containers, it is difficult to operate the spout, so replacing the bricks for the spout passage and filling the bricks at the spout using filler after pouring is relatively expensive. becomes.

[Problems to be Solved by the Invention] In the above-mentioned tiltable furnace vessel, the hot water outlet is provided at the bottom of the bay-shaped protruding portion formed in the furnace vessel, so that when the furnace vessel is tilted during the pouring operation, the hot water does not flow out. At the beginning of the discharging process, the molten metal filling the furnace vessel flows toward a bay-shaped protrusion that is narrower than the furnace vessel and has an approximately trapezoidal or rectangular planar shape. The molten metal is scattered from the surface layer of the molten metal near the top of the spout of the furnace, and the lid that covers the bay-shaped protruding portion and the highest bath level of the molten metal surface layer (where the amount of molten metal in the furnace vessel is the largest) Since it was not possible to maintain a large distance between the lid and the lid surface, there was a risk that the water cooling device of the lid would be destroyed by scattering of the molten metal.

The present invention consists of a lower vessel for containing a molten metal bath with a refractory lining and a spout located at an offset position on the bottom surface, and a plurality of liquid-cooled wall elements. A metal melting furnace, in particular an electric arc furnace, having an upper vessel with a lower edge that fits into the upper edge of the vessel and a maintenance opening above the tap, which can be closed by a cover. It is an object of the present invention to provide a furnace vessel in which the operation of a spout during maintenance work is facilitated without providing a bay-shaped protruding portion on the furnace vessel. The invention further makes it possible to achieve the above object in an existing furnace by a simple replacement operation, without changing the configuration of the electrode support mechanism and, if possible, the cover and the cover support mechanism. This is another purpose.

[Means to Solve the Problems] The present invention provides a furnace vessel including the above-mentioned lower container, upper container, and maintenance opening, in which the tap hole is connected to the lower container having a circular or elliptical shape in a plan view. inside the vessel, along the longest axis of the lower vessel, such as the long axis of an elliptical shape, and in the vicinity of a wall element of the furnace vessel, the upper vessel being arranged at an upper position of the spout; A furnace vessel characterized in that it comprises a vessel portion that is displaced relative to the lower vessel toward the center of the furnace vessel, and a maintenance opening formed in the vessel portion is positioned above the tap opening. It is.

Further, in the above-mentioned furnace vessel, the present invention provides a container portion of the upper vessel provided at an upper position of the spout, which is a wall element portion of the upper vessel that can be displaced inwardly of the furnace vessel, and the above-mentioned maintenance The furnace vessel is characterized in that the opening is formed above the spout by displacing this wall element portion.

Furthermore, the present invention provides that the lower vessel of the furnace vessel has an elliptical shape in plan, and that the center point of the circle is aligned with the first center point of the first vessel portion of the upper vessel (this is the second center point). a second container part in the form of a sector-shaped portion of a circular ring having a third center point at the center of the circle; The fourth container part is formed by joining the arcuate parts of the second and third container parts with a straight line or a curved line so that the planar shape of the entire lower container is an ellipse, and the upper container has the first center point a first container part in the form of a central circular ring; and a part joined at its lower edge to the oval shape of the upper edge of the lower container and providing said maintenance opening at a position above said spout. The furnace vessel is characterized in that it is comprised of a portion that is joined to the first container, and a fifth container portion that is provided with a portion that is joined to the first container.

Further, the present invention provides an arc furnace equipped with the above furnace vessel, in which three electrodes are arranged in a triangular row inside the planar shape of the furnace vessel, and the distance between the centers of the electrodes is The arc furnace is characterized in that the distance between the second center point and the third center point in the lower container of the container is substantially equal.

[Configuration and Effects of the Invention] In the present invention, the spout is not provided in a bay-shaped part that is formed to protrude into the furnace container, but is provided on the bottom surface of the lower container that is formed in an oval or circular shape in a plan view. . If the lower container is an oval shape obtained by converting the round lower container easily and without problems with respect to stability, then the volume of the container is: , larger than a container having an outwardly projecting bay-shaped portion. The part of the upper vessel in which the maintenance opening is provided and which is displaced or displaceable towards the center of the vessel with respect to the lower vessel has a tap hole which is not in the area of the bay-like projection but is circular in plan view. Alternatively, the spout can be easily operated even though it is provided inside the lower container having an elliptical shape. Also, the displaced or displaceable portion of the upper vessel located above the tap can be located at a considerable height above the surface when the amount of molten metal in the furnace vessel is at its maximum. In the early stages of pouring work, in which a furnace vessel containing a large amount of molten metal is tilted, even if molten metal is scattered on the surface layer of the molten metal above the spout, there is a risk of damaging the upper vessel. That's not it. In a first aspect of the invention, the container part which is displaced towards the center of the container may be in the form of a recess in the upper container, which projects into the interior of the container and has a maintenance section on its bottom surface. An opening is provided. Preferably, the recess has one or more roof-like sloped sections to prevent the charge material from remaining in the upper part of the recess when it is loaded into the furnace. The recess may be in the form of an inwardly extending bay configuration in at least one of the water-cooled wall elements of the furnace vessel.

