唐钢新区高炉-转炉区段物质流温度解析

Temperature analysis of material flow in BF-BOF section of Tangsteel New Area

为了研究影响唐钢新区高炉-转炉区段铁水温降及其波动性的原因,对唐钢新区高炉-转炉区段铁水罐运行过程进行解析,并统计分析了高炉出铁过程中和炼钢厂KR进站的铁水温度分布规律。通过对唐钢高炉-转炉区段铁水沟内和铁水罐内的铁水温度以及铁水罐空罐内衬温度进行现场实际测温,研究其温降过程及温降原因,为唐钢新区高炉-转炉区段铁水温降优化提供具体的理论指导。结果表明,铁水沟内的铁水温度在生产过程中的变化具有周期性,堵口后沟内残铁温度以0.8~0.9℃/min的速率降低,开口后在60 min内逐渐回升并稳定在1520℃左右。高炉出铁过程中的铁水温降占高炉-转炉区段铁水总温降的主要部分,尾罐对高炉-转炉区段铁水温降具有重要影响,尾罐和非尾罐的平均铁水温度相差49℃。兑铁结束后的铁水罐空罐在前20 min温降幅度较大,罐龄后期的铁水罐内衬蓄热能力较罐龄前期略差,且内衬的上中下部因铁水侵蚀变得不均匀,相同空罐时间,罐龄后期铁水罐内衬温降幅度更大。唐钢新区应采用减小高炉出铁量波动、优化炉下配罐模式、尾罐及时转场处理、加强铁水罐保温、设置在线铁水罐清渣位等措施,减少高炉-转炉区段铁水温降及其波动。

In order to study the reasons affecting the temperature drop and volatility of the hot metal in the BF-BOF section of Tangsteel New Area,the operation process of the hot metal ladles and the temperature distribution pattern of BF and KR station was analyzed.The temperature measurement of the hot metal in runners/ladles and the empty HML wall was carried out,so as to provide specific theoretical guidance for the optimization of the temperature drop of the hot metal in the BF-BOF section of Tangsteel New Area.The results show that the temperature of the hot metal in runners had a periodic fluctuation.It decreased at a temperature drop rate of 0.8-0.9℃/min during tapping hole blocked,and gradually increased within 60 min during the opening process and finally stabilized at about 1520℃.The temperature drop of hot metal during the blast furnace tapping process accounts for the main part of the total temperature drop at the BF-BOF section.The ending ladles caused a larger temperature drop in the full ladles after the end of BF tapping,and the average temperature difference between ending ladles and normal ladles was 49℃.The temperature drop in the first 20 min of the empty HML was greater.The heat storage capacity of the HML lining in the late age was slightly worse than that in the early age,and the upper,middle and lower lining became uneven.With the same time,the temperature drop of the former was greater.It is recommended to reduce the fluctuation of blast furnace tapping,optimize the distribution mode under the furnace,timely transfer the ending ladles,strengthen the insulation of the hot metal ladles,and set the online slag cleaning position of the hot metal ladles to reduce the temperature drop and fluctuation of the hot metal in BF-BOF section.