2017_EJRNL_PP_Cihan_Ates_1.pdf
Terbatas Irwan Sofiyan
» ITB
Terbatas Irwan Sofiyan
» ITB
In this study, effect of changing biomass source on radiative heat transfer during co-firing of high-sulfur
content lignite in the freeboard of 300 kWt Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) is
investigated by using an in-house developed radiation code based on Method of Lines (MOL) solution
of Discrete Ordinates Method (DOM). The freeboard is treated as a 3D rectangular enclosure containing
gray, absorbing, emitting gas with absorbing, emitting, anisotropically scattering particles surrounded by
black/gray diffuse walls. Radiative properties of participating gases are evaluated by using Leckner’s correlations
and gray particle properties are calculated based on Planck’s distribution from the spectral Mie
solutions. Input data required for the model are provided from six combustion tests which were previously
carried out for Çan lignite with 14, 35 and 50% thermal shares of olive residue and hazelnut shells
in the fuel mixture for the same Ca/S ratio. The results show that changing the biomass source affects the
radiative properties of the particles in the freeboard through the change of particle size distribution
rather than optical properties, which may lead to significant variations in radiative wall heat fluxes
and source terms.