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Motivated by the aim of improving the understanding of reaction kinetics, thermogravimetric measurements (heating rates of 5, 10 and 20K/min up to a temperature of 873K) in air have been made of wood impregnated with diammonium phosphate and diammonium sulfate and, for comparison purposes, of untreated wood. Wood devolatilization is always followed by char combustion, but the added salts introduce...
Weight loss curves of two wood species (beech and Douglas fir) have been measured in air for four heating rates between 5–40 K/min and a final temperature of 873 K. A four-step series mechanism describes well the details of the thermogravimetric curves of the devolatilization/combustion process. The rates of the first three reactions are linear in the solid mass fraction and the activation energies...
The convective drying of pine wood cylinders (40mm diameter) in hot air has been investigated experimentally for conditions reproducing those encountered in the drying section of fixed-bed updraft gasifiers (nominal velocities of 0.4-1.2m/s and maximum air temperatures of 435-600K). Temperature profiles show a drying zone slowly propagating from the heat exposed surfaces towards the inside, whereas...
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