Cooling Air Velocity on Iron Ore Pellet Performance Based on Experiments and Simulations

Author:

Ma Liming1,Zhang Jianliang1,Liu Zhengjian1ORCID,Cai Qiuye2,Hao Liangyuan1,Lu Shaofeng1,Jiang Huiqing1,Wang Yaozu3ORCID

Affiliation:

1. School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083, China

2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology, Beijing 100083, China

3. Institute of Artificial Intelligence, University of Science and Technology, Beijing 100083, China

Abstract

During the pellet cooling process, cooling air velocity is crucial for optimizing the cooling rate, evaluating the utilization rate of cooling heat energy, and improving pellet performance. As the simulated cooling air velocity increased, the gas temperature at the cooling endpoint decreased from 87 °C to 51 °C, and the solid temperature decreased from 149 °C to 103 °C. The total enthalpy of the recovered gas initially reduced and then increased while the heat recovery rate gradually increased. During the experiment, the inhomogeneity of pellet quality gradually increased with the rise in cooling air velocity. The effect of cooling air velocity on pellet properties is primarily reflected in the formation of cracks and low-melting liquid phases (FeO and fayalite). As the cooling air velocity increases, the softening onset temperature of the pellet decreases significantly. The melting zone decreases from 193 °C to 105 °C, and the permeability of the adhesive zone increases.

Funder

National Natural Science Foundation of China Youth Fund

National Natural Science Foundation of China

The National Youth Talent Support Program

Central Universities Foundation of China

Guangdong Basic & Applied Basic Research Fund Joint Regional Funds—Youth Foundation Projects

Publisher

MDPI AG

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