A correlation to estimate the conversion time of cylindrical beech wood particles in a sand bed fluidized by nitrogen gas was developed by Colomba Di Blasi and Carmen Branca. The correlation is an empirical power-law relation corresponding to a conversion of 95% (also referred to as a devolatilization time of 95%). It was developed from experiments conducted at fast pyrolysis conditions where bed temperatures varied from 712-1107 K and particle diameters ranged from 2-10 mm. According to the Di Blasi and Carmen article, similar correlations exist for coal particles.
Correlation for 95% devolatilization time for wood particles. Refer to Equation 2 in the Di Blasi 1 article which is based on beech wood cylinders in a fluidized sand bed.
dp (float or array) – Diameter of biomass particle [mm]
tbed (float or array) – Bed temperature [K]
tv (float or array) – Devolatilization time for 95% conversion [s]
>>> devol_time(2.0, 773.15) 13.2114
Colomba Di Blasi and Carmen Branca. Temperatures of Wood Particles in a Hot Sand Bed Fluidized by Nitrogen. Energy and Fuels, 17, pp. 247-254, 2003.