FR2690365A1 - Heating device for a continuous metal casting installation. - Google Patents

Abstract

The present invention relates to a heating device for a continuous metal casting installation, comprising a distribution container, at the opening of the pouring spout of which a continuous casting shell is arranged and in which protrudes a burner operating with current. continuous, with which is associated a counter-electrode in contact with the molten material in the area of the opening of the pouring spout. - According to the invention, the counter-electrode (32) is a tubular segment made of a material conducting the current, which segment surrounds, in contact with it, the metal (61) leaving the distribution container (10).

Description

The present invention relates to a heating device

  for a continuous metal casting installation,

  carrying a dispensing container, at the opening of the casting nozzle which is arranged a continuous casting shell and in which projects a burner operating in direct current, which is associated with a counter electrode in

  contact with the molten material in the open area.

ture of the spout.

  Continuous casting plants usually

  a dispensing container filled with material flowing from a ladle, which container, for example in the case of a horizontal continuous casting plant, through an opening of the spout arranged near the bottom, and in the case of a

  continuous vertical casting installation, through

  In this way, in the document "Berg und Hittenmännischen Monatsheften", the molten material is fed to a shell.

  128th year, Issue 3, March 1983, is described a provision

  Continuous casting apparatus for steel, comprising

  a distributor having the opening of the spout, the nozzle arranged at this point, a rupture ring,

  and a horizontal continuous casting shell

  theirs, this document describes several possibilities for

cool the shell.

  Heating of the dispensing container is not provided.

  When a DC heater is used on the dispensing container, a counter-electrode is required. According to STEEL TIMES, July 1988, page 381, such a heating device is known, as well as by the patent. No. 4,686,687. The anode is furthermore arranged in the region of the opening of the spout. In detail, patent DE-3,339,514 shows the arrangement of a

  such electrode in heated containers, particularly ovens or chutes, in which a pin-shaped electrode is arranged in the refractory material.

  The electrode has channels for conducting a cooling fluid Electrical contact with the melt is effected by the electrode made of copper through the metal adhering to the head of the electrode.

  Counter electrodes of this type and of a similar type

  In each case, this involves a weak spot in the bottom of the container. This construction is expensive and its adaptation to the refractory material is difficult. Furthermore, the conduction of the current from the metal electrode to the melt is hampered.

  Patent DE-3,443,740 discloses a method and apparatus in which energy is supplied to molten metal in a receiving vessel via plasma burners. In this case, two burners are nevertheless used for

  which current is guided through the burners, so that no bottom electrode is needed.

  The object of the invention is to provide a heating device for a continuous metal casting plant, by which, with simple means, a supply of energy without

  loss and safe in service is guaranteed, while being able to fine tune the temperature of the molten material.

  For this purpose, the heating device for an installation

  continuous casting of the type described above is remarkable, according to the invention, in that the counter-

  electrode is a tubular segment consisting of a current conducting material, which segment surrounds, in the

  contacting, the metal coming out of the dispensing container.

  The fact that the counter-electrode of the distribution vessel heated by a DC burner is made of

  as a tubular segment, which surrounds, in contact with

  the bar emerging from the dispensing container, which is arranged at the opening of the spout of the dispensing container, causes the counter-electrode to be no weak point of the dispensing container,

particular of the bottom of the container.

  Thanks to the realization as a tubular segment, a large surface contact with the molten material and,

  thus, safe current conduction is guaranteed.

  The molten material, at the intended location at the opening of the pouring nozzle of the dispensing container, in the electrical contact zone, is either still liquid or pasty, so that the molten material is in intimate contact, each time, with the inner wall of the tubular segment

  realized as a counter-electrode.

  Advantageously, the material conducting the current of the segment

tubular is copper.

  Preferably, on the outer face of the tubular segment,

  there are provided channels through which a cooling fluid

dissement.

  In particular, the tubular segment surrounded by the cooling fluid can form the mouth of the outlet sleeve of the dispensing container, or the tubular segment surrounded by the cooling fluid can form a

  part of the casting shell continues.

  Advantageously, the tubular segment is the counter

  electrode of the heating device of a horizontal continuous casting plant comprising a dispensing container and a horizontally divided horizontal continuous casting shell 5, the material of the inner wall of the part facing the dispensing container being

  copper and that of the opposite part of the graphite.

  Thus, the counter-electrode has cooling channels

  With the correct setting of the temperature of the cooling fluid, the wear of the counter-electrode can be decreased.

  and, on the other hand, the heat removal of the settled melt.

  Thanks to the use of a simple cooling fluid relative to the thermal conduction, as a rule of water, it is possible to make the counter-electrode into

  In addition, by the flow of the metal, especially during the casting of steel, it is ensured that the quality of the contact is not diminished. by adhesions.

  When using the counter-electrode at the outlet sleeve in the flow direction of the material, before the shell, the heat discharge is adjusted so that the counter electrode is worn only minimally, that however the least possible heat

  is evacuated, and that the casting material remains very largely liquid.

  When using the counter-elecrode in the shell area in a horizontal continuous casting plant, the tubular segment made of copper, for a substantially unmodified construction, must be provided with current connections only. when the shell is split in two The molten material, in the area in the flow direction behind the rupture ring, is either still liquid or pasty, with the result that the thin crust of the bar is strongly supports against

  the inner surface of the tubular segment made of copper.

