Journal
PLOS ONE
Volume 16, Issue 1, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0245124
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Funding
- National Key RAMP
- D Program of China [2017YFB0304300, 2017YFB0304303]
- National Key RAMP
- D Program of China
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This study investigated the reaction mechanisms of cokes with different CRIs in a blast furnace, showing that high-CRI coke exhibited higher rates of pyrolysis, polycondensation, gasification, and dissolution compared to low-CRI coke. High-CRI coke also had a faster consumption rate during coke-sinter reduction.
The reaction characteristics and mechanism of coke with different coke reactivity indices (CRIs) in the high-temperature zone of a blast furnace should be fully understood to correctly evaluate the coke quality and optimize ironmaking. In this work, low-CRI coke (coke A) and high-CRI coke (coke B) were charged into a thermogravimetric analyzer to separately study their microstructural changes, gasification characteristics, and reaction mechanism under simulated cohesive zone conditions in a blast furnace. The results show that both coke A and coke B underwent pyrolysis, polycondensation, and graphitization during the heat treatment. The pyrolysis, polycondensation, gasification speed, and dissolution speed rates of coke B were higher than those of coke A. Direct and indirect reduction between sinter and coke occurred in the cohesive zone and had different stages. The consumption rate of coke B was faster than that of coke A during the coke-sinter reduction. The carbon molecules of coke A must absorb more energy to break away from the skeleton than those of coke B.
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