Reaction behavior of coke lump in raceway of blast furnace with pulverizedcoal injection

Reaction behaviors of a coke lump in raceway of blast furnaces which pulver ized coal injection technology was adopted were studied by using a horizont al pulverized coal reactor, in the experiments two types of coke lump were used as samples. In the experiments, the reaction behaviors of coke lump we re continuously observed by an 8 mm video camera system. Mass change of the coke lump was weighed at each exposure time, and surface temperature of th e coke lump was also continuously measured by a two-color pyrometer. Additi onally, both the reacting coal particles and gas were sampled and analyzed, and the deposition on the coke surface was also analyzed. In order to eluc idate the effect of ash particles in coal on the coke reaction, LPG was als o supplied as a fuel into the reactor instead of coal. As a result, mass loss of coke in the coal combustion is larger than that i n the LPG combustion. When the coal particles collide with the coke at the surface, the ash particles easily stick there and spherical molten ash is f ormed on the surface. For the LPG combustion, only small spherical molten a sh resulted from the coke is formed. Those results suggest that ash particl es of the coal may enhance coke degradation due to chemical interactions be tween coal ash and coke.