高炉钛矿护炉存在问题及讨论  

Problems and discussion on blast furnace protection with titanium-bearing material

作　　者：牛群 邹忠平[1] 赵运建[1] 王刚[1] NIU Qun;ZOU Zhongping;ZHAO Yunjian;WANG Gang(MCC Low-Carbon Technology Research Institute Chongqing of CISDI Engineering Co.,Ltd.,Chongqing 401122,China)

机构地区：[1]中冶赛迪工程技术股份有限公司中国中冶低碳技术研究院(重庆),重庆401122

出　　处：《钢铁研究学报》2023年第7期851-860,共10页Journal of Iron and Steel Research

基　　金：重庆市自然科学基金资助项目(CSTB2022NSCQ-BHX0050)。

摘　　要：高炉配加含钛炉料是保护炉缸的措施之一,其护炉机制尚不明确,使用效果差异较大,长期使用还会给高炉操作带来一些不利影响。为此,对钛矿护炉机制和护炉失败原因进行了讨论,并通过热力学计算的方法,系统研究了钛矿护炉时高炉渣TiO_(2)含量、铁水TiC析出温度及钛含量的合理控制范围,从而指导生产实践,为高炉操作者选取钛矿护炉操作参数提供理论依据和参考。研究结果表明:钛矿护炉主要是通过降低铁水流速和促进炭砖复合保护层形成的双重作用来实现。消除炉缸侧壁气隙,保证传热体系的完整,可提高钛矿护炉效果。当前计算工况下,高炉渣中TiO_(2)质量分数、铁水TiC析出温度、铁水中钛质量分数分别控制在1.5%~3.0%、1 300~1 400℃、0.064%~0.11%范围内,能够有效护炉,减轻其带来的不利影响。Adding titanium containing burden to the blast furnace is one of the measures to protect the furnace hearth.The mechanism of protecting the furnace is not yet clear,and the effectiveness of use varies greatly.Titanium-bearing material use for a long time will also bring some adverse effects on the blast furnace operation.Therefore,the protection mechanism and the failure reason of titanium-bearing material were discussed.The reasonable range of TiO_(2) content in slag,TiC precipitation temperature in molten iron and the corresponding titanium content were systematically investigated by thermodynamic calculation method so as to guide the production practice and provide a theoretical basis for the operation parameters selection of titanium-bearing material protection for blast furnace operators.The results show that titanium-bearing material protection is mainly achieved by the dual action of reducing the flow rate of molten iron and promoting the formation of composite protective layer of carbon brick.To achieve better protective effect,it is necessary to eliminate the air gap of the hearth sidewall to ensure the integrity of the heat transfer system.Under the current calculation conditions,the TiO_(2) mass fraction in blast furnace slag,the TiC precipitation temperature in molten iron,and the titanium mass fraction in molten iron are controlled within the range of 1.5%-3.0%,1300-1400℃,and 0.064%-0.11%,respectively,which can effectively protect the furnace and reduce its adverse effects.

关 键 词：高炉 炉缸长寿 钛矿护炉 保护层 机制 

分 类 号：TF572[冶金工程—钢铁冶金]