Continuous feeding device for electric arc furnace preheated by flue gases

Abstract

The invention discloses a continuous feeding device for an electric arc furnace preheated by flue gases. The device comprises a double-duct conveying trough and a flue gas guiding hood; a carrier plate with a flue gas channel is arranged in the middle part of the double-duct conveying trough; a material circulating duct is arranged above the carrier plate, and a flue gas circulating duct is arranged below the carrier plate; a seal gate matched with the upper opening of the lower end of the material circulating duct is arranged on the flue gas guiding hood; the double-duct conveying trough forms a flue gas diffusion heat exchanging mechanism from bottom to top, contact area between materials and high temperature flue gas is enlarged, the stay time of the flue gas is long, and the material preheating effect is greatly improved; as the double-duct conveying trough is arranged in an inclined way, the feeding point is raised, the trough bevel is large, the waste steel material blanking point can easily close to the center high temperature area of the furnace, so that the cold area phenomenon is eliminated; as the diffusion and heat exchange designs are realized, the powder dust in the exhausted flue gases is greatly reduced, the flue gas flowing is more in line with the natural rules, and the problems of exhaust pipe blockage and the like are solved.

Description

technical field [0001] The invention relates to metallurgical equipment, in particular to a charging device for an electric arc furnace. Background technique [0002] Energy saving, consumption reduction, and environmental protection in electric furnace steelmaking have always been one of the core technologies in the development of global electric furnace steelmaking technology. There have been many design schemes at home and abroad in the past twenty years, but because of its technical difficulty, only a small amount of technology has been put into practical use at present. 0013112A1), CONSTEEL (US5400358-1992) technology of vibration continuous feeding. Among them, due to the flue gas penetrating through the scrap steel layer, the preheating of shaft feeding has a good energy-saving effect, which can reach 60-100kw.h per ton of steel. However, the equipment is easily damaged by scrap steel, and the large amount of maintenance affects production. CONSTEEL is a horizontal ...

AI Technical Summary

Problems solved by technology

However, during the actual promotion process, it was found that due to the adoption of the flue gas decentralized down-pumping technology, the fine particles in the material are easily sucked into the smaller suction pipes, and the pipes will be blocked after settling and bonding. The negative pressure of the suction makes the light and thin materials stick to the clogged steps Gap, numerous exhaust pipes at the bottom of the ladder, and two total exhaust ports, the internal and external piping systems are complicated, and installation and maintenance are difficult, so this technology cannot be used in engineering applications

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