Title: Evaluation of the 3D-furnace simulation code AIOLOS by comparing CFD predictions of gas compositions with in-furnace measurements in a 210MW coal-fired utility boiler

Authors: Hermann Knaus, Uwe Schnell, Klaus R.G. Hein

Addresses: Institute of Process Engineering and Power Plant Technology (IVD),University of Stuttgart, Pfaffenwaldring 23, 70550 Stuttgart, Germany. Institute of Process Engineering and Power Plant Technology (IVD),University of Stuttgart, Pfaffenwaldring 23, 70550 Stuttgart, Germany. Institute of Process Engineering and Power Plant Technology (IVD),University of Stuttgart, Pfaffenwaldring 23, 70550 Stuttgart, Germany

Abstract: The furnace of a pulverised coal-fired utility boiler with a thermal output of 210MW, with dimensions of 8m x 8m x 29m and 12 burners located on three levels, is considered. Coal combustion is described by a five-step-reaction scheme. The model covers two heterogeneous reactions for pyrolysis and char combustion and three gas phase reactions for the oxidation of volatile matter. A standard k, ε-model is used for the description of turbulence. The interaction of turbulence and chemistry is modelled using the Eddy Dissipation Concept (EDC). The transport equations for mass, momentum, enthalpy and species are formulated in general curvilinear co-ordinates enabling an accurate treatment of boundaries and a very good control over the distribution of the grid lines. The discretisation is based on a non-staggered finite-volume approach and the coupling of velocities and pressure is achieved by the SIMPLEC method. Numerical diffusion is minimised by the use of the higher-order discretisation scheme MLU. The accuracy of the predictions is demonstrated by comparing the computational results with in-furnace measurements of carbon monoxide, carbon dioxide and oxygen concentrations and of temperatures.

Keywords: CFD; finite volume; turbulent flow; coal combustion; radiative heat transfer; coal-fired utility boiler.

DOI: 10.1504/PCFD.2001.001471

Progress in Computational Fluid Dynamics, An International Journal, 2001 Vol.1 No.1/2/3, pp.62-69

Published online: 04 Jul 2003 *

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