Question

Difference between direct arc furnace and indirect arc furnace

Answer 1

Answer:

the difference between an indirect and a direct arc furnace is that in a direct arc furnace,heat is subjected DIRECTLY to the material being heated while an indirect arc furnace,the arc burns above the charge thus is not direct and it doesn't form a part of the electrical circuit.

Explanation:

Answer 2

Explanation:

direct arc furnace

• Direct arc furnaces are very popular for the melting of alloy steels and range in size from a few kilograms, for laboratory units, to in excess of 100 tonnes per batch.
• The furnace generally consists of a cylindrical steel shell which is lined with acid or basic refractories
• The distance between the electrodes and the metal bath is automatically controlled and determines the power input into the bath.

Indirect arc furnace

• It consist of a horizontal barrel shape steel shell lined with refractories.
• The barrel shaped shell is designed to rotate and reverse through approximately 180°C in order to avoid excessive heating of the refractories above the melt level and to increase the melting efficiency of the unit.
• Indirect arc furnaces are suitable for melting a wide range of alloys but are particularly popular for the production of copper base alloys. The units operate on a single-phase power supply and hence the size is usually limited to relatively small units.

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