DBPapers
DOI: 10.5593/SGEM2014/B13/S4.121

STUDY OF SCAFFOLD FORMATION MECHANISM IN BLAST FURNACE STACK

M. Alica, F. Maria
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-09-4 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 3, 949-956 pp

ABSTRACT
The scaffold is a build-up on blast furnace refractory (BF) lining, which is generated in temperature zones from 800 to 1100°C without presence of liquid phase. Such zones are middle and upper part of blast furnace stack. The scaffolds consist of dust portions of particular charge components (coke dust, pellet and sinter fine particles) and have increased content of Na, K, Zn, Pb that support generation of scaffolds. The generation of scaffolds is an undesired phenomenon, which negatively impacts stability of blast furnace operation. The release of scaffold and its following shift towards BF hearth may result, depending on its size, in serious violation of BF thermal balance or even in tuyers’ damage in case of direct contact with a scaffold. Moreover, the occurrence of scaffolds reduces furnace’s working volume. Several scaffolds were analyzed from perspective of factors supporting their generation and the factors having impact upon the release of scaffolds from furnace refractory lining.

Keywords: blast furnace, build-up, scaffold, microstructure

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