宁钢1号高炉热风炉大修设计特点及生产实践

宁钢1号高炉配置3座内燃式热风炉，自2009年以来进行了一系列修复工作，2012年起3号热风炉出现隔墙鼓包等现象，送风温度只能勉强维持在1 050 ℃。针对1高炉内燃式热风炉的种种问题，利用现有场地设计1座顶燃式热风炉，形成3座内燃式及1座顶燃式热风炉组，投运后最高送风风温提高80 ℃，燃料比降低20 kg/t，保证了1号高炉安全、稳定、经济地生产，也为单座热风炉故障处理或检修提供了保障。

Design features and practice operation of hot stove revamping for No.1 blast furnace in Ningsteel

The No.1 blast furnace in Ningsteel was equipped with three internal combustion hot stoves, and a series of revamping work had been carried out since 2009. However, the partition wall bubbles appeared in No.3 hot stove since 2012 and the blast temperature of blast furnace could only be 1 050 ℃. According to the problems of the hot stoves for the No.1 blast furnace, a new top- combustion hot stove was built and composed a new hot stove group in which there were 3 internal- combustion hot stoves and 1 top- combustion hot stove. The operation results showed that the maximum blast temperature increased by 80 ℃ and the fuel ratio reduced by 20 kg/t, which ensured the safety, stability and economic production of No.1 blast furnace and provided the guarantee for fault handling or overhaul of a single hot stove as well.