A heating electrode process and device for spraying powder in electric arc furnace

A technology for heating electrodes and electric arc furnaces, applied in the field of electric arc furnace smelting, to achieve the effects of shortening the operation cycle of a single furnace, saving power consumption, and reducing production costs

Active Publication Date: 2022-05-27
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide a heating electrode process for electric arc furnace sprayable powder, to overcome the defects of the existing electric arc furnace smelting process, so that the powder spray can be quickly and evenly mixed with the liquid phase melt in the molten pool Mixing, improving metallurgical kinetic conditions, using nitrogen and electric arc furnace exhaust gas mixture as protective gas, reducing graphite electrode oxidation, and saving reducing agent usage

Method used

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  • A heating electrode process and device for spraying powder in electric arc furnace
  • A heating electrode process and device for spraying powder in electric arc furnace
  • A heating electrode process and device for spraying powder in electric arc furnace

Examples

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Embodiment 1

[0059] like figure 1 As shown, a double top electrode DC electric arc furnace can spray powder heating electrode process and device, which is used for smelting reduction and smelting of metallurgical waste slag. like image 3 and 4 As shown, the graphite electrode 2 is a hollow electrode, and a powder spray gun 3 is inserted in the middle. The powder spray gun 3 is divided into two layers: inner and outer layers, wherein the inner layer is the central channel 3-1, which is used for injecting the reducing agent pulverized coal, and the outer layer is the annular channel 3 -2, it is used to blow protective gas nitrogen and assist in blowing the reducing agent pulverized coal. The double-electrode discharge heats the metallurgical waste slag in the electric arc furnace. The high-temperature electric arc melts the solid metallurgical waste slag and forms a molten pool. The arc forms a strong stirring force. The injected reducing agent pulverized coal is dispersed into the entire...

Embodiment 2

[0063] like figure 2 As shown, a double top electrode ladle refining furnace can spray a heating electrode process and a device for tempering agent, which is used for the refining of molten steel. like image 3 and 4 As shown, the graphite electrode 2 is a hollow electrode, and a powder spray gun 3 is inserted in the middle. The powder spray gun 3 is divided into two layers: inner and outer layers, wherein the inner layer is the central channel 3-1, which is used for spraying the conditioning agent quicklime, and the outer layer is the annular channel 3 -2, It is used for spraying protective gas nitrogen and assisting in blowing the conditioning agent quicklime. The double electrode discharge heats the molten steel in the ladle refining furnace, and the high-temperature electric arc forms a strong stirring force. The quicklime is sprayed into the entire molten pool with the arc stirring, and the high-temperature chemical reaction with the molten steel is completed, and the ...

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Abstract

The invention discloses a heating electrode process and device for electric arc furnace sprayable powder, including electrode injection integration process and tail gas recycling and nitrogen compound injection process; Open the hole, and insert the powder spray gun composed of the inner central channel and the outer annular channel into the electrode central hole until it is flush with the front end of the electrode, so that the powder coming out of the inner central channel and the protective gas coming out of the outer annular channel Together, they form coaxial power and go deep into the melting pool; the tail gas reuse and nitrogen composite injection process is to send the tail gas generated in the smelting process to the air compressor station for storage by the induced draft fan after being dedusted by the bag filter, and the stored tail gas is adjusted with nitrogen The nitrogen gas in the pressure station is sent to the gas mixing and pressure regulating station for storage in a certain proportion, so that the mixed gas is used for powder feeding in the injection tank, powder injection of powder spray gun and protective gas blowing. The invention can quickly and uniformly mix the powder and the liquid phase melt, reduce electrode oxidation, and save the amount of reducing agent used.

Description

technical field [0001] The invention relates to the technical field of electric arc furnace smelting, in particular to a heating electrode process and a device for spraying powder in an electric arc furnace. Background technique [0002] As the mainstream heating and smelting equipment for steel and alloy smelting, ore smelting and metallurgical waste secondary disposal, electric arc furnaces exist in various furnace types, such as smelting reduction smelting furnaces, submerged arc furnaces, and ladle refining furnaces. In terms of power supply form, there are AC electric arc furnaces and DC electric arc furnaces. DC electric arc furnaces include single top electrode bottom electrode DC electric arc furnaces and multi-top electrode electric arc furnaces. [0003] The above-mentioned electric arc furnace smelting process generally needs to add fuel, reducing agent or tempering agent. In the existing injection adding technology, the insertion position of the spray gun is sepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27B3/08F27B3/18F27B3/20F27B3/22F27D17/00C21C5/52
CPCF27B3/085F27B3/18F27B3/20F27B3/22F27D17/008C21C5/52Y02P10/20
Inventor 王秀龙张明飞胡芝娟
Owner TIANJIN CEMENT IND DESIGN & RES INST
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