抄録
This paper deals with two-dimensional gas flow in the blast furnace which has complicated structure of the bed by the application of the finite element method. Besides this, simultaneous analysis on the gas flow and heat transfer is also carried out for the simplified conditions in which solid flow is approximated reasonably to potential flow.
As for the gas flow, multi-dimensional Ergun's equation is solved together with the equation of continuity by using the variational principle. However, heat balance equations for gas and solid are solved on the basis of the Galerkin method. In order to consider the layered structure and also the properties of cohesive and raceway zones in the blast furnace, the finite elements for the numerical computation are corresponded to the ore and coke layers.
Computed results indicate that the drastic changes in gas flow occur arround the cohesive and raceway zones which have extremely different properties on gas flow. Zig-zag flow of gas appears in the lumpy region which is caused by the different permeability of are and coke layers and also by the inclination of the layers. Computed results for the simultaneous analysis on gas flow and heat transfer give correctly the principal characteristics of heat exchange, which proves the mathematical formulation and the numerical technique to be sound.
