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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Q:How many kinds of industrial electric furnaces are there?
Electric furnace is divided into four categories: resistance furnace, induction furnace, arc furnace and special electric furnace according to the different ways of electric heating.
Q:What is the difference between industrial furnaces and boilers?
A boiler is a mechanical device for heating water into hot water or steam by the use of heat from fuel or other sources of energy. The original meaning of a pot is a water container heated by fire. The furnace is the place where the fuel is burned. The boiler includes two parts, the cooker and the furnace.
Q:Why does the burner of industrial furnace burn occasionally?
The general process for burner ignition, blowing furnace, electric spark ignition, solenoid valve, open the gas in case of delayed spark ignition, detection device detects the flame, the controller accepts signal so that the solenoid valve open, gas continuous normal combustion. However, if the ignition fails or the burner fires, the detector cannot detect the flame, which causes the solenoid valve to close and the burner flameout.
Q:How to use industrial furnace equipment?
If it is water cooling furnace door, but also to ensure the smooth flow of pipes, winter pipes are not frozen. When the boiler is in a limited position, the interlocking device for cutting off the power supply shall be provided when the furnace is in and out, and the number of broken wires in the pitch of the steel wire shall not exceed 10%, and the counterweight of the furnace door shall be reliably hung.
Q:What is an industrial furnace pit?
The creation and development of industrial kilns play an important role in the progress of mankind. Chinese appeared more perfect in the Shang Dynasty copper smelting furnace, furnace temperature is up to 1200 DEG C, up to 0.8 meters in diameter kiln stove.
Q:What are the companies in the world that are currently engaged in metallurgical furnaces?
Each manufacturer has its own industry and technological advantages.If you say that the performance rankings, turnover, and so on, it seems that no one has done this ranking.
Q:Selection of heat preservation material for industrial furnace
In the neutral and oxidizing atmosphere, the tensile strength, toughness and fiber structure can be maintained for long term use. The temperature is 950-1400 centigrade. Excellent chemical stability; excellent thermal stability; excellent tensile strength; low thermal conductivity; low thermal capacity; excellent sound absorption and noise reduction performance.
Q:What are the combustion equipments used in industrial boilers?
Main auxiliary equipment for general boilers:1. domestic appliances 2. civilian gas boiler 3. industrial gas furnace.
Q:Brief introduction to repair of industrial furnace
Although the number of industrial furnaces in general machinery plants is not large, the number of large repairs per year accounts for 16%-20% of the total number of repairs for all equipment, and the large repair costs account for about 18%-25% of the total repair cost of all equipment.
Q:What's the role of anchor bricks in industrial furnaces?
Anchorage brick is a new type of anchor brick relates to an industrial furnace, in particular to anchor brick of an industrial furnace roof, including column hanging end and the anchor structure, opened in the anchor on the surface of the spacing of the grooves in the anchor on at least one surface is arranged along the length direction ribs is provided with ribs, the ribs of the reinforcement and anchorage tension, tensile and flexural strength was obviously improved, the stress generated in the groove at the bar at the barrier can not continue to transfer, so the anchor brick of this kind of structure is not easy to break.

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