SU1392324A1 - Induction electric-arc furnace - Google Patents

Abstract

The invention relates to the field of metallurgy, in particular to induction-arc furnaces for smelting alloys. The purpose of the invention is to increase the productivity of the furnace, improving the quality of the metal, reducing the consumption of electrodes, refractories and electricity. This goal is achieved by arranging the phase coils on the flange walls above the bath. Jars of this axis of the inductor phase coils are located at an angle of 90 relative to the axes of the respective phase electrodes, the inductor coils being connected to a transformer, the primary circuit of which is common with the power transformer. The melting period is reduced by a factor of three. 1 tab., 3 Il. e cl

Description

I The invention relates to metallurgy: rot, in particular to induction-arc-type furnaces for smelting alloys.

The purpose of the invention is to increase the productivity of the furnace, improve the quality of the metal, reduce the consumption of electrodes, refractories and electricity.

FIG. 1 shows an induction arc furnace, a longitudinal section; in FIG. 2, a zhB, a cross section of the rio window and the plate in FIG. 3 - electric connection diagram of the furnace.

chi In the process of melting, the phase electrodes are in the rotating magnetic field of the inductor. At the same time, each phase electrode and an electric arc from the side of a magnetic field are affected by an electromagnetic force in a certain direction.

It is known that during the operation of an arc furnace, the electrodes and the electric arcs are repelled from each other by an electrodynamic interaction between themselves. Therefore, to get rid of the harmful electrodynamics

An induction-arc furnace 1 with inclusive forces, the inductor has its own melting space 2 and bath 3. Moreover, the inductor 4 is installed around the melting space 2 in the form of a closed ring, the inner side of which is fixed with water-cooled flat coils ; ki 5 of the inductor 4; the coils 5 embed the entire side surface of the lining b, bounding the furnace itself, so that the axes 8 of the phase coils 5 are at an angle of 90 to the axes 9 of the arrangement of the phase electrodes 7 in plan. Compensation of harmful electrodynamic forces leads to a decrease in the consumption of electrodes due to the reduction of vibrations, as well as to an increase in the service life of the lining due to the deviation of the arcs to the center of the furnace, which reduces the radiation to the walls. The consumption of electrodes is reduced due to breakage due to unscrewing.

space 2.

The inductor 4 with respect to the electrodes 7 is installed in such a way that the axes 8 of the phase coils 5 of the inductor 4 are rotated by 90 relative to the axes 9 of the arrangement in terms of the corresponding phase electrodes 7.

The magnetic core 10 of the inductor 4 is made in the form of a closed ring and is assembled from individual plates of cold rolled sheet steel. In the places of the openings of the window 11 and the notches 12 of the magnetic wire 10 has a thickening 13, the cross-sectional area in any cross section of the magnetic core 10 is constant. Phase electrodes 7 electric arc furnaces based on DSV-50.

The cells are connected to the power transformer 14, and the inductor 4 is electrically connected to the transformer 15. The transformers 14 and 15 are electrically connected to the high voltage line 16.

Induction arc furnace works as follows.

The melting space of the furnace (the melting space 2 and the bath 3) is filled with scrap, after which the phase electrodes 7 and the inductor 4 are put into operation. The phase electrodes introduce energy into the middle of the melting space and the inductor introduces energy into the peripheral area. Such a uniform distribution of the energy introduced into the furnace, taking into account the increase in the input energy (from two sources), dramatically increases the productivity of ne

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Claims (1)

The results are shown in the table. The use of the proposed arc-armature furnace provides, in comparison with the known electric furnaces, the following advantages of increased productivity, reduction of metal losses; removal of electrode losses; increase the resistance of the lining; shortened 3 times the melt period; Saving the number of furnaces in the workshop, working conditions by lowering the noise level of the furnace due to the fixed arc burning. Invention Formula Induction arc furnace, burning furnace bath with side coils with phase coils, phase electr 0 five 0 five the furnace circle so that the axes 8 of the phase coils 5 are at an angle of 90 relative to the axes 9 of the location of the phase electrodes 7 in the plan. Compensation of harmful electrodynamic forces leads to a decrease in the consumption of electrodes due to the reduction of vibrations, as well as to an increase in the service life of the lining due to the deviation of the arcs to the center of the furnace, which reduces the radiation to the walls. The consumption of electrodes is reduced due to breakage due to unscrewing. In the first melting period, when the loading part turns into dust and is carried away from the furnace, the rotating magnetic field interacts with electrically conductive dust particles through economizers and gas exhausters and causes it to rotate. In this case, the action of the centrifugal force of the pish is pressed against the walls of the smelting space, not overhanging it. This effect increases the productivity of the furnace. An example of the implementation of induction arc furnace on the basis of DSV-50. The results are shown in the table. The use of the proposed induction-arc furnace provides the following advantages in comparison with the known electric arc furnaces: an increase in the productivity of the furnace; reduction of metal losses; reduction of electrode losses; increase the resistance of the lining; a 3-fold reduction in the melting period; reducing the number of furnaces in the shop; improvement of working conditions by reducing the noise level of the furnace due to stable, fixed arc burning. Invention Formula Induction arc furnace containing furnace bath with side walls, phase coils, phase electrodes and a power transformer, characterized in that, in order to increase the productivity of the furnace, improve the quality of the metal, reduce the consumption of electrodes, refractories and electricity, the phase coils are located on the side walls above Elektordugova oven DSV-50 50 Induction arc furnace 50 b a bath with an offset of the irx axis at an angle of 90 relative to the axes of the respective phase electrodes, and the furnace is equipped with a transformer to which the phase coils are connected, the primary circuit of the transformer being in common with the power transformer. 12 8.4 120 760 20 150 600 Fig. / X FIA.Z V 2