Used for refining medium-carbon, low-carbon, and micro-carbon ferroalloys. Electric furnace capacity is generally 1500 ~ 6000 kVA, using open or tilted cover. The former is similar to a reduction furnace and can be equipped with continuous self-baking electrodes; the latter is similar to electric arc steelmaking furnaces and uses graphite or carbon electrodes.
Control of smoke and dust in electric steelmaking furnaces (1) Electric furnace fume electric furnace fumes are generated during the melting period of the electric furnace, tapping, and refining outside the furnace. When oxygen is used for blowing, the maximum dust concentration in the flue gas is 10-20 g/m3 (standard). When smelting high-carbon steel, the amount of soot per ton of product is about 2-19 kg, which is slightly lower when smelting special steel and stainless steel. The amount of flue gas and soot generated varies greatly depending on the stage of operation of the furnace and the raw materials charged. Flue gas temperature as high as 1200 ° C and above, and contains carbon monoxide and hydrogen gas and other combustible gases, coupled with fine dust particle size, so the electric furnace steel dust removal has always been more difficult.
(2) Furnace flue gas control methods According to the practice over the years, the methods of controlling the electric furnace flue gas are: partial smoke exhaust method, that is, local exhaust hoods above slag outlets, tapping outlets, furnace doors, etc.; direct smoking method. (or fourth hole exhaust, roof exhaust), that is, open the fourth hole in the furnace lid to directly smoke the furnace flue gas; roof smoke exhaust method, can be the flue gas in the furnace and tapping, slagging The smoke that occurs at the time is discharged through the roof hood; the large enclosure, that is, a closed hood is built outside the entire electric furnace, and flue gas is drawn from it. Loading, tapping, and other operations are accomplished through the open door on the cover and the movable top cover on the top of the cover, which can greatly reduce the cost of pollution control devices and reduce noise pollution.
Dust-laden gas enters the ash hoppers of each unit through the diversion pipe. After the granule dust is separated from the ash hopper diversion system, it directly falls into the ash hopper. The rest of the dust enters the middle box filter zone along with the airflow, and the filtered clean gas passes through. The filter bag is discharged through the upper case, the poppet valve, and the exhaust pipe. With the progress of filtration, when the dust concentration on the surface of the filter bag reaches a certain amount, the poppet control device closes the poppet valve according to a set procedure, opens the electromagnetic pulse valve, blows off the dust on the filter bag, and falls into the ash bucket. The exhaust valve discharges. The series of dust collectors are equipped with a bypass flue. When the boiler (or incinerator) is started, the bypass flue is opened to prevent the fuel from burning when the ignition is not good, the oil sticks to the filter bag, and the filter bag is burned in case of an open flame. . The bypass is opened when the temperature of the boiler exhaust smoke filter exceeds the allowable temperature. The series of dust collectors is also equipped with a leak detection device consisting of multiple probes (one per chamber) and an air cannon at the hopper.
Control of smoke and dust in electric steelmaking furnaces (1) Electric furnace fume electric furnace fumes are generated during the melting period of the electric furnace, tapping, and refining outside the furnace. When oxygen is used for blowing, the maximum dust concentration in the flue gas is 10-20 g/m3 (standard). When smelting high-carbon steel, the amount of soot per ton of product is about 2-19 kg, which is slightly lower when smelting special steel and stainless steel. The amount of flue gas and soot generated varies greatly depending on the stage of operation of the furnace and the raw materials charged. Flue gas temperature as high as 1200 ° C and above, and contains carbon monoxide and hydrogen gas and other combustible gases, coupled with fine dust particle size, so the electric furnace steel dust removal has always been more difficult.
(2) Furnace flue gas control methods According to the practice over the years, the methods of controlling the electric furnace flue gas are: partial smoke exhaust method, that is, local exhaust hoods above slag outlets, tapping outlets, furnace doors, etc.; direct smoking method. (or fourth hole exhaust, roof exhaust), that is, open the fourth hole in the furnace lid to directly smoke the furnace flue gas; roof smoke exhaust method, can be the flue gas in the furnace and tapping, slagging The smoke that occurs at the time is discharged through the roof hood; the large enclosure, that is, a closed hood is built outside the entire electric furnace, and flue gas is drawn from it. Loading, tapping, and other operations are accomplished through the open door on the cover and the movable top cover on the top of the cover, which can greatly reduce the cost of pollution control devices and reduce noise pollution.
Dust-laden gas enters the ash hoppers of each unit through the diversion pipe. After the granule dust is separated from the ash hopper diversion system, it directly falls into the ash hopper. The rest of the dust enters the middle box filter zone along with the airflow, and the filtered clean gas passes through. The filter bag is discharged through the upper case, the poppet valve, and the exhaust pipe. With the progress of filtration, when the dust concentration on the surface of the filter bag reaches a certain amount, the poppet control device closes the poppet valve according to a set procedure, opens the electromagnetic pulse valve, blows off the dust on the filter bag, and falls into the ash bucket. The exhaust valve discharges. The series of dust collectors are equipped with a bypass flue. When the boiler (or incinerator) is started, the bypass flue is opened to prevent the fuel from burning when the ignition is not good, the oil sticks to the filter bag, and the filter bag is burned in case of an open flame. . The bypass is opened when the temperature of the boiler exhaust smoke filter exceeds the allowable temperature. The series of dust collectors is also equipped with a leak detection device consisting of multiple probes (one per chamber) and an air cannon at the hopper.
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