Title: Modification of a Magnussen Constant of the Eddy Dissipation Model for biomass grate furnaces by means of hot gas in-situ FT-IR absorption spectroscopy

Authors: Robert Scharler, Thomas Fleckl, Ingwald Obernberge

Addresses: Institute of Chemical Engineering Fundamentals and Plant Engineering, Graz University of Technology, Inffeldgasse 25, A-8010 Graz, Austria ' Institute of Chemical Engineering Fundamentals and Plant Engineering, Graz University of Technology, Inffeldgasse 25, A-8010 Graz, Austria ' BIOS Bioenergiesysteme GmbH, Sandgasse 47, A-8010 Graz, Austria '

Abstract: In order to use CFD as cost-efficient tool for the design of biomass furnaces, a test of the simulation results is necessary. The present work considers the verification of the whole CFD model (combination of empirical fixed bed model and CFD sub-models) as well as the calibration of an empirical constant of the Eddy Dissipation combustion model. A number of test runs were performed at a biomass furnace with the two fuels fibreboard and wood chips as a reference. The species concentrations and temperatures were measured in-situ at three locations. Taking into consideration possible measurement uncertainties, the simulation results are reasonably accurate for the development of biomass grate furnaces. Moreover, by means of a modification of the Magnussen Constant, the accuracy of the simulation could be significantly improved.

Keywords: CFD; biomass; grate furnace; combustion modelling.

DOI: 10.1504/PCFD.2003.003776

Progress in Computational Fluid Dynamics, An International Journal, 2003 Vol.3 No.2/3/4, pp.102 - 111

Published online: 24 Dec 2003 *

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