摘要
AOD炉冶炼不锈钢工艺主要通过喷吹大量的O2和Ar实现脱碳保铬。钢铁行业每生产1t钢的CO2排放量约为1.57t,若能将排放的CO2捕集回收并用于钢铁生产过程中,不仅可以节能减排,还可降低冶炼成本。通过热力学计算验证了CO2代替Ar或O2喷吹冶炼不锈钢的可行性,同时分别对不同元素的氧化升降温、不同C含量及CO2喷吹量条件下的反应速率、脱碳深度、保铬效果进行计算,分析CO2代替O2脱碳保铬的热力学过程。结果表明在高碳区喷吹CO2-O2混合气体有利于AOD冶炼过程脱碳保铬。随着CO2比例的增加保铬效果随之提高,而脱碳速率随之降低。但是,提高CO2喷吹量时熔池内脱碳反应速率过慢,引起熔池温度偏低,CO2喷吹比例应控制在20%~40%(体积分数)之间。
Decarbonization and chromium conservation technology is mainly achieved by blowing O2 and Ar during the traditional AOD furnace smelting process.The CO2 emissions per ton of steel production in the steel industry are about 1.57t.If the CO2 emissions can be collected and recycled in the steel production process,it can not only save energy and reduce emissions,but also reduce the cost of smelting.The feasibility of using COg instead of Ar or O2 to be injected for smelting stainless steels was verified by thermodynamic calculations.The reaction limits of the different carbon content,the rising and falling temperature of elemental oxidation,the reaction rate under different ratios of CO2 injection,the depth of decarburization,and the result of chromium retention were also calculated.The thermodynamic mechanism of blowing CO2 to replace O2 decarburizing and protecting chromium was analyzed.The results show that blowing CO2-O2 mixed gas in high carbon zone is conducive to decarbonization and chromium conservation in the AOD smelting process.With the increase of COg ratio,the effect of chromium retention is enhanced whereas the decarburization rate is reduced.When the CO2 injection amount is increased,the decarburization reaction rate in the molten pool is too slow,causing the molten pool temperature to be low,and the CO2 injection ratio should be controlled between 20 vol.% and 40 vol.%.
作者
王容岳
袁章福
谢珊珊
李建民
南海
翟俊
WANG Rong-yue;YUAN Zhang-fu;XIE Shan-shan;LI Jian-min;NAN Hai;ZHAI Jun(Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;Technology Center,Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,Shanxi,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2018年第11期874-880,共7页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(U1560101)
关键词
CO2-O2混合喷吹
脱碳保铬
热力学
AOD炉
CO2-O2 mixed injection
decarbonization and chromium conservation
thermodynamics
AOD furnace
