大型转炉双角度氧枪喷头高供氧强度炼钢

doi:10.13228/j.boyuan.issn0449-749x.20210048

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Abstract In order to increase the oxygen flow rate of the 300 t converter in Baosteel's steelmaking plant from 60 000 to 69 000 m³/h, a 6-hole dual-angle oxygen lance nozzle was designed. Based on the test results of the first dual-angle nozzle, combined with the measurement of the jet flow field of the oxygen lance nozzle in the laboratory, and the water model study of the effect of the jet and the molten bath, the nozzle design was improved. In order to formulate the correct oxygen supply system and nozzle design, the pipeline pressure loss of Baosteel No.1 Steelmaking Plant was measured. The main parameters of the optimized No.3 6-hole dual-angle nozzle are, oxygen outlet Mach number Ma≥2.1, the oxygen flow of the small-angle nozzle is larger than 57% of the total oxygen flow, and the angle of the large-angle nozzle is larger than 13°, the angle of the small-angle nozzle is about 10°. The effect of steelmaking with No.3 6-hole nozzle is, oxygen flow rate is 69 000 m³/h, oxygen blowing time is shortened by 2.0 min/ch on average, dephosphorization rate is 87.5% on average, and oxygen lance nozzle life is 190 times on average. Through this research work, we have mastered the design and manufacture of the dual-angle 6-hole nozzle for high oxygen intensity blowing (3.833 m³/(t·min)) and the blowing operation technology of the large converter.

Key words： converter steelmaking oxygen supply intensity oxygen flow oxygen lance nozzle metallurgical effect

Received: 25 January 2021

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	Articles by authors
	JIANG Xiao-fang
	YANG Wen-yuan
	WU Ya-ming
	WANG Ming-lin
	LI Hong-tao
	HU Yan-bin

Cite this article:

JIANG Xiao-fang,YANG Wen-yuan,WU Ya-ming等. High oxygen supply intensity steelmaking with dual-angle oxygen lance nozzle in large converter[J]. Iron and Steel, 2021, 56(9): 62-73.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210048 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I9/62

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