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Influence of gas non-equimolar diffusion on coke solution-loss reaction |
HUANG Jun-chen1,2, WANG Qi1,2, ZHANG Song1,2 |
1. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China; 2. Key Laboratory of Chemical Metallurgy Engineering Liaoning Province, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China |
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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.
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Received: 27 August 2021
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