Dedusting Equipment of Electric Furnace

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Dedusting Equipment of Electric Furnace

Furnace flue gas capture technology
At present, the mature method of furnace flue gas capturing are semi-closed cover type and diversion roof cover type. The diversion roof cover is actually combined by one semi-closed hood and roof cover.
△ Semi-closed cover
The semi-closed is composed of fixed cover and movable cover, the movable cover can remove to the top of transformer. Semi-closed cover is widely used in dust removal system of medium and small electric furnaces in recent years. Compared with roof cover, its advantages are: the system drafting amount is smaller, flue gas collection efficiency is higher, investment and operating costs are relatively low. Semi-closed cover can completely capture the flue gas during furnace smelting, however, its capturing efficiency of flue gas produced material loading and unloading is not satisfied and opening, closing of the  semi-closed cover has certain impact for the smelting period.
△Diversion roof cover
The diversion roof cover is composed of diversion cover and roof cover.
The diversion cover is composed of fixed cover and movable cover, the former is installed at material unloading side and at the back of furnace, while the latter is installed at the top of transformer behind furnace. The movable diversion cover will be moved to the top of transform during material feeding and be moved out of furnace proper during smelting. The fixed and movable diversion covers surround electric furnace, forcing the flue gas arising within the diversion cover area. After flue gas rises to the diversion cover hole, the distance between gas and cover is only 5m, which minimize the bad effect of transverse flue gas. After commissioning, the movable cover can be fixed and only be moved during maintenance so as to decrease operation procedures. The roof cover is inner and outer double layers structure. The inner cover will collect the flue gas flowed out from diversion cover along diffusion corner, while the outer cover will collect the overflowed flue gas.
The diversion roof cover can remove flue gas produced in smelting, which is environmental friendly and easy to be operated, but the disadvantages are that air discharging amount is large and investment, operation cost is high.
Flue gas collection technology of LF furnace
For the present, the mature methods of furnace flue gas capturingare semi-closed covertype and furnace cover type. The structure of semi-closed coveris same with that of electric furnace. The furnace cover is that the top of water cooling furnace cover of LF furnace is equipped with one round gas exhausting cover, which spares electrode incoming and outgoing holes in the middle position, the furnace cover and electrode moves simultaneously. Another kind of furnace cover is that gas exhausting pipes are connected to the sides of water cooling furnace cover. There is 100mm space between furnace cover and gas exhausting pipe.
Flue gas flow produced during LF furnace smelting is not large, which can be eliminated by the furnace cover, besides, the dedusting system is of low investment and operation cost.
Flue gas collection technology of AOD furnace
Compared with the common converter, AOD converter has the following characteristics: long smelting time, low oxygen blowing intensity, low decarburization speed and low CO content; therefore the flue gas recovery of AOD converter is .of little value.
Flue gas of AOD converter is collected bythe movable cover. The cover top is made of stainless steel plate and the cover inner wall is painted with refractory material. The CO-containing flue gas produced during smelting, fully combusts with induced air at the furnace hole, resulting high temperature flue gas up to 900 ~ 1600 ℃. AOD converter will produce certain dust during feeding and steel solution unloading. At the mean time, the high temperature flue gas should be cooled down by mixed air, so that AOD converter is specially equipped with the secondary dust collection device, which uses diversion roof cover, and mix the secondary flue gas with roof exhaust gas.

Performance comparison of various dust collector

Furnace cover

Rotarycover

Large closedcover

Roof cover

Traveler passing cover

Gas discharging outside of the furnace

Processed

Processed

Processed

Processed

Processed

Gas discharging inside of the furnace

Not processed

Processed

Processed

Not processed

Not processed

Dust collection rate

50%

70%

95%

40%

85%

Whole process collection

Poor

Poorer

better

good

good

Affect the operation

Poor

Poor

better

good

good

Occupied space

Small

smaller

bigger

big

big

Endurable capacity

Poor

Poorer

better

good

good

Noiseand heat radiation proof

Poor

Better

good

poor

poor

Air flow dealing

Small

Medium

Large

Highe

Large

Installation cost

Low cost

Medium

High

Highest

Higher

Operation cost

Low cost

Medium

High

Highe

Higher

Dedusting system process:

