Influence of gas non-equimolar diffusion on coke solution-loss reaction

HUANG Jun-chen; WANG Qi; ZHANG Song

doi:10.13228/j.boyuan.issn0449-749x.20210511

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Iron and Steel ›› 2022, Vol. 57 ›› Issue (3) : 16-26. DOI: 10.13228/j.boyuan.issn0449-749x.20210511

Raw Material and Ironmaking

Influence of gas non-equimolar diffusion on coke solution-loss reaction

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Abstract

As an important raw material for ironmaking, coke has attracted much attention in terms of its thermal properties. The results obtained by different thermal property evaluation methods (CRI, CSR, CRR₂₅, CSR₂₅) for the same coke may be completely different, which is due to the lack of in-depth and comprehensive understanding of coke solution-loss reaction mechanism. In the process of coke solution-loss reaction, the factor of gas non-equimolar diffusion is always ignored, which leads to the deviation in understanding of coke solution-loss reaction mechanism. In order to understand the coke solution-loss reaction mechanism more clearly and comprehensively, a kinetic model considering gas non-equimolar diffusion was established.The gasification experiments of industrial coke and CO₂ with 25% solution-loss at 1 100-1 300 ℃ were carried out. The effect of gas non-equimolar diffusion on coke solution-loss reaction was explained by comparing the CO₂ effective internal diffusion coefficient, the effective area of CO₂ concentration in coke and the reaction controlling step with and without consideration of gas non-equimolar diffusion. The results show that with considering the gas non-equimolar diffusion, the CO₂ effective internal diffusion coefficient decreases and changes with temperature, reaction process and internal radius of coke. With increase of temperature, the effective area of CO₂ concentration in coke decreases, as well as the opening, area and position, and it is closer to the coke surface, meanwhile, the region of solution-loss reaction decreases. The reaction controlling step has no obvious variation trend and remains stable with the reaction process.

Key words

blast furnace ironmaking / coke / solution-loss reaction / gas non-equimolar diffusion / kinetics / model

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HUANG Jun-chen, WANG Qi, ZHANG Song. Influence of gas non-equimolar diffusion on coke solution-loss reaction[J]. Iron and Steel, 2022, 57(3): 16-26 https://doi.org/10.13228/j.boyuan.issn0449-749x.20210511

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