The power is supplied through the electrodes placed in the furnace, which produce an arc of electricity through the scrap steel ( around 35 million watts ), which raises the temperature to 1600 ̊C, melting the scrap. Any impurities may be removed through the use of fluxes and draining off slag through the taphole.
How much power does an electric arc furnace use?
To produce a ton of steel in an electric arc furnace requires approximately 400 kilowatt-hours (1.44 gigajoules) per short ton or about 440 kWh (1.6 GJ) per tonne ; the theoretical minimum amount of energy required to melt a tonne of scrap steel is 300 kWh (1.09 GJ) (melting point 1,520 °C (2,768 °F)).
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 will you produce steel by using electric arc furnace?
- The furnace is charged with the material.
- The roof is lowered and closed.
- Electrodes are lowered onto the material to form the arc between the material and the electrodes.
- Arc is struck at a lower voltage which is thereafter increased to speed up the melting process.
What is power factor of electric arc furnace?
The furnace is normally operated near maximum arc power, which corresponds to a power factor of 70% [9].
Do electric arc furnaces use coke?
The Electric arc furnace is smaller and more efficient. They do not require a constant coke supply ; instead, they use electricity carried through graphite electrodes to create an arc. ... Managing the temperature within the system is easier than a blast furnace, making it more efficient.
Do electric arc furnaces use coal?
Electric arc furnaces do not use coal as a raw material , but many are reliant on the electricity generated by coal-fired power plant elsewhere in the grid. Around 150 kg of coal are used to produce 1 tonne of steel in electric arc furnaces.
Do electric arc furnaces run continuously?
Electric arc furnaces typically produce up to 150 tons per batch. Batch production time with an electric arc furnace averages around 90 minutes. Examine the typical life value and any associated routine maintenance costs for each furnace type. Blast furnaces are known to run continuously for four to 10 years .
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 much is an electric arc furnace?
| Parameter Value | Average cost 2018 US $ 154 million | Average cost per tonne capacity US $ 143 / tonne | Sample size 3 records |
|---|
Which method of heating control has leading power factor?
In dielectric heating , the power factor is leading because of the capacitance.
Is a blast furnace better than a smoker?
Smokers are used to cook food items twice as fast as a regular furnace . It is the counterpart to the blast furnace, which is used to smelt ores, metal tools and armor. ... Fuel is used at double the rate of regular furnaces, so the number of items cooked per fuel stays the same.
What goes into an electric arc furnace?
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.
What is the difference between electric arc furnace and induction furnace?
What is the difference between electric arc furnace and induction furnace? Electric arc furnace uses electric arc generated by electrified electrode to melt metal and ore, while induction furnace uses electrified induction coil to heat and melt metal .
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.
How do you make an electric arc furnace?
- The furnace is charged with the material.
- The roof is lowered and closed.
- Electrodes are lowered onto the material to form the arc between the material and the electrodes.
- Arc is struck at a lower voltage which is thereafter increased to speed up the melting process.
