Title: Emission formation during wood log combustion in fireplaces – part II: char combustion stage

Authors: J. Saastamoinen, M. Huttunen, P. Kilpinen, L. Kjaldman, H. Oravainen, S. Bostrom

Addresses: VTT Technical Research Centre of Finland, P.O. Box 1603, FI-40101 Jyvaskyla, Finland. ' VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Finland. ' University of Kuopio, Department of Environmental Sciences, P.O. Box 1627, FI-70211 Kuopio, Finland. ' VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Finland. ' VTT Technical Research Centre of Finland, P.O. Box 1603, FI-40101 Jyvaskyla, Finland. ' Process Flow Ltd Oy, Puolanpuisto 1 b A 21, FI-20100 Turku, Finland

Abstract: A simplified simulation model of heat storing fireplaces during combustion of residual thin char bed was developed. When the bed model is coupled with CFD calculations for the furnace above the bed, the emissions can be predicted. Especially the time instant of maximum CO emissions is considered. The following results (output quantities) can be calculated with the coke-bed model: bed temperature, composition of gases leaving from the bed (CO, CO₂, O₂ and NO), and release of carbon from the bed. The following input data are required: primary air rate, particle size, grate-area, bed thickness, bed porosity, and effective furnace radiation.

Keywords: CFD; wood logs; biomass combustion; emissions; char combustion; computational fluid dynamics;

DOI: 10.1504/PCFD.2006.010029

Progress in Computational Fluid Dynamics, An International Journal, 2006 Vol.6 No.4/5, pp.209 - 216

Published online: 09 Jun 2006 *

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