Abstract
An experimental analysis of the ignition front propagation of eight biomass fuels in a one-dimensional fixed-bed combustor (batch reactor) is carried out and these biomass materials are also researched by thermogravimetry to study their thermal behaviour during devolatilization. The analysis of the thermogravimetric data has been centered on the results obtained for 50 °C · min−1 (maximun heating rate of the thermogravimetric (TG) equipment), taking into consideration that it is the nearest heating rate value to the one at which the heating process is carried out in the batch reactor. The influence of the TG-determined devolatilization rate in the burning behaviour of biomass in situations of packed bed combustion is analyzed. This study reveals that the biomass fuels with higher devolatilization rates during pyrolysis are the ones with a higher velocity of propagation of the ignition front during combustion processes in the fixed-bed combustor. The thermal decomposition characteristics during devolatilization are also evaluated, revealing that the most reactive biomass fuels upon pyrolysis are the ones which also produce the higher volatile yield during TG experiments at 50 °C · min−1.
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