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:Heat treatment equipment (industrial furnace), which products generally contain what kind of, which industries need to use heat treatment industrial furnace equipment.
Heat treatment furnace is mainly for the mechanical processing and casting industry workpiece annealing, quenching, carburizing, quenching and tempering, heat treatment 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.
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:What is the difference in structure between industrial furnace and boiler?
From the way: industrial furnace (electricity, natural gas, gas, induction heating is considered electricity), boilers (coal, all kinds of hot exhaust gas, a variety of gas, seemingly less electricity).
Q:Why does the burner of industrial furnace burn occasionally?
The flameout protection system is made up of burner controller, electromagnetic valve and flame detector, and the flame detection mode is mainly based on the two forms of ultraviolet detection and electrode detection. By utilizing the electric conductivity of the flame, the circuit path of the combustion process generates a weak current, and when the signal amplifier is amplified, the flame is induced to exist, and the small power burner adopts the detection mode more, and is economical and practical.
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:Brief introduction to repair of industrial furnace
The working condition of industrial furnace is very bad. It is affected by high temperature, slag erosion and burden wear. Therefore, its working condition changes quickly and its service life is short.
Q:What are the advantages of a vacuum furnace?
No pollution to the environment, no need for three wastes treatment.
Q:How to use industrial furnace equipment?
When the furnace is used, the lifting mechanism of the furnace door must be in good condition, and the wire breakage of the steel wire is not allowed to exceed the designated value. The weight should be properly allocated, and the drive department shall be provided with a protective cover.
Q:Selection of heat preservation material for industrial furnace
Micro nano heat insulation board.The thermal conductivity of micro nano heat insulation board is very low, only a fraction of the traditional thermal insulation material, and the insulation effect is very efficient.

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