Rule of Thumb for Simulating Biomass Pyrolysis In Packed Bed Reactor

The Rule of thumb for simulating biomass pyrolysis is introduced.  The important aspects includes development of governing equation, proper reaction rate equations, heat tranfer model, and volume change with reactions. Firstly, the yield of solid component undergoing the fast and slow pyrolysis in the packed bed of biomass particles has been compared with the analyzed one by the different three kinetic models (model-1: Thurner et.al, model-2: Mohan et.al, model-3: Miller et.al). From the results, the yield of solid component could be reproduced by the analysis using the model-3 even if the heating rate and the lignin content changed. Secondly, the relationship between the volume reduction process in the packed bed and the chemical reaction undergoing pyrolysis was elucidated by the formularization. From the result, the volume in the packed bed of the biomass undergoing the pyrolysis can be estimated by using the model-3 and the dependence of gas volume in the bed on the temperature.Thirdly, time course of average temperature in the packed bed of biomass can be reproduced by the numerical simulation of the thermal conduction through the pyrolysis, which is included in the change of the apparent density and the change of the biomass surface by the volume reduction.