In a second embodiment of the invention, the upper container is movable into the interior of the container and in the inwardly moved or displaced state forms a recess similar to that of the first embodiment; It may have a wall element section which forms the normal wall shape of the upper container when viewed from the inside and moved outwards. Therefore, in the second aspect, the structure according to the first aspect is provided only temporarily, i.e. only when operation of the spout is required for maintenance work, and other aspects of the furnace During the operation period, the recess extending into the interior of the furnace is removed, and with respect to the loads on the wall elements forming the recess, the conditions apply for an upper vessel without an inwardly extending bay-like structure forming the recess. is the same as

In the case of providing a wall element part which is movable into the interior of the vessel, the recessed form provides a lower part and a side wall part which forms a shielding means with respect to the interior of the furnace vessel when the wall element part is moved into the interior of the vessel. is formed by a wall element portion having a

In this configuration, the maintenance opening should be provided on the lower side. The lower part and/or the side wall part may consist of cooling pipes, for example, and may be water-cooled. Preferably, the wall element part takes the form of a pivot member, the pivot axis of which is arranged horizontally or vertically. A hydraulic cylinder may be used as the drive device for the pivot member, one end of the cylinder being fixed to the pivot member and the other end being fixed to the upper container, preferably a water-cooled ring surrounding the upper outer edge of the upper container. Ru.

In order to prevent the movable wall element part from seizing on the refractory lining of the lower vessel, according to a preferred embodiment, in the area of the movable wall element part, the upper end face of the refractory lining of the lower vessel is provided with a cooling element; For example, a cooling pipe is provided.

In the tapping area, the inner upper edge of the refractory lining of the lower vessel is preferably aligned substantially perpendicularly with the inner surface of the wall element of the upper vessel at that location. This arrangement allows the slag or charge material to adhere to the upper surface of the refractory lining of the lower vessel;
It no longer becomes a hindrance to the movable wall element. This feature can be achieved by a segmented part of the upper container which is straight in plan view, or by the lower container having a bulging shape which locally extends slightly outwards in the tap area.

In a second embodiment, the furnace vessel, in plan view, has a rectangular section and two
An elliptical shape formed by two semicircular disk sections is also preferred.

In a third aspect of the invention, which is particularly suitable for converting existing arc furnaces having round-shaped vessels, the lower vessel is oval in plan and the upper vessel is circular in plan at the top. ,
The portion of the upper vessel that is displaced relative to the lower vessel above the tap is caused by the relative offset of the center lines of the lower vessel and the circular upper vessel. In a third aspect of the invention,
The outline of the planar shape of the lower container includes a second container portion having a portion of a circle centered on the second center point, and a third portion having a portion of a circle centered on the second center point.
a third container part having a part of a circle centered on the center point of the container, and a fourth container part having a part joining these two circular parts with a straight line or a curve slightly bulging outward; The first container part has an elliptical shape as a whole, and the outline of the planar shape of the upper container is a part of a circle centered on the first center point that coincides with the second center point. and a fifth container part whose lower edge joins the upper edge of the lower container in an elliptical shape and which joins to the first container at the upper edge. completely attached to the periphery of the part. A maintenance opening is then provided in the fifth container section at a location above the tap.

When the furnace vessel of an arc furnace having such a configuration is converted according to the present invention, the volume of the molten metal bath can be increased. In particular, it is possible to change the cover structure and the structure of the electrode and cover support mechanism without requiring an increase in the height of the bath, which would lead to an extension of the refining time during decarburization of the molten iron bath. The volume of the molten metal bath can be increased without need. When converting a round-shaped furnace vessel, cut the upper and lower vessels in the middle, fit one vessel section in place on the lower vessel to form an elliptical configuration, and insert the upper vessel into the upper vessel. In the region above the tap, it is only necessary to provide one container part, which is displaced towards the center of the container and can be stepped or inclined.

