Efficiency of pulverized coal injection (PCI) at two blast furnaces (BFs) i
n Spain and Ukraine which operate at different burden and blast conditions
has been analyzed using statistical methods, calculation of material and he
at balances and a mathematical model. Effect of PCI on the parameters of bl
ast furnace operation, pig iron quality and also on interactions between pr
ocess parameters has been studied. At high-grade burden and high parameters
of the combined blast, dependence of coke consumption rate on PC amount is
linear up to a high rate of PCI. At unfavorable burden and technological c
onditions dependence of the main furnace operating parameters on PC rate ha
s extreme character. High efficiency of PC use can be achieved at the diffe
rent conditions due to optimization of the technological regime.