III International Conference

PP-I-64DEVELOPMENT OF KINETIC MODELS OF CELLULOSE-BASED BIOMASSPYROLYSISKhromova S.A., Zavarukhin S.G., Yakovlev V.A., Parmon V.N.Boreskov Institute of Catalysis SB RAS, Novosibirsk, RussiaE-mail: khromova@catalysis.ruThe kinetic models of cellulose-based biomass pyrolysis were investigated at the inertatmosphere using TGA and DTG analysis in isothermal or dynamic (non–isothermal) mode.The non-isothermal decomposition was studied at different heating rates and for the differentparticle size fractions. It was shown that the kinetic nucleation model of auto-accelerateddecomposition reaction has a best fit to weight-loss of sample. The kinetic parameters ofreactions (values of pre-exponential constant and activation energy) were determined usingthe method of Coats-Redfern and numerical model. Correlation between weight-loss andcomposition of gaseous products of pyrolysis was also defined.In view of the increase of energy demand, the high costs of fossil fuels and disposal, aswell as the environmental concern about levels of CO 2 in the atmosphere, the use of biomassto provide partial substitution of fossil fuels for steam and power generation is of growingimportance. The flash and slow pyrolysis of biomass is the main method for bio-fuelproduction. A lot of parameters influences on yield and quality of biomass pyrolysis products:gas, liquid and solid. The temperature, thermotreatment time, type of cellulose-basedbiomass, impurities content, size of biomass particles are most important factors influencingon the composition and distribution of products.Knowledge of the chemical composition, the thermal behaviour and the reactivity ofagricultural and wood waste during pyrolysis is very important for the effective desing andoperation of the termochemical convertion units, given that solid devolatilization is always afundamental step. Thermoanalytical techniques, in particular thermogravimetric analysis(TGA) and derivative thermogravimetry (DTG) allow this information to be obtained in asimple and straightforward manner.The aims of this work were to investigate the thermal behaviour of agricultural andforestry waste during the pyrolysis process, to develop a kinetic model for theselignocellulosic materials (sorghum, rice husk, pine sawdust), to study the influence ofimpurities and catalyst content, size of feedstock particles and operating conditions on theprocess characteristics and the kinetic parameters. In this work thermogravimetric analysiscarried out both in dynamic mode at the constant heating rate between 3 and 72 o C/min and inisothermal mode at the various temperatures kept constant between 240 and 310 o C. In both121