关键词: 高炉, 滞留量, 气液两相流, 数学模型

Abstract: Holdup characteristics of liquid in a packed bed were experimentally examined for clarifying the holdup of molten materials in the lower coke zone of a blast furnace. The viscosity, density and surface tension of the liquid, size and shape of particles and liquid velocity were varied in the experiments. The results show that: increasing viscosity, surface tension and reducing density of liquid cause static liquid holdup hs to increase. These factors in order of degree of influence are density, surface tension and viscosity of liquid, and reducing size, shape factor and porosity of packing causes hs to increase. The bigger the static liquid holdup hs, the bigger the total liquid holdup ht when ul increases in all the combinations of liquids and packings, so those factors affecting hs are also the main factors affecting dynamic liquid holdup hd. Correlations for hs, hd without gas flow and for ht in countercurrent gas-liquid two-phase flow were obtained. hs is the determinant of the holdup of molten materials in the absence of gas flow, and the most important factor affecting hs is the size of coke in a blast furnace.

Key words: blast furnace, holdup, gas-liquid two-phase flow, mathematical model