CDQ上部プレチャンバーにおける部分燃焼空気吹込みのコークス再加熱現象に及ぼす影響の数値解析(コークス品質・コークス改質技術)(<特集>革新的コークス製造技術開発への挑戦)

概要

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In this study, the mathematical model for the solid-gas two phase combustion simulation is developed in order to analyze the effect of partial combustion air introduction on coke re-heating behavior in Coke Dry Quencher (CDQ). By introducing combustion air into the pre-chamber of CDQ, the coke quality is expected to be improved. Thus, it is necessary to understand the effect of partial air introduction on transport phenomena in CDQ. The difference of the transport phenomena such as gas flow, gas and coke temperature and concentration of chemical species in CDQ between with and without partial combustion is mainly discussed in this paper. Temperature is about 370K higher in both solid and gas phase with partial air than that without partial combustion around the surface of coke bed due to heat release of volatile matters combustion. In the middle of CDQ, however, the simulation results with partial combustion air introduction show the larger decreasing rate of coke temperature than that without air introduction because not only heat transfer between coke and quenching gas but also endoergic reactions such as C-CO_2 and C-H_2O are yielded due to higher temperature and more CO_2 and H_2O. Coke temperature is almost the same, that is 500K, at the bottom of CDQ, coke outlet.
社団法人日本鉄鋼協会の論文
2004-09-01