A Mathematical Model of Blast Furnace with Radial Distribution of Gas Flow, Heat Transfer and Reactions Considered

Abstract

Considering the radial distribution of state variables in the blast furnace, a new mathematical model of the blast furnace was developed. This model consists of heat and mass balance equations under the existence of three phases (gas, solid, and liquid) and the equation of motion for gas. Assuming stream-lines of solid and liquid, the characteristic method was employed to solve these equations simultaneously.By the use of the mathematical model, the following results were obtained.(1) The calculated isothermal line (1400°C) is similar to that of quenched blast furnace.(2) The distributions of temperature, composition, and mass velocity in the upper part of the shaft are strongly affected by the O/C distribution.(3) In the lower part of the blast furnace, the dead zone which plays as a heat reservoir has the significant influence on the formation of the inverted V-shaped cohesive zone.