In a fourth aspect of the present invention, three electrodes are arranged in a triangular row in the planar shape of the furnace vessel of the third aspect to constitute an arc furnace. The distance between the centers of these electrodes is made substantially equal to the distance between the second and third center points of the lower container. According to the fourth aspect of the present invention, although the planar shape of the lower container of the arc furnace is made into an elliptical shape, the arrangement of the three electrodes is the same as in a round furnace; In comparison with the case where the radius of the circle of the vessel is the same as the radius of the round furnace, the volume of the bath can be increased by about one-third, the required refining time is not increased, and the round furnace is used in the work procedure. It is not much different from a molded furnace.

[Example] The present invention will be described below with reference to the accompanying drawings.

First, FIG. 1 will be explained. In Figure 1,
A tiltable furnace vessel 1 of an arc furnace with three electrodes 2a, 2b, 2c is schematically shown in a plan view. The furnace vessel 1 comprises an upper vessel 3 consisting of water-cooled wall elements and a lower vessel 4 made of or lined with refractory material. The arc furnace cover, electrode support arm and other parts of the arc furnace are not shown.

As shown in FIG. 1, the furnace vessel 1 is approximately elliptical in plan view. Strictly speaking, the shape of the furnace vessel 1 in a plan view is a combination of a rectangular center portion and two semicircular disk-shaped portions, and the shape between the semicircular disk-shaped portions is a combination of a rectangular central portion and two semicircular disk-shaped portions. The length of the rectangular portion is shown in FIG. 1 as the length of double arrow A. The length A is approximately equal to the distance between the center lines of the electrodes. The electrodes are centrally located relative to the center of the container as shown in FIG.

FIG. 3 is a schematic cross-sectional view of the furnace vessel. A hot water outlet 11 is provided on the bottom surface 12 of the lower container 4 near the edge of the container. A closing means for closing the tap is not shown. The furnace vessel is supported so as to be tiltable.

The upper container 3 has a recess 6 above the spout 11 that extends to the inside of the container. The recess 6 is located in one or more water-cooled wall elements of the upper container 3.
Formed into an inwardly extending bay structure. The upper side of the recess 6 is formed into a roof shape by two inclined parts 10. The lower part of the recess 6 facing the molten metal 5 (see FIG. 2) is formed by a water-cooled floor 8, and the water-cooled floor 8 has a water-cooled floor 8 arranged vertically to the spout 11. A maintenance opening 9 is formed. The maintenance opening 9 can be closed by a cover 7. The lower part of the recess 6 is arranged approximately 600 to 1200 mm above the maximum permissible height of the surface of the molten metal bath.

As indicated by the arrow 16 in FIG. 3, the tap 11 can be operated from outside the upper vessel 3. Since the lower side of the recess 6 is a relatively short distance from the spout 11, the spout 11 can be easily operated.

Reference numeral 13 indicates a rail 15 fixed to the upper container.
1 shows an electric lifting device which is displaceable in the direction indicated by arrow 14 by means of rollers along . Cover 7 or water-cooled floor 8 by electric lifting device 13
can be lifted and removed, and a new anti-wear pipe can be attached to the spout 11.

FIG. 4 is a plan view showing the furnace vessel 101 of the arc furnace. Similar to FIGS. 1 to 3, FIGS. 4 and 5 to 8 also show, for example, a furnace cover,
Parts of the arc furnace that are not important with respect to the invention are not shown, such as the electrodes, including the electrode support arms, and the closing means for closing the tap in the bottom of the furnace.

The furnace vessel 101 has a substantially oval shape in cross section.
More precisely, the shape of the furnace vessel 101 in a plan view is a shape in which two semicircular disk-shaped parts are integrally joined via a rectangular part.

Furnace vessel 101 has a lower vessel 102 lined with a refractory lining 104 . As shown in FIG. 4, the upper end surface of the refractory lining 104 is open. Adjacent to the lower container and towards the top of the area is an upper container 103. The inside of the upper container 103 is lined with straight water-cooled wall elements 106 and curved water-cooled wall elements 106 . A water-cooled ring 105 is provided around the upper container 103 at its upper outer edge. The connection configuration of the water cooling circuit is not shown.

As shown in the upper part of FIG.
In the narrow side area of 1, a tap area 107 indicated by a broken line is provided, and a tap spout 108 is provided on the bottom of the container in this area (FIG. 5).

