Journal
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
Volume 129, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2021.105652
Keywords
Iron ore sintering; Methane injection; Near-inlet region; Oxygen; Reactive porous media
Categories
Funding
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51721004]
- National Key R&D Program of China [2017YFB0603500]
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This study examines the effects of methane and oxygen injection concentrations on sintering performance, showing that high methane concentration can expand the melting zone and increase the melting quantity index, while low oxygen concentration in the reacting flow can slow down the propagation speed of the melting zone, thus improving local sintering performance.
The partial replacement of a hydrogen-based gaseous fuel for solid fossil fuel plays a key role in increasing the sustainable energy share in sinter plants. The imbalanced heat distribution is a long-standing problem that can adversely affect the energy efficiency of sintering process, especially in the near-inlet region. In the present study, the impacts of methane and oxygen injection concentrations on sintering performance were numerically examined. Compared with previous studies, the maximum methane concentration examined was extended significantly from 1.0% to 5.5%, which is very close to the lean flammable limit (5.3%). Computations demonstrated that methane concentration had considerable effects on the methane combustion dynamics and solid fuel oxidation. In the near-inlet region, injecting methane at a high concentration (3.5%) remarkably expanded the melting zone and increased the melting quantity index. In addition, the results indicated that reacting flow with a low oxygen concentration could decrease the melting zone propagation speed in the nearinlet region, thereby improving the local sintering performance. However, the reacting flow with high methane concentration and low oxygen concentration had negative impacts on the sintering speed. The recommended operating conditions were determined based on parametric studies to achieve a tradeoff between the sinter quality and productivity.
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