Title: Modelling of pulverised coal combustion by a Eulerian-Eulerian two-phase flow formulation

Authors: A.C. Benim, B. Epple, B. Krohmer

Addresses: Department of Mechanical and Process Engineering, Dusseldorf University of Applied Sciences, Josef-Gockeln-Str. 9, Dusseldorf D 40474, Germany. ' Faculty of Mechanical Engineering, Department of Energy Technology and Energy Systems, Technical University of Darmstadt, Petersenstr. 0, Darmstadt D 64287, Germany. ' ALSTOM Power Boiler GmbH, Augsburger Str. 712, Stuttgart D 70329, Germany

Abstract: This paper evaluates a Eulerian-Eulerian modelling of the dispersed two-phase flow in pulverised coal combustion. In contrast to the commonly employed Eulerian-Lagrangian procedures, which treat the gas phase by a Eulerian and the particulate phase by a Lagrangian frame of reference, the presently investigated approach applies a Eulerian description to both phases. In our implementation, the model is further simplified assuming a mechanical and thermal equilibrium between the phases. For validation, two- and three-dimensional furnaces with different thermal loads have been analysed. Results have been compared to those obtained by Eulerian-Lagrangian formulations and measurements. It has been shown that the present Eulerian-Eulerian approach provides a comparable overall accuracy to the Eulerian-Lagrangian formulation, with substantially lower CPU requirements for large-scale utility boilers, and, thus provides an attractive alternative for this bracket of problems.

Keywords: pulverised coal combustion; Eulerian-Eulerian modelling; two-phase flow; combustion modelling; CFD; computational fluid dynamics.

DOI: 10.1504/PCFD.2005.007067

Progress in Computational Fluid Dynamics, An International Journal, 2005 Vol.5 No.6, pp.345 - 361

Published online: 17 May 2005 *

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