Specifications of AE series baghouse

Model

Air dealing volume (m3/h)

Filtering area
(m2)

Filtration velocity (m/min)

Operation resistance (Pa)

Emission concentration (mg/m3)

Inlet temp (℃)

Volume
(m3)

Total weight
(kg)

Ash cleaning gas pressure
(MPa)

Air consu
mption (m3/min)

AE1

10000

210-140

0.8-1.2

1000-1500

15-50

100-250

8000
×3000
×7000

4200-6250

0.4-0.6

2.5-3

AE5

50000

700-1050

0.8-1.2

1000-1500

15-50

100-250

9000
×5000
×15000

21000-31250

0.4-0.6

2.5-3

AE10

100000

1400-2100

0.8-1.2

1000-1500

15-50

100-250

9000
×11000
×20000

42000-62500

0.4-0.6

2.5-3

AE20

200000

2800-4200

0.8-1.2

1000-1500

15-50

100-250

14000
×11000
×20000

83000-125000

0.4-0.6

2.5-3

AE-40

400000

5600-8300

0.8-1.2

1000-1500

15-50

100-250

23000
×11000
×20000

167000-250000

0.4-0.6

2.5-3

AE60

600000

8300-12500

0.8-1.2

1000-1500

15-50

100-250

37000
×11000
×20000

250000-375000

0.4-0.6

2.5-3

AE-80

800000

11100-16700

0.8-1.2

1000-1500

15-50

100-250

50000
×11000
×20000

333000-500000

0.4-0.6

2.5-3

AE-100

1000000

13900-21000

0.8-1.2

1000-1500

15-50

100-250

58000
×11000
×20000

416700-625000

0.4-0.6

2.5-3

AE-120

1200000


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Q:What is the difference between industrial furnace masonry and ordinary masonry?
Furnace industry is not generally Mason walls, needs to have a professional operation and rich construction experience, high level of industrial furnace is difficult to get.
Q:What is the difference in structure between industrial furnace and boiler?
Industrial furnace: main heating, steel and other metal materials, or ore and other materials. An industrial furnace of higher temperature, such as forging or heat treatment. Therefore, the energy consumption is large, and the insulation layer is designed to be thicker, and the structure is designed for the final purpose of the production purpose, the product process and the production efficiency.
Q:How many kinds of industrial electric furnaces are there?
This series of electric furnace is made of super light refractory fiber. The electric stove and the temperature control cabinet matching use, the controller may automatically or the manual control electric stove temperature, may press the user request to provide the computer table or the computer control, does the multielement temperature measurement, guarantees the product quality. This series of electric furnaces are periodical operation type electric furnaces.
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:What are the advantages of a vacuum furnace?
The accuracy of furnace temperature measurement and monitoring is obviously improved. The indicating temperature of the thermocouple and the temperature of the furnace reach 1.5 C. But there is a large temperature difference in a large number of workpieces in different parts of the furnace. If the forced circulation of the rarefied gas is adopted, the temperature range of the temperature range of + 5 DEG C can still be controlled.
Q:What is an industrial furnace pit?
In twentieth Century 50s, coreless induction furnaces were developed rapidly. Later, electron beam kilns, using electron beams to impact solid fuels, strengthen the surface to heat and fuse materials with high melting point.
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
Compared with other equipment, industrial furnace repair has many characteristics: more repair times, more maintenance costs, more non-standard equipment and unsafe factors.
Q:What's the role of anchor bricks in industrial furnaces?
These layers need to be joined and anchored. Anchor brick is this role. The heat insulation layer at the horizontal section of the flue is mostly a narrow cavity.
Q:Heat treatment equipment (industrial furnace), which products generally contain what kind of, which industries need to use heat treatment industrial furnace equipment.
The main equipments of heat treatment are classified into two major categories: main equipment and auxiliary equipment. The main equipment includes heat treatment furnace, heating device, surface modification, surface oxidation device, surface mechanical enhancement device, cooling equipment, cold processing equipment, process parameter detection and control instrument; auxiliary equipment includes cleaning cleaning equipment, furnace atmosphere heating medium permeability meter preparation equipment, cooling device, quenching medium heavy transport machinery, quality testing equipment, power transmission line and auxiliary equipment, fire safety equipment, dust and other production fixture.

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