DBPapers
DOI: 10.5593/SGEM2014/B13/S4.126

THERMODYNAMIC STUDY OF UTILIZATION OF SAWDUST FROM OAK-WOOD IN THE IRON-ORE SINTERING PROCESS

J. Legemza,M. Frohlichova, R. Findorak
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, 987-994 pp

ABSTRACT
The aim of this study was to evaluate, from thermodynamic point of view, the possibilities of sawdust from oak-wood utilization in iron-ore sintering process. Sawdust from oak-wood with standard coke breeze were studied as sintering fuels. Materials used in this study were subjected to chemical and physical analyses typically used for coal and coke characterisation. Sawdust from oak-wood has lower content of fixed carbon and higher volatile matter content. Sawdust from oak-wood has relatively low calorific values (16,90 MJ/kg) compared with coke breeze (28,16 MJ/kg). It can be observed from the chemical analyses that sawdust from oak-wood has lower sulphur level and much lower ash content, in comparison with the coke breeze. In order to visualize feasibility of individual reactions depending on temperature, Gibbs equilibrium diagrams were calculated by thermodynamic modelling program HSC Chemistry 5.11. From analysis of fuels burning reactions follows, that the highest temperatures in the sintering bed (experimental about 1150 – 1360oC) are achieved with the coke breeze. Combustion of higher amount of volatile matter in sawdust from oakwood leading to the lower maximum temperatures in the sintering bed (experimental about 780 – 1180oC). It was found that less of this energy would be available in sinter making due to the evaporation of some of the volatile matter ahead of the flame front. Overall the results suggest that it is realistic to substitute maximum 8-10% of coke breeze with sawdust from from oak-wood in the iron ore sintering process.

Keywords: biomass, sawdust from oak-wood, iron-ore sintering process, thermodynamic analysis, Gibbs equilibrium diagrams

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