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针对宝钢超低硫钢精炼过程中钢水温度波动较大的问题,在考察超低硫钢转炉→LF精炼→RH精炼→喂线→连铸全流程钢水温度的变化情况的基础上,利用MATLAB软件建立了出钢至连铸过程钢水温度预测模型,采用该模型对钢水温度进行了预报,平均误差在±8℃以内的占87.5%。计算结果表明:空包修理时间在1 h以内,进行10 min左右的快烘,出钢温度不低于1 650℃,传运时间不超过25 min,可使LF的进站钢水温度在1 580℃左右。LF供电前期钢水升温速度达到2.0℃/min,供电后期3.0~3.5℃/min,同时RH真空室内衬温度在1 250~1 300℃,减少RH过程温降,可保证LF精炼在连铸浇铸的时间内,完成较重的脱硫任务,使LF精炼处理与连铸相匹配。
Aiming at the large temperature fluctuation of molten steel in the ultra-low sulfur steel refining process of Baosteel, based on the investigation of the change of molten steel temperature in the whole process of ultra-low sulfur steel converter → LF refining → RH refining → feeding line → continuous casting, The software established the temperature prediction model of molten steel from tapping to continuous casting. The temperature of molten steel was predicted by this model. The average error was 87.5% within ± 8 ℃. The calculation results show that the time of empty bag repair is less than 1 h, fast bake is carried out for about 10 min, the tapping temperature is not less than 1 650 ℃, the conveying time is less than 25 min, ℃ or so. The feed rate of molten steel in pre-LF power supply reaches 2.0 ℃ / min and 3.0 ~ 3.5 ℃ / min in the latter part of power supply, meanwhile, the temperature of liner in RH vacuum chamber ranges from 1 250 ~ 1 300 ℃, reducing the temperature drop of RH process can ensure LF refining in continuous casting Of the time, to complete the heavier desulfurization tasks, so LF refining process and continuous casting match.