High efficiency and long campaignship blast furnace for the 21st century

Iron output and ironmaking technology have been increased quickly and developed rapidly in China since 1978. The main technologies are of pulverized coal injection, and extending blast furnace life. In our consideration, the key points of blast furnace technologies in China for the 21st century are: (1) long campaign life blast furnace, i.e., blast furnace campaign life can be more than 15 years. The life of coolers determines blast furnace campaign life, and the blast furnace coolers of new design, through heat transfer calculating, can stand for more than 15 years. (2) High efficiency blast furnace; this implies (1) making conventional blast furnaces with high efficiency, i.e., the cost of iron can be lowered by 10-15% in the near future, the average productivity reaching more than 2.0 t/m 3 d. The coal injection rate will reach 150-200 kg/t and blast furnace campaign life will be prolonged to 15 years or so; blast furnace modern control and maintenance technologies are adopted. (2) The technique of the full oxygen blast furnace will be developed further and applied.