Abstract
An approximate analysis relevant to the gas flow through the shaft of blast furnace with layered burdens is developed for predicting the local azimuth of streamline, the ratio of gas-distribution between two adjacent layers, and the radial distribution of gas flow rate across each layer.
The effects of charging conditions on the non-uniformities of gas flow in layered burdens are investigated on the basis of a mathematical model derived from the analysis mentioned above. The predictions obtained by the model are shown to be in reasonable agreement with the numerical solutions by the finite difference method of the equation of continuity and the vectorial Ergun equation. Computational time for the approximate model can be considerably abridged in comparison with that for the rigorous numerical method.
The zigzag patterns of gas-streamlines were visualized in a two-dimensional packed bed composed of alternate layers of silicagel particles. Availability of the present model was verified from the close agree ment between observed and predicted streamlines.
