Submerged Arc Furnace

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Submerged Arc Furnace

Submerged Arc Furnace Profile
Submerged arc furnace—it’s also known as electric arc furnace or resistance electric furnace. It is mainly used to reducing smelting ore, carbonaceous reducing agent and solvent etc. Mainly adapts to production of ferrosilicon, ferromanganese, ferrochrome, ferrotungsten, silicon manganese alloy and other ferrous alloys, it is an important smelting furnace in metallurgical industry for production of industrial raw materials and calcium carbide and so on chemical raw materials. The working character is to use carbon or magnesia refractory materials as furnace lining, use self roasting electrode. Electrode inserts into the materials inside the furnace for submerged arc operation, using arc energy and current through the materials, and due to the resistance of the materials and produce energy to melt metal. It’s a kind of industrial furnace which is worked continuously, charged material in succession, and tapped out metal or slag in intermittent.

Submerged Arc Furnace---Major categories and application

Category

Main raw-material

Final products

Reaction
temperature
( Celsius Degree)

Power
consumption
KWh/t

Ferroalloy
furnace

Ferrosilicon
furnace

(45%)
ferrosilicon

Ferrosilicon,
scrap iron,
coke

Ferrosilicon

1550-1770

2100-5500

(75%)
ferrosilicon

8000-11000

Ferromanganese furnace

Manganese
ore,
scrap iron,
coke, lime

Ferromanganese

1500-1400

2400-4000

Ferrochrome furnace

Chrome ore,
silica, coke

Ferrochrome

1600-1750

3200-6000

Ferrotungsten furnace

Tungsten
crystal
ore, coke

Ferrotungsten

2400-2900

3000-5000

Silicon chromium furnace

Ferrochrome,
silica, coke

Silicon chrome

1600-1750

3500-6500

Silicon manganese furnace

Manganese
ore,silica,
iron scrap,
coke

Silicon
manganese

1350-1400

3500-4000

Steelmaking electric furnace

Iron ore, coke

Pig iron

1500-1600

1800-2500

Calcium carbide furnace

Limestone, coke

Calcium carbide

1900-2000

2900-3200

Boron carbide furnace

Boron oxide,
coke

Boron carbide

1800-2500

 



Notes: The above is roughly value. According to the difference of the raw material composition, finished product components, electric furnace capacity and etc. the power consumption value will be much different.

Submerged Arc Furnace---Structure characteristics
Submerged arc furnace is a kind of industrial furnace which consumes much power. Full set equipment mainly consists of furnace shell, fume hoods, lining, short net, cooling system, exhaust system, de-dusting system, electrode shell, electrode lifting system, loading and unloading system, electrode holder, arc burner, hydraulic systems, submerged arc furnace transformer and various of electrical equipments.

Submerged arc furnace equipment is divided into three layer arrangement
The 1st layer is furnace body (including furnace bottom support, furnace shell, furnace lining), tapping system (including the ladle and ladle car.), arc burner etc.

The 2nd layer


1、Fume hood: At present, mostly of submerged arc furnace adopts closed or semi-closed low hood structure, with the characteristics of environmental protection, facilitate maintenance and improve the operation environment. The closed structure can also collect the exhaust gas (main ingredient is carbon monoxide) which is generated in the production and used in synthetically. Also can reduce the heat loss of the circuit, decrease the temperature of the electrode, and improve the operating environment.

2、Electrode holder: Most of submerged arc furnace with three-phase power supply. Electrode in triangle or inverted triangle, symmetrical position placed in the middle of furnace chamber. Large submerged arc furnace generally adopts anthracite, coke and coal tar pitch mixed as electrode material, in the process of smelting , it roasting by itself as electrode.

3、Short net

4、Copper tile

5、Electrode shell

6、Unloading system

7、Stoking machine

8、Fume exhaust system

9、Water-cooling system

10、Submerged arc furnace transformer

11、Operating system


The 3rd layer


1、Hydraulic system

2、Electrode press and release device

3、Electrode lifting system

4、Steel platform

5、Hopper and cycle material distribution car

Other additional: skew Bridge feeding system, electronic batching system, etc.


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