Abstract
The characteristics of burden flow in blast furnace is discussed based on both theoretical analyses and observations in two types of cold model experiments with gas blowing. Sublimation of dry ice particles is utilized in the experiments to simulate coke combustion before tuyeres or the volume reduction of cohesive layers in blast furnace. Experimentally observed profile of deadman, which is formed just behind the raceway, is shown to be in good agreement with a slip line calculated for the passive stress state. Theoretical height of the deadman is increased by decreased angle of internal friction and increased angle of wall friction. The burden flow in the shaft is approximately described by a potential flow theory taking account of the volume change of burden. Below the lower end of the shaft, however, the viscous flow analysis gives more realistic flow field presumably due to the prevailing passive stress state.
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