(757b) Influence of Main Components of Woody Biomass on Fast Pyrolysis

Heat and mass transfer have been investigated during fast pyrolysis of biomass powder packed bed. For cellulose powder, temperature at the center of the bed, T_C, increased monotonously with time due to thermal conduction for T_C < 500K. The temperature increased slowly with time due to heat of endothermic cellulose decomposition for 500 K < T_C < 600 K. On the other hand, the exothermic behavior was observed at T_C > 600 K. For lignin powder, only exothermic behavior was observed at T_C > 600K. Furthermore, the char yields after fast pyrolysis of cellulose powder and lignin powder were about 11 % and 70 %, respectively.  Therefore, it was found that the exothermic behavior could be occurred by the re-char formation by agglomeration of tar.