An Influence of High Top-Pressure Operation on Pressure Drop in a Blast Furnace

Abstract

On the basis of laboratory experiments, a series of formulas is derived to estimate a gas flow resistance of the blast furnace burdens. By applying these formulas, the total pressure drop of the blast furnace can be divided into two parts, i. e., for the upper zone where the melts do not exist and for the lower zone where the solids and the melts coexist.
The calculated results of the pressure drops of the upper and the lower zones of No1 blast furnace at Mizushima Works of Kawasaki Steel Corporation showed the following observations;
(1) When the blowing rate increases with increasing the top pressure, the pressure drop of the upper zone decreases and the pressure drop of the lower zone increases.
(2) With increasing the top pressure, loading or flooding at the lower zone plays an important role for hanging.
(3) With increasing the pressure drop of the lower zone, the scattering range of sulpher content in pig iron within a day increases.