Disintegration of Coke by Mechanical Impact under Gasification Reaction

Abstract

In order to elucidate the behavior of coke fines in blast furnace, fundamental experiments were carried out on the disintegration of coke during gasification reaction accompanied by mechanical impact.
The following results were obtained:
(1) Coke fines of high ash content are generated with the progress of gasification, which suggests the close correlation between generation of coke fines and gasification.
(2) Coke fines generate increasingly when the mechanical impact strength is beyond a critical value.
(3) Reaction temperature, gas composition and coke size also affect the generation of coke fines causing a different rate of gasification.
A mathematical model was introduced using the rate equation of coke fine generation based on the experimental results. The calculation results by this model agree very well with the experimental results. The model, therefore, is supposed to be applied for the investigation of the behavior of coke fines in blast furnaces.