Design and Operation Control for Long Campaign Life of Blast Furnaces

Abstract

At the beginning of 1990s, Shougang blast furnaces (BFs) No. 2, No. 4, No. 3 and No 1 were rebuilt sequently for new technological modernization in succession. The campaign life of BFs No. 1, No 1. and No. 4 reaches 16. 4, 17. 6 and 15. 6 years, respectively, and the hot metal output of one campaign reaches 33.8. 35. 48 and 26. 37 Mt, respectively; the hot metal output of BF effective volume of one campaign reaches 13328, 13991 and 12560 t/m³, respectively, which reaches the international advanced level of BF high efficiency and long campaign life. In BF designing, several advanced BF long campaign technologies were adopted. BF proper inner profile was optimized, reasonable inner profile was adopted, and closed circulating soften water coolling technology was applied in 4 BFs. Double row coolling pipe high efficiency coolling stave was developed which could prolong the service life of bosh, belly and stack. Hot pressed carbon brick and ceramic cup hearth lining structure were applied and optimized. BF operation was improved continuously to ensure stable and smooth operation of BF. Hearth working condition control was strengthened, burden distribution control technology was applied to achieve reasonable distribution of gas flow, and heat load monitoring was strengthened to maintain BF reasonable working inner profile. Proper maintenance at the end of BF campaign was enhanced. Hearth and bottom service life was prolonged by adding titaniferous material and enhancing hearth cooling.Gunning of lining was carried out periodically for the area above tuyere zone.