SU862404A1 - Arc furnace electrode holder retaining ring - Google Patents

Description

(54) ELECTRODE SUPPORT CLAMP

I

The invention relates to electrical engineering and can be used in ore-smelting arc furnaces of ferrous and non-ferrous metallurgy and the chemical industry.

The known design of the pressure ring of the electrode holder of an arc furnace, in which the pressure ring is made of non-magnetic steel. Making a pressure ring of non-magnetic steel allows it to receive low electromagnetic losses from eddy currents.

The disadvantage of this construction is that it can work only under conditions of relatively low temperatures, since it is not cooled with water.

At present, the pressure rings are made of conventional structural steel in welded form.

It is also known that the pressure ring of the electrode holder of an arc furnace, water-cooled and made of steel, is adopted for the prototype.

The disadvantage of this design is that during operation of the furnace in a pressure ring made of structural steel, there are electromagnetic losses from eddy currents due to the presence of a magnetic arc furnace.

th FIELD in the electrocontact unit of the electrode holder.

The mentioned losses in individual cases may amount to 1-2% of the total capacity of the furnace, which leads to a significant heating of the pressure ring and reduces its durability.

The aim of the invention is to increase the service life of the pressure ring.

This goal is achieved by the fact that the pressure ring of the electrode holder of the arc furnace is provided with a tight covering

10 in cross section with at least one water-cooled hoop made of copper.

The drawing shows the proposed device.

Pressure ring 1, water cooled and

15 made of steel, evenly covered by electrode 2.

A hoop 3 is tightly mounted around the cross section of the ring 1, made of a water-cooled copper tube.

20

Claims (2)

The hoop 3 is equipped with nozzles 4 for supplying and discharging cooling water, and between them in the hoop is made flat partition 5. The pressure ring of the electrode holder of the arc furnace works as follows. When the furnace is in operation, as a result of the flow of current in the electrode 2, magnetic flux occurs in the pressure ring 1 and an eddy current is induced, resulting in electromagnetic losses in the needle. In the hoop 3, located around the transverse cross section of ring 1, a current is induced by the vortex creating a magnetic flux directed towards the magnetic flux created by the current of electrode 2 in the push ring. Due to the presence of the hoop 3 in the steel pressure ring 1, the electromagnetic losses are reduced, since the resulting magnetic flux and the eddy current accompanying it are reduced. The number of hoops is determined by the calculation method depending on the amount of current flowing through the electrode. 2. For example, for a RPZ-BZ furnace with a electrode current of 90 kA, 4 copper water-cooling hoops are required, while the magnetic FLOW, eddy currents and heat losses in the pressure ring are reduced by 75%. A further increase in the number of rings does not lead to a significant reduction in electromagnetic losses in the steel pressure ring. Thus, the use of water-cooled copper hoops, tightly covering the cross-section of the pressure ring, improves the thermal conditions of the steel pressure ring and increases its durability. Claims of the invention The pressure ring of the electrode holder of an arc furnace, water-cooled and made of steel, is characterized in that, in order to increase the service life, the ring is provided with at least one water-cooled hoop made of copper tightly covering it in cross section.