Title: Influence of temperature profile in an annular shaft kiln on calcination

Authors: Andrej Senegacnik, Janez Oman, Brane Sirok

Addresses: Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, Ljubljana, Slovenia. ' Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, Ljubljana, Slovenia. ' Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, Ljubljana, Slovenia

Abstract: The paper discusses an experimental measurement of the vertical temperature profile and kiln gas composition in an annular shaft kiln. The results obtained confirm that calcination in the kiln begins at a temperature between 820°C and 830°C. From energy balance, kiln gas composition and the samples of partially burned stones from the kiln the average heat transfer coefficient from kiln gases to the stones is determined, as well as the calcination distribution within the kiln. Modelling of the calcination process in an annular shaft kiln was performed on the basis of the measured temperature profile. The results of this model were in good agreement with those for samples of partially calcinated stones taken from the area of the lower and upper burners.

Keywords: lime burning; annular shaft kilns; temperature profiles; calcination; kiln gas composition; heat transfer.

DOI: 10.1504/IJMMP.2006.010630

International Journal of Microstructure and Materials Properties, 2006 Vol.1 No.2, pp.241 - 257

Published online: 09 Aug 2006 *

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