The shape of the upper container 103 in plan view substantially corresponds to the planar shape of the lower container 102, but in the tap area 107, the upper container 103 is not round but has a straight shape. To this end, the water cooling ring 105 surrounding the upper container 103 has a long straight section 111. In this region, the water-cooled wall elements of the upper container 103 take the form of flat plates. The water-cooled wall element 109 is arranged so as to be pivotable toward the center of the furnace, as will be explained in more detail below. This wall element 109
supports a plurality of sidewalls 112 on its outwardly facing edges. FIG. 5 shows one side wall portion.

FIG. 5 shows in detail the water-cooled wall element 109, which is rotatable toward the center of the furnace, and the parts of the furnace vessel associated with that wall element. Water-cooled wall element 10
9 to the position shown by the broken line in FIG.
8 can be operated. For this purpose,
The furnace is equipped with a maintenance opening, which will be described in more detail below.

A water-cooled side wall 112 that connects adjacent to the two side edges of the water-cooled wall element 109 has a generally trapezoidal cross section and connects adjacent to the lower edge of the water-cooled wall element 109. The lower part 116 has an arcuate cross-sectional shape and is composed of a plurality of cooling pipes. A substantially square or circular maintenance opening 117 is formed in the lower part 116, and when the water-cooled wall element 109 is rotated towards the center of the vessel, the center of the maintenance opening 117 is located at the spout. Vertical line 1 passing through 108
It almost matches 21.

The water-cooled wall element 109 and its externally adjacent side wall part 112 as well as its lower part 116 provide a shielding means for the interior of the furnace vessel when work is carried out at the tap 108. form. Such operations include, for example, cleaning the spout when there is no molten metal 113 in the lower vessel or when only metal waste remains in the lower vessel.

In the embodiment shown in FIG. 5, each rotatable element 109, 112, 116
It is attached to a horizontal rotation shaft 120 attached to the upper outer edge of. Straight section 111 of the water-cooled ring surrounding the upper container 103 at its upper edge
supports on its outside two mounting arms 114. A stroke cylinder 115 pivotally connected to the outer end of each of the mounting arms has a piston rod pivotally connected to the outside of the water-cooled wall element 109. When the cylinder 115 is actuated, each rotatable element is moved along the horizontal pivot axis 120.
With respect to one position shown by the solid line in Figure 5,
It rotates between the other position shown by the broken line in FIG.

In order to prevent the lower side 116 of the water-cooled wall element 109 from seizing onto the upper part of the refractory lining 104, copper cooling pipes are installed on the upper surface 118 of the refractory lining 104 in the area facing the water-cooled wall element 109. 119 is provided.

As shown in FIG. 5, lower vessel 102 has vertical side walls in tap area 107. As shown in FIG. In that region, the inner surface of the water-cooled wall element 109 is located at the upper inner edge 110 of the vertically arranged refractory lining 104.
They are lined up with

FIG. 6 shows another embodiment of the invention. Components that are the same or similar to those shown in FIG. 4 are designated by the same reference numerals plus 100. Components that have already been explained will not be explained again here. The main difference between the embodiment shown in FIG. 4 and the embodiment shown in FIG. 6 is that in the case of FIG.
In the case where the lower container has an outwardly extending bulge 225, the inside of the water-cooled wall element 209 at that point is lined with a refractory lining, similar to the embodiment shown in FIG. Upper inner edge 21 of 204
It is a point that protrudes outward to the extent that it can be aligned with 0. This configuration allows, on the one hand, to precede the outwardly extending portion of the lower container with the upper covering means and, on the other hand, to provide a step at the transition from the upper container to the lower container, which leads to the adhesion of slag. will be removed.

FIG. 7 is a view corresponding to the part shown in FIG. 5 of a furnace vessel of the type shown in FIG. 6; Lower container 20
The side walls of 2 are sloped in the form of outwardly extending bulges 225. Its upper inner edge 210 is aligned with the inner surface of the rotatable water-cooled wall element 209.

The embodiment shown in FIG. 7 does not have the cooling pipes shown in FIG. 5 on the end face of the lining of the lower container.

In the embodiments shown in FIGS. 4 to 7,
The water-cooled wall elements 109, 209, together with the parts connected outwardly adjacent thereto, are arranged on horizontal pivot axes 120, 2 at the upper outer edge of the reactor vessel.
It is rotatable about 20. FIG. 8 shows an embodiment using a vertical pivot axis 120'.

