抄録
In order to clarify the coke degradation mechanism in the raceway of blast furnace, model experiments were conducted based on the conditions that were possible to occur in the above region by consideration of the reaction form, reaction temperature, reaction degree and impact energy with 15 kinds of coke having different strength and reactivity.
In the above region, fine coke (-1 mm) by abrasion and small size coke (19 mm) by bulk breakage are genarated. From the coke with much small size coke generation, fine is also much generated and fine coke generation is controlled by the strength of coke at room temperature.
Small size coke generation is controlled by micro pore volume distribution. From the coke having the following micro pore volume distribution, small size coke is little generated:
(a) Coke with small amount of micro pore and large ratio of pore under 10 μm
(b) Coke with large amount of micro pore and small ratio of pore under 10 μm
CO2 gas is difficult to enter into the micro pore under 10 μm in the particle having the above micro pore volume distribution.
