炭素の結晶・非結晶の割合を考慮したコークスガス化反応の速度解析

抄録

Gasification of metallurgical coke was studied at 1000, 1200, 1400°C with Ar-CO-CO₂ mixtures. Reaction of coke in blast furnace is dominant from about 900°C. And at the same time, growth of graphite crystal (crystallite) in coke begins to occur from that temperature.
In present paper, two types of carbon crystal were classified by means of X-ray diffraction. One is crystallite that contribute to X-ray diffraction, another is noncrystalline carbon that contribute only to background intensity. In this study, reaction model that the two kinds of carbon have different reactivity and react simultaneously and independently, was developed and kinetic analysis was performed.
Following results were obtained.
(1) Lc increases as function of temperature and there is no influence of reaction. (2) La increases as function of temperature in Ar atmosphere. But in existence of reaction, the size of La is so smaller. From this result, it was considered that the gasification reaction proceeds such as mode of decreasing La. And reaction mechanism combining to characteristic of crystallographic structure is proposed.