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Afișare Conținut Web
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Electric arc furnace

Process Description

Around 30% of the worldwide production of steel and iron takes place in electric arc furnaces. Many foundries also use electric arc furnaces with tapping weights from 5 to 40 tonnes for the melting of scrap, sponge iron and pig iron.   To increase economic efficiency there have been significant developments over the last decade in transformers, panels, furnace geometry, foam slag technology, automation, electrode regulation and hydraulics; and the use of oxygen is state of the art.  

An EAF consists of a hearth (a refractory wall forming the lower part of the furnace vessel with an opening for tapping), water-cooled panels and a lid with electrodes and exhaust gas opening.   

The oven is loaded with baskets from above by pivoting the lid and the electrodes to the side. Once the lid has been closed and the electrodes inserted, the melting process begins. By means of a light arc between the electrodes and feed material electrical energy is converted into thermal energy.    

Example of an electric arc furnace

Oxyfuel-technology supports the process, mainly through replacing electrical energy with chemical combustion energy.   

Advantages:

  • Savings in electrical energy
  • Minimising tap-to-tap times
  • Shorter power-on times
  • Savings in electrode consumption
  • Improvement in foaming slag technology  

  Example of application

Operating data

 

Minimum

Maximum

Charge weight

[t]

20

200

Tapped weight

[t]

17,6

162

Output

[%]

78

94

Power on time

[min]

15

160

Power off time

[min]

6

46

Tap to Tap time

[min]

35

203

Electrical energy

[kWh/t]

318

525

Oxygen consumption

[Nm³/t]

18

50

Natural gas consumption

[Nm³/t]

0

13

Total carbon consumption

[kg/t]

4

31

FeO in slag

[%]

28

46

Electrode consumption

[kg/t]

1

3,1

Tapping temperature

[°C]

1600

1720

 

Gas Application

  • Oxygen lance manipulator
  • Oxygen burner technology

 

Messer-Solution

With a cooperation partner, Messer offers a package of a modular design, consisting of oxyfuel burner systems with integrated supersonic oxygen injection and pneumatic coal dust feed, regulation and control of oxygen, fuel and carbon, as well as the entire automation with software.

Oxy-fuel burner system with integrated supersonic oxygen injection 

The optimal position, mounted just above the steel bath surface in the area of the foam slag, distributed over the entire cross-section to avoid cold spots and ensure uniform scrap melting, as well as exact knowledge of the process workflows and continuous development of the entire system guarantee benefits to your business.