PURPOSE: To measure the heat flow ratio in a blast furnace with high precision and to control the blast furnance with the distribution of the ratios by obtaining the heat flow ratio with a specified equation from the molecular fraction of gaseous CO2 and N2 in the gas in the blast furnace and the volume ratio of ore in the feed stock.
CONSTITUTION: The gas in a blast furnace is sampled, and the composition of CO, CO2, and N2 is measured. The molar ratio of CO2 to N2 is obtained, and the volume ratio of ore in the feed stock is measured. The heat flow ratio γ is obtained by the equation on the basis of said values. In the equation, X is the volume ratio of ore, i.e., X=Lo/Lc+Lo, Lo is the amt. of ore, Lc is the amt. of coke, C1, C2, and (c) are respectively the specific heat (Kcal/Kg°C) of coke, ore, and gas, P1, P2, and ρ are respectively the density (Kg/m3) of coke, ore, and gas, T is the total Fe in ore, Y0, Y1 are respectively the oxidation degree of feed ore and the in the reserve zone, η and η1 are the CO2 ratio at the furnace top and the reserve zone, i.e., CO2/(CO+CO2), and N2 is the molar fraction of gaseous N2 at the furnace top.
YAMADA YUTAKA
KOUTOU HIROYUKI
TAKEBE TAKASHI
