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Electric arc furnace steelmaking oxygen supply process, and electric arc furnace steelmaking method by using oxygen supply process

An electric furnace steelmaking and oxygen supply technology, which is applied in the field of iron and steel metallurgy, can solve the problems of low oxygen lance life and achieve the effects of reduced maintenance time, low oxygen consumption and high utilization rate

Inactive Publication Date: 2013-05-08
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no description of the specific oxygen supply process parameters, and the life of the oxygen lance is also low

Method used

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  • Electric arc furnace steelmaking oxygen supply process, and electric arc furnace steelmaking method by using oxygen supply process
  • Electric arc furnace steelmaking oxygen supply process, and electric arc furnace steelmaking method by using oxygen supply process
  • Electric arc furnace steelmaking oxygen supply process, and electric arc furnace steelmaking method by using oxygen supply process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A 70-ton high-impedance ultra-high-power electric arc furnace in a factory adopts the invention for steelmaking production. There are 3 cluster oxygen lances on the furnace wall of the electric arc furnace. In this embodiment, the combustible gas is natural gas.

[0064] The charging process is carried out twice, with a total charge of 86.30 tons, including 60.40 tons of scrap steel and 25.90 tons of pig iron. In the present embodiment, do not blend into molten iron. The first pot of charge is loaded into the furnace, wherein 38.70 tons of scrap steel and 13.10 tons of pig iron are used. The weight of the first pot of charge accounts for about 60% of the total charge. Among them, heavy steel scrap accounts for 7% of the total charge, and the heavy steel scrap is arranged in the middle and lower part of the electric furnace and above the small steel scrap, and avoids and stays away from the cluster oxygen lance nozzle.

[0065] The first pot of charge is then melted a...

Embodiment 2

[0071] A 70-ton high-impedance ultra-high-power electric arc furnace in a factory adopts the invention for steelmaking production. There are 3 cluster oxygen lances on the furnace wall of the electric arc furnace. In this embodiment, the combustible gas is natural gas.

[0072] The charging process is carried out twice, and the total furnace charge is 85.72 tons, including 57.61 tons of scrap steel and 28.11 tons of pig iron. In the present embodiment, do not blend into molten iron. Load the first pot of charge into the furnace, including 40.81 tons of steel scrap and 14.91 tons of pig iron. The weight of the first pot of charge accounts for about 65% of the total charge. Among them, heavy steel scrap accounts for 9% of the total distribution, and the heavy steel scrap is arranged in the middle and lower part of the electric furnace and above the small steel scrap, and avoids and stays away from the cluster oxygen lance nozzle.

[0073] The first pot of charge is then melte...

Embodiment 3

[0079] This embodiment is basically the same as Embodiment 1, the difference is that in this embodiment a 70-ton high-impedance ultra-high-power electric arc furnace is used for steelmaking production. Add about 33% molten iron that accounts for the weight of the total furnace charge in the furnace. After mixing the molten iron, the Raoul nozzle injects oxygen, and oxygen and combustible gas are injected from the oxygen burner to form a protective airflow.

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PUM

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Abstract

The present invention provides an electric arc furnace steelmaking oxygen supply process, and a steelmaking method thereof. The electric arc furnace steelmaking oxygen supply process comprises the following steps that: in a stage of furnace material melting, oxygen and flammable gas form flame to cut and assistantly melt the furnace materials, wherein the oxygen and the flammable gas are injectedthrough oxygen-fuel burning nozzles, the flows of the oxygen and the flammable gas are controlled to a gradual increase manner, the flow of the flammable gas in each oxygen-fuel burning nozzle is controlled in a range of 150-300 m<3> / h, the volume ratio of the oxygen to the flammable gas in the oxygen-fuel burning nozzle is 1.9-2.1; until the temperature of all the furnace materials is 600-800 DEG C, oxygen is injected through a laval nozzle, meanwhile, the oxygen and the flammable gas injected through the oxygen-fuel burning nozzles form the protective gas flow; until the temperature of the molten steel is 1620-1660 DEG C, the oxygen supply is completed. With the method provided by the present invention, the service life of the oxygen lance can be improved, the utilization rate of oxygencan be increased, and the electric arc furnace steelmaking cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and more specifically, relates to an electric furnace oxygen supply process and an electric furnace smelting method using the oxygen supply process. Background technique [0002] With the intensification of competition in the metallurgical industry at home and abroad, it has become an increasingly urgent issue to improve the competitiveness of the short-process process of electric furnaces (electric furnaces are commonly referred to as electric arc furnaces). Shorter smelting time, lower consumption and lower cost. [0003] The high-efficiency and intensified smelting of ultra-high-power electric arc furnaces largely depends on the efficient use of oxygen. use oxygen efficiently. A cluster oxygen lance usually includes three layers of gas channels that are independent of each other, namely, a Raoult nozzle (also called an oxygen lance) located in the center of the cluster oxyg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
CPCY02P10/216Y02P10/20
Inventor 苏雄杰王海兵李勇黄国玖张珉王鑫
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM