Experimental study on fast pyrolysis of free-falling millimetric biomass particles between 800 °C and 1000 °C

► Drop tube pyrolysis was tested at 800 °C and 950 °C on 350 to 800 μm wood particles. ► Solid size impacts pyrolysis time and char structure but not final products yields. ► Temperature significantly changes individual gas species yields. ► Particle shrinkage can be observed along pyrolysis under all conditions tested.