Referring to FIG. 8, the pivoting member provided for operating the spout has a vertical pivot shaft 12.
It is rotatable in the horizontal direction with respect to 0', and at the same time,
Water-cooled wall element 10 forming the side wall of the rotating member
9′, and a side wall portion 11 having an arcuate cross section.
2', a flat lower part 116' in which a maintenance opening 117' is formed, and an upper part, not shown, which corresponds in shape to the lower part. A hydraulic cylinder 115' fixed to the water-cooled ring 105 surrounding the outer circumference of the upper container comprises a piston rod 123 connected to the outer end of a plate 122 welded to the outside of the water-cooled wall element 109'. Plate 122 supports a vertical pivot axis 120' with another plate (not shown) disposed in parallel relation thereto and spaced therefrom.

In the embodiments described with reference to FIGS. 4 to 8, the spout in the bottom of the container is operated by means of a pivot member that is rotatable about a horizontal or vertical pivot axis. can be made possible.
The lower part and the side wall part, which are connected to the rotatable water-cooled wall elements 109, 109', are cooled and themselves have a cooling effect and form a shielding means with respect to the interior of the container. Under normal melting and refining operating conditions, the pivotable members are pivoted back outwardly and the pivotable water-cooled wall elements 109, 109' are replaced by the other water-cooled wall elements of the upper vessel. It is fitted in the rows 106 and 206.

Furnace vessel 3 of the arc furnace shown in FIGS. 9 and 10
01 includes a lower container 303 having a refractory lining 304 and containing a molten metal bath 302, and a closure member 3 located at an offset position on the bottom of the container below.
06.
The closing member 306 can be rotated from the closed position shown in FIG. 9 to the open position in which the tap 305 is opened.

The upper container 309 formed by the liquid-cooled wall element 308 connects with the lower container 3 by its lower edge 310.
It is attached to the upper edge 307 of 03. Upper container 3
09 is the first in the plan view (see Figure 10).
It has a first upper container portion 311 in the form of a circular ring having a center point 312 as the center of the circle. The lower container 303 is located at the second center point 3 in plan view.
a second container portion 313 in the form of a sector-shaped portion of a circular ring centered at 14;
The center point 314 of coincides with the first center point 312 . In the illustrated construction, the angle at the center of the sector of the circular ring, designated 315, is 180 degrees. That is, the sector of the circular ring takes the form of a sector of a semicircular ring. Angle 315 should be between 120° and 180°.

The lower container 303 further includes a third container portion 316 which takes the form of a sector-shaped portion of a circular ring with a center angle of 180° similar to the second container portion 313 in plan view as shown in FIG. and the third container portion 316 is disposed in opposing relation to the second container portion 313. The third center point 317 associated with the third container portion 316 is
The position is shifted outward by a distance 318 with respect to the center point 314 of .

Finally, the lower container 303 has a second container portion 313 and a third container portion in plan view as shown in FIG.
and a fourth container portion 316 linearly connected to each other such that the upper edge 307 of the lower container 303 has an oval shape as is apparent from FIG.
It further includes a container portion 319 . Angle 315 is
If smaller than 180°, the fourth container part 319 should be taken into account in the plan view to ensure a smooth transition.
Preferably, the second container part and the third container part are joined in each case by a slightly outwardly bulging curve. This state is not shown.

The upper container 309 has a lower edge 310 than the lower container 3.
It further includes a fifth lower container portion 320 that conforms to the oval shape of the upper edge 307 of 03.

In the plan view (see Figure 10), the hot water outlet 3
05 is the longitudinal axis 3 of the elliptical lower container 303
21 and located near the wall of the container.
The furnace vessel is tiltable in the direction of the longitudinal axis of the oval lower vessel, for which purpose the assembly comprises a furnace cradle 322 and a hydraulic cylinder 323. A working opening 325, which can be closed by a door 324, is arranged on the side of the wall of the furnace vessel opposite the tap 305.

In the section shown on the right side of FIGS. 9 and 10, the fifth container section 320 is connected to the first container section 31.
1, but in the region shown on the left side of FIGS. 9 and 10, that is, the region transitioning from the first container part to the third and fourth container parts, the fifth The container part has a stepped structure. In the plan view shown in FIG. 10, the stepped fifth container section mentioned above is represented as a circular sickle-shaped area.

The fifth container part is provided with a maintenance opening 327 which is used to operate the internal tap 305 and which can be closed by a cover 326. The maintenance opening may also be used, for example, to fill the spout 305 with pourable refractory material after a tap operation. A pipe 329 is disposed along one edge of the maintenance opening 327 to protect a worker approaching the maintenance opening 327 by means of a work platform 328 from hot gases escaping from the maintenance opening 327. do. The pipe 329 has a plurality of outlet openings oriented inwardly at an angle of inclination with respect to the plane of the maintenance opening 327 . Pipe 329 generates a gas jet that is oriented sloping toward the interior of the furnace and acts as a curtain to prevent hot furnace gases from escaping.

