Thermal reaction mechanism of biomass and determination of activation energy
I.drying section

 The first step of biomass pyrolysis corresponds to water evaporation. Thermal analysis instrument was used to determine the mass and heat change of fir wood during drying process. Non-isothermal drying kinetics model was derived to explore the mechanism of heat and mass transfer. The results show that moisture content decreases rapidly and weight loss peak appears at 80℃. Page model for non-isothermal drying kinetics can well simulate wood drying process and the drying activation energy is 12.6kJ/mol. Water and heat transfer have close relationship and the dry heat is mainly used for water evaporation. The value of heat requirement is 426kJ/kg and the simulated results show good agreement with experimental values.