高温での CO_2 との反応によるコークス強度劣化(コークス)(<特集>製銑技術の拡大と高度化)

概要

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The deterioration of coke in the blast furnace has been evaluated as the change in coke size due to reaction between coke and CO_2 gas. To clarify the deterioration mechanism, a series of experiment has been carried out at each reaction temperature using apparatus for high temperature CO_2 reaction. The findings obtained are as follows : (1) The deterioration of coke by CO_2 gasification reaction was largely changed with the temperature for CO_2 reaction. (2) Reaction up to 1300℃ : Due to the selective reaction by the anisotropic texture of coke, reaction proceeded to the central core of the lump and weight loss affected the decrease of coke strength. (3) Reaction between 1300℃ and 1500℃ : Coke lump reacted uniformly on its surface, thereby holding very low reaction rate in the core of the coke lump. Weight loss did not affect the decrease of coke strength. (4) As CO_2 reaction below 1300℃ decreased remarkably the coke strength, if weight loss caused by the reaction lower than 1300℃ could be decreased, this countermeasure would become an important method for the control of coke deterioration. (5) A good quality coke at high temperature showed uniform microstructure and high reactivity with CO_2 gas at pore-wall.
社団法人日本鉄鋼協会の論文
1987-11-01