University of Oulu

Alatarvas, Tuomas; Iljana, Mikko; Mattila, Olli; Paananen, Timo; Fabritius, Timo (2012) Gas composition change in a single sinter, pellet and coke layer in simulated blast furnace conditions. In: Wikström, Jan-Olov (ed.) SCANMET IV Proceedings of the 4th International Conference on Process Development in Iron and Steelmaking Volume 1 , pp. 385-394.

Gas composition change in a single sinter, pellet and coke layer in simulated blast furnace conditions

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Author: Alatarvas, Tuomas1; Iljana, Mikko1; Mattila, Olli2;
Organizations: 1Laboratory of Process Metallurgy, FI-90014 University of Oulu, Finland
2Ruukki Metals Oy, Rautaruukintie 155, FI-92100 Raahe, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.2 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe202101151898
Language: English
Published: SCANMET, 2012
Publish Date: 2021-01-15
Description:

Abstract

In spite of the vast amount of research regarding the operation of blast furnace, the gas composition change in a single charge material layer in a blast furnace is not an extensively studied research area. Iron-bearing material and coke are charged in turn as layers into the blast furnace as raw material. With no percolation of layers taken into account, the composition of gas varies in turn in the blast furnace shaft, losing its reducing potential in an iron-bearing material layer and being reformed in a coke layer.

In this paper, the effect of reactions in sinter, pellet and coke layers on the gas composition between the blast furnace top and the cohesive zone has been discussed. The gas was analysed on-line on multiple heights of a tube furnace loaded with a material bed of 1.0 m in height and uniformly heated at a rate of 2°C/min or 3°C/min up to 1100°C or 1200°C. As a result, the H₂–H₂O gas composition change occurred in a higher temperature than the CO–CO₂ change in sinter, pellet and coke beds. This led to a conclusion that the reduction of iron oxides by hydrogen and gasification of coke by water vapour started in somewhat higher temperatures than the reactions with carbonaceous gas components. Additionally, olivine pellets were more reducible in moderate temperatures compared with sinter and the utilisation rates of CO and H₂ gases rose higher in a pellet bed than in a sinter bed, mainly due to the higher hematite percentage in pellets.

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ISBN Print: 978-91-637-0670-7
Pages: 385 - 394
Host publication: SCANMET IV Proceedings of the 4th International Conference on Process Development in Iron and Steelmaking Volume 1
Host publication editor: Wikström, Jan-Olov
Conference: International Conference on Process Development in Iron and Steelmaking
Type of Publication: B3 Article in conference proceedings
Field of Science: 216 Materials engineering
Subjects:
Funding: Ruukki Metals Oy and the Finnish Funding Agency for Technology and Innovation (TEKES) are acknowledged for funding this study.
Copyright information: © The Authors and SCANMET.