Preheating Scrap Steel Continuous Feeding System Based on Electric Arc Furnace Waste Heat Recovery Channel and Its Application Method

Abstract

The invention discloses a scrap steel preheating and continuous feeding system constructed based on a waste heat recovering channel of an electric-arc furnace and an application method of the system. The waste heat recovering channel of the electric-arc furnace is formed by connecting a flow guide tube, a transition tube, a heat exchange and material storing box and a preheating channel, wherein hot gas sequentially flows through the flow guide tube, the transition tube, the heat exchange and material storing tube and the preheating channel; a scrap steel storing box, a heat-resistant chain scraper conveyor and a hydraulically-controlled feeding trolley are mounted on a foundation of the waste heat recovering channel of the electric-arc furnace to form the scrap steel preheating and continuous feeding system; the scrap steel is conveyed from low to high through the chain scraper conveyor in the preheating channel and continuously fed into the heat exchange and material storing box to be stacked, and then the feeding trolley at the inner bottom part of the heat exchange and material storing box can continuously intermittently move to push the scrap steel by layers from the bottom into the electric-arc furnace to smelt; the scrap steel fed into the furnace is at the temperature exceeding 900 DEG C, and more than 120kW.H / T of electricity can be saved; the gas can be discharged from the preheating channel while being cooled to be 100-150 DEG C and then dedusted for later use, and thus the energy can be saved, and the consumption can be decreased; in addition, the continuous feeding system does not affect the automatic slag flowing and tapping works of the electric-arc furnace.

Description

technical field [0001] The invention relates to energy-saving supporting equipment for electric arc furnace steelmaking or casting and melting scrap iron and steel raw materials, in particular to a preheating scrap steel continuous feeding system based on an electric arc furnace waste heat recovery channel and a use method thereof. Background technique [0002] In modern electric arc furnace steelmaking or casting, the electric arc furnace adopts ultra-high power and enhanced oxygen technology to melt scrap steel, which greatly increases the amount of by-product gas in the electric arc furnace. Accounting for 15-20% of the total heat expenditure, converted into electric energy is equivalent to 80-120KW.H / T steel. In order to reduce energy consumption and recover energy, preheating scrap steel before smelting in the furnace, especially using the high-temperature gas discharged from the electric arc furnace to preheat scrap steel to increase the physical heat brought in by the...

AI Technical Summary

Problems solved by technology

[0032] A. Insufficient contact between gas and scrap steel, only the surface of scrap steel is heated and exchanged, and the preheating temperature of scrap steel is not high;

[0033] B. The high-temperature gas is extracted, and after combustion in the combustion chamber, the higher-temperature exhaust gas enters the waste heat boiler to generate steam. For large-scale steel enterprises, the smelting process of VOD furnaces in series requires steam; otherwise, it is necessary to find another way to use steam, which is not generally applicable.

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