MODELLING OF THE PYROLYSIS OF LIGNOCELLULOSIC MATERIALS
Abstract
THE PYROLYSIS OF VARIOUS LIGNOCELLULOSIC MATERIALS WAS STUDIED IN ORDER TO MODELIZE THE KINETICS OF BOTH PRIMARY AND SECONDARY REACTIONS AS ALSO TRANSPORT PHENOMENA. MODELLING WAS BASED ON EXPERIMENTAL DATA OBTAINED BY MEANS OF THERMAL ANALYSIS TECHNIQUES. THE MODEL OF INTERMEDIATE STEP COMPOSITION IS CORRELATED TOTHE PYROLYSIS RATE BY MEANS OF A SIMPLE ADDITIVE MODEL. USING BOTH THE ADDITIVE MODEL AND THE MODEL OF INTERMEDIATE STEP IT IS POSSIBLE TO PREDICT THE PYROLYSIS RATE OF DIFFERENT LIGNOCELLULOSIC MATERIAL UNDER DIFFERENT HEATING CONDITIONS. A MODEL INVOLVING ALSO THE SECONDARY INTERACTIONS BETWEEN CHARCOAL AND VOLATILES WAS SUGGESTED. THE TRANSPORT PHENOMENA AND THE CHEMICAL REACTIONS ARE DESCRIBED BY MEANS OF A GENERAL MODEL INVOLVING THE HEAT TRANSMISSION BALANCE IN APYROLYZING SOLID PARTICLE AND THE EQUATION OF PYROLYSIS RATE. THE HEAT BALANCEINCLUDES A TERM, WHICH REPRESENTS THE HEAT FLOW DUE TO REACTION HEAT. THE HEATOF THE PYROLYSIS REACTIONS CAN BE REPRESENTED BY TWO VA ...
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