This
work studies the radiative heat transfer in a 580 kWth pilot
scale test furnace that resembles a full-scale rotary kiln
for iron ore pellet production. The aim is to quantify the radiative
heat transfer in coal and cofiring flames and also to study the possibility
to model the radiative heat transfer for such combustion conditions.
Three combustion cases of coal and cofiring are studied, and an evaluation
is made using a detailed radiation model. The test furnace is cylindrical
and refractory lined but does not rotate and no iron ore pellet bed
material is included. In-flame measurements of temperature, gas composition,
particle concentration, radiative intensity, and radiative heat flux
are conducted for the different fuels and fuel combinations. Overall,
the differences in measured radiative intensities and heat fluxes
among the three studied fuel cases are minor, which implies that introduction
of renewable fuels by cofiring in a full-scale rotary kiln should
be feasible with respect to heat transfer conditions. In the model,
the furnace is treated as an axisymmetric and infinitely long cylinder,
and gas properties are calculated with a statistical narrow-band model,
while particle properties are calculated using Mie theory. The modeling
results show reasonable to good predictivity compared to the measured
intensity data. This indicates that the experimental data is of good
quality but also indicates the potential use of the model in full-scale
rotary kiln calculations in future work.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.