Research on deadman state during tapping process

In this paper, a deadman state model is established. According to the actual operation parameters of 5500 m3 blast furnace (BF) in Shougang Jingtang United Iron and Steel, the influence of taphole depth, deficient iron amount and salamander depth on deadman state is discussed. Meanwhile, the relationship between deadman state and differential pressure of BF is analysed. The results show that deadman of 5500 m3 BF is floating during regular production and the range of floating height is 0.23–0.30 m. When the mud mushroom cannot be formed or cracks during tapping process, the range of floating height is 0.38–0.45 m. The upward movement of deadman can result in the reduction of coke size and porosity, which is one of the key factors that causes holding hot blast.