In order to clear the effect of coke quality on coke degradation in a blast furnace raceway at high rate of pulverized coal injection, experiments by a hot model simulating the raceway were carried out. The results were as follows.
(1) Reactivity and strength of coke effect on combustion behavior of pulverized coal and coke in the raceway, coke degradation in the raceway and the raceway structure.
(2) Using high reactivity coke, thickness of reacted layer near the lump coke surface is thin.
(3) Using high reactivity and high strength coke, coke degradation in the raceway is suppressed.
