ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Experimental and Modeling Study on Reduction and Heat Transfer Characteristics of Single Iron Ore Pellet in H2/CO Atmospheres
Zhongjie ShenShuang SunJianliang XuQinfeng LiangHaifeng Liu
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2023 Volume 63 Issue 1 Pages 42-53

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Abstract

Experimental and modeling study was carried out for the reduction of single iron ore pellet in the H2/CO atmosphere with considering the porosity evolution and heat transfer characteristics of product layer, reaction layer, and unreacted layer. A mathematical model was proposed and validated with a good match to the experimental data. The experimental results showed that both porosity and effective diffusion coefficient increased with the reduction time, temperature, and H2 content in the gas mixtures. With the increase of temperature, the pore size presented multi-level distribution characteristics. Adding 20 vol.% CO in H2 as a threshold value (H2/CO = 8:2) proved to achieve higher reduction degree than other conditions. It was found that the addition of CO in H2 increased the temperature of the reaction layer by about 10 to 27°C higher than the initial temperature. Temperature profiles and temperature difference evolution of these three layers inside the pellet presented a first decrease, where the reduction degree was about 0.3, and then an increase during the reduction process. With more CO participated in the reaction, a delayed high-temperature reaction layer was presented from extra heat supply of CO reduction, owing to the low diffusion rate. The radiation heat was dominant for the heat transfer between the environment and iron ore pellet, while inside the pellet heat flux changed among three layers and verified with the temperature and gas atmosphere.

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© 2023 The Iron and Steel Institute of Japan.

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs license.
https://creativecommons.org/licenses/by-nc-nd/4.0/
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