Kinetic and diffusive data from batch combustion of wood chars in fluidized bed

In this work it is studied the combustion of batches of wood char particles in a shallow fluidized bed at laboratory scale. Commercial and recarbonized chars from nut pine and cork oak parent woods were burned for bed temperatures of 600–750 °C and particle sizes range of 1.8–3.6 mm. A combustion model based on the two-phase theory of fluidization is presented to evaluate the global combustion resistance. Sherwood numbers and kinetic constants for the heterogeneous phase reaction are also assessed. Through the comparison among theoretical and experimental results, conclusions are drawn on the combustion mechanism as well as on the combustion controlling resistance. The Arrhenius law is proposed to predict the kinetic constants for the studied chars.

► Combustion of nut pine and cork oak wood char particles was studied in a laboratory shallow fluidized bed. ► Covered temperature range from 600 to 750 °C and covered particle size range from 1.8 to 3.6 mm were used. ► Commercially carbonized and recarbonized chars were tested and an Arrhenius law is proposed for these chars.