Kinetic modelling of the pyrolysis of biomass and biomass components

The kinetics of the pyrolysis of lignocellulosic materials was studied with a view of providing simple kinetic models for engineering purposes. Experimental data obtained by means of thermal analysis techniques suggest that the pyrolysis of fine particles (below 1 mm) can be considered to be controlled by pyrolysis kinetics. The rate of pyrolysis of one biomass type can be represented by the sum of the corresponding rates of the main biomass components (cellulose, lignin, hemicellulose). The kinetics of each of these components was simulated by a kinetic scheme capable of predicting the pyrolysis rate and the final weight-loss for a wide range of pyrolysis parameters including various heating conditions. On a \ue9tudi\ue9 la cin\ue9tique de la pyrolyse de mat\ue9riaux lignocellulosiques dans le but de fournir des mod\ue8les cin\ue9tiques simples \ue0 des fins d'ing\ue9nierie. Des donn\ue9es exp\ue9rimentales obtenues par le biais de techniques d'analyse thermique permettent de croire que la pyrolyse de particules fines (au-dessous de 1 mm) peut \u11btre contr\u1d2l\ue9e par la cin\ue9tique de pyrolyse. La vitesse de pyrolyse d'une biomasse donn\ue9e peut \u11btre repr\ue9sent\ue9e par la somme des vitesses correspondantes des composants de biomasse principaux (cellulose, lignine, h\ue8micellulose). La cin\ue9tique de chacun de ces composants a \ue9t\ue9 simul\ue9e par un sch\ue9ma cin\ue9tique capable de pr\ue9dire la vitesse de pyrolyse et la perte de poids finale pour un large \ue9ventail de param\ue8tres de pyrolyse, y compris de conditions vari\ue9es de chauffe