Microstructure evolution of coke under CO2 and H2O atmospheres

Zhao, Jun; Zuo, Haibin; Ling, Chao; Guo, Wentao; Wang, Jingsong; Xue, Qingguo

doi:10.1007/s42243-019-00326-7

Cited by 7 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under the same temperature and reaction time, the mass loss of coke in the condition of 100%H 2 O is about 30% more than that of 100%CO 2 , which indicates that the reaction capacity between H 2 O and coke is higher than that of CO 2 . It is reported that the activation energy of adsorption and interfacial reaction under H 2 O atmosphere alone is the smallest in the process of carbon melting loss, that is, the most prone to reaction; whereas it is the highest in CO 2 atmosphere, and it is between the two in the mixed atmosphere of CO 2 and H 2 O [33]. H 2 O molecules react more easily with coke because of its small size, strong expansion capacity and the high activation energy required for the reaction between CO 2 gas molecules and coke.…”

Section: Coeffect Of Co 2 and H 2 O On Specific Surface Area And Pore...mentioning

confidence: 99%

Microstructure Evolution Behavior of Blast-Furnace Coke under Different Gasification Reaction Conditions

Yu²,

Chang³

et al. 2022

Coatings

View full text Add to dashboard Cite

With the development of large-scale blast-furnace and oxygen-rich coal-injection technology, as well as national green and low-carbon policy requirements, the ironmaking process has increasingly strict requirements for blast-furnace raw materials, such as new and higher requirements for coke quality and thermal performance. In this study, the melting loss reaction in a blast furnace was simulated under laboratory conditions and the microstructure evolution of coke after melting loss under CO2 and CO2 + H2O conditions was studied. The results showed that under a CO2 atmosphere, the specific surface area and pore volume of coke and the number of micropores in coke first increased and then decreased with the increase in reaction time, while the average pore size first decreased from 17.289 to 8.641 nm and then increased to 9.607 nm. In the gasification reaction between CO2 and coke, the relative content of the graphitized structure (IG/IAll) increased first, then decreased and then increased with the increase in reaction time, while the change trends of disordered structure (ID3/IG) and unstable structure (ID4/IG) were opposite to IG/IAll, indicating that coke still tended to be more orderly with the increase in time. In the mixed atmosphere of CO2 and H2O, the specific surface area and IG/IAll of coke increased with the increase in H2O content. However, when the proportion of H2O exceeded 50%, the specific surface area decreased slightly, and the pore-size value corresponding to the peak value in the pore-size distribution curve shifted to the right, and the average pore-size increased in the nanosize range.

show abstract

Section: Coeffect Of Co 2 and H 2 O On Specific Surface Area And Pore...mentioning

confidence: 99%