Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 153, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2020.119577
Keywords
CFD-DEM simulation; Ellipsoidal particle; Heat transfer; Dynamic behaviours; Blast furnace raceway
Categories
Funding
- NSFC [51606040, 51904122]
- Liaoning Province Natural Science Foundation [2019-MS-125]
- Key Project of Jiangxi Provincial Research and Development [20192BBHL80016]
- Fundamental Research Funds for the Central Universities [N182504019]
- Shenyang Young and Middle-aged Science and Technology Innovation Talent Support Program [RC170512]
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In this paper, the coupled computational fluid dynamics (CFD) and discrete element method (DEM) scheme is used to investigate the microstructure and heat transfer characteristics in a blast furnace (BF) raceway. The impact of gas velocity and particle shape on raceway evolution, microstructure characteristics, and particle temperature and voidage distributions is comprehensively explored based on the voidage change caused by the consumption of coke particles. Numerical results show that the oblate ellipsoidal particle system possesses higher average voidage in the original packing state and implements the faster burden descending rate than the prolate one under the same inlet velocity. For the non-spherical particle systems, larger contact forces exist in the oblate ellipsoidal particle system while the contact forces in the prolate ellipsoidal particle system are smaller. More uniform temperature distribution and higher average voidage can be caused by higher inlet gas velocities. Meanwhile, more prolate ellipsoidal particles are consumed than oblate ones under the same inlet velocity. These findings could be beneficial for understanding the kinetic and thermodynamic behaviors of particulate system within a BF raceway. (C) 2020 Elsevier Ltd. All rights reserved.
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