The embodiment shown in FIG. 11 and FIG.
The container portion 320 shown in FIGS. 9 and 10 is not stepped but has an inclined shape in the transition region from the first container portion to the third and fourth container portions. This is different from the example. In such a configuration, the liquid-cooled elements of the upper vessel are placed at a suitable safety distance from the area of the molten metal bath that is above the tap and where squirting may occur in the bath. Along with this, there is an opening 327 for maintenance and a hot water outlet 3.
05 can be shortened, thereby making it easier to operate the spout. In this configuration, the pipe 329 for generating the gas curtain will make an even more important contribution. Furthermore, in this embodiment (see FIG. 11), the bottom of the container is shaped to drop toward the tap 305 so that the container does not need to be tilted during the taping operation.

As shown in FIGS. 10 and 12, the electrode support arm 330 extends laterally with respect to the longitudinal axis 321 of the oval lower container. As is further evident from these figures, the upper edge of the upper container takes the form of a circular ring. Therefore, the furnace according to the invention does not differ from a round furnace with regard to the cover and electrode support arms and the cover support mechanism (not shown), and when converting a round furnace according to the invention:
There is no need to change the cover, cover support mechanism and electrode support mechanism. Even so, in the furnace according to the invention, by converting the lower vessel from a round shape to an elliptical shape, the spacing 318 between the center points 314, 317 is approximately equal to the spacing between the electrode axes, as in the illustrated situation. In the equal case, the volume of the bath and at the same time its surface area can be increased by approximately one third. Since not only the volume of the bath but also its surface area is increased, the required refining time is not increased. That is, the increase in volume is not disadvantageous at all from the point of view of the working procedure.

When a round furnace vessel is converted according to the invention, the upper vessel and the lower vessel are cut in the center and the fourth vessel portion 319 is inserted into the second and third vessel portions 31 of the lower vessel.
3 and 316, a fifth container portion 320 of sloping or stepped shape is inserted from the first container portion 311 of the upper container to the third and fourth container portions 311 of the upper container.
It is sufficient to place it in the region transitioning to the container parts 316 and 319 of the container. Although the furnace vessel according to the invention does not have a bay-like projection, it is possible to operate the tap through the wall of the furnace vessel, and
The distance to the water-cooled elements in the danger area above the tap is increased compared to the bay-like projection.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of an arc furnace vessel having a concave portion above the spout, which is the first aspect of the present invention, and FIG. 3 is a schematic partial sectional view of the essential parts of the furnace vessel shown in FIG. 1 along a cutting plane corresponding to the vertical longitudinal center plane of the furnace vessel; FIG. Concerning the second aspect of the invention, FIG.
FIG. 6 is a partial cross-sectional view of the main parts of the furnace vessel shown in the figure.
FIG. 4 is a plan view of a furnace vessel which is a modification of the furnace vessel shown in FIG. 9 is a plan view of another embodiment of a furnace vessel having a wall element portion rotatable into the interior of the furnace vessel about a vertical rotation axis, relating to the second aspect of the present invention; FIG.
The figure is a longitudinal sectional view of an embodiment of the furnace vessel according to the third aspect of the present invention and the furnace vessel of an arc furnace according to the fourth aspect, and FIG. FIG. 11 is a longitudinal sectional view of another embodiment of the furnace vessel of the third aspect of the present invention and the furnace vessel of the arc furnace according to the fourth aspect,
FIG. 12 is a partially cutaway plan view showing the arrangement of electrodes. In the figure, the following symbols indicate the following parts, respectively. 1,101,201,301...Furnace vessel,
3,103,203,309...Upper container, 4,
102,202,303...lower container, 5,11
3,213,302...molten metal bath, 6,...recess, 7,326...cover, 9,117,11
7', 217, 327...Opening for maintenance, 11,
108, 208, 305... Hot water outlet, 104,
204,304...Fireproof lining, 107,2
07... Hot water tapping area, 311... First container part, 313... Second container part, 316... Third
Container portion, 319...Fourth container portion, 320
...The fifth container part.

