Devolatilization time

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.

\[t_v = 0.8\,e^{1525 / T_r} d^{1.2}\]

Nomenclature

\(t_v\) - conversion time, devolatilization time of 95% (s)
\(T_r\) - Temperature of fluidized bed (K)
\(d\) - Diameter of wood particle (mm)

Source code

chemics.devol_time.devol_time(dp, tbed)[source]

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.

Parameters
  • dp (float or array) – Diameter of biomass particle [mm]

  • tbed (float or array) – Bed temperature [K]

Returns

tv (float or array) – Devolatilization time for 95% conversion [s]

Example

>>> devol_time(2.0, 773.15)
13.2114

References

1

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.