Device and method for improving jet flow impact effect by utilizing injecting powder in electric arc furnace steelmaking

Abstract

The invention belongs to the technical field of ferrous metallurgy and particularly relates to a method for supplying oxygen and injecting powder in electric arc furnace steelmaking, which can be used for solving the problems that the oxygen supply and jet attenuation speed is rapid in the current electric arc furnace steelmaking, the impact force is insufficient and the powder yield is low; the oxygen and powder particles are mixed into a gas-solid mixed phase to generate a high-speed mixed jet flow; the kinetic energy of powder particles is utilized to improve the impact force of the electric-arc furnace oxygen supply jet flow; stirring in the molten pool is strengthened; and the efficient transportation of the powder particles is realized. The powder flow range is 5-60kg / min, the oxygen flow is 500-3500Nm3 / h, gas-solid mixed phase flow is 500-4000Nm3 / h, the gas-solid ratio is 0.5-5kg / kg; and the high-speed mixed jet flow velocity is 50-700m / s. The method is suitable for 5-300t of electric-arc furnace steelmaking of wall furnace oxygen supply and powder injection; the stirring strength in the electric-arc furnace molten pool is strengthened by over 20%; the utilization rate of the oxygen and power is improved; the oxygen consumption is lowered to be larger than 15%; and the blowing powder consumption is lowered to be larger than 30%.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for improving the impact effect of jets by injecting powder in electric arc furnace steelmaking suitable for 5-300t electric arc furnace steelmaking with oxygen supply and injection powder. Background technique [0002] At present, the furnace wall oxygen supply and powder injection for 5-300t electric arc furnace steelmaking are the most important operation methods, which are completed by furnace wall oxygen lance and furnace wall powder injection gun respectively. The following problems exist in the actual use process: the oxygen jet decays quickly in the furnace gas, the effective jet length is short, and the impact force on the electric arc furnace molten pool is insufficient; when the powder is injected, the movement speed of the powder particles is low, and it is easily disturbed by the air flow in the furnace , it is difficult to ente...

AI Technical Summary

Problems solved by technology

The following problems exist in the actual use process: the oxygen jet decays quickly in the furnace gas, the effective jet length is short, and the impact force on the electric arc furnace molten pool is insufficient; when the powder is injected, the movement speed of the powder particles is low, and it is easily disturbed by the air flow in the furnace , it is difficult to enter the molten pool to participate in the reaction, the powder yield is low; the operation and maintenance costs of the injection system are high

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