  The internal piercing of the shell is furthermore conically made, corresponding to the cooling and the reduction of the diameter of the bar. Thus, the supply of current to the bar is guaranteed, since the contact between the material fusion and the inner shell of the shell, which, in the case of a shell divided in two, may be made of copper and graphite, is guaranteed

on full-length.

  As burners, plasma burners can be used. Thanks to the arrangement of the counter-electrode in the area of the spout of the dispensing container, one obtains a

  better heat penetration In the case of an installation

  horizontal continuous casting, as also in the case of a vertical continuous casting plant, thanks to the fluid veins extending into the shell, both the mixture and the temperature or the transport of

  heat are positively influenced.

  The figures of the annexed drawing will make clear how

the invention can be realized.

  Figure 1 illustrates a continuous casting installation

  comprising a heating device.

  Figure 2 shows a continuous casting installation

horizontal.

  Figure 3 shows a vertical continuous casting installation. Figure 1 shows a heater 30 having a burner 31 protruding into a dispensing container 10 and a counter electrode 32 arranged in the region of the sleeve 12 of the spout above the dispensing container 10, can be positioned a ladle 50 from which the molten material 61 is fed to the dispensing container 10 through the opening 51 of the spout.

  casting which can be closed by means of a closing slide 52.

  The dispensing container 10 has a metal wall

  11 which is covered by a refractory lining 13. At the mouth of the sleeve 12 of the spout is arranged against the electrode 32.

  Figure 1 schematically shows a co-

  horizontal continuous casting keel 20 from which a bar 62 emerges.

  FIG. 2 shows the zone of the sleeve 12 of the spout, as well as the shell of a continuous horizontal casting installation. The sleeve 12 of the spout, provided with a

  refractory lining 13 of the dispensing container 10 is arranged horizontally.

  In the lower zone of this figure, at the mouth of the sleeve 12 of the spout, there is provided a tubular segment 14 which is made of a material which conducts the current well, for example copper. The tubular segment 14 is

  surrounded by a cooling element 15 which has openings for supply 16 or discharge 17 of the cooling fluid.

  In the direction of the flow behind the sleeve 12 of

  casting nozzle, is arranged a nozzle 21 which, in turn, is followed by a rupture ring 22 which is connected to the horizontal continuous casting shell 20 In the lower part, is represented a shell in one piece which has a inner envelope 25, as well as an envelope

  23 on the outer shell 23 of the shell, there are provided openings for the supply 26 and the discharge 27 of a cooling fluid.

  In the upper part of this figure, is represented a shell divided in two, the inner casing 25 is formed in the part facing the dispensing container 10, as a tubular segment 24 The material of the remaining part of the The inner casing 25 of the shell may be moreover graphite. On the outer shell 23 of the shell, there are again provided

  openings for the supply 26 or the evacuation 27 of the cooling fluid.

  In this figure, the melt is further represented

  61 and is indicated the solidification front of the bar 62.

  The area of the spout 12 in FIG. 3 corresponds, but in a vertical position, to that already shown in FIG. 2. In addition to this, the opening of the spout can be closed by a closing slide 18.25. no direct contact of the individual parts of the dispensing container 10 with the casting shell

continuous vertical 40 is provided.

  In the left zone of FIG. 3, the counter-electrode is arranged on the dispensing container 10 and a normal vertical continuous casting shell 30 is used, comprising an outer casing 43 and an inner casing

  as well as openings for the supply 46 and the evacuation 47 of the cooling fluid.

  On the right-hand side of FIG. 3, a conventional sleeve 12 of the spout is provided, and the continuous casting shell 5 has a tubular segment 44 formed as a counter-electrode 32, at the level of the inner casing 45 of

  the shell in the area facing the dispensing container.

  The electrical connection between the cathode burner and the anode tubular segment 44 is effected through the melt 61 when the slider 18 is

  open After a possible interruption of the shell filling process, the heater must be started again.

Claims (6)

  1 Heating device for a continuous metal casting plant, comprising a dispensing container, at the opening of the spout which is arranged a continuous casting shell and in which projects a burner operating in direct current, which is associated with a counter-electrode in contact with the molten material in the region of the opening of the spout, characterized in that the counterelectrode (32) is a tubular segment (14, 24, 44) consisting of a material leading to current, which segment surrounds, by   contacting, the metal (61) issuing from the dispensing container bution (10).   2 Device according to claim 1, characterized in that the material conducting the current of the   tubular segment (14) is copper.   3 Device according to Claim 1 or Claim 2, characterized in that channels (19, 29, 49) are provided on the outer face of the tubular segment (14, 24, 44).   traversed by a cooling fluid.   4 Device according to claim 3, characterized in that the tubular segment (14) surrounded by the cooling fluid forms the mouth of the sleeve   outlet (12) of the dispensing container (10).   Device according to claim 3, characterized in that the tubular segment (24,44) surrounded by the cooling fluid forms part of the   continuous casting shell (20,40).   Device according to claim 5, characterized in that the tubular segment (24) is the counter-electrode (32) of the heating device (30) of a horizontal continuous casting plant comprising a dispensing container (10) and a Horizontal continuous casting shell (20) radially divided, the material of   the inner wall of the portion facing the dispensing container (10) being copper and that of the opposite portion of the graphite.