Energy consumption varies from 350-700 kWh/ton of steel produced. The “typical” EAF without oxyfuel burners uses 475 kWh/ton.
Are electric arc furnaces efficient?
The power consumption during the 1970s was approximately 600 kWh/t-steel, but today’s highly efficient EAF furnaces consume roughly 300 kWh/t-steel. The tap-to-tap time, which determines the productivity of the EAF, has decreased from 180 min to 40 min over comparable-sized heats in the past.
How many amps does an arc furnace use?
A mid-sized modern steelmaking furnace would have a transformer rated about 60,000,000 volt-amperes (60 MVA), with a secondary voltage between 400 and 900 volts and a secondary current in excess of 44,000 amperes.
What are the advantages of electric arc furnace?
What are the advantages? An electric arc furnace’s main advantage is the improved efficiency compared to a blast furnace. The EAF doesn’t require large amounts of fuel for combustion or the continuous addition of coke to the molten metal to achieve high purities.
What is the difference between induction furnace and electric arc furnace?
The induction furnace is heated faster and has higher thermal efficiency. The heat is generated in the furnace (liquid steel), so the heating speed is high. In the arc furnace, the heat of the arc after the material is cleared must be transferred to the molten steel through the slag, which is indirect heating.
How much does it cost to build an electric arc furnace?
THus, capex cost for a ~300kt electric arc furnace melt shop is closer to $300 / tonne of capacity.
Bar rolling mill investment cost summary.
|Average capacity||1170 kt|
|Average cost 2018||US $ 154 million|
|Average cost per tonne capacity||US $ 143 / tonne|
Does an electric arc furnace use coke?
Electric arc furnaces (EAF) tend to be much smaller and more efficient in their operation. They don’t need a constant supply of coke. Instead, they use electricity passed through graphite electrodes to create an arc.
How do you power an arc furnace?
- Power. The Arc Furnace accepts power at three large plugs behind the machine. …
- Electrodes. The furnace needs three Graphite Electrodes before working. …
- Smelting. The Arc Furnace can make ingots directly from ores (which are doubled), or it can do it from grits (which smelt in half the time).
What is electric arc furnace slag?
EAF slag is a rock-like material generated during the steel-making process. … EAF slag is used as an alternative to rock fragments, both in encapsulated uses (e.g., contained in concrete) and unencapsulated uses (e.g., loose ground cover material). It is commonly used as road base material.
What are some uses for electric arc furnace slag?
They are widely used in transportation industry, construction, and cement manufacturing as well as wastewater and water treatment. This makes slag an important substitute for natural resources, leading to significant minimization in natural resource utilization.
Which is disadvantage of electric arc furnace process?
Disadvantages: The quality of molten steel is greatly affected by scrap steel, the smelting period is longer, and the power consumption is larger. According to the above, the electric arc furnace uses scrap steel as the main raw material.
How does electric arc furnace work?
The electric arc furnace is used to reduce iron from iron ore. Heat is generated from an electric arc between electrodes. Oxygen is blown into the furnace, and lime and other materials are added to combine with the impurities and form slag. Molten iron is extracted and poured out via a tapping spout.
Which of the following is the maximum temperature limit of the electric arc furnaces?
The electric arc furnaces can achieve temperatures up to 1800 ⁰C.
Which is the main drawback of induction furnace in refining of steel?
The one major drawback to induction furnace usage in a foundry is the lack of refining capacity: charge materials must be free of oxides and be of a known composition, and some alloying elements may be lost due to oxidation, so they must be re-added to the melt.
How is steel made in an electric arc furnace?
Electric Arc Furnace (EAF) is a steel making furnace, in which steel scrap is heated and melted by heat of electric arcs striking between the furnace electrodes and the metal bath. … Three-phase AC Electric Arc Furnaces with graphite electrodes are commonly used in steel making.
What are the difference between direct and indirect arc furnace?
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.