Continuous feeding device for electric arc furnace preheated by flue gases

[0020] The present invention will be further described below with reference to the drawings and embodiments.

[0021] As shown in the figure, the electric arc furnace continuous feeding device using flue gas preheating in this embodiment includes a double-channel conveying trough 1 and a smoke hood 2. The double-channel conveying trough 1 has a higher feeding end and an outlet The material end is inclined and arranged in a form with a low material end. A carrier plate 3 with a flue gas channel is arranged in the middle of the double-duct conveying trough 1, above the carrier plate 3 is a material flow duct 11, and below the carrier plate is a flue gas flow The duct 12, the upper part of the material circulation duct 11 is an opening, the high end of the flue gas flow duct 12 is closed, and the fume hood 2 is provided with a seal that cooperates with the upper opening of the lower end of the material circulation duct 11 Door 4.

[0022] When this device is used for feeding, the materials are added from the high end of the material circulation duct 11 and discharged into the electric furnace from the lower end of the material circulation duct 11. By adjusting the sealing door 4 to make it close to the material, the smoke hood 2 is connected to the exhaust system through the hot smoke exhaust port 21 on it. The negative pressure is established in the smoke hood 2 under the action of the extraction system, and the sealing door 4 can To prevent the high-temperature flue gas in the electric furnace from entering the fume hood 2 from above the material, the high-temperature flue gas in the electric furnace enters the flue gas flow duct 12, and penetrates the material into the fume hood 2 from below the material through the carrier plate 3. The flue gas is in full contact with the material in the process of passing through the material. The flue gas stays in the material for a long time. The material can fully absorb the heat of the flue gas. The preheating effect of the material is greatly improved. And by adjusting the opening of the sealed door 4, it can also Properly adjust the material preheating temperature and preheating parts to achieve the best preheating effect; under the same preheating effect conditions, the size of the device can be greatly shortened. In addition, the double-channel conveying trough 1 is set at an inclined angle, the feeding point is increased, the chute angle is larger, and the scrap steel material blanking point is easier to approach the high temperature zone of the furnace center, reducing or eliminating the cold zone phenomenon in the sidewall feeding electric arc furnace; The flue gas diffuses from bottom to top, and the dust in the flue gas is greatly reduced, which solves the problem of pipe blockage.

[0023] As an improvement to this embodiment, the low end of the flue gas flow duct 12 is longer than the low end of the material flow duct 11, and the extended part forms the furnace inlet section 5 connected with the electric furnace; this structure makes the material flow from the material flow duct After the passage 11 comes out, it first enters the furnace section 5, and then enters the furnace from the furnace section 5; the high-temperature flue gas in the furnace needs to pass through the material that falls into the furnace section 5 from the material circulation duct 11 and then enters the flue gas flow duct , The flue gas preheats the material during the process of penetrating the material. This structure can reduce the opening size of the furnace body and reduce air leakage.

[0024] As an improvement to this embodiment, a receiving section 6 is provided at the high end of the material circulation duct 11, and the receiving section 6 is used to cooperate with the cold feeding device 7 to receive the material discharged from the cold feeding device 7; the cold feeding device 7 It can be adjustable long material trough, fixed chute, vibrating chute, various conveyor belts, etc. In specific implementation, the junction of the cold charging device 7 and the receiving section 6 needs to be sealed, so that the high-temperature flue gas in the electric furnace can enter the fume hood 2 under the action of the exhaust system.

[0025] As an improvement to this embodiment, the carrier plate 3 is composed of unit plates arranged in a stepwise manner along the longitudinal direction of the double-duct conveying trough 1. The inclination of the unit plates can be designed to be twisted and adjustable; the flue gas channels are adjacent In the gap between the unit plates, the orthographic projections of the ends of the adjacent unit plates overlap on the horizontal plane; the material carrying plate 3 of this structure can prevent materials from falling into the flue gas flow channel 12 from the flue gas channel and avoid material jams Stay in the flue gas channel; of course, in specific implementation, the orthographic projection of the ends of adjacent unit plates on the horizontal plane can also be in a butted state. Or the material carrier 3 can also be an integral board with vents, but the vents should be designed reasonably to avoid material jamming and material leakage.

[0026] As an improvement to this embodiment, the unit boards are arranged obliquely along the material advancing direction, this structure can make the material move more smoothly; of course, in different embodiments, the unit boards can also be arranged horizontally; in this embodiment, The material carrier 3 is a flat plate. Of course, it can also be an arc-shaped plate in different embodiments, which has better strength and can increase the air gap of the material.

[0027] As an improvement to this embodiment, a burner 8 is provided above the upper opening of the material circulation duct 11. The burner 8 can burn harmful gases such as dioxins in the flue gas and reduce air pollution; The burner 8 discharges high-temperature gas, which can preheat the surface material and further improve the material preheating effect.

[0028] As an improvement to this embodiment, the present electric arc furnace continuous feeding device using flue gas preheating also includes a vibrating feeding device 9 arranged at the bottom of the double-duct conveying trough 1. The vibrating feeding device 9 drives the material to move forward, which can make the material move forward. The flow is smoother to avoid material jams.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be implemented Modifications or equivalent replacements without departing from the purpose and scope of the technical solution of the present invention should be covered by the scope of the claims of the present invention.