Effect of particle size and temperature on woody biomass fast pyrolysis at high temperature (1000–1400°C)

Abstract Fast pyrolysis of wood was conducted in a drop tube furnace to study the influence of temperature (1000–1200–1400 °C) and particle size (0.35–0.80 mm) for a particle residence time of some seconds. No effect of particle size has been observed on final pyrolysis products. At 1000 °C, much more gas and tar are produced than char (yield of 96% versus 4%); hydrocarbons, including light species and tar, present a considerable yield of 26%. From 1200 °C, the drastic hydrocarbons decomposition, emphasized with temperature, leads to high yields in soot, H 2 and CO. At 1200 °C, no tar are detected; at 1400 °C only low amounts of CH 4 and C 2 H 2 still remain. Under the explored conditions, char and soot gasification with H 2 O and CO 2 , species produced during pyrolysis, is kinetically blocked. However, even if carbonaceous solids do not seem to be considerably affected by gasification, they suffer some changes when temperature is increased.

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