Abstract
The pyrolysis of woody biomass has been studied experimentally in attending to the mass transfer. The transfer has been controlled by three phenomena. Firstly, the volume of gaseous products doesn't change and main gases are not detected by Gas Chromatography. Therefore the evaporation of water can be occurred. Secondary, the volume increases dramatically because the cellulose in the biomass can be decomposed. Finally the volume increases slightly and approaches to the light gas. The pyrolysis of the biomass has been modeled by using the heat history, which is regarded as the heating rate of the biomass layer.
