Experimental research of gas permeability within cohesion area
DOI:
https://doi.org/10.31498/2225-6733.28.2014.33534Keywords:
area of cohesion, blast furnace, gas dynamics, physical model, pressure, gas velocityAbstract
Permeability of charge material in a blast furnace is a limiting factor in furnace capacity. The greatest resistance to the passage of gases in the blast furnace has a cohesive area. Cohesive zone is formed as a result of the softening of iron ore component under the influence of high temperatures. Effect of cohesive zone on gas dynamics of the blast furnace depends on the configuration of the plastic zone. In this work to study the dependence of the pressure drop of gas in the area of cohesion produced a series of experiments. Change in the pressure drop of gas in the area of cohesion has been studied depending on the configuration of the zone. Factors responsible for the configuration of the plastic zone selected height of coke windows, thickness of cohesion zone, height of the root of cohesion zone in peripheral, intermediate and central zones. To conduct the study was to construct a model of a blast furnace useful volume of 2002 m3 in a scale of 1:15. To comply with the nature of the gas flow in a real blast furnace and the model was applied the principle of self-similarity. By result obtained equation for determining the gas pressure in cohesive zone depending on its configuration. The coefficients of the equation tested for significance by Student's t test. The adequacy of the whole equation is confirmed Fisher criterion. The resulting equation allows to predict the change in the pressure drop of gas in the blast furnace when change the parameters of its work are responsible for the shape of the plastic zone. The studies determined that the thickness of the cohesive zone has the greatest influence on the permeability. Increasing the thickness decreases permeability
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