DBPapers
DOI: 10.5593/SGEM2015/B13/S3.087

THE EFFECT OF THE ADDITION OF ADDITIVES ON ASH THERMOPLASTIC PROPERTIES

H. Nadkanska, N. Smatanova, J. Zavada
Friday 7 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-33-9 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 3, 667-674 pp

ABSTRACT
Slags forming on the walls of the boiler and granulating grate lead to many negative effects. Slagging leads to clogging flue system, which can reduce the boiler output, reduce heat transfer or cause mechanical stress pipes. These negative effects can lead to unplanned shutdown of boiler. The corrosion under the formed slag can occur. The paper describes the possibility of gluing suppression on the walls of the boiler by adding MgO-based additives to the batch (Ostrava´s scud). The possibility of gluing suppression was tested in laboratory conditions where thermoplastic properties of ash were determined. The influence of the addition of NALCO 8270 on modification of thermoplastic properties of ash cannot be clearly confirmed based on the laboratory experiments. To clearly prove the additive influence other experiments will be carried out. However, recent operating results indicate that the additive increases the softening temperature of the components forming the slag and increases the slag porosity.

Keywords: slag, ash thermoplastic properties, MgO-based additive, scud

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