A kind of injection process that can improve the secondary combustion efficiency of rh refining furnace

Abstract

The invention relates to a blowing process capable of improving the secondary combustion efficiency of an RH refining furnace, and belongs to the technical field of steelmaking. According to the blowing process, a top-blowing secondary combustion oxygen lance blowing process is adopted in the RH refining furnace, so that CO gas generated by a carbon oxygen reaction is in more contact with oxygen,the secondary combustion area is expanded, and therefore the secondary combustion rate can be further improved. The blowing process is mainly characterized in that for steel types needing RH deep decarbonization treatment, when tapping [ C ] of a converter blowing end point is larger than or equal to 0.05%, top-blowing oxygen forced decarbonization operation is carried out, the top-blowing intensity is 0.13-0.17 Nm<3> / min.t, and the oxygen blowing and decarbonization time is 4-6 minutes, the pressure of a vacuum chamber is gradually reduced from 101 kPa to 0.067kPa, treatment is carried out for 18minutes, and then the content of [ C ] can be controlled to be below 0.0012%. By adopting the blowing process, the secondary combustion rate can be improved by 20-30%., and the temperature of molten steel is further compensated by about 4-6 DEG C compared with a traditional top lance oxygen blowing decarbonization process.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to an injection process capable of improving the secondary combustion efficiency of an RH refining furnace, which is used to promote the CO secondary combustion and vacuum decarburization process of the RH refining furnace. Background technique [0002] The application of secondary combustion technology in steelmaking is reflected in the use of converter oxygen lance (converter secondary combustion oxygen lance) and RH top blowing lance (represented by RH-KTB), as well as in electric arc furnace steelmaking (two Secondary combustion PC gun), indicating that the secondary combustion technology has been applied to a certain extent in the molten steel blowing and refining stage, but in the refining stage has not yet formed a special secondary combustion oxygen lance injection process technology like a converter or an electric furnace, currently refining The top-blown ox...

AI Technical Summary

Problems solved by technology

[0002] The application of secondary combustion technology in steelmaking is reflected in the use of converter oxygen lance (converter secondary combustion oxygen lance) and RH top blowing lance (represented by RH-KTB), and also in electric arc furnace steelmaking (two Secondary combustion PC gun), indicating that secondary combustion technology has been applied in molten steel blowing and refining stages, but in the refining stage has not yet formed a special secondary combustion oxygen lance injection process technology like converters or electric furnaces, currently refining The top-blown oxygen lance in the stage is mainly used for forced decarburization

However, this technology has not fully utilized the CO combustion in the vacuum chamber. For this reason, the present invention has developed special secondary combustion equipment and technology for the RH refining furnace, which can make the secondary combustion rate in the RH refining furnace by The current 40-60% is further improved, making full use of the residual heat in the furnace to heat the molten steel, bringing new technology to the smelting of molten steel in the RH refining furnace

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