Claims (1)

[Scope of Claims] 1. A lower vessel for accommodating a molten metal bath, comprising a refractory lining and a spout located at an offset position on the bottom surface, and a plurality of liquid-cooled wall elements. , an upper container having a lower edge supported above an upper edge of the lower container; and a maintenance opening located above the tap and capable of being closed by a cover. In the furnace vessel of a furnace, particularly an arc furnace, (a) the spout is located inside the lower vessel which is circular or elliptical in plan, and is located along the longitudinal direction of the lower vessel such as the long axis of the elliptical shape; (b) the upper vessel is displaced with respect to the lower vessel towards the center of the furnace vessel at an upper position of the tap; 1. A furnace vessel characterized in that the vessel has a vessel portion, and a maintenance opening formed in the vessel portion is located above the spout. 2. A recess is formed in the upper container and extends inside the furnace container and above the spout provided in the lower container, and a bottom floor below the recess is provided with a recess for maintenance. The furnace vessel according to claim 1, characterized in that an opening is formed. 3. The furnace vessel according to claim 2, wherein one or more roof-like sloped parts are formed on the upper side of the recessed part. 4. According to claim 2 or 3, the recess is formed in a liquid-cooled wall element of the upper vessel in a bay-like structure extending inwardly of the furnace vessel. furnace vessel. 5. The lower container has a planar shape in which two semicircular disc-shaped parts are connected on both sides of a rectangular part, and the hot water outlet is disposed at the edge of the container. A furnace vessel according to any one of claims 1 to 4. 6 consisting of a lower vessel for accommodating a molten metal bath, with a refractory lining and a spout located at an offset position on the bottom, and a plurality of liquid-cooled wall elements above the lower vessel; A metal melting furnace, in particular an electric arc furnace, having an upper vessel with a lower edge supported above the edge and a maintenance opening located above the spout and closable by a cover. In the furnace vessel, (a) the spout is located inside the lower vessel having a circular or elliptical shape in plan, along a longitudinal axis of the lower vessel such as the long axis of the elliptical shape, and (b) the upper vessel includes a wall element portion displaceable inwardly of the furnace vessel at a position above the spout; A furnace vessel characterized in that the opening is formed by displacement of the wall element portion. 7 said wall element part has a lower side and a side wall part forming a shielding means with respect to the interior of the furnace vessel when said part is displaced towards the inside of the furnace vessel; 7. The furnace vessel according to claim 6, wherein is formed on the lower side portion. 8. Claim 6, characterized in that the displaceable wall element portion is configured as a rotating member.
Furnace vessel according to paragraph or paragraph 7. 9. The furnace vessel according to claim 8, wherein a fluid cylinder is connected to the rotating member as a driving device, and the fluid cylinder is supported by an upper vessel. 10. The furnace vessel according to claim 8 or 9, wherein the rotating shaft of the rotating member is arranged horizontally. 11. Claims characterized in that the rotation axis of the rotation member is arranged vertically, and the wall element portion provided in the upper region of the spout constitutes a side wall portion of the rotation member. The furnace vessel according to item 8 or 9. 12. Any one of claims 6 to 10, characterized in that, in the region of the movable wall element section, the upper end surface of the refractory lining of the lower container is provided with a cooling element. 1
Furnace vessel described in one. 13. In the tapping area, the inner upper edge of the refractory lining of the lower vessel is substantially vertically aligned with the inner surface of the wall element arranged at that location of the upper vessel. A furnace vessel according to any one of the ranges 6 to 12. 14. Claim characterized in that the furnace vessel is planar and approximately oval in shape, and that said upper vessel has a planar and straight segment on the narrow side of the vessel in the tap area. range 1
Furnace vessel according to item 3. 15. The furnace vessel according to claim 13, wherein the furnace vessel has a round cross-section, and the lower vessel has a bulge extending outward in the tap area. 16. The lower container has a planar shape in which two semicircular disc-shaped parts are connected on both sides of a rectangular part, and the hot water outlet is disposed at the edge of the container. A furnace vessel according to any one of claims 6 to 15. 17 consisting of a lower vessel for accommodating a bath of molten metal, with a refractory lining and a spout located at an offset position on the bottom, and a plurality of liquid-cooled wall elements above the lower vessel; A metal melting furnace, in particular an electric arc furnace, having an upper vessel with a lower edge supported above the edge and a maintenance opening located above the spout and closable by a cover. In the furnace vessel, the following (a),
