DC Electric Arc Furnace

• Capital cost is comparatively less to DC EAF as there is no requirement for a rectifier and its controls.

• Generates less amount of higher order harmonics, hot iron metal can be directly charged as raw material.

• Keeping the power electrical common, two separate shells can be used continuously for production

• The operation is more stable than the DC EAF electric arc furnace. The melting is uniform.

• It has reduced electrode consumption because of the system regulations. Electrode consumption is reduced to around one-third. However, there is a need to improve the spalling and cracking of the electrodes. Lower consumption of electrodes makes it possible to make low-carbon heat.

• It has lower lining wear. Refractory consumption is less on the side walls but more on the bottom. Overall saving in refractory consumption is in the range of 15 % to 25 %.

• There is convection stirring in the bath.

• The temperature distribution of the bath is better than the DC EAF. Better temperature distribution results in improved heat distribution. The hot spots on the furnace wall in the case of AC-EAF are not there.

• Noise levels are much lower than the DC EAF (reduced from 105 dB to 85 dB).

• Installation costs are higher than the DC electric arc furnace (around 10 % to 35 % more).

• Operating costs are lower than the DC electric arc furnace (around 15 % to 20 % less).

• There is less network disturbance. There is a sharp reduction in the flicker effect. Flicker level and flicker frequency are reduced by half. The need for Var compensation equipment is much lower.

• There is lower energy consumption than the DC EAF. There is a 5 % to 10 % savings in power.

• Bottom electrodes make the furnace bottom complicated.

• It has lower levels of dust and gas emissions.

When selecting an AC electric arc furnace manufacturer/supplier, it is essential to consider its expertise, technology offerings, and after-sales support. A reliable AC electric arc furnace manufacturer/supplier will provide advanced AC EAF systems tailored to your production requirements. 

• PLC controls provide a high degree of automation, enabling fast heating speeds and a stable, reliable production rhythm. These systems allow electric arc furnace manufacturers to configure the smelting process according to customer requirements without stopping operations.

• With the flexibility to implement different control schemes — such as constant power, constant current, constant impedance, and constant voltage — electric arc furnace suppliers can ensure convenient and efficient production.

• The DC Electric Arc Furnace (DC EAF) also supports voltage regulation on load and current regulation without polarity. During the smelting process of the DC EAF, operators can adjust the voltage level up or down as needed without halting the machine. Current adjustments are precise, allowing changes in increments of just 1 ampere, which is crucial for electric arc furnace companies aiming for optimal performance and reliability.

• During the smelting process of the DC arc furnace, the polarity of the positive and negative electrodes can be arbitrarily changed, resulting in a uniform furnace temperature, effectively solving the defect of uneven temperature inside the furnace caused by the anode effect, the arc length of the DC electric arc furnace can be adjusted arbitrarily without power outage as needed. It can be used for both submerged electric arc furnace and open arc smelting, and various materials can be melted to achieve a 2-in-1 composite multifunctional use (electric arc furnace+submerged arc furnace).

• The main control board of the DC EAF power supply has a soft start function to avoid the phenomenon of damaging the electrical components of the thyristor due to high voltage impact upon startup. This board has a photoelectric isolation function, which can effectively prevent strong magnetic fields from interfering with the stability of the control circuit during the production process. The board also has overvoltage, overcurrent, phase loss, and high-temperature protection functions, which can effectively avoid damage to the equipment caused by short circuits.

• The DC electric arc furnace features a high center temperature at the electrode, generating concentrated heat that facilitates deep electrode burial. This characteristic, coupled with the furnace bottom's stability, makes it particularly suitable for smelting products with high melting points. For electric arc furnace manufacturers/suppliers, this design ensures efficient melting processes. Electric arc furnace companies can leverage the advantages of the DC EAF to enhance their product offerings.

By partnering with a trusted DC electric arc furnace manufacturer, you can ensure that your investment in DC EAF technology delivers maximum returns while meeting your production and environmental goals. Choosing the right DC electric arc furnace supplier is a critical step in achieving long-term success.