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 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: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:Should the industrial furnace shell cool down?: Normally, the furnace shell temperature of an industrial furnace is below 50 degrees, so there is no need to cool down.

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: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:What is the difference between industrial furnace masonry and ordinary masonry?: Of course, the difference is like the difference between a hog cap and a 100 story building. See the industrial furnace manual.

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 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: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:What are the combustion equipments used in industrial boilers?: The boiler is an energy conversion equipment. The energy input to the boiler has the chemical energy and the electric energy in the fuel. The boiler outputs steam with certain heat energy and high temperature water.

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