Full scrap steel electric arc furnace quasi-continuous steelmaking system and process

Abstract

The invention relates to the technical field of steelmaking, and provides a full scrap steel electric arc furnace quasi-continuous steelmaking system and process. Different media in electric arc furnace molten pools at two stations are dynamically injected in different times, melting down is accelerated through molten pool carburization, and the molten pool carbon content is increased; molten pooldephosphorization conditions are improved by changing a slag making process; two electric arc furnaces are arranged in high position and low position correspondingly, the first electric arc furnace in the high position is connected with the second electric arc furnace located in the low position through a buffer chute in the steel tapping process, molten steel is directly poured into the electricarc furnace in the low position through the buffer chute, the molten steel ladle-to-ladle efficiency is improved, after steel tapping is completed, the buffer chute returns to the home position, andthus the two electric arc furnaces are separated; and the processes of the two electric arc furnaces are dynamically matched, and high-efficient rapid quasi-continuous steelmaking is achieved. By applying the system and process, the phosphorus content of electric arc furnace smelted molten steel is lower than 0.010%, the power consumption per ton of steel is reduced by 10 kWh or above, the smelting cycle is shortened by 5 min or more, the molten steel cleanliness is obviously improved, the smelting pace is increased, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a quasi-continuous steelmaking system and process of an all-scrap electric arc furnace. Background technique [0002] In the smelting process of all-scrap electric arc furnace, the early stage of smelting is dominated by electric energy input and supplemented by chemical energy input, but relying solely on high-power input electric energy and chemical energy, its energy utilization efficiency is limited; Insufficient energy transfer between substances is slow, and the temperature of the molten pool is high after the scrap steel is melted, which makes it difficult to carry out the dephosphorization reaction inside the molten steel. In addition, due to the insufficient carbon content in the steel, the number of bubbles in the smelting process obviously cannot deeply remove [N] and [H] impurities, and it is difficult to cleanly smelt all-scrap electric arc furnaces. After the e...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a high-efficiency and low-cost all-scrap electric arc furnace quasi-continuous steelmaking system and process, which can solve the problems of high power consumption and long cycle in the electric arc furnace smelting process. Dynamic injection of different types of media in the molten pool of the two-station electric arc furnace in different periods of time, use of carburizing of the molten pool to accelerate melting, increase the carbon content of the molten pool, improve the dephosphorization conditions of the molten pool through changes in the slag making process, and use buffering in the tapping process The chute is connected to the two-station electric arc furnace to improve the efficiency of molten steel pouring, thereby speeding up the smelting rhythm of the all-scrap electric arc furnace

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