A furnace vessel characterized by (b), (c), (d), (e), and (f). (a) The spout is disposed inside the lower container, which is elliptical in plan, along the long axis of the ellipse and near a wall element of the furnace container. (b) The upper container has a first container portion whose planar shape is in the form of a circular ring having a first center point at the center of the circle. (c) The lower container has a second container portion whose planar shape takes the form of a sector-shaped portion of a circular ring with the center of the circle having a second center point coincident with the first center point. (d) the lower container has a planar shape in the form of a sector-shaped portion of a circular ring, similar to the second container portion, and is arranged at a corresponding position on the opposite side with respect to the second container portion; and a third container portion having the center of the circle as a third center point that is displaced outwardly with respect to said second center point. (e) The lower container has a planar shape in which the second container portion and the third container portion are joined in a straight line or in a curved shape slightly bulging outward, so that the upper edge of the lower container The container has a fourth container portion having an oval shape. (f) the upper container is joined at its lower edge to the upper edge of the lower container in an elliptical shape, has the maintenance opening at a position above the spout, and connects the first container at its upper edge; and a fifth container portion joining the portion. 18. The furnace vessel according to claim 17, wherein the second vessel portion and the third vessel portion have a planar shape in the form of a semicircular ring sector. 19. The furnace vessel according to claim 17 or 18, wherein the lower vessel has an elliptical shape and is tiltable in the direction of the long axis of the ellipse. . 20. The fifth container portion has a stepped shape in the region transitioning from the first container portion to the third container portion and in the region transitioning from the third container portion to the fourth container portion. A furnace vessel according to any one of claims 17 to 19, characterized in that: 21. Claim 21, wherein the fifth container portion has an inclined shape in regions transitioning from the first container portion to the third container portion and the fourth container portion. The furnace vessel according to any one of items 17 to 19. 22 Patent characterized in that a pipe having a plurality of outlet openings is arranged along at least one edge of the maintenance opening, the pipe having a plurality of outlet openings oriented inwardly with respect to the plane of the maintenance opening. A furnace vessel according to any one of claims 17 to 21. 23 A lower vessel for containing a bath of molten metal, with a refractory lining and a spout located at an offset position on the bottom, and a plurality of liquid-cooled wall elements at the upper edge of said lower vessel. a furnace vessel having an upper vessel having a lower edge supported on the top of the furnace vessel; and a maintenance opening positioned above the spout and capable of being closed by a cover; ), (b), (c), (d), (e), (f), and (g). (a) the spout is arranged inside the lower vessel, which is elliptical in plan, along the longitudinal axis of the elliptical long axis and in the vicinity of a wall element of the furnace vessel; has been done. (b) The upper container has a first upper portion whose planar shape is in the form of a circular ring having a first center point at the center of the circle. (c) The lower container has a second container portion whose planar shape takes the form of a sector-shaped portion of a circular ring with the center of the circle having a second center point coinciding with the first center point. (d) the lower container has a planar shape in the form of a sector-shaped portion of a circular ring, similar to said second container part, and is arranged in a relative position opposite to said second container part; and a third container portion having the center of the circle as a third center point that is displaced outwardly with respect to said second center point. (e) The lower container has a planar shape in which the second container portion and the third container portion are joined in a straight line or in a curved shape slightly bulging outward, so that the upper edge of the lower container The container has a fourth container portion having an oval shape. (f) the upper container is joined at its lower edge to the upper edge of the lower container in an elliptical shape, has the maintenance opening at a position above the spout, and connects the first container at its upper edge; and a fifth container portion joining the portion. (g) three electrodes are arranged in a triangular row in the planar shape of the furnace vessel, and the distance between the centers of the electrodes is between the second center point and the third center point; is substantially equal to the distance of . 24. The arc furnace according to claim 23, wherein the second container portion and the third container portion have a planar shape in the form of a semicircular ring fan. 25. The arc furnace according to claim 23 or 24, wherein the lower container has an elliptical shape, and the lower container is tiltable in the direction of the long axis of the ellipse. . 26. The fifth container portion has a stepped shape in the region transitioning from the first container portion to the third container portion and in the region transitioning from the third container portion to the fourth container portion. An arc furnace according to any one of claims 23 to 25. 27. Claim 27, characterized in that the fifth container portion has an inclined shape in regions transitioning from the first container portion to the third container portion and the fourth container portion. The arc furnace according to any one of Items 23 to 25. 28 Patent characterized in that a pipe having a plurality of outlet openings is arranged along at least one edge of the maintenance opening, the pipe having a plurality of outlet openings oriented inwardly with respect to the plane of the maintenance opening. The arc furnace according to any one of claims 23 to 27. 29. Claim 23, characterized in that the lower container is of oval shape, and the electrode support arms for supporting the electrodes are arranged transversely with respect to the longitudinal axis of the lower container. 29. The arc furnace according to any one of items 28 to 28.