The Advantages And Disadvantages Of Electric Arc Furnace

The Advantages And Disadvantages Of Electric Arc Furnace

There are several essential elements that caused the evolution of the electric arc furnace:

1) The increasing quantity of scrap steel;

2) The rapid development of the entire steel industry. The supply and the price of electricity become stable, which makes it possible to generalize the arc furnace;

3) The arc furnace tends to be larger and more powerful;

4) Less investment, quick to construct, and fast cost recovery;

5) The temperature and the component of the molten steel can be controlled with accuracy. The arc furnace can also smelt various kinds of different steels.

Compared with others, the electric arc furnace also has several obvious advantages:

1) The arc furnace can heat the furnace and the steel up to 4000-6000℃ directly and smelt special steels that contain refractory elements like W and Mo.

2) The arc furnace could remove the toxic gases and the inclusions while deoxidizing and desulfurating.

3) High flexibility. The arc furnace is capable of engaging production continuously or intermittently.

Currently, owing to the development of related technologies, the electric arc furnace could be well-integrated with traditional steel-making processes. But there are also several deficiencies that need to be improved:

(1) The arc can only generate point-like heating sources, which will cause uneven heat distribution in the furnace.

(2) The arc will react with the furnace gases and vapor and release large quantities of H2 and N2.

With further improvement of the electric arc furnace, new smelting techniques will embrace a brighter prospect.

Types Of Furnaces --- Open Hearth Furnace（Three）

Types Of Furnaces --- Open Hearth Furnace（Three）

Open Hearth Furnace:

The open heart process is also called a Siemens-martin process i.e. steel making technique for most of the applications in the 20th century. This process seeks a means to increase the temperature in a metallurgical furnace that uses the waste heat given out from the furnace that directs the fumes from the furnace through a brick checker work. A brick is heated to a high temperature, and then it is introduced into the furnace. The device is first used to produce steel that is charged with pig iron and wrought iron along with their scrap. The US and Britain are best suited to the open hearth process.

Natural gas or atomized heavy oils are used as fuel. The air and fuel are heated before combustion. The furnace gets charged with blast furnace iron in liquid form, steel crap that is combined with ore, limestone, dolomite, and fluxes. The roofs and body of the furnace are made of highly refractory materials such as magnetic bricks. 600 tons is the capacity of the open hearth furnaces that are installed in groups for massive auxiliary equipment, that is needed to charge up the furnaces and to handle the liquid steel that can be employed efficiently. It is most commonly used in industrial applications such as electric arc furnaces and oxygen process-based furnaces.

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