Dedusting Equipment of Electric Furnace System 1

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

Q:What is the difference between industrial furnaces and boilers?: Hot water or steam generated in the boiler can directly provide necessary energy for industrial production and people's life, but also by the steam power device is converted to mechanical energy, or through the generator converts mechanical energy into electrical energy. Hot water boilers are called hot water boilers. They are mainly used in daily life, and are also used in industrial production. Steam generating boilers are called steam boilers, often referred to as boilers. They are used in thermal power stations, ships, locomotives and industrial and mining enterprises.

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:Should the industrial furnace shell cool down?: If the furnace shell temperature is too high, it shows that the lining is not good or damaged, so it should be repaired in time. If you do not repair, take the cooling way, undesirable. Because this will cause a lot of heat loss, resulting in waste of energy, increase production costs, and affect the service life of the furnace.

Q:What is the difference between industrial furnace masonry and ordinary masonry?: Industrial furnace masonry requirements are relatively high, industrial furnaces of different uses, whether material or masonry process, have strict requirements.

Q:How to use industrial furnace equipment?: The protection device of the exposed transmission department shall be installed with the correct installation position. The structure is reasonable. The wire rope pulley of the furnace car shall be intact and undamaged. All the pulleys and sprockets on the furnace are in good condition, without defects and flexible in rolling.

Q:Why does the burner of industrial furnace burn occasionally?: The basic structure of the complete ignition system is the ignition device and flameout protection device. The ignition burner includes an ignition electrode and an igniter (equipped with some external type transformer, voltage transformer) through the above 10kV, the ignition electrode spark ignition of high voltage discharge to ignite gas column.

Q:What are the companies in the world that are currently engaged in metallurgical furnaces?: Basically, no industrial furnace manufacturer can do all types of stoves.Often associated with the industry is very large,so your ranking is basically meaningless.

Q:Brief introduction to repair of industrial furnace: The industrial furnace is the main production equipment in the machinery industry. The repair of industrial furnace directly affects the quality, high yield, long life, low consumption and safe production of the furnace.

Q:How many kinds of industrial electric furnaces are there?: Industrial furnace according to the heating mode is divided into two categories: one is the fuel furnace, combustion heat with solid, liquid or gaseous fuel in the furnace for heating the workpiece; the second is in the furnace, the furnace converts electrical energy to heat the heat.

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.

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