Heat Transfer Conditions in a Rotary Kiln Test Furnace Using Coal, Biomass and co-firing Burners

Other conference contribution, 2016

In this work the radiative heat transfer in a 580 kWth pilot scale test furnace resembling a full scale rotary kiln used for production of iron ore pellets has been studied. The aim has been to quantify the radiative heat transfer in coal and co-firing flames in a project which examines the use of biomass in the grate-kiln process. Three cases of coal and co-firing are in this work studied and evaluated using a detailed radiation model. The model treats the furnace as an axisymmetric and infinitely long cylinder. Overall, the differences in radiative intensities and heat fluxes between the three studied fuel combinations are minor which implies that introduction of renewable fuels by co-firing in a full scale rotary kiln should be feasible with respect to heat transfer conditions. The modeling results show reasonable to good predictivity compared to the measured intensity data, which implies a satisfactory quality of the collected experimental data.