Tetsu-to-Hagane Vol. 87 (2001) No. 5 Table 1. Physical properties of particles. (a) side view (b) front view Fig. 1. Experimental apparatus with semic

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Tetsu-to-Hagane Vol. 87 (2001) No. 5 Deadman.Renewal Motion in a Cold Model of Blast Furnace Hiroshi TAKAHASHI and Hideki KAWAI Synopsis : Permeability in coke bed in the lower part of blast furnace is believed to have important functions to affect the operation. Accordingly, elucidation of the renewal mechanism and packed structure of deadman coke is expected. The renewal motion may be related with such a motion that the coke bed floats due to the buoyancy force when the molten liquid is stored beyond a critical depth in the hearth. In the present study, a semi-three dimensional model of blast furnace with semicircular cross section was used. The model can approximate more adequately practical furnace in the stress field than two-dimensional model. The moving trajectory of individual particle of deadman packed bed was observed under the repetition of floating to sinking motion of the bed, using water and model particles in place of molten liquid, coke and ore, respectively. The following results were obtained. The height of particle-free space formed above thehearth when the bed floated, had a close correlation with the total depth of water within the bed. The particle renewal did not take place in the whole deadman region, but was restricted within a particular region determined depending on the free space height. The two renewal paths were recognized. First, the particles forced up due to buoyancy towards the deadman surface, joined with the fast moving particles in the funnel flow region to move into the raceway. Second, the particles which descended within the deadman, turned gradually to the direction to move towards the raceway. Key words : blast furnace; hearth; deadman renewal motion; cold model; semi-three dimensional model; bed floating and sinking; buoyancy.

Tetsu-to-Hagane Vol. 87 (2001) No. 5 Table 1. Physical properties of particles. (a) side view (b) front view Fig. 1. Experimental apparatus with semicircular cross section. Fig. 2. Particle supplying method.

Table 2. Experimental condition and results.

Tetsu-to-Hagane Vol. 87 (2001) No. 5 Fig. 3. Flow pattern of tracer particles during 1 st storage and drainage of water (Run 8). ( b ) Fig. 4. Trajectory of tracer particles with repetition of storage and drainage of water (Run 8).

Fig. 5. Particle moving path for deadman renewal.

Tetsu-to-Hagane Vol. 87 (2001) No. 5 Fig. 6. Trajectory of tracer particles with repetition of storage and drainage of water (Run 6). Fig. 8. Schematic diagram representing deadman renewal by repetition of floating to sinking motion of the lower part of packed bed. Table 3. Comparison of particle behavior between two dimensional and present models. Fig. 7. Relationship between Hf and Z-Zc. Hf: height of particle-free space formed on the hearth, Z: water level and Zc: critical water level for floating particle bed.

1 ) K.Takeda, T.Edo, Y.Sawa, H.Kokubu, S.Taguchi and H.Itaya: CAMP- ISIJ, 6 (1993), 868. 2 ) Y.Kimura, K.Shibata, M. Shimizu and H.Inaba: CAMP-ISIJ, 1 (1988), 1072. 4 ) H.Takahashi, M.Tanno and J.Katayama: ISIJ Int., 36 (1996), 1354. 5 ) M.Shimizu, Y.Kimura, S.Inaba, R.Hori, K.Kuwano and F.Noma: R & D Kobe Steel Eng. Rep., 4 (1991), 11. 7 ) K.Katayama, S.Wakabayashi, T.Inada, K.Takatani and H.Yamaoka: Tetsu-to-Hagane, 83 (1997), 91.

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