摘要
系统性分析了钢铁厂烟气中CO_(2)捕集利用特点。在首钢京唐开发了炼钢厂废气中二氧化碳的资源化利用技术,将石灰窑尾气中捕集的CO_(2)应用于转炉顶底复吹工艺中发挥冶金作用。通过PSA变压吸附法和液化提纯法,将石灰窑尾气中CO_(2)体积分数由23.5%提高至99.8%。通过转炉顶底复吹CO_(2)系列试验,研究了CO_(2)对转炉终点碳氧积、炉渣TFe含量、氮含量、热量及炉底侵蚀的影响。转炉顶吹CO_(2)和O_(2)混合气体时,CO_(2)体积分数为8.1%时,碳氧积、炉渣TFe和脱磷率达到最好结果。转炉底吹CO_(2)时,转炉终点氮含量随着CO_(2)喷吹时间的延长而降低。转炉底吹CO_(2)需与氩气进行切换,冶炼末期底吹CO_(2)导致CO分压升高,底吹CO_(2)时间控制在12 min以内可以避免碳氧积和炉渣TFe含量升高。吨钢喷吹1 m^(3) CO_(2)引起熔池平均温降6.4~8.3℃,热量由钢液转移至转炉煤气CO中。为了利用底吹CO_(2)的冷却效应保护底吹枪,提高CO_(2)和钢液碳的反应率,CO_(2)应在高速脱碳期吹入;同时,为了避免CO_(2)的弱氧化性侵蚀耐火材料,吹炼末期低碳范围避免喷吹CO_(2),末期CO_(2)和钢液反应产生的金属氧化物导致耐火材料侵蚀更快。
The characteristics of CO_(2) capture and utilization of exhaust gas in iron and steel plants was analyzed systematically.The carbon dioxide utilization technology of exhaust gas was developed in Shougang Jingtang,and the CO_(2) captured from the tail gas of lime kiln played a metallurgical role in the combined blowing converter process.The CO_(2) concentration of the exhaust gas from the lime kiln increased from 23.5%to 99.8%using the comprehensive method of the pressure swing adsorption and cryogenic separation.Through a series of trials of bottom blowing and top blowing CO_(2) in converter,the effect of CO_(2) blowing parameters on the w([C])×w([O]),w((TFe))of the slag,w([N]),the heat change and converter tuyere erosion were researched.The best results for the value of w([C])×w([O]),slag w((TFe))and dephosphorization were achieved when the CO_(2) and O_(2) mixture was blown at a CO_(2) mixing ratio of 8.1%.The[N]content decreased with the extension of CO_(2) blowing time.The CO_(2) bottom blowing into the converter should be switched with Ar,and the blowing time of CO_(2) should be controlled in the early 12 min to avoid increasing the w([C])×w([O])value and the w((TFe))in the slag.The temperature drop is estimated to be 6.4-8.3℃/(m^(3)·t).The physical heat of molten steel is converted into chemical heat and stored in the BOF gas CO.In order to utilize the cooling effect of bottom blowing CO_(2) to protect the bottom blowing tuyere and improve the reaction rate of CO_(2) and[C],CO_(2) should be blown in the high-speed decarburization period.In order to avoid the erosion of refractory,CO_(2) should be avoided at the final stage,for the metal oxides produced by the reaction between the CO_(2) and the molten steel result in a faster erosion of the refractory.
作者
董文亮
袁天祥
李海波
赵长亮
丁国慧
邓小旋
刘延强
朱荣
DONG Wenliang;YUAN Tianxiang;LI Haibo;ZHAO Changliang;DING Guohui;DENG Xiaoxuan;LIU Yanqiang;ZHU Rong(Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China;Beijing key Laboratory of Green Recyclable Process for Iron and Steel Production Technology,Beijing 100043,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Manufacturing Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,Hebei,China;Steelmaking Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,Hebei,China)
出处
《钢铁》
CAS
CSCD
北大核心
2024年第9期236-248,共13页
Iron and Steel
关键词
钢铁行业碳捕集
PSA变压吸附法
二氧化碳资源化
转炉喷吹CO_(2)
顶底复吹
carbon capture in the steel industry
pressure swing adsorption
carbon dioxide utilization
CO_(2)blowing in converter
top and bottom blowing
