Abstract
Alkali metal is one of the key critical factors that determine the coke degradation . Previous studies on the influence of alkali metal on coke structure were mostly focus on the catalysis of alkali carbonates for coke gasification reaction. Besides, the difference of alkali metal and coke gasification effects on coke degradation was still not clear. Highly reactive coke developed by Nippon Steel was proved to increase the reaction efficiency and to decrease CO2 emission effectively. Therefore, conventional coke and highly reactive coke adsorbed 5% sodium were studied in this paper. Coke degradation tests were undertaken in atmosphere of N2 and CO2 . SEM, EDS and XRD were employed to analyze samples. Results showed that the degradation of conventional coke strength by sodium was stronger than highly reactive coke in the atmosphere of N2. The effect of CaO catalyst on the coke reactivity has been interpreted as a change in highly reactive coke microstructure and strength.
References
K. Li et al., The evolution of structural order, microstructure and mineral matter of metallurgical coke in a blast furnace: a review. Fuel 133, 194–215 (2014)
M. Lundgren et al., The evolution of structural order as a measure of thermal history of coke in the blast furnace. Metal. Mater. Trans. B 45(2), 603–616 (2014)
S. Gupta et al., Effect of CO2 gasification on the transformations of coke minerals at high temperatures. Energy Fuels 21(2), 1052–1061 (2007)
T. Hilding et al., Degradation behaviour of a high CSR coke in an experimental blast furnace: effect of carbon structure and alkali reactions. ISIJ Int. 45(7), 1041–1050 (2005)
H. Zhao, S. Cheng, New cognition on coke degradation by potassium and sodium in alkali enriched regions and quantificational control model for BF. J. Univ. Sci. Technol. Beijing 34(3), 333–341 (2012)
B.K. Chan, K.M. Thomas, H. Marsh, The interactions of carbons with potassium. Carbon 31(7), 1071–1082 (1993)
S. Gupta et al., Coke graphitization and degradation across the tuyere regions in a blast furnace. Fuel 113, 77–85 (2013)
H. Zhao et al., Degradation effect of potassium and sodium on coke. J. Univ. Sci. Technol. Beijing 35(4), 438–447 (2013)
K. Li et al., Influence of alkaline (Na, K) vapors on carbon and mineral behavior in blast furnace coke. Fuel 145, 202–213 (2015)
S. Nomura et al., Improvement in blast furnace reaction efficiency through the use of highly reactive calcium rich coke. ISIJ Int. 45(3), 316–324 (2005)
M. Sato et al., Prediction of next-generation ironmaking process based on oxygen blast furnace suitable for CO2 mitigation and energy flexibility. ISIJ Int. 55(10), 2105–2114 (2015)
M. Natio et al., Development of production and utilization technology of z with high strength and high reactivity. Tetsu to Hagane 96(5), 201–208 (2010)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2017 The Minerals, Metals & Materials Society
About this paper
Cite this paper
He, Z., Zhan, W., Zhang, J., Pang, Q., Zhang, S., Tian, C. (2017). Influence of Sodium on Coke Microstructure in Different Reaction Atmosphere. In: Zhang, L., et al. Energy Technology 2017. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-52192-3_17
Download citation
DOI: https://doi.org/10.1007/978-3-319-52192-3_17
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-52191-6
Online ISBN: 978-3-319-52192-3
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)