【作者】 雷鸣； 杜屏； 魏红超； 焦克新； 张建良；

【Author】 LEI Ming;DU Ping;WEI Hongchao;JIAO Kexin;ZHANG Jianliang;Jiangsu Shagang Group Co., Ltd.;School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing;

【机构】 江苏沙钢集团有限公司； 北京科技大学冶金与生态工程学院；

【摘要】 沙钢2680高炉炉役中后期炉缸温度相继升高,采用传统的钛矿护炉方法,铁水中的钛含量最高达到了0.12%以上,护炉成本达到了10元/吨铁,但炉缸安全状态并未得到有效改善,仍需采用休风、堵风口等措施来保证安全生产。除安全方面的问题,高钛铁水还影响下游炼钢工序,不但造成转炉冶炼过程中喷溅,还影响品种钢的生产。高炉安全长寿自修复技术明确了炉缸铁水达到碳饱和,与耐材热面温度低于保护层形成温度是富石墨碳保护层形成的两个必要条件,可以通过优化炉缸传热体系促进铁水析碳和调控炉缸活性促进铁水渗碳两个必要措施形成保护层,实现炉缸自修复。沙钢2680 m~3高炉通过提高铁水温度、提高铁水碳含量、活跃炉缸等措施,炉缸温度逐步下降并保持稳定,高炉安全停炉大修。在大修破损调查中发现,炉缸形成了富石墨碳为主的多元综合保护层,厚度普遍在30cm以上,在炉役后期起到了至关重要的保护作用。更多还原

【Abstract】 Hearth temperature of Shasteel 2680m~3 blast furnace was increased in the middle and later stages of service.Titanium ore was used as a Traditional maintenance technology. The titanium content in hot metal reached more than 0.12%,and the cost of furnace maintenance reached 10 yuan/ton of iron. But the safety state of the furnace hearth has not been effectively improved, still need to blow-off, tuyere blocking and other measures to ensure safe production. In addition to safety problems, high titanium molten iron also affects the downstream steelmaking process, not only causing spatter in the converter smelting process, but also affecting the production of grade steel. Safety and longevity self-repairing technology of blast furnace specifies that the carbon saturation of the molten iron in the furnace hearth and the formation temperature of the hot surface of the resistant material is lower than that of the protective layer are two necessary conditions for the formation of the graphite rich carbon protective layer. The protective layer can be formed by optimizing the heat transfer system of the furnace hearth to promote the carbon precipitation of molten iron and regulating the activity of the furnace hearth to promote the carburizing of molten iron, so as to realize the self-repair of the furnace hearth. By increasing the hot metal temperature, increasing the carbon content of hot metal and activating the furnace hearth, the furnace hearth temperature gradually decreased and remained stable, and the blast furnace was safely blown down for relining. In the investigation of hearth damage, it was found that the furnace hearth formed a multicomponent comprehensive protective layer mainly rich in graphitic carbon, the thickness of which was generally more than 30cm, which played a crucial protective role in the later stage of service.更多还原