4 years ago

Pyrolysis Kinetics of Pre-Torrefied Woody Biomass Based on Torrefaction SeverityExperiments and Model Verification

Pyrolysis Kinetics of Pre-Torrefied Woody Biomass Based on Torrefaction SeverityExperiments and Model Verification
Amin Sarvaramini, Faïçal Larachi
A kinetic model was developed for the pyrolysis of pre-torrefied lignocellulosic biomass requiring solely knowledge of the pyrolysis kinetics of raw biomass. To predict yield and differential thermogravimetry (DTG) profiles for the pyrolysis of pre-torrefied biomass specimens, the classical three-parallel first-order pyrolysis kinetic model was modified to incorporate severity factors accounting for the impact of torrefaction time and temperature on the devolatilization of hemicellulose, cellulose, and lignin biomass components. The model also included features to account for the effect of pyrolysis heating rate on pyrolysis activation energies of the biomass components both for raw and pre-torrefied substrates. Specifically, severity factor correlations between pre-torrefaction conditions and biomass component relative weights prior to pyrolysis were developed so that the kinetic model, validated at the outset for the pyrolysis of raw biomass specimens, could also be applicable for the pre-torrefied samples. Thermal decompositions of raw and pre-torrefied birch, aspen, and sawdust specimens were tested through thermogravimetric analyses under various pyrolysis heating rates and isothermal torrefaction exposure times and temperatures. Model confrontation against pyrolysis yields and DTG rates measured at varying severities for both raw and pre-torrefied woody biomass confirmed that predicted pyrolysis yields and rates were in a good agreement with experiments.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b01123

DOI: 10.1021/acs.iecr.7b01123

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